added CORS headers

main.go

@@ -27,6 +27,8 @@ const (
 
 func main() {
 
+	// gin.SetMode(gin.ReleaseMode)
+
 	jsondb, err := db.OpenDB(dbname)
 	if err != nil {
 		fmt.Println(err)
@@ -48,6 +50,8 @@ func main() {
 	json.Unmarshal(read, &conf)
 
 	r := gin.Default()
+
+	r.Use(CORSMiddleware())
 	r.GET("/", Get)
 	r.GET("/:id", GetOne)
 	r.POST("/", Create)
@@ -60,6 +64,26 @@ func main() {
 	r.Run(":" + conf["port"].(string))
 }
 
+// CORSMiddleware function for injecting CORS headers
+// allows requests from any origin with caching for 1 day
+func CORSMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
+		c.Writer.Header().Set("Access-Control-Max-Age", "86400")
+		c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, PATCH, DELETE, UPDATE")
+		c.Writer.Header().Set("Access-Control-Allow-Headers", "Origin, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
+		c.Writer.Header().Set("Access-Control-Expose-Headers", "Content-Length")
+		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
+
+		if c.Request.Method == "OPTIONS" {
+			fmt.Println("OPTIONS")
+			c.AbortWithStatus(200)
+		} else {
+			c.Next()
+		}
+	}
+}
+
 // BulkDelete deletes record by id
 func BulkDelete(c *gin.Context) {