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72 lines
2.6 KiB
72 lines
2.6 KiB
// Copyright 2019 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package remote
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/google/go-containerregistry/pkg/authn"
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"github.com/google/go-containerregistry/pkg/name"
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"github.com/google/go-containerregistry/pkg/v1/remote/transport"
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)
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// CheckPushPermission returns an error if the given keychain cannot authorize
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// a push operation to the given ref.
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//
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// This can be useful to check whether the caller has permission to push an
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// image before doing work to construct the image.
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//
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// TODO(#412): Remove the need for this method.
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func CheckPushPermission(ref name.Reference, kc authn.Keychain, t http.RoundTripper) error {
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auth, err := kc.Resolve(ref.Context().Registry)
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if err != nil {
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return fmt.Errorf("resolving authorization for %v failed: %w", ref.Context().Registry, err)
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}
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scopes := []string{ref.Scope(transport.PushScope)}
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tr, err := transport.NewWithContext(context.TODO(), ref.Context().Registry, auth, t, scopes)
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if err != nil {
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return fmt.Errorf("creating push check transport for %v failed: %w", ref.Context().Registry, err)
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}
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// TODO(jasonhall): Against GCR, just doing the token handshake is
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// enough, but this doesn't extend to Dockerhub
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// (https://github.com/docker/hub-feedback/issues/1771), so we actually
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// need to initiate an upload to tell whether the credentials can
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// authorize a push. Figure out how to return early here when we can,
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// to avoid a roundtrip for spec-compliant registries.
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w := writer{
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repo: ref.Context(),
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client: &http.Client{Transport: tr},
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}
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loc, _, err := w.initiateUpload(context.Background(), "", "", "")
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if loc != "" {
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// Since we're only initiating the upload to check whether we
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// can, we should attempt to cancel it, in case initiating
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// reserves some resources on the server. We shouldn't wait for
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// cancelling to complete, and we don't care if it fails.
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go w.cancelUpload(loc)
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}
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return err
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}
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func (w *writer) cancelUpload(loc string) {
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req, err := http.NewRequest(http.MethodDelete, loc, nil)
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if err != nil {
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return
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}
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_, _ = w.client.Do(req)
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}
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