/**
* Transform an URI accessible from the server into a URI accessible from the client. The mapping
* expires with the session.
*
* @param propertyContext context to obtain session
* @param uri server URI to transform
* @param filename file name
* @param contentType type of the content referred to by the URI, or null if unknown
* @param lastModified last modification timestamp
* @return client URI
*/
public static String proxyURI(
PropertyContext propertyContext,
String uri,
String filename,
String contentType,
long lastModified) {
// Create a digest, so that for a given URI we always get the same key
final String digest = SecureUtils.digestString(uri, "MD5", "hex");
// Get session
final ExternalContext externalContext =
(ExternalContext) propertyContext.getAttribute(PipelineContext.EXTERNAL_CONTEXT);
final ExternalContext.Session session =
externalContext.getSession(
true); // NOTE: We force session creation here. Should we? What's the alternative?
if (session != null) {
// Store mapping into session
session
.getAttributesMap(ExternalContext.Session.APPLICATION_SCOPE)
.put(
DYNAMIC_RESOURCES_SESSION_KEY + digest,
new DynamicResource(uri, filename, contentType, -1, lastModified));
}
// Rewrite new URI to absolute path without the context
return DYNAMIC_RESOURCES_PATH + digest;
}
