judge: support HYDRO_TESTCASE

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.4.19",
+    "version": "3.4.20",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/model/discussion.ts

@@ -256,8 +256,9 @@ export function flushNodes(domainId: string) {
 
 export async function getVnode(domainId: string, type: number, id: string, uid?: number) {
     if (type === document.TYPE_PROBLEM) {
-        const pdoc = await problem.get(domainId, Number.isSafeInteger(+id) ? +id : id);
+        let pdoc = await problem.get(domainId, Number.isSafeInteger(+id) ? +id : id, problem.PROJECTION_LIST);
         if (!pdoc) throw new DiscussionNodeNotFoundError(id);
+        if (pdoc.hidden) pdoc = problem.default;
         return { ...pdoc, type, id: pdoc.docId };
     }
     if ([document.TYPE_CONTEST, document.TYPE_TRAINING, document.TYPE_HOMEWORK].includes(type as any)) {