diff --git a/package.json b/package.json
index c2b4972ba..734833439 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
         "@types/autocannon": "^7.6.1",
         "@types/cross-spawn": "^6.0.2",
         "@types/mocha": "^9.1.1",
-        "@types/node": "^18.0.0",
+        "@types/node": "^18.0.3",
         "@types/semver": "^7.3.10",
         "@types/supertest": "^2.0.12",
         "@typescript-eslint/eslint-plugin": "^5.29.0",
@@ -57,11 +57,11 @@
         "latest-version": "6.0.0",
         "mocha": "^10.0.0",
         "mongodb": "^3.7.3",
-        "mongodb-memory-server": "^8.7.1",
+        "mongodb-memory-server": "^8.7.2",
         "ora": "5.4.1",
         "semver": "^7.3.7",
-        "supertest": "^6.2.3",
-        "typedoc": "^0.22.18",
+        "supertest": "^6.2.4",
+        "typedoc": "^0.23.7",
         "typescript": "4.6.4"
     },
     "resolutions": {
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 59c3b1273..2f4272825 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.14.10",
+    "version": "3.14.11",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
@@ -12,7 +12,7 @@
     },
     "preferUnplugged": true,
     "dependencies": {
-        "@graphql-tools/schema": "^8.4.0",
+        "@graphql-tools/schema": "^8.5.0",
         "@hydrooj/utils": "workspace:*",
         "adm-zip": "0.5.5",
         "ajv": "^8.11.0",
@@ -35,13 +35,13 @@
         "koa-router": "^10.1.1",
         "koa-static-cache": "^5.1.4",
         "lodash": "^4.17.21",
-        "lru-cache": "7.9.0",
+        "lru-cache": "7.12.0",
         "mime-types": "^2.1.35",
         "minio": "7.0.25",
         "moment-timezone": "^0.5.34",
         "mongodb": "^3.7.3",
         "nanoid": "^3.3.4",
-        "nodemailer": "^6.7.5",
+        "nodemailer": "^6.7.7",
         "notp": "^2.0.3",
         "p-queue": "^7.2.0",
         "path-to-regexp": "^6.2.1",
@@ -62,7 +62,7 @@
         "@types/koa-router": "^7.4.4",
         "@types/koa-static-cache": "^5.1.1",
         "@types/lodash": "^4.14.182",
-        "@types/lru-cache": "^7.6.1",
+        "@types/lru-cache": "^7.10.10",
         "@types/mime-types": "^2.1.1",
         "@types/minio": "^7.0.13",
         "@types/mongodb": "^3.6.20",
@@ -72,7 +72,7 @@
         "@types/serialize-javascript": "^5.0.2",
         "@types/source-map-support": "^0.5.4",
         "@types/superagent": "^4.1.15",
-        "moment": "^2.29.3",
+        "moment": "^2.29.4",
         "pm2": "^5.2.0"
     },
     "peerDependencies": {
diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index d7be8d284..8e78ac35e 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -71,7 +71,7 @@ export class ContestListHandler extends Handler {
     async get(domainId: string, rule = '', page = 1) {
         const cursor = contest.getMulti(domainId, rule ? { rule } : { rule: { $ne: 'homework' } });
         const qs = rule ? `rule=${rule}` : '';
-        const [tdocs, tpcount] = await paginate(cursor, page, system.get('pagination.contest'));
+        const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
         const tids = [];
         for (const tdoc of tdocs) tids.push(tdoc.docId);
         const tsdict = await contest.getListStatus(domainId, this.user._id, tids);
@@ -82,47 +82,58 @@ export class ContestListHandler extends Handler {
     }
 }
 
-export class ContestDetailHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    @param('page', Types.PositiveInt, true)
-    async prepare(domainId: string, tid: ObjectID) {
-        const tdoc = await contest.get(domainId, tid);
-        if (tdoc.assign?.length && !this.user.own(tdoc)) {
-            const groups = await user.listGroup(domainId, this.user._id);
-            if (!Set.intersection(tdoc.assign, groups.map((i) => i.name)).size) {
-                throw new ForbiddenError('You are not assigned.');
-            }
-        }
-    }
+export class ContestDetailBaseHandler extends Handler {
+    tdoc?: Tdoc<30>;
+    tsdoc?: any;
 
