708 lines
22 KiB
Dart
708 lines
22 KiB
Dart
import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import '../../data/json_schedule_import.dart';
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import '../../domain/exam_schedule.dart';
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import '../../domain/school_term.dart';
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import '../../services/diagnostic_log.dart';
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import 'school_navigation_policy.dart';
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import 'school_page_adapter.dart';
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import 'school_exam_adapter.dart';
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import 'school_login_flow.dart';
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import 'school_page_probe.dart';
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import 'school_browser.dart';
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import 'school_browser_diagnostics.dart';
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enum SchoolConnectionState {
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signedOut,
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authenticating,
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connected,
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expired,
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unknown,
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}
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class SchoolSession extends ChangeNotifier {
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SchoolSession({this.configureBrowser = configureSchoolBrowser});
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final SchoolBrowserConfigurator configureBrowser;
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Future<SchoolBrowserInfo>? _browserReady;
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String? browserVersion;
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Future<void> _loadRequest(Uri uri) async {
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final controller = web, generation = _pageGeneration, serial = _openSerial;
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try {
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final info = await (_browserReady ??= configureBrowser(
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controller,
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'graduate',
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));
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if (!hasOpened ||
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generation != _pageGeneration ||
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serial != _openSerial) {
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return;
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}
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browserVersion = info.chromiumVersion;
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await controller.loadRequest(uri);
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} catch (_) {
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_browserReady = null;
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rethrow;
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}
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}
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// Creating Android WebView starts its browser engine. Do it on school access,
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// not while the student is opening an offline timetable.
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late final WebViewController web = _createWeb();
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WebViewController _createWeb() => WebViewController()
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..setJavaScriptMode(JavaScriptMode.unrestricted)
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..setNavigationDelegate(
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NavigationDelegate(
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onNavigationRequest: (request) async {
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final uri = Uri.tryParse(request.url);
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final upgrade = uri == null || !request.isMainFrame
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? null
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: SchoolNavigationPolicy.secureIdentityRedirect(uri);
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if (upgrade != null) {
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final generation = _pageGeneration;
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try {
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await _loadRequest(upgrade);
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} catch (_) {
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if (generation == _pageGeneration) {
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_failure(
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'学校身份认证暂时无法打开，请重试。',
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code: 'authentication_load_failed',
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);
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}
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}
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return NavigationDecision.prevent;
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}
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if (uri == null ||
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!SchoolNavigationPolicy.canNavigate(
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uri,
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isMainFrame: request.isMainFrame,
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)) {
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DiagnosticLog.instance.resourceFailure(
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'graduate',
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request.url,
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code: 'blocked_navigation',
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mainFrame: request.isMainFrame,
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);
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if (kDebugMode && request.isMainFrame) {
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debugPrint(
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'Blocked school navigation origin: ${uri?.scheme}://${uri?.host}',
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);
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}
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if (request.isMainFrame) {
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_failure('学校跳转到了其他地址，请返回学校认证入口重试。', code: 'blocked_navigation');
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}
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return NavigationDecision.prevent;
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}
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return NavigationDecision.navigate;
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},
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onPageStarted: (url) {
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DiagnosticLog.instance.navigation('graduate', 'started', url);
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_poll?.cancel();
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_manualRead = false;
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_pageGeneration++;
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_reader.invalidate();
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pendingDraft = null;
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pendingExams = null;
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if (!hasOpened || _routeClosed) return;
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_loading = true;
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notifyListeners();
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},
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onPageFinished: (url) {
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final generation = _pageGeneration;
