98 lines
3.8 KiB
Dart
98 lines
3.8 KiB
Dart
import 'dart:convert';
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import 'school_navigation_policy.dart';
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/// Only serialize recognized table fragments, never a login document.
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const schoolPageProbeScript = r'''(() => {
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const trusted = value => {
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try {
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const u = new URL(value);
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return u.hostname === 'yjsjy.uestc.edu.cn' && !u.username && !u.password &&
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((u.protocol === 'https:' && (!u.port || u.port === '443')) ||
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(u.protocol === 'http:' && (!u.port || u.port === '80'))) &&
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/^\/pyxx(?:\/|$)/.test(u.pathname);
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} catch (_) { return false; }
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};
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const topUrl = location.href;
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const result = {topUrl, authenticated: false, pages: []};
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if (!trusted(topUrl) || document.querySelector('input[type="password"]')) {
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return JSON.stringify(result);
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}
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const topOrigin = new URL(topUrl).origin;
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const home = /^\/pyxx\/home\/(?:index)?\/?$/.test(location.pathname);
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const chrome = document.querySelector('#navbar') && document.querySelector('#main-container');
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result.authenticated = typeof window.logout === 'function' && Boolean(chrome || home);
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const seen = new Set();
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const visit = (doc, depth) => {
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if (!doc || depth > 4 || seen.size >= 16 || seen.has(doc)) return;
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seen.add(doc);
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let url;
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try { url = doc.location.href; } catch (_) { return; }
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if (!trusted(url) || new URL(url).origin !== topOrigin ||
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doc.querySelector('input[type="password"]')) return;
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for (const [kind, tableId, termId] of [
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['timetable', '#tbl', '#drpxq'], ['exams', '#sample-table-1', '#xqbh']
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]) {
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const table = doc.querySelector(tableId), term = doc.querySelector(termId);
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if (!table || !term || !term.options || term.selectedIndex < 0) continue;
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const selected = term.cloneNode(true);
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Array.from(selected.options).forEach((option, index) => {
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if (index === term.selectedIndex) option.setAttribute('selected', 'selected');
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else option.removeAttribute('selected');
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});
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const html = selected.outerHTML + table.outerHTML;
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if (html.length <= 2 * 1024 * 1024) result.pages.push({kind, url, html});
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}
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for (const frame of doc.querySelectorAll('iframe,frame')) {
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try { visit(frame.contentDocument, depth + 1); } catch (_) {}
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}
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};
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visit(document, 0);
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return JSON.stringify(result);
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})()''';
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class SchoolTableFragment {
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const SchoolTableFragment(this.kind, this.url, this.html);
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final String kind;
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final Uri url;
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final String html;
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}
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class SchoolPageEvidence {
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const SchoolPageEvidence(this.authenticated, this.pages);
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final bool authenticated;
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final List<SchoolTableFragment> pages;
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static SchoolPageEvidence decode(Object raw, Uri current) {
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dynamic value = raw;
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for (var i = 0; i < 2 && value is String; i++) {
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value = jsonDecode(value);
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}
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if (value is! Map ||
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value['topUrl'] != current.toString() ||
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!SchoolNavigationPolicy.isGraduatePage(current)) {
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throw const FormatException('Untrusted school page evidence');
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}
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final pages = <SchoolTableFragment>[];
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final candidates = value['pages'];
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if (candidates is List && candidates.length <= 32) {
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for (final page in candidates) {
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if (page is! Map || page['url'] is! String || page['html'] is! String) {
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continue;
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}
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final uri = Uri.tryParse(page['url'] as String);
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final content = page['html'] as String;
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if (uri == null ||
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!SchoolNavigationPolicy.isGraduatePage(uri) ||
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uri.origin != current.origin ||
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utf8.encode(content).length > 2 * 1024 * 1024 ||
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!const ['timetable', 'exams'].contains(page['kind'])) {
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continue;
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}
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pages.add(SchoolTableFragment(page['kind'] as String, uri, content));
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}
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}
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return SchoolPageEvidence(value['authenticated'] == true, pages);
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}
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}
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