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minio/cmd/crossdomain-xml-handler.go

53 lines
2.2 KiB

/*
* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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"
// Cross domain policy implements http.Handler interface, implementing a custom ServerHTTP.
type crossDomainPolicy struct {
handler http.Handler
}
// 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 crossDomainPolicy{handler: h}
}
func (c crossDomainPolicy) ServeHTTP(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
}
// Continue to serve the request further.
c.handler.ServeHTTP(w, r)
}