feat: 添加 H5 线路切换功能；支持动态加载和切换不同线路的 URL

README.md

@@ -6,6 +6,22 @@ Flutter WebView 套壳 App，默认加载：
 https://h5-test.imharry.work/
 ```
 
+## H5 线路切换
+
+线路切换在 Flutter 套壳层完成，H5 页面不需要承载线路切换逻辑。每条线路都是一个独立 H5 地址，切换时 WebView 会直接加载被选中的地址。
+
+默认线路配置在：
+
+```text
+openim_common/lib/src/config.dart
+```
+
+也可以在打包时覆盖：
+
+```bash
+flutter build apk --release --dart-define=H5_LINE_URLS=https://h5-one.example/,https://h5-two.example/
+```
+
 ## 本地打包
 
 ```bash

lib/config/app_config.dart

@@ -1,12 +1,35 @@
+import 'package:openim_common/openim_common.dart' as openim_common;
+
 enum Environment {
   production,
 }
 
+class H5Line {
+  const H5Line({
+    required this.label,
+    required this.url,
+  });
+
+  final String label;
+  final String url;
+
+  Uri get uri => Uri.parse(url);
+
+  String get displayAddress {
+    final parsed = uri;
+    final host = parsed.hasPort ? '${parsed.host}:${parsed.port}' : parsed.host;
+    final path = parsed.path.isEmpty || parsed.path == '/' ? '' : parsed.path;
+    return '$host$path';
+  }
+}
+
 class AppConfig {
   static const Environment currentEnvironment = Environment.production;
   static const String appName = '本地打包';
   static const String appLogo = '';
   static const String canonicalWebHost = 'h5-test.imharry.work';
+  static const String _dartDefinedH5LineUrls =
+      String.fromEnvironment('H5_LINE_URLS');
   static const Set<String> legacyWebHosts = {
     'h5-test.imharry.work',
   };
@@ -18,14 +41,34 @@ class AppConfig {
   };
 
   static List<String> get environmentHosts {
-    return _environmentHosts[currentEnvironment] ?? const [];
+    final generatedHosts = _normalizedUniqueUrls(
+      openim_common.Config.environmentHosts,
+    );
+    if (generatedHosts.isNotEmpty) {
+      return generatedHosts;
+    }
+
+    return _normalizedUniqueUrls(_environmentHosts[currentEnvironment] ?? []);
   }
 
-  static String homeUrl({String? appName, String? appLogo}) {
-    final host =
-        environmentHosts.isNotEmpty ? environmentHosts.first : canonicalWebHost;
-    final uri = Uri.parse(_normalizeHomeUrl(host));
-    return uri.toString();
+  static List<H5Line> get h5Lines {
+    final configuredUrls = _dartDefinedH5LineUrls.trim().isEmpty
+        ? environmentHosts
+        : _normalizedUniqueUrls(_dartDefinedH5LineUrls.split(','));
+    final urls = configuredUrls.isEmpty
+        ? _normalizedUniqueUrls(const [canonicalWebHost])
+        : configuredUrls;
+
+    return [
+      for (var index = 0; index < urls.length; index += 1)
+        H5Line(label: '线路${index + 1}', url: urls[index]),
+    ];
+  }
+
+  static String homeUrl({int lineIndex = 0, String? appName, String? appLogo}) {
+    final lines = h5Lines;
+    final safeIndex = _safeLineIndex(lineIndex, lines.length);
+    return lines[safeIndex].url;
   }
 
   static String withFreshShellParams(String url) {
@@ -39,13 +82,14 @@ class AppConfig {
     }
 
     final host = uri.host.toLowerCase();
-    return legacyWebHosts.contains(host) || _hasShellParams(uri);
+    return (legacyWebHosts.contains(host) && !_isConfiguredH5Host(host)) ||
+        _hasShellParams(uri);
   }
 
   static String canonicalizeMainFrameUrl(String url) {
     final uri = _removeShellParams(Uri.parse(url));
     final host = uri.host.toLowerCase();
-    if (!legacyWebHosts.contains(host)) {
+    if (!legacyWebHosts.contains(host) || _isConfiguredH5Host(host)) {
       return uri.toString();
     }
 
@@ -57,6 +101,21 @@ class AppConfig {
         .toString();
   }
 
+  static int? lineIndexForUrl(String url) {
+    final uri = Uri.tryParse(url);
+    if (uri == null) {
+      return null;
+    }
+
+    final lines = h5Lines;
+    for (var index = 0; index < lines.length; index += 1) {
+      if (_isSameLine(lines[index].uri, uri)) {
+        return index;
+      }
+    }
+    return null;
+  }
+
   static Uri _removeShellParams(Uri uri) {
     final queryParameters = Map<String, String>.from(uri.queryParameters);
     queryParameters.remove('flutter_shell');
@@ -85,8 +144,70 @@ class AppConfig {
         fragmentParameters.containsKey('shell_app_logo');
   }
 
