Trusted publishing: support for Bitbucket Pipelines

[okyrdan]

This would enable PyPI users with Bitbucket Pipelines CI/CD to leverage trusted publishing.

An example claim set from a Bitbucket Pipelines repository (anonymized but the structure is saved):

{
	"sub": "{d4e45493-4a33-477d-917b-a24e7e4bd39b}:{stepUuid}",
	"aud": "ari:cloud:bitbucket::workspace/03b741e3-cf4a-41f9-9a59-cec52e21bdc3",
	"stepUuid": "{xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx}",
        "deploymentEnvironmentUuid": "{xxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxxx}",
	"iss": "https://api.bitbucket.org/2.0/workspaces/atlassian/pipelines-config/identity/oidc",
	"repositoryUuid": "{d4e45493-4a33-477d-917b-a24e7e4bd39b}",
	"branchName": "xxxxxxxxx",
	"exp": "xxxxxxxxxx",
	"iat": "xxxxxxxxxx",
	"pipelineUuid": "{xxxxx-xxxxx-xxxx-xxxx-xxxxxxxxxxx}",
	"workspaceUuid": "{03b741e3-cf4a-41f9-9a59-cec52e21bdc3}"
}

For example, if user has a project at https://bitbucket.com/atlassian/pypi-publish with a pipeline defined in bitbucket-pipelines.yml file and a custom deployments named release, then user'd fill the form with the following fields:

• workspace or workspaceUuid
• repository or repositoryUuid
• pipeline_filename (i.e. bitbucket-pipelines.yml)
• deployments_environment (optional)

The guide with a configuration details: Integrate Pipelines with resource servers using OIDC | Bitbucket Cloud

Resource server-specific:

• Deploy on AWS using Bitbucket Pipelines OpenID Connect
• Accessing Google cloud resources from an OIDC identity provider

[di]

Thanks for filing the issue!

Per https://docs.pypi.org/trusted-publishers/internals/#how-do-i-become-a-trusted-publishing-provider:

Additionally, the claimset must support a customizable aud claim that can be set to the value pypi

Is that possible here? Based on my read of https://support.atlassian.com/bitbucket-cloud/docs/integrate-pipelines-with-resource-servers-using-oidc/, it seems like the audience claim is not configurable.