2021-08-17 01:55:55 +08:00
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package main
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"mime/multipart"
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"net/http"
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"os"
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"reflect"
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"time"
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"github.com/go-redis/redis/v8"
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)
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/*------------------------------- 环境变量配置 begin -------------------------------*/
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var Sendkey = GetEnvDefault("SENDKEY", "set_a_sendkey")
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var WecomCid = GetEnvDefault("WECOM_CID", "企业微信公司ID")
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var WecomSecret = GetEnvDefault("WECOM_SECRET", "企业微信应用Secret")
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var WecomAid = GetEnvDefault("WECOM_AID", "企业微信应用ID")
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var WecomToUid = GetEnvDefault("WECOM_TOUID", "@all")
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var RedisStat = GetEnvDefault("REDIS_STAT", "OFF")
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var RedisAddr = GetEnvDefault("REDIS_ADDR", "localhost:6379")
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var RedisPassword = GetEnvDefault("REDIS_PASSWORD", "")
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var ctx = context.Background()
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/*------------------------------- 环境变量配置 end -------------------------------*/
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/*------------------------------- 企业微信服务端API begin -------------------------------*/
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var GetTokenApi = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=%s&corpsecret=%s"
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var SendMessageApi = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=%s"
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var UploadMediaApi = "https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token=%s&type=%s"
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/*------------------------------- 企业微信服务端API end -------------------------------*/
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type Msg struct {
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Content string `json:"content"`
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}
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type Pic struct {
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MediaId string `json:"media_id"`
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}
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type JsonData struct {
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ToUser string `json:"touser"`
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AgentId string `json:"agentid"`
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MsgType string `json:"msgtype"`
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DuplicateCheckInterval int `json:"duplicate_check_interval"`
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Text Msg `json:"text"`
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Image Pic `json:"image"`
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}
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// GetEnvDefault 获取配置信息,未获取到则取默认值
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func GetEnvDefault(key, defVal string) string {
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val, ex := os.LookupEnv(key)
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if !ex {
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return defVal
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}
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return val
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}
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// ParseJson 将json字符串解析为map
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func ParseJson(jsonStr string) map[string]interface{} {
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var wecomResponse map[string]interface{}
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if string(jsonStr) != "" {
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err := json.Unmarshal([]byte(string(jsonStr)), &wecomResponse)
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if err != nil {
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log.Println("生成json字符串错误")
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}
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}
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return wecomResponse
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}
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// GetRemoteToken 从企业微信服务端API获取access_token,存在redis服务则缓存
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func GetRemoteToken(corpId, appSecret string) string {
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getTokenUrl := fmt.Sprintf(GetTokenApi, corpId, appSecret)
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log.Println("getTokenUrl==>", getTokenUrl)
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resp, err := http.Get(getTokenUrl)
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if err != nil {
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log.Println(err)
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}
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defer resp.Body.Close()
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respData, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Println(err)
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}
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tokenResponse := ParseJson(string(respData))
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log.Println("企业微信获取access_token接口返回==>", tokenResponse)
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accessToken := tokenResponse["access_token"].(string)
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if RedisStat == "ON" {
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log.Println("prepare to set redis key")
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rdb := RedisClient()
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// access_token有效时间为7200秒(2小时)
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set, err := rdb.SetNX(ctx, "access_token", accessToken, 7000*time.Second).Result()
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log.Println(set)
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if err != nil {
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log.Println(err)
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}
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}
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return accessToken
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}
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// RedisClient redis客户端
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func RedisClient() *redis.Client {
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rdb := redis.NewClient(&redis.Options{
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Addr: RedisAddr,
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Password: RedisPassword, // no password set
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DB: 0, // use default DB
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})
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return rdb
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}
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// PostMsg 推送消息
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func PostMsg(postData JsonData, postUrl string) string {
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postJson, _ := json.Marshal(postData)
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log.Println("postJson ", string(postJson))
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log.Println("postUrl ", postUrl)
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msgReq, err := http.NewRequest("POST", postUrl, bytes.NewBuffer(postJson))
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if err != nil {
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log.Println(err)
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}
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msgReq.Header.Set("Content-Type", "application/json")
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client := &http.Client{}
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resp, err := client.Do(msgReq)
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if err != nil {
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log.Fatalln("企业微信发送应用消息接口报错==>", err)
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}
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defer msgReq.Body.Close()
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body, _ := ioutil.ReadAll(resp.Body)
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mediaResp := ParseJson(string(body))
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log.Println("企业微信发送应用消息接口返回==>", mediaResp)
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return string(body)
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}
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// CheckOrUploadMedia 核对消息类型,如果为图片则上传临时素材并返回mediaId
