Auth (lexigram-auth)

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

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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.

Install

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

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

app = Application(modules=[AppModule])
if __name__ == "__main__":
    app.run()

Configuration

Zero-config usage: Call AuthModule.configure() with no arguments to use defaults.

Option 1 — YAML file

application.yaml

auth:
  jwt:
    secret_key: "${JWT_SECRET_KEY}"
    algorithm: "HS256"
    expiration_hours: 24
  rbac:
    enabled: true
    default_role: "viewer"
  session:
    timeout_minutes: 60

Option 2 — Profiles + Environment Variables (recommended)

export LEX_AUTH__JWT__SECRET_KEY=your-secret
export LEX_AUTH__JWT__ALGORITHM=HS256
export LEX_AUTH__RBAC__DEFAULT_ROLE=viewer

Option 3 — Python

from lexigram.auth import AuthModule, AuthConfig, JWTConfig

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

Config reference

Field	Default	Env var	Description
jwt.secret_key	—	LEX_AUTH__JWT__SECRET_KEY	JWT signing secret (required)
jwt.algorithm	HS256	LEX_AUTH__JWT__ALGORITHM	JWT algorithm: HS256, RS256, ES256
jwt.access_token_expire_minutes	30	LEX_AUTH__JWT__ACCESS_TOKEN_EXPIRE_MINUTES	Access token lifetime
rbac.enabled	True	LEX_AUTH__RBAC__ENABLED	Enable RBAC
rbac.default_role	viewer	LEX_AUTH__RBAC__DEFAULT_ROLE	Default role for new users
session.timeout_minutes	60	LEX_AUTH__SESSION__TIMEOUT_MINUTES	Session inactivity timeout

Module Factory Methods

Method	Description
AuthModule.configure(...)	Configure with explicit AuthConfig
AuthModule.stub()	Minimal config for testing

Key Features

• JWT authentication — HS256/RS256, key rotation, token blacklisting
• OAuth2 / OIDC — authlib-backed: Google, GitHub, custom providers
• SAML 2.0 — Enterprise SSO via python3-saml
• 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 — MTLS / IP binding to prevent token theft

Testing

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

Key Source Files

File	What it contains
src/lexigram/auth/module.py	AuthModule definition
src/lexigram/auth/config.py	AuthConfig, JWTConfig, RBACConfig
src/lexigram/auth/di/bundle_provider.py	AuthBundleProvider wiring
src/lexigram/auth/authn/jwt.py	JWTTokenManager implementation
src/lexigram/auth/authz/service.py	AuthorizationService