react-native - 如何通过 Expo 获取 FB Access Token
问题描述
我正在构建需要在许多地方发出 Facebook Graph API 请求的应用程序。但我不知道如何检索访问令牌然后发出 Graph API 请求。
我正在使用 Expo、React Native 和 Firebase。我想在不安装 Xcode 和/或 Android Studio 的情况下做到这一点。
登录工作正常。我的代码如下:
async loginWithFacebook() {
try {
const {
type,
token,
expires,
permissions,
declinedPermissions,
} = await Expo.Facebook.logInWithReadPermissionsAsync('<APP_ID', {
permissions: ['email', 'public_profile'],
});
if (type === 'success') {
const credential = f.auth.FacebookAuthProvider.credential(token)
f.auth().signInAndRetrieveDataWithCredential(credential).catch((error) => {
console.log(error)
})
var that = this;
const response = await fetch(`https://graph.facebook.com/me/?fields=id,name&access_token=${token}`);
const userInfo = await response.json();
this.setState({userInfo});
this.setState({
dataSource: userInfo.data,
isLoading: false,
});
} else {
// type === 'cancel'
}
} catch ({ message }) {
alert(`Facebook Login Error: ${message}`);
}
}
有人可以帮助我并给我一些提示,我可以在我的应用程序中的任何地方使用访问令牌吗?先感谢您
解决方案
获取token
并将其保存到AsyncStorage
那么您编写的代码基本上是正确的。您已成功获得访问令牌。当您提出Expo.Facebook.logInWithReadPermissionsAsync
请求时,它会返回给您。一旦你有了它,你就可以将它存储在 Redux 或 AsyncStorage 中以供以后使用。
logIn = async () => {
let appID = '123456789012345' // <- you'll need to add your own appID here
try {
const {
type,
token, // <- this is your access token
expires,
permissions,
declinedPermissions,
} = await Expo.Facebook.logInWithReadPermissionsAsync(appID, { permissions: ['public_profile', 'email'], });
if (type === 'success') {
// Get the user's name using Facebook's Graph API
const response = await fetch(`https://graph.facebook.com/me/?fields=id,name&access_token=${token}`); //<- use the token you got in your request
const userInfo = await response.json();
alert(userInfo.name);
// you could now save the token in AsyncStorage, Redux or leave it in state
await AsyncStorage.setItem('token', token); // <- save the token in AsyncStorage for later use
} else {
// type === 'cancel'
}
} catch ({ message }) {
alert(`Facebook Login Error: ${message}`);
}
}
app.json
还要记住将以下内容添加到您的app.json
中,显然用您自己的值替换。您可以通过在 Facebook 注册您的应用程序来获得这些信息,您可以在此处查看更多信息https://docs.expo.io/versions/latest/sdk/facebook/#registering-your-app-with-facebook
{
"expo": {
"facebookScheme": "fb123456789012345",
"facebookAppId": "123456789012345", // <- this is the same appID that you require above when making your initial request.
"facebookDisplayName": "you_re_facebook_app_name",
...
}
}
从token
_AsyncStorage
然后,如果您想稍后提出另一个请求,您可以使用与此类似的功能,然后从中token
取出,AsyncStorage
然后使用它来提出您的请求。
makeGraphRequest = async () => {
try {
let token = await AsyncStorage.getItem('token'); // <- get the token from AsyncStorage
const response = await fetch(`https://graph.facebook.com/me/?fields=id,name&access_token=${token}`); // <- use the token for making the graphQL request
const userInfo = await response.json();
alert(userInfo.name)
} catch (err) {
alert(err.message)
}
}
小吃
我会做一个零食来向你展示这个工作但是,零食不允许编辑app.json
文件(据我所知)。所以这里有一些你可以替换的东西,App.js
然后如果你将你的 appID 等添加到app.json
它应该可以工作。
import React from 'react';
import { AsyncStorage, Text, View, StyleSheet, SafeAreaView, Button } from 'react-native';
export default class App extends React.Component {
logIn = async () => {
let appID = '123456789012345' // <- you'll need to add your own appID here
try {
const {
type,
token, // <- this is your access token
expires,
permissions,
declinedPermissions,
} = await Expo.Facebook.logInWithReadPermissionsAsync(appID, {
permissions: ['public_profile', 'email'],
});
if (type === 'success') {
// Get the user's name using Facebook's Graph API
const response = await fetch(`https://graph.facebook.com/me/?fields=id,name&access_token=${token}`); //<- use the token you got in your request
const userInfo = await response.json();
console.log(userInfo);
alert(userInfo.name);
// you could now save the token in AsyncStorage, Redux or leave it in state
await AsyncStorage.setItem('token', token); // <- save the token in AsyncStorage for later use
} else {
// type === 'cancel'
}
} catch ({ message }) {
alert(`Facebook Login Error: ${message}`);
}
}
makeGraphRequest = async () => {
try {
let token = await AsyncStorage.getItem('token');
// Get the user's name using Facebook's Graph API
const response = await fetch(`https://graph.facebook.com/me/?fields=id,name&access_token=${token}`);
const userInfo = await response.json();
alert(userInfo.name)
} catch (err) {
alert(err.message)
}
}
render() {
return (
<View style={styles.container}>
<Button title={'Sign in to Facebook'} onPress={this.logIn} />
<Button title={'Make GraphQL Request'} onPress={this.makeGraphRequest} />
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'white'
}
});