Technical Specification

Technical Specification

Table of Contents

• Overview
• When to Use
• Quick Start
• Reference Guides
• Best Practices

Overview

Create comprehensive technical specifications that define system requirements, architecture, implementation details, and acceptance criteria for software projects.

When to Use

• Feature specifications
• System design documents
• Requirements documentation (PRD)
• Architecture decision records (ADR)
• Technical proposals
• RFC (Request for Comments)
• API design specs
• Database schema designs

Quick Start

Minimal working example:

# Technical Specification: [Feature Name]

**Document Status:** Draft | Review | Approved | Implemented
**Version:** 1.0
**Author:** John Doe
**Date:** 2025-01-15
**Reviewers:** Jane Smith, Bob Johnson
**Last Updated:** 2025-01-15

## Executive Summary

Brief 2-3 sentence overview of what this spec covers and why it's being built.

**Problem:** What problem are we solving?
**Solution:** High-level description of the solution
**Impact:** Expected business/user impact

---

## 1. Background

### Context

Provide background on why this feature is needed:

// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Best Practices

✅ DO

• Include acceptance criteria for each requirement
• Provide architecture diagrams
• Document API contracts
• Specify performance requirements
• List risks and mitigations
• Include implementation timeline
• Add success metrics
• Document security considerations
• Version your specs
• Get stakeholder review

❌ DON'T

• Be vague about requirements
• Skip non-functional requirements
• Forget about security
• Ignore alternatives
• Skip testing strategy
• Forget monitoring/observability
• Leave questions unanswered

API Data Models

API Data Models

interface User {
  id: string;
  email: string;
  emailVerified: boolean;
  twoFactorEnabled: boolean;
  createdAt: string;
  updatedAt: string;
  lastLoginAt?: string;
}

interface LoginRequest {
  email: string;
  password: string;
  twoFactorCode?: string;
}

interface LoginResponse {
  success: boolean;
  token: string;
  refreshToken: string;
  user: User;
  expiresIn: number;
}

interface RegisterRequest {
  email: string;
  password: string;
  confirmPassword: string;
}

---

Authentication Endpoints

Authentication Endpoints

POST /api/auth/register

Description: Register a new user account

Request:

{
  "email": "user@example.com",
  "password": "SecurePass123!",
  "confirmPassword": "SecurePass123!"
}

Response (201):

{
  "success": true,
  "user": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "email": "user@example.com",
    "emailVerified": false
  },
  "message": "Verification email sent"
}

Errors:

• 400: Invalid email format
• 409: Email already exists
• 422: Password too weak

POST /api/auth/login

Description: Authenticate user and return JWT token

Request:

{
  "email": "user@example.com",
  "password": "SecurePass123!",
  "twoFactorCode": "123456"
}

Response (200):

{
  "success": true,
  "token": "eyJhbGciOiJIUzI1NiIs...",
  "refreshToken": "eyJhbGciOiJIUzI1NiIs...",
  "user": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "email": "user@example.com"
  },
  "expiresIn": 3600
}

Errors:

• 401: Invalid credentials
• 403: Account locked
• 428: 2FA code required

Database Schema

Database Schema

-- Users table
CREATE TABLE users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  email VARCHAR(255) UNIQUE NOT NULL,
  password_hash VARCHAR(255),
  email_verified BOOLEAN DEFAULT FALSE,
  two_factor_enabled BOOLEAN DEFAULT FALSE,
  two_factor_secret VARCHAR(32),
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW(),
  last_login_at TIMESTAMP
);

-- OAuth connections
CREATE TABLE oauth_connections (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id) ON DELETE CASCADE,
  provider VARCHAR(50) NOT NULL, -- 'google', 'github'
  provider_user_id VARCHAR(255) NOT NULL,
  access_token TEXT,
  refresh_token TEXT,
  created_at TIMESTAMP DEFAULT NOW(),
  UNIQUE(provider, provider_user_id)
);

