certifi 2026.2.25: core.where, core.contents

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:pypi/certifi@2026.2.25
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:pypi/certifi@2026.2.25
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:287fff97fadcc4acd071a405388de21963c34c3b3184d020d50cfa19219f2310","contract":["certifi.core.where returns an existing file path pointing to the Mozilla CA certificate bundle containing PEM root certificates","certifi.core.contents returns the text content of the CA bundle containing PEM formatted root certificates","certifi.core.where path loads valid CA certificates into standard ssl SSLContext for TLS verification"],"goal":"verify pkg:pypi/certifi@2026.2.25","kind":"HOW","packages":["pkg:pypi/certifi@2026.2.25"],"schemaVersion":1,"symbols":["certifi.core.where","certifi.core.contents"]},"contractCommand":["python","test/contract.py"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"pypi","language":"python","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"pip","runtime":"python","schemaVersion":1},"license":"MIT-0","packages":["pkg:pypi/certifi@2026.2.25"],"schemaVersion":1,"symbols":["certifi.core.where","certifi.core.contents"],"verifierAdapter":"python@1"}

certifi==2026.2.25

"""Sample demonstrating certificate authority bundle path resolution, content retrieval, and SSLContext verification using certifi."""

import os
import ssl
from typing import List, Tuple
import certifi.core


def get_ca_bundle_path() -> str:
    """Return the filesystem path to the installed CA bundle."""
    return certifi.core.where()


def get_ca_bundle_contents() -> str:
    """Return the text content of the CA bundle."""
    return certifi.core.contents()


def create_verified_ssl_context() -> ssl.SSLContext:
    """Create an SSLContext configured with certifi's CA bundle for TLS verification."""
    bundle_path = certifi.core.where()
    ctx = ssl.create_default_context(cafile=bundle_path)
    return ctx


def inspect_ca_bundle() -> Tuple[str, bool, int, int]:
    """Inspect CA bundle path, existence, content length, and number of loaded certificates."""
    bundle_path = certifi.core.where()
    exists = os.path.isfile(bundle_path)
    contents = certifi.core.contents()
    ctx = create_verified_ssl_context()
    ca_certs: List[dict] = ctx.get_ca_certs()
    return bundle_path, exists, len(contents), len(ca_certs)

{
  "schemaVersion": 1,
  "goal": "verify pkg:pypi/certifi@2026.2.25",
  "kind": "HOW",
  "packages": [
    "pkg:pypi/certifi@2026.2.25"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

"""Contract verification test for certifi.core CA bundle resolution, contents, and SSLContext integration."""

import os
import ssl
import sys

# Ensure project root is on sys.path for local module imports
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import certifi.core
from sample import (
    create_verified_ssl_context,
    get_ca_bundle_contents,
    get_ca_bundle_path,
    inspect_ca_bundle,
)


def test_where_returns_valid_pem_file():
    """Assertion 1: certifi.core.where returns an existing file path pointing to the Mozilla CA certificate bundle containing PEM root certificates."""
    bundle_path = get_ca_bundle_path()
    assert isinstance(bundle_path, str)
    assert len(bundle_path) > 0
    assert os.path.exists(bundle_path), f"Bundle path does not exist: {bundle_path}"
    assert os.path.isfile(bundle_path), f"Bundle path is not a regular file: {bundle_path}"

    with open(bundle_path, "r", encoding="utf-8", errors="replace") as f:
        file_content = f.read()

    assert "-----BEGIN CERTIFICATE-----" in file_content
    assert "-----END CERTIFICATE-----" in file_content


def test_contents_returns_ca_bundle_text():
    """Assertion 2: certifi.core.contents returns the text content of the CA bundle containing PEM formatted root certificates."""
    contents = get_ca_bundle_contents()
    assert isinstance(contents, str)
    assert len(contents) > 0
    assert "-----BEGIN CERTIFICATE-----" in contents
    assert "-----END CERTIFICATE-----" in contents


def test_ssl_context_loads_ca_bundle():
    """Assertion 3: certifi.core.where path loads valid CA certificates into standard ssl SSLContext for TLS verification."""
    ctx = create_verified_ssl_context()
    assert ctx.verify_mode == ssl.CERT_REQUIRED
    ca_certs = ctx.get_ca_certs()
    assert isinstance(ca_certs, list)
    assert len(ca_certs) > 0

    bundle_path, exists, content_len, cert_count = inspect_ca_bundle()
    assert exists is True
    assert content_len > 0
    assert cert_count == len(ca_certs)


def main():
    test_where_returns_valid_pem_file()
    test_contents_returns_ca_bundle_text()
    test_ssl_context_loads_ca_bundle()
    print("All contract assertions passed successfully.")


if __name__ == "__main__":
    main()