corrects payload read/parse functionality

cmd/tpapi/httpTemplates.go

@@ -1,13 +1,16 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
+	"io"
 	"log"
 	"net"
-	"net/http"
 	"strconv"
 	"strings"
+
+	"encoding/json"
+	"net/http"
+
 	"tplink/internal/tplink"
 )
 
@@ -198,9 +201,19 @@ func tmpltTPlinkGet(w http.ResponseWriter, r *http.Request) {
 func tmpltTPlinkPost(w http.ResponseWriter, r *http.Request) {
 	var payload alertmanagerStruct
 
-	err := json.NewDecoder(r.Body).Decode(&payload)
+	// read body
+	defer r.Body.Close()
+	b, err := io.ReadAll(r.Body)
 	if err != nil {
-		log.Printf("[TRACE] Data received: %#v\n", r.Body)
+		log.Printf("[DEBUG] Unable to read post body from request: %v\n", err)
+		tmpltError(w, http.StatusInternalServerError, fmt.Sprintf("Unable to read post body from request: %v", err))
+		return
+	}
+
+	// unmarshal body
+	err = json.Unmarshal(b, &payload)
+	if err != nil {
+		log.Printf("[TRACE] Data received: %#v\n", string(b))
 		log.Printf("[INFO] Unable to parse payload from API call: %v\n", err)
 		tmpltError(w, http.StatusInternalServerError, fmt.Sprintf("Unable to read info from device: %v\n", err))
 		return