// Copyright (c) 2015-2021 MinIO, Inc.//// This file is part of MinIO Object Storage stack//// This program is free software: you can redistribute it and/or modify// it under the terms of the GNU Affero General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// This program is distributed in the hope that it will be useful// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU Affero General Public License for more details.//// You should have received a copy of the GNU Affero General Public License// along with this program.  If not, see <http://www.gnu.org/licenses/>. package cmd import "net/http" // Standard cross domain policy information located at https://s3.amazonaws.com/crossdomain.xmlconst crossDomainXML = `<?xml version="1.0"?><!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd"><cross-domain-policy><allow-access-from domain="*" secure="false" /></cross-domain-policy>` // Standard path where an app would find cross domain policy information.const crossDomainXMLEntity = "/crossdomain.xml" // A cross-domain policy file is an XML document that grants a web client, such as Adobe Flash Player// or Adobe Acrobat (though not necessarily limited to these), permission to handle data across domains.// When clients request content hosted on a particular source domain and that content make requests// directed towards a domain other than its own, the remote domain needs to host a cross-domain// policy file that grants access to the source domain, allowing the client to continue the transaction.func setCrossDomainPolicy(h http.Handler) http.Handler {	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {		// Look for 'crossdomain.xml' in the incoming request.		switch r.URL.Path {		case crossDomainXMLEntity:			// Write the standard cross domain policy xml.			w.Write([]byte(crossDomainXML))			// Request completed, no need to serve to other handlers.			return		}		h.ServeHTTP(w, r)	})}