2020-08-19 23:36:46 +00:00
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package handler
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import (
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2021-01-14 17:39:48 +00:00
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"context"
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"fmt"
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2020-12-10 15:14:32 +00:00
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"io"
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2020-08-19 23:36:46 +00:00
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"net/http"
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"strconv"
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"strings"
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"sync"
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2020-08-19 23:36:46 +00:00
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"github.com/gorilla/mux"
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2021-05-18 11:10:08 +00:00
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"github.com/nspcc-dev/neofs-s3-gw/api"
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"github.com/nspcc-dev/neofs-s3-gw/api/layer"
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"go.uber.org/zap"
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)
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2020-12-10 15:14:32 +00:00
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type (
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detector struct {
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io.Writer
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sync.Once
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contentType string
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}
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)
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func newDetector(w io.Writer) *detector {
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return &detector{Writer: w}
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}
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func (d *detector) Write(data []byte) (int, error) {
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d.Once.Do(func() {
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if rw, ok := d.Writer.(http.ResponseWriter); ok {
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rw.WriteHeader(http.StatusOK)
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}
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d.contentType = http.DetectContentType(data)
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})
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return d.Writer.Write(data)
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}
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2021-01-14 17:39:48 +00:00
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func (h *handler) contentTypeFetcher(ctx context.Context, w io.Writer, info *layer.ObjectInfo) (string, error) {
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return h.contentTypeFetcherWithRange(ctx, w, info, nil)
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}
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func (h *handler) contentTypeFetcherWithRange(ctx context.Context, w io.Writer, info *layer.ObjectInfo, rangeParams *layer.RangeParams) (string, error) {
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if info.IsDir() {
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if rangeParams != nil {
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return "", fmt.Errorf("it is forbidden to request for a range in the directory")
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}
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return info.ContentType, nil
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}
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writer := newDetector(w)
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params := &layer.GetObjectParams{
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Bucket: info.Bucket,
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Object: info.Name,
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Writer: writer,
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Range: rangeParams,
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}
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// params.Length = inf.Size
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if err := h.obj.GetObject(ctx, params); err != nil {
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return "", err
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}
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return writer.contentType, nil
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}
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2021-06-24 11:10:00 +00:00
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func fetchRangeHeader(headers http.Header, fullSize uint64) (*layer.RangeParams, error) {
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const prefix = "bytes="
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rangeHeader := headers.Get("Range")
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if len(rangeHeader) == 0 {
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return nil, nil
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}
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if !strings.HasPrefix(rangeHeader, prefix) {
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return nil, fmt.Errorf("unknown unit in range header")
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}
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arr := strings.Split(strings.TrimPrefix(rangeHeader, prefix), "-")
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if len(arr) != 2 || (len(arr[0]) == 0 && len(arr[1]) == 0) {
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return nil, fmt.Errorf("unknown byte-range-set")
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}
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var end, start uint64
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var err0, err1 error
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base, bitSize := 10, 64
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if len(arr[0]) == 0 {
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end, err1 = strconv.ParseUint(arr[1], base, bitSize)
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start = fullSize - end
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end = fullSize - 1
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} else if len(arr[1]) == 0 {
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start, err0 = strconv.ParseUint(arr[0], base, bitSize)
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end = fullSize - 1
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} else {
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start, err0 = strconv.ParseUint(arr[0], base, bitSize)
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end, err1 = strconv.ParseUint(arr[1], base, bitSize)
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}
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if err0 != nil || err1 != nil || start > end {
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return nil, fmt.Errorf("invalid Range header")
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}
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return &layer.RangeParams{Start: start, End: end}, nil
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}
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func writeHeaders(h http.Header, info *layer.ObjectInfo) {
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h.Set("Content-Type", info.ContentType)
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h.Set("Last-Modified", info.Created.Format(http.TimeFormat))
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h.Set("Content-Length", strconv.FormatInt(info.Size, 10))
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for key, val := range info.Headers {
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h.Set("X-"+key, val)
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}
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}
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2020-08-19 23:36:46 +00:00
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func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
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var (
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err error
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inf *layer.ObjectInfo
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params *layer.RangeParams
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2020-08-19 23:36:46 +00:00
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req = mux.Vars(r)
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bkt = req["bucket"]
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obj = req["object"]
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rid = api.GetRequestID(r.Context())
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)
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if inf, err = h.obj.GetObjectInfo(r.Context(), bkt, obj); err != nil {
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writeError(w, r, h.log, "could not find object", rid, bkt, obj, err)
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return
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}
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if params, err = fetchRangeHeader(r.Header, uint64(inf.Size)); err != nil {
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writeError(w, r, h.log, "could not parse range header", rid, bkt, obj, err)
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return
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}
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if inf.ContentType, err = h.contentTypeFetcherWithRange(r.Context(), w, inf, params); err != nil {
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writeError(w, r, h.log, "could not get object", rid, bkt, obj, err)
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return
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}
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writeHeaders(w.Header(), inf)
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if params != nil {
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writeRangeHeaders(w, params, inf.Size)
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}
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}
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func writeRangeHeaders(w http.ResponseWriter, params *layer.RangeParams, size int64) {
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w.Header().Set("Accept-Ranges", "bytes")
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w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", params.Start, params.End, size))
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w.WriteHeader(http.StatusPartialContent)
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}
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func writeError(w http.ResponseWriter, r *http.Request, log *zap.Logger, msg, rid, bkt, obj string, err error) {
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log.Error(msg,
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zap.String("request_id", rid),
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zap.String("bucket_name", bkt),
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zap.String("object_name", obj),
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zap.Error(err))
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api.WriteErrorResponse(r.Context(), w, api.Error{
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Code: api.GetAPIError(api.ErrInternalError).Code,
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Description: err.Error(),
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HTTPStatusCode: http.StatusInternalServerError,
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}, r.URL)
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2020-08-19 23:36:46 +00:00
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}
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