javaxt-express/src/javaxt/express/cms/WebSite.java at master · javaxt-project/javaxt-express · GitHub

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package javaxt.express.cms;

import javaxt.express.FileManager;

import javaxt.express.utils.Git;

import javaxt.express.utils.MDParser;

import javaxt.http.servlet.*;

import javaxt.http.websocket.*;

import javaxt.utils.Console;

import java.io.IOException;

import java.util.*;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.atomic.AtomicLong;

//******************************************************************************

//** WebSite Servlet

//******************************************************************************

/**

* Servlet used to serve up files and images for a website. HTML pages are

* assembled on-the-fly using an HTML template and content files. Keywords

* in the content files and template are substituted at runtime. Assembled

* files are cached by clients using last modified dates.

******************************************************************************/

public abstract class WebSite extends HttpServlet {

protected static Console console = new Console();

private javaxt.io.Directory web;

private FileManager fileManager;

private javaxt.io.File template;

private Tabs tabs;

private String companyName;

private String companyAcronym;

private String author;

private String keywords;

private Redirects redirects;

private ConcurrentHashMap<String, Content> mdCache;

private Git git;

private ConcurrentHashMap<Long, WebSocketListener> wsListeners;

private AtomicLong wsID;

private ConcurrentHashMap<String, Long> recentSaves; //paths saved via browser, to avoid double-commit

private String[] fileExtensions = new String[]{

".html", ".txt", ".md"

};

/** */

private String[] defaultFileNames = new String[]{

"home", "index", "Overview"

};

private String[] contentFolders = new String[]{

"content",

"documentation", //javaxt.com

"wiki" //legacy

};

//**************************************************************************

//** Constructor

//**************************************************************************

/** Used to instantiate the website.

* @param web Directory that contains html files, css, javascript, images,

* etc. Assumes the template, tabs, and redirects are found in the style

* folder.

* @param servletPath URL path to the website (relative to the hostname).

public WebSite(javaxt.io.Directory web, String servletPath){

this.web = web;

this.template = new javaxt.io.File(web + "style/template.html");

this.tabs = new Tabs(new javaxt.io.File(web + "style/tabs.txt"));

this.redirects = new Redirects(new javaxt.io.File(web + "style/redirects.txt"));

setServletPath(servletPath);

this.fileManager = new FileManager(web);

this.mdCache = new ConcurrentHashMap<>();

this.git = new Git(web);

this.wsListeners = new ConcurrentHashMap<>();

this.wsID = new AtomicLong(0);

this.recentSaves = new ConcurrentHashMap<>();

initFileWatcher();

}

//**************************************************************************

//** Constructor

//**************************************************************************

public WebSite(javaxt.io.Directory web){

this(web, "/");

}

//**************************************************************************

//** getWebDirectory

//**************************************************************************

public javaxt.io.Directory getWebDirectory(){

return web;

}

//**************************************************************************

//** getFileManager

//**************************************************************************

public FileManager getFileManager(){

return fileManager;

}

//**************************************************************************

//** getFileExtensions

//**************************************************************************

/** Returns a list of known/supported file extensions supported by this

* class. Contents of these files will be injected into a template and

* rendered to the client.

public String[] getFileExtensions(){

return fileExtensions;

}

//**************************************************************************

//** setCompanyName

//**************************************************************************

public void setCompanyName(String companyName){

this.setCompanyName(companyName, null);

}

public void setCompanyName(String companyName, String companyAcronym){

this.companyName = companyName;

this.companyAcronym = companyAcronym;

}

//**************************************************************************

//** getCompanyName

//**************************************************************************

public String getCompanyName(){

return companyName;

}

//**************************************************************************

//** setAuthor

//**************************************************************************

public void setAuthor(String author){

this.author = author;

}

//**************************************************************************

//** getAuthor

//**************************************************************************

public String getAuthor(){

return author;

}

//**************************************************************************

//** getCopyright

//**************************************************************************

* extend this class can override this method.

protected String getCopyright(){

}

//**************************************************************************

//** getYear

//**************************************************************************

/** Returns the current year. Commonly used in the copyright text (e.g.

