managarten/services/mana-api-gateway/CLAUDE.md

Mana API Gateway

Custom NestJS API Gateway for monetizing ManaCore services (mana-search, mana-stt, mana-tts).

Overview

• Port: 3030
• Technology: NestJS 10 + Drizzle ORM + Redis
• Purpose: API Key Management, Usage Tracking, Rate Limiting, Credit-based Billing

Architecture

                        ┌─────────────────────────┐
                        │     API Gateway         │
                        │      (Port 3030)        │
                        │                         │
    Clients ───────────>│  • API Key Validation   │
    (X-API-Key Header)  │  • Rate Limiting        │
                        │  • Usage Tracking       │
                        │  • Credit Deduction     │
                        └───────────┬─────────────┘
                                    │
              ┌─────────────────────┼─────────────────────┐
              │                     │                     │
              ▼                     ▼                     ▼
      ┌───────────────┐     ┌───────────────┐     ┌───────────────┐
      │  mana-search  │     │   mana-stt    │     │   mana-tts    │
      │  (Port 3021)  │     │  (Port 3020)  │     │  (Port 3022)  │
      └───────────────┘     └───────────────┘     └───────────────┘

Quick Start

Development

# Install dependencies
pnpm install

# Push database schema
pnpm db:push

# Start in development mode
pnpm dev

Production

# Build
pnpm build

# Start
pnpm start

API Endpoints

Public API (with API Key)

Method	Endpoint	Description	Credits
POST	/v1/search	Web search	1
POST	/v1/extract	Content extraction	1
POST	/v1/extract/bulk	Bulk extraction	1 per URL
GET	/v1/search/engines	Available search engines	0
POST	/v1/stt/transcribe	Audio → Text	10/min
GET	/v1/stt/models	Available STT models	0
GET	/v1/stt/languages	Supported languages	0
POST	/v1/tts/synthesize	Text → Audio	1/1000 chars
GET	/v1/tts/voices	Available voices	0
GET	/v1/tts/languages	Supported languages	0

Management API (with JWT)

Method	Endpoint	Description
POST	/api-keys	Create new API key
GET	/api-keys	List all API keys
GET	/api-keys/:id	Get API key details
PATCH	/api-keys/:id	Update API key
DELETE	/api-keys/:id	Delete API key
POST	/api-keys/:id/regenerate	Regenerate API key
GET	/api-keys/:id/usage	Get usage statistics
GET	/api-keys/:id/usage/summary	Get usage summary

System

Method	Endpoint	Description
GET	/health	Health check
GET	/metrics	Prometheus metrics

Pricing Tiers

Tier	Rate Limit	Monthly Credits	Endpoints	Price
Free	10 req/min	100	Search only	Free
Pro	100 req/min	5,000	All	€19/month
Enterprise	1,000 req/min	50,000	All	€99/month

Credit Costs

Operation	Cost
Search	1 credit
Extract	1 credit
STT	10 credits/minute
TTS	1 credit/1000 chars

Usage Examples

Create an API Key

# First, get a JWT token from mana-core-auth
TOKEN=$(curl -s -X POST http://localhost:3001/api/v1/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email": "user@example.com", "password": "password"}' | jq -r '.accessToken')

# Create an API key
curl -X POST http://localhost:3030/api-keys \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name": "My API Key", "tier": "free"}'

Use the API

# Search
curl -X POST http://localhost:3030/v1/search \
  -H "X-API-Key: sk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{"query": "quantum computing"}'

# Extract content
curl -X POST http://localhost:3030/v1/extract \
  -H "X-API-Key: sk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com/article"}'

# Text-to-Speech
curl -X POST http://localhost:3030/v1/tts/synthesize \
  -H "X-API-Key: sk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello, world!", "voice": "en-US-1"}' \
  --output audio.mp3

# Speech-to-Text
curl -X POST http://localhost:3030/v1/stt/transcribe \
  -H "X-API-Key: sk_live_xxx" \
  -F "file=@audio.wav"

Check Usage

curl http://localhost:3030/api-keys/{id}/usage \
  -H "Authorization: Bearer $TOKEN"

Environment Variables

Variable	Default	Description
PORT	3030	API port
DATABASE_URL	-	PostgreSQL connection URL
REDIS_HOST	localhost	Redis host
REDIS_PORT	6379	Redis port
SEARCH_SERVICE_URL	http://localhost:3021	mana-search URL
STT_SERVICE_URL	http://localhost:3020	mana-stt URL
TTS_SERVICE_URL	http://localhost:3022	mana-tts URL
MANA_CORE_AUTH_URL	http://localhost:3001	Auth service URL

Development Commands

# Install dependencies
pnpm install

# Start development server
pnpm dev

# Build for production
pnpm build

# Start production server
pnpm start

# Type checking
pnpm type-check

# Linting
pnpm lint

# Database commands
pnpm db:push       # Push schema to database
pnpm db:generate   # Generate migrations
pnpm db:migrate    # Run migrations
pnpm db:studio     # Open Drizzle Studio

Database Schema

The gateway uses its own schema (api_gateway) in the shared ManaCore database:

• api_gateway.api_keys - API key storage and configuration
• api_gateway.api_usage - Detailed usage logs
• api_gateway.api_usage_daily - Aggregated daily usage for billing

Rate Limiting

Rate limiting uses Redis with a sliding window algorithm:

• Each API key has a configurable rate limit (requests per minute)
• Rate limit headers are included in responses:
  • X-RateLimit-Limit - Maximum requests per minute
  • X-RateLimit-Remaining - Remaining requests
  • X-RateLimit-Reset - Unix timestamp when limit resets

Authentication

Two types of authentication:

1. X-API-Key header - For public API endpoints (/v1/*)
2. Bearer JWT token - For management endpoints (/api-keys/*)

The JWT token is validated against mana-core-auth service.

Project Structure

services/mana-api-gateway/
├── src/
│   ├── main.ts                 # Application entry point
│   ├── app.module.ts           # Root module
│   ├── config/
│   │   ├── configuration.ts    # App configuration
│   │   └── pricing.ts          # Pricing tiers and credit costs
│   ├── db/
│   │   ├── schema/             # Drizzle schemas
│   │   ├── database.module.ts  # Database provider
│   │   ├── connection.ts       # DB connection
│   │   └── migrate.ts          # Migration script
│   ├── api-keys/               # API key management
│   ├── usage/                  # Usage tracking
│   ├── proxy/                  # Proxy services to backends
│   ├── guards/                 # Auth, rate limit, credits guards
│   ├── common/                 # Decorators, filters, interceptors
│   ├── credits/                # Credits service (mana-core-auth client)
│   ├── metrics/                # Prometheus metrics
│   └── health/                 # Health check endpoint
├── drizzle.config.ts           # Drizzle Kit configuration
├── package.json
├── tsconfig.json
└── Dockerfile

Troubleshooting

API Key not working

1. Check the key is valid: curl -H "X-API-Key: $KEY" http://localhost:3030/health
2. Check the key is active in the database
3. Check the key hasn't expired
4. Check the endpoint is allowed for the key's tier

Rate limit exceeded

Wait for the X-RateLimit-Reset timestamp, or upgrade to a higher tier.

Credits exhausted

Check usage with the management API, or wait for monthly reset.