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unawaited(
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recordSchoolPageDiagnostics(
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web,
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'graduate',
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url,
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isCurrent: () =>
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hasOpened && !_routeClosed && generation == _pageGeneration,
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),
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);
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unawaited(_loaded(url));
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},
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onWebResourceError: (error) async {
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DiagnosticLog.instance.resourceFailure(
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'graduate',
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error.url,
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code: 'web_resource_error',
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status: error.errorCode,
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mainFrame: error.isForMainFrame,
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);
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if (error.isForMainFrame != true || error.url == null) return;
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final generation = _pageGeneration;
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final current = await web.currentUrl();
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if (hasOpened &&
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generation == _pageGeneration &&
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error.url == current) {
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_failure(
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'学校页面暂时未能加载，请检查网络后重试。',
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code: 'web_resource_error',
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status: error.errorCode,
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);
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}
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},
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onHttpError: (error) async {
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DiagnosticLog.instance.resourceFailure(
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'graduate',
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error.request?.uri.toString(),
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code: 'http_error',
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status: error.response?.statusCode,
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);
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final generation = _pageGeneration;
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final current = Uri.tryParse(await web.currentUrl() ?? '');
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if (hasOpened &&
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generation == _pageGeneration &&
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error.request != null &&
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error.request!.uri == current) {
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_failure(
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'学校请求未完成，请稍后重试。',
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code: 'http_error',
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status: error.response?.statusCode,
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);
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}
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},
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),
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);
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final _reader = SchoolReader(SchoolPageAdapter());
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final _flow = SchoolLoginFlow();
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Timer? _timeout;
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Timer? _poll;
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bool _readingActive = false, _manualRead = false;
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bool _routeClosed = false;
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int _pollsLeft = 0;
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int? _probeGeneration;
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SchoolConnectionState connectionState = SchoolConnectionState.signedOut;
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bool _loading = false,
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hasOpened = false,
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finding = false,
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requestingExams = false;
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bool logoutFailed = false;
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bool get canLogout => hasOpened || logoutFailed;
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bool get busy => _loading || _reader.busy;
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int _pageGeneration = 0;
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int get pageGeneration => _pageGeneration;
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Future<void>? _logoutFuture;
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int _openSerial = 0;
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ImportDraft? pendingDraft;
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ExamSchedule? pendingExams;
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SchoolTerm? selectedTerm;
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bool _termSelectionRequested = true;
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bool _termSelectionReady = false;
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List<SchoolTerm> _liveTerms = const [];
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bool get needsTermSelection =>
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hasOpened &&
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connectionState == SchoolConnectionState.connected &&
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_termSelectionRequested &&
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_termSelectionReady;
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List<SchoolTerm> get termChoices {
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final terms = [...(_liveTerms.isEmpty ? SchoolTerm.choices : _liveTerms)];
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if (selectedTerm != null && !terms.contains(selectedTerm)) {
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terms.add(selectedTerm!);
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}
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return terms..sort((a, b) => b.id.compareTo(a.id));
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}
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String message = '请在学校网页中完成登录与验证码。';
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String get statusLabel => logoutFailed
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? '学校退出未完成，请重试'
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: switch (connectionState) {
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SchoolConnectionState.signedOut => '未登录',
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SchoolConnectionState.authenticating => '请在学校页面完成认证',
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SchoolConnectionState.connected => '研究生系统已连接',
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SchoolConnectionState.expired => '学校登录已过期',
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SchoolConnectionState.unknown => '学校连接未确认',
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};
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// HTTPS entry produces the same official HTTP service callback. Do not drop
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// the graduate-service query by opening a generic identity login page.