-    @param('tid', Types.ObjectID)
-    @param('page', Types.PositiveInt, true)
-    async get(domainId: string, tid: ObjectID, page = 1) {
-        const [tdoc, tsdoc] = await Promise.all([
+    @param('tid', Types.ObjectID, true)
+    async __prepare(domainId: string, tid: ObjectID) {
+        if (!tid) return; // ProblemDetailHandler also extends from ContestDetailBaseHandler
+        [this.tdoc, this.tsdoc] = await Promise.all([
             contest.get(domainId, tid),
             contest.getStatus(domainId, tid, this.user._id),
         ]);
+        if (this.tdoc.assign?.length && !this.user.own(this.tdoc)) {
+            const groups = await user.listGroup(domainId, this.user._id);
+            if (!Set.intersection(this.tdoc.assign, groups.map((i) => i.name)).size) {
+                throw new ForbiddenError('You are not assigned.');
+            }
+        }
+        if (this.tdoc.duration && this.tsdoc?.attend) {
+            this.tsdoc.endAt = moment(this.tsdoc.startAt).add(this.tdoc.duration, 'hours').toDate();
+        }
+    }
+}
+
+export class ContestDetailHandler extends ContestDetailBaseHandler {
+    @param('tid', Types.ObjectID)
+    async prepare(domainId: string, tid: ObjectID) {
+        if (contest.RULES[this.tdoc.rule].hidden) throw new ContestNotFoundError(domainId, tid);
+    }
+
+    @param('tid', Types.ObjectID)
+    async get(domainId: string, tid: ObjectID) {
         this.response.template = 'contest_detail.html';
-        const udict = await user.getList(domainId, [tdoc.owner]);
+        const udict = await user.getList(domainId, [this.tdoc.owner]);
         this.response.body = {
-            tdoc, tsdoc, udict, page,
+            tdoc: this.tdoc, tsdoc: this.tsdoc, udict,
         };
-        if (contest.isNotStarted(tdoc)) return;
+        if (contest.isNotStarted(this.tdoc)) return;
         if (!this.request.json) {
             this.response.body.tdoc.content = this.response.body.tdoc.content
-                .replace(/\(file:\/\//g, `(./${tdoc.docId}/file/`)
-                .replace(/="file:\/\//g, `="./${tdoc.docId}/file/`);
+                .replace(/\(file:\/\//g, `(./${this.tdoc.docId}/file/`)
+                .replace(/="file:\/\//g, `="./${this.tdoc.docId}/file/`);
         }
-        const pdict = await problem.getList(domainId, tdoc.pids, true, undefined, undefined, problem.PROJECTION_CONTEST_LIST);
+        const pdict = await problem.getList(domainId, this.tdoc.pids, true, undefined, undefined, problem.PROJECTION_CONTEST_LIST);
         const psdict = {};
         let rdict = {};
-        if (tsdoc) {
-            if (tsdoc.attend && !tsdoc.startAt && contest.isOngoing(tdoc)) {
+        if (this.tsdoc) {
+            if (this.tsdoc.attend && !this.tsdoc.startAt && contest.isOngoing(this.tdoc)) {
                 await contest.setStatus(domainId, tid, this.user._id, { startAt: new Date() });
-                tsdoc.startAt = new Date();
+                this.tsdoc.startAt = new Date();
             }
-            for (const pdetail of tsdoc.journal || []) psdict[pdetail.pid] = pdetail;
-            if (contest.canShowSelfRecord.call(this, tdoc)) {
+            for (const pdetail of this.tsdoc.journal || []) psdict[pdetail.pid] = pdetail;
+            if (contest.canShowSelfRecord.call(this, this.tdoc)) {
                 rdict = await record.getList(domainId, Object.values(psdict).map((i: any) => i.rid));
             } else {
                 for (const i in psdict) rdict[psdict[i].rid] = { _id: psdict[i].rid };
@@ -134,17 +145,15 @@ export class ContestDetailHandler extends Handler {
     @param('tid', Types.ObjectID)
     @param('code', Types.String, true)
     async postAttend(domainId: string, tid: ObjectID, code = '') {
-        const tdoc = await contest.get(domainId, tid);
-        if (contest.isDone(tdoc)) throw new ContestNotLiveError(tid);
-        if (tdoc._code && code !== tdoc._code) throw new InvalidTokenError(code);
+        if (contest.isDone(this.tdoc)) throw new ContestNotLiveError(tid);
+        if (this.tdoc._code && code !== this.tdoc._code) throw new InvalidTokenError(code);
         await contest.attend(domainId, tid, this.user._id);
         this.back();
     }
 
     @param('tid', Types.ObjectID)
     async postDelete(domainId: string, tid: ObjectID) {
-        const tdoc = await contest.get(domainId, tid);
-        if (!this.user.own(tdoc)) this.checkPerm(PERM.PERM_EDIT_CONTEST);
+        if (!this.user.own(this.tdoc)) this.checkPerm(PERM.PERM_EDIT_CONTEST);
         await contest.del(domainId, tid);
         await record.updateMulti(domainId, { domainId, contest: tid }, undefined, undefined, { contest: '' });
         await TaskModel.deleteMany({
@@ -154,26 +163,18 @@ export class ContestDetailHandler extends Handler {
     }
 }
 
