read xml common header tested.

encrypt_test.go

 package main
 
-import "testing"
+import (
+	"testing"
+)
 
-func setupConfig() {
+func SetupConfig() {
 	APIConfig = WechatAPIConfig{
 		"skdq8vklaurfqemfszuif",
 		"cmtWK2teRnLOXyO5dw7lJkETv9jCeNAqYyguEu5D8gG",
 		"wx876e233fde456b7b",
 		"4a91aa328569b10a9fb97adeb8b0af58"}
 }
+
 func TestEncodingMesage(t *testing.T) {
-	setupConfig()
+	SetupConfig()
 
 	//明文：
 	var msg = `<xml><ToUserName><![CDATA[gh_f09231355c68]]></ToUserName>

inMsg.go

 //analyze xml message
 package main
 
+import (
+	"encoding/xml"
+)
+
 //all xml message has these headers
-type Header struct {
+type CommonHeader struct {
 	ToUserName   string
 	FromUserName string
-	CreatTime    int64
+	CreateTime   int64
 	MsgType      string
 }
 
 	Url         string
 	MsgId       int64
 }
+
+//ReadCommonHeader parse xml of common field of wechat post message
+func ReadCommonHeader(s string) CommonHeader {
+	var r = CommonHeader{}
+	xml.Unmarshal([]byte(s), &r)
+	return r
+}

inMsg_test.go

+package main
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestReadCommonHeader(t *testing.T) {
+	SetupConfig()
+	var msg = `<xml><ToUserName><![CDATA[gh_f09231355c68]]></ToUserName>
+<FromUserName><![CDATA[oUN420bxqFqlx0ZQHciUOesZO3PE]]></FromUserName>
+<CreateTime>1492972518</CreateTime>
+<MsgType><![CDATA[event]]></MsgType>
+<Event><![CDATA[CLICK]]></Event>
+<EventKey><![CDATA[V1001_TODAY_MUSIC]]></EventKey>
+</xml>`
+
+	h := ReadCommonHeader(msg)
+	assertEqual(t, h.ToUserName, "gh_f09231355c68", "ToUserName failed")
+	assertEqual(t, h.FromUserName, "oUN420bxqFqlx0ZQHciUOesZO3PE", "FromUserName failed")
+	assertEqual(t, h.MsgType, "event", "MsgType failed")
+	//for weird reasons assertEqual does not work for integer
+	if h.CreateTime != 1492972518 {
+		errmsg := fmt.Sprintf("CreateTime should be 1492972518, not %d", h.CreateTime)
+		t.Error(errmsg)
+	}
+
+}
+
+func assertEqual(t *testing.T, a interface{}, b interface{}, message string) {
+	if a == b {
+		return
+	}
+	if len(message) == 0 {
+		message = fmt.Sprintf("%v != %v", a, b)
+	}
+	message = fmt.Sprintf("%v != %v", a, b)
+	t.Fatal(message)
+}