2024-05-09 16:29:03 +02:00
16 changed files with 338 additions and 1704 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -413,7 +413,9 @@ dependencies = [
 "axum-client-ip",
 "caesar-core",
 "clap 4.5.4",
- "dotenv",
+ "confy",
 "dotenvy",
 "lazy_static",
 "serde",
 "serde_json",
 "tokio",
@ -460,6 +462,20 @@ dependencies = [
 "uuid",
 ]
 [[package]]
 name = "caesar-desktop"
 version = "0.0.1"
 dependencies = [
 "caesar-core",
 ]
 [[package]]
 name = "caesar-mobile"
 version = "0.0.1"
 dependencies = [
 "caesar-core",
 ]
 [[package]]
 name = "caesar-transfer-iu"
 version = "0.3.1"
@ -471,6 +487,13 @@ dependencies = [
 "shuttle-runtime",
 ]
 [[package]]
 name = "caesar-tui"
 version = "0.0.1"
 dependencies = [
 "caesar-core",
 ]
 [[package]]
 name = "cc"
 version = "1.0.96"
@ -522,11 +545,26 @@ dependencies = [
 "atty",
 "bitflags 1.3.2",
 "strsim 0.8.0",
- "textwrap",
+ "textwrap 0.11.0",
 "unicode-width",
 "vec_map",
 ]
 [[package]]
 name = "clap"
 version = "3.2.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
 dependencies = [
 "atty",
 "bitflags 1.3.2",
 "clap_lex 0.2.4",
 "indexmap 1.9.3",
 "strsim 0.10.0",
 "termcolor",
 "textwrap 0.16.1",
 ]
 [[package]]
 name = "clap"
 version = "4.5.4"
@ -545,7 +583,7 @@ checksum = "ae129e2e766ae0ec03484e609954119f123cc1fe650337e155d03b022f24f7b4"
 dependencies = [
 "anstream",
 "anstyle",
- "clap_lex",
+ "clap_lex 0.7.0",
 "strsim 0.11.1",
 ]
@ -561,6 +599,15 @@ dependencies = [
 "syn 2.0.60",
 ]
 [[package]]
 name = "clap_lex"
 version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
 dependencies = [
 "os_str_bytes",
 ]
 [[package]]
 name = "clap_lex"
 version = "0.7.0"
@ -595,6 +642,18 @@ dependencies = [
 "unicode-width",
 ]
 [[package]]
 name = "confy"
 version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "45b1f4c00870f07dc34adcac82bb6a72cc5aabca8536ba1797e01df51d2ce9a0"
 dependencies = [
 "directories",
 "serde",
 "thiserror",
 "toml",
 ]
 [[package]]
 name = "const-oid"
 version = "0.9.6"
@ -759,6 +818,27 @@ dependencies = [
 "subtle",
 ]
 [[package]]
 name = "directories"
 version = "5.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a49173b84e034382284f27f1af4dcbbd231ffa358c0fe316541a7337f376a35"
 dependencies = [
 "dirs-sys",
 ]
 [[package]]
 name = "dirs-sys"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
 dependencies = [
 "libc",
 "option-ext",
 "redox_users",
 "windows-sys 0.48.0",
 ]
 [[package]]
 name = "dotenv"
 version = "0.15.0"
@ -768,6 +848,15 @@ dependencies = [
 "clap 2.34.0",
 ]
 [[package]]
 name = "dotenvy"
 version = "0.15.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
 dependencies = [
 "clap 3.2.25",
 ]
 [[package]]
 name = "ecdsa"
 version = "0.16.9"
@ -1439,6 +1528,16 @@ version = "0.2.154"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
 [[package]]
 name = "libredox"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0ff37bd590ca25063e35af745c343cb7a0271906fb7b37e4813e8f79f00268d"
 dependencies = [
 "bitflags 2.5.0",
 "libc",
 ]
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.13"
@ -1737,6 +1836,12 @@ dependencies = [
 "thiserror",
 ]
 [[package]]
 name = "option-ext"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 [[package]]
 name = "ordered-float"
 version = "4.2.0"
@ -1746,6 +1851,12 @@ dependencies = [
 "num-traits",
 ]
 [[package]]
 name = "os_str_bytes"
 version = "6.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2355d85b9a3786f481747ced0e0ff2ba35213a1f9bd406ed906554d7af805a1"
 [[package]]
 name = "overload"
 version = "0.1.1"
@ -2050,6 +2161,17 @@ dependencies = [
 "bitflags 2.5.0",
 ]
 [[package]]
 name = "redox_users"
 version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd283d9651eeda4b2a83a43c1c91b266c40fd76ecd39a50a8c630ae69dc72891"
 dependencies = [
 "getrandom",
 "libredox",
 "thiserror",
 ]
 [[package]]
 name = "regex"
 version = "1.10.4"
@ -2346,6 +2468,15 @@ dependencies = [
 "serde",
 ]
 [[package]]
 name = "serde_spanned"
 version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb3622f419d1296904700073ea6cc23ad690adbd66f13ea683df73298736f0c1"
 dependencies = [
 "serde",
 ]
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.1"
@ -2583,6 +2714,12 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 [[package]]
 name = "strsim"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 [[package]]
 name = "strsim"
 version = "0.11.1"
@ -2703,6 +2840,15 @@ dependencies = [
 "windows-sys 0.52.0",
 ]
 [[package]]
 name = "termcolor"
 version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
 dependencies = [
 "winapi-util",
 ]
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@ -2712,6 +2858,12 @@ dependencies = [
 "unicode-width",
 ]
 [[package]]
 name = "textwrap"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23d434d3f8967a09480fb04132ebe0a3e088c173e6d0ee7897abbdf4eab0f8b9"
 [[package]]
 name = "thiserror"
 version = "1.0.59"
@ -2858,6 +3010,40 @@ dependencies = [
 "tokio",
 ]
 [[package]]
 name = "toml"
 version = "0.8.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e9dd1545e8208b4a5af1aa9bbd0b4cf7e9ea08fabc5d0a5c67fcaafa17433aa3"
 dependencies = [
 "serde",
 "serde_spanned",
 "toml_datetime",
 "toml_edit",
 ]
 [[package]]
 name = "toml_datetime"
 version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3550f4e9685620ac18a50ed434eb3aec30db8ba93b0287467bca5826ea25baf1"
 dependencies = [
 "serde",
 ]
 [[package]]
 name = "toml_edit"
 version = "0.22.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3328d4f68a705b2a4498da1d580585d39a6510f98318a2cec3018a7ec61ddef"
 dependencies = [
 "indexmap 2.2.6",
 "serde",
 "serde_spanned",
 "toml_datetime",
 "winnow",
 ]
 [[package]]
 name = "tonic"
 version = "0.10.2"
@ -3310,6 +3496,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 [[package]]
 name = "winapi-util"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d4cc384e1e73b93bafa6fb4f1df8c41695c8a91cf9c4c64358067d15a7b6c6b"
 dependencies = [
 "windows-sys 0.52.0",
 ]
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
@ -3464,6 +3659,15 @@ version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
 [[package]]
 name = "winnow"
 version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3c52e9c97a68071b23e836c9380edae937f17b9c4667bd021973efc689f618d"
 dependencies = [
 "memchr",
 ]
 [[package]]
 name = "winreg"
 version = "0.52.0"
--- a/caesar-cli/Cargo.toml
+++ b/caesar-cli/Cargo.toml
@ -17,7 +17,9 @@ serde_json = { version = "1.0" }
 serde = { version = "1.0", features = ["derive"] }
 tracing = "0.1.40"
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 dotenv = { version = "0.15.0", features = ["clap", "cli"] }
 clap = { version = "4.5.4", features = ["derive"] }
 axum = { version = "0.7.5", features = ["ws"] }
 axum-client-ip = "0.6.0"
 confy = "0.6.1"
 dotenvy = { version = "0.15.7", features = ["clap", "cli"] }
 lazy_static = "1.4.0"
--- a/caesar-cli/src/cli/args.rs
+++ b/caesar-cli/src/cli/args.rs
@ -5,40 +5,12 @@ use clap::{Parser, Subcommand};
 use std::{env, sync::Arc};
 use tracing::debug;
-/// This struct defines the CLI arguments and subcommands for the caesar command line application.
+use crate::config::GLOBAL_CONFIG;
-///
+
 /// The #[derive(Parser, Debug)] macro generates code that:
 ///  - parses the command line arguments using the clap library
 ///  - provides a Debug implementation for the struct
 ///
 /// The #[command(version, about, long_about = None)] macro generates code that:
 ///  - defines the version and about strings for the application
 ///  - specifies that there is no long about help text
 ///
 /// The #[command(subcommand)] macro generates code that:
 ///  - defines a subcommand for the caesar command line application.
 ///    Subcommands are used to break up a large number of options into
 ///    smaller, more manageable groups.
 ///
 /// The #[command] macro is used to annotate the `command` field of the struct.
 /// The `command` field is an Option<Commands> type, which means that the
 /// subcommand is optional.
 /// If the subcommand is not provided, the program will exit with a status code
 /// of 0 and without printing any output.
 ///
 /// The Commands enum defines the possible subcommands for the caesar command
 /// line application.
 /// See the Commands enum definition for more information about the available
 /// subcommands.
 #[derive(Parser, Debug)]
 #[command(version = env!("CARGO_PKG_VERSION"), about = "Send and receive files securely")]
 #[command(long_about = None)]
 pub struct Args {
    /// The subcommand for the caesar command line application.
    /// Subcommands are used to break up a large number of options into smaller,
    /// more manageable groups.
    /// If no subcommand is provided, the program will exit with a status code
    /// of 0 and without printing any output.
    #[command(subcommand)]
    pub command: Option<Commands>,
 }
@ -80,116 +52,47 @@ pub enum Commands {
 }
 impl Default for Args {
    // This function is called by the Default trait when no value is
    // provided for a field of type Args. It returns an instance of
    // Args that has been created by calling the new() function.
    //
    // The Default trait is used by various parts of the program to
    // provide a sensible default value for a field when no value is
    // provided. For example, the clap crate uses the Default trait when
    // parsing command line arguments to provide a default value for
    // a field.
    //
    // The new() function is a constructor function for Args that
    // creates an instance of Args with default field values.
    fn default() -> Self {
        Self::new()
    }
 }
 impl Args {
    /// Creates a new instance of Args by parsing command line arguments
    ///
    /// This function is a constructor for Args. It uses the clap crate to parse
    /// command line arguments and creates an instance of Args with the values
    /// provided by the user.
    ///
    /// The clap crate is a command line argument parser that is well tested and
    /// widely used. It provides a simple way to define command line
    /// arguments and generate helpful documentation for the user.
    ///
    /// The `parse()` function is used to parse the command line arguments and
    /// return an instance of Args.
    pub fn new() -> Self {
        Self::parse()
    }
    /// Runs the command specified by the user
    ///
    /// This function is called after the command line arguments have been
    /// parsed. It matches on the `command` field of the Args struct to determine
    /// what command the user wants to run.
    ///
    /// The match statement checks the value of `command` and calls the
    /// appropriate function to run the command. The functions that are called
    /// are located in other modules of the program.
    ///
    /// The `run()` function is called by the `main()` function of the program.
    /// The program's entry point is the `main()` function, which parses the
    /// command line arguments and then calls `run()` on the resulting Args
    /// instance.
    ///
    /// The `run()` function returns a Result. The error type is `Box<dyn
    /// std::error::Error + Send + Sync>`. This means that the error type is a
    /// trait object that represents an error that can be sent across threads
    /// and sent over a network connection. The `Send` and `Sync` traits are part
    /// of the standard library and are used to indicate that the error type can
    /// be sent across threads and sent over a network connection.
    ///
    /// The `run()` function does not return anything if the command is `None`.
    /// This is because `command` is an `Option<Commands>`. If the user does
    /// not specify a command, then `command` is `None`. In this case, there is
    /// nothing to run, so `run()` returns early with no error.
    pub async fn run(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        let cfg = &GLOBAL_CONFIG;
        debug!("args: {:#?}", self);
        match &self.command {
            // If the user wants to send files, call `start_sender()` in the
            // `sender` module with the list of files that the user wants to
            // send.
            Some(Commands::Send { relay, files }) => {
-                let relay_string: String = relay
+                let relay_string: String = relay.as_deref().unwrap_or(&cfg.app_origin).to_string();
                    .as_deref()
                    .unwrap_or(
                        &env::var("APP_ORIGIN")
                            .unwrap_or("wss://caesar-transfer-iu.shuttleapp.rs/ws".to_string()),
                    )
                    .to_string();
                let relay_arc = Arc::new(relay_string);
                let files_arc = Arc::new(files.to_vec());
                sender::start_sender(relay_arc, files_arc).await;
            }
            // If the user wants to receive files, call `start_receiver()` in the
            // `receiver` module with the name of the transfer that the user
            // wants to download.
            Some(Commands::Receive {
                relay,
                overwrite: _,
                name,
            }) => {
                println!("Receive for {name:?}");
-                receiver::start_receiver(
+                receiver::start_receiver(relay.as_deref().unwrap_or(&cfg.app_origin), name).await;
                    relay.as_deref().unwrap_or(
                        env::var("APP_ORIGIN")
                            .unwrap_or("ws://0.0.0.0:8000/ws".to_string())
                            .as_str(),
                    ),
                    name,
                )
                .await;
            }
            // If the user wants to start a relay server, call `start_ws()` in the
            // `relay` module with the port and listen address that the user
            // specified.
            Some(Commands::Serve {
                port,
                listen_address,
            }) => {
                println!("Serve with address '{listen_address:?}' and '{port:?}'");
-                relay::server::start_ws(port.as_ref(), listen_address.as_ref()).await;
+                let address: String = listen_address
                    .as_deref()
                    .unwrap_or(&cfg.app_host)
                    .to_string();
                let port_value = port.unwrap_or(cfg.app_port.parse::<i32>().unwrap_or(0));
                let port: i32 = port_value;
                relay::server::start_ws(&port, &address).await;
            }
            // If the user does not specify a command, return early with no error.
            // This is because `command` is an `Option<Commands>`. If the user does
            // not specify a command, then `command` is `None`.
