forked from chanxuehong/wechat
/
serve_http.debug.go
257 lines (216 loc) · 7.15 KB
/
serve_http.debug.go
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// @description wechat 是腾讯微信公众平台 api 的 golang 语言封装
// @link https://github.com/chanxuehong/wechat for the canonical source repository
// @license https://github.com/chanxuehong/wechat/blob/master/LICENSE
// @authors chanxuehong(chanxuehong@gmail.com)
// +build wechatdebug
package corp
import (
"crypto/subtle"
"encoding/base64"
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"github.com/chanxuehong/wechat/util"
)
// 微信服务器请求 http body
type RequestHttpBody struct {
XMLName struct{} `xml:"xml" json:"-"`
CorpId string `xml:"ToUserName"`
AgentId int64 `xml:"AgentID"`
EncryptedMsg string `xml:"Encrypt"`
}
// ServeHTTP 处理 http 消息请求
// NOTE: 调用者保证所有参数有效
func ServeHTTP(w http.ResponseWriter, r *http.Request, queryValues url.Values, srv AgentServer, errHandler ErrorHandler) {
LogInfoln("[WECHAT_DEBUG] request uri:", r.RequestURI)
LogInfoln("[WECHAT_DEBUG] request remote-addr:", r.RemoteAddr)
LogInfoln("[WECHAT_DEBUG] request user-agent:", r.UserAgent())
switch r.Method {
case "POST": // 消息处理
msgSignature1 := queryValues.Get("msg_signature")
if msgSignature1 == "" {
errHandler.ServeError(w, r, errors.New("msg_signature is empty"))
return
}
if len(msgSignature1) != 40 { // sha1
err := fmt.Errorf("the length of msg_signature mismatch, have: %d, want: 40", len(msgSignature1))
errHandler.ServeError(w, r, err)
return
}
timestampStr := queryValues.Get("timestamp")
if timestampStr == "" {
errHandler.ServeError(w, r, errors.New("timestamp is empty"))
return
}
timestamp, err := strconv.ParseInt(timestampStr, 10, 64)
if err != nil {
err = errors.New("can not parse timestamp to int64: " + timestampStr)
errHandler.ServeError(w, r, err)
return
}
nonce := queryValues.Get("nonce")
if nonce == "" {
errHandler.ServeError(w, r, errors.New("nonce is empty"))
return
}
reqBody, err := ioutil.ReadAll(r.Body)
if err != nil {
errHandler.ServeError(w, r, err)
return
}
LogInfoln("[WECHAT_DEBUG] request msg http body:\r\n", string(reqBody))
// 解析 RequestHttpBody
var requestHttpBody RequestHttpBody
if err := xml.Unmarshal(reqBody, &requestHttpBody); err != nil {
errHandler.ServeError(w, r, err)
return
}
corpId := srv.CorpId()
haveCorpId := requestHttpBody.CorpId
if len(haveCorpId) != len(corpId) {
err = fmt.Errorf("the RequestHttpBody's ToUserName mismatch, have: %s, want: %s", haveCorpId, corpId)
errHandler.ServeError(w, r, err)
return
}
if subtle.ConstantTimeCompare([]byte(haveCorpId), []byte(corpId)) != 1 {
err = fmt.Errorf("the RequestHttpBody's ToUserName mismatch, have: %s, want: %s", haveCorpId, corpId)
errHandler.ServeError(w, r, err)
return
}
agentId := srv.AgentId()
haveAgentId := requestHttpBody.AgentId
if haveAgentId != agentId && haveAgentId != 0 {
err = fmt.Errorf("the RequestHttpBody's AgentId mismatch, have: %d, want: %d", haveAgentId, agentId)
errHandler.ServeError(w, r, err)
return
}
// 此时
// 要么 haveAgentId == wantAgentId,
// 要么 haveAgentId == 0
agentToken := srv.Token()
// 验证签名
msgSignature2 := util.MsgSign(agentToken, timestampStr, nonce, requestHttpBody.EncryptedMsg)
if subtle.ConstantTimeCompare([]byte(msgSignature1), []byte(msgSignature2)) != 1 {
err = fmt.Errorf("check msg_signature failed, input: %s, local: %s", msgSignature1, msgSignature2)
