lexigram-auth

Authentication and authorization for the Lexigram Framework — JWT, OAuth2, SAML, RBAC, and multi-tenancy.

Overview

Complete authentication and authorization stack for Lexigram — JWT, OAuth2, RBAC, SAML, passkeys, and MFA. Provides a production-ready auth layer with multiple authentication strategies, policy-based access control, session management, and seamless integration with lexigram-web middleware.

Use AuthModule.configure() to register the auth bundle and protect routes with @require_auth, @require_roles, and @require_permissions decorators.

Full documentation: docs.lexigram.dev

Install

uv add lexigram-auth
# Optional extras
uv add "lexigram-auth[oauth2,saml]"

Quick Start

from lexigram import Application
from lexigram.di.module import Module, module
from lexigram.auth import AuthModule, AuthConfig, JWTConfig


@module(
    imports=[
        AuthModule.configure(
            config=AuthConfig(
                secret_key="your-secret-key",
                token=JWTConfig(secret_key="your-jwt-secret"),
            )
        )
    ]
)
class AppModule(Module):
    pass


async def main() -> None:
    async with Application.boot(modules=[AppModule]) as app:
        # app is running — resolve services from app.container
        ...


if __name__ == "__main__":
    import asyncio

    asyncio.run(main())

Configuration

Note: AuthConfig requires both secret_key and token.secret_key — pass an explicit config via AuthModule.configure().

Option 1 — YAML file

# application.yaml
auth:
  secret_key: "your-secret-key"
  token:
    secret_key: "your-jwt-secret"
    algorithm: "HS256"
    access_token_expire: "30m"
  rbac:
    enabled: true
    default_role: "viewer"

Option 2 — Profiles + Environment Variables (recommended)

export LEX_AUTH__SECRET_KEY=your-secret-key
export LEX_AUTH__TOKEN__SECRET_KEY=your-jwt-secret
export LEX_AUTH__TOKEN__ALGORITHM=HS256
export LEX_AUTH__RBAC__DEFAULT_ROLE=viewer

Option 3 — Python

from lexigram.auth import AuthModule, AuthConfig, JWTConfig
from lexigram.contracts.core import Duration

config = AuthConfig(
    secret_key="your-secret-key",
    token=JWTConfig(
        secret_key="your-jwt-secret",
        algorithm="HS256",
        access_token_expire=Duration.minutes(30),
    ),
)
AuthModule.configure(config)

Config reference

Module Factory Methods

Key Features

• JWT authentication — HS256/RS256, key rotation, token blacklisting
• OAuth2 / OIDC — authlib-backed: Google, GitHub, custom providers
• SAML 2.0 — Enterprise SSO via pysaml2
• Passkeys (WebAuthn) — FIDO2 device-based authentication
• MFA (TOTP) — Time-based one-time passwords
• RBAC — Role/permission inheritance with policy expressions
• Session management — Device-aware sessions with concurrency limits
• Token binding — IP address binding to prevent token theft

Testing

async with Application.boot(modules=[AuthModule.stub()]) as app:
    # your test code
    ...

Key Source Files

JWT verification policy

lexigram-auth enforces verified-only JWT decoding — signature verification cannot be disabled.

Stable development secret

For multi-service development, set a stable secret via environment variable:

export LEX_AUTH__TOKEN__SECRET_KEY="a-stable-dev-secret-at-least-32-chars"

Via Python config:

from lexigram.auth.config import AuthConfig, JWTConfig

config = AuthConfig(
    secret_key="a-stable-dev-secret-at-least-32-chars",
    token=JWTConfig(
        secret_key="a-stable-dev-secret-at-least-32-chars",
    ),
)

This prevents the Piccolina-style mistake of silently trusting unverified tokens in production when a secret env-var is missing.