+  static int _safeLineIndex(int index, int length) {
+    if (length <= 0 || index < 0 || index >= length) {
+      return 0;
+    }
+    return index;
+  }
+
+  static bool _isConfiguredH5Host(String host) {
+    return h5Lines.any((line) => line.uri.host.toLowerCase() == host);
+  }
+
+  static bool _isSameLine(Uri lineUri, Uri uri) {
+    if (lineUri.host.toLowerCase() != uri.host.toLowerCase()) {
+      return false;
+    }
+    if (lineUri.hasPort && lineUri.port != uri.port) {
+      return false;
+    }
+    if (lineUri.scheme.isNotEmpty && lineUri.scheme != uri.scheme) {
+      return false;
+    }
+
+    final linePath = _pathWithTrailingSlash(lineUri.path);
+    final uriPath = _pathWithTrailingSlash(uri.path);
+    return linePath == '/' || uriPath.startsWith(linePath);
+  }
+
+  static String _pathWithTrailingSlash(String path) {
+    if (path.isEmpty) {
+      return '/';
+    }
+    return path.endsWith('/') ? path : '$path/';
+  }
+
+  static List<String> _normalizedUniqueUrls(Iterable<String> values) {
+    final urls = <String>[];
+    final seen = <String>{};
+
+    for (final value in values) {
+      final normalized = _tryNormalizeHomeUrl(value);
+      if (normalized == null || seen.contains(normalized)) {
+        continue;
+      }
+      urls.add(normalized);
+      seen.add(normalized);
+    }
+
+    return List.unmodifiable(urls);
+  }
+
+  static String? _tryNormalizeHomeUrl(String value) {
+    try {
+      return _normalizeHomeUrl(value);
+    } catch (_) {
+      return null;
+    }
+  }
+
   static String _normalizeHomeUrl(String host) {
     final value = host.trim();
+    if (value.isEmpty) {
+      throw const FormatException('Empty H5 line URL');
+    }
+
     final normalized =
         value.startsWith('http://') || value.startsWith('https://')
             ? value

lib/main.dart

@@ -94,17 +94,22 @@ class H5ShellPage extends StatefulWidget {
 
 class _H5ShellPageState extends State<H5ShellPage> {
   late final WebViewController _controller;
+  late final List<H5Line> _h5Lines;
 
   int _progress = 0;
   String? _loadError;
   bool _showShellCover = true;
   bool _shellBrandingLoaded = false;
+  int _currentLineIndex = 0;
   Timer? _shellCoverFallbackTimer;
   late ShellBranding _shellBranding;
 
+  H5Line get _currentLine => _h5Lines[_currentLineIndex];
+
   @override
   void initState() {
     super.initState();
+    _h5Lines = AppConfig.h5Lines;
     _shellBranding = widget.initialShellBranding;
     _controller = _buildController();
     unawaited(_loadHome());
@@ -125,10 +130,14 @@ class _H5ShellPageState extends State<H5ShellPage> {
               setState(() => _progress = progress);
             }
           },
-          onPageStarted: (_) {
+          onPageStarted: (url) {
             _shellCoverFallbackTimer?.cancel();
+            final lineIndex = AppConfig.lineIndexForUrl(url);
             if (mounted) {
               setState(() {
+                if (lineIndex != null) {
+                  _currentLineIndex = lineIndex;
+                }
                 _loadError = null;
                 _progress = 0;
                 _showShellCover = true;
@@ -169,7 +178,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
   }
 
   String _freshHomeUrl() {
-    return AppConfig.homeUrl();
+    return AppConfig.homeUrl(lineIndex: _currentLineIndex);
   }
 
   Future<void> _handlePageFinished() async {
@@ -256,10 +265,14 @@ class _H5ShellPageState extends State<H5ShellPage> {
 
   Future<void> _loadUrl(String url) async {
     final targetUrl = AppConfig.canonicalizeMainFrameUrl(url);
+    final lineIndex = AppConfig.lineIndexForUrl(targetUrl);
 
     if (mounted) {
       _shellCoverFallbackTimer?.cancel();
       setState(() {
+        if (lineIndex != null) {
+          _currentLineIndex = lineIndex;
+        }
         _loadError = null;
         _progress = 0;
         _showShellCover = true;
@@ -269,6 +282,41 @@ class _H5ShellPageState extends State<H5ShellPage> {
     await _controller.loadRequest(Uri.parse(targetUrl));
   }
 
