# AuthKit Implementation Plan
**Document ID:** PHENOTYPE_AUTHKIT_PLAN
**Status:** Active
**Last Updated:** 2026-04-05
**Version:** 1.0.0
**Author:** Phenotype Architecture Team
---
## Table of Contents
1. [Project Overview & Objectives](#1-project-overview--objectives)
2. [Architecture Strategy](#2-architecture-strategy)
3. [Implementation Phases](#3-implementation-phases)
4. [Technical Stack Decisions](#4-technical-stack-decisions)
5. [Risk Analysis & Mitigation](#5-risk-analysis--mitigation)
6. [Resource Requirements](#6-resource-requirements)
7. [Timeline & Milestones](#7-timeline--milestones)
8. [Dependencies & Blockers](#8-dependencies--blockers)
9. [Testing Strategy](#9-testing-strategy)
10. [Deployment Plan](#10-deployment-plan)
11. [Rollback Procedures](#11-rollback-procedures)
12. [Post-Launch Monitoring](#12-post-launch-monitoring)
---
## 1. Project Overview & Objectives
### 1.1 Executive Summary
AuthKit is the authentication and authorization toolkit for the Phenotype ecosystem, providing a comprehensive, secure, and developer-friendly framework for managing user identities, authentication flows, session management, and access control across all Phenotype services.
### 1.2 Vision Statement
To be the single source of truth for authentication in the Phenotype ecosystem, providing unified authentication across all services and platforms, secure-by-default implementation with industry best practices, developer-friendly APIs with sensible defaults, extensible architecture supporting custom providers, and compliance-ready audit logging and security controls.
### 1.3 Primary Objectives
| **Security First** | PKCE mandatory, HTTPS enforced | Security audit pass |
| **Developer Experience** | < 5 min integration time | Developer surveys |
| **Multi-Provider** | 10+ providers supported | Provider count |
| **Compliance Ready** | SOC 2, GDPR aligned | Audit completion |
| **Zero Trust** | mTLS, short-lived tokens | Security posture |
### 1.4 Scope
| Authentication | OAuth 2.0/OIDC flows, passwordless, MFA | P0 |
| Session Management | Server-side sessions, JWT tokens, cookies | P0 |
| Provider Management | Multi-provider support, account linking | P0 |
| Authorization | Policy engine integration, RBAC/ABAC | P1 |
| Security | Rate limiting, brute force protection, audit | P1 |
| Developer SDK | Python and Go SDKs | P1 |
| Monitoring | Health checks, metrics, alerting | P2 |
---
## 2. Architecture Strategy
### 2.1 System Context
```
┌─────────────────────────────────────────────────────────────────────────────┐
│ Phenotype Ecosystem │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
│ │ Web App │ │ Mobile App │ │ CLI Tool │ │
│ │ (React) │ │ (Flutter) │ │ (Python) │ │
│ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ │
│ │ │ │ │
│ └──────────────────┼──────────────────┘ │
│ │ │
│ ┌─────────────────────────▼───────────────────────────┐ │
│ │ AuthKit │ │
│ │ │ │
│ │ ┌─────────────────────────────────────────────┐ │ │
│ │ │ Authentication Service │ │ │
│ │ │ • OAuth 2.0/OIDC flows │ │ │
│ │ │ • PKCE implementation │ │ │
│ │ │ • Multi-provider support │ │ │
│ │ │ • Account linking │ │ │
│ │ └─────────────────────────────────────────────┘ │ │
│ │ ┌─────────────────────────────────────────────┐ │ │
│ │ │ Session Manager │ │ │
│ │ │ • Server-side sessions (Redis) │ │ │
│ │ │ • JWT access tokens │ │ │
│ │ │ • Cookie management │ │ │
│ │ │ • Session revocation │ │ │
│ │ └─────────────────────────────────────────────┘ │ │
│ │ ┌─────────────────────────────────────────────┐ │ │
│ │ │ Provider Registry │ │ │
│ │ │ • Google, GitHub, Microsoft, Apple │ │ │
│ │ │ • SAML enterprise providers │ │ │
│ │ │ • Custom OAuth2 providers │ │ │
│ │ └─────────────────────────────────────────────┘ │ │
