Add OAuth2/OIDC integration preparation documentation

- Add OAUTH2-README.md: Overview and navigation guide - Add OAUTH2-QUICK-START.md: 15-minute setup guide with code examples - Add OAUTH2-OIDC-INTEGRATION-PREP.md: Complete 60-page implementation guide Documentation covers: - 6-phase implementation plan (6 weeks) - Integration with OBP-OIDC provider - Reference implementation from OBP-Portal - Complete code examples for all components - Testing strategy and deployment guide - Backward compatibility with OAuth 1.0a
2026-02-06 02:36:46 +00:00 · 2025-11-29 19:48:30 +01:00 · 2025-11-29 19:48:30 +01:00 · ba783c0f22
commit ba783c0f22
parent 2cbc48135f
3 changed files with 3286 additions and 0 deletions
--- a/OAUTH2-OIDC-INTEGRATION-PREP.md
+++ b/OAUTH2-OIDC-INTEGRATION-PREP.md
--- a/OAUTH2-QUICK-START.md
+++ b/OAUTH2-QUICK-START.md
@ -0,0 +1,508 @@
+# OAuth2/OIDC Quick Start Guide
+## API Explorer II Integration with OBP-OIDC
+
+**Quick reference for developers getting started with OAuth2/OIDC integration**
+
+---
+
+## 🚀 Quick Setup (15 minutes)
+
+### Step 1: Set Up OBP-OIDC (5 minutes)
+
+```bash
+# Navigate to OBP-OIDC directory
+cd ~/Documents/workspace_2024/OBP-OIDC
+
+# Copy example configuration
+cp run-server.example.sh run-server.sh
+
+# Edit database credentials (IMPORTANT!)
+vim run-server.sh
+# Update: DB_HOST, DB_PORT, DB_NAME, OIDC_USER_PASSWORD, OIDC_ADMIN_PASSWORD
+
+# Start the OIDC server
+./run-server.sh
+```
+
+**Verify it's running:**
+```bash
+curl http://localhost:9000/obp-oidc/.well-known/openid-configuration
+```
+
+### Step 2: Configure API Explorer II (5 minutes)
+
+```bash
+# Navigate to API Explorer II
+cd ~/Documents/workspace_2024/API-Explorer-II
+
+# Install new dependencies
+npm install arctic jsonwebtoken @types/jsonwebtoken
+
+# Update .env file
+cat >> .env << EOF
+
+# OAuth2/OIDC Configuration
+VITE_USE_OAUTH2=true
+VITE_OBP_OAUTH2_CLIENT_ID=obp-explorer-ii-client
+VITE_OBP_OAUTH2_CLIENT_SECRET=CHANGE_THIS_TO_EXPLORER_SECRET_2024
+VITE_OBP_OAUTH2_REDIRECT_URL=http://localhost:5173/oauth2/callback
+VITE_OBP_OAUTH2_WELL_KNOWN_URL=http://127.0.0.1:9000/obp-oidc/.well-known/openid-configuration
+EOF
+```
+
+**Note:** The client secret above matches the default in OBP-OIDC's `run-server.sh`. Change it to your actual secret.