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static final authUrl = Uri.parse(
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'https://yjsjy.uestc.edu.cn/pyxx/jzsso/login',
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);
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static final timetableUrl = Uri.parse(
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'https://yjsjy.uestc.edu.cn/pyxx/pygl/xskbcx/index/73',
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);
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static final examUrl = Uri.parse(
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'https://yjsjy.uestc.edu.cn/pyxx/pygl/kskcxx/index?xq=73',
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);
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Uri get _target => requestingExams
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? (selectedTerm?.examUri ?? examUrl)
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: (selectedTerm?.timetableUri ?? timetableUrl);
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Future<void> open() => _open(exams: false);
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Future<void> openTimetable({SchoolTerm? term, bool chooseTerm = false}) =>
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_open(exams: false, term: term, chooseTerm: chooseTerm);
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Future<void> openExams({SchoolTerm? term, bool chooseTerm = false}) =>
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_open(exams: true, term: term, chooseTerm: chooseTerm);
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Future<void> openAuthentication() => _open(
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exams: requestingExams,
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term: selectedTerm,
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chooseTerm: _termSelectionRequested,
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forceAuth: true,
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);
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Future<void> _open({
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required bool exams,
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SchoolTerm? term,
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bool chooseTerm = false,
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bool forceAuth = false,
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}) async {
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final serial = ++_openSerial;
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DiagnosticLog.instance.add(
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'login_opened',
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fields: {
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'school': 'graduate',
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'phase': exams ? 'exams' : 'timetable',
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'term': term?.id,
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},
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);
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final closing = _logoutFuture;
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if (closing != null) await closing;
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if (serial != _openSerial) return;
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_timeout?.cancel();
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_poll?.cancel();
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_manualRead = false;
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_pageGeneration++;
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_reader.invalidate();
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final generation = _pageGeneration;
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pendingDraft = null;
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pendingExams = null;
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selectedTerm = term;
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_termSelectionRequested = chooseTerm || term == null;
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_termSelectionReady = false;
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requestingExams = exams;
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logoutFailed = false;
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hasOpened = true;
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_loading = true;
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_flow.begin(_target);
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final connected =
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connectionState == SchoolConnectionState.connected && !forceAuth;
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_termSelectionReady = connected;
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finding = connected && !needsTermSelection;
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_loading = !needsTermSelection;
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message = needsTermSelection
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? '请选择要导入的学校学期。'
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: connected
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? _findingMessage
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: '请在学校网页中完成登录与验证码。';
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if (finding) _armTimeout();
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notifyListeners();
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if (needsTermSelection) return;
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try {
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await _loadRequest(connected ? _target : authUrl);
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} catch (_) {
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if (serial == _openSerial && generation == _pageGeneration) {
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_failure('学校入口无法打开，请检查校园网络后重试。', code: 'entry_load_failed');
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}
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}
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}
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Future<void> selectTerm(SchoolTerm term) async {
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if (!hasOpened ||
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!needsTermSelection ||
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connectionState != SchoolConnectionState.connected ||
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!termChoices.contains(term)) {
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return;
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}
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final serial = ++_openSerial;
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_poll?.cancel();
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_timeout?.cancel();
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_pageGeneration++;
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_reader.invalidate();
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final generation = _pageGeneration;
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pendingDraft = null;
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pendingExams = null;
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selectedTerm = term;
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_termSelectionRequested = false;
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_manualRead = false;
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_flow.begin(_target);
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finding = true;
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_loading = true;
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message = _findingMessage;
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_armTimeout();
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notifyListeners();
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try {
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await _loadRequest(_target);
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} catch (_) {
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if (serial == _openSerial && generation == _pageGeneration) {
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_failure('学校学期查询页面暂时无法打开，请重试。', code: 'query_load_failed');
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}
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}
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}
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String get _findingMessage => requestingExams ? '正在查找考试安排，请稍候' : '正在查找课表，请稍候';
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void _armTimeout() {
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_timeout?.cancel();
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_timeout = Timer(
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const Duration(seconds: 45),
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() => _failure('查找超时，请检查学校页面后重试。已有数据保持不变。', code: 'read_timeout'),
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);
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}
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void _failure(String text, {String code = 'flow_failure', int? status}) {
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DiagnosticLog.instance.add(
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'school_read_failed',
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fields: {
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'school': 'graduate',
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'code': code,
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'status': status,
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'term': selectedTerm?.id,
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},
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);
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if (!hasOpened || _routeClosed) return;
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_pageGeneration++;
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_reader.invalidate();
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_timeout?.cancel();
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_poll?.cancel();
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pendingDraft = null;
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pendingExams = null;
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finding = false;
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_loading = false;
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message = text;
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notifyListeners();
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}
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/// Poll only while the authentication screen is open. Navigation callbacks
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/// still read immediately; polling handles scripts and frames ready later.
