node.js - 如何编写 Firebase Cloud Messaging 函数来发送推送通知

Question

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Answer 1

您需要的是概述的数据库触发器 here .您可以编写如下函数:

exports.sendNotification = functions.database  
            .ref('/notification/{topicId}/messages/{messageId}')
            .onCreate((snapshot, context) => {


    const topicId  = context.params.topicId;
    const messageId = context.params.messageId;
    const summaryLabel = topicId +"-"messageId; 
    const receivedOn = Date.now();

    const payload = {

        data: {
            topicId: topicId,
            messageId: messageId,
            time: receivedOn
        },

        notification: {
            title: "Notification Title",
            body: summaryLabel,
            icon: '/img/blue_map_icon.png',
            click_action: `https://${process.env.GCLOUD_PROJECT}.firebaseapp.com`,
            sound: "default"
        }
    };

    const options = {
        priority: "high",
        timeToLive: 60 * 60 * 2
    }; 

    return admin.messaging().sendToTopic(topicId, payload, options);


});