Added new feature for document export

2026-03-10 16:25:05 -05:00
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+# Quickstart Guide: Google Drive HTTP Proxy Adapter
+
+**Feature**: 001-drive-proxy-adapter  
+**Date**: 2026-03-07  
+**Version**: 1.0.0
+
+---
+
+## Overview
+
+The Google Drive HTTP Proxy Adapter is a Node.js application that generates XML sitemaps of Google Drive documents. It provides a single HTTP endpoint (`/sitemap.xml`) that queries the Google Drive API and returns a sitemap listing all accessible documents with links in RESTful format.
+
+**Key Features**:
+- Service Account authentication (JWT-based, no user interaction)
+- Sitemap protocol compliant (50,000 URL limit enforced)
+- FIFO request queuing (sequential processing)
+- Configurable Drive API filters
+- Plain text logging to stdout/stderr
+
+---
+
+## Prerequisites
+
+1. **Node.js**: v18.0.0 or later (LTS version recommended)
+2. **Google Cloud Project**: With Drive API enabled
+3. **Service Account**: JSON key file with Drive API access
+4. **Network Access**: Connectivity to googleapis.com
+
+---
+
+## Installation
+
+### 1. Clone Repository
+
+```bash
+git clone <repository-url>
+cd google-drive-content-adapter
+```
+
+### 2. Install Dependencies
+
+```bash
+npm install
+```
+
+**Dependencies**:
+- `googleapis@^140.0.0` - Official Google API client for Node.js
+
+---
+
+## Configuration
+
+### 1. Service Account Setup
+
+**Create Service Account** (Google Cloud Console):
+1. Navigate to [IAM & Admin > Service Accounts](https://console.cloud.google.com/iam-admin/serviceaccounts)
+2. Click "Create Service Account"
+3. Name: `drive-sitemap-adapter` (or your choice)
+4. Grant role: None required if accessing service account's own Drive
+5. Click "Create Key" → Choose JSON format → Download key file
+
+**Enable Drive API**:
+1. Navigate to [APIs & Services > Library](https://console.cloud.google.com/apis/library)
+2. Search for "Google Drive API"
+3. Click "Enable"
+
+**Grant Access** (if accessing user drives):
+- Share Drive folders/files with Service Account email (`xxx@project.iam.gserviceaccount.com`)
+- OR configure domain-wide delegation (for G Suite organizations)
+
+---
+
+### 2. Environment Variables
+
+Create `.env` file in project root (or set environment variables):
+
+```bash
+# REQUIRED: Service Account credentials (inline JSON)
+GOOGLE_SERVICE_ACCOUNT_KEY='{"type":"service_account","project_id":"your-project","private_key_id":"...","private_key":"-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n","client_email":"xxx@project.iam.gserviceaccount.com","client_id":"...","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://oauth2.googleapis.com/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_x509_cert_url":"..."}'
+
+# OPTIONAL: Server configuration
+PORT=3000                                    # Default: 3000
+BASE_URL=http://localhost:3000               # Default: http://localhost:3000
+
+# OPTIONAL: Drive API query filter
+DRIVE_QUERY="trashed = false"                # Default: "trashed = false"
+```
+
+**Important Notes**:
+- `GOOGLE_SERVICE_ACCOUNT_KEY` must be a single-line JSON string (escape newlines in private_key)
+- `BASE_URL` should match your production domain for sitemap URLs
+- `DRIVE_QUERY` supports Drive API query syntax ([docs](https://developers.google.com/drive/api/guides/search-files))
+
+---
+
+### 3. Configuration Files
+
+**config/config.js**: Server settings (auto-generated from env vars)
+```javascript
+export default {
+  server: {
+    port: process.env.PORT || 3000,
+    baseUrl: process.env.BASE_URL || 'http://localhost:3000'
+  }
+};
+```
+
+**config/settings.js**: Drive API configuration
+```javascript
+export default {
+  drive: {
+    query: process.env.DRIVE_QUERY || "trashed = false",
+    fields: 'files(id, name, mimeType, modifiedTime)',
+    pageSize: 1000,
+    scope: 'https://www.googleapis.com/auth/drive.readonly'
+  }
+};
+```
+
+**To customize Drive API filter**, edit `config/settings.js` or set `DRIVE_QUERY` env var.
