super admin

auth guard

src/modules/auth/guards/superAdminAuth.guard.ts

@@ -0,0 +1,67 @@
+import { CanActivate, ExecutionContext, Injectable, UnauthorizedException, Inject, Logger } from '@nestjs/common';
+import { Request } from 'express';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable()
+export class SuperAdminAuthGuard implements CanActivate {
+  private readonly logger = new Logger(SuperAdminAuthGuard.name);
+
+  constructor(
+    @Inject(ConfigService)
+    private readonly configService: ConfigService,
+  ) {}
+
+  canActivate(context: ExecutionContext): boolean {
+    const request = context.switchToHttp().getRequest<Request>();
+
+    try {
+      const credentials = this.extractBasicAuthCredentials(request);
+      if (!credentials) {
+        throw new UnauthorizedException('Basic authentication required');
+      }
+
+      const { username, password } = credentials;
+      const expectedUsername = this.configService.getOrThrow<string>('SUPER_ADMIN_USERNAME');
+      const expectedPassword = this.configService.getOrThrow<string>('SUPER_ADMIN_PASSWORD');
+
+      if (username !== expectedUsername || password !== expectedPassword) {
+        this.logger.warn('Invalid super admin credentials attempt', { username });
+        throw new UnauthorizedException('Invalid credentials');
+      }
+
+      return true;
+    } catch (err) {
+      if (err instanceof UnauthorizedException) {
+        throw err;
+      }
+      this.logger.error('error in SuperAdminAuthGuard', err);
+      throw new UnauthorizedException('Authentication failed');
+    }
+  }
+
+  private extractBasicAuthCredentials(request: Request): { username: string; password: string } | null {
+    const authHeader = request.headers.authorization;
+    if (!authHeader) {
+      return null;
+    }
+
+    const [type, encoded] = authHeader.split(' ');
+    if (type?.toLowerCase() !== 'basic' || !encoded) {
+      return null;
+    }
+
+    try {
+      const decoded = Buffer.from(encoded, 'base64').toString('utf-8');
+      const [username, password] = decoded.split(':');
+
+      if (!username || !password) {
+        return null;
+      }
+
+      return { username, password };
+    } catch (error) {
+      this.logger.error('Failed to decode Basic Auth credentials', error);
+      return null;
+    }
+  }
+}