+
+### Step 3: Verify Prerequisites (2 minutes)
+
+```bash
+# Check Redis is running
+redis-cli ping
+# Expected output: PONG
+
+# Check OBP-API is running
+curl http://localhost:8080/obp/v5.1.0/root
+# Expected: JSON response
+
+# Check Node version
+node --version
+# Expected: v16.14.0 or higher
+```
+
+### Step 4: Test the Setup (3 minutes)
+
+```bash
+# Start API Explorer II
+npm run dev
+
+# Open browser to http://localhost:5173
+# Click "Login" button
+# Should redirect to OBP-OIDC login page
+```
+
+**Test credentials** (default OBP-OIDC users):
+- Username: `user@example.com`
+- Password: (check your OBP database)
+
+---
+
+## 📋 Implementation Checklist
+
+Use this checklist to track your implementation progress:
+
+### Phase 1: Backend Core
+- [ ] Create `server/utils/pkce.ts`
+- [ ] Create `server/services/OAuth2Service.ts`
+- [ ] Create `server/middlewares/OAuth2AuthorizationMiddleware.ts`
+- [ ] Create `server/middlewares/OAuth2CallbackMiddleware.ts`
+- [ ] Create `server/controllers/OAuth2ConnectController.ts`
+- [ ] Create `server/controllers/OAuth2CallbackController.ts`
+- [ ] Update `server/app.ts` to initialize OAuth2Service
+
+### Phase 2: User Management
+- [ ] Update `server/controllers/UserController.ts` getCurrentUser()
+- [ ] Update `server/controllers/UserController.ts` logoff()
+- [ ] Support both OAuth 1.0a and OAuth2 sessions
+
+### Phase 3: Frontend
+- [ ] Update `src/components/HeaderNav.vue` login button
+- [ ] Update `src/components/HeaderNav.vue` logout button
+- [ ] Add OAuth2 status indicator (optional)
+
+### Phase 4: Testing
+- [ ] Write unit tests for PKCE utilities
+- [ ] Write unit tests for OAuth2Service
+- [ ] Write integration tests for login flow
+- [ ] Manual testing of full authentication flow
+
+### Phase 5: Documentation
+- [ ] Update README.md
+- [ ] Create migration guide
+- [ ] Create troubleshooting guide
+
+---
+
+## 🔑 Key Files to Create
+
+### 1. PKCE Utilities (`server/utils/pkce.ts`)
+
+```typescript
+import crypto from 'crypto'
+
+export class PKCEUtils {
+  static generateCodeVerifier(): string {
+    return crypto.randomBytes(32).toString('base64url')
+  }
+
+  static generateCodeChallenge(verifier: string): string {
+    return crypto.createHash('sha256').update(verifier).digest('base64url')
+  }
+
+  static generateState(): string {
+    return crypto.randomBytes(32).toString('hex')
+  }
+}
+```
+
+### 2. OAuth2 Service (`server/services/OAuth2Service.ts`)
+
+```typescript
+import { OAuth2Client } from 'arctic'
+import { Service } from 'typedi'
+
+export interface OIDCConfiguration {
+  issuer: string
+  authorization_endpoint: string
+  token_endpoint: string
+  userinfo_endpoint: string
+  jwks_uri: string
+}
+
+@Service()
+export class OAuth2Service {
+  private client: OAuth2Client
+  private oidcConfig: OIDCConfiguration | null = null
+
+  constructor() {
+    const clientId = process.env.VITE_OBP_OAUTH2_CLIENT_ID
+    const clientSecret = process.env.VITE_OBP_OAUTH2_CLIENT_SECRET
+    const redirectUri = process.env.VITE_OBP_OAUTH2_REDIRECT_URL
+
+    if (!clientId || !clientSecret || !redirectUri) {
+      throw new Error('OAuth2 configuration incomplete')
+    }
+
+    this.client = new OAuth2Client(clientId, clientSecret, redirectUri)
+  }
+
+  async initializeFromWellKnown(wellKnownUrl: string): Promise<void> {
+    const response = await fetch(wellKnownUrl)
+    if (!response.ok) {
+      throw new Error(`Failed to fetch OIDC config: ${response.statusText}`)
+    }
+    this.oidcConfig = await response.json()
+  }
