forked from TrueCloudLab/distribution
4acda57e05
middleware concept. This also breaks the dependency the storage package had on goamz Signed-off-by: David Lawrence <david.lawrence@docker.com> (github: endophage)
49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package storage
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import (
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"net/http"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/digest"
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)
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// LayerRead implements Layer and provides facilities for reading and
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// seeking.
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type layerReader struct {
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fileReader
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digest digest.Digest
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}
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var _ distribution.Layer = &layerReader{}
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func (lrs *layerReader) Path() string {
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return lrs.path
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}
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func (lrs *layerReader) Digest() digest.Digest {
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return lrs.digest
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}
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func (lrs *layerReader) Length() int64 {
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return lrs.size
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}
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func (lrs *layerReader) CreatedAt() time.Time {
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return lrs.modtime
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}
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// Close the layer. Should be called when the resource is no longer needed.
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func (lrs *layerReader) Close() error {
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return lrs.closeWithErr(distribution.ErrLayerClosed)
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}
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func (lrs *layerReader) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Docker-Content-Digest", lrs.digest.String())
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if url, err := lrs.fileReader.driver.URLFor(lrs.Path(), map[string]interface{}{}); err == nil {
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http.Redirect(w, r, url, http.StatusTemporaryRedirect)
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}
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http.ServeContent(w, r, lrs.Digest().String(), lrs.CreatedAt(), lrs)
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}
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