-export class ContestBroadcastHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    async get(domainId: string, tid: ObjectID) {
-        const tdoc = await contest.get(domainId, tid);
-        if (!this.user.own(tdoc)) throw new PermissionError('Boardcast Message');
-        const path = [
-            ['Hydro', 'homepage'],
-            ['contest_main', 'contest_main'],
-            [tdoc.title, 'contest_detail', { tid }, true],
-            ['contest_broadcast'],
-        ];
+export class ContestBroadcastHandler extends ContestDetailBaseHandler {
+    async prepare() {
+        if (!this.user.own(this.tdoc)) throw new PermissionError('Boardcast Message');
+    }
+
+    async get() {
         this.response.template = 'contest_broadcast.html';
-        this.response.body = path;
     }
 
     @param('tid', Types.ObjectID)
     @param('content', Types.Content)
     async post(domainId: string, tid: ObjectID, content: string) {
-        const tdoc = await contest.get(domainId, tid);
-        if (!this.user.own(tdoc)) throw new PermissionError('Broadcast Message');
         const tsdocs = await contest.getMultiStatus(domainId, { docId: tid }).toArray();
         const uids: number[] = Array.from(new Set(tsdocs.map((tsdoc) => tsdoc.uid)));
         await Promise.all(
@@ -183,49 +184,44 @@ export class ContestBroadcastHandler extends Handler {
     }
 }
 
-export class ContestScoreboardHandler extends Handler {
+export class ContestScoreboardHandler extends ContestDetailBaseHandler {
     @param('tid', Types.ObjectID)
     @param('page', Types.PositiveInt, true)
+    @param('ext', Types.Range(['csv', 'html']), true)
     @param('ignoreLock', Types.Boolean, true)
-    async get(domainId: string, tid: ObjectID, page = 1, ignoreLock = false) {
-        const tdoc = await contest.get(domainId, tid);
-        if (ignoreLock && !this.user.own(tdoc)) {
-            this.checkPerm(PERM.PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD);
+    async get(domainId: string, tid: ObjectID, page = 1, ext = '', ignoreLock = false) {
+        if (ignoreLock && !this.user.own(this.tdoc)) {
+            this.checkPerm(this.tdoc.rule === 'homework'
+                ? PERM.PERM_VIEW_HOMEWORK_HIDDEN_SCOREBOARD
+                : PERM.PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD);
         }
-        const pdict = await problem.getList(domainId, tdoc.pids, true, undefined, false, [
+        if (ext) {
+            await this.exportScoreboard(domainId, tid, ext, ignoreLock);
+            return;
+        }
+        const pdict = await problem.getList(domainId, this.tdoc.pids, true, undefined, false, [
             // Problem statistics display is allowed as we can view submission info in scoreboard.
             ...problem.PROJECTION_CONTEST_LIST, 'nSubmit', 'nAccept',
         ]);
         const [, rows, udict, , nPages] = await contest.getScoreboard.call(this, domainId, tid, false, page, ignoreLock);
-        const path = [
-            ['Hydro', 'homepage'],
-            ['contest_main', 'contest_main'],
-            [tdoc.title, 'contest_detail', { tid }, true],
-            ['contest_scoreboard', null],
-        ];
         this.response.template = 'contest_scoreboard.html';
+        // eslint-disable-next-line @typescript-eslint/naming-convention
+        const page_name = this.tdoc.rule === 'homework'
+            ? 'homework_scoreboard'
+            : 'contest_scoreboard';
         this.response.body = {
-            tdoc, rows, path, udict, nPages, page, pdict,
+            tdoc: this.tdoc, rows, udict, nPages, page, pdict, page_name,
         };
     }
-}
 
-export class ContestScoreboardDownloadHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    @param('ext', Types.Range(['csv', 'html']))
-    @param('ignoreLock', Types.Boolean, true)
-    async get(domainId: string, tid: ObjectID, ext: string, ignoreLock = false) {
+    async exportScoreboard(domainId: string, tid: ObjectID, ext: string, ignoreLock: boolean) {
         await this.limitRate('scoreboard_download', 120, 3);
         const getContent = {
             csv: async (rows) => `\uFEFF${rows.map((c) => (c.map((i) => i.value?.toString().replace(/\n/g, ' ')).join(','))).join('\n')}`,
             html: (rows, tdoc) => this.renderHTML('contest_scoreboard_download_html.html', { rows, tdoc }),
         };
-        const tdoc = await contest.get(domainId, tid);
-        if (ignoreLock && !this.user.own(tdoc)) {
-            this.checkPerm(PERM.PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD);
-        }
         const [, rows] = await contest.getScoreboard.call(this, domainId, tid, true, 0, ignoreLock);
-        this.binary(await getContent[ext](rows, tdoc), `${tdoc.title}.${ext}`);
+        this.binary(await getContent[ext](rows, this.tdoc), `${this.tdoc.title}.${ext}`);
     }
 }
 
