Http error handling

doc/Theming.md

@@ -181,3 +181,28 @@ entity.errorMessage(function (response) {
     return 'Global error: ' + response.status + '(' + response.data + ')';
 });
 ```
+## Customizing HTTP Error Messages
+If you want to override, patch or extend the way HTTP errors are handled by the ng-admin [Http Error Service](../src/javascripts/ng-admin/Main/component/provider/HttpErrorService.js) then you may use an [Angular decorator](https://docs.angularjs.org/guide/decorators), as per the below example:
+
+Create a decorator, HttpErrorDecorator.js
+```js
+// Change HTTP 403 error notification to display them as information
+// and not errors ('humane-flatty-info' instead of 'humane-flatty-error')
+export default function httpErrorDecorator($delegate, $translate, notification) {
+
+	function handle403Error(error){
+	  $translate('STATE_FORBIDDEN_ERROR', {message: error.data.message}).then(text => notification.log(text, {addnCls: 'humane-flatty-info'}));
+    throw error;
+	}
+
+	$delegate.handle403Error = handle403Error;
+
+	return $delegate;
+}
+
+httpErrorDecorator.$inject = ['$delegate', '$translate', 'notification'];
+```
+Bind the decorator to your application:
+```js
+myApp.decorator('httpErrorService',require('HttpErrorDecorator'));
+```

src/javascripts/ng-admin/Main/MainModule.js

@@ -8,6 +8,7 @@ var MainModule = angular.module('main', ['ui.router', 'restangular', 'pascalprec
 MainModule.controller('AppController', require('./component/controller/AppController'));
 MainModule.controller('DashboardController', require('./component/controller/DashboardController'));
 MainModule.provider('NgAdminConfiguration', require('./component/provider/NgAdminConfiguration'));
+MainModule.provider('httpErrorService', require('./component/provider/HttpErrorService'));
 
 MainModule.filter('orderElement', require('./component/filter/OrderElement'));
 MainModule.filter('stripTags', require('./component/filter/StripTags'));
@@ -19,5 +20,5 @@ MainModule.config(require('./config/http'));
 MainModule.config(require('./config/routing'));
 MainModule.config(require('./config/translate'));
 
-MainModule.run(require('./run/ErrorHandler'));
+MainModule.run(require('./run/HttpErrorHandler'));
 MainModule.run(require('./run/Loader'));

src/javascripts/ng-admin/Main/component/provider/HttpErrorService.js

@@ -0,0 +1,36 @@
+const httpErrorService = ($state, $translate, notification) => ({
+    handleError: function(event, toState, toParams, fromState, fromParams, error) {
+        switch (error.status) {
+            case 404:
+               this.handle404Error(event, error);
+               break;
+            case 403:
+               this.handle403Error(error);
+               break;
+            default:
+               this.handleDefaultError(error);
+               break;
+        }
+    },
+
+    handle404Error: function(event) {
+        event.preventDefault();
+        $state.go('ma-404');
+    },
+
+    handle403Error: function(error) {
+        $translate('STATE_FORBIDDEN_ERROR', { message: error.data.message }).then(this.displayError);
+        throw error;
+    },
+
+    handleDefaultError: function(error) {
+        $translate('STATE_CHANGE_ERROR', { message: error.data.message }).then(this.displayError);
+         throw error;
+     },
+
+    displayError: text => notification.log(text, { addnCls: 'humane-flatty-error' }),
+});
+
+httpErrorService.$inject = ['$state', '$translate', 'notification'];
+
+export default { $get: httpErrorService };

src/javascripts/ng-admin/Main/config/translate.js

@@ -38,6 +38,7 @@ export default function translate($translateProvider) {
       'NEXT': 'Next »',
       'DETAIL': 'Detail',
       'STATE_CHANGE_ERROR': 'State change error: {{ message }}',
+      'STATE_FORBIDDEN_ERROR': 'A server 403 error occured: {{ message }}',
       'NOT_FOUND': 'Not Found',
       'NOT_FOUND_DETAILS': 'The page you are looking for cannot be found. Take a break before trying again.',
     });

src/javascripts/ng-admin/Main/run/HttpErrorHandler.js

@@ -0,0 +1,7 @@
+export default function httpErrorHandler($rootScope, HttpErrorService) {
+    $rootScope.$on("$stateChangeError", function handleError(event, toState, toParams, fromState, fromParams, error) {
+    	HttpErrorService.handleError(event, toState, toParams, fromState, fromParams, error);
+    });
+}
+
+httpErrorHandler.$inject = ['$rootScope','httpErrorService'];

src/javascripts/test/unit/Main/component/provider/HttpErrorServiceTest.spec.js

@@ -0,0 +1,79 @@
+const HttpErrorService = require('../../../../../ng-admin/Main/component/provider/HttpErrorService');
+
+describe('Http Error Service', () => {
+    let $state;
+    let $translate;
+    let httpErrorService;
+    let notification;
+
+    angular.module('test_httpErrorService', [])
+        .service('$state', () => ({
+            go: jasmine.createSpy('$state.go'),
+        }))
+        .service('$translate', () => (
+            jasmine.createSpy('$translate').and.returnValue({ then: cb => cb('translated') })
+        ))
+        .service('notification', () => ({
+            log: jasmine.createSpy('notification.log'),
+        }))
+        .provider('HttpErrorService', HttpErrorService);
+
+    beforeEach(angular.mock.module('test_httpErrorService'));
+
+    beforeEach(inject(function (_$state_, _$translate_, _HttpErrorService_, _notification_) {
+        $state = _$state_;
+        $translate = _$translate_;
+        httpErrorService = _HttpErrorService_;
+        notification = _notification_;
+    }));
+
+    it('should redirect to `ma-404` state when receiving a 404 error', () => {
+        const event = {
+            preventDefault: jasmine.createSpy(),
+        };
+
+        const error = { status: 404 };
+        httpErrorService.handleError(event, '', '', '', '', error);
+
+        expect(event.preventDefault).toHaveBeenCalled();
+        expect($state.go).toHaveBeenCalledWith('ma-404');
+    });
+
+    it('should display a translated forbidden error notification in case of 403', () => {
+        const error = {
+            status: 403,
+            data: {
+                message: 'Forbidden access',
+            },
+        };
+
+        try {
+            httpErrorService.handleError('', '', '', '', '', error);
+            expect(true).toBe(false);
+        } catch (e) {
+            // should throw an exception in case of 403
+        }
+
+        expect($translate).toHaveBeenCalledWith('STATE_FORBIDDEN_ERROR', { message: 'Forbidden access' });
+        expect(notification.log).toHaveBeenCalledWith('translated', { addnCls: 'humane-flatty-error' });
+    });
+
+    it('should display generic translated error notification if neither 404 nor 403', () => {
+        const error = {
+            status: 500,
+            data: {
+              message: 'Unknown error',
+            }
+        };
+
+        try {
+            httpErrorService.handleError('', '', '', '', '', error);
+            expect(true).toBe(false);
+        } catch (e) {
+            // should throw an exception in case of 500
+        }
+
+        expect($translate).toHaveBeenCalledWith('STATE_CHANGE_ERROR', { message: 'Unknown error' });
+        expect(notification.log).toHaveBeenCalledWith('translated', { addnCls: 'humane-flatty-error' });
+    });
+});