58 lines
2.2 KiB
Go
58 lines
2.2 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
|
|
// Copyright 2018-present Vikunja and contributors. All rights reserved.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
package files
|
|
|
|
import (
|
|
"io"
|
|
"mime"
|
|
"net/http"
|
|
"strconv"
|
|
|
|
"code.vikunja.io/api/pkg/files"
|
|
)
|
|
|
|
// WriteFileDownload streams a loaded file (its .File reader must be open) to the
|
|
// response as an attachment download: http.ServeContent for seekable local files
|
|
// (Range + If-Modified-Since for free), a manual 304 + io.Copy otherwise. It does
|
|
// not close the reader; the caller owns it.
|
|
func WriteFileDownload(w http.ResponseWriter, r *http.Request, f *files.File) {
|
|
mimeToReturn := f.Mime
|
|
if mimeToReturn == "" {
|
|
mimeToReturn = "application/octet-stream"
|
|
}
|
|
w.Header().Set("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": f.Name}))
|
|
w.Header().Set("Content-Type", mimeToReturn)
|
|
w.Header().Set("Content-Length", strconv.FormatUint(f.Size, 10))
|
|
w.Header().Set("Last-Modified", f.Created.UTC().Format(http.TimeFormat))
|
|
|
|
// Local files are *os.File (seekable), so ServeContent gives Range +
|
|
// If-Modified-Since for free; s3 (and the in-memory test storage) return a
|
|
// non-seekable reader, so check If-Modified-Since manually and io.Copy.
|
|
if seeker, ok := f.File.(io.ReadSeeker); ok {
|
|
http.ServeContent(w, r, f.Name, f.Created, seeker)
|
|
return
|
|
}
|
|
|
|
if ifModSince := r.Header.Get("If-Modified-Since"); ifModSince != "" {
|
|
if t, parseErr := http.ParseTime(ifModSince); parseErr == nil && !f.Created.UTC().After(t) {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return
|
|
}
|
|
}
|
|
_, _ = io.Copy(w, f.File)
|
|
}
|