feat: add proof download

controller/files.go

@@ -84,6 +84,31 @@ func (f *FilesController) GetDownloadBy(cidString string) {
 	}
 }
 
+func (f *FilesController) GetProofBy(cidString string) {
+	ctx := f.Ctx
+
+	hashHex, valid := validateCid(cidString, true, ctx)
+
+	if !valid {
+		return
+	}
+
+	download, err := files.DownloadProof(hashHex)
+	if internalError(ctx, err) {
+		logger.Get().Debug("failed fetching file proof", zap.Error(err))
+		return
+	}
+
+	err = ctx.StreamWriter(func(w io.Writer) error {
+		_, err = io.Copy(w, download)
+		_ = download.(io.Closer).Close()
+		return err
+	})
+	if internalError(ctx, err) {
+		logger.Get().Debug("failed streaming file proof", zap.Error(err))
+	}
+}
+
 func (f *FilesController) GetStatusBy(cidString string) {
 	ctx := f.Ctx
 

service/files/files.go

@@ -198,6 +198,22 @@ func Download(hash string) (io.Reader, error) {
 	}
 }
 
+func DownloadProof(hash string) (io.Reader, error) {
+	uploadItem := db.Get().Model(&model.Upload{}).Where(&model.Upload{Hash: hash}).Row()
+
+	if uploadItem.Err() != nil {
+		logger.Get().Debug(ErrInvalidFile.Error(), zap.String("hash", hash))
+		return nil, ErrInvalidFile
+	}
+	fetch, err := client.R().SetDoNotParseResponse(true).Get(getWorkerProofUrl(hash))
+	if err != nil {
+		logger.Get().Error(ErrFailedFetchObject.Error(), zap.Error(err))
+		return nil, ErrFailedFetchObject
+	}
+
+	return fetch.RawBody(), nil
+}
+
 func Status(hash string) int {
 	var count int64