* this method.

protected int getYear(){

return new javaxt.utils.Date().getYear();

}

//**************************************************************************

//** canEdit

//**************************************************************************

/** Returns true if the current request is authorized to edit content files.

* Returns false by default. Override this method to implement access

* control for content editing.

protected boolean canEdit(HttpServletRequest request){

return false;

}

//**************************************************************************

//** beforeSave

//**************************************************************************

/** Called before a content file is saved. Override to validate or transform

* content, or throw an exception to abort the save.

protected void beforeSave(javaxt.io.File file, String content, HttpServletRequest request){}

//**************************************************************************

//** onSave

//**************************************************************************

/** Called after a content file has been saved. Override to add logging,

* notifications, or other post-save actions.

protected void onSave(javaxt.io.File file, HttpServletRequest request){}

//**************************************************************************

//** onFileUpdate

//**************************************************************************

/** Called when a file in the web directory is created, modified, or deleted.

* Detected by the file watcher, not by a browser request. Override to add

* logging, indexing, or other side effects.

* @param file The file that changed.

* @param action One of "CREATE", "UPDATE", or "DELETE".

protected void onFileUpdate(javaxt.io.File file, String action){}

//**************************************************************************

//** processRequest

//**************************************************************************

public void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//Handle WebSocket upgrade

if (request.isWebSocket()){

createWebSocket(request, response);

return;

}

long t = System.currentTimeMillis();

//Redirect as needed

java.net.URL url = request.getURL();

if (redirect(url, response)) return;

//Upgrade to HTTPS if we can...

if (this.supportsHttps()){

response.setHeader("Content-Security-Policy", "upgrade-insecure-requests");

String upgradeRequest = request.getHeader("Upgrade-Insecure-Requests");

if (upgradeRequest!=null && upgradeRequest.equals("1")){

if (!url.getProtocol().equalsIgnoreCase("https")){

String location = url.toString();

location = "https" + location.substring(location.indexOf(":"));

response.setStatus(307);

//response.setHeader("Strict-Transport-Security", "max-age=31536000; includeSubDomains");

response.setHeader("Vary", "Upgrade-Insecure-Requests");

response.setHeader("Location", location);

return;

}

//Get path from URL, excluding servlet path and leading "/" character

String path = getPath(url);

//Special case for Certbot. When generating certificates using the

//certonly command, Certbot creates a hidden directory in the web root.

//The web server must return the files in this hidden directory. However,

//the filemanager does not allow access to hidden directories so we need

//to handle these requests manually.

if (path.startsWith(".well-known")){

console.log(path);

java.io.File file = new java.io.File(web + path);

console.log(file + "\t" + file.exists());

//Send file

if (file.exists()){

response.write(file, javaxt.io.File.getContentType(file.getName()), true);

}

else{

response.setStatus(404);

response.setContentType("text/plain");

}

return;

}

//Send static file if we can

javaxt.io.File file = getFile(path);

if (file!=null){

//Check whether the file ends in a ".html" or ".txt" extension. If so,

//check whether the file is static or if needs to be wrapped

//in a template.

boolean sendFile = true;

String ext = file.getExtension().toLowerCase();

if (ext.equals("html")){

//Don't send html files unless they end with a </html> tag

sendFile = !isSnippet(file);

}

else if (ext.equals("txt")){

//Don't send text files from any of the content folders (e.g. wiki directory)

String filePath = file.getDirectory().toString();

for (String folderName : contentFolders){

int idx = filePath.indexOf("/" + folderName + "/");

if (idx>-1){

sendFile = false;

break;

}

if (sendFile){

sendFile(file, fileManager, request, response);

return;

}

else{

//Check whether the url path ends with a file extension. Return an error

int idx = path.lastIndexOf("/");

if (idx>-1) path = path.substring(idx);

idx = path.lastIndexOf(".");

if (idx>-1){

//console.log(path);

response.sendError(404);

return;

}

//Handle content editing requests

String saveParam = request.getParameter("save");

if (saveParam!=null && saveParam.equals("true")){

if (request.getMethod().equals("POST")){

handleSave(request, response);

return;

}

String sourceParam = request.getParameter("source");

if (sourceParam!=null && sourceParam.equals("true")){

handleSource(request, response);

return;