│ │ ┌─────────────────────────────────────────────┐ │ │
│ │ │ Security Layer │ │ │
│ │ │ • Rate limiting │ │ │
│ │ │ • Brute force protection │ │ │
│ │ │ • Audit logging │ │ │
│ │ │ • Token validation │ │ │
│ │ └─────────────────────────────────────────────┘ │ │
│ └─────────────────────────┬───────────────────────────┘ │
│ │ │
│ ┌─────────────────────────▼───────────────────────────┐ │
│ │ Phenotype Services │ │
│ │ │ │
│ │ ┌─────────────┐ ┌─────────────┐ ┌────────────┐ │ │
│ │ │ Service A │ │ Service B │ │ Service C │ │ │
│ │ │ │ │ │ │ │ │ │
│ │ │ Validate │ │ Validate │ │ Validate │ │ │
│ │ │ JWT locally │ │ JWT locally │ │ JWT locally│ │ │
│ │ └─────────────┘ └─────────────┘ └────────────┘ │ │
│ └─────────────────────────────────────────────────────┘ │
│ │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ Infrastructure │ │
│ │ │ │
│ │ ┌─────────────┐ ┌─────────────┐ ┌────────────┐ │ │
│ │ │ Redis │ │ Database │ │ Vault │ │ │
│ │ │ (Sessions) │ │ (Users) │ │ (Secrets) │ │ │
│ │ └─────────────┘ └─────────────┘ └────────────┘ │ │
│ └─────────────────────────────────────────────────────┘ │
│ │
└─────────────────────────────────────────────────────────────────────────────┘
```
### 2.2 Data Flow
```
┌─────────────────────────────────────────────────────────────────────────────┐
│ Authentication Data Flow │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ 1. Client initiates login │
│ └─▶ POST /auth/login {provider: "google"} │
│ │
│ 2. AuthKit generates PKCE pair and authorization URL │
│ └─▶ Response: {authorization_url, state} │
│ │
│ 3. Client redirects user to provider │
│ └─▶ User authenticates with Google │
│ │
│ 4. Provider redirects back with authorization code │
│ └─▶ GET /auth/callback?code=xxx&state=yyy │
│ │
│ 5. AuthKit exchanges code for tokens │
│ └─▶ POST /oauth/token {code, code_verifier} │
│ └─▶ Response: {access_token, refresh_token, id_token} │
│ │
│ 6. AuthKit validates ID token and extracts user info │
│ └─▶ Verify signature, claims, expiration │
│ │
│ 7. AuthKit resolves or creates user identity │
│ └─▶ Check account linking, create if new │
│ │
│ 8. AuthKit creates session │
│ └─▶ Store in Redis, generate session cookie │
│ │
│ 9. AuthKit generates JWT access token │
│ └─▶ Sign with HS256, embed session ID │
│ │
│ 10. Response to client │
│ └─▶ Set-Cookie: authkit_session=... │
│ └─▶ Response: {access_token, user, expires_in} │
│ │
│ 11. Client uses access token for API requests │
│ └─▶ Authorization: Bearer <jwt> │
│ └─▶ Services validate JWT locally │
│ │
└─────────────────────────────────────────────────────────────────────────────┘
```
---
## 3. Implementation Phases
### Phase 1: Core Authentication (Weeks 1-4)
#### 1.1 OAuth 2.0 Foundation
- [ ] PKCE implementation
- [ ] Authorization code flow
- [ ] Token exchange
- [ ] State parameter validation
#### 1.2 Provider Integration
- [ ] Google OAuth2
- [ ] GitHub OAuth2
- [ ] Microsoft OIDC
- [ ] Provider abstraction
#### 1.3 Session Management
- [ ] Redis session store
- [ ] Session cookie handling
- [ ] Session lifecycle
- [ ] Session revocation
**Deliverables:**
- OAuth 2.0 + PKCE implementation
- 3 major providers
- Session management
- Basic SDK
### Phase 2: Security & MFA (Weeks 5-8)
#### 2.1 Security Controls
- [ ] Rate limiting per endpoint
- [ ] Brute force protection
- [ ] Breached password detection
- [ ] Secure cookie attributes
#### 2.2 Token Management
- [ ] JWT signing (RS256, ES256)
- [ ] Token rotation
- [ ] Refresh token handling
- [ ] Token revocation
#### 2.3 MFA Support
- [ ] TOTP implementation
- [ ] WebAuthn/FIDO2
- [ ] SMS/Email OTP
- [ ] MFA enforcement policies
**Deliverables:**
- Security hardening
- Token management
- MFA support
