frostfs-s3-gw/api/handler/get.go

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package handler
import (
"context"
"fmt"
"io"
"net/http"
"strconv"
"strings"
"sync"
"github.com/gorilla/mux"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/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) contentTypeFetcher(ctx context.Context, w io.Writer, info *layer.ObjectInfo) (string, error) {
return h.contentTypeFetcherWithRange(ctx, w, info, nil)
}
func (h *handler) contentTypeFetcherWithRange(ctx context.Context, w io.Writer, info *layer.ObjectInfo, rangeParams *layer.RangeParams) (string, error) {
if info.IsDir() {
if rangeParams != nil {
return "", fmt.Errorf("it is forbidden to request for a range in the directory")
}
return info.ContentType, nil
}
writer := newDetector(w)
params := &layer.GetObjectParams{
Bucket: info.Bucket,
Object: info.Name,
Writer: writer,
Range: rangeParams,
}
// params.Length = inf.Size
if err := h.obj.GetObject(ctx, params); err != nil {
return "", err
}
return writer.contentType, nil
}
func fetchRangeHeader(headers http.Header, fullSize uint64) (*layer.RangeParams, error) {
const prefix = "bytes="
rangeHeader := headers.Get("Range")
if len(rangeHeader) == 0 {
return nil, nil
}
if !strings.HasPrefix(rangeHeader, prefix) {
return nil, fmt.Errorf("unknown unit in range header")
}
arr := strings.Split(strings.TrimPrefix(rangeHeader, prefix), "-")
if len(arr) != 2 || (len(arr[0]) == 0 && len(arr[1]) == 0) {
return nil, fmt.Errorf("unknown byte-range-set")
}
var end, start uint64
var err0, err1 error
base, bitSize := 10, 64
if len(arr[0]) == 0 {
end, err1 = strconv.ParseUint(arr[1], base, bitSize)
start = fullSize - end
end = fullSize - 1
} else if len(arr[1]) == 0 {
start, err0 = strconv.ParseUint(arr[0], base, bitSize)
end = fullSize - 1
} else {
start, err0 = strconv.ParseUint(arr[0], base, bitSize)
end, err1 = strconv.ParseUint(arr[1], base, bitSize)
}
if err0 != nil || err1 != nil || start > end {
return nil, fmt.Errorf("invalid Range header")
}
return &layer.RangeParams{Start: start, End: end}, nil
}
func writeHeaders(h http.Header, info *layer.ObjectInfo) {
h.Set("Content-Type", info.ContentType)
h.Set("Last-Modified", info.Created.Format(http.TimeFormat))
h.Set("Content-Length", strconv.FormatInt(info.Size, 10))
for key, val := range info.Headers {
h.Set("X-"+key, val)
}
}
func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
inf *layer.ObjectInfo
params *layer.RangeParams
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 {
writeError(w, r, h.log, "could not find object", rid, bkt, obj, err)
return
}
if params, err = fetchRangeHeader(r.Header, uint64(inf.Size)); err != nil {
writeError(w, r, h.log, "could not parse range header", rid, bkt, obj, err)
return
}
if inf.ContentType, err = h.contentTypeFetcherWithRange(r.Context(), w, inf, params); err != nil {
writeError(w, r, h.log, "could not get object", rid, bkt, obj, err)
return
}
writeHeaders(w.Header(), inf)
if params != nil {
writeRangeHeaders(w, params, inf.Size)
}
}
func writeRangeHeaders(w http.ResponseWriter, params *layer.RangeParams, size int64) {
w.Header().Set("Accept-Ranges", "bytes")
w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", params.Start, params.End, size))
w.WriteHeader(http.StatusPartialContent)
}
func writeError(w http.ResponseWriter, r *http.Request, log *zap.Logger, msg, rid, bkt, obj string, err error) {
log.Error(msg,
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)
}