}

String historyParam = request.getParameter("history");

if (historyParam!=null && historyParam.equals("true")){

handleHistory(request, response);

return;

}

String diffParam = request.getParameter("diff");

if (diffParam!=null && diffParam.length()>0){

handleDiff(request, response, diffParam);

return;

}

String versionParam = request.getParameter("version");

if (versionParam!=null && versionParam.length()>0){

handleVersion(request, response, versionParam);

return;

}

String deleteParam = request.getParameter("delete");

if (deleteParam!=null && deleteParam.equals("true")){

if (request.getMethod().equals("POST")){

handleDelete(request, response);

return;

}

String canEditParam = request.getParameter("canEdit");

if (canEditParam!=null && canEditParam.equals("true")){

response.setStatus(200);

response.setContentType("text/plain");

response.write(canEdit(request) ? "true" : "false");

return;

}

//If we're still here, generate html response

sendHTML(request, response);

//console.log("processRequest", System.currentTimeMillis()-t);

}

//**************************************************************************

//** sendFile

//**************************************************************************

/** Used to send a static file to the client (e.g. css, javascript, images,

* zip files, etc). By default, this method simple calls the following:

<pre>

fileManager.sendFile(file, request, response);

</pre>

* Callers can override this method and add additional logic (e.g. auditing,

* authorization, logging, etc).

protected void sendFile(javaxt.io.File file, FileManager fileManager,

HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

fileManager.sendFile(file, request, response);

}

//**************************************************************************

//** getPath

//**************************************************************************

/** Returns the path part of a url, excluding servlet path and leading "/"

* character

private String getPath(java.net.URL url){

String path = url.getPath();

String servletPath = getServletPath();

if (!servletPath.endsWith("/")) servletPath += "/";

path = path.substring(path.indexOf(servletPath)).substring(servletPath.length());

if (path.startsWith("/")) path = path.substring(1);

return path;

}

//**************************************************************************

//** getFile

//**************************************************************************

/** Returns a path to a static file (e.g. css, javascript, images, zip, etc)

private javaxt.io.File getFile(String path){

//Restrict access to the "bin" directory

if (path.toLowerCase().startsWith("bin/")){

return null;

}

//Construct a list of possible file paths

ArrayList<String> files = new ArrayList<>();

files.add(path);

files.add("downloads/" + path);

//Loop through possible file combinations

for (String str : files){

java.io.File file = fileManager.getFile(str);

if (file!=null) return new javaxt.io.File(file);

}

return null;

}

//**************************************************************************

//** sendHTML

//**************************************************************************

/** Used to construct an html document from a template and an html snippet.

private void sendHTML(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

long t = System.currentTimeMillis();

String servletPath = getServletPath();

if (!servletPath.endsWith("/")) servletPath += "/";

//Get the html file

java.net.URL url = request.getURL();

javaxt.io.File file = getHtmlFile(url); //<--Watch for NPE!

//Check whether the client wants the raw file content or if we should

//wrap the content in a template (default).

boolean useTemplate = true;

String templateParam = request.getParameter("template");

if (templateParam!=null){

if (templateParam.equals("false")){

useTemplate = false;

}

if (useTemplate){

if (template==null || !template.exists()) useTemplate = false;

}

//Calculate last modified date and estimated file fize

TreeSet<Long> dates = new TreeSet<>();

if (file!=null) dates.add(file.getDate().getTime());

if (useTemplate){

dates.add(template.getDate().getTime());

dates.add(tabs.getLastModified());

}

//Get content

Content content = getContent(request, file);

if (content==null) content = getPartialIndex(request);

if (content==null) content = getPageNotFound(request);

dates.add(content.getDate().getTime());

String html = content.getHTML();

//Update HTML. Note that there are currently two major bottlenecks here:

//(1) html parser in "useTemplate" block and (2) the updateLinks method

//Both can be mitigated with some simple caching

long t0 = System.currentTimeMillis();

if (useTemplate){

//Instantiate html parser

long t1 = System.currentTimeMillis();

javaxt.html.Parser document = new javaxt.html.Parser(html);