+
+---
+
+## Usage
+
+### Start Server (Development)
+
+```bash
+npm run dev
+```
+
+**Output**:
+```
+[2026-03-07T10:00:00.000Z] [INFO] Server configuration loaded: port=3000, baseUrl=http://localhost:3000
+[2026-03-07T10:00:00.100Z] [INFO] Service Account authenticated: xxx***@project.iam.gserviceaccount.com
+[2026-03-07T10:00:00.200Z] [INFO] HTTP server listening on port 3000
+```
+
+---
+
+### Start Server (Production)
+
+```bash
+npm start
+```
+
+---
+
+### Request Sitemap
+
+**Using curl**:
+```bash
+curl http://localhost:3000/sitemap.xml
+```
+
+**Expected Response** (200 OK):
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>http://localhost:3000/documents/1A2B3C4D5E6F7G8H</loc>
+    <lastmod>2026-03-07</lastmod>
+  </url>
+  <url>
+    <loc>http://localhost:3000/documents/9I0J1K2L3M4N5O6P</loc>
+    <lastmod>2026-03-05</lastmod>
+  </url>
+</urlset>
+```
+
+---
+
+## Testing
+
+### Run All Tests
+
+```bash
+npm test
+```
+
+**Test Suites**:
+- `tests/unit/` - Unit tests for Drive client, auth, sitemap generator, queue
+- `tests/integration/` - End-to-end endpoint tests for /sitemap.xml
+- `tests/contract/` - XML sitemap schema validation tests
+
+---
+
+### Run Specific Test Suite
+
+```bash
+npm run test:unit          # Unit tests only
+npm run test:integration   # Integration tests only
+npm run test:contract      # Contract tests only
+```
+
+---
+
+## API Reference
+
+### Endpoint: `GET /sitemap.xml`
+
+**Description**: Generate XML sitemap of all accessible Google Drive documents.
+
+**Request**:
+```http
+GET /sitemap.xml HTTP/1.1
+Host: example.com
+```
+
+**Success Response** (200 OK):
+```http
+HTTP/1.1 200 OK
+Content-Type: application/xml; charset=utf-8
+Content-Length: {size}
+
+```
+
+**Error Responses**:
+- `404 Not Found` - Invalid endpoint (only /sitemap.xml supported)
+- `413 Payload Too Large` - More than 50,000 documents in Drive
+- `429 Too Many Requests` - Rate limit exceeded (includes `Retry-After` header)
+- `401 Unauthorized` - Authentication failed
+- `503 Service Unavailable` - Drive API unavailable
+- `500 Internal Server Error` - Unexpected error
+
+**Note**: All error responses have **empty body** (status code only).
+
+See [contracts/sitemap-xml-schema.md](./contracts/sitemap-xml-schema.md) for full API contract.
+
+---
+
+## Architecture
+
+### Project Structure
+
+```
+google-drive-content-adapter/
+├── src/
+│   ├── server.js        # HTTP server entry point
+│   ├── proxy.js         # Monolithic route handler (sitemap logic)
+│   ├── logger.js        # Logging module (console.js alias)
+│   ├── auth.js          # Service Account JWT authentication
+│   └── xml-utils.js     # XML generation utilities
+├── config/
+│   ├── config.js        # Server configuration (port, baseUrl)
+│   └── settings.js      # Drive API filter configuration
+├── tests/
+│   ├── unit/            # Unit tests
+│   ├── integration/     # Integration tests
+│   └── contract/        # Contract tests
+├── specs/               # Feature specifications and planning docs
+│   └── 001-drive-proxy-adapter/
+│       ├── spec.md
+│       ├── plan.md
+│       ├── research.md
+│       ├── data-model.md
+│       ├── quickstart.md (this file)
+│       └── contracts/
+│           └── sitemap-xml-schema.md
+├── package.json
+└── README.md
+```
+
+---
+
+### Request Flow
+
+```
+1. Client → GET /sitemap.xml
+2. Server → Create RequestContext (ID, timestamp)
+3. Server → Enqueue request (FIFO queue)
+4. Queue → Process request (sequential, one at a time)
+5. Proxy → Authenticate with Service Account JWT
+6. Proxy → Query Drive API files.list() (paginate if >1000 docs)
+7. Proxy → Check count ≤ 50,000
+8. Proxy → Transform Documents to SitemapEntries
+9. Proxy → Generate XML sitemap
+10. Server → Return 200 + XML (or error status)
+11. Queue → Process next request
+```
+
+---
+
+## Troubleshooting
+
+### 1. Fatal Error: Invalid Service Account Credentials
+
+**Error**:
+```
+[2026-03-07T10:00:00.000Z] [ERROR] FATAL: Invalid client_email in Service Account credentials
+```
+
+**Solution**:
+- Check `GOOGLE_SERVICE_ACCOUNT_KEY` env var is valid JSON
+- Ensure `client_email` field ends with `.gserviceaccount.com`
+- Ensure `private_key` field starts with `-----BEGIN PRIVATE KEY-----`
+- Verify no extra escaping/quotes in JSON string
+
+---
+
+### 2. Fatal Error: Port Already in Use
+
+**Error**:
+```
+[2026-03-07T10:00:00.000Z] [ERROR] FATAL: Unable to bind to port 3000 (EADDRINUSE)
+```
+
+**Solution**:
+- Change `PORT` env var to different port (e.g., 8080)
+- OR stop other process using port 3000: `lsof -ti:3000 | xargs kill`
+
+---
+
+### 3. 401 Unauthorized Response
+
+**Cause**: Service Account token refresh failed