- Audit logging
### Phase 3: Enterprise Features (Weeks 9-12)
#### 3.1 SAML Support
- [ ] SAML 2.0 SP implementation
- [ ] XML signature validation
- [ ] IdP-initiated flow
- [ ] SP-initiated flow
#### 3.2 Account Management
- [ ] Account linking
- [ ] Identity resolution
- [ ] Profile merging
- [ ] Account deletion
#### 3.3 Organization Support
- [ ] Multi-tenant sessions
- [ ] Organization-scoped tokens
- [ ] Member management
- [ ] Role assignments
**Deliverables:**
- SAML integration
- Account linking
- Organization support
- Enterprise SDK
### Phase 4: SDK & Integration (Weeks 13-16)
#### 4.1 Python SDK
- [ ] Async client
- [ ] Flask integration
- [ ] FastAPI integration
- [ ] Django integration
#### 4.2 Go SDK
- [ ] HTTP client
- [ ] Gin middleware
- [ ] Fiber middleware
- [ ] gRPC interceptors
#### 4.3 Rust SDK
- [ ] Async client
- [ ] Axum integration
- [ ] Actix integration
- [ ] Policy engine
**Deliverables:**
- Python SDK
- Go SDK
- Rust SDK
- Framework integrations
### Phase 5: Production Hardening (Weeks 17-20)
#### 5.1 Performance
- [ ] Connection pooling
- [ ] Caching layer
- [ ] Lazy loading
- [ ] Async optimizations
#### 5.2 Reliability
- [ ] Fallback chains
- [ ] Circuit breakers
- [ ] Retry logic
- [ ] Health checks
#### 5.3 Compliance
- [ ] SOC 2 controls
- [ ] GDPR compliance
- [ ] Audit trails
- [ ] Data retention
**Deliverables:**
- Production release
- Performance optimized
- Compliance certified
- Complete documentation
---
## 4. Technical Stack Decisions
| OAuth/OIDC | authlib | go-oidc | oauth2 | Standards compliant |
| JWT | PyJWT | golang-jwt | jsonwebtoken | Widely used |
| WebAuthn | webauthn | go-webauthn | webauthn-rs | FIDO2 support |
| Password Hash | Argon2id | bcrypt | argon2 | Memory-hard |
| Session Store | Redis | Redis | Redis | Performance |
---
## 5. Risk Analysis & Mitigation
| **Security vulnerability** | Low | Critical | Security review, audit, bug bounty |
| **Token compromise** | Low | Critical | Short TTL, rotation, monitoring |
| **Provider downtime** | Medium | High | Fallback providers, local auth |
| **Integration complexity** | Medium | Medium | SDKs, middleware, examples |
| **Compliance gaps** | Low | High | Regular audits, legal review |
---
## 6. Resource Requirements
| Security Lead | 1.0 | Full |
| Backend Developer | 1.0 | Phase 1-5 |
| SDK Developer | 0.75 | Phase 3-5 |
| QA Engineer | 0.5 | Phase 2-5 |
| Security Auditor | 0.25 | Phase 1, 5 |
---
## 7. Timeline & Milestones
| M1: Core Auth | Week 4 | OAuth, providers, sessions |
| M2: Security | Week 8 | MFA, tokens, rate limiting |
| M3: Enterprise | Week 12 | SAML, orgs, linking |
| M4: SDKs | Week 16 | Python, Go, Rust SDKs |
| M5: Production | Week 20 | v1.0.0, compliance |
---
## 8. Dependencies & Blockers
| Redis | Sessions | Available |
| Vault | Secrets | Available |
| authlib | Python OAuth | Available |
| go-oidc | Go OAuth | Available |
---
## 9. Testing Strategy
| Unit Tests | 90%+ | pytest, go test, cargo test |
| Security | 100% | OWASP ZAP, fuzzing |
| Integration | 85%+ | Testcontainers |
| Compliance | 100% | Automated compliance tests |
---
## 10. Deployment Plan
| Dev | PR | Unit tests |
| Staging | Merge | Integration, security |
| Production | Manual | Load tests, penetration |
---
## 11. Rollback Procedures
| Auth bypass detected | Emergency rollback | Immediate |
| Token validation failure | Partial rollback | 15 minutes |
| Provider outage | Failover activation | 5 minutes |
---
## 12. Post-Launch Monitoring
| Login success rate | > 99% | < 95% |
| Token validation | < 10ms p99 | > 50ms |
| Session revocation | < 100ms | > 500ms |
| MFA completion | > 90% | < 80% |
---
*Last Updated: 2026-04-05*
*Plan Version: 1.0.0*