//Extract Title

String title = null;

try{

javaxt.html.Element el = document.getElementByTagName("title");

html = html.replace(el.getOuterHTML(), "");

title = el.getInnerText().trim();

}

catch(Exception e){}

if (title==null){

try{

title = document.getElementByTagName("h1").getInnerHTML();

}

catch(Exception e){}

}

if (title==null){

if (companyName!=null && companyAcronym!=null){

title = companyAcronym + " - " + companyName;

}

else{

if (file!=null){

title = file.getName(false);

for (String fileName : defaultFileNames){

if (title.equalsIgnoreCase(fileName)){

title = file.getDirectory().getName();

break;

}

if (title==null) title = "";

//Extract Description

String description = null;

try{

javaxt.html.Element el = document.getElementByTagName("description");

html = html.replace(el.getOuterHTML(), "");

description = el.getInnerHTML();

}

catch(Exception e){}

if (description==null) description = "";

//Extract Keywords

String keywords = null;

try{

javaxt.html.Element el = document.getElementByTagName("keywords");

html = html.replace(el.getOuterHTML(), "");

keywords = el.getInnerHTML();

}

catch(Exception e){}

if (keywords==null) keywords = this.keywords;

if (keywords==null) keywords = "";

//console.log("parser", System.currentTimeMillis()-t1);

html = template.getText().replace("<%=content%>", html);

html = html.replace("<%=title%>", title);

html = html.replace("<%=description%>", description);

html = html.replace("<%=keywords%>", keywords);

html = html.replace("<%=author%>", author==null ? "" : author);

html = html.replace("<%=companyName%>", companyName==null ? "": companyName);

html = html.replace("<%=year%>", getYear()+"");

html = html.replace("<%=copyright%>", getCopyright());

html = html.replace("<%=tabs%>", getTabs(url.getPath(), tabs));

html = html.replace("<%=breadcrumbs%>", getBreadcrumbs(request));

html = html.replace("<%=sidebar%>", getSidebar(request));

html = html.replace("<%=Path%>", servletPath);

html = updateLinks(html, dates, template);

//console.log("useTemplate", System.currentTimeMillis()-t0);

}

else{

html = html.replace("<%=Path%>", servletPath);

html = updateLinks(html, dates, file);

//console.log("updateLinks", System.currentTimeMillis()-t0);

}

//Remove any orphan tags

if (html.contains("<%=") && html.contains("%>")){

StringBuilder str = new StringBuilder();

String[] arr = html.split("<%=");

for (int i=0; i<arr.length; i++){

String s = arr[i];

if (i>0){

int idx = s.indexOf("%>");

if (idx>-1) s = s.substring(idx+2);

}

str.append(s);

}

html = str.toString();

}

//Trim the html

html = html.trim();

//console.log("html", System.currentTimeMillis()-t);

//Get last modified date

long lastModified = dates.last();

//Set response headers

response.setStatus(content.getStatusCode());

response.setContentType("text/html");

//Send response

response.write(html, lastModified);

//console.log("sendHTML", System.currentTimeMillis()-t);

}

//**************************************************************************

//** updateLinks

//**************************************************************************

/** Updates links in "script" and "link" tags with a querystring representing

* the last modified date of the file.

private String updateLinks(String html, TreeSet<Long> dates, javaxt.io.File htmlFile){

//Generate a list of supported tags

HashMap<String, String> tagsWithLinks = new HashMap();

tagsWithLinks.put("script", "src");

tagsWithLinks.put("link", "href");

//Get elements that match the supported tags

ArrayList<javaxt.html.Element> elements = new ArrayList<>();

javaxt.html.Parser document = new javaxt.html.Parser(html);

for (String tagName : tagsWithLinks.keySet()){

String linkAttr = tagsWithLinks.get(tagName);

for (javaxt.html.Element el : document.getElementsByTagName(tagName)){

String url = el.getAttribute(linkAttr);

if (!(url==null || url.isEmpty())){

String t = url.toLowerCase();

if (!t.startsWith("http://") && !t.startsWith("https://") && !t.startsWith("//")){

elements.add(el);

}

if (elements.isEmpty()) return html;