            None => {}
        }
        Ok(())
--- a/caesar-cli/src/config.rs
+++ b/caesar-cli/src/config.rs
@ -0,0 +1,33 @@
 use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
 pub struct CaesarConfig {
    pub app_environment: String,
    pub app_host: String,
    pub app_port: String,
    pub app_origin: String,
    pub app_relay: String,
    pub rust_log: String,
 }
 impl Default for CaesarConfig {
    fn default() -> Self {
        CaesarConfig {
            app_environment: "production".to_string(),
            app_host: "0.0.0.0".to_string(),
            app_port: "8000".to_string(),
            app_origin: "wss://caesar-transfer-iu.shuttleapp.rs".to_string(),
            app_relay: "0.0.0.0:8000".to_string(),
            rust_log: "info".to_string(),
        }
    }
 }
 lazy_static! {
    pub static ref GLOBAL_CONFIG: CaesarConfig = {
        let cfg: CaesarConfig =
            confy::load("caesar", "caesar").expect("could not find config file");
        cfg
    };
 }
--- a/caesar-cli/src/main.rs
+++ b/caesar-cli/src/main.rs
@ -1,33 +1,20 @@
 use crate::cli::args::Args;
-use dotenv::dotenv;
+use dotenvy::dotenv;
 use tracing::error;
 use tracing_subscriber::filter::EnvFilter;
 mod cli;
 mod config;
 #[tokio::main]
 // This is the entrypoint of caesar.
 // The #[tokio::main] attribute is required for any async code, and it
 // sets up the tokio runtime.
 // The async fn main() is the entrypoint of the application, and it's where
 // we kick off our program.
 async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    // Load environment variables from a .env file if one is present.
    dotenv().ok();
    // Set up our logging subscriber.
    // TheEnvFilter::from_default_env reads the env variable RUST_LOG
    // and sets up the logging accordingly.
    // The default is INFO level logging.
    tracing_subscriber::fmt()
        .with_env_filter(EnvFilter::from_default_env())
        .init();
    // Parse the command line arguments.
    let args = Args::new();
    // Run the commands based on the parsed arguments.
    // If there is an error, print it to the console with the error! macro.
    if let Err(e) = args.run().await {
        error!("{e}");
    }
    // Return an Ok result, which just means that our program exited successfully.
    Ok(())
 }
--- a/caesar-core/src/receiver/client.rs
+++ b/caesar-core/src/receiver/client.rs
@ -22,21 +22,6 @@ use tracing::error;
 const DESTINATION: u8 = 0;
 const NONCE_SIZE: usize = 12;
 /// This struct represents a file that is being received.
 ///
 /// The struct contains information about the file, such as its name, size,
 /// and the handle of the file on the disk.
 ///
 /// The `name` field contains the name of the file, which is the name of the
 /// file on the disk.
 ///
 /// The `size` field contains the size of the file in bytes.
 ///
 /// The `progress` field contains the number of bytes that have already been
 /// received for the file.
 ///
 /// The `handle` field contains a handle to the file on the disk, which is
 /// used to read the contents of the file.
 struct File {
    name: String,
    size: u64,
@ -44,224 +29,58 @@ struct File {
    handle: fs::File,
 }
 /// This struct contains the context for the receiver.
 ///
 /// This structure is used to keep track of the state of the receiver, and to
 /// pass information between functions.
 struct Context {
    /// The HMAC key that is used to verify that the packets that are received
    /// are authentic.
    ///
    /// The HMAC key is generated by the sender, and is used to verify that the
    /// packets that are received are authentic. If the HMAC of a packet does
    /// not match the expected HMAC, then the packet is not processed.
    hmac: Vec<u8>,
    /// The sender that is used to send packets to the server.
    ///
    /// The sender is used to send packets to the server. The sender is also
    /// used to receive packets from the server.
    sender: Sender,
    /// The ephemeral secret key that is used for key exchange with the sender.
    ///
    /// The ephemeral secret key is generated by the receiver, and is used to
    /// exchange a shared key with the sender. The shared key is used to
    /// encrypt and decrypt packets.
    key: EphemeralSecret,
    /// The shared key that is used to encrypt and decrypt packets.
    ///
    /// The shared key is established between the receiver and the sender during
    /// the key exchange. The shared key is used to encrypt and decrypt packets
    /// between the receiver and the sender. If the shared key is `None`, then the
    /// packets that are received are not processed.
    shared_key: Option<Aes128Gcm>,
    /// The files that are being received.
    ///
    /// The files vector contains a list of all the files that are being
    /// received. Each file is represented by a `File` struct. The `name` field
    /// of the `File` struct contains the name of the file, which is the name of
    /// the file on the disk. The `size` field of the `File` struct contains the
    /// size of the file in bytes. The `progress` field of the `File` struct
    /// contains the number of bytes that have already been received for the
    /// file. The `handle` field of the `File` struct contains a handle to the
    /// file on the disk, which is used to read the contents of the file.
    files: Vec<File>,
    /// The sequence number of the next chunk that is expected to be received.
    ///
    /// The sequence number is used to keep track of the sequence of chunks that
    /// are received. If a chunk does not have the expected sequence number,
    /// then the chunk is not processed.
    sequence: u32,
    /// The index of the file that is currently being received.
    ///
    /// The index is used to keep track of which file is currently being
    /// received. The index is incremented after a file is completely received.
    index: usize,
    /// The progress of the current file that is being received.
    ///
    /// The progress is used to keep track of the progress of the current file
    /// that is being received. The progress is calculated by dividing the
    /// number of bytes that have been received by the size of the file. The
    /// progress is sent to the server so that the sender knows how much of the
    /// file has been received.
    progress: u64,
    /// The total length of the current file that is being received.
    ///
    /// The length is used to keep track of the total length of the current file
    /// that is being received. The length is used to calculate the progress of
    /// the file.
    length: u64,
 }
 /// This function is called when the receiver receives a join room packet from
 /// the server. The packet contains the size of the list of files that the
 /// sender is going to send.
 ///
 /// If the packet does not contain the size of the list, then an error is
 /// returned.
 ///
 /// If the packet does contain the size of the list, then a message is printed
 /// to the console indicating that the receiver has connected to the room.
 ///
 /// The function does not do anything else. It returns a `Status::Continue`
 /// variant to indicate that the event loop should continue processing events.
 fn on_join_room(size: Option<usize>) -> Status {
    // If the packet does not contain the size of the list, then return an error.
    if size.is_none() {
        return Status::Err("Invalid join room packet.".into());
    }
    // If the packet contains the size of the list, then print a message to the
    // console indicating that the receiver has connected to the room.
    println!("Connected to room.");
    // Return a `Status::Continue` variant to indicate that the event loop
    // should continue processing events.
    Status::Continue()
 }
 /// This function is called when the event loop receives an error packet from
 /// the server. The packet contains a message with a description of the error.
 ///
 /// When an error occurs, the server sends an error packet to the client. The
 /// error packet contains a message with a description of the error. This
 /// function extracts that message and creates a `Status::Err` variant with it,
 /// which is then returned to be handled by the main event loop.
 ///
 /// When the event loop receives a status variant that is an error, it exits
 /// with an error message containing the message from the error packet.
 ///
 /// The message from the error packet is the only information that the event
 /// loop has about the error, so the message should be descriptive and
 /// helpful to the user. The message should not contain technical details
 /// about the error or how it occurred. Instead, the message should be
 /// written from the perspective of the user and should give the user enough
 /// information to understand what went wrong and how they might be able to
 /// fix the problem.
 ///
 /// This function takes the message from the error packet and creates a
 /// `Status::Err` variant with it. The function returns this variant to be
 /// handled by the main event loop.
 fn on_error(message: String) -> Status {
    Status::Err(message)
 }
 /// This function is called when the event loop receives a leave room packet from
 /// the server. The packet contains the index of the file that was being
 /// transferred when the receiver left the room.
 ///
 /// When the receiver receives a leave room packet, it means that the sender
 /// has disconnected from the room. In this case, the receiver should check if
 /// there are any files that were being transferred but not yet complete. If
 /// there are any incomplete files, the receiver should print a message to
 /// the user indicating that the transfer was interrupted.
 ///
 /// If there are no incomplete files, then the receiver should exit
 /// normally. The `Status::Exit` variant is returned to the main event loop,
 /// which will cause the event loop to exit normally.
 ///
 /// This function checks if there are any incomplete files by iterating over
 /// the list of files in the context. If there are any files with a progress
 /// less than 100%, then the function prints a message to the user and returns
 /// an error status.
 ///
 /// If there are no incomplete files, then the function simply returns a
 /// `Status::Exit` variant. This will cause the main event loop to exit
 /// normally.
 fn on_leave_room(context: &mut Context, _: usize) -> Status {
    // Check if there are any incomplete files.
    if context.files.iter().any(|file| file.progress < 100) {
        // If there are any incomplete files, print a message to the user.
        println!();
        println!("Transfer was interrupted because the host left the room.");
        // Return an error status.
        Status::Err("Transfer was interrupted because the host left the room.".into())
    } else {
        // If there are no incomplete files, return a `Status::Exit` variant.
        // This will cause the event loop to exit normally.
        Status::Exit()
    }
 }
 /// This function is called when the event loop receives a list packet from
 /// the server. The packet contains a list of files to be transferred.
 ///
 /// When this function is called, we know that the sender has successfully
 /// established a shared key with the receiver. Therefore, we can start
 /// receiving encrypted files.
 ///
 /// This function iterates over the list of files in the packet and creates a
 /// file on disk for each file in the list. If a file with the same name already
 /// exists, an error is returned and the event loop is exited with an error
 /// message. This is because the receiver should not overwrite existing files
 /// without the user's explicit permission.
 ///
 /// Once all the files have been created, the function initializes the context
 /// variables for the event loop. `index` is set to 0 to indicate that we are
 /// currently transferring the first file. `progress` is set to 0 to indicate
 /// that the progress of the first file is 0%. `sequence` is set to 0 to
 /// indicate that the first chunk of data we receive will have a sequence
 /// number of 0. `length` is set to 0 to indicate that we have not received
 /// any data yet.
 ///
 /// If there is an error creating any of the files, the function returns an
 /// error status. This will cause the event loop to exit with an error message.
 ///
 /// If there are no errors, the function returns a `Status::Continue()` variant.
 /// This will cause the event loop to continue running and wait for more
 /// packets from the sender.
 fn on_list(context: &mut Context, list: ListPacket) -> Status {
    if context.shared_key.is_none() {
        return Status::Err("Invalid list packet: no shared key established".into());
    }
    // Iterate over the list of files in the packet.
    for entry in list.entries {
        // Sanitize the file name to remove any characters that are not valid in
        // file names on the current platform.
        let path = sanitize_filename::sanitize(entry.name.clone());
        // Check if a file with the same name already exists.
        if Path::new(&path).exists() {
            // If the file already exists, return an error and exit the event loop
            // with an error message.
            return Status::Err(format!("The file '{}' already exists.", path));
        }
        // Try to create a new file with the sanitized file name.
        let handle = match fs::File::create(&path) {
            Ok(handle) => handle,
            Err(error) => {
                // If there is an error creating the file, return an error and
                // exit the event loop with an error message.
                return Status::Err(format!(
                    "Error: Failed to create file '{}': {}",
                    path, error
@ -269,7 +88,6 @@ fn on_list(context: &mut Context, list: ListPacket) -> Status {
            }
        };
        // Create a new file struct for the file we just created.
        let file = File {
            name: entry.name,
            size: entry.size,
@ -277,55 +95,22 @@ fn on_list(context: &mut Context, list: ListPacket) -> Status {
            progress: 0,
        };
        // Add the new file to the list of files in the context.
        context.files.push(file);
    }
    // Set the context variables for the event loop.
    context.index = 0;
    context.progress = 0;
    context.sequence = 0;
    context.length = 0;
    // Return a `Status::Continue()` variant to indicate that the event loop
    // should continue running and wait for more packets from the sender.
    Status::Continue()
 }
 /// This function handles a chunk packet received from the sender.
 ///
 /// It checks that the shared key has been established, that the sequence number
 /// of the chunk matches the expected sequence number in the context, and that
 /// the index of the file in the context is valid.
 ///
 /// If any of these checks fail, an error is returned and the event loop is
 /// stopped.
 ///
 /// The function updates the length of the file, increments the sequence number
 /// in the context, and writes the contents of the chunk to the file.
 ///
 /// The progress of the file is updated to be the ratio of the number of bytes
 /// read so far to the total size of the file.
 ///
 /// If the progress of the file is 100%, or if the difference in progress between
 /// this chunk and the last chunk is greater than or equal to 1, or if this is the
 /// first chunk, a ProgressPacket is sent to the sender with the index of the file
 /// in the context and the progress of the file.
 ///
 /// If the size of the file has been reached, the index of the current file is
 /// incremented, the length of the current file is set to 0, the progress of the
 /// current file is set to 0, and the sequence number is set to 0.
 ///
 /// Finally, a Status::Continue() variant is returned to indicate that the event
 /// loop should continue running and wait for more packets from the sender.
 fn on_chunk(context: &mut Context, chunk: ChunkPacket) -> Status {
    // Check that the shared key has been established.
    if context.shared_key.is_none() {
        return Status::Err("Invalid chunk packet: no shared key established".into());
    }
    // Check that the sequence number of the chunk matches the expected sequence
    // number in the context.
    if chunk.sequence != context.sequence {
        return Status::Err(format!(
            "Expected sequence {}, but got {}.",
@ -333,40 +118,26 @@ fn on_chunk(context: &mut Context, chunk: ChunkPacket) -> Status {
        ));
    }
    // Get a mutable reference to the file in the context at the index of the
    // file.
    let Some(file) = context.files.get_mut(context.index) else {
        // If the index of the file in the context is invalid, return an error and
        // stop the event loop.
        return Status::Err("Invalid file index.".into());
    };
    // Update the length of the file.
    context.length += chunk.chunk.len() as u64;
    // Increment the sequence number in the context.
    context.sequence += 1;
    // Write the contents of the chunk to the file.
    file.handle.write(&chunk.chunk).unwrap();
    // Update the progress of the file.
    file.progress = (context.length * 100) / file.size;
    // If the progress of the file is 100%, or if the difference in progress between
    // this chunk and the last chunk is greater than or equal to 1, or if this is the
    // first chunk, send a ProgressPacket to the sender.
    if file.progress == 100 || file.progress - context.progress >= 1 || chunk.sequence == 0 {
        context.progress = file.progress;
        let progress = ProgressPacket {
            // Convert the index of the file in the context to a u32.
            index: context.index.try_into().unwrap(),
            // Convert the progress of the file to a u32.
            progress: context.progress.try_into().unwrap(),
        };
        // Send the ProgressPacket to the sender.
        context.sender.send_encrypted_packet(
            &context.shared_key,
            DESTINATION,
@ -377,9 +148,6 @@ fn on_chunk(context: &mut Context, chunk: ChunkPacket) -> Status {
        std::io::Write::flush(&mut stdout()).unwrap();
    }
    // If the size of the file has been reached, increment the index of the
    // current file, set the length of the current file to 0, set the progress
    // of the current file to 0, and resets the sequence number to 0.
    if file.size == context.length {
        context.index += 1;
        context.length = 0;
@ -389,65 +157,39 @@ fn on_chunk(context: &mut Context, chunk: ChunkPacket) -> Status {
        println!();
    }
    // Return a Status::Continue() variant to indicate that the event loop should
    // continue running and wait for more packets from the sender.
