fix CORS in frontend service (#4948)

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

services/frontend/pkg/config/defaults/defaultconfig.go

@@ -25,6 +25,49 @@ func DefaultConfig() *config.Config {
 			Namespace: "com.owncloud.web",
 			Protocol:  "tcp",
 			Prefix:    "",
+			CORS: config.CORS{
+				AllowedOrigins: []string{"*"},
+				AllowedMethods: []string{
+					"OPTIONS",
+					"HEAD",
+					"GET",
+					"PUT",
+					"POST",
+					"DELETE",
+					"MKCOL",
+					"PROPFIND",
+					"PROPPATCH",
+					"MOVE",
+					"COPY",
+					"REPORT",
+					"SEARCH",
+				},
+				AllowedHeaders: []string{
+					"Origin",
+					"Accept",
+					"Content-Type",
+					"Depth",
+					"Authorization",
+					"Ocs-Apirequest",
+					"If-None-Match",
+					"If-Match",
+					"Destination",
+					"Overwrite",
+					"X-Request-Id",
+					"X-Requested-With",
+					"Tus-Resumable",
+					"Tus-Checksum-Algorithm",
+					"Upload-Concat",
+					"Upload-Length",
+					"Upload-Metadata",
+					"Upload-Defer-Length",
+					"Upload-Expires",
+					"Upload-Checksum",
+					"Upload-Offset",
+					"X-HTTP-Method-Override",
+				},
+				AllowCredentials: true,
+			},
 		},
 		Service: config.Service{
 			Name: "frontend",