+
+  createAuthorizationURL(state: string, scopes: string[] = ['openid', 'profile', 'email']): URL {
+    if (!this.oidcConfig) {
+      throw new Error('OIDC configuration not initialized')
+    }
+    return this.client.createAuthorizationURL(this.oidcConfig.authorization_endpoint, state, scopes)
+  }
+
+  async exchangeCodeForTokens(code: string, codeVerifier: string): Promise<any> {
+    if (!this.oidcConfig) {
+      throw new Error('OIDC configuration not initialized')
+    }
+    return await this.client.validateAuthorizationCode(
+      this.oidcConfig.token_endpoint,
+      code,
+      codeVerifier
+    )
+  }
+
+  async getUserInfo(accessToken: string): Promise<any> {
+    if (!this.oidcConfig) {
+      throw new Error('OIDC configuration not initialized')
+    }
+    const response = await fetch(this.oidcConfig.userinfo_endpoint, {
+      headers: { Authorization: `Bearer ${accessToken}` }
+    })
+    if (!response.ok) {
+      throw new Error(`UserInfo request failed: ${response.statusText}`)
+    }
+    return await response.json()
+  }
+}
+```
+
+### 3. Authorization Middleware (`server/middlewares/OAuth2AuthorizationMiddleware.ts`)
+
+```typescript
+import { ExpressMiddlewareInterface } from 'routing-controllers'
+import { Request, Response } from 'express'
+import { Service } from 'typedi'
+import { OAuth2Service } from '../services/OAuth2Service'
+import { PKCEUtils } from '../utils/pkce'
+
+@Service()
+export default class OAuth2AuthorizationMiddleware implements ExpressMiddlewareInterface {
+  constructor(private oauth2Service: OAuth2Service) {}
+
+  async use(request: Request, response: Response): Promise<void> {
+    const session = request.session
+    const redirectPage = request.query.redirect
+
+    if (redirectPage) {
+      session['redirectPage'] = redirectPage
+    }
+
+    // Generate PKCE parameters
+    const codeVerifier = PKCEUtils.generateCodeVerifier()
+    const codeChallenge = PKCEUtils.generateCodeChallenge(codeVerifier)
+    const state = PKCEUtils.generateState()
+
+    // Store in session
+    session['oauth2_state'] = state
+    session['oauth2_code_verifier'] = codeVerifier
+
+    // Create authorization URL
+    const authUrl = this.oauth2Service.createAuthorizationURL(state)
+    authUrl.searchParams.set('code_challenge', codeChallenge)
+    authUrl.searchParams.set('code_challenge_method', 'S256')
+
+    console.log('OAuth2: Redirecting to authorization endpoint')
+    response.redirect(authUrl.toString())
+  }
+}
+```
+
+### 4. Callback Middleware (`server/middlewares/OAuth2CallbackMiddleware.ts`)
+
+```typescript
+import { ExpressMiddlewareInterface } from 'routing-controllers'
+import { Request, Response } from 'express'
+import { Service } from 'typedi'
+import { OAuth2Service } from '../services/OAuth2Service'
+import jwt from 'jsonwebtoken'
+
+@Service()
+export default class OAuth2CallbackMiddleware implements ExpressMiddlewareInterface {
+  constructor(private oauth2Service: OAuth2Service) {}
+
+  async use(request: Request, response: Response): Promise<void> {
+    const session = request.session
+    const code = request.query.code as string
+    const state = request.query.state as string
+
+    // Validate state
+    if (!state || state !== session['oauth2_state']) {
+      console.error('OAuth2: State validation failed')
+      return response.status(400).send('Invalid state parameter')
+    }
+
+    // Get code verifier
+    const codeVerifier = session['oauth2_code_verifier']
+    if (!codeVerifier) {
