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angularjs - 如何将 gmail api 正确加载到 angular 2 应用程序

转载 作者:行者123 更新时间:2023-12-05 07:43:55 31 4
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我是 Angular 2 的新手,所以我想详细解释一下这个要求。我构建的应用程序有一个登录页面 (/login) 和设置页面 (/settings)。

当用户访问登录页面时,gapi var 被正确初始化,然后用户登录到应用程序。

一旦用户进入,他就有了设置页面。当用户刷新页面时,问题就开始了,当发生这种情况时,gapi var 不再被识别并变得未定义。我的想法是 gapi 库没有加载,因此它失败了。

我在app index.html 文件中放置了以下代码

<script type="text/javascript">
// Client ID and API key from the Developer Console
var CLIENT_ID = '***.apps.googleusercontent.com';

// Array of API discovery doc URLs for APIs used by the quickstart
var DISCOVERY_DOCS = ["https://www.googleapis.com/discovery/v1/apis/gmail/v1/rest"];

// Authorization scopes required by the API; multiple scopes can be
// included, separated by spaces.
var SCOPES = 'https://www.googleapis.com/auth/gmail.readonly';

/**
* On load, called to load the auth2 library and API client library.
*/
function handleClientLoad() {
console.log("handleClientLoad")
gapi.load('client:auth2', initClient);
}

/**
* Initializes the API client library and sets up sign-in state
* listeners.
*/
function initClient() {
gapi.client.init({
discoveryDocs: DISCOVERY_DOCS,
clientId: CLIENT_ID,
scope: SCOPES
}).then(function () {
// Listen for sign-in state changes.
console.log("client init");
gapi.auth2.getAuthInstance().isSignedIn.listen();

// Handle the initial sign-in state.
//updateSigninStatus(gapi.auth2.getAuthInstance().isSignedIn.get());

});
}


</script>

<script async defer src="https://apis.google.com/js/api.js"
onload=this.onload=function(){};handleClientLoad();
onreadystatechange="if (this.readyState === 'complete') this.onload()";>

</script>

总结一下如何正确加载 gapi 模块来处理上述刷新场景?

我尝试使用来自 Best way to wait for 3rd-party JS library to finish initializing within Angular 2 service? 的解决方案然而它没有用,gapi 仍然是未定义的。

最佳答案

我所做的是创建一个自定义 GoogleService,它负责在 Angular 应用程序中初始化 GAPI 客户端。我的应用不是直接与 GAPI 客户端交互,而是与 GoogleService 交互。

例如(使用 Angular 9.x)

import { Injectable } from '@angular/core';
import { environment } from '../environments/environment';

@Injectable({
providedIn: 'root',
})
export class GoogleService {
private gapiAuth?: Promise<gapi.auth2.GoogleAuth>;

constructor() {
// Chrome lets us load the SDK on demand, but firefox will block the popup
// when loaded on demand. If we preload in the constructor,
// then firefox won't block the popup.
this.googleSDK();
}

async signinGoogle() {
const authClient = (await this.googleSDK()) as gapi.auth2.GoogleAuth;
const googleUser = await authClient.signIn();
const profile = googleUser.getBasicProfile();

return {
type: 'GOOGLE',
token: googleUser.getAuthResponse().id_token as string,
uid: profile.getId() as string,
firstName: profile.getGivenName() as string,
lastName: profile.getFamilyName() as string,
photoUrl: profile.getImageUrl() as string,
emailAddress: profile.getEmail() as string,
};
}

async grantOfflineAccess() {
const authClient: gapi.auth2.GoogleAuth = (await this.googleSDK()) as any;

try {
const { code } = await authClient.grantOfflineAccess();

return code;
} catch (e) {
// access was denied
return null;
}
}

// annoyingly there is some sort of bug with typescript or the `gapi.auth2`
// typings that seems to prohibit awaiting a promise of type `Promise<gapi.auth2.GoogleAuth>`
// https://stackoverflow.com/questions/54299128/type-is-referenced-directly-or-indirectly-in-the-fulfillment-callback-of-its-own
private googleSDK(): Promise<unknown> {
if (this.gapiAuth) return this.gapiAuth;

const script = document.createElement('script');
script.type = 'text/javascript';
script.async = true;
script.defer = true;
script.src = 'https://apis.google.com/js/api.js?onload=gapiClientLoaded';

this.gapiAuth = new Promise<void>((res, rej) => {
(window as any)['gapiClientLoaded'] = res;
script.onerror = rej;
})
.then(() => new Promise(res => gapi.load('client:auth2', res)))
.then(() =>
gapi.client.init({
apiKey: environment.google.apiKey,
clientId: environment.google.clientId,
discoveryDocs: environment.google.discoveryDocs,
scope: environment.google.scopes.join(' '),
}),
)
.catch(err => {
console.error('there was an error initializing the client', err);
return Promise.reject(err);
})
.then(() => gapi.auth2.getAuthInstance());

document.body.appendChild(script);

return this.gapiAuth;
}
}

关于angularjs - 如何将 gmail api 正确加载到 angular 2 应用程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43254549/

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