From b4394756f7564ba9b69d21f66cffcf6d70db9bf5 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Tue, 5 Jan 2021 16:48:35 +0100
Subject: Change how redirects are done (any extra string is allowed, and
 redirect if it doesn't match as expected).

---
 org/madore/damlengine/WeblogServlet.java | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/org/madore/damlengine/WeblogServlet.java b/org/madore/damlengine/WeblogServlet.java
index 0f7341c..86f231a 100644
--- a/org/madore/damlengine/WeblogServlet.java
+++ b/org/madore/damlengine/WeblogServlet.java
@@ -89,8 +89,10 @@ public class WeblogServlet extends HttpServlet {
 			String specialName = selRes.getString(3);
 			if ( id != number )
 			    throw new ServletException("this cannot happen");
-			if ( extra != null && ! extra.equals(specialName) )
-			    return new NoSuchPath();
+			if ( ! ( ( extra == null && specialName == null )
+				 || ( extra != null && specialName != null
+				      && extra.equals(specialName) ) ) )
+			    return new SingleBlogEntryRedirectPath(date, id, specialName);
 			long lastModified = (long)(mdate*1000);
 			long thisLastModified;
 			try {
@@ -108,6 +110,7 @@ public class WeblogServlet extends HttpServlet {
 		    throw new ServletException(e);
 		}
 	    }
+	    // Legacy support for an old permalink format:
 	    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;
@@ -151,7 +154,7 @@ public class WeblogServlet extends HttpServlet {
     static final class SingleBlogEntryRedirectPath extends RequestPath {
 	public String date;
 	public int number;
-	public String extra;
+	public String extra;  // May be null (passed to WeblogLink class)
 	public SingleBlogEntryRedirectPath(String date, int number, String extra) {
 	    this.date = date;
 	    this.number = number;
-- 
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