feat: add folder id to dav mkcol responses

Adds the `OC-FileId` header to dav `mkcol` responses, containing the id of the newly created folder.

This is necessary for clients that work with ids and want to fetch a folder immediately after creating.

changelog/unreleased/add-folder-id-to-mkcol-response.md

@@ -0,0 +1,6 @@
+Enhancement: Folder id in mkcol dav responses
+
+`mkcol` dav responses now have the `OC-FileId` header containing the id of the created folder.
+
+https://github.com/cs3org/reva/pull/4767
+https://github.com/owncloud/ocis/issues/9618

internal/http/services/owncloud/ocdav/mkcol.go

@@ -27,10 +27,12 @@ import (
 
 	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
 	provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+	"github.com/cs3org/reva/v2/internal/http/services/owncloud/ocdav/net"
 	"github.com/cs3org/reva/v2/internal/http/services/owncloud/ocdav/spacelookup"
 	"github.com/cs3org/reva/v2/pkg/appctx"
 	"github.com/cs3org/reva/v2/pkg/errtypes"
 	rstatus "github.com/cs3org/reva/v2/pkg/rgrpc/status"
+	"github.com/cs3org/reva/v2/pkg/storagespace"
 	"github.com/cs3org/reva/v2/pkg/utils"
 	"github.com/rs/zerolog"
 )
@@ -123,6 +125,14 @@ func (s *svc) handleMkcol(ctx context.Context, w http.ResponseWriter, r *http.Re
 	case err != nil:
 		return http.StatusInternalServerError, err
 	case res.Status.Code == rpc.Code_CODE_OK:
+		sReq := &provider.StatRequest{
+			Ref: childRef,
+		}
+		sRes, err := client.Stat(ctx, sReq)
+		if err != nil {
+			return http.StatusInternalServerError, err
+		}
+		w.Header().Set(net.HeaderOCFileID, storagespace.FormatResourceID(sRes.GetInfo().GetId()))
 		w.WriteHeader(http.StatusCreated)
 		return 0, nil
 	case res.Status.Code == rpc.Code_CODE_NOT_FOUND: