Retrieve remote file size without the Content-Size header (#1537)
* Get downloaded file size regardless of the Content-Size header Signed-off-by: Florian Le Minoux <darkgallium+git@deuxfleurs.fr> * fixing lint issues * Don't exhaust memory for large files, don't limit more than necessary * Don't use errors.Wrap in download.go Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>main
parent
2386e0c7af
commit
da797c7998
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@ -109,7 +109,7 @@ func RemoveDir(dir types.Path, logger *log.Entry) {
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// WriteTempFile writes to a new temporary file.
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// The file is deleted if there was an error while writing.
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func WriteTempFile(
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ctx context.Context, reqReader io.Reader, maxFileSizeBytes config.FileSizeBytes, absBasePath config.Path,
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ctx context.Context, reqReader io.Reader, absBasePath config.Path,
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) (hash types.Base64Hash, size types.FileSizeBytes, path types.Path, err error) {
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size = -1
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logger := util.GetLogger(ctx)
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@ -124,18 +124,11 @@ func WriteTempFile(
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}
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}()
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// If the max_file_size_bytes configuration option is set to a positive
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// number then limit the upload to that size. Otherwise, just read the
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// whole file.
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limitedReader := reqReader
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if maxFileSizeBytes > 0 {
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limitedReader = io.LimitReader(reqReader, int64(maxFileSizeBytes))
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}
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// Hash the file data. The hash will be returned. The hash is useful as a
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// method of deduplicating files to save storage, as well as a way to conduct
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// integrity checks on the file data in the repository.
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hasher := sha256.New()
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teeReader := io.TeeReader(limitedReader, hasher)
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teeReader := io.TeeReader(reqReader, hasher)
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bytesWritten, err := io.Copy(tmpFileWriter, teeReader)
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if err != nil && err != io.EOF {
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RemoveDir(tmpDir, logger)
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@ -19,6 +19,7 @@ import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"mime"
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"net/http"
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"net/url"
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@ -214,7 +215,7 @@ func (r *downloadRequest) doDownload(
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ctx, r.MediaMetadata.MediaID, r.MediaMetadata.Origin,
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)
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if err != nil {
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return nil, errors.Wrap(err, "error querying the database")
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return nil, fmt.Errorf("db.GetMediaMetadata: %w", err)
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}
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if mediaMetadata == nil {
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if r.MediaMetadata.Origin == cfg.Matrix.ServerName {
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@ -253,16 +254,16 @@ func (r *downloadRequest) respondFromLocalFile(
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) (*types.MediaMetadata, error) {
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filePath, err := fileutils.GetPathFromBase64Hash(r.MediaMetadata.Base64Hash, absBasePath)
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if err != nil {
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return nil, errors.Wrap(err, "failed to get file path from metadata")
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return nil, fmt.Errorf("fileutils.GetPathFromBase64Hash: %w", err)
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}
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file, err := os.Open(filePath)
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defer file.Close() // nolint: errcheck, staticcheck, megacheck
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if err != nil {
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return nil, errors.Wrap(err, "failed to open file")
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return nil, fmt.Errorf("os.Open: %w", err)
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}
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stat, err := file.Stat()
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if err != nil {
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return nil, errors.Wrap(err, "failed to stat file")
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return nil, fmt.Errorf("file.Stat: %w", err)
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}
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if r.MediaMetadata.FileSizeBytes > 0 && int64(r.MediaMetadata.FileSizeBytes) != stat.Size() {
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@ -324,7 +325,7 @@ func (r *downloadRequest) respondFromLocalFile(
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w.Header().Set("Content-Security-Policy", contentSecurityPolicy)
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if _, err := io.Copy(w, responseFile); err != nil {
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return nil, errors.Wrap(err, "failed to copy from cache")
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return nil, fmt.Errorf("io.Copy: %w", err)
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}
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return responseMetadata, nil
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}
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@ -421,7 +422,7 @@ func (r *downloadRequest) getThumbnailFile(
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ctx, r.MediaMetadata.MediaID, r.MediaMetadata.Origin,
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)
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if err != nil {
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return nil, nil, errors.Wrap(err, "error looking up thumbnails")
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return nil, nil, fmt.Errorf("db.GetThumbnails: %w", err)
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}
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// If we get a thumbnailSize, a pre-generated thumbnail would be best but it is not yet generated.
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@ -459,12 +460,12 @@ func (r *downloadRequest) getThumbnailFile(
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thumbFile, err := os.Open(string(thumbPath))
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if err != nil {
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thumbFile.Close() // nolint: errcheck
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return nil, nil, errors.Wrap(err, "failed to open file")
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return nil, nil, fmt.Errorf("os.Open: %w", err)
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}
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thumbStat, err := thumbFile.Stat()
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if err != nil {
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thumbFile.Close() // nolint: errcheck
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return nil, nil, errors.Wrap(err, "failed to stat file")
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return nil, nil, fmt.Errorf("thumbFile.Stat: %w", err)
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}
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if types.FileSizeBytes(thumbStat.Size()) != thumbnail.MediaMetadata.FileSizeBytes {
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thumbFile.Close() // nolint: errcheck
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@ -491,7 +492,7 @@ func (r *downloadRequest) generateThumbnail(
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activeThumbnailGeneration, maxThumbnailGenerators, db, r.Logger,
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)
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if err != nil {
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return nil, errors.Wrap(err, "error creating thumbnail")
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return nil, fmt.Errorf("thumbnailer.GenerateThumbnail: %w", err)
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}
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if busy {
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return nil, nil
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@ -502,7 +503,7 @@ func (r *downloadRequest) generateThumbnail(
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thumbnailSize.Width, thumbnailSize.Height, thumbnailSize.ResizeMethod,
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)
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if err != nil {
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return nil, errors.Wrap(err, "error looking up thumbnail")
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return nil, fmt.Errorf("db.GetThumbnail: %w", err)
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}
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return thumbnail, nil
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}
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@ -543,7 +544,7 @@ func (r *downloadRequest) getRemoteFile(
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ctx, r.MediaMetadata.MediaID, r.MediaMetadata.Origin,
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)
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if err != nil {
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return errors.Wrap(err, "error querying the database.")