    Status::Continue()
 }
 /// This function is called when the Receiver receives a HandshakePacket from the
 /// Sender. It verifies the signature of the Sender's public key and generates its own
 /// public key. It then generates a shared secret key between the Receiver and the Sender
 /// using the Diffie-Hellman key exchange.
 ///
 /// The Receiver sends back a HandshakeResponsePacket to the Sender with its own public
 /// key and a signature created using the shared secret key and its own private key.
 ///
 /// The shared secret key is used to encrypt packets sent between the Receiver and the
 /// Sender.
 fn on_handshake(context: &mut Context, handshake: HandshakePacket) -> Status {
    // If a shared key has already been established, this means that the Receiver
    // has already performed the handshake, so return an error.
    if context.shared_key.is_some() {
        return Status::Err("Already performed handshake.".into());
    }
    // Create a new HMAC using the hmac from the Context struct as the key.
    let mut mac = Hmac::<Sha256>::new_from_slice(&context.hmac).unwrap();
    // Update the HMAC with the public key from the HandshakePacket.
    mac.update(&handshake.public_key);
    // Call verify_slice() on the HMAC to verify the signature from the Sender.
    // If the signature is invalid, return an error.
    let verification = mac.verify_slice(&handshake.signature);
    if verification.is_err() {
        return Status::Err("Invalid signature from the sender.".into());
    }
    // Generate the Receiver's public key from the private key.
    let public_key = context.key.public_key().to_sec1_bytes().into_vec();
    // Create a new HMAC using the hmac from the Context struct as the key.
    let mut mac = Hmac::<Sha256>::new_from_slice(&context.hmac).unwrap();
    // Update the HMAC with the public key of the Receiver.
    mac.update(&public_key);
    // Serialize the resulting HMAC into a byte array and use it as the
    // signature in the HandshakeResponsePacket.
    let signature = mac.finalize().into_bytes().to_vec();
    // Create a new shared secret key between the Receiver and the Sender.
    let shared_public_key = PublicKey::from_sec1_bytes(&handshake.public_key).unwrap();
    let shared_secret = context.key.diffie_hellman(&shared_public_key);
    let shared_secret = shared_secret.raw_secret_bytes();
    let shared_secret = &shared_secret[0..16];
    // Create a new Aes128Gcm key from the shared secret.
    let shared_key: &Key<Aes128Gcm> = shared_secret.into();
    let shared_key = <Aes128Gcm as aes_gcm::KeyInit>::new(shared_key);
    // Create the HandshakeResponsePacket and send it to the Sender.
    let handshake_response = HandshakeResponsePacket {
        public_key,
        signature,
@ -457,81 +199,55 @@ fn on_handshake(context: &mut Context, handshake: HandshakePacket) -> Status {
        .sender
        .send_packet(DESTINATION, Value::HandshakeResponse(handshake_response));
    // Store the shared key in the Context struct.
    context.shared_key = Some(shared_key);
    // Return a Status::Continue() variant to indicate that the event loop should
    // continue running and wait for more packets from the Sender.
    Status::Continue()
 }
 /// This function is called when a message is received from the Sender.
 ///
 /// The message can be either text or binary. If it's text, we attempt to
 /// parse it as a JsonPacketResponse and match on the type of response it is.
 /// If it's binary, we attempt to decrypt it using the shared key (if it
 /// exists) and then decode it into a Packet. We then match on the type of
 /// value in the Packet and call the appropriate function with the relevant
 /// data.
 ///
 /// If the message is not text or binary, we return a Status::Err with an
 /// appropriate error message.
 fn on_message(context: &mut Context, message: WebSocketMessage) -> Status {
-    if message.is_text() {
+    match message.clone() {
-        let text = message.into_text().unwrap();
+        WebSocketMessage::Text(text) => {
-        let packet = serde_json::from_str(&text).unwrap();
+            let packet = match serde_json::from_str(&text) {
                Ok(packet) => packet,
                Err(_) => {
                    return Status::Continue();
                }
            };
            return match packet {
                JsonPacketResponse::Join { size } => on_join_room(size),
                JsonPacketResponse::Leave { index } => on_leave_room(context, index),
                JsonPacketResponse::Error { message } => on_error(message),
                _ => Status::Err(format!("Unexpected json packet: {:?}", packet)),
            };
        }
        WebSocketMessage::Binary(data) => {
            let data = &data[1..];
-        return match packet {
+            let data = if let Some(shared_key) = &context.shared_key {
-            JsonPacketResponse::Join { size } => on_join_room(size),
+                let nonce = &data[..NONCE_SIZE];
-            JsonPacketResponse::Leave { index } => on_leave_room(context, index),
+                let ciphertext = &data[NONCE_SIZE..];
            JsonPacketResponse::Error { message } => on_error(message),
-            _ => Status::Err(format!("Unexpected json packet: {:?}", packet)),
+                shared_key.decrypt(nonce.into(), ciphertext).unwrap()
-        };
+            } else {
-    } else if message.is_binary() {
+                data.to_vec()
-        let data = message.into_data();
+            };
        let data = &data[1..];
-        let data = if let Some(shared_key) = &context.shared_key {
+            let packet = Packet::decode(data.as_ref()).unwrap();
-            let nonce = &data[..NONCE_SIZE];
+            let value = packet.value.unwrap();
-            let ciphertext = &data[NONCE_SIZE..];
+            return match value {
-
+                Value::List(list) => on_list(context, list),
-            shared_key.decrypt(nonce.into(), ciphertext).unwrap()
+                Value::Chunk(chunk) => on_chunk(context, chunk),
-        } else {
+                Value::Handshake(handshake) => on_handshake(context, handshake),
-            data.to_vec()
+                _ => Status::Err(format!("Unexpected packet: {:?}", value)),
-        };
+            };
-
+        }
-        let packet = Packet::decode(data.as_ref()).unwrap();
+        _ => (),
        let value = packet.value.unwrap();
        return match value {
            Value::List(list) => on_list(context, list),
            Value::Chunk(chunk) => on_chunk(context, chunk),
            Value::Handshake(handshake) => on_handshake(context, handshake),
            _ => Status::Err(format!("Unexpected packet: {:?}", value)),
        };
    }
    Status::Err("Invalid message type".into())
 }
 /// This function takes a websocket connection and an invite code,
 /// splits the connection into an outgoing and incoming part,
 /// creates a context for the connection, sends a join room packet,
 /// and starts two futures to handle incoming and outgoing messages.
 ///
 /// The outgoing future reads from a channel and sends the messages
 /// through the outgoing part of the connection. If the sending fails,
 /// the future will print an error and exit.
 ///
 /// The incoming future reads from the incoming part of the connection
 /// and passes the messages to the `on_message` function. If the message
 /// is an exit or an error, the function will print the error and exit.
 /// If the message is any other type of packet, it will be handled by the
 /// `on_message` function and the future will continue running.
 pub async fn start(socket: Socket, fragment: &str) {
    // Extract the room id and hmac from the invite code
    let Some(index) = fragment.rfind('-') else {
        println!("Error: The invite code '{}' is not valid.", fragment);
        return;
@ -544,16 +260,12 @@ pub async fn start(socket: Socket, fragment: &str) {
        return;
    };
    // Create a new ephemeral key pair
    let key = EphemeralSecret::random(&mut OsRng);
    // Create a channel for sending messages
    let (sender, receiver) = flume::bounded(1000);
    // Split the websocket connection into an outgoing and incoming part
    let (outgoing, incoming) = socket.split();
    // Create a new context for the connection
    let mut context = Context {
        hmac,
        sender,
@ -570,40 +282,32 @@ pub async fn start(socket: Socket, fragment: &str) {
    println!("Attempting to join room '{}'...", id);
    // Send a join room packet to the server
    context
        .sender
        .send_json_packet(JsonPacket::Join { id: id.to_string() });
    // Create futures for handling incoming and outgoing messages
    let outgoing_handler = receiver.stream().map(Ok).forward(outgoing);
    let incoming_handler = incoming.try_for_each(|message| {
        // Call the on_message function to handle the message
        match on_message(&mut context, message) {
            // If the message is an exit, print a message and exit
            Status::Exit() => {
                context.sender.send_json_packet(JsonPacket::Leave);
                println!("Transfer has completed.");
                return future::err(Error::ConnectionClosed);
            }
            // If the message is an error, print the error and exit
            Status::Err(error) => {
                println!("Error: {}", error);
                return future::err(Error::ConnectionClosed);
            }
            // If the message is any other type of packet, do nothing
            _ => {}
        };
        // Continue running the future
        future::ok(())
    });
    // Pin the futures to the stack so they can run concurrently
    pin_mut!(incoming_handler, outgoing_handler);
    // Wait for either future to complete
    future::select(incoming_handler, outgoing_handler).await;
 }
 #[cfg(test)]
--- a/caesar-core/src/receiver/mod.rs
+++ b/caesar-core/src/receiver/mod.rs
@ -1,40 +1,3 @@
 /// This module is the entry point for the receiver command.
 /// It contains a single function, `start_receiver`, which is the
 /// entry point for the receiver program.
 ///
 /// The `start_receiver` function takes a `String` which is the URL or
 /// invite code for the room that the receiver should join. If the
 /// URL is invalid or does not contain an invite code fragment,
 /// the function falls back to using the command line arguments to get
 /// the file paths to be sent.
 ///
 /// The `start_receiver` function first creates a request to connect
 /// to the WebSocket server with a specific origin. This is done to
 /// prevent cross-origin requests, which are not allowed by the
 /// WebSocket protocol.
 ///
 /// If creating the request succeeds, the function inserts the origin
 /// into the request headers. Then, it attempts to connect to the
 /// server using the `connect_async` function from the
 /// `tokio_tungstenite` crate.
 ///
 /// If the connection attempt succeeds, the function extracts the
 /// invite code fragment from the URL and passes it to the `start`
 /// function in the `receiver::client` module. The `start` function is
 /// defined in the `receiver::client` module and is the function that
 /// interacts with the server to receive files.
 ///
 /// If the connection attempt fails or the URL does not contain an
 /// invite code fragment, the function falls back to using the command
 /// line arguments to get the file paths to be sent. It then calls the
 /// `start` function in the `sender::client` module with the
 /// WebSocket stream and the file paths. The `start` function in the
 /// `sender::client` module is defined in the `sender::client`
 /// module and is the function that sends the files over the
 /// WebSocket connection.
 ///
 /// The `start` function takes ownership of the WebSocket stream and
 /// the file paths, so we pass them by value.
 pub mod client;
 pub mod http_client;
@ -65,13 +28,6 @@ pub async fn start_receiver(relay: &str, name: &str) {
        Ok(()) => debug!("Success"),
        Err(e) => error!("Error: {e:?}"),
    };
    // if let Err(e) = start_ws_com(res_ip.as_str(), res.local_room_id.as_str()).await {
    //     debug!("Failed to connect local with first room_id: {e}");
    //     if let Err(e) = start_ws_com(relay, res.relay_room_id.as_str()).await {
    //         debug!("Failed to connect remote with first room_id: {e}");
    //     }
    // }
 }
 pub async fn start_ws_com(relay: &str, name: &str) -> Result<(), Box<dyn std::error::Error>> {
@ -81,8 +37,6 @@ pub async fn start_ws_com(relay: &str, name: &str) -> Result<(), Box<dyn std::er
        return Err("Failed to create request".into());
    };
    // Insert the origin into the request headers to prevent
    // cross-origin requests.
    request
        .headers_mut()
        .insert("Origin", HeaderValue::from_str(relay).unwrap());
@ -105,9 +59,5 @@ pub async fn start_ws_com(relay: &str, name: &str) -> Result<(), Box<dyn std::er
            Err(Box::new(e))
        }?,
    };
    // The start function is defined in the
    // receiver::client module and is the function that interacts with
    // the server to receive files.
    // receiver::start(socket, name).await
    Ok(())
 }
--- a/caesar-core/src/relay/appstate.rs
+++ b/caesar-core/src/relay/appstate.rs
@ -4,11 +4,6 @@ use tokio::sync::RwLock;
 use crate::relay::room::Room;
 use crate::relay::transfer::TransferResponse;
 /// A struct that holds all of the rooms that the server knows about.
 ///
 /// The rooms are stored in a `HashMap` with the room ID as the key and the
 /// room as the value. This means that looking up a room by its ID is an O(1)
 /// operation, which is very fast.
 #[derive(Debug, Clone)]
 pub struct AppState {
    pub rooms: HashMap<String, Room>,
@ -16,35 +11,8 @@ pub struct AppState {
 }
 impl AppState {
    /// Creates a new `Server` with an empty list of rooms.
    ///
    /// The `rooms` field of the returned `Server` is an empty `HashMap`.
    /// This means that the server will not have any rooms when it is first
    /// created.
    ///
    /// This function returns an `Arc<RwLock<Server>>` because the server
    /// needs to be shared between different parts of the program. The
    /// `Arc` makes it so that the server can be shared by multiple threads,
    /// and the `RwLock` makes it so that the server can be read from and
    /// written to from multiple threads at the same time.
    ///
    /// The `Arc` and `RwLock` are both parts of the `tokio` library, which
    /// provides asynchronous programming tools for Rust.
