From d00919beaf69c925f6287dbde65ce9fc806f735b Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Sat, 11 Oct 2014 00:26:49 +0200
Subject: Allow for a way to access entries without giving number (redirect).

---
 org/madore/damlengine/WeblogServlet.java | 64 ++++++++++++++++++++++++++++++--
 1 file changed, 60 insertions(+), 4 deletions(-)

(limited to 'org/madore')

diff --git a/org/madore/damlengine/WeblogServlet.java b/org/madore/damlengine/WeblogServlet.java
index 648c12f..444d1ed 100644
--- a/org/madore/damlengine/WeblogServlet.java
+++ b/org/madore/damlengine/WeblogServlet.java
@@ -34,7 +34,7 @@ import javax.servlet.http.HttpServletResponse;
 
 public class WeblogServlet extends HttpServlet {
 
-    private static final long serialVersionUID = 2014101001L;
+    private static final long serialVersionUID = 2014101004L;
 
     @Override
     public void init(ServletConfig cfg)
@@ -60,7 +60,7 @@ public class WeblogServlet extends HttpServlet {
     }
 
     static abstract class RequestPath {
-	public static RequestPath parsePath(String pathInfo)
+	public static RequestPath parsePath(String pathInfo, boolean inGet)
 	    throws ServletException {
 	    Matcher matcher;
 	    if ( pathInfo == null )
@@ -110,6 +110,31 @@ public class WeblogServlet extends HttpServlet {
 		    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 do_single_page=?");
+		    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();
 	}
     }
@@ -125,16 +150,47 @@ public class WeblogServlet extends HttpServlet {
 	}
     }
 
+    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());
+	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;
@@ -155,7 +211,7 @@ public class WeblogServlet extends HttpServlet {
     public long getLastModified(HttpServletRequest request) {
 	final RequestPath rp;
 	try {
-	    rp = RequestPath.parsePath(request.getPathInfo());
+	    rp = RequestPath.parsePath(request.getPathInfo(), false);
 	} catch (Exception e) {
 	    return -1;
 	}
-- 
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