95 lines
2.7 KiB
Go
95 lines
2.7 KiB
Go
// Package serve deals with serving objects over HTTP
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package serve
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import (
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"fmt"
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"io"
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"net/http"
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"path"
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"strconv"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/accounting"
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)
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// Object serves an fs.Object via HEAD or GET
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func Object(w http.ResponseWriter, r *http.Request, o fs.Object) {
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if r.Method != "HEAD" && r.Method != "GET" {
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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return
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}
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// Show that we accept ranges
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w.Header().Set("Accept-Ranges", "bytes")
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// Set content length since we know how long the object is
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if o.Size() >= 0 {
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w.Header().Set("Content-Length", strconv.FormatInt(o.Size(), 10))
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}
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// Set content type
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mimeType := fs.MimeType(r.Context(), o)
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if mimeType == "application/octet-stream" && path.Ext(o.Remote()) == "" {
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// Leave header blank so http server guesses
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} else {
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w.Header().Set("Content-Type", mimeType)
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}
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// Set last modified
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modTime := o.ModTime(r.Context())
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w.Header().Set("Last-Modified", modTime.UTC().Format(http.TimeFormat))
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if r.Method == "HEAD" {
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return
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}
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// Decode Range request if present
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code := http.StatusOK
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size := o.Size()
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var options []fs.OpenOption
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if rangeRequest := r.Header.Get("Range"); rangeRequest != "" {
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//fs.Debugf(nil, "Range: request %q", rangeRequest)
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option, err := fs.ParseRangeOption(rangeRequest)
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if err != nil {
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fs.Debugf(o, "Get request parse range request error: %v", err)
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http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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return
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}
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options = append(options, option)
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offset, limit := option.Decode(o.Size())
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end := o.Size() // exclusive
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if limit >= 0 {
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end = offset + limit
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}
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if end > o.Size() {
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end = o.Size()
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}
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size = end - offset
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// fs.Debugf(nil, "Range: offset=%d, limit=%d, end=%d, size=%d (object size %d)", offset, limit, end, size, o.Size())
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// Content-Range: bytes 0-1023/146515
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w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", offset, end-1, o.Size()))
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// fs.Debugf(nil, "Range: Content-Range: %q", w.Header().Get("Content-Range"))
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code = http.StatusPartialContent
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}
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w.Header().Set("Content-Length", strconv.FormatInt(size, 10))
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file, err := o.Open(r.Context(), options...)
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if err != nil {
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fs.Debugf(o, "Get request open error: %v", err)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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tr := accounting.Stats(r.Context()).NewTransfer(o)
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defer func() {
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tr.Done(r.Context(), err)
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}()
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in := tr.Account(r.Context(), file) // account the transfer (no buffering)
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w.WriteHeader(code)
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n, err := io.Copy(w, in)
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if err != nil {
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fs.Errorf(o, "Didn't finish writing GET request (wrote %d/%d bytes): %v", n, size, err)
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return
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}
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}
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