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62 lines
1.4 KiB
62 lines
1.4 KiB
package clair
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import (
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"context"
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"crypto/tls"
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"io"
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"net/http"
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"os"
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"strings"
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log "github.com/sirupsen/logrus"
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)
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func retrieveLayerBlob(ctx context.Context, blobSha256 string, path string, headers map[string]string) (io.ReadCloser, error) {
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if strings.HasPrefix(path, "http://") || strings.HasPrefix(path, "https://") {
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return downloadLayerBlob(ctx, blobSha256, path, headers)
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}
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return loadLayerBlobFromFS(blobSha256)
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}
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func downloadLayerBlob(ctx context.Context, blobSha256 string, uri string, headers map[string]string) (io.ReadCloser, error) {
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request, err := http.NewRequest("GET", uri, nil)
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if err != nil {
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return nil, RetrieveBlobError
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}
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if headers != nil {
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for k, v := range headers {
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request.Header.Set(k, v)
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}
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}
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tr := &http.Transport{
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TLSClientConfig: &tls.Config{},
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Proxy: http.ProxyFromEnvironment,
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}
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client := &http.Client{Transport: tr}
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r, err := client.Do(request)
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if err != nil {
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log.WithError(err).Error("could not download layer")
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return nil, RetrieveBlobError
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}
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// Fail if we don't receive a 2xx HTTP status code.
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if is2xx(r.StatusCode) {
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log.WithField("status", r.StatusCode).Error("could not download layer: expected 2XX")
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return nil, RetrieveBlobError
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}
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return r.Body, nil
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}
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func is2xx(statusCode int) bool {
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return statusCode >= 200 && statusCode < 300
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}
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func loadLayerBlobFromFS(path string) (io.ReadCloser, error) {
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return os.Open(path)
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}
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