Added auth module for future

backend/src/modules/auth/auth.guard.ts

@@ -0,0 +1,36 @@
+import { CanActivate, ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { AuthService } from './auth.service';
+
+@Injectable()
+export class AuthGuard implements CanActivate {
+    constructor(
+        private reflector: Reflector,
+        private readonly authService: AuthService,
+    ) {}
+
+    canActivate(context: ExecutionContext) {
+        const request = context.switchToHttp().getRequest();
+        const allowUnauthorizedRequest = this.reflector.get<boolean>('allowUnauthorizedRequest', context.getHandler());
+
+        let token = this.extractTokenFromHeader(request.headers);
+
+        if (!token) {
+            token = request.query.access_token || request.body.access_token;
+        }
+        if (allowUnauthorizedRequest || this.authService.authUserByToken(token)) return true;
+        throw new UnauthorizedException('Unathorized!');
+    }
+
+    private extractTokenFromHeader(headers: any): string | null {
+        if (headers && headers.authorization) {
+            const authHeader = headers.authorization as string;
+            const headerParts = authHeader.split(' ');
+
+            if (headerParts.length === 2 && headerParts[0].toLowerCase() === 'bearer') {
+                return headerParts[1];
+            }
+        }
+        return null;
+    }
+}