+      console.error('OAuth2: Code verifier not found')
+      return response.status(400).send('Invalid session state')
+    }
+
+    try {
+      // Exchange code for tokens
+      const tokens = await this.oauth2Service.exchangeCodeForTokens(code, codeVerifier)
+
+      // Get user info
+      const userInfo = await this.oauth2Service.getUserInfo(tokens.accessToken())
+
+      // Store in session
+      session['oauth2_access_token'] = tokens.accessToken()
+      session['oauth2_refresh_token'] = tokens.refreshToken?.() || null
+      session['oauth2_id_token'] = tokens.idToken?.() || null
+      session['oauth2_user_info'] = userInfo
+
+      // Decode ID token
+      const idToken = tokens.idToken?.()
+      if (idToken) {
+        const decoded: any = jwt.decode(idToken)
+        session['oauth2_user'] = {
+          sub: decoded.sub,
+          email: decoded.email,
+          name: decoded.name,
+          username: decoded.preferred_username || decoded.sub
+        }
+      }
+
+      // Clear flow parameters
+      delete session['oauth2_state']
+      delete session['oauth2_code_verifier']
+
+      // Redirect
+      const redirectPage = session['redirectPage'] || process.env.VITE_OBP_API_EXPLORER_HOST
+      delete session['redirectPage']
+
+      console.log('OAuth2: Authentication successful')
+      response.redirect(redirectPage as string)
+    } catch (error: any) {
+      console.error('OAuth2: Token exchange failed:', error)
+      response.status(500).send('Authentication failed: ' + error.message)
+    }
+  }
+}
+```
+
+---
+
+## 🧪 Testing Your Implementation
+
+### Manual Testing Flow
+
+1. **Start all services:**
+   ```bash
+   # Terminal 1: OBP-OIDC
+   cd ~/Documents/workspace_2024/OBP-OIDC
+   ./run-server.sh
+
+   # Terminal 2: Redis
+   redis-server
+
+   # Terminal 3: API Explorer II
+   cd ~/Documents/workspace_2024/API-Explorer-II
+   npm run dev
+   ```
+
+2. **Test login flow:**
+   - Open http://localhost:5173
+   - Click "Login" button
+   - Should redirect to http://localhost:9000/obp-oidc/auth
+   - Enter credentials
+   - Should redirect back to http://localhost:5173
+   - Username should appear in header
+
+3. **Test session persistence:**
+   - Refresh the page
+   - Should remain logged in
+   - Username still visible
+
+4. **Test logout:**
+   - Click "Logout" button
+   - Should redirect to home
+   - No longer authenticated
+
+### Debugging Tips
+
+**Enable debug logging:**
+```bash
+DEBUG=express-session npm run dev
+```
+
+**Check session in Redis:**
+```bash
+redis-cli
+> KEYS sess:*
+> GET sess:<your_session_id>
+```
+
+**Check OIDC configuration:**
+```bash
+curl http://localhost:9000/obp-oidc/.well-known/openid-configuration | jq
+```
+
+**Monitor logs:**
+- Watch server console for "OAuth2:" prefixed messages
+- Watch browser console for errors
+- Check OBP-OIDC terminal for authentication attempts
+
+---
+
+## 🐛 Common Issues & Solutions
+
+### Issue: "OIDC configuration not initialized"
+**Cause:** Well-known URL not reachable or OAuth2Service not initialized
+
+**Solution:**
+```bash
+# Check OBP-OIDC is running
+curl http://localhost:9000/obp-oidc/.well-known/openid-configuration
+
+# Verify environment variable
+echo $VITE_OBP_OAUTH2_WELL_KNOWN_URL
+
+# Check server logs for initialization error
+```
+
+### Issue: "State validation failed"
+**Cause:** Session not persisting between requests
+
+**Solution:**
+```bash
+# Check Redis is running
+redis-cli ping
+
+# Verify Redis connection in server logs
+# Should see: "Connected to Redis instance: ..."