@@ -237,6 +233,7 @@ export class ContestEditHandler extends Handler {
         if (tid) {
             this.tdoc = await contest.get(domainId, tid);
             if (!this.tdoc) throw new ContestNotFoundError(domainId, tid);
+            if (contest.RULES[this.tdoc.rule].hidden) throw new ContestNotFoundError(domainId, tid);
             if (!this.user.own(this.tdoc)) this.checkPerm(PERM.PERM_EDIT_CONTEST);
             else this.checkPerm(PERM.PERM_EDIT_CONTEST_SELF);
         } else this.checkPerm(PERM.PERM_CREATE_CONTEST);
@@ -372,17 +369,15 @@ export class ContestCodeHandler extends Handler {
     }
 }
 
-export class ContestFilesHandler extends ContestDetailHandler {
+export class ContestFilesHandler extends ContestDetailBaseHandler {
     @param('tid', Types.ObjectID)
     @param('pjax', Types.Boolean)
-    // @ts-ignore
     async get(domainId: string, tid: ObjectID, pjax = false) {
-        const tdoc = await contest.get(domainId, tid);
-        if (!this.user.own(tdoc)) this.checkPerm(PERM.PERM_EDIT_CONTEST);
+        if (!this.user.own(this.tdoc)) this.checkPerm(PERM.PERM_EDIT_CONTEST);
         const body = {
-            tdoc,
-            owner_udoc: await user.getById(domainId, tdoc.owner),
-            files: sortFiles(tdoc.files || []),
+            tdoc: this.tdoc,
+            owner_udoc: await user.getById(domainId, this.tdoc.owner),
+            files: sortFiles(this.tdoc.files || []),
             urlForFile: (filename: string) => this.url('contest_file_download', { tid, filename }),
         };
         if (pjax) {
@@ -407,14 +402,13 @@ export class ContestFilesHandler extends ContestDetailHandler {
     @param('tid', Types.ObjectID)
     @post('filename', Types.Name, true)
     async postUploadFile(domainId: string, tid: ObjectID, filename: string) {
-        const tdoc = await contest.get(domainId, tid);
-        if ((tdoc.files?.length || 0) >= system.get('limit.contest_files')) {
+        if ((this.tdoc.files?.length || 0) >= system.get('limit.contest_files')) {
             throw new ForbiddenError('File limit exceeded.');
         }
         const file = this.request.files?.file;
         if (!file) throw new ValidationError('file');
         const f = statSync(file.filepath);
-        const size = Math.sum((tdoc.files || []).map((i) => i.size)) + f.size;
+        const size = Math.sum((this.tdoc.files || []).map((i) => i.size)) + f.size;
         if (size >= system.get('limit.contest_files_size')) {
             throw new ForbiddenError('File size limit exceeded.');
         }
@@ -424,27 +418,25 @@ export class ContestFilesHandler extends ContestDetailHandler {
         const meta = await storage.getMeta(`contest/${domainId}/${tid}/${filename}`);
         const payload = { name: filename, ...pick(meta, ['size', 'lastModified', 'etag']) };
         if (!meta) throw new Error('Upload failed');
-        await contest.edit(domainId, tid, { files: [...(tdoc.files || []), payload] });
+        await contest.edit(domainId, tid, { files: [...(this.tdoc.files || []), payload] });
         this.back();
     }
 
     @param('tid', Types.ObjectID)
     @post('files', Types.Array)
     async postDeleteFiles(domainId: string, tid: ObjectID, files: string[]) {
-        const tdoc = await contest.get(domainId, tid);
         await Promise.all([
             storage.del(files.map((t) => `contest/${domainId}/${tid}/${t}`), this.user._id),
-            contest.edit(domainId, tid, { files: tdoc.files.filter((i) => !files.includes(i.name)) }),
+            contest.edit(domainId, tid, { files: this.tdoc.files.filter((i) => !files.includes(i.name)) }),
         ]);
         this.back();
     }
 }
 
