feat: support cors (#92)

Author: fqdeng

cmd/main.go

@@ -33,6 +33,13 @@ func main() {
 
 	gin.SetMode(gin.ReleaseMode)
 	r := gin.Default()
+
+	// if viper get cors is true, then apply corsMiddleware
+	if viper.GetBool("cors") {
+		log.Printf("CORS supported! \n")
+		r.Use(corsMiddleware())
+	}
+
 	registerRoute(r)
 
 	srv := &http.Server{
@@ -43,6 +50,26 @@ func main() {
 	runServer(srv)
 }
 
+// corsMiddleware sets up the CORS headers for all responses
+func corsMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		// Clear any previously set headers
+		if c.Request.Method != "POST" {
+			c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
+		}
+		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
+		c.Writer.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization, X-Stainless-OS, X-STAINLESS-LANG, X-STAINLESS-PACKAGE-VERSION, X-STAINLESS-RUNTIME, X-STAINLESS-RUNTIME-VERSION, X-STAINLESS-ARCH")
+		c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+
+		// Handle preflight requests
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(200)
+			return
+		}
+		c.Next()
+	}
+}
+
 func runServer(srv *http.Server) {
 	go func() {
 		log.Printf("Server listening at %s\n", srv.Addr)
@@ -66,6 +93,7 @@ func parseFlag() {
 	pflag.StringP("configFile", "c", "config.yaml", "config file")
 	pflag.StringP("listen", "l", ":8080", "listen address")
 	pflag.BoolP("version", "v", false, "version information")
+	pflag.BoolP("cors", "s", false, "cors support")
 	pflag.Parse()
 	if err := viper.BindPFlags(pflag.CommandLine); err != nil {
 		panic(err)