gosdk/wechat/server/server.go

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2024-01-22 22:34:59 +08:00
package server
import (
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"reflect"
"runtime/debug"
"strconv"
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"git.u8t.cn/open/gosdk/wechat/context"
"git.u8t.cn/open/gosdk/wechat/message"
"git.u8t.cn/open/gosdk/wechat/util"
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)
// Server struct
type Server struct {
*context.Context
debug bool
openID string
messageHandler func(message.MixMessage) *message.Reply
requestRawXMLMsg []byte
requestMsg message.MixMessage
responseRawXMLMsg []byte
responseMsg interface{}
isSafeMode bool
random []byte
nonce string
timestamp int64
}
// NewServer init
func NewServer(context *context.Context) *Server {
srv := new(Server)
srv.Context = context
return srv
}
// SetDebug set debug field
func (srv *Server) SetDebug(debug bool) {
srv.debug = debug
}
// Serve 处理微信的请求消息
func (srv *Server) Serve() error {
if !srv.Validate() {
return fmt.Errorf("请求校验失败")
}
echostr, exists := srv.GetQuery("echostr")
if exists {
srv.String(echostr)
return nil
}
response, err := srv.handleRequest()
if err != nil {
return err
}
//debug
if srv.debug {
fmt.Println("request msg = ", string(srv.requestRawXMLMsg))
}
return srv.buildResponse(response)
}
// Validate 校验请求是否合法
func (srv *Server) Validate() bool {
if srv.debug {
return true
}
timestamp := srv.Query("timestamp")
nonce := srv.Query("nonce")
signature := srv.Query("signature")
return signature == util.Signature(srv.Token, timestamp, nonce)
}
// HandleRequest 处理微信的请求
func (srv *Server) handleRequest() (reply *message.Reply, err error) {
//set isSafeMode
srv.isSafeMode = false
encryptType := srv.Query("encrypt_type")
if encryptType == "aes" {
srv.isSafeMode = true
}
//set openID
srv.openID = srv.Query("openid")
var msg interface{}
msg, err = srv.getMessage()
if err != nil {
return
}
mixMessage, success := msg.(message.MixMessage)
if !success {
err = errors.New("消息类型转换失败")
}
srv.requestMsg = mixMessage
reply = srv.messageHandler(mixMessage)
return
}
// GetOpenID return openID
func (srv *Server) GetOpenID() string {
return srv.openID
}
// getMessage 解析微信返回的消息
func (srv *Server) getMessage() (interface{}, error) {
var rawXMLMsgBytes []byte
var err error
if srv.isSafeMode {
var encryptedXMLMsg message.EncryptedXMLMsg
if err := xml.NewDecoder(srv.Request.Body).Decode(&encryptedXMLMsg); err != nil {
return nil, fmt.Errorf("从body中解析xml失败,err=%v", err)
}
//验证消息签名
timestamp := srv.Query("timestamp")
srv.timestamp, err = strconv.ParseInt(timestamp, 10, 32)
if err != nil {
return nil, err
}
nonce := srv.Query("nonce")
srv.nonce = nonce
msgSignature := srv.Query("msg_signature")
msgSignatureGen := util.Signature(srv.Token, timestamp, nonce, encryptedXMLMsg.EncryptedMsg)
if msgSignature != msgSignatureGen {
return nil, fmt.Errorf("消息不合法,验证签名失败")
}
//解密
srv.random, rawXMLMsgBytes, err = util.DecryptMsg(srv.AppID, encryptedXMLMsg.EncryptedMsg, srv.EncodingAESKey)
if err != nil {
return nil, fmt.Errorf("消息解密失败, err=%v", err)
}
} else {
rawXMLMsgBytes, err = ioutil.ReadAll(srv.Request.Body)
if err != nil {
return nil, fmt.Errorf("从body中解析xml失败, err=%v", err)
}
}
srv.requestRawXMLMsg = rawXMLMsgBytes
return srv.parseRequestMessage(rawXMLMsgBytes)
}
func (srv *Server) parseRequestMessage(rawXMLMsgBytes []byte) (msg message.MixMessage, err error) {
msg = message.MixMessage{}
err = xml.Unmarshal(rawXMLMsgBytes, &msg)
return
}
// SetMessageHandler 设置用户自定义的回调方法
func (srv *Server) SetMessageHandler(handler func(message.MixMessage) *message.Reply) {
srv.messageHandler = handler
}
func (srv *Server) buildResponse(reply *message.Reply) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("panic error: %v\n%s", e, debug.Stack())
}
}()
if reply == nil {
//do nothing
return nil
}
msgType := reply.MsgType
switch msgType {
case message.MsgTypeText:
case message.MsgTypeImage:
case message.MsgTypeVoice:
case message.MsgTypeVideo:
case message.MsgTypeMusic:
case message.MsgTypeNews:
case message.MsgTypeTransfer:
default:
err = message.ErrUnsupportReply
return
}
msgData := reply.MsgData
value := reflect.ValueOf(msgData)
//msgData must be a ptr
kind := value.Kind().String()
if "ptr" != kind {
return message.ErrUnsupportReply
}
params := make([]reflect.Value, 1)
params[0] = reflect.ValueOf(srv.requestMsg.FromUserName)
value.MethodByName("SetToUserName").Call(params)
params[0] = reflect.ValueOf(srv.requestMsg.ToUserName)
value.MethodByName("SetFromUserName").Call(params)
params[0] = reflect.ValueOf(msgType)
value.MethodByName("SetMsgType").Call(params)
params[0] = reflect.ValueOf(util.GetCurrTs())
value.MethodByName("SetCreateTime").Call(params)
srv.responseMsg = msgData
srv.responseRawXMLMsg, err = xml.Marshal(msgData)
return
}
// Send 将自定义的消息发送
func (srv *Server) Send() (err error) {
replyMsg := srv.responseMsg
if srv.isSafeMode {
//安全模式下对消息进行加密
var encryptedMsg []byte
encryptedMsg, err = util.EncryptMsg(srv.random, srv.responseRawXMLMsg, srv.AppID, srv.EncodingAESKey)
if err != nil {
return
}
//TODO 如果获取不到timestamp nonce 则自己生成
timestamp := srv.timestamp
timestampStr := strconv.FormatInt(timestamp, 10)
msgSignature := util.Signature(srv.Token, timestampStr, srv.nonce, string(encryptedMsg))
replyMsg = message.ResponseEncryptedXMLMsg{
EncryptedMsg: string(encryptedMsg),
MsgSignature: msgSignature,
Timestamp: timestamp,
Nonce: srv.nonce,
}
}
if replyMsg != nil {
srv.XML(replyMsg)
}
return
}