Flutter如何完成路由拦截,实现权限管理

//完整路由表
static final routeTable = {
  loginPath: Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return LoginPage();
  }),
  dynamicDetailPath: Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return DynamicDetailPage(params['id'][0]);
  }),
  splashPath: Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return Splash();
  }),
  transitionPath: Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return TransitionPage();
  }),
  homePath: Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return AppHomePage();
  }),
};

//未授权页面处理器
static final permissionDeniedHandler =
    Handler(handlerFunc: (BuildContext context, Map<String, dynamic> params) {
  return PermissionDenied();
});

//定义路由
//添加路由时，将路由路径与白名单进行比对
//若不在白名单内，则使用未授权路由处理器
static void defineRoutes({List<String> whiteList}) {
  routeTable.forEach((path, handler) {
    if (whiteList == null || whiteList.contains(path)) {
      router.define(path, handler: handler);
    } else {
      router.define(path,
          handler: permissionDeniedHandler,
          transitionType: TransitionType.material);
    }
  });

  router.notFoundHandler = Handler(
      handlerFunc: (BuildContext context, Map<String, dynamic> params) {
    return NotFound();
  });
}

/// Finds a defined [AppRoute] for the path value.
/// If no [AppRoute] definition was found
/// then function will return null.
AppRouteMatch? match(String path) {
  return _routeTree.matchRoute(path);
}

class AppRoute {
  String route;
  dynamic handler;
  TransitionType? transitionType;
  Duration? transitionDuration;
  RouteTransitionsBuilder? transitionBuilder;
  AppRoute(this.route, this.handler,
      {this.transitionType, this.transitionDuration, this.transitionBuilder});
}

import 'package:flutter/material.dart';
import 'package:fluro/fluro.dart';

class PermissionRouter extends FluroRouter {
  List<String> _whiteList;
  set whiteList(value) => _whiteList = value;

  String _permissionDeniedPath;
  set permissionDeniedPath(value) => _permissionDeniedPath = value;

  @override
  Future navigateTo(
    BuildContext context,
    String path, {
    bool replace = false,
    bool clearStack = false,
    bool maintainState = true,
    bool rootNavigator = false,
    TransitionType transition,
    Duration transitionDuration,
    transitionBuilder,
    RouteSettings routeSettings,
  }) {
    String pathToNavigate = path;
    AppRouteMatch routeMatched = this.match(path);
    String routePathMatched = routeMatched?.route?.route;
    if (routePathMatched != null) {
      //设置了白名单且当前路由不在白名单内，更改路由路径到授权被拒绝页面
      if (_whiteList != null && !_whiteList.contains(routePathMatched)) {
        pathToNavigate = _permissionDeniedPath;
      }
    }
    return super.navigateTo(context, pathToNavigate,
        replace: replace,
        clearStack: clearStack,
        maintainState: maintainState,
        rootNavigator: rootNavigator,
        transition: transition,
        transitionDuration: transitionDuration,
        transitionBuilder: transitionBuilder,
        routeSettings: routeSettings);
  }
}