router: added middlewares

app/router/corsmw.go

@@ -0,0 +1,33 @@
+package router
+
+func NewCorsMiddleware() MiddlewareFunc {
+	mw := func(next Handler) Handler {
+		return newCorsHandler(next)
+	}
+	return mw
+}
+
+type corsHandler struct {
+	next Handler
+}
+
+func newCorsHandler(next Handler) *corsHandler {
+	return &corsHandler{
+		next: next,
+	}
+}
+
+func (hand corsHandler) ServeHTTP(ctx *Context) {
+	origin := ctx.Request.Header.Get("Origin")
+	if origin != "" {
+		ctx.SetHeader("Access-Control-Allow-Origin", origin)
+		ctx.SetHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE, PATCH")
+		ctx.SetHeader("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
+		ctx.SetHeader("Access-Control-Max-Age", "86400")
+		ctx.SetHeader("Access-Control-Allow-Credentials", "true")
+	}
+	if ctx.Request.Method == "OPTIONS" {
+		return
+	}
+	hand.next.ServeHTTP(ctx)
+}