OP#792 initial commit after fork

cmd/crossdomain-xml-handler.go

@@ -0,0 +1,48 @@
+// Copyright (c) 2015-2024 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.xml
+const 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 setCrossDomainPolicyMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		cxml := crossDomainXML
+		if globalServerCtxt.CrossDomainXML != "" {
+			cxml = globalServerCtxt.CrossDomainXML
+		}
+		// Look for 'crossdomain.xml' in the incoming request.
+		if r.URL.Path == crossDomainXMLEntity {
+			// Write the standard cross domain policy xml.
+			w.Write([]byte(cxml))
+			// Request completed, no need to serve to other handlers.
+			return
+		}
+		h.ServeHTTP(w, r)
+	})
+}