+
+# Check session cookie in browser DevTools (Application > Cookies)
+```
+
+### Issue: "Code verifier not found in session"
+**Cause:** Session expired or cookie not set
+
+**Solution:**
+- Clear browser cookies
+- Check session timeout settings in `server/app.ts`
+- Verify `VITE_OPB_SERVER_SESSION_PASSWORD` is set
+
+### Issue: "Token request failed: 401"
+**Cause:** Invalid client credentials
+
+**Solution:**
+```bash
+# Verify client credentials match OBP-OIDC configuration
+grep OIDC_CLIENT_EXPLORER ~/Documents/workspace_2024/OBP-OIDC/run-server.sh
+
+# Check credentials in .env
+grep VITE_OBP_OAUTH2 .env
+```
+
+### Issue: Redirect loop
+**Cause:** Cookies not being set properly
+
+**Solution:**
+- Check cookie settings in `server/app.ts`
+- If using nginx, verify `X-Forwarded-Proto` header
+- Set `app.set('trust proxy', 1)` if behind reverse proxy
+
+---
+
+## 📚 Additional Resources
+
+### Full Documentation
+See `OAUTH2-OIDC-INTEGRATION-PREP.md` for:
+- Complete implementation guide
+- Architecture details
+- Production deployment
+- Security considerations
+- Testing strategy
+
+### Reference Implementations
+- **OBP-Portal**: `~/Documents/workspace_2024/OBP-Portal`
+  - `src/lib/oauth/` - OAuth2 implementation
+  - `src/hooks.server.ts` - Server initialization
+- **OBP-OIDC**: `~/Documents/workspace_2024/OBP-OIDC`
+  - `README.md` - OIDC provider documentation
+
+### Standards & Specifications
+- OAuth 2.0: https://oauth.net/2/
+- OpenID Connect: https://openid.net/connect/
+- PKCE: https://oauth.net/2/pkce/
+
+---
+
+## 🎯 Next Steps
+
+After completing the quick start:
+
+1. **Read the full preparation document** (`OAUTH2-OIDC-INTEGRATION-PREP.md`)
+2. **Implement remaining phases** (see Phase 2-6 in main document)
+3. **Write comprehensive tests** (unit, integration, E2E)
+4. **Update documentation** (README, migration guide)
+5. **Plan production deployment** (see deployment section in main doc)
+
+---
+
+## 💡 Tips for Success
+
+1. **Keep OAuth 1.0a working** - Don't remove old code until OAuth2 is stable
+2. **Use feature flags** - `VITE_USE_OAUTH2` allows easy rollback
+3. **Test thoroughly** - OAuth2 flows have many edge cases
+4. **Monitor closely** - Watch logs and metrics during rollout
+5. **Document everything** - Future you will thank present you
+
+---
+
+**Need Help?**
+- Check `OAUTH2-OIDC-INTEGRATION-PREP.md` for detailed guidance
+- Review OBP-Portal reference implementation
+- Ask in #obp-development Slack channel
+
+**Good luck! 🚀**
--- a/OAUTH2-README.md
+++ b/OAUTH2-README.md
@ -0,0 +1,409 @@
+# OAuth2/OIDC Integration Documentation
+## API Explorer II with OBP-OIDC
+
+Welcome! This directory contains comprehensive documentation for integrating OAuth2/OpenID Connect authentication into API Explorer II.
+
+---
+
+## 📚 Documentation Overview
+
+This documentation set guides you through migrating API Explorer II from OAuth 1.0a to OAuth2/OIDC using OBP-OIDC as the identity provider.
