node.js - How to list images and tags from the gcr.io Docker Registry using the HTTP API?

Question

I'm trying to fetch a list of available images and their tags from Google Container Registry (gcr.io) in Node.js.

I first use google-auto-auth to optain a token with scope https://www.googleapis.com/auth/devstorage.read_write, and I exchange that token for a gcr.io token like so:

axios.get('https://gcr.io/v2/token?service=gcr.io', {
  auth: {
    username: '_token',
    password: token // token I got from `google-auto-auth`
  }
})

I then try to use this to call the v2/_catalog endpoint:

axios.get('https://gcr.io/v2/_catalog', {
  headers: {
    Authorization: `Bearer ${gcrToken}`
  }
})

And I get the following error:

{ 
  errors: [ { code: 'DENIED', message: 'Failed to retrieve projects.' } ] 
}

Fair enough, it must require my project ID, but where am I supposed to provide it?

Just to see if I could get anything else working, I tried:

axios.get('https://gcr.io/v2/my-project-id/my-image/tags/list', {
  headers: {
    Authorization: `Bearer ${gcrToken}`
  }
})

And I get the following back:

{ 
  errors: [ 
    { 
      code: 'NAME_INVALID', 
      message: 'Requested repository does not match bearer token resource: my-project-id/my-image' 
    } 
  ] 
}

How can I read image info from gcr.io?

Answer 1

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