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void setReadingActive(bool active) {
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if (_readingActive == active && _routeClosed == !active) return;
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_readingActive = active;
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_routeClosed = !active;
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_poll?.cancel();
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if (active && hasOpened) {
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web.currentUrl().then((url) {
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if (_readingActive && url != null) _loaded(url);
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});
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} else if (!active) {
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_pageGeneration++;
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_reader.invalidate();
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_timeout?.cancel();
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pendingDraft = null;
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pendingExams = null;
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finding = false;
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_loading = false;
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}
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}
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void _scheduleProbe(String url, int generation) {
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if (!_readingActive ||
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!hasOpened ||
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generation != _pageGeneration ||
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needsTermSelection ||
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pendingDraft != null ||
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pendingExams != null) {
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return;
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}
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_poll?.cancel();
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if (_pollsLeft-- <= 0) {
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if (finding) _failure('查找超时，请检查学校页面后重试。已有数据保持不变。', code: 'read_timeout');
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return;
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}
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_poll = Timer(const Duration(milliseconds: 750), () {
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_loaded(url, resetPolling: false);
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});
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}
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Future<SchoolPageEvidence> _evidence(Uri uri) async =>
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SchoolPageEvidence.decode(
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await web.runJavaScriptReturningResult(schoolPageProbeScript),
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uri,
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);
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Future<void> _loaded(String url, {bool resetPolling = true}) async {
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if (resetPolling) {
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DiagnosticLog.instance.navigation('graduate', 'finished', url);
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}
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if (!hasOpened || _routeClosed) return;
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final generation = _pageGeneration;
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final uri = Uri.tryParse(url);
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final current = await web.currentUrl();
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if (!hasOpened ||
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generation != _pageGeneration ||
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current != url ||
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uri == null ||
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!SchoolNavigationPolicy.isSchoolPage(uri)) {
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return;
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}
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_loading = false;
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if (pendingDraft != null || pendingExams != null) return;
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if (uri.host == 'idas.uestc.edu.cn') {
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_termSelectionReady = false;
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_timeout?.cancel();
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finding = false;
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connectionState = SchoolConnectionState.authenticating;
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_flow.onLoaded(uri, authenticated: false);
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message = '请在学校网页中完成登录与验证码。';
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notifyListeners();
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return;
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}
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if (!SchoolNavigationPolicy.isGraduatePage(uri) ||
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_probeGeneration == generation) {
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return;
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}
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if (resetPolling) _pollsLeft = 60;
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_probeGeneration = generation;
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final targetPage = requestingExams
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? SchoolNavigationPolicy.isExam(uri)
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: SchoolNavigationPolicy.isTimetable(uri);
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if (!_termSelectionRequested && (targetPage || _manualRead)) {
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finding = true;
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message = _findingMessage;
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notifyListeners();
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if (_timeout?.isActive != true) _armTimeout();
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}
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try {
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final evidence = await _evidence(uri);
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DiagnosticLog.instance.add(
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'school_evidence',
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fields: {
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'school': 'graduate',
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'result': evidence.authenticated,
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'count': evidence.pages.length,
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'term': selectedTerm?.id,
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},
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);
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if (!hasOpened ||
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generation != _pageGeneration ||
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await web.currentUrl() != url) {
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return;
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}
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if (evidence.terms.isNotEmpty) _liveTerms = evidence.terms;
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if (_termSelectionRequested) {
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if (evidence.authenticated || evidence.pages.isNotEmpty) {
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connectionState = SchoolConnectionState.connected;
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_termSelectionReady = true;
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_timeout?.cancel();
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_poll?.cancel();
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finding = false;
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message = '请选择要导入的学校学期。';
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notifyListeners();
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}
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return;
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}
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for (final page in evidence.pages) {
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if (page.kind != (requestingExams ? 'exams' : 'timetable')) continue;
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try {
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if (requestingExams) {
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final draft = SchoolExamAdapter.extract(page.html);
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if (generation != _pageGeneration) return;
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if (draft.termId != selectedTerm?.id.toString()) {
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DiagnosticLog.instance.add(
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'term_mismatch',
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fields: {'school': 'graduate'},
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);
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continue;
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}
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pendingExams = draft;
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} else {
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// The probe validates the live document's origin. The strict parser
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// gets only its recognized fragment with the canonical table path.
