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com.centurylink.mdw.hub.servlet.NotFoundServlet Maven / Gradle / Ivy
/*
* Copyright (C) 2017 CenturyLink, 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 com.centurylink.mdw.hub.servlet;
import com.centurylink.mdw.app.ApplicationContext;
import com.centurylink.mdw.common.MdwException;
import com.centurylink.mdw.config.PropertyManager;
import com.centurylink.mdw.constant.PropertyNames;
import com.centurylink.mdw.hub.context.Mdw;
import com.centurylink.mdw.hub.context.Page;
import com.centurylink.mdw.hub.context.WebAppContext;
import com.centurylink.mdw.util.ExpressionUtil;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
/**
* Overrides 404 handling to check for matching asset content.
* TODO: Only UI page requests should be handled here. JS and CSS
* requests should continue to return 404 status to browser/caller.
*/
@WebServlet(urlPatterns={"/404"}, loadOnStartup=1)
public class NotFoundServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String assetPath = request.getParameter("missingAsset");
if (assetPath != null) {
serveMissingAssetPage(request, response, assetPath);
}
else {
String path = (String) request.getAttribute("javax.servlet.forward.servlet_path");
if (path != null) {
if (path.endsWith("/images/tab_sel.png")) { // hack for nav back from Task UI
response.sendRedirect(ApplicationContext.getMdwHubUrl() + "/images/tab_sel.png");
return;
}
if (path.endsWith("/mdw.ico")) { // hack for nav back from Task UI
response.sendRedirect(ApplicationContext.getMdwHubUrl() + "/images/mdw.ico");
return;
}
if (path.startsWith("/staging") || path.startsWith("/milestones")
|| (path.indexOf('.') == -1 && path.indexOf('#') == -1 && path.startsWith("/tasks"))) {
String redirectPath = path;
String[] pathSegs = path.substring(1).split("/");
if (pathSegs.length > 2)
redirectPath = "/" + pathSegs[0] + "/" + pathSegs[1];
response.sendRedirect(ApplicationContext.getMdwHubUrl() + "/#" + redirectPath);
return;
}
if (path.startsWith("/edit/")) {
// TODO implement asset editing in React
response.sendRedirect(ApplicationContext.getMdwHubUrl() + "/#" + path);
return;
}
if (path.startsWith("/dashboard/")) {
// shortcut for standalone dashboard app
path = "/com/centurylink/mdw/dashboard/Index";
}
Mdw mdw = WebAppContext.getMdw();
Page page = findPage(mdw, path);
if (!page.exists()) {
String rootPkg = PropertyManager.getProperty(PropertyNames.MDW_HUB_ROOT_PACKAGE);
if (rootPkg != null)
page = findPage(mdw, "/" + rootPkg.replace('\\', '/') + path);
}
if (page.exists()) {
response.setContentType("text/html");
if (page.getAsset().shouldCache(request.getHeader("If-None-Match"))) {
response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
} else {
response.setHeader("ETag", page.getAsset().getETag());
InputStream in = null;
OutputStream out = response.getOutputStream();
try {
if (page.getExt().equals("md")) {
// TODO: render markdown to html
} else if (page.getTemplate() != null) {
String html = new String(Files.readAllBytes(Paths.get(page.getTemplateAsset().getFile().getPath())));
in = new ByteArrayInputStream(ExpressionUtil.substitute(html, page, true).getBytes());
} else {
in = new FileInputStream(page.getFile());
}
int read;
byte[] bytes = new byte[1024];
if (in != null)
while ((read = in.read(bytes)) != -1)
out.write(bytes, 0, read);
} catch (MdwException ex) {
throw new IOException(ex.getMessage(), ex);
} finally {
if (in != null)
in.close();
response.setStatus(HttpServletResponse.SC_OK);
}
}
return;
}
else if (path.equals("/com/centurylink/mdw/dashboard/Index")) {
String unfoundAsset = path.substring(1, path.lastIndexOf('/')).replace('/', '.');
String redirect = "/404?missingAsset=" + URLEncoder.encode(unfoundAsset, "utf-8");
request.getRequestDispatcher(redirect).forward(request, response);
return;
}
}
request.getRequestDispatcher("/error/404.html").forward(request, response);
}
}
private Page findPage(Mdw mdw, String path) {
Page page = new Page(mdw, path);
if (!page.exists()) {
if (page.getExt() == null) {
// try appending supported page extensions
page = new Page(mdw, path + ".html");
if (!page.exists()) {
page = new Page(mdw, path + ".md");
}
if (!page.exists()) {
String assetPath = path;
if (assetPath.endsWith("/"))
assetPath = assetPath.substring(0, assetPath.length() - 1);
int lastSlash = assetPath.lastIndexOf('/');
String pkgPath = assetPath.substring(0, lastSlash);
String name = assetPath.substring(lastSlash + 1);
page = new Page(mdw, pkgPath + "/" + name.substring(0, 1).toUpperCase() + name.substring(1) + ".jsx");
if (!page.exists()) {
Page ancestor = new Page(mdw, path).findAncestor("Index.jsx");
if (ancestor != null)
page = ancestor;
}
if (page.exists()) {
// standalone jsx path (without extension): set template html
page.setTemplate("com/centurylink/mdw/react/index.html");
}
}
}
if (!page.exists()) {
// allow 404 override
page = new Page(mdw, "/error/404.html");
}
}
return page;
}
private void serveMissingAssetPage(HttpServletRequest request, HttpServletResponse response, String assetPath)
throws IOException {
File htmlFile;
if (ApplicationContext.isSpringBoot()) {
// pure spring boot
htmlFile = new File(ApplicationContext.getDeployPath() + "/hub/error/noAsset.html");
if (!htmlFile.exists())
htmlFile = new File(ApplicationContext.getDeployPath() + "/web/error/noAsset.html");
}
else {
htmlFile = new File(request.getServletContext().getRealPath("error/noAsset.html"));
}
String html = new String(Files.readAllBytes(htmlFile.toPath()));
Map data = new HashMap<>();
data.put("assetPath", assetPath);
int slash = assetPath.indexOf('/');
String packageName = slash > 0 ? assetPath.substring(0, assetPath.indexOf('/')) : assetPath;
data.put("packageName", packageName);
data.put("packagePath", packageName.replace('.', '/'));
data.put("contextRoot", ApplicationContext.getMdwHubContextRoot());
try {
html = ExpressionUtil.substitute(html, data, true).replace('\n', ' ');
response.setContentType("text/html");
response.getWriter().println(html);
}
catch (MdwException ex) {
throw new IOException(ex);
}
}
}
