move server code to seperate file for unit testing

main.go

 package main
 
 import (
-	"crypto/sha1"
-	"fmt"
-	"io/ioutil"
 	"log"
 	"net/http"
-	"net/http/httputil"
-	"net/url"
-	"sort"
-	"strings"
 )
 
 func main() {
 	//CreateDefaultMenu()
 	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))
-
-	switch r.Method {
-	case "POST":
-		answerWechatPost(w, r)
-	case "GET":
-		answerInitialAuth(w, r)
-	default:
-		log.Fatalln(fmt.Sprintf("Unhandled HTTP %s", r.Method))
-		fmt.Fprintf(w, "Protocol Error: Expect GET or POST only")
-	}
-}
-
-//
-//answerInitialAuth,  when wechat first verify our URL for API hooks
-//
-func answerInitialAuth(w http.ResponseWriter, r *http.Request) {
-	rq := r.URL.RawQuery
-	m, _ := url.ParseQuery(rq)
-
-	echostr, eok := m["echostr"]
-	if checkSignature(r) && eok {
-		fmt.Fprintf(w, echostr[0])
-	} else {
-		fmt.Fprintf(w, "wtf is wrong with the Internet")
-	}
-}
-
-//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
-}
-
-//
-func checkSignature(r *http.Request) bool {
-	rq := r.URL.RawQuery
-	m, _ := url.ParseQuery(rq)
-
-	signature, sok := m["signature"]
-	timestamp, tok := m["timestamp"]
-	nonce, nok := m["nonce"]
-	token := APIConfig.Token
-	if sok && tok && nok {
-		//sort token, timestamp, nonce  and join them
-		strs := []string{token, timestamp[0], nonce[0]}
-		sort.Strings(strs)
-		s := strings.Join(strs, "")
-
-		//calculate sha1
-		h := sha1.New()
-		h.Write([]byte(s))
-		calculated := fmt.Sprintf("%x", h.Sum(nil))
-		return signature[0] == calculated
-	}
-	return false
-}
-
-func checkSignature1() bool {
-	s1 := "e39de9f2e28079c01ebb4b803dfc3442b819545c"
-	t1 := "1492970761"
-	n1 := "1850971833"
-	token := APIConfig.Token
-
-	strs := []string{token, t1, n1}
-	sort.Strings(strs)
-	s := strings.Join(strs, "")
-
-	h := sha1.New()
-	h.Write([]byte(s))
-	us := fmt.Sprintf("%x", h.Sum(nil))
-	return s1 == us
-}
-
-//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) {
-	if err == nil {
-		fmt.Printf("%s\n\n", data)
-	} else {
-		log.Fatalf("%s\n\n", err)
-	}
-}

server.go

+package main
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"sort"
+	"strings"
+)
+
+//apiV1Main  version 1 main entry for all wechat callbacks
+//
+func apiV1Main(w http.ResponseWriter, r *http.Request) {
+	logRequestDebug(httputil.DumpRequest(r, true))
+
+	switch r.Method {
+	case "POST":
+		answerWechatPost(w, r)
+	case "GET":
+		answerInitialAuth(w, r)
+	default:
+		log.Fatalln(fmt.Sprintf("Unhandled HTTP %s", r.Method))
+		fmt.Fprintf(w, "Protocol Error: Expect GET or POST only")
+	}
+}
+
+//
+//answerInitialAuth,  when wechat first verify our URL for API hooks
+//
+func answerInitialAuth(w http.ResponseWriter, r *http.Request) {
+	rq := r.URL.RawQuery
+	m, _ := url.ParseQuery(rq)
+
+	echostr, eok := m["echostr"]
+	if checkSignature(r) && eok {
+		fmt.Fprintf(w, echostr[0])
+	} else {
+		fmt.Fprintf(w, "wtf is wrong with the Internet")
+	}
+}
+
+//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
+}
+
+//
+func checkSignature(r *http.Request) bool {
+	rq := r.URL.RawQuery
+	m, _ := url.ParseQuery(rq)
+
+	signature, sok := m["signature"]
+	timestamp, tok := m["timestamp"]
+	nonce, nok := m["nonce"]
+	token := APIConfig.Token
+	if sok && tok && nok {
+		//sort token, timestamp, nonce  and join them
+		strs := []string{token, timestamp[0], nonce[0]}
+		sort.Strings(strs)
+		s := strings.Join(strs, "")
+
+		//calculate sha1
+		h := sha1.New()
+		h.Write([]byte(s))
+		calculated := fmt.Sprintf("%x", h.Sum(nil))
+		return signature[0] == calculated
+	}
+	return false
+}
+
+func checkSignature1() bool {
+	s1 := "e39de9f2e28079c01ebb4b803dfc3442b819545c"
+	t1 := "1492970761"
+	n1 := "1850971833"
+	token := APIConfig.Token
+
+	strs := []string{token, t1, n1}
+	sort.Strings(strs)
+	s := strings.Join(strs, "")
+
+	h := sha1.New()
+	h.Write([]byte(s))
+	us := fmt.Sprintf("%x", h.Sum(nil))
+	return s1 == us
+}
+
+//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) {
+	if err == nil {
+		fmt.Printf("%s\n\n", data)
+	} else {
+		log.Fatalf("%s\n\n", err)
+	}
+}

server_test.go

+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+//when we setup wechate parameters,we chat will verify us
+func TestInitialSetup(t *testing.T) {
+	SetupConfig()
+}
+
+func TestWebRootHandler(t *testing.T) {
+	// Create a request to pass to our handler. We don't have any query parameters for now, so we'll
+	// pass 'nil' as the third parameter.
+	req, err := http.NewRequest("GET", "/dummydir", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// We create a ResponseRecorder (which satisfies http.ResponseWriter) to record the response.
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(webrootHandler)
+
+	// Our handlers satisfy http.Handler, so we can call their ServeHTTP method
+	// directly and pass in our Request and ResponseRecorder.
+	handler.ServeHTTP(rr, req)
+
+	// Check the status code is what we expect.
+	if status := rr.Code; status != http.StatusOK {
+		t.Errorf("handler returned wrong status code: got %v want %v",
+			status, http.StatusOK)
+	}
+
+	// Check the response body is what we expect.
+	expected := `Hi there, I love dummydir!`
+	if rr.Body.String() != expected {
+		t.Errorf("handler returned unexpected body: got %v want %v",
+			rr.Body.String(), expected)
+	}
+}