Example #1
0
// ServeBlobRef serves a blob.
func ServeBlobRef(rw http.ResponseWriter, req *http.Request, blobRef blob.Ref, fetcher blob.Fetcher) {
	rc, size, err := fetcher.Fetch(blobRef)
	switch err {
	case nil:
		break
	case os.ErrNotExist:
		rw.WriteHeader(http.StatusNotFound)
		fmt.Fprintf(rw, "Blob %q not found", blobRef)
		return
	default:
		httputil.ServeError(rw, req, err)
		return
	}
	defer rc.Close()
	rw.Header().Set("Content-Type", "application/octet-stream")

	var content io.ReadSeeker = readerutil.NewFakeSeeker(rc, int64(size))
	rangeHeader := req.Header.Get("Range") != ""
	const small = 32 << 10
	var b *blob.Blob
	if rangeHeader || size < small {
		// Slurp to memory, so we can actually seek on it (for Range support),
		// or if we're going to be showing it in the browser (below).
		b, err = blob.FromReader(blobRef, rc, size)
		if err != nil {
			httputil.ServeError(rw, req, err)
			return
		}
		content = b.Open()
	}
	if !rangeHeader && size < small {
		// If it's small and all UTF-8, assume it's text and
		// just render it in the browser.  This is more for
		// demos/debuggability than anything else.  It isn't
		// part of the spec.
		if b.IsUTF8() {
			rw.Header().Set("Content-Type", "text/plain; charset=utf-8")
		}
	}
	http.ServeContent(rw, req, "", dummyModTime, content)
}
Example #2
0
func verifySizeAndHash(t *testing.T, blob *blob.Blob) {
	hash := sha1.New()
	r := blob.Open()
	n, err := io.Copy(hash, r)
	if err != nil {
		t.Fatal(err)
	}
	r.Close()

	if uint32(n) != blob.Size() {
		t.Fatalf("read %d bytes from blob %v; want %v", n, blob.Ref(), blob.Size())
	}

	if !blob.SizedRef().HashMatches(hash) {
		t.Fatalf("read wrong bytes from blobref %v (digest mismatch)", blob.Ref())
	}
}