-- Sessions
CREATE TABLE sessions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id) ON DELETE CASCADE,
  token VARCHAR(255) UNIQUE NOT NULL,
  expires_at TIMESTAMP NOT NULL,
  created_at TIMESTAMP DEFAULT NOW(),
  ip_address INET,
  user_agent TEXT
);

-- Indexes
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_sessions_token ON sessions(token);
CREATE INDEX idx_sessions_user_id ON sessions(user_id);
CREATE INDEX idx_oauth_user_id ON oauth_connections(user_id);

Functional Requirements

Functional Requirements

FR-1: User Authentication

Priority: P0 (Must Have) Description: Users must be able to authenticate using email/password

Acceptance Criteria:

• [ ] User can register with email and password
• [ ] User can log in with credentials
• [ ] User receives email verification
• [ ] User can reset forgotten password
• [ ] Session expires after 7 days of inactivity

Dependencies: None

FR-2: Social Login

Priority: P1 (Should Have) Description: Users can authenticate using OAuth providers

Acceptance Criteria:

• [ ] Support Google OAuth
• [ ] Support GitHub OAuth
• [ ] Link social accounts to existing accounts
• [ ] Unlink social accounts

Dependencies: FR-1

FR-3: Two-Factor Authentication

Priority: P2 (Nice to Have) Description: Optional 2FA for enhanced security

Acceptance Criteria:

• [ ] Enable/disable 2FA in settings
• [ ] Support TOTP (Google Authenticator, Authy)
• [ ] Backup codes generation
• [ ] Recovery process if device is lost

Dependencies: FR-1

Non-Functional Requirements

Non-Functional Requirements

Performance

• Response Time: API endpoints < 200ms p95
• Throughput: Support 1000 requests/second
• Database Queries: < 50ms p95
• Page Load: First contentful paint < 1.5s

Scalability

• Concurrent Users: Support 100,000 simultaneous users
• Data Growth: Handle 10M user records
• Horizontal Scaling: Support 10 application instances

Security

• Authentication: JWT-based with refresh tokens
• Password Hashing: bcrypt with 12 rounds
• Rate Limiting: 100 requests/hour per IP
• Data Encryption: AES-256 at rest, TLS 1.3 in transit

Availability

• Uptime: 99.9% SLA
• Recovery Time: RTO < 4 hours, RPO < 1 hour
• Backup: Daily automated backups, 30-day retention

Compliance

• GDPR compliant (data export/deletion)
• SOC 2 Type II requirements
• PCI DSS (if handling payments)

---

Phase 1: Core Authentication

Phase 1: Core Authentication (Week 1-2)

• [ ] Database schema setup
• [ ] User registration endpoint
• [ ] Email/password login
• [ ] JWT token generation
• [ ] Password hashing
• [ ] Basic frontend forms

Phase 2: Email Verification (Week 3)

• [ ] Email service integration
• [ ] Verification token generation
• [ ] Verification endpoint
• [ ] Email templates
• [ ] Resend verification email

Phase 3: Social Login (Week 4)

• [ ] OAuth integration (Google)
• [ ] OAuth integration (GitHub)
• [ ] Account linking
• [ ] Frontend OAuth buttons

Phase 4: Security Features (Week 5)

• [ ] Two-factor authentication
• [ ] Password reset flow
• [ ] Rate limiting
• [ ] Session management
• [ ] Security headers

Phase 5: Testing & Polish (Week 6)

• [ ] Unit tests
• [ ] Integration tests
• [ ] E2E tests
• [ ] Security audit
• [ ] Performance testing
• [ ] Documentation

---

Rate Limiting

Rate Limiting

---

Document Title

Overview

TODO: Brief description of this document's purpose.

Prerequisites

• TODO: List prerequisites

Getting Started

TODO: Step-by-step instructions.

Configuration

TODO: Configuration details.

Examples

TODO: Add practical examples.

Troubleshooting

TODO: Common issues and solutions.

References

• TODO: Add relevant links