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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.apps.io;
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.net.URI;
- import java.net.URISyntaxException;
-
- import javax.xml.transform.Source;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.stream.StreamSource;
-
- import org.apache.xmlgraphics.io.Resource;
- import org.apache.xmlgraphics.io.ResourceResolver;
- import org.apache.xmlgraphics.util.uri.DataURIResolver;
-
- /**
- * This object holds the base URI from which to resolve URIs against as well as the resolver for
- * resource acquisition. It also does some URI sanitization of common URI syntactical errors. This
- * class takes in a {@link org.apache.xmlgraphics.io.ResourceResolver} and delegates all relevant
- * URIs to it.
- */
- public class InternalResourceResolver {
- private final URI baseUri;
- private final ResourceResolver resourceResolver;
- private final DataURIResolver dataSchemeResolver = new DataURIResolver();
-
- /**
- * @param baseUri the base URI from which to resolve relative URIs
- * @param resourceResolver the resolver to delegate to
- */
- InternalResourceResolver(URI baseUri, ResourceResolver resourceResolver) {
- this.baseUri = baseUri;
- this.resourceResolver = resourceResolver;
- }
-
- /**
- * Returns the base URI from which to resolve all URIs against.
- *
- * @return the base URI
- */
- public URI getBaseURI() {
- return baseUri;
- }
-
- /**
- * Retrieve a resource given a URI in String form. This also does some syntactical sanitaion on
- * the URI.
- *
- * @param stringUri the URI in String form
- * @return the resource
- * @throws IOException if an I/O error occurred
- * @throws URISyntaxException if the URI syntax was invalid
- */
- public Resource getResource(String stringUri) throws IOException, URISyntaxException {
- if (stringUri.startsWith("data:")) {
- return new Resource(resolveDataURI(stringUri));
- }
- return getResource(cleanURI(stringUri));
- }
-
- /**
- * Retrieve a resource given a URI in String form.
- *
- * @param uri the resource URI
- * @return the resource
- * @throws IOException if an I/O error occurred
- */
- public Resource getResource(URI uri) throws IOException {
- if (uri.getScheme() != null && uri.getScheme().startsWith("data")) {
- return new Resource(resolveDataURI(uri.toASCIIString()));
- }
- return resourceResolver.getResource(resolveFromBase(uri));
- }
-
- /**
- * Returns the OutputStream for a given URI.
- *
- * @param uri the URI for the inteded stream
- * @return the output stream
- * @throws IOException if an I/O error occurrred
- */
- public OutputStream getOutputStream(URI uri) throws IOException {
- return resourceResolver.getOutputStream(resolveFromBase(uri));
- }
-
- /**
- * Resolves a URI against the base URI.
- *
- * @param uri the URI that requires resolution
- * @return the resolved URI
- */
- public URI resolveFromBase(URI uri) {
- return baseUri.resolve(uri);
- }
-
- /**
- * Performs some sanitation for some of the most common URI syntax mistakes.
- *
- * @param uriStr the URI in String form
- * @return a valid URI
- * @throws URISyntaxException if the given String was too erroneous to validate
- */
- public static URI cleanURI(String uriStr) throws URISyntaxException {
- // replace back slash with forward slash to ensure windows file:/// URLS are supported
- if (uriStr == null) {
- return null;
- }
- String fixedUri = uriStr.replace('\\', '/');
- fixedUri = fixedUri.replace(" ", "%20");
- URI baseURI = new URI(fixedUri);
- return baseURI;
- }
-
- /**
- * Performs some sanitation for some of the most common URI syntax mistakes but returns a
- * directory URI rather than a file URI.
- *
- * @param base the directory URI in String form
- * @return the directory URI
- * @throws URISyntaxException if the given String was too erroneous to validate
- */
- public static URI getBaseURI(String base) throws URISyntaxException {
- String path = base + (base.endsWith("/") ? "" : "/");
- return cleanURI(path);
- }
-
- private InputStream resolveDataURI(String dataURI) {
- try {
- Source src = dataSchemeResolver.resolve(dataURI, "");
- return src == null ? null : ((StreamSource) src).getInputStream();
- } catch (TransformerException e) {
- throw new RuntimeException(e);
- }
- }
- }
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