    ///
    /// The `Arc` and `RwLock` are used together to create a Mutex-like
    /// object that can be shared between threads. The main difference
    /// between a Mutex and an `Arc<RwLock<T>>` is that a Mutex can only be
    /// locked by one thread at a time, while an `Arc<RwLock<T>>` can be
    /// locked by multiple threads at the same time.
    ///
    /// This function is used to create a new `Server` and share it between
    /// different parts of the program. The `Server` is shared because it
    /// needs to be able to handle connections from multiple clients at the
    /// same time.
    pub fn new() -> Arc<RwLock<AppState>> {
        // Create a new `Server` instance.
        Arc::new(RwLock::new(AppState {
            // Initialize the list of rooms to be empty.
            rooms: HashMap::new(),
            transfers: Vec::new(),
        }))
--- a/caesar-core/src/relay/client.rs
+++ b/caesar-core/src/relay/client.rs
@ -11,27 +11,6 @@ use crate::relay::ResponsePacket;
 use uuid::Uuid;
 type Sender = Arc<Mutex<SplitSink<axum::extract::ws::WebSocket, Message>>>;
 /// This struct represents a single client connection to the server.
 ///
 /// A `Client` instance holds a `Sender` and a `room_id`.
 ///
 /// The `Sender` is a type alias for a `tokio::sync::mpsc::Sender<Message>`.
 /// It is used to send messages to the client.
 ///
 /// The `room_id` is an `Option<String>`. It is used to keep track of which
 /// room the client is currently in. If the `room_id` is `None`, then the
 /// client is not in any room. If the `room_id` is `Some(id)`, where `id` is a
 /// `String`, then the client is in the room with the ID `id`.
 ///
 /// The `room_id` is used to keep track of which room the client is in so
 /// that the server knows which room to send messages to. When a client
 /// joins a room, their `room_id` is set to the ID of the room that they
 /// joined. When a client leaves a room, their `room_id` is set to `None`.
 ///
 /// The `Client` struct is used to keep track of which room each client is
 /// in. It is used by the `Server` to determine which room to send messages
 /// to.
 ///
 #[derive(Debug)]
 pub struct Client {
    sender: Sender,
@ -39,22 +18,6 @@ pub struct Client {
 }
 impl Client {
    /// Creates a new `Client` instance.
    ///
    /// The `sender` argument is a `Sender` for sending messages to the client.
    /// It is used by the `Server` to send messages to the client.
    ///
    /// The `room_id` field of the `Client` instance is set to `None` initially.
    /// This is because the client is not in any room when they first connect
    /// to the server.
    ///
    /// The `sender` field of the `Client` instance is used to send messages to
    /// the client. When the server wants to send a message to the client, it
    /// uses the `sender` to send the message.
    ///
    /// The `Client` instance is used by the `Server` to keep track of which
    /// room each client is in. It is used by the `Server` to determine which
    /// room to send messages to.
    pub fn new(sender: Sender) -> Client {
        Client {
            sender,
@ -62,21 +25,6 @@ impl Client {
        }
    }
    /// Sends a message to a client.
    ///
    /// This function takes a `sender` argument, which is a `Mutex` guard
    /// for a WebSocket connection. The `sender` is used to send a message
    /// to the client.
    ///
    /// The `message` argument is the message that is sent to the client. It
    /// is a WebSocket message.
    ///
    /// This function locks the `sender` Mutex to ensure that only one thread
    /// can send a message at a time. This is because the SplitSink that the
    /// `sender` mutex guards is not thread-safe, and sending a message from
    /// multiple threads could result in the messages being sent out of order.
    ///
    /// If sending the message fails, this function logs an error message.
    async fn send(&self, sender: Sender, message: Message) {
        let mut sender = sender.lock().await;
        if let Err(error) = sender.send(message).await {
@ -84,82 +32,21 @@ impl Client {
        }
    }
    /// Sends a packet to a client.
    ///
    /// This function takes a `sender` argument, which is a `Mutex` guard
    /// for a WebSocket connection. The `sender` is used to send a message
    /// to the client.
    ///
    /// The `packet` argument is the packet that is sent to the client. It
    /// is a struct that contains the data that is being sent.
    ///
    /// This function serializes the `packet` using serde_json and sends it
    /// to the client as a WebSocket Text message.
    ///
    /// This function locks the `sender` Mutex to ensure that only one thread
    /// can send a message at a time. This is because the SplitSink that the
    /// `sender` mutex guards is not thread-safe, and sending a message from
    /// multiple threads could result in the messages being sent out of order.
    async fn send_packet(&self, sender: Sender, packet: ResponsePacket) {
        let serialized_packet = serde_json::to_string(&packet).unwrap();
        self.send(sender, Message::Text(serialized_packet)).await;
    }
    /// Sends an error packet to a client.
    ///
    /// This function takes a `sender` argument, which is a `Mutex` guard
    /// for a WebSocket connection. The `sender` is used to send a message
    /// to the client.
    ///
    /// The `message` argument is the message that is sent to the client. It
    /// is a string that describes the error.
    ///
    /// This function creates an error packet with the `message` and sends it
    /// to the client using the `send_packet` function.
    ///
    /// This function locks the `sender` Mutex to ensure that only one thread
    /// can send a message at a time. This is because the SplitSink that the
    /// `sender` mutex guards is not thread-safe, and sending a message from
    /// multiple threads could result in the messages being sent out of order.
    async fn send_error_packet(&self, sender: Sender, message: String) {
        let error_packet = ResponsePacket::Error { message };
        self.send_packet(sender, error_packet).await
    }
    /// Handles a CreateRoom request from a client.
    ///
    /// This function is called when a client sends a CreateRoom request to
    /// the server. The server will create a new room with the specified
    /// size and return the room's identifier to the client.
    ///
    /// This function takes a `server` argument, which is a `RwLock`
    /// guard for the server's state. The `server` is used to check if the
    /// current client is already in a room, and to insert the new room into
    /// the server's state.
    ///
    /// If the current client is already in a room, this function returns
    /// without doing anything. This is to prevent a client from being in
    /// multiple rooms at the same time.
    ///
    /// If there is already a room with the same identifier as the one that
    /// is being created, this function sends an error packet to the client
    /// and returns.
    ///
    /// If there is no existing room with the same identifier, this function
    /// creates a new room with the specified size and inserts it into the
    /// server's state. It then sends a CreateRoom response packet to the
    /// client with the room's identifier.
    ///
    /// This function locks the `server` RwLock to ensure that only one
    /// thread can access the server's state at a time. This is because the
    /// server's state is not thread-safe, and accessing it from multiple
    /// threads could result in undefined behavior.
    async fn handle_create_room(&mut self, server: &RwLock<AppState>, id: Option<String>) {
        let mut server = server.write().await;
        // If the current client is already in a room, do nothing.
        if server.rooms.iter().any(|(_, room)| {
            room.senders
                .iter()
@ -168,15 +55,12 @@ impl Client {
            return;
        }
        // Generate a new room identifier.
        let size = Room::DEFAULT_ROOM_SIZE;
        let room_id = match id {
            Some(id) => id,
            None => Uuid::new_v4().to_string(),
        };
        // If there is already a room with the same identifier, send an error
        // packet to the client and return.
        if server.rooms.contains_key(&room_id) {
            drop(server);
@ -188,46 +72,23 @@ impl Client {
                .await;
        }
        // Create a new room with the specified size and insert it into the
        // server's state.
        let mut room = Room::new(size);
        room.senders.push(self.sender.clone());
        server.rooms.insert(room_id.clone(), room);
        // Set the client's room ID to the new room's identifier.
        self.room_id = Some(room_id.clone());
        drop(server);
        // Send a CreateRoom response packet to the client with the room's
        // identifier.
        debug!("Room created");
        self.send_packet(self.sender.clone(), ResponsePacket::Create { id: room_id })
            .await
    }
    /// This function is called when the client sends a JoinRoom packet.
    ///
    /// If the client is already in a room, then this function does nothing.
    ///
    /// If the client is not in a room, then the function checks if the room
    /// specified in the packet exists. If the room does not exist, an error
    /// packet is sent to the client with a message indicating that the room
    /// does not exist.
    ///
    /// If the room does exist, then the function checks if the room is full.
    /// If the room is full, an error packet is sent to the client with a
    /// message indicating that the room is full.
    ///
    /// If the room is not full, then the client is added to the room and the
    /// function sends a JoinRoom response packet to the client with the size
    /// of the room (excluding the client itself) and a `size` field set to
    /// `None`. The response packet is sent to all other clients in the room.
    async fn handle_join_room(&mut self, server: &RwLock<AppState>, room_id: String) {
        let mut server = server.write().await;
        // If the client is already in a room, do nothing.
        if server.rooms.iter().any(|(_, room)| {
            room.senders
                .iter()
@ -236,8 +97,6 @@ impl Client {
            return;
        }
        // Get a mutable reference to the room specified in the packet.
        // If the room does not exist, return an error to the client.
        let Some(room) = server.rooms.get_mut(&room_id) else {
            drop(server);
@ -246,7 +105,6 @@ impl Client {
                .await;
        };
        // If the room is full, return an error to the client.
        if room.senders.len() >= room.size {
            drop(server);
@ -255,16 +113,9 @@ impl Client {
                .await;
        }
        // Add the client to the room and set the client's room ID to the new
        // room's identifier.
        room.senders.push(self.sender.clone());
        self.room_id = Some(room_id);
        // Create a list of futures to send JoinRoom response packets to all
        // other clients in the room. The `size` field of the response packet is
        // set to `None` if the client sending the packet is the one joining the
        // room. Otherwise, the `size` field is set to the number of clients in
        // the room minus one (to exclude the client joining the room).
        let mut futures = vec![];
        for sender in &room.senders {
            if Arc::ptr_eq(sender, &self.sender) {
@ -283,120 +134,43 @@ impl Client {
        join_all(futures).await;
    }
    /// Handles a request to leave a room.
    ///
    /// This function is called when a client sends a `LeaveRoom` request
    /// packet. The function obtains a write lock on the server's state and
    /// does the following:
    ///
    /// 1. Gets the room ID of the client who sent the request. If the client is
    ///    not in a room, the function returns early.
    /// 2. Tries to get a mutable reference to the room with the obtained room
    ///    ID. If the room does not exist, the function returns early.
    /// 3. Finds the index of the client's sender in the room's list of senders.
    ///    If the client is not in the room, the function returns early.
    /// 4. Removes the client's sender from the room's list of senders.
    /// 5. Sets the client's room ID to `None`.
    /// 6. Creates a list of futures to send `LeaveRoom` response packets to
    ///    all other clients in the room. The `index` field of the response
    ///    packet is set to the index of the client's sender in the room's list
    ///    of senders.
    /// 7. If the room is now empty, removes the room from the server's list
    ///    of rooms.
    /// 8. Drops the write lock on the server's state.
    /// 9. Waits for all futures to complete.
    async fn handle_leave_room(&mut self, server: &RwLock<AppState>) {
        // Obtain a write lock on the server's state.
        let mut server = server.write().await;
        // Get the room ID of the client who sent the request.
        let Some(room_id) = self.room_id.clone() else {
            // If the client is not in a room, return early.
            return;
        };
        // Try to get a mutable reference to the room with the obtained room ID.
        let Some(room) = server.rooms.get_mut(&room_id) else {
            // If the room does not exist, return early.
            return;
        };
        // Find the index of the client's sender in the room's list of senders.
        let Some(index) = room
            .senders
            .iter()
            .position(|sender| Arc::ptr_eq(sender, &self.sender))
        else {
            // If the client is not in the room, return early.
            return;
        };
        // Remove the client's sender from the room's list of senders.
        room.senders.remove(index);
        // Set the client's room ID to `None`.
        self.room_id = None;
        // Create a list of futures to send `LeaveRoom` response packets to
        // all other clients in the room. The `index` field of the response
        // packet is set to the index of the client's sender in the room's list
        // of senders.
        let mut futures = vec![];
        for sender in &room.senders {
            futures.push(self.send_packet(sender.clone(), ResponsePacket::Leave { index }));
        }
        // If the room is now empty, removes the room from the server's list
        // of rooms.
        if room.senders.is_empty() {
            server.rooms.remove(&room_id);
        }
        // Drop the write lock on the server's state.
        drop(server);
        // Wait for all futures to complete.
        join_all(futures).await;
    }
    /// This function handles an incoming message from a client.
    ///
    /// The message can be one of four types: `Text`, `Binary`, `Ping`, or `Close`.
    ///
    /// If the message is `Text`, the function parses the message as a `RequestPacket` and
    /// calls the appropriate function to handle the request. If the message cannot be
    /// parsed as a `RequestPacket`, the function does nothing and returns early.
    ///
    /// If the message is `Binary`, the function first acquires a read lock on the server's
    /// state. If the client is not currently in a room, the function drops the read lock and
    /// returns early. If the client is not in a room, or if the room does not exist, the
    /// function drops the read lock and returns early.
    ///
    /// The function then finds the index of the client's sender in the room's list of
    /// senders. If the client's sender is not in the room's list of senders, the function
    /// drops the read lock and returns early.
    ///
    /// The function then gets the binary data from the message and sets the first byte to
    /// the index of the client's sender in the room's list of senders. If there is no
    /// binary data in the message, the function drops the read lock and returns early.
    ///
    /// The function then determines where to send the message. If the first byte of the
    /// message is less than the number of clients in the room, the function sends the message
    /// to the client at that index in the room's list of senders. If the first byte of the
    /// message is equal to the number of clients in the room plus one, the function sends the
    /// message to all clients in the room, excluding the client that sent the message.
    ///
    /// If the first byte of the message is any other value, the function drops the read
    /// lock and returns early.
    ///
    /// Finally, the function drops the read lock and waits for all futures to complete.
    ///
    /// If the message is `Ping`, the function prints a message to stdout.
    ///
    /// If the message is `Pong`, the function prints a message to stdout.