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final draft = await _reader.read(_target, () async => page.html);
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if (!hasOpened || generation != _pageGeneration) return;
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if (draft.schoolTerm != selectedTerm) {
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DiagnosticLog.instance.add(
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'term_mismatch',
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fields: {'school': 'graduate'},
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);
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continue;
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}
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pendingDraft = draft;
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}
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_timeout?.cancel();
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_poll?.cancel();
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connectionState = SchoolConnectionState.connected;
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finding = true;
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message = '读取成功，正在保存…';
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DiagnosticLog.instance.add(
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'school_parsed',
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fields: {
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'school': 'graduate',
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'phase': requestingExams ? 'exams' : 'timetable',
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'count':
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pendingDraft?.courses.length ??
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pendingExams?.records.length ??
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0,
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},
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);
|
|
notifyListeners();
|
|
return;
|
|
} catch (error) {
|
|
DiagnosticLog.instance.add(
|
|
'school_parse_rejected',
|
|
fields: {
|
|
'school': 'graduate',
|
|
'code': error.runtimeType.toString(),
|
|
},
|
|
);
|
|
if (generation != _pageGeneration) return;
|
|
// A recognized table can still be incomplete during asynchronous load.
|
|
}
|
|
}
|
|
if (!hasOpened || generation != _pageGeneration) return;
|
|
final next = _manualRead
|
|
? null
|
|
: _flow.onLoaded(uri, authenticated: evidence.authenticated);
|
|
if (next != null) {
|
|
DiagnosticLog.instance.add(
|
|
'school_redirect_requested',
|
|
fields: {
|
|
'school': 'graduate',
|
|
'phase': requestingExams ? 'exams' : 'timetable',
|
|
'term': selectedTerm?.id,
|
|
},
|
|
);
|
|
finding = true;
|
|
_loading = true;
|
|
message = _findingMessage;
|
|
_armTimeout();
|
|
notifyListeners();
|
|
try {
|
|
await _loadRequest(next);
|
|
} catch (_) {
|
|
if (generation == _pageGeneration) {
|
|
_failure('课表查询页面暂时无法打开，请重试。', code: 'query_load_failed');
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if (!finding) message = '请在学校网页完成认证；进入研究生系统后会自动读取。';
|
|
} catch (error) {
|
|
DiagnosticLog.instance.add(
|
|
'school_probe_failed',
|
|
fields: {'school': 'graduate', 'code': error.runtimeType.toString()},
|
|
);
|
|
} finally {
|
|
if (_probeGeneration == generation) _probeGeneration = null;
|
|
_scheduleProbe(url, generation);
|
|
