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Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,179 @@ | ||
| // Copyright 2018-2020 CERN | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // In applying this license, CERN does not waive the privileges and immunities | ||
| // granted to it by virtue of its status as an Intergovernmental Organization | ||
| // or submit itself to any jurisdiction. | ||
|
|
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| // Package download provides a library to handle file download requests. | ||
| package download | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "mime/multipart" | ||
| "net/http" | ||
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| provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1" | ||
| "github.com/cs3org/reva/pkg/appctx" | ||
| "github.com/cs3org/reva/pkg/errtypes" | ||
| "github.com/cs3org/reva/pkg/storage" | ||
| "github.com/rs/zerolog" | ||
| ) | ||
|
|
||
| // GetOrHeadFile returns the requested file content | ||
| func GetOrHeadFile(w http.ResponseWriter, r *http.Request, fs storage.FS) { | ||
| ctx := r.Context() | ||
| sublog := appctx.GetLogger(ctx).With().Str("datatx", "tus").Logger() | ||
|
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| var fn string | ||
| files, ok := r.URL.Query()["filename"] | ||
| if !ok || len(files[0]) < 1 { | ||
| fn = r.URL.Path | ||
| } else { | ||
| fn = files[0] | ||
| } | ||
|
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| ref := &provider.Reference{Spec: &provider.Reference_Path{Path: fn}} | ||
|
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| // TODO check preconditions like If-Range, If-Match ... | ||
|
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| var md *provider.ResourceInfo | ||
| var err error | ||
|
|
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| // do a stat to set a Content-Length header | ||
|
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| if md, err = fs.GetMD(ctx, ref, nil); err != nil { | ||
| handleError(w, &sublog, err) | ||
| return | ||
| } | ||
|
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| var ranges []HTTPRange | ||
|
|
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| if r.Header.Get("Range") != "" { | ||
| ranges, err = ParseRange(r.Header.Get("Range"), int64(md.Size)) | ||
| if err != nil { | ||
| if err == ErrNoOverlap { | ||
| w.Header().Set("Content-Range", fmt.Sprintf("bytes */%d", md.Size)) | ||
| } | ||
| w.WriteHeader(http.StatusRequestedRangeNotSatisfiable) | ||
| fmt.Fprintln(w, err) | ||
| return | ||
| } | ||
| if SumRangesSize(ranges) > int64(md.Size) { | ||
| // The total number of bytes in all the ranges | ||
| // is larger than the size of the file by | ||
| // itself, so this is probably an attack, or a | ||
| // dumb client. Ignore the range request. | ||
| ranges = nil | ||
| } | ||
| } | ||
|
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| content, err := fs.Download(ctx, ref) | ||
| if err != nil { | ||
| handleError(w, &sublog, err) | ||
| return | ||
| } | ||
| defer content.Close() | ||
|
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| code := http.StatusOK | ||
|
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| sendSize := int64(md.Size) | ||
| var sendContent io.Reader = content | ||
| var s io.Seeker | ||
| if len(ranges) > 0 { | ||
| sublog.Debug().Int64("start", ranges[0].Start).Int64("length", ranges[0].Length).Msg("datasvc: range request") | ||
| if s, ok = content.(io.Seeker); !ok { | ||
| sublog.Error().Int64("start", ranges[0].Start).Int64("length", ranges[0].Length).Msg("datasvc: ReadCloser is not seekable") | ||
| w.WriteHeader(http.StatusRequestedRangeNotSatisfiable) | ||
| return | ||
| } | ||
| switch { | ||
| case len(ranges) == 1: | ||
| // RFC 7233, Section 4.1: | ||
| // "If a single part is being transferred, the server | ||
| // generating the 206 response MUST generate a | ||
| // Content-Range header field, describing what range | ||
| // of the selected representation is enclosed, and a | ||
| // payload consisting of the range. | ||
| // ... | ||
| // A server MUST NOT generate a multipart response to | ||
| // a request for a single range, since a client that | ||
| // does not request multiple parts might not support | ||
| // multipart responses." | ||
| ra := ranges[0] | ||
| if _, err := s.Seek(ra.Start, io.SeekStart); err != nil { | ||
| sublog.Error().Err(err).Int64("start", ra.Start).Int64("length", ra.Length).Msg("datasvc: content is not seekable") | ||
| w.WriteHeader(http.StatusRequestedRangeNotSatisfiable) | ||
| return | ||
| } | ||
| sendSize = ra.Length | ||
| code = http.StatusPartialContent | ||
| w.Header().Set("Content-Range", ra.ContentRange(int64(md.Size))) | ||
| case len(ranges) > 1: | ||
| sendSize = RangesMIMESize(ranges, md.MimeType, int64(md.Size)) | ||
| code = http.StatusPartialContent | ||
|
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| pr, pw := io.Pipe() | ||
| mw := multipart.NewWriter(pw) | ||
| w.Header().Set("Content-Type", "multipart/byteranges; boundary="+mw.Boundary()) | ||
| sendContent = pr | ||
| defer pr.Close() // cause writing goroutine to fail and exit if CopyN doesn't finish. | ||
| go func() { | ||
| for _, ra := range ranges { | ||
| part, err := mw.CreatePart(ra.MimeHeader(md.MimeType, int64(md.Size))) | ||
| if err != nil { | ||
| _ = pw.CloseWithError(err) // CloseWithError always returns nil | ||
| return | ||
| } | ||
| if _, err := s.Seek(ra.Start, io.SeekStart); err != nil { | ||
| _ = pw.CloseWithError(err) // CloseWithError always returns nil | ||
| return | ||
| } | ||
| if _, err := io.CopyN(part, content, ra.Length); err != nil { | ||
| _ = pw.CloseWithError(err) // CloseWithError always returns nil | ||
| return | ||
| } | ||
| } | ||
| mw.Close() | ||
| pw.Close() | ||
| }() | ||
|
|
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| } | ||
| } | ||
| w.WriteHeader(code) | ||
|
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| if r.Method != "HEAD" { | ||
| _, err = io.CopyN(w, sendContent, sendSize) | ||
| if err != nil { | ||
| sublog.Error().Err(err).Msg("error copying data to response") | ||
| return | ||
| } | ||
| } | ||
|
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| } | ||
|
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| func handleError(w http.ResponseWriter, log *zerolog.Logger, err error) { | ||
| switch err.(type) { | ||
| case errtypes.IsNotFound: | ||
| log.Debug().Err(err).Msg("datasvc: file not found") | ||
| w.WriteHeader(http.StatusNotFound) | ||
| case errtypes.IsPermissionDenied: | ||
| log.Debug().Err(err).Msg("datasvc: permission denied") | ||
| w.WriteHeader(http.StatusForbidden) | ||
| default: | ||
| log.Error().Err(err).Msg("datasvc: error downloading file") | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| } | ||
| } |
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