    ///
    /// If the message is `Close`, the function prints a message to stdout and calls the
    /// `handle_close` function.
    pub async fn handle_message(&mut self, server: &RwLock<AppState>, message: Message) {
        match message {
            Message::Text(text) => {
@ -411,22 +185,18 @@ impl Client {
                }
            }
            Message::Binary(_) => {
                // Acquire a read lock on the server's state.
                let server = server.read().await;
                // If the client is not currently in a room, return early.
                let Some(room_id) = &self.room_id else {
                    drop(server);
                    return;
                };
                // If the room does not exist, return early.
                let Some(room) = server.rooms.get(room_id) else {
                    drop(server);
                    return;
                };
                // Find the index of the client's sender in the room's list of senders.
                let Some(index) = room
                    .senders
                    .iter()
@ -436,8 +206,6 @@ impl Client {
                    return;
                };
                // Get the binary data from the message and set the first byte to
                // the index of the client's sender in the room's list of senders.
                let mut data = message.into_data();
                if data.is_empty() {
                    drop(server);
@ -446,12 +214,9 @@ impl Client {
                let source = u8::try_from(index).unwrap();
                // Determine where to send the message.
                let destination = usize::from(data[0]);
                data[0] = source;
                // Send the message to the client at the destination index in the
                // room's list of senders.
                if destination < room.senders.len() {
                    let sender = room.senders[destination].clone();
@ -459,8 +224,6 @@ impl Client {
                    return self.send(sender, Message::Binary(data)).await;
                }
                // Send the message to all clients in the room, excluding the
                // client that sent the message.
                if destination == usize::from(u8::MAX) {
                    let mut futures = vec![];
                    for sender in &room.senders {
--- a/caesar-core/src/relay/mod.rs
+++ b/caesar-core/src/relay/mod.rs
@ -8,15 +8,6 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "camelCase")]
 // This enum is used to represent the different types of requests that a client
 // can send to the server.
 //
 // The requests that a client can send are:
 //
 // * Join: A request to join a room. The request contains the ID of the room
 // that the client wants to join.
 // * Create: A request to create a new room.
 // * Leave: A request to leave the current room.
 pub enum RequestPacket {
    Join {
        // The ID of the room that the client wants to join.
@ -28,45 +19,20 @@ pub enum RequestPacket {
    Leave,
 }
 /// This enum is used to represent the different types of responses that the
 /// server can send to the client.
 ///
 /// The responses that the server can send are:
 ///
 /// * Join: A response to a `Join` request from the client. If the client
 /// successfully joined a room, the `size` field will be `Some` and contain
 /// the size of the room. If the client could not join a room, the `size` field
 /// will be `None`.
 /// * Create: A response to a `Create` request from the client. If the server
 /// successfully created a room, the `id` field will contain the ID of the
 /// room. If the server could not create a room, the `id` field will be empty.
 /// * Leave: A response to a `Leave` request from the client. If the client
 /// successfully left a room, the `index` field will contain the index of the
 /// client that left the room. If the client could not leave a room, the
 /// `index` field will be 0.
 /// * Error: A response to indicate that an error occurred. The `message`
 /// field will contain a description of the error.
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "camelCase")]
 pub enum ResponsePacket {
    Join {
        /// The size of the room that the client joined. If the client could
        /// not join a room, this field will be `None`.
        #[serde(skip_serializing_if = "Option::is_none")]
        size: Option<usize>,
    },
    Create {
        /// The ID of the room that the server created. If the server could
        /// not create a room, this field will be empty.
        id: String,
    },
    Leave {
        /// The index of the client that left the room. If the client could not
        /// leave a room, this field will be 0.
        index: usize,
    },
    Error {
        /// A description of the error that occurred.
        message: String,
    },
 }
--- a/caesar-core/src/relay/room.rs
+++ b/caesar-core/src/relay/room.rs
@ -3,44 +3,8 @@ use futures_util::stream::SplitSink;
 use std::sync::Arc;
 use tokio::sync::Mutex;
 // A type alias for a sender to a WebSocket connection.
 //
 // The sender is a mutex-guarded, split sink of a WebSocket stream and Message
 // values. It is used to send messages to a client.
 //
 // The Mutex is used to ensure that only one thread can send a message at a
 // time. This is because the SplitSink is not thread-safe, and sending a
 // message from multiple threads could result in the messages being sent
 // out of order.
 //
 // The SplitSink is used to send messages to a client. It is the part of the
 // WebSocket stream that handles the sending of messages.
 //
 // The WebSocket stream is the underlying connection to the client. It is used
 // to send and receive messages.
 //
 // The Message value is the type of data that is sent over the WebSocket
 // connection. It is a struct that contains the data that is being sent.
 //
 // The type alias is used so that the type is not mentioned every time it is
 // used. This makes the code easier to read and understand.
 type Sender = Arc<Mutex<SplitSink<WebSocket, Message>>>;
 /// A `Room` is a collection of clients that are connected to each other.
 ///
 /// Each room has a set of clients, represented by a `Vec` of `Sender`
 /// instances. The `Sender` instances are used to send messages to the
 /// clients in the room.
 ///
 /// The `senders` field is the list of senders that are connected to each
 /// other. Each sender is a mutex-guarded, split sink of a WebSocket
 /// stream and Message values. This is explained in more detail in the
 /// documentation for the `Sender` type alias in the `packets` module.
 ///
 /// The `size` field is the maximum number of clients that a room can have.
 /// When a room reaches its maximum size, no more clients can join the room.
 /// This is used to prevent rooms from getting too full and causing the
 /// server to run out of memory.
 #[derive(Debug, Clone)]
 pub struct Room {
    pub senders: Vec<Sender>,
@ -48,25 +12,11 @@ pub struct Room {
 }
 impl Room {
    /// The default size of a room.
    ///
    /// This is the size that a room will have when it is created.
    pub const DEFAULT_ROOM_SIZE: usize = 2;
    /// Creates a new `Room` with the given size.
    ///
    /// The `size` parameter is the maximum number of clients that can join the
    /// room. If `size` is 0, then the room will not be able to hold any
    /// clients.
    ///
    /// The `senders` field of the returned `Room` is an empty vector.
    ///
    /// The `size` field of the returned `Room` is `size`.
    pub fn new(size: usize) -> Room {
        Room {
            // Initialize the list of senders to be empty.
            senders: Vec::new(),
            // Set the size of the room.
            size,
        }
    }
--- a/caesar-core/src/relay/server.rs
+++ b/caesar-core/src/relay/server.rs
@ -1,20 +1,3 @@
 /// This function starts the WebSocket server.
 ///
 /// It configures the server to listen on the specified host and port. If
 /// these values are not specified in the environment, it falls back to using
 /// the defaults of "0.0.0.0" for the host and "8000" for the port.
 ///
 /// It then sets up the application routes for the server. In this case, the
 /// only route is for the WebSocket connection.
 ///
 /// The WebSocket route requires a `ConnectInfo` extractor to get the client's
 /// IP address, which is then used to store the client in a data structure
 /// keyed by their IP address. This allows for efficient lookup of clients by
 /// their IP address.
 ///
 /// Finally, it starts the server by binding to the specified host and port,
 /// and running the application. If the server fails to bind to the specified
 /// host and port, it logs an error and exits.
 use axum::{
    extract::{ws::WebSocket, Json, Path, State, WebSocketUpgrade},
    http::StatusCode,
@ -25,7 +8,7 @@ use axum::{
 use futures_util::StreamExt;
 use serde_json::json;
-use std::{env, net::SocketAddr, sync::Arc};
+use std::{net::SocketAddr, sync::Arc};
 use tokio::{
    net::TcpListener,
    signal,
@ -38,64 +21,15 @@ use crate::relay::client::Client;
 use crate::relay::transfer::TransferResponse;
 use crate::relay::{appstate::AppState, transfer::TransferRequest};
-/// This function starts the WebSocket server.
+pub async fn start_ws(port: &i32, listen_addr: &String) {
-///
+    let app_host = listen_addr;
-/// It retrieves the environment variables that define how the server should
+    let app_port = port;
 /// be configured. If any of these variables are not defined, it sets a
 /// reasonable default value.
 ///
 /// The environment variables are:
 ///
 /// * `APP_ENVIRONMENT`: the environment the server is running in (defaults
 ///   to "development").
 /// * `APP_HOST`: the host the server should listen on (defaults to "0.0.0.0").
 /// * `APP_PORT`: the port the server should listen on (defaults to "8000").
 /// * `APP_DOMAIN`: the domain the server is accessible at (defaults to "").
 ///
 /// It then sets up the application routes for the server. In this case, the
 /// only route is for the WebSocket connection.
 ///
 /// The WebSocket route requires a `ConnectInfo` extractor to get the client's
 /// IP address, which is then used to store the client in a data structure
 /// keyed by their IP address. This allows for efficient lookup of clients by
 /// their IP address.
 ///
 /// Finally, it starts the server by binding to the specified host and port,
 /// and running the application. If the server fails to bind to the specified
 /// host and port, it logs an error and exits.
 pub async fn start_ws(port: Option<&i32>, listen_addr: Option<&String>) {
    // Retrieve environment variables and set defaults if necessary.
    let app_environemt = env::var("APP_ENVIRONMENT").unwrap_or("development".to_string());
    let app_host = match listen_addr {
        Some(address) => address.to_string(),
        None => env::var("APP_HOST").unwrap_or("0.0.0.0".to_string()),
    };
    let app_port = match port {
        Some(port) => port.to_string(),
        None => env::var("APP_PORT").unwrap_or("8000".to_string()),
    };
    // Log information about the server's configuration.
    debug!("Server configured to accept connections on host {app_host}...",);
    debug!("Server configured to listen connections on port {app_port}...",);
    // Based on the environment variable, set the logging level.
    match app_environemt.as_str() {
        "development" => {
            debug!("Running in development mode");
        }
        "production" => {
            debug!("Running in production mode");
        }
        _ => {
            debug!("Running in development mode");
        }
    }
    // Create a new server data structure.
    let server = AppState::new();
    // Set up the application routes.
    let app = Router::new()
        .route("/ws", get(ws_handler))
        .route("/upload", put(upload_info))
@ -107,12 +41,9 @@ pub async fn start_ws(port: Option<&i32>, listen_addr: Option<&String>) {
                .make_span_with(DefaultMakeSpan::default().include_headers(true)),
        );
    // Attempt to bind to the specified host and port.
    if let Ok(listener) = TcpListener::bind(&format!("{}:{}", app_host, app_port)).await {
        // Log successful binding.
        info!("Listening on: {}", listener.local_addr().unwrap());
        // Run the server.
        axum::serve(
            listener,
            app.into_make_service_with_connect_info::<SocketAddr>(),
@ -121,92 +52,19 @@ pub async fn start_ws(port: Option<&i32>, listen_addr: Option<&String>) {
        .await
        .unwrap();
    } else {
        // Log binding failure and exit.
        error!("Failed to listen on: {}:{}", app_host, app_port);
    }
 }
 /// This function is an endpoint for the WebSocket route.
 ///
 /// This function is called whenever a client makes a WebSocket request to
 /// the `/ws` endpoint.
 ///
 /// The function takes two arguments:
 ///
 /// - `ws`: This is the WebSocketUpgrade object, which is used to upgrade the
 ///   HTTP connection to a WebSocket connection.
 /// - `State(shared_state)`: This is the state of the server, which is stored
 ///   in a read-write lock. The state is shared between all WebSocket
 ///   connections.
 /// - `ConnectInfo(addr)`: This is the information about the client that
 ///   connected to the server. The function uses this information to log the
 ///   address of the client that connected to the server.
 ///
 /// The function upgrades the HTTP connection to a WebSocket connection using
 /// the `ws` argument. It then passes the upgraded WebSocket connection, along
 /// with the state of the server, to the `handle_socket` function.
 ///
 /// The `handle_socket` function is defined in the `src/relay/mod.rs` file. It
 /// is the function that handles the WebSocket connection.
 ///
 /// The `handle_socket` function takes three arguments:
 ///
 /// - `socket`: This is the WebSocket connection that it should handle.
 /// - `who`: This is the address of the client that connected to the server.
 /// - `rooms`: This is the state of the server, which is stored in a read-write
 ///   lock. The state is shared between all WebSocket connections.
 ///
 /// The `handle_socket` function handles the WebSocket connection by calling
 /// the `handle_message` function on a `Client` object that it creates. The
 /// `handle_message` function is defined in the `src/relay/client.rs` file. The
 /// `handle_message` function handles incoming messages from the client and
 /// takes care of sending the appropriate response back to the client.
 pub async fn ws_handler(
    ws: WebSocketUpgrade,
    State(shared_state): State<Arc<RwLock<AppState>>>,
    // ConnectInfo(addr): ConnectInfo<SocketAddr>,
 ) -> impl IntoResponse {
    debug!("Got Request on Websocket route");
    // debug!("WebSocket connection established from:{}", addr.to_string());
    debug!("Upgrading Connection");
    ws.on_upgrade(move |socket| handle_socket(socket, shared_state))
 }
 /// This function is called when a new WebSocket connection is established.
 /// The function takes three arguments:
 ///
 /// - `socket`: This is the WebSocket connection that it should handle.
 /// - `who`: This is the address of the client that connected to the server.
 /// - `rooms`: This is the state of the server, which is stored in a read-write
 ///   lock. The state is shared between all WebSocket connections.
 ///
 /// The function creates a `Client` object, which will handle the WebSocket
 /// connection. The `Client` object is created with an Arc-wrapped Mutex
 /// containing the `sender` of the WebSocket connection. The `sender` is used to
 /// send messages to the client.
 ///
 /// The function then creates a new `split` of the WebSocket connection, which
 /// is a pair of a `sender` and a `receiver`. The `sender` is used to send
 /// messages to the client, and the `receiver` is used to receive messages from
 /// the client. The `receiver` is wrapped in a `Stream` (which is an async
 /// iterator) so that the function can use the `next` method to receive messages
 /// from the client.
 ///
 /// The function then enters a loop that receives incoming messages from the
 /// client and handles them. For each received message, the function calls the
 /// `handle_message` method on the `Client` object that it created. The
 /// `handle_message` method is defined in the `src/relay/client.rs` file. The
 /// `handle_message` method handles incoming messages from the client and
 /// takes care of sending the appropriate response back to the client.
 ///
 /// If the function encounters an error while reading a message from the
 /// client, it logs the error and breaks out of the loop.
 ///
 /// After the loop finishes (either because an error occurred or because the
 /// client disconnected), the function calls the `handle_close` method on the
 /// `Client` object that it created. The `handle_close` method is defined in the
 /// `src/relay/client.rs` file. The `handle_close` method handles the close event
 /// from the client.
 async fn handle_socket(socket: WebSocket, rooms: Arc<RwLock<AppState>>) {
    let (sender, mut receiver) = socket.split();
@ -227,32 +85,13 @@ async fn handle_socket(socket: WebSocket, rooms: Arc<RwLock<AppState>>) {
    client.handle_close(&rooms).await
 }
 /// This function sets up a signal handler for SIGINT (Ctrl+C) and SIGTERM
 /// (terminate) on Unix platforms. It does nothing on non-Unix platforms.
