angularjs - 使用 Google API 将变量从 AngularJS 服务传递到 Controller ？

Question

我正在尝试使用 Google API Javascript 客户端在我的应用上使用 Google 登录，然后访问用户的电子邮件地址和联系人。我正在将它与 AngularJS 结合起来，并且我已经读到最好将它作为自己的服务。

这是目前服务的代码:

.service('googleLogin', ['$http', '$rootScope', function ($http, $rootScope) {
            var clientId = '{MY CLIENT KEY}',
                apiKey = '{MY API KEY}',
                scopes = 'https://www.googleapis.com/auth/userinfo.email https://www.google.com/m8/feeds',
                domain = '{MY COMPANY DOMAIN}';

            this.handleClientLoad = function () {
                // Step 2: Reference the API key
                gapi.client.setApiKey(apiKey);
                gapi.auth.init(function () { });
                window.setTimeout(checkAuth, 1);
            };

            this.checkAuth = function() {
                gapi.auth.authorize({ client_id: clientId, scope: scopes, immediate: true, hd: domain }, this.handleAuthResult );
            };

            this.handleAuthResult = function(authResult) {
                if (authResult && !authResult.error) {
                    gapi.client.load('oauth2', 'v2', function () {
                        var request = gapi.client.oauth2.userinfo.get();
                        request.execute(function (resp) {
                            console.log(userEmail);
                        });
                    });
                }
            };

            this.handleAuthClick = function (event) {
                // Step 3: get authorization to use private data
                gapi.auth.authorize({ client_id: clientId, scope: scopes, immediate: false, hd: domain }, this.handleAuthResult );
                return false;
            };

        }]);

然后我从 Controller 调用它:

        $scope.login = function () {
            googleLogin.handleAuthClick();
        };

哪个有效，并且 API 被正确调用。但是现在，我不确定如何通过服务从 API 获取数据。我需要获取用户的电子邮件地址，以及他们的联系人列表。我不能只使用单独的 get 函数来返回这些值，因为似乎 API 客户端调用必须在链中进行(例如，handleAuthResult 被称为handleAuthClick 中的参数)。

我也尝试将它们设置为 $rootScope 值，或者只是普通变量，但是一旦 Controller 调用它们，它们总是以 undefined 的形式出现。

我的处理方法正确吗？如何从 Google API 到 Service 再到 Controller 获取这些变量？谢谢。

Answer 1

我最终使用了来自 angularJS 的 promise/defer 实现，记录在 here .

这是最后的服务:

.service('googleLogin', ['$http', '$rootScope', '$q', function ($http, $rootScope, $q) {
            var clientId = '{MY CLIENT ID}',
                apiKey = '{MY API KEY}',
                scopes = 'https://www.googleapis.com/auth/userinfo.email https://www.google.com/m8/feeds',
                domain = '{MY COMPANY DOMAIN}',
                userEmail,
                deferred = $q.defer();

            this.login = function () {
                gapi.auth.authorize({ client_id: clientId, scope: scopes, immediate: false, hd: domain }, this.handleAuthResult);

                return deferred.promise;
            }

            this.handleClientLoad = function () {
                gapi.client.setApiKey(apiKey);
                gapi.auth.init(function () { });
                window.setTimeout(checkAuth, 1);
            };

            this.checkAuth = function() {
                gapi.auth.authorize({ client_id: clientId, scope: scopes, immediate: true, hd: domain }, this.handleAuthResult );
            };

            this.handleAuthResult = function(authResult) {
                if (authResult && !authResult.error) {
                    var data = {};
                    gapi.client.load('oauth2', 'v2', function () {
                        var request = gapi.client.oauth2.userinfo.get();
                        request.execute(function (resp) {
                            $rootScope.$apply(function () {
                                data.email = resp.email;
                            });
                        });
                    });
                    deferred.resolve(data);
                } else {
                    deferred.reject('error');
                }
            };

            this.handleAuthClick = function (event) {
                gapi.auth.authorize({ client_id: clientId, scope: scopes, immediate: false, hd: domain }, this.handleAuthResult );
                return false;
            };

        }]);

以及它当前在 Controller 中的调用方式:

var promise = googleLogin.login();
                promise.then(function (data) {
                    console.log(data.email);
                }, function (reason) {
                    console.log('Failed: ' + reason);
                });