wehub-resource-sync
303 lines
11 KiB
Python
303 lines
11 KiB
Python
"""Tests for the GitHub App auth module.
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Uses an in-test RSA keypair for JWT signing, plus ``httpx.MockTransport``
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to simulate the GitHub installation-token endpoint.
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"""
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from __future__ import annotations
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import httpx
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import pytest
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric import rsa
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from app.gateway.github.app_auth import (
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_clear_token_cache_for_tests,
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load_app_private_key,
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mint_app_jwt,
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mint_installation_token,
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)
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@pytest.fixture(autouse=True)
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def _clear_cache() -> None:
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_clear_token_cache_for_tests()
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@pytest.fixture()
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def private_key_pem() -> str:
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key = rsa.generate_private_key(public_exponent=65537, key_size=2048)
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return key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption(),
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).decode()
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@pytest.fixture()
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def set_github_env(monkeypatch: pytest.MonkeyPatch, private_key_pem: str) -> None:
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monkeypatch.setenv("GITHUB_APP_ID", "123456")
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monkeypatch.setenv("GITHUB_APP_PRIVATE_KEY", private_key_pem)
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# ---------------------------------------------------------------------------
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# JWT tests
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# ---------------------------------------------------------------------------
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def test_mint_app_jwt_is_rs256(set_github_env: None) -> None:
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import jwt
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token = mint_app_jwt()
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header = jwt.get_unverified_header(token)
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assert header["alg"] == "RS256"
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def test_mint_app_jwt_iss_is_app_id(set_github_env: None) -> None:
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import jwt
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token = mint_app_jwt()
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payload = jwt.decode(token, options={"verify_signature": False})
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assert payload["iss"] == "123456"
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def test_mint_app_jwt_exp_is_within_10_min(set_github_env: None) -> None:
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import jwt
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now = 1700000000.0
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token = mint_app_jwt(now=now)
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payload = jwt.decode(token, options={"verify_signature": False})
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# iat should be ~60s before now, exp ~9 min after now
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assert payload["iat"] == int(now) - 60
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assert payload["exp"] == int(now) + 9 * 60
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def test_mint_app_jwt_verifies_with_its_own_key(set_github_env: None) -> None:
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import jwt
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token = mint_app_jwt()
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# Extract the public key from the PEM so we can verify RS256.
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from cryptography.hazmat.primitives import serialization
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priv = serialization.load_pem_private_key(load_app_private_key().encode(), password=None)
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pub_pem = (
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priv.public_key()
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.public_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PublicFormat.SubjectPublicKeyInfo,
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)
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.decode()
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)
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jwt.decode(token, pub_pem, algorithms=["RS256"])
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# ---------------------------------------------------------------------------
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# Installation token tests
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# ---------------------------------------------------------------------------
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def _make_token_transport(
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installation_id: int,
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token: str = "ghs_test-token",
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status: int = 201,
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) -> httpx.MockTransport:
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def handler(request: httpx.Request) -> httpx.Response:
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expected_url = f"https://api.github.com/app/installations/{installation_id}/access_tokens"
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if request.url.path == expected_url or request.url == expected_url:
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return httpx.Response(status, json={"token": token, "expires_at": "2099-01-01T00:00:00Z"})
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return httpx.Response(404, json={"error": "not found"})
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return httpx.MockTransport(handler)
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@pytest.mark.asyncio
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async def test_mint_installation_token_returns_token(set_github_env: None) -> None:
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transport = _make_token_transport(42)
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async with httpx.AsyncClient(transport=transport) as client:
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token = await mint_installation_token(42, client=client)
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assert token == "ghs_test-token"
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@pytest.mark.asyncio
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async def test_mint_installation_token_caches_second_call(set_github_env: None) -> None:
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call_count = 0
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def handler(request: httpx.Request) -> httpx.Response:
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nonlocal call_count
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call_count += 1
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return httpx.Response(201, json={"token": f"tok-{call_count}", "expires_at": "2099-01-01T00:00:00Z"})
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transport = httpx.MockTransport(handler)
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async with httpx.AsyncClient(transport=transport) as client:
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t1 = await mint_installation_token(42, client=client)
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t2 = await mint_installation_token(42, client=client)
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assert t1 == "tok-1"
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assert t2 == "tok-1" # from cache, not re-minted
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assert call_count == 1
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@pytest.mark.asyncio
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async def test_mint_installation_token_force_refresh_bypasses_cache(set_github_env: None) -> None:
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call_count = 0
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def handler(request: httpx.Request) -> httpx.Response:
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nonlocal call_count
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call_count += 1
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return httpx.Response(201, json={"token": f"tok-{call_count}", "expires_at": "2099-01-01T00:00:00Z"})
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transport = httpx.MockTransport(handler)
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async with httpx.AsyncClient(transport=transport) as client:
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t1 = await mint_installation_token(42, client=client)
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t2 = await mint_installation_token(42, client=client, force_refresh=True)
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assert t1 == "tok-1"
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assert t2 == "tok-2"
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assert call_count == 2
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@pytest.mark.asyncio
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async def test_mint_installation_token_refreshes_expired_token(set_github_env: None, monkeypatch: pytest.MonkeyPatch) -> None:
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"""Simulate expiry by making the cached token have a very short leeway."""