+
+### Available Documents
+
+1. **[OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md)** ⭐ **START HERE**
+   - 15-minute setup guide
+   - Quick implementation checklist
+   - Key code snippets
+   - Common troubleshooting
+   - Perfect for: Developers getting started
+
+2. **[OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md)** 📖 **COMPLETE GUIDE**
+   - Full preparation document (60 pages)
+   - Architecture and design decisions
+   - Phase-by-phase implementation plan
+   - Testing strategy
+   - Production deployment guide
+   - Perfect for: Project planning and deep understanding
+
+---
+
+## 🎯 Quick Navigation
+
+### For Developers
+
+**Just getting started?**
+→ Read [OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md)
+
+**Need implementation details?**
+→ See [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 6 (Implementation Phases)
+
+**Having issues?**
+→ Check [OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md) Common Issues section
+→ Or [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Appendix B (Troubleshooting)
+
+### For Project Managers
+
+**Need an overview?**
+→ Read [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 1 (Executive Summary)
+
+**Want timeline?**
+→ See [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 6 (Implementation Phases - 6 weeks)
+
+**Need risk assessment?**
+→ Check [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 12 (Rollback Plan)
+
+### For System Administrators
+
+**Production deployment?**
+→ See [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 11 (Deployment Considerations)
+
+**Configuration needed?**
+→ Check [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Section 8 (Configuration Changes)
+
+**Production readiness?**
+→ Use [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Appendix C (Production Readiness Checklist)
+
+---
+
+## 🚀 Getting Started in 3 Steps
+
+### Step 1: Read the Quick Start (15 min)
+
+```bash
+# Open the quick start guide
+cat OAUTH2-QUICK-START.md
+# Or open in your editor/browser
+```
+
+### Step 2: Set Up OBP-OIDC (5 min)
+
+```bash
+cd ~/Documents/workspace_2024/OBP-OIDC
+cp run-server.example.sh run-server.sh
+# Edit run-server.sh with your database credentials
+./run-server.sh
+```
+
+### Step 3: Configure API Explorer II (5 min)
+
+```bash
+cd ~/Documents/workspace_2024/API-Explorer-II
+npm install arctic jsonwebtoken @types/jsonwebtoken
+
+# Add to .env:
+VITE_USE_OAUTH2=true
+VITE_OBP_OAUTH2_CLIENT_ID=obp-explorer-ii-client
+VITE_OBP_OAUTH2_CLIENT_SECRET=CHANGE_THIS_TO_EXPLORER_SECRET_2024
+VITE_OBP_OAUTH2_REDIRECT_URL=http://localhost:5173/oauth2/callback
+VITE_OBP_OAUTH2_WELL_KNOWN_URL=http://127.0.0.1:9000/obp-oidc/.well-known/openid-configuration
+```
+
+---
+
+## 📋 Implementation Timeline
+
+| Phase | Duration | Description |
+|-------|----------|-------------|
+| **Phase 1** | Week 1 | Preparation & Setup |
+| **Phase 2** | Week 2-3 | Backend OAuth2 Implementation |
+| **Phase 3** | Week 3 | Environment Configuration |
+| **Phase 4** | Week 4 | Frontend Updates |
+| **Phase 5** | Week 5 | Testing |
+| **Phase 6** | Week 6 | Documentation & Migration |
+
+**Total:** 6 weeks for complete implementation and testing
+
+---
+
+## 🎨 Architecture Overview
+
+### Current State (OAuth 1.0a)
+```
+User → Login → OAuth 1.0a Flow → OBP-API → Callback → Session
+```
+
+### Target State (OAuth2/OIDC)
+```
+User → Login → OAuth2 Flow → OBP-OIDC → Token Exchange → Session
+                                ↓
+                            JWT Tokens (Access + Refresh + ID)
+```
+
+### Key Changes
+
