Fix Accept-Patch in OPTIONS

Use resource allowed patches in OPTIONS.

packages/core/src/backend/servers/http/core.ts

@@ -551,15 +551,10 @@ export const createServer = (backendState: BackendState, serverParams = {} as Cr
 						if (resourceReq.method === 'POST') {
 							headers['Accept-Post'] = Array.from(resourceReq.backend.app.mediaTypes.keys()).join(',');
 						} else if (resourceReq.method === 'PATCH') {
-							headers['Accept-Patch'] = Array.from(resourceReq.backend.app.mediaTypes.keys()).map((m) => {
-								const [mimeType, mimeSubtype] = m.split('/');
-
-								// TODO accept only patch document type from request
-								// TODO implement Vary header (which headers influenced the request)
-								// TODO implement OPTIONS method for determining the accepted media types and languages
-								// TODO configure strict and lax accept behavior for content negotiation
-								return `${mimeType}/merge-patch+${mimeSubtype}`;
-							}).join(',');
+							headers['Accept-Patch'] = Array.from(Object.entries(PATCH_CONTENT_MAP_TYPE))
+								.filter(([, value]) => Object.keys(resourceReq.resource.state.canPatch).includes(value))
+								.map(([contentType]) => contentType)
+								.join(',');
 						}
 
 						handleError(new ErrorPlainResponse('unableToSerializeResponse', {