-export class ContestFileDownloadHandler extends ContestDetailHandler {
+export class ContestFileDownloadHandler extends ContestDetailBaseHandler {
     @param('tid', Types.ObjectID)
     @param('filename', Types.Name)
     @param('noDisposition', Types.Boolean)
-    // @ts-ignore
     async get(domainId: string, tid: ObjectID, filename: string, noDisposition = false) {
         this.response.addHeader('Cache-Control', 'public');
         const target = `contest/${domainId}/${tid}/${filename}`;
@@ -466,7 +458,7 @@ export async function apply() {
     Route('contest_broadcast', '/contest/:tid/broadcast', ContestBroadcastHandler);
     Route('contest_edit', '/contest/:tid/edit', ContestEditHandler, PERM.PERM_VIEW_CONTEST);
     Route('contest_scoreboard', '/contest/:tid/scoreboard', ContestScoreboardHandler, PERM.PERM_VIEW_CONTEST);
-    Route('contest_scoreboard_download', '/contest/:tid/export/:ext', ContestScoreboardDownloadHandler, PERM.PERM_VIEW_CONTEST);
+    Route('contest_scoreboard_download', '/contest/:tid/export/:ext', ContestScoreboardHandler, PERM.PERM_VIEW_CONTEST);
     Route('contest_code', '/contest/:tid/code', ContestCodeHandler, PERM.PERM_VIEW_CONTEST);
     Route('contest_files', '/contest/:tid/file', ContestFilesHandler, PERM.PERM_VIEW_CONTEST);
     Route('contest_file_download', '/contest/:tid/file/:filename', ContestFileDownloadHandler, PERM.PERM_VIEW_CONTEST);
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index 08e5349b7..3e5f12a93 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -1,4 +1,3 @@
-import AdmZip from 'adm-zip';
 import yaml from 'js-yaml';
 import moment from 'moment-timezone';
 import { ObjectID } from 'mongodb';
@@ -9,7 +8,7 @@ import {
 } from '../error';
 import { PenaltyRules } from '../interface';
 import paginate from '../lib/paginate';
-import { PERM, PRIV } from '../model/builtin';
+import { PERM } from '../model/builtin';
 import * as contest from '../model/contest';
 import * as discussion from '../model/discussion';
 import problem from '../model/problem';
@@ -19,6 +18,7 @@ import user from '../model/user';
 import {
     Handler, param, Route, Types,
 } from '../service/server';
+import { ContestCodeHandler, ContestScoreboardHandler } from './contest';
 
 const validatePenaltyRules = (input: string) => yaml.load(input);
 const convertPenaltyRules = validatePenaltyRules;
@@ -207,80 +207,16 @@ class HomeworkEditHandler extends Handler {
     }
 }
 
-class HomeworkScoreboardHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    @param('page', Types.PositiveInt, true)
-    async get(domainId: string, tid: ObjectID, page = 1) {
-        const [tdoc, rows, udict, , nPages] = await contest.getScoreboard.call(
-            this, domainId, tid, false, page,
-        );
-        const pdict = await problem.getList(domainId, tdoc.pids, true, undefined, false, [
-            // Problem statistics display is allowed as we can view submission info in scoreboard.
-            ...problem.PROJECTION_CONTEST_LIST, 'nSubmit', 'nAccept',
-        ]);
-        const path = [
-            ['Hydro', 'homepage'],
-            ['homework_main', 'homework_main'],
-            [tdoc.title, 'homework_detail', { tid }, true],
-            ['homework_scoreboard', null],
-        ];
-        this.response.template = 'contest_scoreboard.html';
-        this.response.body = {
-            tdoc, rows, path, udict, pdict, page, nPages, page_name: 'homework_scoreboard',
-        };
-    }
-}
-
-class HomeworkScoreboardDownloadHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    @param('ext', Types.Name)
-    async get(domainId: string, tid: ObjectID, ext: string) {
-        await this.limitRate('scoreboard_download', 120, 3);
-        const getContent = {
-            csv: (rows) => `\uFEFF${rows.map((c) => (c.map((i) => i.value).join(','))).join('\n')}`,
-            html: (rows) => this.renderHTML('contest_scoreboard_download_html.html', { rows }),
-        };
-        if (!getContent[ext]) throw new ValidationError('ext', null, 'Unknown file extension');
-        const [tdoc, rows] = await contest.getScoreboard.call(this, domainId, tid, true, 0);
-        this.binary(await getContent[ext](rows), `${tdoc.title}.${ext}`);
-    }
-}
-
-class HomeworkCodeHandler extends Handler {
-    @param('tid', Types.ObjectID)
-    async get(domainId: string, tid: ObjectID) {
-        await this.limitRate('contest_code', 3600, 60);
-        const [tdoc, tsdocs] = await contest.getAndListStatus(domainId, tid);
-        if (!this.user.own(tdoc) && !this.user.hasPriv(PRIV.PRIV_READ_RECORD_CODE)) {
-            this.checkPerm(PERM.PERM_READ_RECORD_CODE);
-        }
-        const rnames = {};
-        for (const tsdoc of tsdocs) {
-            for (const pid in tsdoc.detail || {}) {
-                rnames[tsdoc.detail[pid].rid] = `U${tsdoc.uid}_P${pid}_R${tsdoc.detail[pid].rid}`;
-            }
-        }
-        const zip = new AdmZip();
-        const rdocs = await record.getMulti(domainId, {
-            _id: { $in: Array.from(Object.keys(rnames)).map((id) => new ObjectID(id)) },
-        }).toArray();
-        for (const rdoc of rdocs) {
-            zip.addFile(`${rnames[rdoc._id.toHexString()]}.${rdoc.lang}`, Buffer.from(rdoc.code));
-        }
-        this.binary(zip.toBuffer(), `${tdoc.title}.zip`);
-    }
-}
-
 export async function apply() {
     Route('homework_main', '/homework', HomeworkMainHandler, PERM.PERM_VIEW_HOMEWORK);
     Route('homework_create', '/homework/create', HomeworkEditHandler);
     Route('homework_detail', '/homework/:tid', HomeworkDetailHandler, PERM.PERM_VIEW_HOMEWORK);
-    Route('homework_scoreboard', '/homework/:tid/scoreboard', HomeworkScoreboardHandler, PERM.PERM_VIEW_HOMEWORK_SCOREBOARD);
+    Route('homework_scoreboard', '/homework/:tid/scoreboard', ContestScoreboardHandler, PERM.PERM_VIEW_HOMEWORK_SCOREBOARD);
     Route(
         'homework_scoreboard_download', '/homework/:tid/scoreboard/download/:ext',
-        HomeworkScoreboardDownloadHandler, PERM.PERM_VIEW_HOMEWORK_SCOREBOARD,
+        ContestScoreboardHandler, PERM.PERM_VIEW_HOMEWORK_SCOREBOARD,
     );
-    Route('homework_code', '/homework/:tid/code', HomeworkCodeHandler, PERM.PERM_VIEW_HOMEWORK);
+    Route('homework_code', '/homework/:tid/code', ContestCodeHandler, PERM.PERM_VIEW_HOMEWORK);
     Route('homework_edit', '/homework/:tid/edit', HomeworkEditHandler);
 }
 
