frostfs-s3-gw/api/handler/get.go
Evgeniy Kulikov 776eed76fb Add writer detector
WriterDetector allows to fetch ContentType and write status response, when streaming content

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>
2020-12-10 18:14:32 +03:00

96 lines
2 KiB
Go

package handler
import (
"io"
"net/http"
"strconv"
"sync"
"github.com/gorilla/mux"
"github.com/nspcc-dev/neofs-s3-gate/api"
"github.com/nspcc-dev/neofs-s3-gate/api/layer"
"go.uber.org/zap"
)
type (
detector struct {
io.Writer
sync.Once
contentType string
}
)
func newDetector(w io.Writer) *detector {
return &detector{Writer: w}
}
func (d *detector) Write(data []byte) (int, error) {
d.Once.Do(func() {
if rw, ok := d.Writer.(http.ResponseWriter); ok {
rw.WriteHeader(http.StatusOK)
}
d.contentType = http.DetectContentType(data)
})
return d.Writer.Write(data)
}
func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
inf *layer.ObjectInfo
req = mux.Vars(r)
bkt = req["bucket"]
obj = req["object"]
rid = api.GetRequestID(r.Context())
)
if inf, err = h.obj.GetObjectInfo(r.Context(), bkt, obj); err != nil {
h.log.Error("could not find object",
zap.String("request_id", rid),
zap.String("bucket_name", bkt),
zap.String("object_name", obj),
zap.Error(err))
api.WriteErrorResponse(r.Context(), w, api.Error{
Code: api.GetAPIError(api.ErrInternalError).Code,
Description: err.Error(),
HTTPStatusCode: http.StatusInternalServerError,
}, r.URL)
return
}
writer := newDetector(w)
params := &layer.GetObjectParams{
Bucket: inf.Bucket,
Object: inf.Name,
Writer: writer,
}
// params.Length = inf.Size
if err = h.obj.GetObject(r.Context(), params); err != nil {
h.log.Error("could not get object",
zap.String("request_id", rid),
zap.String("bucket_name", bkt),
zap.String("object_name", obj),
zap.Error(err))
api.WriteErrorResponse(r.Context(), w, api.Error{
Code: api.GetAPIError(api.ErrInternalError).Code,
Description: err.Error(),
HTTPStatusCode: http.StatusInternalServerError,
}, r.URL)
return
}
w.Header().Set("Content-Type", writer.contentType)
w.Header().Set("Last-Modified", inf.Created.Format(http.TimeFormat))
w.Header().Set("Content-Length", strconv.FormatInt(inf.Size, 10))
}