feat: extend rate limiting to all endpoints

meridian-api/src/app.module.ts

@@ -4,6 +4,7 @@ import { TypeOrmModule } from '@nestjs/typeorm';
 import { JwtModule } from '@nestjs/jwt';
 import { ThrottlerModule, ThrottlerGuard } from '@nestjs/throttler';
 import { APP_INTERCEPTOR, APP_GUARD } from '@nestjs/core';
+import { CustomThrottlerGuard } from './common/guards/custom-throttler.guard';
 import { DataSource } from 'typeorm';
 
 import { AppController } from './app.controller';
@@ -50,8 +51,14 @@ import { AuditModule } from './audit/audit.module';
      */
     ThrottlerModule.forRoot([
       {
+        name: 'read',
         ttl: 60000,
-        limit: 10,
+        limit: 100, // 100 requests per minute for GET
+      },
+      {
+        name: 'write',
+        ttl: 60000,
+        limit: 20, // 20 requests per minute for POST/PUT/PATCH/DELETE
       },
     ]),
 
@@ -117,7 +124,7 @@ import { AuditModule } from './audit/audit.module';
     },
     {
       provide: APP_GUARD,
-      useClass: ThrottlerGuard,
+      useClass: CustomThrottlerGuard,
     },
     AccessTokenGuard,
     MailProvider,

meridian-api/src/auth/auth.controller.ts

@@ -25,7 +25,7 @@ export class AuthController {
   constructor(private readonly authService: AuthService) {}
 
   @Post('/sign-in')
-  @Throttle({ default: { limit: 5, ttl: 15000 } })
+  @Throttle({ write: { limit: 5, ttl: 15000 } })
   @HttpCode(HttpStatus.OK)
   @ApiOperation({ summary: 'Sign in with user credentials' })
   @ApiResponse({
@@ -42,7 +42,7 @@ export class AuthController {
   }
 
   @Post('/refresh-token')
-  @Throttle({ default: { limit: 10, ttl: 60000 } })
+  @Throttle({ write: { limit: 10, ttl: 60000 } })
   @HttpCode(HttpStatus.OK)
   @ApiOperation({ summary: 'Refresh Auth Token' })
   @ApiResponse({ status: 200, description: 'Successfully refreshed token' })
@@ -97,7 +97,7 @@ export class AuthController {
   }
 
   @Post('/verify-email')
-  @Throttle({ default: { limit: 10, ttl: 60000 } })
+  @Throttle({ write: { limit: 10, ttl: 60000 } })
   @HttpCode(HttpStatus.OK)
   @ApiOperation({
     summary: 'Verify email with one-time token from signup mail',
@@ -113,7 +113,7 @@ export class AuthController {
   }
 
   @Post('/resend-verification')
-  @Throttle({ default: { limit: 3, ttl: 60000 } })
+  @Throttle({ write: { limit: 3, ttl: 60000 } })
   @HttpCode(HttpStatus.OK)
   @ApiOperation({ summary: 'Resend the email verification mail' })
   @ApiResponse({

meridian-api/src/common/guards/custom-throttler.guard.ts

@@ -0,0 +1,27 @@
+import { ExecutionContext, Injectable } from '@nestjs/common';
+import { ThrottlerGuard } from '@nestjs/throttler';
+
+@Injectable()
+export class CustomThrottlerGuard extends ThrottlerGuard {
+  protected async handleRequest(
+    requestProps: any,
+  ): Promise<boolean> {
+    const { context, throttler } = requestProps;
+
+    const req = context.switchToHttp().getRequest();
+    const isWrite = ['POST', 'PUT', 'PATCH', 'DELETE'].includes(req.method);
+    const throttlerName = throttler.name || 'default';
+
+    // If it's a read request, ignore the "write" throttler
+    if (!isWrite && throttlerName === 'write') {
+      return true;
+    }
+
+    // If it's a write request, ignore the "read" throttler
+    if (isWrite && throttlerName === 'read') {
+      return true;
+    }
+
+    return super.handleRequest(requestProps);
+  }
+}

meridian-api/src/health/health.controller.ts

@@ -1,4 +1,5 @@
 import { Controller, Get } from '@nestjs/common';
+import { SkipThrottle } from '@nestjs/throttler';
 import {
   HealthCheckService,
   HealthCheck,
@@ -8,6 +9,7 @@ import {
 } from '@nestjs/terminus';
 import { ApiTags, ApiOperation } from '@nestjs/swagger';
 
+@SkipThrottle()
 @ApiTags('Health')
 @Controller('health')
 export class HealthController {