From 0a48cd756788223be5a2c1c3865b65fb9a8476c8 Mon Sep 17 00:00:00 2001
From: Jakub Czajka <jczajka@google.com>
Date: Sun, 12 May 2024 00:57:41 +0200
Subject: [PATCH] Serve last modification date through an endpoint and SSI.

---
 index.html   | 15 +++++++--------
 revision.sh  | 11 +++++++++++
 website.conf |  8 ++++++++
 3 files changed, 26 insertions(+), 8 deletions(-)
 create mode 100755 revision.sh

diff --git a/index.html b/index.html
index f8c387d..fd5dba4 100644
--- a/index.html
+++ b/index.html
@@ -44,14 +44,13 @@
   </div>
   <div class="bottom-container">
     <p>Modified:&nbsp;</p>
-    <p id='modified' />
-      <script>
-        var last_modified_timestamp = new Date(document.lastModified);
-        var last_modified = last_modified_timestamp.getFullYear() + '/'
-          + last_modified_timestamp.getMonth() + '/'
-          + last_modified_timestamp.getDate()
-        document.getElementById('modified').innerHTML = last_modified;
-      </script>
+    <p>
+      <iframe src="/revision<!--#echo var='content' -->"
+              frameborder=0
+              marginheight=0
+              marginwidth=0>
+      </iframe>
+    </p>
     <p>Views:&nbsp;</p>
     <p>
       <iframe src="/views<!--#echo var='request_uri' -->"
diff --git a/revision.sh b/revision.sh
new file mode 100755
index 0000000..1768eff
--- /dev/null
+++ b/revision.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+# Copyright (c) 2024 Jakub Czajka <jakub@ekhem.eu.org>
+# License: GPL-3.0 or later.
+
+. /etc/environment
+
+echo "HTTP/1.1 200 OK"
+echo "Content-Type: text/html"
+echo ""
+
+/usr/bin/date --reference="${URL}" --iso-8601=date
diff --git a/website.conf b/website.conf
index 26c16e9..9093867 100644
--- a/website.conf
+++ b/website.conf
@@ -38,6 +38,14 @@ server {
         fastcgi_param SCRIPT_FILENAME ${dollar}document_root/views.sh;
     }
 
+    location ~ /revision/(.*)$ {
+        include fastcgi_params;
+        fastcgi_pass unix:/var/run/fcgiwrap.socket;
+
+        fastcgi_param URL ${dollar}1.html;
+        fastcgi_param SCRIPT_FILENAME ${dollar}document_root/revision.sh;
+    }
+
     location /cv {
         root ${prod_dir}/cv;
         rewrite ^ /cv.pdf break;
-- 
2.39.5