+| Aspect | Before (OAuth 1.0a) | After (OAuth2/OIDC) |
+|--------|---------------------|---------------------|
+| **Auth Method** | HMAC-SHA1 signatures | Bearer tokens (JWT) |
+| **Tokens** | Access token + secret | Access + Refresh + ID tokens |
+| **User Info** | API calls | ID token claims |
+| **Refresh** | Not supported | Automatic refresh |
+| **Providers** | Single (OBP-API) | Multiple (OBP-OIDC, Keycloak, etc.) |
+
+---
+
+## 🔑 Key Features
+
+### OAuth2/OIDC Benefits
+
+✅ **Modern Standard** - Industry-standard authentication
+✅ **Better Security** - JWT tokens, PKCE flow, short-lived tokens
+✅ **Auto Refresh** - Seamless token renewal
+✅ **Multi-Provider** - Support for multiple identity providers
+✅ **Better UX** - SSO capabilities, cleaner flow
+✅ **Mobile Ready** - Native OAuth2 support in mobile apps
+
+### Backward Compatibility
+
+✅ **Feature Flag** - Switch between OAuth 1.0a and OAuth2
+✅ **Gradual Migration** - Both methods work simultaneously
+✅ **Easy Rollback** - Revert with a single environment variable
+✅ **No Breaking Changes** - Existing OAuth 1.0a code untouched
+
+---
+
+## 🛠️ Key Components
+
+### Backend (Node.js/Express/TypeScript)
+
+**New Files:**
+- `server/services/OAuth2Service.ts` - OAuth2/OIDC client
+- `server/utils/pkce.ts` - PKCE helper functions
+- `server/middlewares/OAuth2AuthorizationMiddleware.ts`
+- `server/middlewares/OAuth2CallbackMiddleware.ts`
+- `server/controllers/OAuth2ConnectController.ts`
+- `server/controllers/OAuth2CallbackController.ts`
+
+**Modified Files:**
+- `server/app.ts` - Initialize OAuth2Service
+- `server/controllers/UserController.ts` - Support both auth methods
+
+### Frontend (Vue 3)
+
+**Modified Files:**
+- `src/components/HeaderNav.vue` - Dual auth support
+
+### Dependencies
+
+**New:**
+- `arctic` - Modern OAuth2/OIDC client library
+- `jsonwebtoken` - JWT parsing and validation
+
+**Existing:** (no changes)
+- `express`, `express-session`, `connect-redis`, `redis`
+
+---
+
+## 🧪 Testing
+
+### Test Coverage
+
+- **Unit Tests** - PKCE, OAuth2Service, Middlewares
+- **Integration Tests** - Full authentication flow
+- **E2E Tests** - Browser automation with Playwright
+- **Security Tests** - CSRF, XSS, token validation
+- **Performance Tests** - Load testing, benchmarks
+
+### Manual Testing Checklist
+
+- [ ] Login flow (OAuth2)
+- [ ] Logout flow
+- [ ] Token refresh
+- [ ] Session persistence
+- [ ] Error handling
+- [ ] Multiple browsers/devices
+- [ ] Backward compatibility (OAuth 1.0a still works)
+
+---
+
+## 📦 Dependencies
+
+### System Requirements
+
+- **Node.js** >= 16.14
+- **npm** >= 8.0.0
+- **Redis** >= 6.0
+- **PostgreSQL** >= 12 (for OBP database)
+- **Java** 11+ (for OBP-OIDC)
+- **Maven** 3.6+ (for OBP-OIDC)
+
+### NPM Packages (New)
+
+```json
+{
+  "dependencies": {
+    "arctic": "^1.0.0",
+    "jsonwebtoken": "^9.0.2"
+  },
+  "devDependencies": {
+    "@types/jsonwebtoken": "^9.0.6"
+  }
+}
+```
+
+---
+
+## 🔒 Security Considerations
+
+### Implemented Security Measures
+
+✅ **PKCE** - Proof Key for Code Exchange (RFC 7636)
+✅ **State Parameter** - CSRF protection
+✅ **Secure Cookies** - httpOnly, secure flags
+✅ **Token Validation** - JWT signature verification
+✅ **HTTPS Required** - Production deployment
+✅ **Short-lived Tokens** - Access token expiration
+✅ **Refresh Rotation** - Refresh token rotation (if supported by provider)
+
+### Production Security Checklist
+
+- [ ] HTTPS enabled for all endpoints
+- [ ] Client secrets in secure vault
+- [ ] Session secrets strong and rotated
+- [ ] Rate limiting implemented
