Menu sample request added

Api_request.txt

     <Event><![CDATA[unsubscribe]]></Event>
     <EventKey><![CDATA[]]></EventKey>
     <Encrypt><![CDATA[brFRc2b7iWU+sxTJfQ1Alp+GcR69Wkeh6Bb88z6XP/q8feWBbvo1odwZ97WrPV5UE2ctrzY88F0J5gt1ECX6OgcKMtZQiZgucXwsh53N9jyDRV+j6zJ1kpJiAf0UxUV7B0Q6OEX830Exoaylj9ZwoR1iQL84eB8CSVmUHRGNxqMK5hg6frE65guh9WysbIs2MWvHVXo7FsXj7ipK9s2VNqawR0VctKPxSnjAPjIxu2Q9MQXnhegePbuLnjTfW2YyY0cKx4XU+tvKlnQbwGgw4rxmcOjuF5lkknxK6JefeHtnKXTiXgcRmEtcbVneWxfW5FsUQkIDQa62IuTs/m4THZDc4opvLmOFXgUR9+BBnIVXyUNvt8zm9DDUUTd+rGz0SDx6sQ3S6WxITp7HKAR6wEHf+eSEwquzmSrGfgAR9Vs=]]></Encrypt>
-</xml>
+</xml>
+
+
+
+Receive : text
+
+POST /api?signature=3335bc3514757c602e6b1630cd84812caacb43d5&timestamp=1492791675&nonce=515316134&openid=oUN420bxqFqlx0ZQHciUOesZO3PE&encrypt_type=aes&msg_signature=c73e7c78c10c0b87846a422cce275ec0d2894ef9 HTTP/1.1
+Host: wechat.hitxy.org.au
+Accept: */*
+Cache-Control: no-cache
+Connection: Keep-Alive
+Content-Length: 765
+Content-Type: text/xml
+Pragma: no-cache
+User-Agent: Mozilla/4.0
+X-Forwarded-For: 103.7.30.105
+X-Forwarded-Host: wechat.hitxy.org.au
+X-Forwarded-Server: wechat.hitxy.org.au
+
+
+<xml>
+    <ToUserName><![CDATA[gh_f09231355c68]]></ToUserName>
+    <FromUserName><![CDATA[oUN420bxqFqlx0ZQHciUOesZO3PE]]></FromUserName>
+    <CreateTime>1492791675</CreateTime>
+    <MsgType><![CDATA[text]]></MsgType>
+    <Content><![CDATA[13]]></Content>
+    <MsgId>6411491424278595449</MsgId>
+    <Encrypt><![CDATA[02dtsmvIHONkhxYtyPivtKCkKSQ/ly8UDxxlJPecQFNZGeBMYyMtBq0ufgXJkF5AJYEa5SwSXHeJe7mSsrq5GbNbbUVzLiRERhYK7iVaQuacF/WPY1qOwbTAOHFsZfsUD1oNf64GdKh5Evx5mzXfynmonFinCDUTloWX5M8EW323XNtHcGi2eF11+KMOL9HBdQdG4kSoM/OxaSeXls+D+Co08ZNt9pMDlUvlpHzeYVhudiamxja0+FWSLDlitYENHWNN+LnXyqqfAnAb82dhzKRRSw1c+d/TGFVOYgU1NWt9fZ036qY6/JIwyFNwbFkDdYa0QAzkPJU36zxYesnGUWmu5xHjnrFpfmwG+eZSUuWbNcnu81VbrYhkaD0/4vJwk/EvFySA0Fa/r+B3Lav/d762KhZ2D+at6BD1oWRHFYA=]]></Encrypt>
+</xml>
+
+
+
+Create menu 
+ {
+     "button":[
+     {	
+          "type":"click",
+          "name":"今日歌曲",
+          "key":"V1001_TODAY_MUSIC"
+      },
+      {
+           "name":"菜单",
+           "sub_button":[
+           {	
+               "type":"view",
+               "name":"搜索",
+               "url":"http://www.soso.com/"
+            },
+            {
+                 "type":"miniprogram",
+                 "name":"wxa",
+                 "url":"http://mp.weixin.qq.com",
+                 "appid":"wx286b93c14bbf93aa",
+                 "pagepath":"pages/lunar/index.html"
+             },
+            {
+               "type":"click",
+               "name":"赞一下我们",
+               "key":"V1001_GOOD"
+            }]
+       }]
+ }
+
+
+
+ {
+    "button": [
+        {
+            "name": "扫码", 
+            "sub_button": [
+                {
+                    "type": "scancode_waitmsg", 
+                    "name": "扫码带提示", 
+                    "key": "rselfmenu_0_0", 
+                    "sub_button": [ ]
+                }, 
+                {
+                    "type": "scancode_push", 
+                    "name": "扫码推事件", 
+                    "key": "rselfmenu_0_1", 
+                    "sub_button": [ ]
+                }
+            ]
+        }, 
+        {
+            "name": "发图", 
+            "sub_button": [
+                {
+                    "type": "pic_sysphoto", 
+                    "name": "系统拍照发图", 
+                    "key": "rselfmenu_1_0", 
+                   "sub_button": [ ]
+                 }, 
+                {
+                    "type": "pic_photo_or_album", 
+                    "name": "拍照或者相册发图", 
+                    "key": "rselfmenu_1_1", 
+                    "sub_button": [ ]
+                }, 
+                {
+                    "type": "pic_weixin", 
+                    "name": "微信相册发图", 
+                    "key": "rselfmenu_1_2", 
+                    "sub_button": [ ]
+                }
+            ]
+        }, 
+        {
+            "name": "发送位置", 
+            "type": "location_select", 
+            "key": "rselfmenu_2_0"
+        },
+        {
+           "type": "media_id", 
+           "name": "图片", 
+           "media_id": "MEDIA_ID1"
+        }, 
+        {
+           "type": "view_limited", 
+           "name": "图文消息", 
+           "media_id": "MEDIA_ID2"
+        }
+    ]
+}

