AngularJS AOP 实例

　　AngularJS有种机制叫做拦截器（interceptor）,它是$http扩展点，类似ASP.NET MVC的过滤器filter机制，对每个$http请求的发送和接收过程进行过滤。

　　$httpProvider 中有一个 interceptors 数组，定义一个工厂服务，并添加到该数组中。

　module.config(['$httpProvider', function($httpProvider) {

　　　　$httpProvider.interceptors.push('myInterceptor');

　　}]);

　　定义factory,返回一个对象，有属性request，requestError，response，responseError属性，对每个请求及其进行统一处理，对每次请求都添加上身份认证信息，构造附加的请求地址前缀等，对响应如果有错误或异常，进行统一处理，或弹出对话框。

module.factory('myInterceptor',
['$q', '$log', '$injector', 'loginContext', 'eventAggregator', 'maintainUtil',
function ($q, $log, $injector, loginContext, eventAggregator, maintainUtil) {
    'use strict';

    var apiToken = loginContext.apiToken;
    var tokenType = loginContext.tokenType;
    var webApiHostUrl = loginContext.apiHost + "/api/v1";

    return {
        //token save to services for further usage
        tokenType: tokenType,
        apiToken: apiToken,
        webApiHostUrl: webApiHostUrl,

        // On request success
        request: function (config) {
            if (config.isWebApiRequest && !config.isPlugin) {
                config.url = (config.mkApiUrl || webApiHostUrl) + config.url;
                config.headers = config.headers || {};
                config.headers.Authorization = tokenType + ' ' + (config.mkToken || apiToken);
                var specificOfficeId = Mres.specificOfficeUtil.getOfficeId();
                if (specificOfficeId) {
                    config.headers["specific-office-id"] = specificOfficeId;
                }
            } else if (config.handleApiRequest) {
                config = config.handleApiRequest(config);
            }
            return config;
        },
        // On request failure
        requestError: function (rejection) {
            $log.error(rejection); // Contains the data about the error on the request.
            // Return the promise rejection.
            return $q.reject(rejection);
        },
        // On response failture
        responseError: function (response) {
            $log.error(response); // Contains the data about the error.
            if (response.status === 401) {
                //window.location = '/logoff';
                Mres.logOff();
            } else if (response.data) {
                if (response.data.name == 'MenantInactiveException') {

                    aresMaintainUtil.goToMenantInactivePage();
                }
                eventAggregator.publish(eventAggregator.events.ApiErrorHappened, response, 'myInterceptor');
            } else if (response.status === 0) {
                var isSaasApi = true;
                if (response.config && response.config.url.indexOf('//marketcenter') > -1) {
                    isSaasApi = false;
                }
                if (isSaasApi) {
                    aresMaintainUtil.ensureInMaintainMode().then(function (isInMaintainMode) {
                        if (isInMaintainMode) {
                            mresMaintainUtil.goToMaintainPage();
                        }
                    });
                }
            }
            // Return the promise rejection.
            return $q.reject(response);
        }
    };
}])

　　适用于对每次请求和响应附加统一功能或数据。