+  Future<void> _loadLine(int index) async {
+    final safeIndex = index < 0 || index >= _h5Lines.length ? 0 : index;
+    if (mounted) {
+      setState(() {
+        _currentLineIndex = safeIndex;
+      });
+    }
+
+    await _loadUrl(_h5Lines[safeIndex].url);
+  }
+
+  void _showLineSwitcher() {
+    showModalBottomSheet<void>(
+      context: context,
+      useSafeArea: true,
+      showDragHandle: true,
+      backgroundColor: Colors.white,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
+      ),
+      builder: (sheetContext) {
+        return _LineSwitcherSheet(
+          lines: _h5Lines,
+          currentIndex: _currentLineIndex,
+          onSelect: (index) {
+            Navigator.of(sheetContext).pop();
+            if (index != _currentLineIndex) {
+              unawaited(_loadLine(index));
+            }
+          },
+        );
+      },
+    );
+  }
+
   Future<NavigationDecision> _handleNavigationRequest(
     NavigationRequest request,
   ) async {
@@ -306,6 +354,10 @@ class _H5ShellPageState extends State<H5ShellPage> {
 
   @override
   Widget build(BuildContext context) {
+    final bottomInset = MediaQuery.viewInsetsOf(context).bottom;
+    final showLineSwitch =
+        !_showShellCover && _loadError == null && bottomInset == 0;
+
     return PopScope(
       canPop: false,
       onPopInvokedWithResult: (didPop, _) {
@@ -337,6 +389,16 @@ class _H5ShellPageState extends State<H5ShellPage> {
                   message: _loadError!,
                   onRetry: () => unawaited(_loadHome()),
                 ),
+              if (showLineSwitch)
+                Positioned(
+                  left: 20,
+                  right: 20,
+                  bottom: MediaQuery.paddingOf(context).bottom + 14,
+                  child: _LineSwitchBar(
+                    currentLine: _currentLine,
+                    onSwitch: _showLineSwitcher,
+                  ),
+                ),
             ],
           ),
         ),
@@ -386,6 +448,233 @@ class _ErrorPanel extends StatelessWidget {
   }
 }
 
+class _LineSwitchBar extends StatelessWidget {
+  const _LineSwitchBar({
+    required this.currentLine,
+    required this.onSwitch,
+  });
+
+  final H5Line currentLine;
+  final VoidCallback onSwitch;
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: ConstrainedBox(
+        constraints: const BoxConstraints(maxWidth: 560),
+        child: SizedBox(
+          width: double.infinity,
+          child: Material(
+            color: Colors.white.withValues(alpha: 0.94),
+            elevation: 8,
+            shadowColor: const Color(0xFF0F4C81).withValues(alpha: 0.12),
+            borderRadius: BorderRadius.circular(32),
+            child: InkWell(
+              onTap: onSwitch,
+              borderRadius: BorderRadius.circular(32),
+              child: Container(
+                height: 64,
+                padding: const EdgeInsets.symmetric(horizontal: 18),
+                decoration: BoxDecoration(
+                  borderRadius: BorderRadius.circular(32),
+                  border: Border.all(color: const Color(0xFFE1EAF5)),
+                ),
+                child: Row(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    const Icon(
+                      Icons.sync_rounded,
+                      size: 19,
+                      color: _shellSubText,
+                    ),
+                    const SizedBox(width: 8),
+                    const Text(
+                      '当前: ',
+                      style: TextStyle(
+                        color: _shellSubText,
+                        fontSize: 15,
+                        height: 1.2,
+                        fontWeight: FontWeight.w600,
+                        letterSpacing: 0,
+                      ),
+                    ),
+                    Flexible(
+                      child: Text(
+                        currentLine.label,
+                        overflow: TextOverflow.ellipsis,
+                        style: const TextStyle(
+                          color: Color(0xFF17233D),
+                          fontSize: 16,
+                          height: 1.2,
+                          fontWeight: FontWeight.w700,
+                          letterSpacing: 0,
+                        ),
+                      ),
+                    ),
+                    const SizedBox(width: 12),
+                    const Text(
+                      '切换',
+                      style: TextStyle(
+                        color: _shellAccent,
+                        fontSize: 15,
+                        height: 1.2,
+                        fontWeight: FontWeight.w700,
+                        letterSpacing: 0,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _LineSwitcherSheet extends StatelessWidget {
+  const _LineSwitcherSheet({
+    required this.lines,
+    required this.currentIndex,
+    required this.onSelect,
+  });
+
+  final List<H5Line> lines;
+  final int currentIndex;
+  final ValueChanged<int> onSelect;
+
+  @override
+  Widget build(BuildContext context) {
+    final sheetHeight = MediaQuery.sizeOf(context).height * 0.58;
+    final maxHeight = sheetHeight > 420 ? 420.0 : sheetHeight;
+
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(20, 0, 20, 16),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          const Text(
+            '切换线路',
+            style: TextStyle(
+              color: Color(0xFF17233D),
+              fontSize: 18,
+              height: 1.2,
+              fontWeight: FontWeight.w700,
+              letterSpacing: 0,
+            ),
+          ),
+          const SizedBox(height: 14),
+          ConstrainedBox(
+            constraints: BoxConstraints(maxHeight: maxHeight),
+            child: ListView.separated(
+              shrinkWrap: true,
+              itemCount: lines.length,
+              separatorBuilder: (context, index) => const SizedBox(height: 10),
+              itemBuilder: (context, index) {
+                final line = lines[index];
+                final selected = index == currentIndex;
+
+                return _LineOptionTile(
+                  line: line,
+                  selected: selected,
+                  onTap: () => onSelect(index),
+                );
+              },
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _LineOptionTile extends StatelessWidget {
+  const _LineOptionTile({
+    required this.line,
+    required this.selected,
+    required this.onTap,
+  });
+
+  final H5Line line;
+  final bool selected;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      color: selected ? const Color(0xFFEFF7FF) : Colors.white,
+      borderRadius: BorderRadius.circular(8),
+      child: InkWell(
+        onTap: onTap,
+        borderRadius: BorderRadius.circular(8),
+        child: Container(
+          constraints: const BoxConstraints(minHeight: 64),
+          padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+          decoration: BoxDecoration(
+            borderRadius: BorderRadius.circular(8),
+            border: Border.all(
+              color: selected ? _shellAccent : const Color(0xFFE1EAF5),
+            ),
+          ),
+          child: Row(
+            children: [
+              Icon(
+                selected
+                    ? Icons.radio_button_checked_rounded
+                    : Icons.radio_button_unchecked_rounded,
+                color: selected ? _shellAccent : _shellSubText,
+                size: 22,
+              ),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    Text(
+                      line.label,
+                      maxLines: 1,
+                      overflow: TextOverflow.ellipsis,
+                      style: const TextStyle(
+                        color: Color(0xFF17233D),
+                        fontSize: 16,
+                        height: 1.2,
+                        fontWeight: FontWeight.w700,
+                        letterSpacing: 0,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      line.displayAddress,
+                      maxLines: 1,
+                      overflow: TextOverflow.ellipsis,
+                      style: const TextStyle(
+                        color: _shellSubText,
+                        fontSize: 12,
+                        height: 1.2,
+                        fontWeight: FontWeight.w500,
+                        letterSpacing: 0,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              const SizedBox(width: 8),
+              const Icon(
+                Icons.chevron_right_rounded,
+                color: _shellSubText,
+                size: 22,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
 class _ShellFallback extends StatelessWidget {
   const _ShellFallback({required this.progress});
 

