migration to typescript

Backend/src/config/index.ts

@@ -0,0 +1,75 @@
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+// Validate required environment variables
+const requiredEnvVars = [
+    'DATABASE_URL',
+    'JWT_SECRET',
+    'PORT'
+];
+
+requiredEnvVars.forEach(key => {
+    if (!process.env[key]) {
+        throw new Error(`Missing required environment variable: ${key}`);
+    }
+});
+
+export const config = {
+    // Application
+    nodeEnv: process.env.NODE_ENV || 'development',
+    port: parseInt(process.env.PORT || '4000', 10),
+    appUrl: process.env.APP_URL || 'http://localhost:4000',
+
+    // Database
+    databaseUrl: process.env.DATABASE_URL!,
+
+    // Redis
+    redis: {
+        url: process.env.REDIS_URL || 'redis://localhost:6379',
+        password: process.env.REDIS_PASSWORD
+    },
+
+    // MinIO/S3
+    s3: {
+        endpoint: process.env.S3_ENDPOINT || 'http://localhost:9000',
+        accessKey: process.env.S3_ACCESS_KEY || 'minioadmin',
+        secretKey: process.env.S3_SECRET_KEY || 'minioadmin',
+        bucket: process.env.S3_BUCKET || 'e-learning',
+        useSSL: process.env.S3_USE_SSL === 'true'
+    },
+
+    // JWT
+    jwt: {
+        secret: process.env.JWT_SECRET!,
+        expiresIn: process.env.JWT_EXPIRES_IN || '24h',
+        refreshExpiresIn: process.env.JWT_REFRESH_EXPIRES_IN || '7d'
+    },
+
+    // Email
+    smtp: {
+        host: process.env.SMTP_HOST || 'localhost',
+        port: parseInt(process.env.SMTP_PORT || '1025', 10),
+        user: process.env.SMTP_USER,
+        pass: process.env.SMTP_PASS,
+        from: process.env.SMTP_FROM || 'noreply@elearning.local'
+    },
+
+    // File Upload
+    upload: {
+        maxVideoSize: parseInt(process.env.MAX_VIDEO_SIZE || '524288000', 10), // 500MB
+        maxAttachmentSize: parseInt(process.env.MAX_ATTACHMENT_SIZE || '104857600', 10), // 100MB
+        maxAttachmentsPerLesson: parseInt(process.env.MAX_ATTACHMENTS_PER_LESSON || '10', 10)
+    },
+
+    // CORS
+    cors: {
+        origin: process.env.CORS_ORIGIN || 'http://localhost:3000'
+    },
+
+    // Rate Limiting
+    rateLimit: {
+        windowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS || '900000', 10), // 15 minutes
+        maxRequests: parseInt(process.env.RATE_LIMIT_MAX_REQUESTS || '100', 10)
+    }
+};