2023-03-07 04:03:34 +08:00
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import os
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import sys
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from http import HTTPStatus
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from pathlib import Path
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from typing import NoReturn
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from urllib.parse import urlparse
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import id # pylint: disable=redefined-builtin
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import requests
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_GITHUB_STEP_SUMMARY = Path(os.getenv("GITHUB_STEP_SUMMARY"))
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2023-03-30 00:45:41 +08:00
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# The top-level error message that gets rendered.
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# This message wraps one of the other templates/messages defined below.
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_ERROR_SUMMARY_MESSAGE = """
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2023-04-03 20:30:44 +08:00
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Trusted publishing exchange failure:
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2023-03-30 00:45:41 +08:00
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{message}
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2023-04-01 13:41:16 +08:00
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You're seeing this because the action wasn't given the inputs needed to
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perform password-based or token-based authentication. If you intended to
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perform one of those authentication methods instead of trusted
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publishing, then you should double-check your secret configuration and variable
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names.
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2023-03-30 00:45:41 +08:00
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Read more about trusted publishers at https://docs.pypi.org/trusted-publishers/
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"""
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2023-03-07 04:03:34 +08:00
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# Rendered if OIDC identity token retrieval fails for any reason.
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_TOKEN_RETRIEVAL_FAILED_MESSAGE = """
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2023-04-03 20:30:44 +08:00
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OpenID Connect token retrieval failed: {identity_error}
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2023-03-07 04:03:34 +08:00
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This generally indicates a workflow configuration error, such as insufficient
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permissions. Make sure that your workflow has `id-token: write` configured
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at the job level, e.g.:
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```yaml
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permissions:
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id-token: write
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```
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Learn more at https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#adding-permissions-settings.
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"""
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# Rendered if the package index refuses the given OIDC token.
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_SERVER_REFUSED_TOKEN_EXCHANGE_MESSAGE = """
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Token request failed: the server refused the request for the following reasons:
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{reasons}
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"""
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# Rendered if the package index's token response isn't valid JSON.
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_SERVER_TOKEN_RESPONSE_MALFORMED_JSON = """
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Token request failed: the index produced an unexpected
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{status_code} response.
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This strongly suggests a server configuration or downtime issue; wait
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a few minutes and try again.
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"""
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# Rendered if the package index's token response isn't a valid API token payload.
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_SERVER_TOKEN_RESPONSE_MALFORMED_MESSAGE = """
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Token response error: the index gave us an invalid response.
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This strongly suggests a server configuration or downtime issue; wait
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a few minutes and try again.
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"""
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def die(msg: str) -> NoReturn:
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with _GITHUB_STEP_SUMMARY.open("a", encoding="utf-8") as io:
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2023-03-30 00:45:41 +08:00
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print(_ERROR_SUMMARY_MESSAGE.format(message=msg), file=io)
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2023-03-07 04:03:34 +08:00
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2023-04-03 22:14:57 +08:00
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print(f"::error::Trusted publishing exchange failure: {msg}", file=sys.stderr)
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2023-03-07 04:03:34 +08:00
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sys.exit(1)
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def debug(msg: str):
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print(f"::debug::{msg.title()}", file=sys.stderr)
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def get_normalized_input(name: str) -> str | None:
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name = f"INPUT_{name.upper()}"
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if val := os.getenv(name):
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return val
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return os.getenv(name.replace("-", "_"))
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def assert_successful_audience_call(resp: requests.Response, domain: str):
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if resp.ok:
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return
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match resp.status_code:
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case HTTPStatus.FORBIDDEN:
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# This index supports OIDC, but forbids the client from using
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# it (either because it's disabled, limited to a beta group, etc.)
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2023-04-03 20:30:44 +08:00
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die(
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f"audience retrieval failed: repository at {domain} has trusted publishing disabled",
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)
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2023-03-07 04:03:34 +08:00
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case HTTPStatus.NOT_FOUND:
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# This index does not support OIDC.
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die(
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"audience retrieval failed: repository at "
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2023-04-03 20:30:44 +08:00
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f"{domain} does not indicate trusted publishing support",
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2023-03-07 04:03:34 +08:00
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)
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case other:
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status = HTTPStatus(other)
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# Unknown: the index may or may not support OIDC, but didn't respond with
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# something we expect. This can happen if the index is broken, in maintenance mode,
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# misconfigured, etc.
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die(
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"audience retrieval failed: repository at "
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f"{domain} responded with unexpected {other}: {status.phrase}",
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)
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repository_url = get_normalized_input("repository-url")
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repository_domain = urlparse(repository_url).netloc
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token_exchange_url = f"https://{repository_domain}/_/oidc/github/mint-token"
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# Indices are expected to support `https://{domain}/_/oidc/audience`,
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# which tells OIDC exchange clients which audience to use.
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audience_url = f"https://{repository_domain}/_/oidc/audience"
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audience_resp = requests.get(audience_url)
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assert_successful_audience_call(audience_resp, repository_domain)
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oidc_audience = audience_resp.json()["audience"]
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2023-04-03 20:30:44 +08:00
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debug(f"selected trusted publishing exchange endpoint: {token_exchange_url}")
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2023-03-07 04:03:34 +08:00
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try:
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oidc_token = id.detect_credential(audience=oidc_audience)
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except id.IdentityError as identity_error:
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die(_TOKEN_RETRIEVAL_FAILED_MESSAGE.format(identity_error=identity_error))
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# Now we can do the actual token exchange.
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mint_token_resp = requests.post(
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token_exchange_url,
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json={"token": oidc_token},
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)
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try:
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mint_token_payload = mint_token_resp.json()
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except requests.JSONDecodeError:
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# Token exchange failure normally produces a JSON error response, but
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# we might have hit a server error instead.
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die(
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_SERVER_TOKEN_RESPONSE_MALFORMED_JSON.format(
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status_code=mint_token_resp.status_code,
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),
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)
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# On failure, the JSON response includes the list of errors that
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# occurred during minting.
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if not mint_token_resp.ok:
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reasons = "\n".join(
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f"* `{error['code']}`: {error['description']}"
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for error in mint_token_payload["errors"]
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)
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die(_SERVER_REFUSED_TOKEN_EXCHANGE_MESSAGE.format(reasons=reasons))
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pypi_token = mint_token_payload.get("token")
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if pypi_token is None:
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die(_SERVER_TOKEN_RESPONSE_MALFORMED_MESSAGE)
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# Mask the newly minted PyPI token, so that we don't accidentally leak it in logs.
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print(f"::add-mask::{pypi_token}", file=sys.stderr)
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# This final print will be captured by the subshell in `twine-upload.sh`.
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print(pypi_token)
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