+
+**Solution**:
+- Verify Service Account has Drive API access (share folders with service account email)
+- Check Drive API is enabled in Google Cloud Console
+- Ensure scope is correct: `https://www.googleapis.com/auth/drive.readonly`
+
+---
+
+### 4. 413 Payload Too Large Response
+
+**Cause**: Google Drive contains more than 50,000 documents
+
+**Solution**:
+- Adjust `DRIVE_QUERY` to filter documents (e.g., by folder, date, file type)
+- Example: `DRIVE_QUERY="'folder-id' in parents and trashed = false"`
+
+---
+
+### 5. 429 Too Many Requests Response
+
+**Cause**: Drive API rate limit exceeded
+
+**Solution**:
+- Wait for time specified in `Retry-After` response header (seconds)
+- Reduce request frequency
+- Consider Drive API quota limits ([docs](https://developers.google.com/drive/api/guides/limits))
+
+---
+
+### 6. 503 Service Unavailable Response
+
+**Cause**: Google Drive API is temporarily unavailable
+
+**Solution**:
+- Wait and retry manually (no automatic retries per spec)
+- Check [Google Workspace Status Dashboard](https://www.google.com/appsstatus)
+
+---
+
+## Performance Tips
+
+### 1. Optimize Drive Query Filter
+
+**Default** (all files):
+```javascript
+DRIVE_QUERY="trashed = false"
+```
+
+**Filter by folder**:
+```javascript
+DRIVE_QUERY="'folder-id' in parents and trashed = false"
+```
+
+**Filter by date**:
+```javascript
+DRIVE_QUERY="modifiedTime > '2026-01-01T00:00:00' and trashed = false"
+```
+
+**Filter by MIME type**:
+```javascript
+DRIVE_QUERY="mimeType = 'application/pdf' and trashed = false"
+```
+
+See [Drive API search query syntax](https://developers.google.com/drive/api/guides/search-files) for more options.
+
+---
+
+### 2. Adjust BASE_URL for Production
+
+**Development**:
+```
+BASE_URL=http://localhost:3000
+```
+
+**Production**:
+```
+BASE_URL=https://your-domain.com
+```
+
+This ensures sitemap URLs point to the correct domain.
+
+---
+
+### 3. Monitor Memory Usage
+
+**Check memory usage** (production):
+```bash
+node --inspect src/server.js
+# Open chrome://inspect in Chrome DevTools
+```
+
+**Expected**: <256MB under normal load (<10 concurrent requests)
+
+---
+
+## Security Best Practices
+
+1. **Never commit** Service Account JSON key file to version control
+2. **Use environment variables** for all sensitive configuration
+3. **Restrict Service Account permissions** to minimum required (readonly scope)
+4. **Monitor logs** for unauthorized access attempts
+5. **Use HTTPS** in production (configure reverse proxy like nginx)
+6. **Filter credentials from logs** (private_key field never logged)
+
+---
+
+## Deployment
+
+### Docker (Recommended)
+
+**Dockerfile**:
+```dockerfile
+FROM node:18-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --only=production
+COPY . .
+EXPOSE 3000
+CMD ["npm", "start"]
+```
+
+**Build and run**:
+```bash
+docker build -t drive-sitemap-adapter .
+docker run -p 3000:3000 \
+  -e GOOGLE_SERVICE_ACCOUNT_KEY='{"type":"service_account",...}' \
+  -e BASE_URL=https://your-domain.com \
+  drive-sitemap-adapter
+```
+
+---
+
+### Cloud Platforms
+
+**Google Cloud Run**:
+```bash
+gcloud run deploy drive-sitemap-adapter \
+  --source . \
+  --set-env-vars BASE_URL=https://your-domain.com \
+  --set-secrets GOOGLE_SERVICE_ACCOUNT_KEY=service-account-key:latest
+```
+
+**AWS ECS / Fargate**: Use environment variables in task definition
+
+**Heroku**: Set environment variables via Heroku CLI or dashboard
+
+---
+
+## Additional Resources
+
+- **Feature Specification**: [specs/001-drive-proxy-adapter/spec.md](./spec.md)
+- **Implementation Plan**: [specs/001-drive-proxy-adapter/plan.md](./plan.md)
+- **Research Document**: [specs/001-drive-proxy-adapter/research.md](./research.md)
+- **Data Model**: [specs/001-drive-proxy-adapter/data-model.md](./data-model.md)
+- **API Contract**: [specs/001-drive-proxy-adapter/contracts/sitemap-xml-schema.md](./contracts/sitemap-xml-schema.md)
+- **Google Drive API Docs**: [https://developers.google.com/drive/api/v3/reference](https://developers.google.com/drive/api/v3/reference)
+- **Sitemap Protocol**: [https://www.sitemaps.org/protocol.html](https://www.sitemaps.org/protocol.html)
+
+---
+
+## Support
+
+For issues or questions, refer to:
+1. This quickstart guide
+2. Feature specification (spec.md) for requirements
+3. Research document (research.md) for technical decisions
+4. Contract documentation (contracts/) for API details
+
+---
+
+## Version History
+
+| Version | Date | Changes |
+|---------|------|---------|
+| 1.0.0 | 2026-03-07 | Initial quickstart guide |
+
+| Version | Date | Changes |
+|---------|------|---------|
+| 1.0.0 | 2026-03-07 | Initial quickstart guide |