我使用了一个angular $http拦截器来检查ajax请求是否返回401(未经身份验证)。 如果响应是401,则原始请求被排队,显示登录表单,并在成功登录后重试排队的请求。这已经可以使用$http工作,而angular拦截器的源代码如下:
define('common.service.security.interceptor', ['angular'], function() {
'use strict';
angular.module('common.service.security.interceptor', ['common.service.security.retryQueue'])
.factory('securityInterceptor', [
'$injector',
'$location',
'securityRetryQueue',
function($injector, $location, securityRetryQueue) {
return function(promise) {
var $http = $injector.get('$http');
// catch the erroneous requests
return promise.then(null, function(originalResponse){
if(originalResponse.status === 401){
promise = securityRetryQueue.pushRetryFn('Unauthorized', function retryRequest(){
return $injector.get('$http')(originalResponse.config);
});
}
return promise;
});
};
}
])
// register the interceptor to the angular http service. method)
.config(['$httpProvider', function($httpProvider) {
$httpProvider.responseInterceptors.push('securityInterceptor');
}]);});
我应该如何使用这个angular $http拦截器来发起breeze请求?
Breeze在文件"Breeze/Adapters/breeze.ajax.angular.js"中提供了对angular $http服务的封装。因此,第一个想法是告诉breeze去使用它:
breeze.config.initializeAdapterInstance("ajax", "angular", true);
调试angular.js时,发现breeze实际上使用了$http,但它没有执行上面注册的拦截器。在$http内部,有一个名为"reversedInterceptors"的数组,用于保存已注册的拦截器。我将这个数组记录到控制台中。如果我使用$http,则该数组的长度为1(如预期),但是当使用breeze进行请求时,该数组为空。
问题是,如何在breeze请求中使用此$http拦截器?
以下是由breeze提供的breeze.ajax.angular.js代码:
define('breeze.ajax.angular.module', ['breeze', 'angular'], function (breeze) {
'use strict';
/* jshint ignore:start */
var core = breeze.core;
var httpService;
var rootScope;
var ctor = function () {
this.name = "angular";
this.defaultSettings = {};
};
ctor.prototype.initialize = function () {
var ng = core.requireLib("angular");
if (ng) {
var $injector = ng.injector(['ng']);
$injector.invoke(['$http', '$rootScope',
function (xHttp, xRootScope) {
httpService = xHttp;
rootScope = xRootScope;
}]);
}
};
ctor.prototype.setHttp = function (http) {
httpService = http;
rootScope = null; // to suppress rootScope.digest
};
ctor.prototype.ajax = function (config) {
if (!httpService) {
throw new Error("Unable to locate angular for ajax adapter");
}
var ngConfig = {
method: config.type,
url: config.url,
dataType: config.dataType,
contentType: config.contentType,
crossDomain: config.crossDomain
}
if (config.params) {
// Hack: because of the way that Angular handles writing parameters out to the url.
// so this approach takes over the url param writing completely.
// See: http://victorblog.com/2012/12/20/make-angularjs-http-service-behave-like-jquery-ajax/
var delim = (ngConfig.url.indexOf("?") >= 0) ? "&" : "?";
ngConfig.url = ngConfig.url + delim + encodeParams(config.params);
}
if (config.data) {
ngConfig.data = config.data;
}
if (!core.isEmpty(this.defaultSettings)) {
var compositeConfig = core.extend({}, this.defaultSettings);
ngConfig = core.extend(compositeConfig, ngConfig);
}
httpService(ngConfig).success(function (data, status, headers, xconfig) {
// HACK: because $http returns a server side null as a string containing "null" - this is WRONG.
if (data === "null") data = null;
var httpResponse = {
data: data,
status: status,
getHeaders: headers,
config: config
};
config.success(httpResponse);
}).error(function (data, status, headers, xconfig) {
var httpResponse = {
data: data,
status: status,
getHeaders: headers,
config: config
};
config.error(httpResponse);
});
rootScope && rootScope.$digest();
};
function encodeParams(obj) {
var query = '';
var key, subValue, innerObj;
for (var name in obj) {
var value = obj[name];
if (value instanceof Array) {
for (var i = 0; i < value.length; ++i) {
subValue = value[i];
fullSubName = name + '[' + i + ']';
innerObj = {};
innerObj[fullSubName] = subValue;
query += encodeParams(innerObj) + '&';
}
} else if (value instanceof Object) {
for (var subName in value) {
subValue = value[subName];
fullSubName = name + '[' + subName + ']';
innerObj = {};
innerObj[fullSubName] = subValue;
query += encodeParams(innerObj) + '&';
}
} else if (value !== undefined) {
query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
}
}
return query.length ? query.substr(0, query.length - 1) : query;
}
breeze.config.registerAdapter("ajax", ctor);
breeze.config.initializeAdapterInstance("ajax", "angular", true);
/* jshint ignore:end */
});
setHttp
FTW。请查看我的回答。 - Ward