//Generate an XML document

StringBuilder str = new StringBuilder();

str.append("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\r\n");

str.append("<links>");

for (javaxt.html.Element el : elements){

str.append("\r\n");

str.append(el.toString());

if (!el.isClosed()){

str.append("</" + el.getName() + ">");

}

str.append("\r\n</links>");

org.w3c.dom.Document xml = javaxt.xml.DOM.createDocument(str.toString());

//Update links in the XML

try{

long lastUpdate = fileManager.updateLinks(htmlFile, xml);

dates.add(lastUpdate);

}

catch(Exception e){

throw new RuntimeException(e);

}

//Update html document

org.w3c.dom.Node outerNode = javaxt.xml.DOM.getOuterNode(xml);

org.w3c.dom.Node[] nodes = javaxt.xml.DOM.getNodes(outerNode.getChildNodes());

for (int i=0; i<nodes.length; i++){

org.w3c.dom.Node node = nodes[i];

String orgTag = elements.get(i).getOuterHTML();

String newTag = javaxt.xml.DOM.getText(node);

//Replace any self-enclosing script tags as needed

String nodeName = node.getNodeName().toLowerCase();

if (newTag.endsWith("/>") && nodeName.equals("script")){

newTag = newTag.substring(0, newTag.length()-2);

newTag += "></" + nodeName + ">";

}

html = html.replace(orgTag, newTag);

}

return html;

}

//**************************************************************************

//** getContent

//**************************************************************************

/** Returns an html snippet found in the given file. This method can be

* overridden to generate dynamic content or to support custom tags.

protected Content getContent(HttpServletRequest request, javaxt.io.File file){

if (file==null || !file.exists()){

return null;

}

else{

String txt = file.getText("UTF-8");

String ext = file.getExtension();

java.util.Date date = file.getDate();

Content content;

if (ext.equalsIgnoreCase("md")){

String key = file.toString().replace(web.toString(), "");

synchronized(mdCache){

Content cached = mdCache.get(key);

if (cached!=null){

if (!date.after(cached.getDate())){

return cached;

}

String html = MDParser.toHTML(txt);

content = new Content(html, date);

mdCache.put(key, content);

}

else{

content = new Content(txt, date);

}

return content;

}

//**************************************************************************

//** getHtmlFile

//**************************************************************************

/** Maps the requested URL to an html snippet found in an html or txt file.

* Returns null if suitable a file is not found.

private javaxt.io.File getHtmlFile(java.net.URL url){

//Get path from url

String path = url.getPath();

String servletPath = getServletPath();

if (!servletPath.endsWith("/")) servletPath += "/";

path = path.substring(path.indexOf(servletPath)).substring(servletPath.length());

//Remove leading and trailing "/" characters

if (path.startsWith("/")) path = path.substring(1);

if (path.endsWith("/")) path = path.substring(0, path.length()-1);

//Check whether the url points directly to a file (minus the file extension)

//or if the url points to a directory. If so, return the file.

String folderPath = web.toString();

javaxt.io.File file = getFile(path, folderPath);

if (file!=null) return file;

//If we are still here, check whether the url is missing a content folder

//in its path (e.g. "documentation", "wiki").

for (String folderName : contentFolders){

folderPath = web + folderName + "/";

file = getFile(path, folderPath);

if (file!=null) return file;

}

return null;

}

//**************************************************************************

//** getFile

//**************************************************************************

private javaxt.io.File getFile(String path, String folderPath){

//Check whether the url points directly to a file (minus the file extension)

if (path.length()>0){

//System.out.println("Checking: " + folderPath + path + ".*");

for (String fileExtension : fileExtensions){

javaxt.io.File file = new javaxt.io.File(folderPath + path + fileExtension);

if (file.exists()){

if (isSnippet(file)) return file;

}

//Check whether the url points to a directory. If so, check whether the

//directory has a welcome file (e.g. index.html, Overview.txt, etc).

javaxt.io.Directory dir = new javaxt.io.Directory(folderPath + path);

//System.out.println("Search: " + dir + " <--" + dir.exists());

if (dir.exists()){

for (String fileName : defaultFileNames){

for (String fileExtension : fileExtensions){

javaxt.io.File file = new javaxt.io.File(dir, fileName + fileExtension);

if (file.exists()){

if (isSnippet(file)) return file;