 ///
 /// The function installs two signal handlers: one for SIGINT and one for
 /// SIGTERM. When either of these signals is received, the signal handler
 /// simply resolves the future with `()`. This allows the main function to
 /// wait for the signal handler to trigger a shutdown.
 ///
 /// The function uses the `tokio::select!` macro to wait for either of the
 /// signal handlers to resolve. When the future returned by `tokio::select!`
 /// resolves, the function simply drops the value and does nothing else.
 ///
 /// The function does not actually do anything itself. It simply waits for
 /// one of the signal handlers to trigger a shutdown.
 async fn shutdown_signal() {
    // Install a signal handler for SIGINT (Ctrl+C). This future resolves
    // when the user presses Ctrl+C.
    let ctrl_c = async {
        signal::ctrl_c()
            .await
            .expect("failed to install Ctrl+C handler");
    };
    // Install a signal handler for SIGTERM (terminate). This future
    // resolves when the operating system sends a SIGTERM signal to the
    // program.
    #[cfg(unix)]
    let terminate = async {
        signal::unix::signal(signal::unix::SignalKind::terminate())
@ -261,30 +100,19 @@ async fn shutdown_signal() {
            .await;
    };
    // If we are not on a Unix platform, we don't need to install a signal
    // handler for SIGTERM. Instead, we create a future that never resolves.
    #[cfg(not(unix))]
    let terminate = std::future::pending::<()>();
    // Wait for either of the two signal handlers to resolve. When one of them
    // resolves, the other one may still be waiting, but it doesn't matter
    // because we don't need to do anything else.
    tokio::select! {
        // If the Ctrl+C signal handler resolves, drop the value and do
        // nothing else.
        _ = ctrl_c => {},
        // If the terminate signal handler resolves, drop the value and do
        // nothing else.
        _ = terminate => {},
    }
 }
 pub async fn upload_info(
    State(shared_state): State<Arc<RwLock<AppState>>>,
    // ConnectInfo(addr): ConnectInfo<SocketAddr>,
    Json(payload): Json<TransferRequest>,
 ) -> impl IntoResponse {
    // debug!("Got upload request from {}", addr.ip().to_string());
    let mut data = shared_state.write().await;
    match data
        .transfers
--- a/caesar-core/src/sender/client.rs
+++ b/caesar-core/src/sender/client.rs
@ -31,94 +31,22 @@ const NONCE_SIZE: usize = 12;
 const MAX_CHUNK_SIZE: isize = u16::MAX as isize;
 const DELAY: Duration = Duration::from_millis(750);
 /// A file that is to be sent.
 ///
 /// This structure contains all the information about a file that is to be
 /// sent. It is used to keep track of the files that a user wants to send.
 #[derive(Clone)]
 struct File {
    /// The path to the file on the file system.
    ///
    /// This is the path to the file on the user's file system. The path is
    /// used to open the file and read its contents.
    path: String,
    /// The name of the file.
    ///
    /// This is the name that the file will have when it is received by the
    /// receiver. This name is used when creating the file on the receiver's
    /// file system.
    name: String,
    /// The size of the file in bytes.
    ///
    /// This is the size of the file in bytes. The size is used to calculate
    /// the number of chunks that the file will be split into, and is also
    /// used to keep track of the progress of the file being sent.
    size: u64,
 }
 /// The context for the sender.
 ///
 /// This structure contains all the information that the sender needs in order
 /// to function properly. It is used to keep track of the state of the
 /// sender, and to pass information between functions.
 struct Context {
    /// The HMAC key for the sender.
    ///
    /// This is the key that is used to sign packets. The key is also used to
    /// generate a URL that the receiver can use to join the session.
    hmac: Vec<u8>,
    /// The sender that is used to send packets to the receiver.
    ///
    /// This sender is used to send handshake packets, list packets, chunk
    /// packets, and progress packets to the receiver.
    sender: Sender,
    /// The ephemeral keypair that is used to establish a shared key with the
    /// receiver.
    ///
    /// This key is used to establish a shared key between the sender and
    /// receiver. The key is ephemeral, meaning that it is only used once in
    /// the session. The key is generated when the sender is created, and is
    /// then discarded after the session is complete.
    key: EphemeralSecret,
    /// The files that the sender wants to send.
    ///
    /// This vec contains all the information about the files that the sender
    /// wants to send. The vec is filled when the user specifies the files to
    /// send using the command line arguments.
    files: Vec<File>,
    /// The shared key that is used to encrypt packets.
    ///
    /// This value is set to `None` initially, and is set to `Some` when the
    /// shared key is established with the receiver. The shared key is used to
    /// encrypt packets that are sent to the receiver.
    shared_key: Option<Aes128Gcm>,
    /// The task that is running in the background to send chunks of files to
    /// the receiver.
    ///
    /// This task is created when the sender is created, and is used to send
    /// chunks of files to the receiver in the background. The task is
    /// initially set to `None`, but is set to `Some` when the task is spawned.
    /// The task is used to cancel the background task when the sender is
    /// dropped.
    task: Option<JoinHandle<()>>,
 }
 /// This function is called when the client receives a create room packet
 /// from the server. The function is responsible for printing a URL to the
 /// console that the user can use to join the room.
 ///
 /// The function first generates a base64 string from the hmac value that is
 /// used to verify the integrity of the room. The base64 string is then
 /// appended to the room id to create a URL. The URL is then printed to the
 /// console using the qr2term library. Finally, the function prints a
 /// message to the console with the URL.
 fn on_create_room(
    context: &Context,
    id: String,
@ -130,7 +58,6 @@ fn on_create_room(
    let base64 = general_purpose::STANDARD.encode(&context.hmac);
    let url = format!("{}-{}", id, base64);
    // let rand_name = generate_random_name();
    let hash_name = hash_random_name(transfer_name.clone());
    let send_url = url.to_string();
@ -146,8 +73,6 @@ fn on_create_room(
    .join()
    .unwrap();
    debug!("Got Result: {:?}", res);
    // Print a newline to the console to separate the output from the command
    // line.
    match res {
        Ok(transfer_response) => {
            if !transfer_response.local_room_id.is_empty()
@ -155,20 +80,11 @@ fn on_create_room(
            {
                println!();
                // Try to generate a QR code from the URL. If the function fails for some
                // reason, print an error message to the console.
                // if let Err(error) = qr2term::print_qr(&url) {
                //     error!("Failed to generate QR code: {}", error);
                // }
                if let Err(error) = qr2term::print_qr(&transfer_name) {
                    error!("Failed to generate QR code: {}", error);
                }
                // Print a newline to the console to separate the output from the command
                // line.
                println!();
                // Print a message to the console with the URL.
                println!("Created room: {}", url);
                println!("Transfername is: {}", transfer_name);
            }
@ -178,43 +94,21 @@ fn on_create_room(
        }
    }
    // Continue the event loop.
    Status::Continue()
 }
 /// This function is called when the client receives a join room packet from
 /// the server. The function is responsible for sending a handshake packet to
 /// the server containing the client's public key and a signature generated
 /// using the client's private key and the room's hmac value.
 ///
 /// The function first generates the client's public key from the private key.
 /// The public key is then serialized into a byte array.
 ///
 /// Next, the function creates a HMAC object with the room's hmac value and
 /// updates it with the serialized public key. The resulting HMAC is then
 /// serialized into a byte array and used as the signature in the handshake
 /// packet.
 ///
 /// Finally, the function sends the handshake packet to the server using the
 /// sender object.
 fn on_join_room(context: &Context, size: Option<usize>) -> Status {
    if size.is_some() {
        return Status::Err("Invalid join room packet.".into());
    }
    // Generate the client's public key from the private key.
    let public_key = context.key.public_key().to_sec1_bytes().into_vec();
    // Create a HMAC object with the room's hmac value and update
    // it with the serialized public key.
    let mut mac = Hmac::<Sha256>::new_from_slice(&context.hmac).unwrap();
    mac.update(&public_key);
    // Serialize the resulting HMAC into a byte array and use it as the
    // signature in the handshake packet.
    let signature = mac.finalize().into_bytes().to_vec();
    // Create the handshake packet and send it to the server.
    let handshake = HandshakePacket {
        public_key,
        signature,
@ -227,106 +121,27 @@ fn on_join_room(context: &Context, size: Option<usize>) -> Status {
    Status::Continue()
 }
 /// This function is called when an error packet is received from the
 /// server. It creates a `Status::Err` variant containing the error
 /// message from the server and returns it to be handled by the main
 /// event loop.
 ///
 /// When an error occurs, the server sends an error packet to the
 /// client. The error packet contains a message with a description of
 /// the error. This function extracts that message and creates a
 /// `Status::Err` variant with it, which is then returned to be handled
 /// by the main event loop.
 ///
 /// The main event loop checks the status of the client and performs
 /// the necessary actions based on its value. If the status is
 /// `Status::Err`, the event loop exits with an error message
 /// containing the error message from the server.
 ///
 /// This function is called from the event loop when an error packet is
 /// received from the server.
 fn on_error(message: String) -> Status {
    Status::Err(message)
 }
 /// This function is called when the server sends a leave room packet to
 /// the client. It is responsible for aborting the file transfer task,
 /// generating a new ECDH key pair for the next handshake, and setting the
 /// shared key to `None`.
 ///
 /// When the server sends a leave room packet to the client, it means that
 /// the receiver has disconnected from the room. In this case, the client
 /// should abort the file transfer task and print an error message to the
 /// user.
 ///
 /// If the client is currently transferring files, it should abort the task
 /// by calling `AbortHandle::abort` on the task handle.
 ///
 /// After that, the client should generate a new ECDH key pair using the
 /// `EphemeralSecret::random` function from the `p256` crate. This key pair
 /// will be used for the next handshake with the server.
 ///
 /// Finally, the client should set the shared key to `None` to indicate that
 /// there is no shared key established for the current room.
 ///
 /// This function is called from the event loop when a leave room packet is
 /// received from the server.
 fn on_leave_room(context: &mut Context, _: usize) -> Status {
    if let Some(task) = &context.task {
        // If the client is currently transferring files, abort the task
        // by calling `AbortHandle::abort` on the task handle.
        task.abort();
    }
    // Generate a new ECDH key pair for the next handshake.
    context.key = EphemeralSecret::random(&mut OsRng);
    // Set the shared key to `None` to indicate that there is no shared key
    // established for the current room.
    context.shared_key = None;
    // Set the task handle to `None` to indicate that there is no task
    // running.
    context.task = None;
    // Print an error message to the user indicating that the transfer was
    // interrupted because the receiver disconnected.
    println!();
    error!("Transfer was interrupted because the receiver disconnected.");
    // Continue the event loop.
    Status::Continue()
 }
 /// This function is called by the event loop when a progress packet is
 /// received from the server.
 ///
 /// The progress packet contains the index of the file that is being
 /// transferred and the current progress of that file as a percentage.
 ///
 /// If the client does not have a shared key established with the server,
 /// the function returns an error and does not continue. This indicates
 /// that the event loop should exit with an error message.
 ///
 /// The function then retrieves the file at the index specified by the
 /// progress packet from the context. If the index is out of bounds, the
 /// function returns an error and does not continue. This indicates that
 /// the event loop should exit with an error message.
 ///
 /// The function then prints a message to the console indicating which file
 /// is currently being transferred and what its progress is. The progress
 /// message is printed to the same line as a carriage return (`\r`) so that
 /// it overwrites the previous message.
 ///
 /// If the progress of the file is 100%, the function prints a newline
 /// (`\n`) to the console to move the cursor to the next line.
 ///
 /// If the progress of the last file is 100%, the function returns
 /// `Status::Exit()`. This indicates that the event loop should exit
 /// successfully.
 ///
 /// If any other condition is met, the function returns `Status::Continue()`.
 /// This indicates that the event loop should continue running.
 fn on_progress(context: &Context, progress: ProgressPacket) -> Status {
    if context.shared_key.is_none() {
        return Status::Err("Invalid progress packet: no shared key established".into());
@ -351,50 +166,12 @@ fn on_progress(context: &Context, progress: ProgressPacket) -> Status {
    Status::Continue()
 }
 /// This function reads a file in chunks, sends each chunk to the receiver over
 /// the WebSocket connection, and then sleeps for a short amount of time
 /// before sending the next chunk.
 ///
 /// The function takes the sender, the shared key, and a vector of files to
 /// transfer as arguments.
 ///
 /// For each file in the vector of files, the function reads the file in
 /// chunks, sends each chunk to the receiver over the WebSocket connection,
 /// and then sleeps for a short amount of time before sending the next chunk.
 ///
 /// The chunk size is set to the maximum chunk size. If the number of bytes
 /// left to read in the file is less than the chunk size, the chunk size is set
 /// to the number of bytes left to read.
 ///
 /// The function opens the file for reading using the tokio::fs::File::open
 /// function. If there is an error opening the file, the function prints an
 /// error message to the console and returns.
 ///
 /// The function reads the file in chunks using the read_exact function from
 /// the tokio::io::AsyncReadExt trait. If there is an error reading from the
 /// file, the function prints an error message to the console and returns.
 ///
 /// The function sends each chunk to the receiver over the WebSocket
 /// connection using the send_encrypted_packet function from the Sender struct.
 /// The function also increments the sequence number for each chunk that is
 /// sent.
 ///
 /// After sending all of the chunks for a file, the function sleeps for a short
 /// amount of time using the tokio::time::sleep function. This helps to prevent
 /// the sender from overwhelming the receiver with too many messages.