test/widget_test.dart

@@ -30,6 +30,26 @@ void main() {
         isFalse);
   });
 
+  test('exposes configured H5 URLs as Flutter shell lines', () {
+    final lines = AppConfig.h5Lines;
+
+    expect(lines, isNotEmpty);
+    expect(lines.first.label, '线路1');
+    expect(lines.first.url, AppConfig.homeUrl(lineIndex: 0));
+    expect(Uri.parse(lines.first.url).host, 'h5-test.imharry.work');
+  });
+
+  test('falls back to the first H5 line for invalid line indexes', () {
+    expect(AppConfig.homeUrl(lineIndex: -1), AppConfig.h5Lines.first.url);
+    expect(AppConfig.homeUrl(lineIndex: 99), AppConfig.h5Lines.first.url);
+  });
+
+  test('matches runtime URLs back to their Flutter shell line', () {
+    final lineUrl = AppConfig.h5Lines.first.url;
+
+    expect(AppConfig.lineIndexForUrl('${lineUrl}login'), 0);
+  });
+
   test('refreshes an H5 route URL without adding branding to the URL', () {
     final uri = Uri.parse(
       AppConfig.withFreshShellParams(
@@ -48,6 +68,22 @@ void main() {
         isFalse);
   });
 
+  test('keeps independent non-legacy H5 hosts when removing shell params', () {
+    final uri = Uri.parse(
+      AppConfig.canonicalizeMainFrameUrl(
+        'https://line-two.example/login?shell_app_name=Old'
+        '&flutter_shell=1#shell_app_logo=old',
+      ),
+    );
+
+    expect(uri.host, 'line-two.example');
+    expect(uri.path, '/login');
+    expect(uri.queryParameters.containsKey('shell_app_name'), isFalse);
+    expect(uri.queryParameters.containsKey('flutter_shell'), isFalse);
+    expect(Uri.splitQueryString(uri.fragment).containsKey('shell_app_logo'),
+        isFalse);
+  });
+
   test('rewrites legacy H5 host main-frame URLs to the canonical host', () {
     final uri = Uri.parse(
       AppConfig.canonicalizeMainFrameUrl(