added more changes to db.go

db.go

@@ -0,0 +1,148 @@
+package main
+
+import (
+	"crypto/sha256"
+	"database/sql"
+	"encoding/hex"
+	"fmt"
+	"os"
+
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/joho/godotenv"
+	"github.com/labstack/echo/v4"
+)
+
+var db *sql.DB
+
+func init() {
+	err := godotenv.Load()
+	if err != nil {
+		fmt.Println("Error loading .env file")
+		os.Exit(1)
+	}
+
+	dbHost := os.Getenv("DB_Host")
+	dbPort := os.Getenv("DB_Port")
+	dbName := os.Getenv("DB_Name")
+	dbCharset := os.Getenv("DB_Charset")
+	dbUser := os.Getenv("DB_User")
+	dbPassword := os.Getenv("DB_Password")
+
+	// Connect to the database
+	db, err = sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=%s", dbUser, dbPassword, dbHost, dbPort, dbName, dbCharset))
+	//	db, err = sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(db:3306)/%s?charset=utf8mb4", dbUser, dbPassword, dbName))
+
+	if err != nil {
+		fmt.Println("Error connecting to the database")
+		os.Exit(1)
+	}
+}
+
+// User struct
+type User struct {
+	ID          int          `json:"id"`
+	Username    string       `json:"username"`
+	Vorname     string       `json:"vorname"`
+	Nachname    string       `json:"nachname"`
+	Email       string       `json:"email"`
+	Password    string       `json:"password"`
+	LessonCount int          `json:"lesson_count"`
+	Level       int          `json:"level"`
+	XP          int          `json:"xp"`
+	Coins       int          `json:"coins"`
+	IsAdmin     sql.NullBool `json:"is_admin"`
+}
+
+// CRUD operations
+
+func getUsers(c echo.Context) error {
+	rows, err := db.Query("SELECT * FROM user")
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+
+	users := []User{}
+	for rows.Next() {
+		user := User{}
+		err := rows.Scan(&user.ID, &user.Username, &user.Vorname, &user.Nachname, &user.Email, &user.Password, &user.LessonCount, &user.Level, &user.XP, &user.Coins, &user.IsAdmin)
+		if err != nil {
+			return err
+		}
+		users = append(users, user)
+	}
+
+	return c.JSON(200, users)
+}
+
+func getUser(c echo.Context) error {
+	id := c.Param("id")
+
+	row := db.QueryRow("SELECT * FROM user WHERE id = ?", id)
+
+	user := User{}
+	err := row.Scan(&user.ID, &user.Username, &user.Vorname, &user.Nachname, &user.Email, &user.Password, &user.LessonCount, &user.Level, &user.XP, &user.Coins, &user.IsAdmin)
+	if err != nil {
+		return err
+	}
+
+	return c.JSON(200, user)
+}
+
+func createUser(c echo.Context) error {
+	user := new(User)
+	if err := c.Bind(user); err != nil {
+		return err
+	}
+
+	// Hash das Passwort
+	user.Password = hashPassword(user.Password)
+
+	result, err := db.Exec("INSERT INTO user (username, vorname, nachname, email, password, lesson_count, level, xp, coins, isAdmin) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+		user.Username, user.Vorname, user.Nachname, user.Email, user.Password, user.LessonCount, user.Level, user.XP, user.Coins, user.IsAdmin)
+	if err != nil {
+		return err
+	}
+
+	lastInsertID, err := result.LastInsertId()
+	if err != nil {
+		return err
+	}
+
+	user.ID = int(lastInsertID)
+
+	return c.JSON(201, user)
+}
+
+func updateUser(c echo.Context) error {
+	id := c.Param("id")
+
+	user := new(User)
+	if err := c.Bind(user); err != nil {
+		return err
+	}
+
+	_, err := db.Exec("UPDATE user SET username = ?, vorname = ?, nachname = ?, email = ?, password = ?, lesson_count = ?, level = ?, xp = ?, coins = ?, isAdmin = ? WHERE id = ?",
+		user.Username, user.Vorname, user.Nachname, user.Email, user.Password, user.LessonCount, user.Level, user.XP, user.Coins, user.IsAdmin, id)
+	if err != nil {
+		return err
+	}
+
+	return c.NoContent(204)
+}
+
+func deleteUser(c echo.Context) error {
+	id := c.Param("id")
+
+	_, err := db.Exec("DELETE FROM user WHERE id = ?", id)
+	if err != nil {
+		return err
+	}
+
+	return c.NoContent(204)
+}
+
+func hashPassword(password string) string {
+	hash := sha256.Sum256([]byte(password))
+	return hex.EncodeToString(hash[:])
+}