title: Python SDK description: OathMesh token verification SDK for Python with FastAPI, Flask, and Django integration patterns. keywords: [oathmesh, python, fastapi, flask, django, jwt, machine-identity] audience: application-developers, platform-engineers, enterprise-teams

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oathmesh

OathMesh token verification SDK for Python.

Table of Contents

• Installation
• Quick Start
• Framework Integrations
• Configuration
• Error Handling
• Troubleshooting
• Security Notes
• Production Tips
• Related Docs

Installation

pip install oathmesh
# or
poetry add oathmesh

Requirements:

• Python 3.9+
• PyJWT >= 2.8.0
• cryptography >= 41.0.0

Quick Start

from oathmesh import verify_token, VerifierConfig

config = VerifierConfig(
    audience="https://inventory.internal",
    trusted_issuers=["https://issuer.oathmesh.tech"],
)

caller = verify_token("OathMesh <token>", config)
print(caller.principal.subject)

Canonical header:

Authorization: OathMesh <token>

Framework Integrations

FastAPI

Use a dependency that calls verify_token(...) and raises HTTPException(401) on OathMeshError.

Flask

Use @app.before_request to verify request.headers.get("Authorization", "").

Django

Use a view decorator that verifies request.META.get("HTTP_AUTHORIZATION", "").

Configuration

from oathmesh import VerifierConfig, verify_raw_token, extract_token

config = VerifierConfig(
    audience="https://inventory.internal",
    trusted_issuers=["https://issuer.oathmesh.tech"],
    on_verified=lambda ctx: logger.info("allowed", extra={"sub": ctx.principal.subject}),
    on_denied=lambda err: logger.warning("denied", extra={"code": err.code, "step": err.step}),
)

token = extract_token(auth_header)
caller = verify_raw_token(token, config)

Verifier semantics:

• Canonical and required header for verification is Authorization: OathMesh <token>.
• extract_token returns None for non-OathMesh schemes.
• If upstream sends Bearer, translate it to OathMesh before calling verifier APIs.
• Verifier behavior is aligned with canonical Go step semantics for conformance-critical checks (including alg=none rejection, subject format validation, binding-required semantics, and future-iat rejection).
• Parity is behavioral across language runtimes; implementations are intentionally language-native, not byte-identical.
• revocation_list remains optional. Cross-SDK conformance currently marks Python revocation behavior as SKIP/N/A.

Error Handling

from oathmesh import OathMeshError

try:
    # verify...
    pass
except OathMeshError as err:
    print(err.code, err.message, err.fix, err.step)

Common codes: claim_missing:token, issuer_untrusted, audience_mismatch, signature_invalid, token_expired.

Troubleshooting

Security Notes

• Verify only tokens from trusted issuers you control.
• Never log raw tokens or API keys.
• Keep issuer TLS and JWKS endpoints reachable and authenticated.
• Treat all claims as untrusted until verification succeeds.

Production Tips

• Reuse verifier config objects across requests.
• Log error code and step for operational triage.
• Use short TTLs and rotate issuer keys safely.
• Monitor deny rates by error code.

Related Docs

• Getting Started
• Troubleshooting Guide
• Community
• Enterprise Guide