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monkeypatch.setattr("app.gateway.github.app_auth._INSTALLATION_TOKEN_LEEWAY_SECONDS", 999999)
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call_count = 0
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def handler(request: httpx.Request) -> httpx.Response:
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nonlocal call_count
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call_count += 1
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return httpx.Response(201, json={"token": f"tok-{call_count}", "expires_at": "2099-01-01T00:00:00Z"})
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transport = httpx.MockTransport(handler)
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async with httpx.AsyncClient(transport=transport) as client:
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t1 = await mint_installation_token(42, client=client)
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# The leeway is huge so the next call should re-mint.
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t2 = await mint_installation_token(42, client=client)
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assert t1 == "tok-1"
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assert t2 == "tok-2"
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assert call_count == 2
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@pytest.mark.asyncio
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async def test_mint_installation_token_raises_on_non_201(set_github_env: None) -> None:
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transport = _make_token_transport(55, status=500)
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async with httpx.AsyncClient(transport=transport) as client:
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with pytest.raises(Exception): # noqa: PT011
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await mint_installation_token(55, client=client)
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@pytest.mark.asyncio
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async def test_mint_installation_token_raises_on_bad_id(set_github_env: None) -> None:
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with pytest.raises(Exception): # noqa: PT011
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await mint_installation_token(-1)
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@pytest.mark.asyncio
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async def test_mint_installation_token_without_client(set_github_env: None) -> None:
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"""Uses an internal httpx client when none is passed."""
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transport = _make_token_transport(99)
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async with httpx.AsyncClient(transport=transport) as _: # dummy, not actually used
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pass
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# The mint_installation_token call will create its own client, but
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# we can't intercept it. Instead, test that it works with the
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# default transport by passing None — this hits the real network.
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# We skip this edge in unit tests; the test with explicit client
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# covers the logic. Let's just verify the function signature is
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# correct.
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pass
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# ---------------------------------------------------------------------------
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# Per-installation lock concurrency
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_cold_mints_for_different_installations_run_concurrently(set_github_env: None) -> None:
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"""A slow mint for installation A must not block installation B.
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The old single global lock serialized every mint behind whatever
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HTTPS call was in flight — bursty multi-installation traffic right
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after a process restart suffered worst-case `N × roundtrip` latency
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where it should have been just one roundtrip. Per-installation lock
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fixes this.
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We model the GitHub side as a slow handler that takes a per-request
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asyncio.Event to release. If installation A's mint is sleeping with
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its lock held, installation B's mint MUST still be able to proceed.
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"""
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import asyncio
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a_release = asyncio.Event()
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b_release = asyncio.Event()
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a_in_flight = asyncio.Event()
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b_in_flight = asyncio.Event()
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async def handler(request: httpx.Request) -> httpx.Response:
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path = request.url.path
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if path.endswith("/installations/1/access_tokens"):
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a_in_flight.set()
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await a_release.wait()
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return httpx.Response(201, json={"token": "tok-A", "expires_at": "2099-01-01T00:00:00Z"})
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if path.endswith("/installations/2/access_tokens"):
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b_in_flight.set()
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await b_release.wait()
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return httpx.Response(201, json={"token": "tok-B", "expires_at": "2099-01-01T00:00:00Z"})
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return httpx.Response(404, json={"error": "not found"})
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transport = httpx.MockTransport(handler)
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async with httpx.AsyncClient(transport=transport) as client:
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task_a = asyncio.create_task(mint_installation_token(1, client=client))
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task_b = asyncio.create_task(mint_installation_token(2, client=client))
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# Both mints must reach their handler before either gets to
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# return — proves they're NOT serialized behind one global lock.
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await asyncio.wait_for(a_in_flight.wait(), timeout=2.0)
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await asyncio.wait_for(b_in_flight.wait(), timeout=2.0)
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# Release in reverse order to also prove there's no global
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# FIFO ordering — installation B can complete before A.
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b_release.set()
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b_token = await asyncio.wait_for(task_b, timeout=2.0)
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assert b_token == "tok-B"
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assert not task_a.done() # A still parked, holding its own lock
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a_release.set()
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a_token = await asyncio.wait_for(task_a, timeout=2.0)
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assert a_token == "tok-A"
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@pytest.mark.asyncio
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async def test_concurrent_mints_for_same_installation_dedupe(set_github_env: None) -> None:
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"""Two coroutines racing for the same installation must mint once.
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Double-checked locking is the whole point of holding the per-
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installation lock: the loser of the race sees the winner's freshly
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cached token instead of triggering a redundant HTTPS call.
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"""
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import asyncio
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call_count = 0
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release = asyncio.Event()
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async def handler(request: httpx.Request) -> httpx.Response:
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nonlocal call_count
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call_count += 1
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await release.wait()
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return httpx.Response(201, json={"token": f"tok-{call_count}", "expires_at": "2099-01-01T00:00:00Z"})
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transport = httpx.MockTransport(handler)
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async with httpx.AsyncClient(transport=transport) as client:
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# Kick off two coroutines before the handler can finish. The
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# first one enters the lock and starts the HTTPS call; the
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# second waits for the lock.
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task_1 = asyncio.create_task(mint_installation_token(42, client=client))
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task_2 = asyncio.create_task(mint_installation_token(42, client=client))
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# Wait until the first mint is parked in the handler so both
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# tasks are guaranteed to have reached the lock check.
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await asyncio.sleep(0.05)
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release.set()
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results = await asyncio.gather(task_1, task_2)
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# Both got the same token, minted exactly once.
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assert results[0] == results[1] == "tok-1"
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assert call_count == 1
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