tests/conftest.py

# Copyright 2026 Dataiku SAS
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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# See the License for the specific language governing permissions and
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"""Synthetic TLS material shared by local configuration and HTTPS tests."""

from datetime import datetime, timedelta, timezone

import pytest
from cryptography import x509
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import ExtendedKeyUsageOID, NameOID


@pytest.fixture
def localhost_certificate(tmp_path):
    key = rsa.generate_private_key(public_exponent=65537, key_size=2048)
    name = x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, "localhost")])
    now = datetime.now(timezone.utc)
    certificate = (
        x509.CertificateBuilder()
        .subject_name(name)
        .issuer_name(name)
        .public_key(key.public_key())
        .serial_number(x509.random_serial_number())
        .not_valid_before(now - timedelta(days=1))
        .not_valid_after(now + timedelta(days=1))
        .add_extension(
            x509.SubjectAlternativeName([x509.DNSName("localhost")]), critical=False
        )
        .add_extension(x509.BasicConstraints(ca=True, path_length=None), critical=True)
        .add_extension(
            x509.ExtendedKeyUsage([ExtendedKeyUsageOID.SERVER_AUTH]), critical=False
        )
        .sign(key, hashes.SHA256())
    )
    pem = certificate.public_bytes(serialization.Encoding.PEM).decode("ascii")
    cert_path = tmp_path / "localhost.pem"
    key_path = tmp_path / "localhost-key.pem"
    cert_path.write_text(pem)
    key_path.write_bytes(
        key.private_bytes(
            serialization.Encoding.PEM,
            serialization.PrivateFormat.PKCS8,
            serialization.NoEncryption(),
        )
    )
    return pem, cert_path, key_path