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func CheckOrUploadMedia(msgType string, req *http.Request, accessToken string) string {
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if msgType != "image" {
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log.Println("消息类型不是图片")
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return ""
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}
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// 企业微信图片上传不能大于2M
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_ = req.ParseMultipartForm(2 << 20)
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imgFile, imgHeader, err := req.FormFile("media")
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log.Printf("文件大小==>%d字节", imgHeader.Size)
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if err != nil {
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log.Fatalln("图片文件出错==>", err)
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return ""
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}
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buf := new(bytes.Buffer)
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writer := multipart.NewWriter(buf)
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if createFormFile, err := writer.CreateFormFile("media", imgHeader.Filename); err == nil {
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readAll, _ := ioutil.ReadAll(imgFile)
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createFormFile.Write(readAll)
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}
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writer.Close()
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uploadMediaUrl := fmt.Sprintf(UploadMediaApi, accessToken, msgType)
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log.Println("uploadMediaUrl==>", uploadMediaUrl)
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newRequest, _ := http.NewRequest("POST", uploadMediaUrl, buf)
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newRequest.Header.Set("Content-Type", writer.FormDataContentType())
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log.Println("Content-Type ", writer.FormDataContentType())
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client := &http.Client{}
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resp, err := client.Do(newRequest)
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respData, _ := ioutil.ReadAll(resp.Body)
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mediaResp := ParseJson(string(respData))
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log.Println("企业微信上传临时素材接口返回==>", mediaResp)
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if err != nil {
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log.Fatalln("上传临时素材出错==>", err)
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return ""
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} else {
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return mediaResp["media_id"].(string)
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}
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}
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// IsZero 判断企业微信服务端是否正常响应
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func IsZero(v interface{}) (bool, error) {
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t := reflect.TypeOf(v)
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if !t.Comparable() {
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return false, fmt.Errorf("type is not comparable: %v", t)
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}
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return v == reflect.Zero(t).Interface(), nil
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}
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// 获取企业微信的access_token
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func getAccessToken() string {
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accessToken := ""
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if RedisStat == "ON" {
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log.Println("尝试从redis获取token")
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rdb := RedisClient()
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value, err := rdb.Get(ctx, "access_token").Result()
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if err == redis.Nil {
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log.Println("access_token does not exist, need get it from remote API")
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}
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accessToken = value
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}
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if accessToken == "" {
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log.Println("get access_token from remote API")
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accessToken = GetRemoteToken(WecomCid, WecomSecret)
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} else {
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log.Println("get access_token from redis")
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}
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return accessToken
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}
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// InitJsonData 初始化Json公共部分数据
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func InitJsonData(msgType string) JsonData {
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return JsonData{
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ToUser: WecomToUid,
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AgentId: WecomAid,
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MsgType: msgType,
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DuplicateCheckInterval: 600,
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}
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}
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// 主函数入口
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func main() {
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// 设置日志内容显示文件名和行号
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log.SetFlags(log.LstdFlags | log.Lshortfile)
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wecomChan := func(res http.ResponseWriter, req *http.Request) {
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_ = req.ParseForm()
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sendkey := req.FormValue("sendkey")
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if sendkey != Sendkey {
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log.Panicln("sendkey 错误,请检查")
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}
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msgContent := req.FormValue("msg")
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msgType := req.FormValue("msg_type")
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log.Println("mes_type=", msgType)
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2021-08-17 21:01:04 +08:00
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// 刷新token
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accessToken := getAccessToken()
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2021-08-17 01:55:55 +08:00
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mediaId := CheckOrUploadMedia(msgType, req, accessToken)
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log.Println("企业微信上传临时素材接口返回的media_id==>", mediaId)
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// 准备发送应用消息所需参数
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postData := InitJsonData(msgType)
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postData.Text = Msg{
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Content: msgContent,
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}
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postData.Image = Pic{
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MediaId: mediaId,
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}
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2021-08-17 21:01:04 +08:00
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// 再次刷新token
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accessToken = getAccessToken()
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2021-08-17 01:55:55 +08:00
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sendMessageUrl := fmt.Sprintf(SendMessageApi, accessToken)
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postStatus := PostMsg(postData, sendMessageUrl)
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postResponse := ParseJson(postStatus)
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errcode := postResponse["errcode"]
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_, err := IsZero(errcode)
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if err != nil {
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log.Printf("%v", err)
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}
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res.Header().Set("Content-type", "application/json")
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_, _ = res.Write([]byte(postStatus))
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}
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http.HandleFunc("/wecomchan", wecomChan)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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