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package registry
import (
"io"
"net/http"
"net/url"
"github.com/docker/distribution"
digest "github.com/opencontainers/go-digest"
)
func (registry *Registry) DownloadBlob(repository string, digest digest.Digest) (io.ReadCloser, error) {
url := registry.url("/v2/%s/blobs/%s", repository, digest)
registry.Logf("registry.blob.download url=%s repository=%s digest=%s", url, repository, digest)
resp, err := registry.Client.Get(url)
if err != nil {
return nil, err
}
return resp.Body, nil
}
func (registry *Registry) UploadBlob(repository string, digest digest.Digest, content io.Reader) error {
uploadURL, err := registry.initiateUpload(repository)
if err != nil {
return err
}
q := uploadURL.Query()
q.Set("digest", digest.String())
uploadURL.RawQuery = q.Encode()
registry.Logf("registry.blob.upload url=%s repository=%s digest=%s", uploadURL, repository, digest)
upload, err := http.NewRequest("PUT", uploadURL.String(), content)
if err != nil {
return err
}
upload.Header.Set("Content-Type", "application/octet-stream")
_, err = registry.Client.Do(upload)
return err
}
func (registry *Registry) HasBlob(repository string, digest digest.Digest) (bool, error) {
checkURL := registry.url("/v2/%s/blobs/%s", repository, digest)
registry.Logf("registry.blob.check url=%s repository=%s digest=%s", checkURL, repository, digest)
resp, err := registry.Client.Head(checkURL)
if resp != nil {
defer resp.Body.Close()
}
if err == nil {
return resp.StatusCode == http.StatusOK, nil
}
urlErr, ok := err.(*url.Error)
if !ok {
return false, err
}
httpErr, ok := urlErr.Err.(*HTTPStatusError)
if !ok {
return false, err
}
if httpErr.Response.StatusCode == http.StatusNotFound {
return false, nil
}
return false, err
}
func (registry *Registry) BlobMetadata(repository string, digest digest.Digest) (distribution.Descriptor, error) {
checkURL := registry.url("/v2/%s/blobs/%s", repository, digest)
registry.Logf("registry.blob.check url=%s repository=%s digest=%s", checkURL, repository, digest)
resp, err := registry.Client.Head(checkURL)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return distribution.Descriptor{}, err
}
return distribution.Descriptor{
Digest: digest,
Size: resp.ContentLength,
}, nil
}
func (registry *Registry) initiateUpload(repository string) (*url.URL, error) {
initiateURL := registry.url("/v2/%s/blobs/uploads/", repository)
registry.Logf("registry.blob.initiate-upload url=%s repository=%s", initiateURL, repository)
resp, err := registry.Client.Post(initiateURL, "application/octet-stream", nil)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return nil, err
}
location := resp.Header.Get("Location")
locationURL, err := url.Parse(location)
if err != nil {
return nil, err
}
return locationURL, nil
}
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