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return fmt.Errorf("db.GetMediaMetadata: %w", err)
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}
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if mediaMetadata == nil {
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@ -555,7 +556,7 @@ func (r *downloadRequest) getRemoteFile(
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cfg.MaxThumbnailGenerators,
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)
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if err != nil {
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return errors.Wrap(err, "error querying the database.")
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return fmt.Errorf("r.fetchRemoteFileAndStoreMetadata: %w", err)
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}
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} else {
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// If we have a record, we can respond from the local file
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@ -673,6 +674,43 @@ func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(
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return nil
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}
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func (r *downloadRequest) GetContentLengthAndReader(contentLengthHeader string, body *io.ReadCloser, maxFileSizeBytes config.FileSizeBytes) (int64, io.Reader, error) {
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reader := *body
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var contentLength int64
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if contentLengthHeader != "" {
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// A Content-Length header is provided. Let's try to parse it.
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parsedLength, parseErr := strconv.ParseInt(contentLengthHeader, 10, 64)
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if parseErr != nil {
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r.Logger.WithError(parseErr).Warn("Failed to parse content length")
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return 0, nil, fmt.Errorf("strconv.ParseInt: %w", parseErr)
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}
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if parsedLength > int64(maxFileSizeBytes) {
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return 0, nil, fmt.Errorf(
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"remote file size (%d bytes) exceeds locally configured max media size (%d bytes)",
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parsedLength, maxFileSizeBytes,
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)
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}
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// We successfully parsed the Content-Length, so we'll return a limited
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// reader that restricts us to reading only up to this size.
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reader = ioutil.NopCloser(io.LimitReader(*body, parsedLength))
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contentLength = parsedLength
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} else {
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// Content-Length header is missing. If we have a maximum file size
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// configured then we'll just make sure that the reader is limited to
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// that size. We'll return a zero content length, but that's OK, since
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// ultimately it will get rewritten later when the temp file is written
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// to disk.
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if maxFileSizeBytes > 0 {
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reader = ioutil.NopCloser(io.LimitReader(*body, int64(maxFileSizeBytes)))
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}
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contentLength = 0
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}
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return contentLength, reader, nil
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}
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func (r *downloadRequest) fetchRemoteFile(
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ctx context.Context,
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client *gomatrixserverlib.Client,
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@ -692,16 +730,18 @@ func (r *downloadRequest) fetchRemoteFile(
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}
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defer resp.Body.Close() // nolint: errcheck
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// get metadata from request and set metadata on response
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contentLength, err := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64)
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if err != nil {
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r.Logger.WithError(err).Warn("Failed to parse content length")
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return "", false, errors.Wrap(err, "invalid response from remote server")
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// The reader returned here will be limited either by the Content-Length
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// and/or the configured maximum media size.
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contentLength, reader, parseErr := r.GetContentLengthAndReader(resp.Header.Get("Content-Length"), &resp.Body, maxFileSizeBytes)
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if parseErr != nil {
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return "", false, parseErr
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}
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if contentLength > int64(maxFileSizeBytes) {
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// TODO: Bubble up this as a 413
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return "", false, fmt.Errorf("remote file is too large (%v > %v bytes)", contentLength, maxFileSizeBytes)
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}
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r.MediaMetadata.FileSizeBytes = types.FileSizeBytes(contentLength)
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r.MediaMetadata.ContentType = types.ContentType(resp.Header.Get("Content-Type"))
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@ -728,7 +768,7 @@ func (r *downloadRequest) fetchRemoteFile(
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// method of deduplicating files to save storage, as well as a way to conduct
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// integrity checks on the file data in the repository.
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// Data is truncated to maxFileSizeBytes. Content-Length was reported as 0 < Content-Length <= maxFileSizeBytes so this is OK.
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hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(ctx, resp.Body, maxFileSizeBytes, absBasePath)
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hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(ctx, reader, absBasePath)
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if err != nil {
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r.Logger.WithError(err).WithFields(log.Fields{
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"MaxFileSizeBytes": maxFileSizeBytes,
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@ -747,7 +787,7 @@ func (r *downloadRequest) fetchRemoteFile(
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// The database is the source of truth so we need to have moved the file first
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finalPath, duplicate, err := fileutils.MoveFileWithHashCheck(tmpDir, r.MediaMetadata, absBasePath, r.Logger)
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if err != nil {
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return "", false, errors.Wrap(err, "failed to move file")
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return "", false, fmt.Errorf("fileutils.MoveFileWithHashCheck: %w", err)
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}
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if duplicate {
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r.Logger.WithField("dst", finalPath).Info("File was stored previously - discarding duplicate")
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@ -147,7 +147,7 @@ func (r *uploadRequest) doUpload(
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// r.storeFileAndMetadata(ctx, tmpDir, ...)
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// before you return from doUpload else we will leak a temp file. We could make this nicer with a `WithTransaction` style of
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// nested function to guarantee either storage or cleanup.
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hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(ctx, reqReader, *cfg.MaxFileSizeBytes, cfg.AbsBasePath)
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hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(ctx, reqReader, cfg.AbsBasePath)
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if err != nil {
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r.Logger.WithError(err).WithFields(log.Fields{
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"MaxFileSizeBytes": *cfg.MaxFileSizeBytes,
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