}

return null;

}

//**************************************************************************

//** isSnippet

//**************************************************************************

private boolean isSnippet(javaxt.io.File file){

String ext = file.getExtension();

if (ext!=null && ext.equalsIgnoreCase("md")) return true;

String str = file.getText("UTF-8").trim();

return !str.endsWith("</html>");

}

//**************************************************************************

//** getIndex

//**************************************************************************

/** Returns an html snippet with paths to all the html/txt files found in

* the given file path. Note that the file date is updated to reflect the

* most current file.

protected Content getIndex(javaxt.io.File file){

return getIndex(file.getDirectory(), file);

}

//**************************************************************************

//** getIndex

//**************************************************************************

/** Returns an html snippet with links to all the content files found under

* the given directory (recursively). The optional "exclude" file (e.g. the

* index file itself) is omitted from the listing. When an "exclude" file is

* given, the listing is treated as a full index page and the top-most

* directory of each branch is rendered as an "h2" heading. Otherwise (e.g.

* the "not found" subtree, called with a null exclude) every directory is

* rendered as a plain list item.

protected Content getIndex(javaxt.io.Directory dir, javaxt.io.File exclude){

//Render "h2" headers only for full index pages, which are identified by

//having an index file to exclude; bare subtrees use plain list items.

boolean useHeaders = exclude!=null;

//Get relative path to the directory

String path = dir.toString();

path = path.substring(web.toString().length());

path = path.replace("\\", "/");

if (!path.startsWith("/")) path = "/" + path;

if (!path.endsWith("/")) path += "/";

//Generate list of files and dates

List<javaxt.io.File> files = new LinkedList<>();

TreeSet<Long> dates = new TreeSet<>();

dates.add((exclude!=null ? exclude.getDate() : dir.getDate()).getTime());

for (javaxt.io.File f : dir.getFiles(fileExtensions, true)){

if (exclude==null || !f.equals(exclude)){

files.add(f);

dates.add(f.getDate().getTime());

}

//Build table of contents using ul/li tags

StringBuilder toc = new StringBuilder();

toc.append("<ul>\r\n");

String[] prevDirs = new String[0];

int len = dir.getPath().length();

for (javaxt.io.File f : files){

String fileName = f.getName(false);

//Get the file's directory relative to the index directory,

//normalized to forward slashes with no leading slash and a

//trailing slash (e.g. "sql/ConnectionPool/")

String relPath = f.getDirectory().getPath().substring(len).replace("\\", "/");

if (relPath.startsWith("/")) relPath = relPath.substring(1);

if (relPath.length()>0 && !relPath.endsWith("/")) relPath += "/";

String[] currDirs = relPath.length()==0 ? new String[0] : relPath.split("/");

//Find how many leading directories the previous and current paths share

int common = 0;

while (common<prevDirs.length && common<currDirs.length &&

prevDirs[common].equals(currDirs[common])){

common++;

}

//Close the directories that are no longer part of the current path

for (int i=prevDirs.length; i>common; i--){

toc.append("</ul>\r\n");

}

//Open the directories that are new to the current path, emitting a

//header for each level (an "h2" for the top-most level)

for (int i=common; i<currDirs.length; i++){

String dirName = currDirs[i];

String tag = (useHeaders && i==0) ? "h2" : null;

toc.append("<li>");

if (tag!=null) toc.append("<" + tag + ">");

toc.append(dirName.replace("_", " "));

if (tag!=null) toc.append("</" + tag + ">");

toc.append("</li>\r\n");

toc.append("<ul>\r\n");

}

//Append a link to the file

String link = path + relPath + fileName;

toc.append("<li><a href=\"" + link + "\">" + fileName.replace("_", " ") + "</a></li>\r\n");

prevDirs = currDirs;

}

//Close any directories that are still open

for (int i=prevDirs.length; i>0; i--){

toc.append("</ul>\r\n");

}

toc.append("</ul>\r\n");

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javaxt-express/src/javaxt/express/cms/WebSite.java at master · javaxt-project/javaxt-express · GitHub

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