+- [ ] Audit logging enabled
+- [ ] Security headers configured
+- [ ] CORS properly set up
+
+---
+
+## 🚨 Troubleshooting
+
+### Quick Fixes
+
+**"OIDC configuration not initialized"**
+```bash
+# Check OBP-OIDC is running
+curl http://localhost:9000/obp-oidc/.well-known/openid-configuration
+```
+
+**"State validation failed"**
+```bash
+# Check Redis is running
+redis-cli ping
+# Clear browser cookies and retry
+```
+
+**"Code verifier not found"**
+```bash
+# Check session configuration in server/app.ts
+# Verify Redis connection
+DEBUG=express-session npm run dev
+```
+
+### Getting Help
+
+- 📖 Check [OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md) Common Issues
+- 📖 Read [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) Troubleshooting section
+- 💬 Ask in #obp-development Slack channel
+- 📧 Email: dev@tesobe.com
+
+---
+
+## 🎓 Learning Resources
+
+### OAuth2/OIDC Standards
+
+- **OAuth 2.0 Spec**: https://oauth.net/2/
+- **OpenID Connect**: https://openid.net/connect/
+- **PKCE (RFC 7636)**: https://oauth.net/2/pkce/
+- **OWASP OAuth Guide**: https://cheatsheetseries.owasp.org/cheatsheets/OAuth2_Cheatsheet.html
+
+### Tools
+
+- **OIDC Debugger**: https://oidcdebugger.com/
+- **JWT.io**: https://jwt.io/ (decode JWTs)
+- **OAuth 2.0 Playground**: https://www.oauth.com/playground/
+
+### Reference Implementations
+
+- **OBP-Portal** (`~/Documents/workspace_2024/OBP-Portal`)
+  - Production-ready OAuth2/OIDC implementation
+  - Multi-provider support
+  - SvelteKit-based (patterns are framework-agnostic)
+
+- **OBP-OIDC** (`~/Documents/workspace_2024/OBP-OIDC`)
+  - Minimal OIDC provider
+  - Perfect for development/testing
+  - Scala/http4s implementation
+
+---
+
+## 📞 Support
+
+### For Technical Questions
+
+- **Development Team**: dev@tesobe.com
+- **Internal Slack**: #obp-development
+- **Documentation**: This directory
+
+### For Security Issues
+
+- **Security Team**: security@tesobe.com
+- **Follow**: Responsible disclosure guidelines
+
+### For Production Issues
+
+- **On-call Team**: oncall@tesobe.com
+- **Status Page**: status.openbankproject.com
+
+---
+
+## 📝 Document History
+
+| Version | Date | Changes |
+|---------|------|---------|
+| 1.0 | 2024 | Initial documentation created |
+
+---
+
+## ✅ Next Actions
+
+### For New Developers
+
+1. ✅ Read this overview (you're here!)
+2. ⬜ Read [OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md)
+3. ⬜ Set up local environment
+4. ⬜ Test OAuth2 login flow
+5. ⬜ Review [OAUTH2-OIDC-INTEGRATION-PREP.md](OAUTH2-OIDC-INTEGRATION-PREP.md) for details
+
+### For Implementation Team
+
+1. ✅ Review all documentation
+2. ⬜ Set up OBP-OIDC server
+3. ⬜ Create implementation branch
+4. ⬜ Follow Phase 1 (Preparation) in main document
+5. ⬜ Begin Phase 2 (Backend Implementation)
+
+### For Project Stakeholders
+
+1. ✅ Review Executive Summary (Section 1 of main doc)
+2. ⬜ Review timeline (6 weeks)
+3. ⬜ Approve implementation phases
+4. ⬜ Schedule kickoff meeting
+5. ⬜ Assign resources
+
+---
+
+## 🎯 Success Criteria
+
+Implementation is complete when:
+
+- ✅ OAuth2 login flow works end-to-end
+- ✅ Token refresh works automatically
+- ✅ All tests passing (unit, integration, E2E)
+- ✅ Documentation updated
+- ✅ Backward compatibility maintained (OAuth 1.0a still works)
+- ✅ Production deployment successful
+- ✅ Monitoring and alerts configured
+- ✅ Team trained on new system
+
+---
+
+**Ready to begin? Start with [OAUTH2-QUICK-START.md](OAUTH2-QUICK-START.md)!**
+
+---
+
+**License:** AGPL V3  
+**Copyright:** 2024 TESOBE GmbH  
+**Project:** Open Bank Project - API Explorer II