HalBrowserRootForwardFilter.java
/*
* #%L
* wcm.io
* %%
* Copyright (C) 2015 wcm.io
* %%
* 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.
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*/
package io.wcm.caravan.hal.browser.impl;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
/**
* Filter that returns the content of the /halbrowser/browser.html
*/
@Component(immediate = true)
@Service(Filter.class)
@Property(name = "pattern", value = HalBrowserHttpServiceMounter.HALBROWSER_URI_PREFIX + "(/)?")
public class HalBrowserRootForwardFilter implements Filter {
private static final String INDEX_PAGE_PATH = "/halbrowser-webapp/browser.html";
private byte[] indexPageContent;
@Override
public void init(FilterConfig value) throws ServletException {
try (InputStream is = getClass().getResourceAsStream(INDEX_PAGE_PATH)) {
String markup = IOUtils.toString(is, "UTF-8");
// inject base element to ensure correct loading of referenced resources
markup = markup.replaceFirst("<head>",
"<head><base href=\"" + HalBrowserHttpServiceMounter.HALBROWSER_URI_PREFIX + "/browser.html\">");
indexPageContent = markup.getBytes("UTF-8");
}
catch (IOException ex) {
throw new ServletException("Unable to get content from: " + INDEX_PAGE_PATH, ex);
}
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse)servletResponse;
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType("text/html");
response.setContentLength(indexPageContent.length);
response.getOutputStream().write(indexPageContent);
}
@Override
public void destroy() {
// nothing to do
}
}