frostfs-http-gw/downloader/head.go
Leonard Lyubich 271451dc32 [#128] downloader: Simplify detecting the Content-Type from payload
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2022-03-04 13:43:34 +03:00

96 lines
2.8 KiB
Go

package downloader
import (
"io"
"net/http"
"strconv"
"time"
"github.com/nspcc-dev/neofs-http-gw/response"
"github.com/nspcc-dev/neofs-http-gw/tokens"
"github.com/nspcc-dev/neofs-http-gw/utils"
"github.com/nspcc-dev/neofs-sdk-go/object"
"github.com/nspcc-dev/neofs-sdk-go/object/address"
"github.com/nspcc-dev/neofs-sdk-go/pool"
"github.com/valyala/fasthttp"
"go.uber.org/zap"
)
// max bytes needed to detect content type according to http.DetectContentType docs.
const sizeToDetectType = 512
const (
hdrObjectID = "X-Object-Id"
hdrOwnerID = "X-Owner-Id"
hdrContainerID = "X-Container-Id"
)
func (r request) headObject(clnt pool.Object, objectAddress *address.Address) {
var start = time.Now()
if err := tokens.StoreBearerToken(r.RequestCtx); err != nil {
r.log.Error("could not fetch and store bearer token", zap.Error(err))
response.Error(r.RequestCtx, "could not fetch and store bearer token", fasthttp.StatusBadRequest)
return
}
bearerOpt := bearerOpts(r.RequestCtx)
obj, err := clnt.HeadObject(r.RequestCtx, *objectAddress, bearerOpt)
if err != nil {
r.handleNeoFSErr(err, start)
return
}
r.Response.Header.Set(fasthttp.HeaderContentLength, strconv.FormatUint(obj.PayloadSize(), 10))
var contentType string
for _, attr := range obj.Attributes() {
key := attr.Key()
val := attr.Value()
if !isValidToken(key) || !isValidValue(val) {
continue
}
r.Response.Header.Set(utils.UserAttributeHeaderPrefix+key, val)
switch key {
case object.AttributeTimestamp:
value, err := strconv.ParseInt(val, 10, 64)
if err != nil {
r.log.Info("couldn't parse creation date",
zap.String("key", key),
zap.String("val", val),
zap.Error(err))
continue
}
r.Response.Header.Set(fasthttp.HeaderLastModified, time.Unix(value, 0).UTC().Format(http.TimeFormat))
case object.AttributeContentType:
contentType = val
}
}
idsToResponse(&r.Response, obj)
if len(contentType) == 0 {
contentType, _, err = readContentType(obj.PayloadSize(), func(sz uint64) (io.Reader, error) {
return clnt.ObjectRange(r.RequestCtx, *objectAddress, 0, sz, bearerOpt)
})
if err != nil && err != io.EOF {
r.handleNeoFSErr(err, start)
return
}
}
r.SetContentType(contentType)
}
func idsToResponse(resp *fasthttp.Response, obj *object.Object) {
resp.Header.Set(hdrObjectID, obj.ID().String())
resp.Header.Set(hdrOwnerID, obj.OwnerID().String())
resp.Header.Set(hdrContainerID, obj.ContainerID().String())
}
// HeadByAddress handles head requests using simple cid/oid format.
func (d *Downloader) HeadByAddress(c *fasthttp.RequestCtx) {
d.byAddress(c, request.headObject)
}
// HeadByAttribute handles attribute-based head requests.
func (d *Downloader) HeadByAttribute(c *fasthttp.RequestCtx) {
d.byAttribute(c, request.headObject)
}