hayate-auth 0.6.0

Authentication for hayate as a pure fetch(Request) -> Response handler: email+password, sessions, CSRF

hayate-auth

Standards-first authentication for hayate — a mountable, better-auth-style auth handler built on the WHATWG Request/Response model.

Status: alpha (0.6.x). Email+password, sessions, CSRF, email verification, password reset, OAuth 2.1 + PKCE (Google / GitHub), TOTP two-factor, API keys, and an OAuth 2.1 authorization server (AS mode: RFC 8414 metadata, RFC 7591 dynamic registration, PKCE-only code + refresh grants) are implemented and attack-regression-tested; a generate CLI and a Cloudflare D1 adapter ship too. Not yet security-audited — see SECURITY.md. The internal design memo (Japanese) lives in DESIGN.md.

import os

from hayate import Hayate
from hayate_auth import Auth
from hayate_auth.adapters.sqlite import SQLiteAdapter

adapter = SQLiteAdapter("app.db")
adapter.create_tables()

auth = Auth(secret=os.environ["AUTH_SECRET"], adapter=adapter)

app = Hayate()
auth.register(app)  # serves /api/auth/* (sign-up, sign-in, session, ...)

@app.get("/me", auth.require_session())
async def me(c):
    return c.json(c.get("user"))

The same file runs under any ASGI server and on Cloudflare Python Workers — see examples/todo.

Endpoints

Method / path (under /api/auth)	Purpose
POST /sign-up/email	Register with email + password, start a session
POST /sign-in/email	Verify credentials, start a session
GET /get-session	Current {user, session} (or nulls)
POST /sign-out	Revoke the session server-side
POST /forget-password → /reset-password	Reset flow via a one-shot hashed token
GET /verify-email	Confirm an email with a one-shot token
POST /sign-in/social → GET /callback/:provider	OAuth 2.1 + PKCE (Google / GitHub)
POST /two-factor/enable · /verify · /disable	TOTP (RFC 6238) enrollment
POST /sign-in/two-factor	Second step when 2FA is on
POST /api-key/create · /verify · /delete · GET /api-key/list	API keys (hashed, scoped, expiring)
GET /oauth2/authorize · POST /oauth2/consent · /oauth2/token · /oauth2/register	AS mode: OAuth 2.1 authorization server

AS mode: be the OAuth authorization server

Pass an AuthorizationServer config and your app issues OAuth 2.1 tokens — authorization-code + PKCE (S256 only), refresh rotation with reuse detection, RFC 8414 metadata at /.well-known/oauth-authorization-server, and open RFC 7591 dynamic client registration (what MCP clients expect). Tokens are opaque and stored hashed; login and consent pages stay yours (login_url / consent_url), the consent decision is one JSON POST.

from hayate_auth import Auth, AuthorizationServer

auth = Auth(
    secret=os.environ["AUTH_SECRET"],
    adapter=adapter,
    authorization_server=AuthorizationServer(
        issuer="https://app.example.com",
        login_url="/login",
        consent_url="/consent",
        scopes_supported=("mcp",),
    ),
)

Paired with hayate-mcp's resource server, that is an MCP server and its authorization server in one app — the flow MCP Inspector and Claude Code drive end to end (examples/mcp-oauth):

from hayate_mcp import Authorization, McpMount
McpMount(server, authorization=Authorization(
    resource="https://app.example.com/mcp",
    authorization_servers=["https://app.example.com"],
    verify_token=auth.oauth_token_verifier(resource="https://app.example.com/mcp"),
)).register(app)

API keys are the lighter-weight bridge to the same resource server — verify_token=auth.verify_api_key protects an MCP server with a static key instead of the full OAuth dance.

With TOTP enabled, /sign-in/email returns {"two_factor_required": true} plus a short-lived signed challenge cookie instead of a session; the client then posts the authenticator code to /sign-in/two-factor to get the session — so a stolen password alone never signs in.

Email delivery is your callback (send_reset_password / send_verification_email); the core mints and verifies tokens but never builds URLs or sends mail. Generate migration DDL with python -m hayate_auth generate --dialect sqlite|postgres|d1.

OAuth providers are injected; the token exchange runs over hayate-fetch, so it works on ASGI and Workers alike:

from hayate_auth import Auth, google, github

auth = Auth(
    secret=os.environ["AUTH_SECRET"],
    adapter=adapter,
    providers=[
        google(client_id=..., client_secret=...),
        github(client_id=..., client_secret=...),
    ],
)

Why

• Python has no equivalent of better-auth: a framework-agnostic, self-hosted, schema-owning auth library. django-allauth is Django-only; fastapi-users is in maintenance mode.
• better-auth works on every JS framework because its core is a single fetch(Request) -> Response handler. hayate is the only Python framework whose user-facing surface is WHATWG Request/Response — so that architecture finally maps 1:1 to Python.
• Zero-dependency core (its only dependency is hayate, itself zero-dependency). Databases, KDFs, and email are injected protocols.

Security posture

• Passwords: scrypt at OWASP parameters (N=2^17, r=8, p=1) on every runtime, PBKDF2-HMAC-SHA256 (600k) fallback; PHC-style strings make the backends mutually verifiable. Length-only policy per NIST SP 800-63B.
• Sessions: opaque 256-bit tokens, only their SHA-256 stored; __Host--prefixed HttpOnly SameSite=Lax cookies on HTTPS.
• CSRF: SameSite + Origin (RFC 6454) + Fetch Metadata — no token embedding.
• Sign-in failures are uniform in body and KDF timing (enumeration defense).
• Coverage ledger: docs/asvs.md (OWASP ASVS V6/V7, ratcheted).
• You must rate-limit /api/auth/* (hayate middleware or your infrastructure): brute-force throttling is deliberately out of core.

License

MIT