go-oauth2-server

README

OAuth2 Server Documentation

A comprehensive OAuth2 authorization server implementation supporting multiple grant types and complete user, client, and token management.

Features

OAuth2 Grant Types Support

• Authorization Code Grant
• Client Credentials Grant
• Password Grant (Resource Owner Password Credentials)
• Refresh Token Grant

Client Management

• Client registration and authentication
• Multiple redirect URIs support
• Grant type restrictions
• Scope-based access control
• Confidential and public client support

User Management

• User registration and authentication
• Role-based access control
• Password reset functionality
• Email verification
• Profile management

Token Management

• Access token generation and validation
• Refresh token handling
• Token introspection
• Token revocation (single and bulk)
• Active session management

Security Features

• Rate limiting
• Audit logging
• Session management
• Basic authentication support
• Scope-based authorization
• Token introspection

Consent Management

• User consent tracking
• Granular permission control
• Consent revocation
• Consent history

API Documentation

OAuth2 Endpoints

Token Endpoint

POST /api/v1/oauth/tokens
Authorization: Basic {client_credentials}
Content-Type: application/x-www-form-urlencoded

Supported grant types:

1. Authorization Code

grant_type=authorization_code
code={authorization_code}
redirect_uri={redirect_uri}

1. Client Credentials

grant_type=client_credentials
scope={scope}

1. Password

grant_type=password
username={username}
password={password}
scope={scope}

1. Refresh Token

grant_type=refresh_token
refresh_token={refresh_token}

Token Introspection

POST /api/v1/oauth/introspect
Authorization: Basic {client_credentials}
Content-Type: application/x-www-form-urlencoded

token={token}
token_type_hint={access_token|refresh_token}

Client Management API

Register New Client

POST /api/v1/oauth/clients
Content-Type: application/json

{
    "name": "My Application",
    "redirect_uris": ["https://app.example.com/callback"],
    "grant_types": ["authorization_code", "refresh_token"],
    "scope": "read write",
    "confidential": true
}

List Clients

GET /api/v1/oauth/clients

Update Client

PUT /api/v1/oauth/clients/{client_id}

Delete Client

DELETE /api/v1/oauth/clients/{client_id}

User Management API

Register User

POST /api/v1/users
Content-Type: application/json

{
    "username": "john.doe@example.com",
    "password": "secure_password",
    "name": "John Doe",
    "roles": ["user"]
}

User Operations

PUT /api/v1/users/profile          # Update user profile
POST /api/v1/users/reset-password  # Reset password
POST /api/v1/users/verify-email    # Verify email
GET /api/v1/users                  # List users (admin only)
PUT /api/v1/users/{user_id}        # Update user (admin only)
DELETE /api/v1/users/{user_id}     # Delete user (admin only)

Scope Management API

Create Scope

POST /api/v1/oauth/scopes
Content-Type: application/json

{
    "name": "read_profile",
    "description": "Read user profile information"
}

Scope Operations

GET /api/v1/oauth/scopes           # List scopes
PUT /api/v1/oauth/scopes/{scope_id}      # Update scope
DELETE /api/v1/oauth/scopes/{scope_id}    # Delete scope

Consent Management API

Create Consent

POST /api/v1/oauth/consents
Content-Type: application/json

{
    "client_id": "client_id",
    "scopes": ["read", "write"]
}

Consent Operations

GET /api/v1/oauth/consents                # List consents
DELETE /api/v1/oauth/consents/{consent_id} # Revoke consent

Security & Monitoring API

Token Management

GET /api/v1/oauth/tokens          # List active tokens
POST /api/v1/oauth/tokens/revoke  # Revoke specific token
POST /api/v1/oauth/tokens/bulk-revoke # Bulk revoke tokens

Monitoring

GET /api/v1/audit-logs           # View audit logs
GET /api/v1/oauth/rate-limits    # Check rate limit status
GET /api/v1/oauth/sessions       # List active sessions
DELETE /api/v1/oauth/sessions/{session_id} # End session

Authentication

Most endpoints require authentication using HTTP Basic Authentication with client credentials:

Authorization: Basic base64(client_id:client_secret)

Error Handling

The API uses standard HTTP status codes and returns errors in the following format:

{
    "error": "error_code",
    "error_description": "Detailed error message",
    "error_uri": "https://documentation/errors/error_code"
}

Rate Limiting

The API implements rate limiting per client. Current limits can be checked via the rate-limiting endpoint.

Security Considerations

1. Always use HTTPS in production
2. Implement proper password hashing
3. Store client secrets securely
4. Implement token encryption
5. Set up proper CORS configuration
6. Enable audit logging
7. Implement IP whitelisting where appropriate

Database Schema

The server requires the following database tables:

• users
• clients
• access_tokens
• refresh_tokens
• authorization_codes
• scopes
• client_scopes
• user_consents
• audit_logs