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server.go
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server.go
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// Copyright 2020 FastWeGo
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package wxopen
import (
"crypto/sha1"
"encoding/xml"
"fmt"
"io"
"net/http"
"sort"
"strconv"
"strings"
"time"
"github.com/fastwego/offiaccount/type/type_message"
"github.com/fastwego/offiaccount/util"
"github.com/fastwego/wxopen/type/type_platform"
)
/*
响应微信请求 或 推送消息/事件 的服务器
*/
type Server struct {
Ctx *Platform
}
// ParseXML 解析微信推送过来的消息/事件
func (s *Server) ParseXML(body []byte) (m interface{}, err error) {
if s.Ctx.Logger != nil {
s.Ctx.Logger.Println(string(body))
}
// 是否加密消息
encryptMsg := type_message.EncryptMessage{}
err = xml.Unmarshal(body, &encryptMsg)
if err != nil {
return
}
// 需要解密
if encryptMsg.Encrypt != "" {
var xmlMsg []byte
_, xmlMsg, _, err = util.AESDecryptMsg(encryptMsg.Encrypt, s.Ctx.Config.AesKey)
if err != nil {
return
}
body = xmlMsg
if s.Ctx.Logger != nil {
s.Ctx.Logger.Println("AESDecryptMsg ", string(body))
}
}
event := type_platform.Event{}
err = xml.Unmarshal(body, &event)
//fmt.Println(message)
if err != nil {
return
}
switch event.InfoType {
case type_platform.EventTypeComponentVerifyTicket:
msg := type_platform.EventComponentVerifyTicket{}
err = xml.Unmarshal(body, &msg)
if err != nil {
return
}
return msg, nil
case type_platform.EventTypeAuthorized:
msg := type_platform.EventAuthorized{}
err = xml.Unmarshal(body, &msg)
if err != nil {
return
}
return msg, nil
case type_platform.EventTypeUnauthorized:
msg := type_platform.EventUnauthorized{}
err = xml.Unmarshal(body, &msg)
if err != nil {
return
}
return msg, nil
case type_platform.EventTypeUpdateAuthorized:
msg := type_platform.EventUpdateAuthorized{}
err = xml.Unmarshal(body, &msg)
if err != nil {
return
}
return msg, nil
}
return
}
// Response 响应微信消息 (自动判断是否要加密)
func (s *Server) Response(writer http.ResponseWriter, request *http.Request, reply interface{}) (err error) {
output := []byte("success") // 默认回复
if reply != nil {
output, err = xml.Marshal(reply)
if err != nil {
return
}
// 加密
if request.URL.Query().Get("encrypt_type") == "aes" {
message := s.encryptReplyMessage(output)
output, err = xml.Marshal(message)
if err != nil {
return
}
}
}
_, err = writer.Write(output)
if s.Ctx.Logger != nil {
s.Ctx.Logger.Println("Response: ", string(output))
}
return
}
// encryptReplyMessage 加密回复消息
func (s *Server) encryptReplyMessage(rawXmlMsg []byte) (replyEncryptMessage type_message.ReplyEncryptMessage) {
cipherText := util.AESEncryptMsg([]byte(util.GetRandString(16)), rawXmlMsg, s.Ctx.Config.AppId, s.Ctx.Config.AesKey)
timestamp := strconv.FormatInt(time.Now().Unix(), 10)
nonce := util.GetRandString(6)
strs := []string{
timestamp,
nonce,
s.Ctx.Config.Token,
cipherText,
}
sort.Strings(strs)
h := sha1.New()
_, _ = io.WriteString(h, strings.Join(strs, ""))
signature := fmt.Sprintf("%x", h.Sum(nil))
return type_message.ReplyEncryptMessage{
Encrypt: cipherText,
MsgSignature: signature,
TimeStamp: timestamp,
Nonce: nonce,
}
}