 ///
 /// The function repeats this process for all of the files in the vector of
 /// files.
 async fn on_chunk(sender: Sender, shared_key: Option<Aes128Gcm>, files: Vec<File>) {
    for file in files {
        // Initialize a sequence number for the chunks of this file
        let mut sequence = 0;
        // Set the chunk size to the maximum chunk size
        let mut chunk_size = MAX_CHUNK_SIZE;
        // Set the number of bytes left to read in the file
        let mut size = file.size as isize;
        // Open the file for reading
        let mut handle = match tokio::fs::File::open(file.path).await {
            Ok(handle) => handle,
            Err(error) => {
@ -404,64 +181,34 @@ async fn on_chunk(sender: Sender, shared_key: Option<Aes128Gcm>, files: Vec<File
        };
        while size > 0 {
            // If the number of bytes left to read in the file is less than the
            // chunk size, set the chunk size to the number of bytes left to read
            if size < chunk_size {
                chunk_size = size;
            }
            // Create a vector to hold the chunk of data to be read from the file
            let mut chunk = vec![0u8; chunk_size.try_into().unwrap()];
            // Read a chunk of data from the file into the vector
            handle.read_exact(&mut chunk).await.unwrap();
            // Send the chunk to the receiver over the WebSocket connection
            sender.send_encrypted_packet(
                &shared_key,
                DESTINATION,
                Value::Chunk(ChunkPacket { sequence, chunk }),
            );
            // Increment the sequence number for the next chunk
            sequence += 1;
            // Decrement the number of bytes left to read in the file
            size -= chunk_size;
        }
        // Sleep for a short amount of time to prevent overwhelming the receiver
        // with too many messages
        sleep(DELAY).await;
    }
 }
 /// This function sends a ListPacket to the receiver containing the list of
 /// files to be transferred. The ListPacket contains a vector of Entry structs,
 /// each of which represents one file.
 ///
 /// The function creates a vector of Entry structs from the vector of File structs
 /// in the Context struct. Each Entry struct contains the index, name, and size
 /// of the corresponding File struct.
 ///
 /// The function then sends the ListPacket to the receiver using the send_encrypted_packet
 /// function from the Sender struct.
 ///
 /// After sending the ListPacket, the function spawns a task using tokio::spawn to
 /// call the on_chunk function with the Sender, shared_key, and vector of File
 /// structs as arguments. The on_chunk function will send each chunk of data for
 /// each file to the receiver.
 ///
 /// The function returns Status::Continue(), which tells the main loop to continue
 /// running until all of the files have been transferred.
 fn on_handshake_finalize(context: &mut Context) -> Status {
    let mut entries = vec![];
    for (index, file) in context.files.iter().enumerate() {
        let entry = list_packet::Entry {
            // The index of the file in the vector of Files in the Context struct
            index: index.try_into().unwrap(),
            // The name of the file
            name: file.name.clone(),
            // The size of the file in bytes
            size: file.size,
        };
@ -483,90 +230,34 @@ fn on_handshake_finalize(context: &mut Context) -> Status {
    Status::Continue()
 }
 /// Handshake function that is called when the Sender receives a HandshakeResponsePacket
 /// from the Receiver. This function verifies the signature from the Receiver and if
 /// successful, creates a shared key using the from the PublicKey struct.
 ///
 /// The shared key is used to encrypt and decrypt packets sent between the Sender
 /// and the Receiver.
 ///
 /// This function is called by the main loop in client.rs.
 fn on_handshake(context: &mut Context, handshake_response: HandshakeResponsePacket) -> Status {
    if context.shared_key.is_some() {
        // If the shared key is already established, this means that the Sender
        // has already performed the handshake, so return an error.
        return Status::Err("Already performed handshake.".into());
    }
    // Create a new HMAC using the hmac from the Context struct as the key.
    let mut mac = Hmac::<Sha256>::new_from_slice(&context.hmac).unwrap();
    // Update the HMAC with the public key from the HandshakeResponsePacket.
    mac.update(&handshake_response.public_key);
    // Call verify_slice() on the HMAC to verify the signature from the Receiver.
    // If the signature is invalid, return an error.
    let verification = mac.verify_slice(&handshake_response.signature);
    if verification.is_err() {
        return Status::Err("Invalid signature from the receiver.".into());
    }
    // Create a new PublicKey struct from the public key bytes in the
    // HandshakeResponsePacket.
    let shared_public_key = PublicKey::from_sec1_bytes(&handshake_response.public_key).unwrap();
    // Use the diffie_hellman() method from the PublicKey struct to create a shared
    // secret key between the Sender and the Receiver. The shared secret key is a
    // 16 byte long slice of bytes.
    let shared_secret = context.key.diffie_hellman(&shared_public_key);
    let shared_secret = shared_secret.raw_secret_bytes();
    let shared_secret = &shared_secret[0..16];
    // Create a new Key struct from the shared secret key. The Key<Aes128Gcm> type
    // is used to encrypt and decrypt packets.
    let shared_key: &Key<Aes128Gcm> = shared_secret.into();
    let shared_key = <Aes128Gcm as aes_gcm::KeyInit>::new(shared_key);
    // Set the shared_key field of the Context struct to the shared key.
    context.shared_key = Some(shared_key);
    // Call on_handshake_finalize() to start the transfer of files between the
    // Sender and the Receiver.
    on_handshake_finalize(context)
 }
 /// This function is called by the `Sender` when a new message is received over
 /// the WebSocket connection. The message could be a text message or a binary
 /// message. If it is a text message, it will be deserialized into a
 /// `JsonPacketResponse` enum. If it is a binary message, it will be decrypted
 /// if necessary and then deserialized into a `Packet` struct.
 ///
 /// The `JsonPacketResponse` enum will have one of the following variants:
 ///
 /// * `Create { id }`: The Receiver has created a new room with the given ID.
 /// * `Join { size }`: The Receiver has joined a room with `size` number of
 ///   files.
 /// * `Leave { index }`: The Receiver has left a room.
 /// * `Error { message }`: The Receiver has encountered an error.
 ///
 /// If the message is a binary message, the `Packet` struct will have a
 /// `Value` variant that will have one of the following variants:
 ///
 /// * `HandshakeResponse`: The Receiver has responded to the Sender's
 ///   `Handshake` packet.
 /// * `Progress`: The Receiver has sent progress information for one of the
 ///   files in the room.
 ///
 /// This function does the following:
 ///
 /// * If the message is a text message, it is deserialized into a
 ///   `JsonPacketResponse` enum and then matched on to call the appropriate
 ///   function.
 /// * If the message is a binary message, it is decrypted if necessary and then
 ///   deserialized into a `Packet` struct. The `Value` variant of the `Packet`
 ///   struct is then matched on to call the appropriate function.
 ///
 /// If the message is invalid, an error is returned.
 fn on_message(
    context: &mut Context,
    message: WebSocketMessage,
@ -574,60 +265,52 @@ fn on_message(
    transfer_name: String,
    is_local: bool,
 ) -> Status {
-    if message.is_text() {
+    match message.clone() {
-        let text = message.into_text().unwrap();
+        WebSocketMessage::Text(text) => {
-        let packet = serde_json::from_str(&text).unwrap();
+            let packet = match serde_json::from_str(&text) {
                Ok(packet) => packet,
                Err(_) => {
                    return Status::Continue();
                }
            };
            return match packet {
                JsonPacketResponse::Create { id } => {
                   on_create_room(context, id, relay, transfer_name, is_local) 
                }
                JsonPacketResponse::Join { size } => on_join_room(context, size),
                JsonPacketResponse::Leave { index } => on_leave_room(context, index),
                JsonPacketResponse::Error { message } => on_error(message),
            };
        }
        WebSocketMessage::Binary(data) => {
            let data = data[1..].to_vec();
-        return match packet {
+            let data = if let Some(shared_key) = &context.shared_key {
-            JsonPacketResponse::Create { id } => {
+                let nonce = &data[..NONCE_SIZE];
-                on_create_room(context, id, relay, transfer_name, is_local)
+                let ciphertext = &data[NONCE_SIZE..];
                shared_key.decrypt(nonce.into(), ciphertext).unwrap()
            } else {
                data
            };
            let packet = Packet::decode(data.as_ref()).unwrap();
            let value = packet.value.unwrap();
            return match value {
                Value::HandshakeResponse(handshake_response) => {
                    on_handshake(context, handshake_response)
                }
                Value::Progress(progress) => on_progress(context, progress),
                _ => Status::Err(format!("Unexpected packet: {:?}", value)),
            }
-            JsonPacketResponse::Join { size } => on_join_room(context, size),
+        }
-            JsonPacketResponse::Leave { index } => on_leave_room(context, index),
+        _ => (),
            JsonPacketResponse::Error { message } => on_error(message),
        };
    } else if message.is_binary() {
        let data = message.into_data();
        let data = &data[1..];
        let data = if let Some(shared_key) = &context.shared_key {
            let nonce = &data[..NONCE_SIZE];
            let ciphertext = &data[NONCE_SIZE..];
            shared_key.decrypt(nonce.into(), ciphertext).unwrap()
        } else {
            data.to_vec()
        };
        let packet = Packet::decode(data.as_ref()).unwrap();
        let value = packet.value.unwrap();
        return match value {
            Value::HandshakeResponse(handshake_response) => {
                on_handshake(context, handshake_response)
            }
            Value::Progress(progress) => on_progress(context, progress),
            _ => Status::Err(format!("Unexpected packet: {:?}", value)),
        };
    }
    Status::Err("Invalid message type".into())
 }
 /// Starts the sender client. This function will attempt to create a room with a size of 2
 /// (the number of clients that will be joining the room) and then it will open a file for
 /// each of the paths provided. It will then read chunks of data from each file and send them
 /// to the server.
 ///
 /// This function takes two arguments:
 /// 1. `socket`: A `Socket` that represents the connection to the server.
 /// 2. `paths`: A `Vec` of `String`s that represent the paths to the files that will be sent
 ///     to the server.
 ///
 /// When the function is finished, it will exit and the transfer will be complete. If there
 /// is an error during the transfer, the function will print an error message to stdout and
 /// exit.
 pub async fn start(
    socket: Socket,
    paths: Vec<String>,
@ -636,44 +319,33 @@ pub async fn start(
    transfer_name: String,
    is_local: bool,
 ) {
    // Create a vector to store metadata about each file that will be sent.
    let mut files = vec![];
    // For each path in the `paths` vector:
    for path in paths {
        // Attempt to open the file at the given path.
        let handle = match fs::File::open(&path) {
            // If the file is successfully opened, store it in the `handle` variable.
            Ok(handle) => handle,
            // If there is an error, print an error message to stdout and exit the function.
            Err(error) => {
                error!("Error: Failed to open file '{}': {}", path, error);
                return;
            }
        };
        // Get the metadata for the file.
        let metadata = handle.metadata().unwrap();
        // If the file is a directory, print an error message to stdout and exit the function.
        if metadata.is_dir() {
            error!("Error: The path '{}' does not point to a file.", path);
            return;
        }
        // Get the file name from the path.
        let name = Path::new(&path).file_name().unwrap().to_str().unwrap();
        // Get the file size from the metadata.
        let size = metadata.len();
        // If the file is empty, print an error message to stdout and exit the function.
        if size == 0 {
            error!("Error: The file '{}' is empty and cannot be sent.", name);
            return;
        }
        // Add the file metadata to the `files` vector.
        files.push(File {
            name: name.to_string(),
            path,
@ -681,54 +353,35 @@ pub async fn start(
        });
    }
    // Generate a random key for HMAC.
    let mut hmac = [0u8; 32];
    OsRng.fill_bytes(&mut hmac);
    // Generate a random key for AES-GCM.
    let key = EphemeralSecret::random(&mut OsRng);
    // Create a channel to send packets to the server.
    let (sender, receiver) = flume::bounded(1000);
    // Split the socket into separate send and receive streams.
    let (outgoing, incoming) = socket.split();
    // Create a context that will be used throughout the transfer.
    let mut context = Context {
        // Store the sender half of the channel to send packets to the server.
        sender,
        // Store the ephemeral key for AES-GCM.
        key,
        // Store the files that will be sent to the server.
        files,
        // Store the HMAC key.
        hmac: hmac.to_vec(),
        // Set the shared key to None.
        shared_key: None,
        // Set the current task to None.
        task: None,
    };
    // Print a message to stdout indicating that the client is attempting to create a room.
    debug!("Attempting to create room...");
    // Send a JSON packet to the server to create a room with a size of 2.
    debug!("With Room-ID: {:?}", room_id);
    context.sender.send_json_packet(JsonPacket::Create {
        id: room_id.clone(),
    });
    // context.sender.send_json_packet(JsonPacket::Create);
    // Create a future that handles the outgoing stream of messages from the client to the
    // server.
    let outgoing_handler = receiver.stream().map(Ok).forward(outgoing);
    // Create a future that handles the incoming stream of messages from the server to the
    // client.
    let incoming_handler = incoming.try_for_each(|message| {
        // Call the `on_message` function to handle the incoming message.
        match on_message(
            &mut context,
            message,
@ -736,37 +389,26 @@ pub async fn start(
            transfer_name.clone(),
            is_local,
        ) {
            // If the status is `Status::Exit`, the transfer is complete. Print a message to
            // stdout and exit the function.
            Status::Exit() => {
                // TODO: Signal Exit to the server
                context.sender.send_json_packet(JsonPacket::Leave);
                println!("Transfer has completed.");
                // Exit the function with a `Result` of `Err`.
                return future::err(Error::ConnectionClosed);
            }
            // If the status is `Status::Err`, there was an error. Print an error message to
            // stdout and exit the function.
            Status::Err(error) => {
                error!("Error: {}", error);
                // Exit the function with a `Result` of `Err`.
                return future::err(Error::ConnectionClosed);
            }
            // Otherwise, the message was handled successfully.
            _ => {}
        };
        // Continue handling the incoming messages.
        future::ok(())
    });
    // Pin the `incoming_handler` and `outgoing_handler` futures so that they do not move.
    pin_mut!(incoming_handler, outgoing_handler);
    // Wait for either the `incoming_handler` or `outgoing_handler` to complete. If the
    // `incoming_handler` completes, return the result of the `incoming_handler`. If the
    // `outgoing_handler` completes, return the result of the `outgoing_handler`.
    future::select(incoming_handler, outgoing_handler).await;
 }
--- a/caesar-core/src/sender/mod.rs
+++ b/caesar-core/src/sender/mod.rs
@ -1,43 +1,3 @@
 /// Connects to the WebSocket server at `ws://0.0.0.0:8000/ws` with an
 /// `Origin` header of `ws://0.0.0.0:8000/ws`. This is the URL that the
 /// sender and receiver clients will connect to.
 ///
 /// The `start_sender` function takes a reference to a vector of strings,
 /// which are the paths to the files that the sender will send over the
 /// WebSocket connection.
