62 lines
2.4 KiB
Go
62 lines
2.4 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package files
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import (
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"io"
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"mime"
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"net/http"
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"strconv"
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"code.vikunja.io/api/pkg/files"
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)
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// WriteFileDownload streams a loaded file (its .File reader must be open) to the
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// response as an attachment download: http.ServeContent for seekable local files
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// (Range + If-Modified-Since for free), a manual 304 + io.Copy otherwise. It does
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// not close the reader; the caller owns it.
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func WriteFileDownload(w http.ResponseWriter, r *http.Request, f *files.File) {
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// Downloads must never be cached. no-cache overrides the global no-store
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// directive so revalidation (If-Modified-Since) still works.
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w.Header().Set("Cache-Control", "no-cache")
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mimeToReturn := f.Mime
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if mimeToReturn == "" {
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mimeToReturn = "application/octet-stream"
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}
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w.Header().Set("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": f.Name}))
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w.Header().Set("Content-Type", mimeToReturn)
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w.Header().Set("Content-Length", strconv.FormatUint(f.Size, 10))
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w.Header().Set("Last-Modified", f.Created.UTC().Format(http.TimeFormat))
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// Local files are *os.File (seekable), so ServeContent gives Range +
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// If-Modified-Since for free; s3 (and the in-memory test storage) return a
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// non-seekable reader, so check If-Modified-Since manually and io.Copy.
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if seeker, ok := f.File.(io.ReadSeeker); ok {
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http.ServeContent(w, r, f.Name, f.Created, seeker)
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return
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}
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if ifModSince := r.Header.Get("If-Modified-Since"); ifModSince != "" {
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if t, parseErr := http.ParseTime(ifModSince); parseErr == nil && !f.Created.UTC().After(t) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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}
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_, _ = io.Copy(w, f.File)
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}
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