errHandler.ServeError(w, r, err)
return
}
// 解密
encryptedMsgBytes, err := base64.StdEncoding.DecodeString(requestHttpBody.EncryptedMsg)
if err != nil {
errHandler.ServeError(w, r, err)
return
}
aesKey := srv.CurrentAESKey()
random, rawMsgXML, err := util.AESDecryptMsg(encryptedMsgBytes, corpId, aesKey)
if err != nil {
// 尝试用上一次的 AESKey 来解密
lastAESKey, isLastAESKeyValid := srv.LastAESKey()
if !isLastAESKeyValid {
errHandler.ServeError(w, r, err)
return
}
aesKey = lastAESKey // NOTE
random, rawMsgXML, err = util.AESDecryptMsg(encryptedMsgBytes, corpId, aesKey)
if err != nil {
errHandler.ServeError(w, r, err)
return
}
}
LogInfoln("[WECHAT_DEBUG] request msg raw xml:\r\n", string(rawMsgXML))
// 解密成功, 解析 MixedMessage
var mixedMsg MixedMessage
if err = xml.Unmarshal(rawMsgXML, &mixedMsg); err != nil {
errHandler.ServeError(w, r, err)
return
}
// 安全考虑再次验证
if haveCorpId != mixedMsg.ToUserName {
err = fmt.Errorf("the RequestHttpBody's ToUserName(==%s) mismatch the MixedMessage's ToUserName(==%s)", haveCorpId, mixedMsg.ToUserName)
errHandler.ServeError(w, r, err)
return
}
if haveAgentId != mixedMsg.AgentId {
err = fmt.Errorf("the RequestHttpBody's AgentId(==%d) mismatch the MixedMessage's AgengId(==%d)", haveAgentId, mixedMsg.AgentId)
errHandler.ServeError(w, r, err)
return
}
// 如果是订阅/取消订阅 整个企业号, haveAgentId == 0
if haveAgentId != agentId {
if mixedMsg.MsgType == "event" &&
(mixedMsg.Event == "subscribe" || mixedMsg.Event == "unsubscribe") {
// do nothing
} else {
err = fmt.Errorf("the RequestHttpBody's AgentId mismatch, have: %d, want: %d", haveAgentId, agentId)
errHandler.ServeError(w, r, err)
return
}
}
// 成功, 交给 MessageHandler
req := &Request{
HttpRequest: r,
QueryValues: queryValues,
MsgSignature: msgSignature1,
Timestamp: timestamp,
Nonce: nonce,
RawMsgXML: rawMsgXML,
MixedMsg: &mixedMsg,
AESKey: aesKey,
Random: random,
CorpId: haveCorpId,
AgentId: haveAgentId,
AgentToken: agentToken,
}
srv.MessageHandler().ServeMessage(w, req)
case "GET": // 首次验证
msgSignature1 := queryValues.Get("msg_signature")
if msgSignature1 == "" {
errHandler.ServeError(w, r, errors.New("msg_signature is empty"))
return
}
if len(msgSignature1) != 40 { // sha1
err := fmt.Errorf("the length of msg_signature mismatch, have: %d, want: 40", len(msgSignature1))
errHandler.ServeError(w, r, err)
return
}
timestamp := queryValues.Get("timestamp")
if timestamp == "" {
errHandler.ServeError(w, r, errors.New("timestamp is empty"))
return
}
nonce := queryValues.Get("nonce")
if nonce == "" {
errHandler.ServeError(w, r, errors.New("nonce is empty"))
return
}
encryptedMsg := queryValues.Get("echostr")
if encryptedMsg == "" {
errHandler.ServeError(w, r, errors.New("echostr is empty"))
return
}
msgSignature2 := util.MsgSign(srv.Token(), timestamp, nonce, encryptedMsg)
if subtle.ConstantTimeCompare([]byte(msgSignature1), []byte(msgSignature2)) != 1 {
err := fmt.Errorf("check msg_signature failed, input: %s, local: %s", msgSignature1, msgSignature2)
errHandler.ServeError(w, r, err)
return
}
// 解密
encryptedMsgBytes, err := base64.StdEncoding.DecodeString(encryptedMsg)
if err != nil {
errHandler.ServeError(w, r, err)
return
}
corpId := srv.CorpId()
aesKey := srv.CurrentAESKey()
_, echostr, err := util.AESDecryptMsg(encryptedMsgBytes, corpId, aesKey)
if err != nil {
errHandler.ServeError(w, r, err)
return
}
w.Write(echostr)
}
}