}
|
|
if (hasOpened && generation == _pageGeneration) notifyListeners();
|
|
}
|
|
|
|
Future<ImportDraft> readTimetable() async {
|
|
if (_termSelectionRequested || selectedTerm == null) {
|
|
throw UnsupportedSchoolLayout();
|
|
}
|
|
final generation = _pageGeneration;
|
|
final uri = Uri.tryParse(await web.currentUrl() ?? '');
|
|
if (uri == null || !SchoolNavigationPolicy.isGraduatePage(uri)) {
|
|
throw UnsupportedSchoolLayout();
|
|
}
|
|
final evidence = await _evidence(uri);
|
|
if (generation != _pageGeneration ||
|
|
await web.currentUrl() != uri.toString()) {
|
|
throw UnsupportedSchoolLayout();
|
|
}
|
|
for (final page in evidence.pages) {
|
|
if (page.kind != 'timetable') continue;
|
|
try {
|
|
final draft = await _reader.read(
|
|
selectedTerm!.timetableUri,
|
|
() async => page.html,
|
|
);
|
|
if (draft.schoolTerm != selectedTerm) continue;
|
|
return draft;
|
|
} on UnsupportedSchoolLayout {
|
|
if (generation != _pageGeneration) rethrow;
|
|
}
|
|
}
|
|
throw UnsupportedSchoolLayout();
|
|
}
|
|
|
|
Future<void> readCurrentPage() async {
|
|
if (needsTermSelection) return;
|
|
_poll?.cancel();
|
|
_timeout?.cancel();
|
|
_pageGeneration++;
|
|
_reader.invalidate();
|
|
pendingDraft = null;
|
|
pendingExams = null;
|
|
_manualRead = true;
|
|
final url = await web.currentUrl();
|
|
if (url != null) await _loaded(url);
|
|
}
|
|
|
|
bool saved({
|
|
required bool success,
|
|
required int generation,
|
|
ImportDraft? draft,
|
|
ExamSchedule? exams,
|
|
}) {
|
|
if (generation != _pageGeneration ||
|
|
draft != pendingDraft ||
|
|
exams != pendingExams) {
|
|
return false;
|
|
}
|
|
pendingDraft = null;
|
|
pendingExams = null;
|
|
finding = false;
|
|
message = success
|
|
? '${requestingExams ? '考试安排' : '课表'}已导入并在本机保存。'
|
|
: '保存未完成，请重试。';
|
|
notifyListeners();
|
|
return true;
|
|
}
|
|
|
|
Future<void> logout() {
|
|
if (_logoutFuture != null) return _logoutFuture!;
|
|
final future = _performLogout();
|
|
_logoutFuture = future;
|
|
return future.whenComplete(() => _logoutFuture = null);
|
|
}
|
|
|
|
void invalidateAuthentication() {
|
|
_openSerial++;
|
|
_pageGeneration++;
|
|
_reader.invalidate();
|
|
_flow.reset();
|
|
_poll?.cancel();
|
|
_timeout?.cancel();
|
|
_readingActive = false;
|
|
_routeClosed = true;
|
|
hasOpened = false;
|
|
pendingDraft = null;
|
|
pendingExams = null;
|
|
finding = false;
|
|
_loading = false;
|
|
connectionState = SchoolConnectionState.signedOut;
|
|
message = '学校登录已退出';
|
|
notifyListeners();
|
|
}
|
|
|
|
Future<void> _performLogout() async {
|
|
_openSerial++;
|
|
_pageGeneration++;
|
|
_reader.invalidate();
|
|
_flow.reset();
|
|
_timeout?.cancel();
|
|
_poll?.cancel();
|
|
hasOpened = false;
|
|
pendingDraft = null;
|
|
pendingExams = null;
|
|
finding = false;
|
|
var failed = false;
|
|
try {
|
|
await WebViewCookieManager().clearCookies();
|
|
await web.clearCache();
|
|
await web.clearLocalStorage();
|
|
await web.loadHtmlString('<html></html>');
|
|
} catch (_) {
|
|
failed = true;
|
|
}
|
|
_loading = false;
|
|
logoutFailed = failed;
|
|
connectionState = failed
|
|
? SchoolConnectionState.unknown
|
|
: SchoolConnectionState.signedOut;
|
|
message = failed ? '学校退出未完成，请重试；重新连接会再次经过学校认证。' : '已退出学校登录。';
|
|
notifyListeners();
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
hasOpened = false;
|
|
_pageGeneration++;
|
|
_reader.invalidate();
|
|
_timeout?.cancel();
|
|
_poll?.cancel();
|
|
super.dispose();
|
|
}
|
|
}
|