Logs request body when parsing to JSON failed.

1 files changed, 14 insertions, 2 deletions

diff --git a/handler.go b/handler.go
index 076c806..f9d4a1e 100644
--- a/handler.go
+++ b/handler.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -21,12 +22,23 @@ func WebhookFailureHandler(w http.ResponseWriter, r *http.Request) {
 
 func WebhookHandler(w http.ResponseWriter, r *http.Request) {
 	decoder := json.NewDecoder(r.Body)
+
 	var hook Webhook
+	defer r.Body.Close()
+
 	err := decoder.Decode(&hook)
 	if err != nil {
-		log.Print("Wrong JSON.", err)
+
+		content, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			log.Println("Can't read r.Body.", err)
+		}
+		body := string(content)
+
+		log.Print("Wrong JSON.", err, "Original message: "+body)
+
 		w.WriteHeader(400)
-		w.Write([]byte("Wrong JSON."))
+		w.Write([]byte("Wrong JSON. " + err.Error() + " Original message: " + body))
 		return
 	}
 	if hook.Join != "" {