feat: just store handles, to simplify maintenance

fsfe.org/about/people/people.en.xml

@@ -324,7 +324,7 @@
     <function volunteers="web">coordinator/m</function>
     <link>/about/people/tobiasd/tobiasd.html</link>
     <avatar>tobiasd.png</avatar>
-    <fediverse location="https://social.diekershoff.de/xrd?uri=acct:tobias@social.diekershoff.de">tobiasd@fsfe.org</fediverse>
+    <fediverse handle="tobias@social.diekershoff.de">tobiasd@fsfe.org</fediverse>
   </person>
 
   <person id="dietrich">
@@ -629,7 +629,7 @@
     <link>/about/people/kirschner/kirschner.html</link>
     <avatar>kirschner.jpg</avatar>
     <employee>full/m</employee>
-    <fediverse location="https://mastodon.social/.well-known/webfinger?resource=acct:kirschner@mastodon.social">mk@fsfe.org</fediverse>
+    <fediverse handle="kirschner@mastodon.social">mk@fsfe.org</fediverse>
   </person>
 
   <person id="kneissl">

fsfe.org/cgi-bin/webfinger.php

@@ -3,7 +3,6 @@
 $acc_request = strtolower($_GET['resource'] ?? '');
 $xml_file = $_SERVER['DOCUMENT_ROOT'].'about/people/people.en.xml';
 $people = simplexml_load_file($xml_file);
-
 if (false === $people) {
     http_response_code(500);
     echo 'ERROR: Could not load people file. Please check the path:'.$xml_file;
@@ -12,10 +11,14 @@ if (false === $people) {
 }
 
 foreach ($people->xpath('//fediverse') as $fedi_elem) {
-    if ('acct:'.strval($fedi_elem) == $acc_request) {
+    if ('acct:'.strval($fedi_elem) === $acc_request) {
         // if we have a location, return it and exit
-        if (isset($fedi_elem['location'])) {
-            header('Location: '.strval($fedi_elem['location']));
+        if (isset($fedi_elem['handle'])) {
+            // Handles are in the form <username>@<server>
+            $handle = strval($fedi_elem['handle']);
+            $handle_sections = explode('@', $handle);
+            $response = 'Location: https://'.$handle_sections[1].'/.well-known/webfinger?resource=acct:'.$handle;
+            header($response);
 
             exit;
         }