Dart 2.15 doesn't send oauth credentials to third-party servers.

[sigurdm]

See:

• GHSA-r32f-vhjp-qhj7
• null is not an uploader of XXX with Dart 2.15 dart-lang/pub#3253

Unpub should consider implementing a form of token authentication:

• https://dart.dev/tools/pub/cmd/pub-token
• https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#authentication

[talisk]

Hi. We are working on the migration. Before the new plan is finalized, you can copy the token from "/Users/username/Library/Application Support/dart/pub-credentials.json"(macOS) by hand, and call dart pub token add https://his_private_pub_host, paste the token here.

[talisk]

@sigurdm Hi, I have written a cli app named unpub_auth. Feel free to review the PR and tell me suggestions. #50