我想将APN发送到我的应用程序。我已成功生成通知并将其发送到我的应用。
我的问题是，服务器在块中频繁发送通知。我猜我的脚本算法有问题。
我想做什么：
我希望每次在帖子中发表评论时都会将通知发送到设备。我想从Firebase数据库中明确地获取用户名和注释。
我正在附加服务器脚本：
var firebase = require("firebase");
var once = require("once");
const apn = require('apn');
var config = {
apiKey: "<key>",
authDomain: "<domain>",
databaseURL: "<url>",
projectId: "<id>",
storageBucket: "<bucket>",
messagingSenderId: "<ID>"
};
firebase.initializeApp(config);
let options = {
token: {
key: "<p8 file>",
keyId: "<key>",
teamId: "<team>"
},
production: false
};
let apnProvider = new apn.Provider(options);
// Prepare the notifications
let notification = new apn.Notification();
notification.expiry = Math.floor(Date.now() / 1000) + 24 * 3600; // will expire in 24 hours from now
notification.badge = 3;
notification.sound = "default";
notification.topic = "<My bundle ID>";
notification.payload = {'messageFrom': 'me'};
var author;
var dtoken;
var spotter;
var comment;
var database = firebase.database();
var postref = database.ref("posts").orderByChild("gen_notif").equalTo("yes").on("value", function (snapshot) {
var key;
var deviceToken;
console.log("-------------------Post Ids----------------------")
snapshot.forEach(function (childSnapshot) {
key = childSnapshot.key
author = childSnapshot.val()["author"];
console.log(key)
var newref = database.ref("posts/" + childSnapshot.key + "/comment").on('child_added', function(snapy){
console.log(snapy.val())
console.log("-----------------comment Keys----------------------")
snapy.forEach(function(s){
var spotuserkey = s.key
comment = s.val()
console.log(spotuserkey)
var spotuser = database.ref("users/"+ spotuserkey +"/credentials/name").on('value', function(spottersnap){
console.log("-----------------User Key-----------------------")
spotuser = spottersnap.val()
console.log(spotuser)
var tokenref = database.ref("device/"+author+"/token").once('value', function(snap){
console.log("-----------------device token---------------------")
deviceToken = snap.val()
console.log(deviceToken)
notification.alert = {
"title": "You Got Spotted",
"body": spotuser + " Spot you " + comment
};
apnProvider.send(notification, deviceToken).then( result => {
console.log(result["failed"][0]["response"]);
});
})//tokenref end
})//spotteref end
}); //snapy forEach end
})//newref end
}); //snapshot forEach end
}); //postref end
apnProvider.shutdown();
答案 0 :(得分：1)
要初始化您的应用，我认为最好使用您可以通过Firebase控制台下载的serviceAccountKey文件，而不是直接在代码中写入您的密钥：
const functions = require('firebase-functions');
var admin = require('firebase-admin');
var serviceAccount = require("./serviceAccountKey.json");
admin.initializeApp({
credential: admin.credential.cert(serviceAccount),
databaseURL: "YOUR_DATABASE_URL_GOES_HERE"
});
当然，您需要在此处替换自己的数据库URL，并确保serviceAccountKey.json文件位于函数文件夹中。
但是我认为您需要稍微重构一下数据库，以便更容易在服务器端检索您的ID，例如它可能看起来像这样：
root/
| ....
|
|
|___ posts/
| |___ postID
| |___ authorId : ...
| |___ caption : ...
| |___ comments
| |___ commentID
| |___ senderId: ...
| |___ text: ...
| ...
|
|
|___ users/
| |___ userID
| |___ name : ...
| |___ email : ...
| |___ notificationTokens
| |___ token1 : true
| |___ token2 : true
| ...
然后，只要注释节点中有新的写入事件，您就可以创建使用该函数在通知节点内编写通知对象：
exports.createPostCommentedNotification = functions.database.ref('/posts/{postID}/comments/{commentID}').onWrite(event => {
const data = event.data;
if(data == undefined || !data.val()) { return; }
const postID = event.params.postID;
const commentID = event.params.commentID;
const getCommentSender = admin.database().ref(`/posts/${postID}/comments/${commentID}`).once('value');
const getPostAuthor = admin.database().ref(`/posts/${postID}`).once('value');
return Promise.all([getCommentSender, getPostAuthor]).then(results => {
const commentSenderData = results[0];
const postAuthorData = results[1];
const commentSenderId = commentSenderData.val().senderId;
const postAuthorId = postAuthorData.val().authorId;
if(commentSenderId == postAuthorId) {
return;
};
const notificationID = admin.database().ref().push().key;
const timestamp = Date.now()
const getSenderProfilePromise = admin.auth().getUser(commentSenderId);
return Promise.all([getSenderProfilePromise]).then(results => {
// Note that when you create a user account you would need to set the displayName of the user using the updateProfile() method, otherwise you would need to retrieve the senderName in a different way:)
const senderData = results[0]
const senderName = senderData.providerData[0].displayName
var notificationData = {
senderName: senderName,
notificationTimestamp: timestamp
};
var updates = {};
updates['/notifications/' + postAuthorId + '/' + notificationID] = notificationData;
admin.database().ref().update(updates);
});
});
});
然后，只要有一个新的通知对象添加到通知节点，您就会创建另一个函数来使用您的用户令牌实际发送推送通知，如下所示：
exports.sendPushNotifications = functions.database.ref('/notifications/{receiverId}/{notificationId}').onWrite(event => {
const data = event.data;
if(data == undefined || !data.val()) { return; }
const receiverId = event.params.receiverId;
const notificationId = event.params.notificationId;
const getDeviceTokensPromise = admin.database().ref(`/users/${receiverId}/notificationTokens`).once('value');
const getMessageContentPromise = admin.database().ref(`/notifications/${receiverId}/${notificationId}/notificationType`).once('value');
const getSenderPromise = admin.database().ref(`/notifications/${receiverId}/${notificationId}/senderName`).once('value');
return Promise.all([getDeviceTokensPromise, getSenderPromise]).then(results => {
const tokensSnapshot = results[0];
const senderSnapshot = results[1];
const sender = senderSnapshot.val()
if (!tokensSnapshot.hasChildren()) {
return console.log('There are no notification tokens to send to.');
}
const payload = {
notification: {
title: `${sender}`,
body: 'Someone commented on your post',
badge: '1'
}
};
var options = {
priority: "high",
timeToLive: 60 * 60 * 24,
mutable_content : true,
content_available : true,
category : 'reminder'
};
const tokens = Object.keys(tokensSnapshot.val());
return admin.messaging().sendToDevice(tokens, payload, options).then(response => {
const tokensToRemove = [];
response.results.forEach((result, index) => {
const error = result.error;
if (error) {
console.error('Failure sending notification to', tokens[index], error);
if (error.code === 'messaging/invalid-registration-token' ||
error.code === 'messaging/registration-token-not-registered') {
tokensToRemove.push(tokensSnapshot.ref.child(tokens[index]).remove());
}
}
});
return Promise.all(tokensToRemove);
});
});
});
如果您有任何问题，请告诉我！