event reply workd with event type

inMsg.go

 	"encoding/xml"
 )
 
+//EncryptedMsg encrypted message from Wechat
+type EncryptedMsg struct {
+	ToUserName string
+	Encrypt    string
+}
+
 //all xml message has these headers
 type CommonHeader struct {
 	ToUserName   string
 	xml.Unmarshal([]byte(s), &r)
 	return r
 }
+
+//ReadEncryptedMsg  get Encrypted Msg
+func ReadEncryptedMsg(s string) EncryptedMsg {
+	var r = EncryptedMsg{}
+	xml.Unmarshal([]byte(s), &r)
+	return r
+}

inMsg_test.go

 	AssertEqual(t, m.Url, "url", "Url failed")
 	AssertEqual(t, m.MsgId, int64(1234567890123456), "MsgId not match")
 }
+
+func TestReadEncryptMsg(t *testing.T) {
+	msg := `<xml>
+    <ToUserName><![CDATA[gh_f09231355c68]]></ToUserName>
+    <Encrypt><![CDATA[Dv3epMMhmmGU1o6lg71IfbpRrOYX1S8oZX3nwW0uBAHHMKx62T4KniS4efuf8fNHWf6gsF/YGaDraF6HhGOdKp8vbzluiIEsCnIveKN1pO+IUDOBBxzPAzQSFSYJ3OwVXWmBdBcC1S5guQrOxLysH+6UIWSor9cEef+94UAKTNw/MLB0zPfqK5TVoN1A0yobmP9OU8wtFJP0L1aKySPFGGbqBMfJkStRTrYLjIQfZ7pAIisB/g3c87w26r7LUz9hVh4ey3/T6cjQ8vKvgNKL3j8y4IwUdmnmTPrrdOsyA1pz69977xKHFtIptZYHKGD9dTW6PyPcKKTP6iOod6Agb8TI+is80auqHkjvUyvT/xPG8fxak/wI9BKzKndAnwxlcDG/8WElkHVl0TwxpsCb48ZxLEf4GFKaYaliC9xBVweKLNnqdbBmzwfe7GBNWC61h7KQYqwtZqMkZs3BBsStcQ==]]></Encrypt>
+</xml>`
+	m := ReadEncryptedMsg(msg)
+	AssertEqual(t, m.ToUserName, "gh_f09231355c68", "ToUserName failed")
+	AssertEqual(t, m.Encrypt, "Dv3epMMhmmGU1o6lg71IfbpRrOYX1S8oZX3nwW0uBAHHMKx62T4KniS4efuf8fNHWf6gsF/YGaDraF6HhGOdKp8vbzluiIEsCnIveKN1pO+IUDOBBxzPAzQSFSYJ3OwVXWmBdBcC1S5guQrOxLysH+6UIWSor9cEef+94UAKTNw/MLB0zPfqK5TVoN1A0yobmP9OU8wtFJP0L1aKySPFGGbqBMfJkStRTrYLjIQfZ7pAIisB/g3c87w26r7LUz9hVh4ey3/T6cjQ8vKvgNKL3j8y4IwUdmnmTPrrdOsyA1pz69977xKHFtIptZYHKGD9dTW6PyPcKKTP6iOod6Agb8TI+is80auqHkjvUyvT/xPG8fxak/wI9BKzKndAnwxlcDG/8WElkHVl0TwxpsCb48ZxLEf4GFKaYaliC9xBVweKLNnqdbBmzwfe7GBNWC61h7KQYqwtZqMkZs3BBsStcQ==", "ToUserName failed")
+}

main.go

 import (
 	"crypto/sha1"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"net/http/httputil"
 	case "GET":
 		answerInitialAuth(w, r)
 	default:
-		log.Fatalln("Unhandled HTTP %s", r.Method)
+		log.Fatalln(fmt.Sprintf("Unhandled HTTP %s", r.Method))
 		fmt.Fprintf(w, "Protocol Error: Expect GET or POST only")
 	}
 }
 //answerWechatPost  distribute PostRequest according to xml body info
 //
 func answerWechatPost(w http.ResponseWriter, r *http.Request) {
+	body, _ := ioutil.ReadAll(r.Body)
+	fmt.Printf("get body: %s", string(body))
+	s := ReadEncryptedMsg(string(body))
+	//fmt.Printf("to decrypt %s", s.Encrypt)
+	d := Decode(s.Encrypt)
+	fmt.Printf("decrypt as: %s", d)
+	h := ReadCommonHeader(d)
+	reply, _ := BuildTextMsg(h.MsgType, h.FromUserName)
+	fmt.Fprint(w, reply)
 	return
 }
 

outMsg.go

+package main
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"math/rand"
+	"sort"
+	"strings"
+	"time"
+)
+
+//BuildTextMsg Given a text message send it to wechat client
+func BuildTextMsg(txt string, ToUserName string) (string, error) {
+
+	template := `<xml>
+ <ToUserName><![CDATA[%s]]></ToUserName>
+ <FromUserName><![CDATA[%s]]></FromUserName>
+ <CreateTime>%d</CreateTime>
+ <MsgType><![CDATA[text]]></MsgType>
+ <Content><![CDATA[%s]]></Content>
+ </xml>`
+	msg := fmt.Sprintf(template, ToUserName, "gh_f09231355c68", int32(time.Now().Unix()), txt)
+	fmt.Println(msg)
+	e := Encode(msg)
+
+	str, _, _, _ := signMsg(e)
+	fmt.Println(str)
+	return str, nil
+}
+
+func signMsg(content string) (xml string, timestamp int32, nonce int32, signature string) {
+	timestamp = int32(time.Now().Unix())
+	nonce = rand.Int31()
+
+	strTimestamp := fmt.Sprintf("%d", timestamp)
+	strNonce := fmt.Sprintf("%d", nonce)
+	signature = getSignature(APIConfig.Token, strTimestamp, strNonce, content)
+	xml = "<xml>" +
+		"<Encrypt>" + content + "</Encrypt>" +
+		"<MsgSignature>" + signature + "</MsgSignature>" +
+		"<TimeStamp>" + strTimestamp + "</TimeStamp>" +
+		"<Nonce>" + strNonce + "</Nonce>" +
+		"</xml>"
+	return
+}
+
+func getSignature(token string, timestamp string, nonce string, content string) (signature string) {
+	strs := []string{token, timestamp, nonce, content}
+	sort.Strings(strs)
+	s := strings.Join(strs, "")
+	h := sha1.New()
+	h.Write([]byte(s))
+	signature = fmt.Sprintf("%x", h.Sum(nil))
+	return
+}

outMsg_test.go

+package main
+
+import "testing"
+
+func TestBuildTxtMsg(t *testing.T) {
+	BuildTextMsg("你好", "oUN420bxqFqlx0ZQHciUOesZO3PE")
+}
+
+func TextCalculateSignature (t *testing.T ){
+	
+}