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 2b6d18b17..e800dfc95 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -13,8 +13,7 @@ import {
     ValidationError,
 } from '../error';
 import {
-    ProblemDoc, ProblemStatusDoc, Tdoc,
-    User,
+    ProblemDoc, ProblemStatusDoc, User,
 } from '../interface';
 import paginate from '../lib/paginate';
 import { isPid, parsePid as convertPid } from '../lib/validator';
@@ -35,6 +34,7 @@ import {
     Handler, param, post, query, Route, route, Types,
 } from '../service/server';
 import { registerResolver, registerValue } from './api';
+import { ContestDetailBaseHandler } from './contest';
 
 export const parseCategory = (value: string) => value.replace(/，/g, ',').split(',').map((e) => e.trim());
 export const parsePid = (value: string) => (isSafeInteger(value) ? +value : value);
@@ -112,30 +112,7 @@ function buildQuery(udoc: User) {
     return q;
 }
 
-export class ProblemHandler extends Handler {
-    async cleanup() {
-        if (this.response.template === 'problem_main.html' && this.request.json) {
-            const {
-                page, pcount, pcountRelation, ppcount, pdocs, psdict, category, qs,
-            } = this.response.body;
-            this.response.body = {
-                title: this.renderTitle(this.translate('problem_main')),
-                fragments: (await Promise.all([
-                    this.renderHTML('partials/problem_list.html', {
-                        page, ppcount, pcount, pdocs, psdict, qs,
-                    }),
-                    this.renderHTML('partials/problem_stat.html', { pcount, pcountRelation }),
-                    this.renderHTML('partials/problem_lucky.html', { qs }),
-                ])).map((i) => ({ html: i })),
-                raw: {
-                    page, pcount, ppcount, pdocs, psdict, category,
-                },
-            };
-        }
-    }
-}
-
-export class ProblemMainHandler extends ProblemHandler {
+export class ProblemMainHandler extends Handler {
     @param('page', Types.PositiveInt, true)
     @param('q', Types.Content, true)
     async get(domainId: string, page = 1, q = '') {
@@ -204,16 +181,32 @@ export class ProblemMainHandler extends ProblemHandler {
                     ).then((res) => Object.assign(psdict, res))),
             );
         }
-        this.response.body = {
-            page,
-            pcount,
-            ppcount,
-            pcountRelation,
-            pdocs,
-            psdict,
-            category: category.join(','),
-            qs: q,
-        };
+        if (this.request.json) {
+            this.response.body = {
+                title: this.renderTitle(this.translate('problem_main')),
+                fragments: (await Promise.all([
+                    this.renderHTML('partials/problem_list.html', {
+                        page, ppcount, pcount, pdocs, psdict, qs: q,
+                    }),
+                    this.renderHTML('partials/problem_stat.html', { pcount, pcountRelation }),
+                    this.renderHTML('partials/problem_lucky.html', { qs: q }),
+                ])).map((i) => ({ html: i })),
+                raw: {
+                    page, pcount, ppcount, pdocs, psdict, category,
+                },
+            };
+        } else {
+            this.response.body = {
+                page,
+                pcount,
+                ppcount,
+                pcountRelation,
+                pdocs,
+                psdict,
+                category: category.join(','),
+                qs: q,
+            };
+        }
     }
 
     @param('pid', Types.UnsignedInt)
@@ -283,7 +276,7 @@ export class ProblemMainHandler extends ProblemHandler {
     }
 }
 
