Can we address certain data before the $stateChangeStart event is triggered?

Question

Can we address certain data before the $stateChangeStart event is triggered?

I have been working on creating a custom Role-Permissions system that I want to set up during the initial root state resolve:

 $stateProvider
  .state('common', {
    resolve:{
      user: function(AclService, UserService) {
        UserService.getCurrent().then((currentUser) => {
          AclService.initialize(currentUser);
        });
      }
    }
  })

and verify permissions every time there is a $stateChangeStart:

$rootScope.$on('$stateChangeStart', ($event, toState) => AclService.interceptStateChange($event, toState));

However, I encountered an issue where the first $stateChangeStart event was triggered before the resolve took place, hence the permissions were not initialized yet.

What steps would you recommend in addressing this specific situation?

javascript angularjs angular-ui-router acl

Answer 1

Answer №1

Incorporating this logic within the run function of your application is a viable approach. Below is a condensed example demonstrating how to preload authentication data.

(function() {

    "use strict";

    angular
        .module("myModule", [ //dependencies here...]);

    angular
        .module("myModule")
        .run(run);

    run.$inject = ["$rootScope", "$state", "authService"];

function run($rootScope, $state, authService) {

    authService.fillAuthData(); //loading auth data upfront...

    $rootScope.$on("$stateChangeStart", function (event, toState, toParams, fromState, fromParams) {

        var isPublic = (toState.data && toState.data.isPublic && toState.data.isPublic === true);
        var requiredRole = (toState.data && toState.data.requiredRole) ? toState.data.requiredRole : null;
        var authorized = isPublic || authService.isUserInRole(requiredRole);

        if (authService.authentication.isAuth || isPublic) {

            //redirect user to unauthorized page if they lack necessary permissions for the requested page
            if (!authorized) {
                event.preventDefault();
                $state.go("unauthorized");
                return;
            }

        } else {

            event.preventDefault();
            $state.go("login");
            return;
        }
    });
}

})();

An example state definition could appear as follows:

.state("someState", {
    url: "/someState",
    templateUrl: "my/folder/file.html",
    data: {
        pageTitle: "Some Page",
        isPublic: false,
        requiredRole: "Admin"
    }
})

Answer 2

Incorporating this logic within the run function of your application is a viable approach. Below is a condensed example demonstrating how to preload authentication data.

(function() {

    "use strict";

    angular
        .module("myModule", [ //dependencies here...]);

    angular
        .module("myModule")
        .run(run);

    run.$inject = ["$rootScope", "$state", "authService"];

function run($rootScope, $state, authService) {

    authService.fillAuthData(); //loading auth data upfront...

    $rootScope.$on("$stateChangeStart", function (event, toState, toParams, fromState, fromParams) {

        var isPublic = (toState.data && toState.data.isPublic && toState.data.isPublic === true);
        var requiredRole = (toState.data && toState.data.requiredRole) ? toState.data.requiredRole : null;
        var authorized = isPublic || authService.isUserInRole(requiredRole);

        if (authService.authentication.isAuth || isPublic) {

            //redirect user to unauthorized page if they lack necessary permissions for the requested page
            if (!authorized) {
                event.preventDefault();
                $state.go("unauthorized");
                return;
            }

        } else {

            event.preventDefault();
            $state.go("login");
            return;
        }
    });
}

})();

An example state definition could appear as follows:

.state("someState", {
    url: "/someState",
    templateUrl: "my/folder/file.html",
    data: {
        pageTitle: "Some Page",
        isPublic: false,
        requiredRole: "Admin"
    }
})

Answer 3

Answer №2

Avoid incorporating authentication logic within state resolves. A more effective approach is to create a listener for the $stateChangeStart event within the angular.run function:

angular.module('yourModule', [])
    .run(['$rootScope', 'principal', '$state', function ($rootScope, principal, $state) {
        var firstOpen = true;
        $rootScope.$on('$stateChangeStart', function(event, toState, toParams) {
            if (!principal.isAuthenticated() && firstOpen) {
                firstOpen = false;
                event.preventDefault();
                principal.checkAuthentication().then(function() {
                    $state.go(toState, toParams);
                });
            } else if (principal.isAuthenticated() && toState.name === 'login') {
                event.preventDefault();
                // You can add custom actions here, such as redirecting to the main page
            }
        });
    }
]);

Answer 4

Avoid incorporating authentication logic within state resolves. A more effective approach is to create a listener for the $stateChangeStart event within the angular.run function:

angular.module('yourModule', [])
    .run(['$rootScope', 'principal', '$state', function ($rootScope, principal, $state) {
        var firstOpen = true;
        $rootScope.$on('$stateChangeStart', function(event, toState, toParams) {
            if (!principal.isAuthenticated() && firstOpen) {
                firstOpen = false;
                event.preventDefault();
                principal.checkAuthentication().then(function() {
                    $state.go(toState, toParams);
                });
            } else if (principal.isAuthenticated() && toState.name === 'login') {
                event.preventDefault();
                // You can add custom actions here, such as redirecting to the main page
            }
        });
    }
]);

Can we address certain data before the $stateChangeStart event is triggered?

Answer №1

Answer №2

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