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Allow some content types to be inlined (#3274)
"Shamelessly" stolen from https://github.com/matrix-org/synapse/pull/15988
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@ -63,6 +63,40 @@ type downloadRequest struct {
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DownloadFilename string
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}
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// Taken from: https://github.com/matrix-org/synapse/blob/c3627d0f99ed5a23479305dc2bd0e71ca25ce2b1/synapse/media/_base.py#L53C1-L84
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// A list of all content types that are "safe" to be rendered inline in a browser.
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var allowInlineTypes = map[types.ContentType]struct{}{
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"text/css": {},
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"text/plain": {},
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"text/csv": {},
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"application/json": {},
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"application/ld+json": {},
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// We allow some media files deemed as safe, which comes from the matrix-react-sdk.
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// https://github.com/matrix-org/matrix-react-sdk/blob/a70fcfd0bcf7f8c85986da18001ea11597989a7c/src/utils/blobs.ts#L51
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// SVGs are *intentionally* omitted.
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"image/jpeg": {},
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"image/gif": {},
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"image/png": {},
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"image/apng": {},
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"image/webp": {},
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"image/avif": {},
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"video/mp4": {},
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"video/webm": {},
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"video/ogg": {},
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"video/quicktime": {},
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"audio/mp4": {},
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"audio/webm": {},
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"audio/aac": {},
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"audio/mpeg": {},
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"audio/ogg": {},
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"audio/wave": {},
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"audio/wav": {},
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"audio/x-wav": {},
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"audio/x-pn-wav": {},
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"audio/flac": {},
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"audio/x-flac": {},
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}
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// Download implements GET /download and GET /thumbnail
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// Files from this server (i.e. origin == cfg.ServerName) are served directly
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// Files from remote servers (i.e. origin != cfg.ServerName) are cached locally.
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@ -353,7 +387,7 @@ func (r *downloadRequest) addDownloadFilenameToHeaders(
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}
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if len(filename) == 0 {
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w.Header().Set("Content-Disposition", "attachment")
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w.Header().Set("Content-Disposition", contentDispositionFor(""))
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return nil
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}
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@ -383,20 +417,21 @@ func (r *downloadRequest) addDownloadFilenameToHeaders(
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unescaped = strings.ReplaceAll(unescaped, `\`, `\\"`)
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unescaped = strings.ReplaceAll(unescaped, `"`, `\"`)
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disposition := contentDispositionFor(responseMetadata.ContentType)
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if isASCII {
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// For ASCII filenames, we should only quote the filename if
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// it needs to be done, e.g. it contains a space or a character
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// that would otherwise be parsed as a control character in the
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// Content-Disposition header
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w.Header().Set("Content-Disposition", fmt.Sprintf(
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`attachment; filename=%s%s%s`,
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quote, unescaped, quote,
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`%s; filename=%s%s%s`,
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disposition, quote, unescaped, quote,
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))
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} else {
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// For UTF-8 filenames, we quote always, as that's the standard
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w.Header().Set("Content-Disposition", fmt.Sprintf(
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`attachment; filename*=utf-8''%s`,
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url.QueryEscape(unescaped),
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`%s; filename*=utf-8''%s`,
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disposition, url.QueryEscape(unescaped),
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))
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}
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@ -808,3 +843,12 @@ func (r *downloadRequest) fetchRemoteFile(
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return types.Path(finalPath), duplicate, nil
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}
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// contentDispositionFor returns the Content-Disposition for a given
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// content type.
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func contentDispositionFor(contentType types.ContentType) string {
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if _, ok := allowInlineTypes[contentType]; ok {
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return "inline"
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}
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return "attachment"
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}
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13
mediaapi/routing/download_test.go
Normal file
13
mediaapi/routing/download_test.go
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@ -0,0 +1,13 @@
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package routing
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func Test_dispositionFor(t *testing.T) {
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assert.Equal(t, "attachment", contentDispositionFor(""), "empty content type")
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assert.Equal(t, "attachment", contentDispositionFor("image/svg"), "image/svg")
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assert.Equal(t, "inline", contentDispositionFor("image/jpeg"), "image/jpg")
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}
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