這是另一種可能的解決方案，使用或的resolve屬性。示例：$stateProvider$routeProvider$stateProvider
.config(["$stateProvider", function ($stateProvider) {
$stateProvider .state("forbidden", {
/* ... */
})
.state("signIn", {
/* ... */
resolve: {
access: ["Access", function (Access) { return Access.isAnonymous(); }],
}
})
.state("home", {
/* ... */
resolve: {
access: ["Access", function (Access) { return Access.isAuthenticated(); }],
}
})
.state("admin", {
/* ... */
resolve: {
access: ["Access", function (Access) { return Access.hasRole("ROLE_ADMIN"); }],
}
});}])Access 根據(jù)當前用戶權(quán)限解析或拒絕承諾：
.factory("Access", ["$q", "UserProfile", function ($q, UserProfile) {
var Access = {
OK: 200,
// "we don't know who you are, so we can't say if you're authorized to access
// this resource or not yet, please sign in first"
UNAUTHORIZED: 401,
// "we know who you are, and your profile does not allow you to access this resource"
FORBIDDEN: 403,
hasRole: function (role) {
return UserProfile.then(function (userProfile) {
if (userProfile.$hasRole(role)) {
return Access.OK;
} else if (userProfile.$isAnonymous()) {
return $q.reject(Access.UNAUTHORIZED);
} else {
return $q.reject(Access.FORBIDDEN);
}
});
},
hasAnyRole: function (roles) {
return UserProfile.then(function (userProfile) {
if (userProfile.$hasAnyRole(roles)) {
return Access.OK;
} else if (userProfile.$isAnonymous()) {
return $q.reject(Access.UNAUTHORIZED);
} else {
return $q.reject(Access.FORBIDDEN);
}
});
},
isAnonymous: function () {
return UserProfile.then(function (userProfile) {
if (userProfile.$isAnonymous()) {
return Access.OK;
} else {
return $q.reject(Access.FORBIDDEN);
}
});
},
isAuthenticated: function () {
return UserProfile.then(function (userProfile) {
if (userProfile.$isAuthenticated()) {
return Access.OK;
} else {
return $q.reject(Access.UNAUTHORIZED);
}
});
}
};
return Access;}])UserProfile將當前用戶的屬性，并執(zhí)行$hasRole，$hasAnyRole，$isAnonymous和$isAuthenticated方法的邏輯（加上一個$refresh方法，稍后解釋）：
.factory("UserProfile", ["Auth", function (Auth) {
var userProfile = {};
var clearUserProfile = function () {
for (var prop in userProfile) {
if (userProfile.hasOwnProperty(prop)) {
delete userProfile[prop];
}
}
};
var fetchUserProfile = function () {
return Auth.getProfile().then(function (response) {
clearUserProfile();
return angular.extend(userProfile, response.data, {
$refresh: fetchUserProfile,
$hasRole: function (role) {
return userProfile.roles.indexOf(role) >= 0;
},
$hasAnyRole: function (roles) {
return !!userProfile.roles.filter(function (role) {
return roles.indexOf(role) >= 0;
}).length;
},
$isAnonymous: function () {
return userProfile.anonymous;
},
$isAuthenticated: function () {
return !userProfile.anonymous;
}
});
});
};
return fetchUserProfile();}])Auth 負責(zé)請求服務(wù)器，知道用戶配置文件（例如鏈接到附加到請求的訪問令牌）：
.service("Auth", ["$http", function ($http) {
this.getProfile = function () {
return $http.get("api/auth");
};}])在請求時，服務(wù)器應(yīng)返回此類JSON對象GET api/auth：
{
"name": "John Doe", // plus any other user information
"roles": ["ROLE_ADMIN", "ROLE_USER"], // or any other role (or no role at all, i.e. an empty array)
"anonymous": false // or true}最后，當Access拒絕承諾時，如果使用ui.router，$stateChangeError則會觸發(fā)該事件：
.run(["$rootScope", "Access", "$state", "$log", function ($rootScope, Access, $state, $log) {
$rootScope.$on("$stateChangeError", function (event, toState, toParams, fromState, fromParams, error) {
switch (error) {
case Access.UNAUTHORIZED:
$state.go("signIn");
break;
case Access.FORBIDDEN:
$state.go("forbidden");
break;
default:
$log.warn("$stateChangeError event catched");
break;
}
});}])如果使用ngRoute，$routeChangeError將觸發(fā)該事件：
.run(["$rootScope", "Access", "$location", "$log", function ($rootScope, Access, $location, $log) {
$rootScope.$on("$routeChangeError", function (event, current, previous, rejection) {
switch (rejection) {
case Access.UNAUTHORIZED:
$location.path("/signin");
break;
case Access.FORBIDDEN:
$location.path("/forbidden");
break;
default:
$log.warn("$stateChangeError event catched");
break;
}
});}])
也可以在控制器中訪問用戶配置文件：
.state("home", {
/* ... */
controller: "HomeController",
resolve: {
userProfile: "UserProfile"
}})UserProfile然后包含服務(wù)器在請求時返回的屬性GET api/auth：
.controller("HomeController", ["$scope", "userProfile", function ($scope, userProfile) {
$scope.title = "Hello " + userProfile.name; // "Hello John Doe" in the example}])
UserProfile需要在用戶登錄或注銷時刷新，以便Access可以使用新的用戶配置文件處理路由。您可以重新加載整個頁面，也可以調(diào)用UserProfile.$refresh()。登錄時的示例：
.service("Auth", ["$http", function ($http) {
/* ... */
this.signIn = function (credentials) {
return $http.post("api/auth", credentials).then(function (response) {
// authentication succeeded, store the response access token somewhere (if any)
});
};}]).state("signIn", {
/* ... */
controller: "SignInController",
resolve: {
/* ... */
userProfile: "UserProfile"
}}).controller("SignInController", ["$scope", "$state", "Auth", "userProfile", function ($scope, $state, Auth, userProfile) {
$scope.signIn = function () {
Auth.signIn($scope.credentials).then(function () {
// user successfully authenticated, refresh UserProfile
return userProfile.$refresh();
}).then(function () {
// UserProfile is refreshed, redirect user somewhere
$state.go("home");
});
};}])