-export class ProblemRandomHandler extends ProblemHandler {
+export class ProblemRandomHandler extends Handler {
     @param('q', Types.Content, true)
     async get(domainId: string, qs = '') {
         const category = flattenDeep(decodeURIComponent(qs).split(' ')
@@ -299,10 +292,8 @@ export class ProblemRandomHandler extends ProblemHandler {
     }
 }
 
-export class ProblemDetailHandler extends ProblemHandler {
+export class ProblemDetailHandler extends ContestDetailBaseHandler {
     pdoc: ProblemDoc;
-    tdoc?: Tdoc<30>;
-    tsdoc?: any;
     udoc: User;
     psdoc: ProblemStatusDoc;
 
@@ -312,9 +303,7 @@ export class ProblemDetailHandler extends ProblemHandler {
         this.pdoc = await problem.get(domainId, pid);
         if (!this.pdoc) throw new ProblemNotFoundError(domainId, pid);
         if (tid) {
-            this.tdoc = await contest.get(domainId, tid);
             if (!this.tdoc?.pids?.includes(this.pdoc.docId)) throw new ContestNotFoundError(domainId, tid);
-            this.tsdoc = await contest.getStatus(domainId, tid, this.user._id);
             if (contest.isNotStarted(this.tdoc)) throw new ContestNotLiveError(tid);
             if (!contest.isDone(this.tdoc, this.tsdoc) && (!this.tsdoc?.attend || !this.tsdoc.startAt)) throw new ContestNotAttendedError(tid);
             this.pdoc.tag.length = 0;
diff --git a/packages/hydrooj/src/model/document.ts b/packages/hydrooj/src/model/document.ts
index 023049e28..e8623e3ef 100644
--- a/packages/hydrooj/src/model/document.ts
+++ b/packages/hydrooj/src/model/document.ts
@@ -26,6 +26,7 @@ export const TYPE_DISCUSSION: 21 = 21;
 export const TYPE_DISCUSSION_REPLY: 22 = 22;
 export const TYPE_CONTEST: 30 = 30;
 export const TYPE_TRAINING: 40 = 40;
+/** @deprecated use `TYPE_CONTEST` with rule `homework` instead. */
 export const TYPE_HOMEWORK: 60 = 60;
 export const TYPE_BLOG: 70 = 70;
 