 ///
 /// The function first creates a WebSocket request using the `IntoClientRequest`
 /// trait from `tungstenite`, which is defined on the `IntoClientRequest` struct.
 /// This struct is a type that represents a request to a WebSocket server.
 ///
 /// The `into_client_request` function returns a `Result` because it may fail
 /// to create the request. In this case, we do not handle the error, so we just
 /// return if the result is an error.
 ///
 /// Once we have a request, we insert the `Origin` header into the headers of
 /// the request. This is necessary because the WebSocket protocol requires the
 /// `Origin` header to be present in the handshake.
 ///
 /// After that, we print out a message to the console indicating that we are
 /// attempting to connect to the server.
 ///
 /// Next, we call the `connect_async` function from `tokio_tungstenite` which
 /// takes our request and attempts to connect to the server. This function
 /// returns a `Future` that resolves to a tuple of a `WebSocketStream` and a
 /// `Response` from the server. The `WebSocketStream` is a stream of
 /// WebSocket messages from the server, and the `Response` is the response
 /// from the server to our handshake request.
 ///
 /// If connecting to the server fails, we print out an error message and
 /// return.
 ///
 /// If connecting to the server succeeds, we pass the `WebSocketStream` and
 /// the paths to the files to the `start` function from the `sender` module.
 /// The `start` function is defined in the `sender` module, and it is the
 /// function that sends the files over the WebSocket connection.
 ///
 /// The `start` function takes ownership of the `WebSocketStream` and the file
 /// paths, so we pass it the `paths` vector by value.
 pub mod client;
 pub mod http_client;
 pub mod util;
@ -106,10 +66,8 @@ pub async fn start_local_ws() {
    let app_host = "0.0.0.0";
    let app_port = "9000";
    // Create a new server data structure.
    let server = AppState::new();
    // Set up the application routes.
    let app = Router::new()
        .route("/ws", get(ws_handler))
        .with_state(server)
@ -124,7 +82,6 @@ pub async fn start_local_ws() {
            listener.local_addr().unwrap()
        );
        // Run the server.
        axum::serve(
            listener,
            app.into_make_service_with_connect_info::<SocketAddr>(),
@ -132,7 +89,6 @@ pub async fn start_local_ws() {
        .await
        .unwrap();
    } else {
        // Log binding failure and exit.
        error!("Failed to listen on: {}:{}", app_host, app_port);
    }
 }
--- a/caesar-core/src/sender/util.rs
+++ b/caesar-core/src/sender/util.rs
@ -51,6 +51,6 @@ mod tests {
        assert!(name.contains('-'));
        assert!(name.split('-').count() == 3);
-        assert!(name.len() > 0);
+        assert!(name.is_empty());
    }
 }
--- a/caesar-core/src/shared.rs
+++ b/caesar-core/src/shared.rs
@ -14,180 +14,46 @@ use tokio::net::TcpStream;
 use tokio_tungstenite::tungstenite::protocol::Message as WebSocketMessage;
 use tokio_tungstenite::{MaybeTlsStream, WebSocketStream};
 /// This struct is used to serialize/deserialize JSON packets sent
 /// between the client and the server.
 ///
 /// The `type` field is used to specify the type of packet that is being sent.
 /// The possible values for this field are listed as variants of the enum.
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "camelCase")]
 pub enum JsonPacket {
-    /// Sent from the client to ask to join a room.
+    Join { id: String },
    ///
    /// The `id` field specifies the ID of the room that the client wants
    /// to join.
    Join {
        /// The ID of the room that the client wants to join.
        id: String,
    },
    /// Sent from the client to ask to create a new room.
    Create { id: Option<String> },
    // Create,
    /// Sent from the client to ask to leave the current room.
    Leave,
 }
 /// This struct is used to serialize/deserialize JSON packets sent
 /// from the server to the client.
 ///
 /// The `type` field is used to specify the type of packet that is being
 /// sent. The possible values for this field are listed as variants of the
 /// enum.
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "camelCase")]
 pub enum JsonPacketResponse {
    /// Sent from the server to inform the client of the result of a `Join`
    /// packet.
    ///
    /// If the client successfully joined a room, the `size` field will be
    /// `Some` and contain the size of the room. If the client could not join
    /// a room, the `size` field will be `None`.
    Join {
        /// The size of the room that the client joined. If the client could
        /// not join a room, this field will be `None`.
        #[serde(skip_serializing_if = "Option::is_none")]
        size: Option<usize>,
    },
    /// Sent from the server to inform the client of the result of a `Create`
    /// packet.
    ///
    /// If the server successfully created a room, the `id` field will
    /// contain the ID of the room. If the server could not create a room,
    /// the `id` field will be empty.
    Create {
        /// The ID of the room that the server created. If the server could
        /// not create a room, this field will be empty.
        id: String,
    },
    /// Sent from the server to inform the client of the result of a `Leave`
    /// packet.
    ///
    /// If the client successfully left a room, the `index` field will
    /// contain the index of the client that left the room. If the client
    /// could not leave a room, the `index` field will be 0.
    Leave {
        /// The index of the client that left the room. If the client could
        /// not leave a room, this field will be 0.
        index: usize,
    },
    /// Sent from the server to inform the client of an error.
    ///
    /// The `message` field contains a description of the error.
    Error {
        /// A description of the error that occurred.
        message: String,
    },
 }
 /// This enum represents the result of processing an event in the event loop.
 ///
 /// The `Status` enum has three variants:
 ///
 /// * `Continue` - This variant indicates that the event loop should
 ///   continue processing events. This is the most common result and is used
 ///   when the event loop has nothing special to do.
 ///
 /// * `Exit` - This variant indicates that the event loop should exit. This
 ///   is used when the event loop should exit because of an error or
 ///   because the user has requested that the program exit.
 ///
 /// * `Err` - This variant indicates that the event loop encountered an
 ///   error. When the event loop receives a `Status::Err` variant, it should
 ///   exit with an error message containing the message from the error packet.
 ///   The message from the error packet is the only information that the event
 ///   loop has about the error, so the message should be descriptive and
 ///   helpful to the user. The message should not contain technical details
 ///   about the error or how it occurred. Instead, the message should be
 ///   written from the perspective of the user and should give the user enough
 ///   information to understand what went wrong and how they might be able to
 ///   fix the problem.
 #[derive(Debug, PartialEq)]
 pub enum Status {
    /// Indicates that the event loop should continue processing events.
    Continue(),
    /// Indicates that the event loop should exit.
    Exit(),
    /// Indicates that the event loop encountered an error.
    Err(String),
 }
 /// A trait for sending JSON packets.
 ///
 /// This trait provides a single method, `send_json_packet`, which sends a
 /// JSON packet over some underlying transport.
 pub trait JsonPacketSender {
    /// Sends a JSON packet.
    ///
    /// This method takes a single argument, `packet`, which is the JSON packet
    /// to send. The packet will be serialized into a JSON string and then sent
    /// over the underlying transport.
    ///
    /// Note that the exact semantics of what it means to "send a JSON packet"
    /// will depend on the specific implementation of this trait. However, in
    /// general, the packet will be sent as a single message over the
    /// transport, and the transport will be responsible for ensuring that the
    /// packet is delivered to the intended recipient.
    ///
    /// # Errors
    ///
    /// If there is an error serializing the JSON packet, or if there is an
    /// error sending the serialized packet over the transport, this method
    /// may return an error. The exact semantics of what constitutes an error
    /// will depend on the specific implementation of this trait.
    fn send_json_packet(&self, packet: JsonPacket);
 }
 /// A trait for sending Protocol Buffers packets over some underlying transport.
 ///
 /// This trait provides two methods for sending Protocol Buffers packets:
 ///
 /// * `send_packet` sends a packet in the clear (i.e., not encrypted).
 /// * `send_encrypted_packet` sends a packet encrypted using the AES-GCM
 ///   algorithm with a 128-bit key.
 ///
 /// The exact semantics of what it means to "send a packet" will depend on the
 /// specific implementation of this trait. However, in general, the packet will
 /// be serialized into a binary message using the Protocol Buffers wire format,
 /// and then sent over the underlying transport.
 ///
 /// The `destination` argument specifies which recipient should receive the
 /// packet. This is a 1-byte field that is prepended to the serialized packet
 /// before it is sent.
 ///
 /// The `key` argument is an optional AES-GCM key. If a key is provided, the
 /// packet will be encrypted before being sent. If no key is provided, the
 /// packet will be sent in the clear.
 ///
 /// # Errors
 ///
 /// If there is an error serializing the Protocol Buffers packet, or if there
 /// is an error sending the serialized packet over the transport, either of
 /// these methods may return an error. The exact semantics of what constitutes
 /// an error will depend on the specific implementation of this trait.
 pub trait PacketSender {
    /// Sends a Protocol Buffers packet in the clear.
    ///
    /// The packet will be serialized into a binary message using the Protocol
    /// Buffers wire format, and then sent over the underlying transport.
    fn send_packet(&self, destination: u8, packet: packets::packet::Value);
    /// Sends a Protocol Buffers packet encrypted using AES-GCM.
    ///
    /// The packet will be serialized into a binary message using the Protocol
    /// Buffers wire format, encrypted using AES-GCM with a 128-bit key, and
    /// then sent over the underlying transport.
    ///
    /// If no key is provided, the packet will be sent in the clear.
    fn send_encrypted_packet(
        &self,
        key: &Option<Aes128Gcm>,
@ -197,22 +63,6 @@ pub trait PacketSender {
 }
 impl JsonPacketSender for Sender {
    /// Serializes the given JSON packet into a string, and then sends it as a
    /// text message over the underlying transport.
    ///
    /// The `JsonPacket` type is defined in the `serde_json` crate, and it is a
    /// simple wrapper around a JSON object with string keys and values. This
    /// trait method is responsible for taking a `JsonPacket` and sending it
    /// over the WebSocket connection.
    ///
    /// The `serde_json::to_string` function is used to serialize the packet
    /// into a JSON string. If this function returns an error, we panic
    /// because there is no reasonable recovery behavior in this case.
    ///
    /// Once we have the JSON string, we wrap it in a `WebSocketMessage::Text`
    /// enum variant and send it over the WebSocket connection using the
    /// `send` method. If this method returns an error, we panic because there
    /// is no reasonable recovery behavior in this case.
    fn send_json_packet(&self, packet: JsonPacket) {
        let serialized_packet =
            serde_json::to_string(&packet).expect("Failed to serialize JSON packet.");
@ -223,26 +73,6 @@ impl JsonPacketSender for Sender {
 }
 impl PacketSender for Sender {
    /// Serializes the given packet value into a binary message, and then
    /// sends it over the underlying transport.
    ///
    /// The `destination` parameter specifies which client should receive
    /// this message. The value of this parameter should be a byte that
    /// represents the client's index in the list of connected clients.
    ///
    /// The `value` parameter specifies the actual data that should be sent
    /// to the client. This will be serialized into a `Packet` struct using
    /// the Protocol Buffers wire format.
    ///
    /// This function will first encode the `Packet` struct into a vector of
    /// bytes using the Protocol Buffers wire format. It will then insert the
    /// `destination` byte as the first element of the vector, so that the
    /// receiving client knows which client this message is intended for.
    ///
    /// Finally, this function will send the serialized packet over the
    /// underlying transport, which is assumed to be a WebSocket connection.
    /// If this send operation fails, this function will panic because there
    /// is no reasonable recovery behavior in this case.
    fn send_packet(&self, destination: u8, value: packets::packet::Value) {
        let packet = Packet { value: Some(value) };
@ -253,21 +83,6 @@ impl PacketSender for Sender {
            .expect("Failed to send Packet.");
    }
    /// Similar to `send_packet`, but the message is encrypted using AES-GCM
    /// with a 128-bit key.
    ///
    /// If no key is provided (i.e., if `key` is `None`), then the message will
    /// be sent in the clear.
    ///
    /// This function works by generating a random 12-byte nonce using the
    /// `rand::OsRng` PRNG, encrypting the message using AES-GCM with the
    /// provided key and nonce, and then prepending the nonce to the ciphertext
    /// before sending it over the WebSocket connection. The receiving client
    /// will use the same key and nonce to decrypt the message.
    ///
    /// Note that this function does not actually check whether the provided
    /// key is valid. If an invalid key is provided, the encryption will fail
    /// and the receiver will not be able to decrypt the message.
    fn send_encrypted_packet(
        &self,
        key: &Option<Aes128Gcm>,
@ -293,43 +108,6 @@ impl PacketSender for Sender {
    }
 }
 /// A sender is a type that allows us to send messages to a WebSocket client.
 ///
 /// In this case, a sender is a channel that allows us to send WebSocket
 /// messages to a client. The messages can be any type that implements the
 /// `Into<WebSocketMessage>`.
 ///
 /// The `WebSocketMessage` type represents any message that can be sent over a
 /// WebSocket connection. It can be a binary message, a text message, or a
 /// close message.
 ///
 /// The `MaybeTlsStream` type is a stream that may or may not be encrypted.
 /// If the connection is encrypted (e.g., via TLS), then the stream will be
 /// encrypted. If the connection is not encrypted, then the stream will be
 /// unencrypted.
 ///
 /// The `TcpStream` type is a stream that is used to connect to a remote
 /// server over a TCP connection.
 ///
 /// The `WebSocketStream` type is a stream that is used to connect to a remote
 /// WebSocket server. It is a wrapper around the `MaybeTlsStream` stream that
 /// adds WebSocket-specific functionality.
 pub type Sender = flume::Sender<WebSocketMessage>;
 /// A socket is a type that represents a WebSocket connection.
 ///
 /// In this case, a socket is a wrapper around a `MaybeTlsStream` stream that
 /// adds WebSocket-specific functionality.
 ///
 /// The `MaybeTlsStream` type is a stream that may or may not be encrypted.
 /// If the connection is encrypted (e.g., via TLS), then the stream will be
 /// encrypted. If the connection is not encrypted, then the stream will be
 /// unencrypted.
 ///
 /// The `TcpStream` type is a stream that is used to connect to a remote
 /// server over a TCP connection.
 ///
 /// The `WebSocketStream` type is a stream that is used to connect to a remote
 /// WebSocket server. It is a wrapper around the `MaybeTlsStream` stream that
 /// adds WebSocket-specific functionality.
 pub type Socket = WebSocketStream<MaybeTlsStream<TcpStream>>;