accessToken.go

 	Time        time.Time `json:"created_at"`
 }
 
-func main2() {
-	e, _ := renewAuthtoken()
-	t, _ := readTokenFromFile("/tmp/wechat_hitxy_token")
-	fmt.Println(isAuthTokenExpired(t), e)
+//GetAccessToken returns a valid access_token for wechat_api
+//    the token is auomatically renewed if it's about to expire
+//    if error happens, return empty string and error
+//    if success, return token string and nil
+func GetAccessToken() (string, error) {
+	t, err := readTokenFromFile("/tmp/wechat_hitxy_token")
+	if isAuthTokenExpired(t) {
+		t, err = renewAuthtoken()
+		if err != nil {
+			return "", err // cannot get token
+		}
+	}
+	return t.AccessToken, nil
 }
 
 func isAuthTokenExpired(t authToken) bool {
 	return time.Now().After(expire)
 }
 
+//save token to perminant storage
 func writeTokenToFile(body []byte, path string) {
 	log.Printf("writing authtoke to %s\r\n", path)
 	ioutil.WriteFile(path, body, 0600)
 }
 
+//read token from permenant storage
 func readTokenFromFile(path string) (authToken, error) {
 	var m authToken
 	log.Printf("read authtoke from %s\r\n", path)
 	return m, err
 }
 
+//issue web request to get token from wechat
 func renewAuthtoken() (authToken, error) {
 	//url := "http://vimeo.com/api/v2/brad/info.json"
 	url := "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wx876e233fde456b7b&secret=4a91aa328569b10a9fb97adeb8b0af58"

main.go

 	"net/url"
 )
 
-func handler(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
-	rq := r.URL.RawQuery
-	m, _ := url.ParseQuery(rq)
-	for index, element := range m {
-		fmt.Fprintf(w, "<br>%s => %s", index, element)
-	}
-	fmt.Fprintf(w, m["k"][0])
-	logRequestDebug(httputil.DumpRequest(r, true))
+func main() {
+	http.HandleFunc("/", webrootHandler)
+	http.HandleFunc("/api", apiV1Main)
+	//http.ListenAndServe("127.0.0.1:65500", nil)
+	http.ListenAndServe(":65500", nil)
 }
 
+//apiV1Main  version 1 main entry for all wechat callbacks
+//
 func apiV1Main(w http.ResponseWriter, r *http.Request) {
 	logRequestDebug(httputil.DumpRequest(r, true))
 	rq := r.URL.RawQuery
 	fmt.Fprintf(w, m["echostr"][0])
 }
 
-func main() {
-	http.HandleFunc("/", handler)
-	http.HandleFunc("/api", apiV1Main)
-	//http.ListenAndServe("127.0.0.1:65500", nil)
-	http.ListenAndServe(":65500", nil)
+//webrootHandler sending contents to client when request "/"
+//      essentially to prove the webserver is still alive
+//      echo query string to the client
+func webrootHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
+	rq := r.URL.RawQuery
+	m, _ := url.ParseQuery(rq)
+	for index, element := range m {
+		fmt.Fprintf(w, "\r\n%s => %s", index, element)
+	}
+	logRequestDebug(httputil.DumpRequest(r, true))
+
 }
 
 func logRequestDebug(data []byte, err error) {