fix app provider for editor public links

changelog/unreleased/fix-public-link-wopi.md

@@ -0,0 +1,8 @@
+Bugfix: Fix app provider for editor public links
+
+Fixed opening the app provider in public links with the editor permission.
+The app provider failed to open the file in read write mode.
+
+
+https://github.com/owncloud/ocis/issues/2803
+https://github.com/cs3org/reva/pull/2310

internal/grpc/services/publicstorageprovider/publicstorageprovider.go

@@ -108,7 +108,25 @@ func New(m map[string]interface{}, ss *grpc.Server) (rgrpc.Service, error) {
 }
 
 func (s *service) SetArbitraryMetadata(ctx context.Context, req *provider.SetArbitraryMetadataRequest) (*provider.SetArbitraryMetadataResponse, error) {
-	return nil, gstatus.Errorf(codes.Unimplemented, "method not implemented")
+	tkn, relativePath, err := s.unwrap(ctx, req.Ref)
+	if err != nil {
+		return nil, err
+	}
+
+	_, shareInfo, st, err := s.resolveToken(ctx, tkn)
+	switch {
+	case err != nil:
+		return nil, err
+	case st != nil:
+		return &provider.SetArbitraryMetadataResponse{
+			Status: st,
+		}, nil
+	}
+
+	p := path.Join("/", shareInfo.Path, relativePath)
+	ref := &provider.Reference{Path: p}
+
+	return s.gateway.SetArbitraryMetadata(ctx, &provider.SetArbitraryMetadataRequest{Opaque: req.Opaque, Ref: ref, ArbitraryMetadata: req.ArbitraryMetadata})
 }
 
 func (s *service) UnsetArbitraryMetadata(ctx context.Context, req *provider.UnsetArbitraryMetadataRequest) (*provider.UnsetArbitraryMetadataResponse, error) {