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API Contract: HTTP Authentication

Feature: 006-docker-wasm-examples
Component: kalamdb-api
Purpose: Define X-API-KEY header authentication for SQL API

Authentication Endpoint

SQL Query Execution

Endpoint: POST /sql

Headers:

Content-Type: application/json
X-API-KEY: <user_api_key>

Request Body:

{
  "query": "SELECT * FROM todos WHERE completed = false"
}

Success Response (200 OK):

{
  "columns": ["id", "title", "completed", "created_at"],
  "rows": [
    [1, "Buy groceries", false, "2025-10-25T10:00:00Z"],
    [2, "Write documentation", false, "2025-10-25T11:30:00Z"]
  ],
  "row_count": 2
}

Error Response (401 Unauthorized):

{
  "error": "Unauthorized",
  "message": "Invalid or missing API key"
}

Error Response (400 Bad Request):

{
  "error": "BadRequest",
  "message": "Invalid SQL syntax"
}

Authentication Flow

  1. Client sends SQL query with X-API-KEY header
  2. Middleware extracts header value
  3. Middleware queries user table: SELECT * FROM users WHERE apikey = ?
  4. If not found → 401 Unauthorized
  5. If found → Inject User context into request
  6. Route handler executes query in user's namespace
  7. Return results

Localhost Exception

Special Case: Requests from 127.0.0.1 (localhost)

  • If connection originates from localhost (127.0.0.1 or ::1)
  • AND X-API-KEY header is missing
  • THEN skip authentication (for kalam-cli local development)

Security Note: This exception is only for development. Production deployments should disable localhost bypass or use network isolation.

API Key Format

Valid Formats:

  • UUID v4: 550e8400-e29b-41d4-a716-446655440000
  • Hex string (32 chars): a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6

Invalid Examples:

  • Too short: abc123
  • Invalid characters: my-api-key!
  • Empty string: ""

Rate Limiting

Not Implemented in this feature (future enhancement)

Suggested limits for future:

  • 1000 requests/minute per API key
  • 10,000 requests/hour per API key

Example Usage

cURL

# With API key
curl -X POST http://localhost:8080/sql \
  -H "Content-Type: application/json" \
  -H "X-API-KEY: 550e8400-e29b-41d4-a716-446655440000" \
  -d '{"query": "SELECT * FROM todos"}'

# Localhost (no API key needed)
curl -X POST http://127.0.0.1:8080/sql \
  -H "Content-Type: application/json" \
  -d '{"query": "SELECT * FROM todos"}'

JavaScript/TypeScript

const response = await fetch('http://localhost:8080/sql', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-KEY': 'your-api-key-here'
  },
  body: JSON.stringify({
    query: 'SELECT * FROM todos WHERE completed = false'
  })
});

const data = await response.json();

Security Considerations

  1. Transport Security: Use HTTPS in production (API key transmitted in header)
  2. Key Storage: Never commit API keys to version control
  3. Key Rotation: Manual rotation for now (future: automated rotation)
  4. Localhost Bypass: Disable in production or use Docker network isolation
  5. Logging: Do NOT log API key values (log X-API-KEY: *** instead)