download video message automatically by trying json file

download.go

 
 import (
 	"encoding/json"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"log"
 )
 
 func saveURL(url string) (tmpFile string, contentType string, err error) {
+	log.Println("saveURL: " + url)
 	var myClient = &http.Client{Timeout: 20 * time.Second}
 	r, err := myClient.Get(url)
 	if err != nil {
 	contentType = r.Header.Get("Content-Type")
 	contentLen := r.Header.Get("Content-Length")
 	len, _ := strconv.Atoi(contentLen)
-
+	log.Println(r)
 	file, err := ioutil.TempFile(os.TempDir(), "wechat_hitxy_")
 	// Use io.Copy to just dump the response body to the file. This supports huge files
 	_, err = io.Copy(file, r.Body)
 	if err != nil {
+		log.Println(err)
 		return "", contentType, err
 	}
 	tmpFile = file.Name()
 	if len < 4096 && contentType == "text/plain" {
 		u := readVideoURL(tmpFile)
 		if u != "" {
+			fmt.Println("saveing video url: " + u)
 			os.Remove(tmpFile) //remove json file
-			tmpFile, contentType, err = saveVideo(u)
+			tmpFile, contentType, err = saveURL(u)
 		}
 	}
 
 	}
 	return ""
 }
-
-func saveVideo(path string) (tmpFile string, contentType string, err error) {
-	u := readVideoURL(path)
-	if u != "" {
-		tmpFile, contentType, err = saveURL(u)
-	}
-	return
-}