fix #3 add server version on header.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

main.go

@@ -45,6 +45,7 @@ func GetMainEngine() *gin.Engine {
 	// Global middleware
 	r.Use(gin.Logger())
 	r.Use(gin.Recovery())
+	r.Use(VersionMiddleware())
 
 	r.GET("/api/status", api.StatusHandler)
 	r.POST("/api/push", pushHandler)

notification.go

@@ -4,6 +4,7 @@ import (
 	apns "github.com/sideshow/apns2"
 	"github.com/sideshow/apns2/certificate"
 	"github.com/sideshow/apns2/payload"
+	_ "github.com/google/go-gcm"
 	"log"
 )
 

version.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"github.com/gin-gonic/gin"
+)
+
+func PrintGoPushVersion() {
+	fmt.Printf(`GoPush %s Compiler: %s %s Copyright (C) 2016 Bo-Yi Wu, Inc.`,
+		Version,
+		runtime.Compiler,
+		runtime.Version())
+}
+
+func VersionMiddleware() gin.HandlerFunc {
+	// Set out header value for each response
+	return func(c *gin.Context) {
+		c.Writer.Header().Set("Server-Version", "GoPush "+Version)
+		c.Next()
+	}
+}