im/src/server/models/client/wechat.client.js

/**
 * 用户微信客户端。
 */
"use strict";

let RedisClient = require('../../repository/redis/redis.client');
let RedisModel = require('../redis.model');
let ObjectUtil = require("../../util/object.util.js");
let ModelUtil = require('../../util/model.util');
let WechatSDK = require('../../util/wechat.sdk');
let PatientRepo = require('../../repository/mysql/patient.repo');
let TopicRepo = require("../../repository/mysql/topics.repo.js");

let redisConn = RedisClient.redisClient().connection;
let clientCache = require('../socket.io/client.cache').clientCache();
let configFile = require('../../include/commons').CONFIG_FILE;
let config = require('../../resources/config/' + configFile);
let log = require("../../util/log.js");
let https = require('https');
let async = require('async');

const CONTENT_TYPES = require('../../include/commons').CONTENT_TYPES;
const REDIS_KEYS = require('../../include/commons').REDIS_KEYS;

class WechatClient extends RedisModel {
    constructor() {
        super();
    }

    /**
     * 取得用户微信端状态。若Redis中找不到，则从MySQL中查找。
     *
     * @param userId
     * @param handler
     */
    static getWechatStatus(userId, handler) {
        redisConn.hgetallAsync(RedisModel.makeRedisKey(REDIS_KEYS.UserWechatStatus, userId))
            .then(function (status) {
                if (status == null) {
                    PatientRepo.findWechatOpenId(userId, handler);
                } else {
                    handler(null, {openid: status.openid});
                }
            })
            .catch(function (err) {
                handler(err, null);
            });
    }

    /**
     * 向微信端用户发送消息。若用户微信端在线，通过Web Socket推送给患者，如果不在线则通过微信的模板消息。
     *
     * 只推送文本、图片及语音消息
     *
     * @param targetUserId
     * @param message 消息体
     */
    static sendMessage(targetUserId, targetUserName, message) {
        if (message.content_type == CONTENT_TYPES.PlainText ||
            message.content_type == CONTENT_TYPES.Image ||
            message.content_type == CONTENT_TYPES.Audio) {
            let patientClient = clientCache.findById(targetUserId);

            if (patientClient) {
                log.warn("User's wechat endpoint is online, sending via web socket. User id: ", targetUserId);

                WechatClient.sendViaWebSocket(patientClient.socket, message);
            } else {
                log.info("User's wechat endpoint is not online, sending via wechat template message. User id: ", targetUserId);

                WechatClient.sendViaMessageTemplate(targetUserId, targetUserName, message);
            }
        }
    };

    static sendViaWebSocket(socket, message) {
        socket.emit('message', {
            id: message.id,
            session_id: message.session_id,
            sender_id: message.sender_id,
            sender_name: message.sender_name,
            content_type: message.content_type,
            content: message.content,
            timestamp: ObjectUtil.timestampToLong(message.timestamp),

            type: message.content_type,          // legacy support
            name: message.sender_name
        });
    }

    /**
     * 发送微信模板消息给居民
     *
     * @param targetUserId
     * @param message
     */
    static sendViaMessageTemplate(targetUserId, targetUserName, message) {
        async.waterfall([
                // 获取微信openid
                function (callback) {
                    PatientRepo.findWechatOpenId(targetUserId, function (err, result) {
                        if (err) {
                            ModelUtil.logError("Get wechat openid failed", err);
                            return;
                        }

                        let openid = result && result.length > 0 ? result[0].openid : null;
                        if (!openid) {
                            ModelUtil.logError("User haven't bound with wechat, user id: " + targetUserId);
                            return;
                        }

                        log.warn("Send via wechat message template, user id: " + targetUserId + ", openid: " + openid);

                        callback(null, openid);
                    });
                },
                // 获取议题信息
                function (openid, callback) {
                    TopicRepo.findLastTopicStatus(message.session_id, function (err, res) {
                        if (err) {
                            ModelUtil.logError("Get topic failed", err);
                            return;
                        }

                        if (!res || res.length == 0) {
                            ModelUtil.logError("Unable to find session last topic");
                            return;
                        }

                        callback(null, openid, message.sender_name, res[0]);
                    });
                },
                // 发送消息
                function (openid, senderName, topic, callback) {
                    let replyContent = message.content;
                    switch (Number.parseInt(message.content_type)) {
                        case CONTENT_TYPES.Image:
                            replyContent = "[图片]";
                            break;
                        case CONTENT_TYPES.Audio:
                            replyContent = "[语音]";
                            break;
                        default:
                            break;
                    }

                    // 发送模板消息
                    WechatSDK.sendTemplateMessage({
                        touser: openid,
                        template_id: config.wechatConfig.template.consultTemplate,
                        url: config.wechatConfig.baseUrl + "/wx/html/yszx/html/consulting-doctor.html?openid=" + openid +
                        "&consult=" + topic.id + "&toUser=" + targetUserId + "&toName=" + targetUserName,
                        data: {
                            first: {value: "您的健康咨询有新的回复", color: "#000000"}
                            , remark: {value: "", color: "#000000"}
                            , keyword1: {value: topic.description, color: "#000000"}
                            , keyword2: {value: replyContent, color: "#000000"}
                            , keyword3: {value: senderName, color: "#000000"}
                        }
                    }, function (err, res) {
                        err ? log.error(err) : log.info(res);
                    });

                    callback(null, null);
                }
            ],
            function (err, res) {
                if (!err) {
                    log.info("Send via wechat template message, DONE!");
                }
            });
    };
}

module.exports = WechatClient;