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package org.madore.damlengine;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.Properties;
import java.util.Enumeration;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/* Thinkos about the mess that is tomcat:
* - Make sure that /usr/share/java/postgresql-jdbc4.jar (or whatever
* contains the class org.postgresql.Driver) is symlinked from
* /var/lib/tomcat7/common (or some path listed in the common.loader
* property of the catalina.properties file). Similarly,
* xercesImpl.jar and probably xml-resolver.jar need to be linked.
* - The following parameters need to be defined in <init-param> tags
* inside the <servlet> block: base_path, template_path, pghost,
* pgport, dbname, pguser and pgpass or pgpassfile.
*/
public class WeblogServlet extends HttpServlet {
private static final long serialVersionUID = 2014101204L;
@Override
public void init(ServletConfig cfg)
throws ServletException
{
super.init(cfg); // Important!
synchronized ( DamlEngine.class ) { if ( DamlEngine.appProps == null ) {
DamlEngine.runAsServlet = true;
DamlEngine.appProps = new Properties();
for (Enumeration<String> e = cfg.getInitParameterNames() ; e.hasMoreElements() ; ) {
String k = e.nextElement();
DamlEngine.appProps.setProperty(k, cfg.getInitParameter(k));
}
if ( DamlEngine.appProps.getProperty("base_path") != null )
DamlEngine.basePath = Paths.get(DamlEngine.appProps.getProperty("base_path"));
if ( DamlEngine.basePath == null )
DamlEngine.basePath = Paths.get(getServletContext().getRealPath("/"));
if ( DamlEngine.appProps.getProperty("template_path") != null )
DamlEngine.templatePath = Paths.get(DamlEngine.appProps.getProperty("template_path"));
if ( DamlEngine.templatePath == null )
DamlEngine.templatePath = DamlEngine.basePath.resolve("templates");
} }
}
static abstract class RequestPath {
public static RequestPath parsePath(String pathInfo, boolean inGet)
throws ServletException {
Matcher matcher;
if ( pathInfo == null )
return new NoSuchPath();
if ( (matcher=Pattern.compile("/d\\.(\\d{4}-\\d{2}-\\d{2})\\.(\\d{4})(?:\\.([\\p{Alnum}\\-]*))?\\.html").matcher(pathInfo)).matches() ) {
final String date;
final int number;
final String extra;
try {
date = matcher.group(1);
number = Integer.parseInt(matcher.group(2));
extra = matcher.group(3);
} catch (NumberFormatException e) {
return new NoSuchPath();
}
try {
final Connection conn = WeblogDatabaseConnection.getConnection();
final PreparedStatement selSt
= conn.prepareStatement("SELECT id , extract(epoch from mdate) , special_name FROM entries WHERE edate=? AND id=?");
selSt.setString(1,date);
selSt.setInt(2,number);
final ResultSet selRes = selSt.executeQuery();
if ( selRes.next() ) {
int id = selRes.getInt(1);
double mdate = selRes.getDouble(2);
String specialName = selRes.getString(3);
if ( id != number )
throw new ServletException("this cannot happen");
if ( extra != null && ! extra.equals(specialName) )
return new NoSuchPath();
long lastModified = (long)(mdate*1000);
long thisLastModified;
try {
// Attempts to detect when *this* class was last modified.
thisLastModified = WeblogServlet.class.getResource("WeblogServlet.class").openConnection().getLastModified();
} catch (Exception e) {
thisLastModified = 0;
}
if ( thisLastModified > lastModified )
lastModified = thisLastModified;
return new SingleBlogEntryPath(number, lastModified);
} else
return new NoSuchPath();
} catch (SQLException e) {
throw new ServletException(e);
}
}
if ( inGet && (matcher=Pattern.compile("/d\\.(\\d{4}-\\d{2}-\\d{2})\\.([\\p{Alpha}][\\p{Alnum}\\-]*)\\.html").matcher(pathInfo)).matches() ) {
final String date;
final String extra;
try {
date = matcher.group(1);
extra = matcher.group(2);
} catch (NumberFormatException e) {
return new NoSuchPath();
}
try {
final Connection conn = WeblogDatabaseConnection.getConnection();
final PreparedStatement selSt
= conn.prepareStatement("SELECT id FROM entries WHERE edate=? AND special_name=?");
selSt.setString(1,date);
selSt.setString(2,extra);
final ResultSet selRes = selSt.executeQuery();
if ( selRes.next() ) {
int id = selRes.getInt(1);
return new SingleBlogEntryRedirectPath(date, id, extra);
} else
return new NoSuchPath();
} catch (SQLException e) {
throw new ServletException(e);
}
}
return new NoSuchPath();
}
}
static final class NoSuchPath extends RequestPath { }
static final class SingleBlogEntryPath extends RequestPath {
public int number;
public long lastModified;
public SingleBlogEntryPath(int number, long lastModified) {
this.number = number;
this.lastModified = lastModified;
}
}
static final class SingleBlogEntryRedirectPath extends RequestPath {
public String date;
public int number;
public String extra;
public SingleBlogEntryRedirectPath(String date, int number, String extra) {
this.date = date;
this.number = number;
this.extra = extra;
}
}
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
final RequestPath rp = RequestPath.parsePath(request.getPathInfo(), true);
if ( rp instanceof NoSuchPath ) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
if ( rp instanceof SingleBlogEntryRedirectPath ) {
SingleBlogEntryRedirectPath rrp = (SingleBlogEntryRedirectPath)rp;
Matcher matcher = Pattern.compile("(\\d{4})-(\\d{2})-(\\d{2})").matcher(rrp.date);
if ( ! matcher.matches() )
throw new AssertionError("bad date format");
WeblogLink lk = new WeblogLink(matcher.group(1), matcher.group(2),
matcher.group(3),
String.format("%04d", rrp.number),
"", rrp.extra);
lk.setTypeStandard();
String basePath = request.getScheme() + "://"
+ request.getServerName()
+ ":" + request.getServerPort()
+ request.getContextPath()
+ "/";
// response.sendRedirect(lk.getFile(basePath));
response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
response.setHeader("Location", lk.getFile(basePath));
return;
}
if ( ! (rp instanceof SingleBlogEntryPath) )
throw new ServletException("this cannot happen");
final int number = ((SingleBlogEntryPath)rp).number;
response.setContentType("text/html; charset=utf-8");
response.setCharacterEncoding("UTF-8");
OutputStream out = response.getOutputStream();
try {
Context.DynamicContext dc = new Context.DynamicContext();
dc.modTime = ((SingleBlogEntryPath)rp).lastModified;
WeblogSelect.fullProcess(new Context.WeblogSingleSelectionContext(number),
dc, out);
} catch (Exception e) {
throw new ServletException("exception during WeblogSelect.fullProcess()", e);
}
}
@Override
public long getLastModified(HttpServletRequest request) {
final RequestPath rp;
try {
rp = RequestPath.parsePath(request.getPathInfo(), false);
} catch (Exception e) {
return -1;
}
if ( rp instanceof SingleBlogEntryPath ) {
final long lastModified = ((SingleBlogEntryPath)rp).lastModified;
return (lastModified/1000)*1000;
}
return -1;
}
}
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