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ServletResourceLoader.scala
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ServletResourceLoader.scala
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/**
* Copyright (C) 2009-2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* 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 org.fusesource.scalate.servlet
import java.io.File
import java.net.MalformedURLException
import javax.servlet.ServletContext
import org.fusesource.scalate.util.Resource._
import org.fusesource.scalate.util.{ FileResourceLoader, Log, ResourceLoader, ResourceNotFoundException }
object ServletResourceLoader extends Log {
def apply(context: ServletContext) = new ServletResourceLoader(context, new FileResourceLoader())
}
import org.fusesource.scalate.servlet.ServletResourceLoader._
/**
* Loads files using <code>ServletContext</code>.
*
* @author <a href="http://hiramchirino.com">Hiram Chirino</a>
*/
class ServletResourceLoader(
context: ServletContext,
delegate: ResourceLoader) extends ResourceLoader {
override def resource(uri: String) = {
val file = realFile(uri)
if (file != null) {
if (file.isFile)
Some(fromFile(file))
else
None
} else {
try {
val url = context.getResource(uri)
if (url != null) {
val resource = fromURL(url)
Some(resource)
} else {
delegate.resource(uri)
}
} catch {
case x: MalformedURLException =>
delegate.resource(uri)
}
}
}
/**
* Returns the real path for the given uri.
*/
def realPath(uri: String): String = {
// TODO should ideally use the Resource API as then we could try figure out
// the actual file for URL based resources not using getRealPath
// (which has issues sometimes with unexpanded WARs and overlays)
for (r <- resource(uri); f <- r.toFile if f != null) {
return f.getPath
}
val file = realFile(uri)
if (file != null) file.getPath else null
}
override protected def createNotFoundException(uri: String) = {
new ResourceNotFoundException(resource = uri, root = context.getRealPath("/"))
}
/**
* Returns the File for the given uri
*/
protected def realFile(uri: String): File = {
def findFile(uri: String): File = {
val path = context.getRealPath(uri)
debug("realPath for: " + uri + " is: " + path)
var answer: File = null
if (path != null) {
val file = new File(path)
debug("file from realPath for: " + uri + " is: " + file)
if (file.canRead) { answer = file }
}
answer
}
findFile(uri) match {
case file: File => file
case _ => if (uri.startsWith("/") && !uri.startsWith("/WEB-INF")) {
findFile("/WEB-INF" + uri)
} else {
null
}
}
}
}