diff --git a/packages/hydrooj/src/service/server.ts b/packages/hydrooj/src/service/server.ts
index a4a6056a0..654cc0fad 100644
--- a/packages/hydrooj/src/service/server.ts
+++ b/packages/hydrooj/src/service/server.ts
@@ -291,6 +291,7 @@ async function handle(ctx: KoaContext, HandlerClass, checker) {
         await bail(`handler/before-prepare/${HandlerClass.name.replace(/Handler$/, '')}`, h);
         await bail('handler/before-prepare', h);
         h.args.__prepare = Date.now();
+        if (h.__prepare) await h.__prepare(args);
         if (h._prepare) await h._prepare(args);
         if (h.prepare) await h.prepare(args);
         h.args.__prepareDone = Date.now();
diff --git a/packages/ui-default/locales/zh.yaml b/packages/ui-default/locales/zh.yaml
index e6da2b237..671d4372b 100644
--- a/packages/ui-default/locales/zh.yaml
+++ b/packages/ui-default/locales/zh.yaml
@@ -782,6 +782,7 @@ Testdata Config: 测试数据配置
 Testdata: 测试数据
 Text: 文本
 The 'default' role applies to ALL REGISTERED USER.: default 角色作用于<b>所有已注册用户</b>
+The contest is a flexible time contest. You need to complete the contest within a specified time after you attended.: 本场比赛采用灵活时间模式，你需要在参加后的指定时间内完成比赛。
 The homework's deadline is due but in extension. You can still submit for this problem but your score will be penalized.: 作业已超过截止时间，但仍在延期时间内。您递交题目将无法获得全部分数。
 The invitation code to enter to successfully join the domain. You can only use letters and numbers in the code and it should not be longer than 64 characters.: 加入此域的邀请码。您只能使用字母和数字，并且不能长于 64 个字符。
 The invitation code you provided is invalid.: 您提供的邀请码无效。
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index eeef9679f..adaaceedb 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.38.11",
+  "version": "4.38.12",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
@@ -10,7 +10,7 @@
     "lint": "eslint"
   },
   "devDependencies": {
-    "@blueprintjs/core": "^4.5.1",
+    "@blueprintjs/core": "^4.6.0",
     "@fontsource/dm-mono": "^4.5.8",
     "@fontsource/fira-code": "^4.5.10",
     "@fontsource/inconsolata": "^4.5.6",
@@ -27,7 +27,7 @@
     "@types/markdown-it": "^12.2.3",
     "@types/pickadate": "^3.5.32",
     "@types/qrcode": "^1.4.2",
-    "@types/react-dom": "^18.0.5",
+    "@types/react-dom": "^18.0.6",
     "@types/redux-logger": "^3.0.9",
     "ansi_up": "^5.1.0",
     "autoprefixer": "^9.8.8",
@@ -61,7 +61,7 @@
     "jquery.transit": "^0.9.12",
     "matchmedia-polyfill": "^0.3.2",
     "mini-css-extract-plugin": "^1.6.2",
-    "moment": "^2.29.3",
+    "moment": "^2.29.4",
     "monaco-editor": "^0.33.0",
     "monaco-editor-nls": "^2.0.0",
     "monaco-editor-webpack-plugin": "^7.0.1",
diff --git a/packages/ui-default/templates/contest_detail.html b/packages/ui-default/templates/contest_detail.html
index f399c5032..9710c496e 100644
--- a/packages/ui-default/templates/contest_detail.html
+++ b/packages/ui-default/templates/contest_detail.html
@@ -30,6 +30,11 @@
           <p>{{ _('We will check code similarity after this contest.') }}</p>
         </blockquote>
       {% endif %}
+      {% if tdoc.duration %}
+        <blockquote class="note">
+          <p>{{ _('The contest is a flexible time contest. You need to complete the contest within a specified time after you attended.') }}</p>
+        </blockquote>
+      {% endif %}
       </div>
     </div>
   {% if model.contest.isOngoing(tdoc, tsdoc) or model.contest.isDone(tdoc, tsdoc) %}
diff --git a/packages/ui-default/templates/contest_scoreboard.html b/packages/ui-default/templates/contest_scoreboard.html
index f324b9624..1024708fa 100644
--- a/packages/ui-default/templates/contest_scoreboard.html
+++ b/packages/ui-default/templates/contest_scoreboard.html
@@ -1,6 +1,6 @@
 {% import "components/paginator.html" as paginator with context %}
 {% extends "layout/basic.html" %}
-{% set type = 'homework' if tdoc.docType == 60 else 'contest' %}
+{% set type = 'homework' if tdoc.rule == 'homework' else 'contest' %}
 {% block content %}
 <div class="row"><div class="medium-12 columns scoreboard--{{ tdoc.rule }}">
   <div class="section visible">
diff --git a/packages/ui-default/templates/partials/contest_sidebar.html b/packages/ui-default/templates/partials/contest_sidebar.html
index 06417febb..578085577 100644
--- a/packages/ui-default/templates/partials/contest_sidebar.html
+++ b/packages/ui-default/templates/partials/contest_sidebar.html
@@ -109,7 +109,7 @@
       <dt>{{ _('Rule') }}</dt><dd>{{ model.contest.RULES[tdoc.rule].TEXT }}</dd>
       <dt>{{ _('Problem') }}</dt><dd>{{ tdoc.pids.length }}</dd>
       <dt>{{ _('Start at') }}</dt><dd>{{ contest.render_time(tsdoc.startAt or tdoc.beginAt) }}</dd>
-      <dt>{{ _('End at') }}</dt><dd>{{ contest.render_time(tdoc.endAt) }}</dd>
+      <dt>{{ _('End at') }}</dt><dd>{{ contest.render_time(tsdoc.endAt or tdoc.endAt) }}</dd>
       <dt>{{ _('Duration') }}</dt><dd>{{ contest.render_duration(tdoc) }} {{ _('hour(s)') }}</dd>
       <dt>{{ _('Host') }}</dt><dd>{{ user.render_inline(owner_udoc, badge=false) }}</dd>
       <dt>{{ _('Partic.') }}</dt><dd>{{ tdoc['attend']|default(0) }}</dd>
diff --git a/packages/utils/package.json b/packages/utils/package.json
index ed861ae24..a2060ee43 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -12,7 +12,7 @@
         "js-yaml": "^4.1.0",
         "moment-timezone": "^0.5.34",
         "mongodb": "^3.7.3",
-        "systeminformation": "^5.11.22"
+        "systeminformation": "^5.11.24"
     },
     "devDependencies": {
         "@types/fs-extra": "^9.0.13"
diff --git a/packages/vjudge/package.json b/packages/vjudge/package.json
index e06ed4417..e8537ed75 100644
--- a/packages/vjudge/package.json
+++ b/packages/vjudge/package.json
@@ -12,10 +12,10 @@
         "chrome-finder": "^1.0.7",
         "jsdom": "^19.0.0",
         "lodash": "^4.17.21",
-        "puppeteer-core": "^15.1.1",
+        "puppeteer-core": "^15.3.2",
         "puppeteer-extra": "3.3.0",
-        "puppeteer-extra-plugin-portal": "^3.1.0",
-        "puppeteer-extra-plugin-stealth": "^2.10.1",
+        "puppeteer-extra-plugin-portal": "3.1.0",
+        "puppeteer-extra-plugin-stealth": "2.10.1",
         "superagent": "^7.1.5",
         "superagent-proxy": "^3.0.0"
     },