Added redirectors for Bluesky and Fediverse.

public/assets/bsky.js

@@ -0,0 +1,26 @@
+(async () => {
+    const status = document.querySelector('.js-status');
+    status.textContent = 'Looking up DID...';
+
+    const format = BSKY_FORMAT.replace('%s', location.protocol.substring(0, location.protocol.length - 1));
+    let did = null;
+
+    try {
+        const response = await fetch(`${location.protocol}//${BSKY_HANDLE}/.well-known/atproto-did`);
+        did = await response.text();
+    } catch(ex) {
+        status.style.color = 'red';
+        status.textContent = `Could not find DID! ${ex}`;
+        return;
+    }
+
+    if(typeof did !== 'string' || !did.startsWith('did:')) {
+        status.style.color = 'red';
+        status.textContent = 'Look up result was not a valid DID.';
+        return;
+    }
+
+    const url = format.replace('%s', did);
+    status.textContent = `Redirecting to ${url}...`;
+    location.replace(url);
+})();

public/assets/fedi.js

@@ -0,0 +1,39 @@
+(async () => {
+    const status = document.querySelector('.js-status');
+    status.textContent = 'Looking up Fediverse profile...';
+
+    let url = null;
+    try {
+        const response = await fetch(`${location.protocol}//${FEDI_INSTANCE}/.well-known/webfinger?format=json&resource=acct:${FEDI_USERNAME}@${FEDI_INSTANCE}`);
+        const webfinger = await response.json();
+
+        if(typeof webfinger === 'object') {
+            if(Array.isArray(webfinger.links))
+                for(const link of webfinger.links)
+                    if(typeof link === 'object' && link.rel === 'http://webfinger.net/rel/profile-page' && typeof link.href === 'string') {
+                        url = link.href;
+                        break;
+                    }
+
+            if(typeof url !== 'string' && Array.isArray(webfinger.aliases))
+                for(const alias of webfinger.aliases)
+                    if(typeof alias === 'string') {
+                        url = alias;
+                        break;
+                    }
+        }
+    } catch(ex) {
+        status.style.color = 'red';
+        status.textContent = `Could not complete Webfinger lookup! ${ex}`;
+        return;
+    }
+
+    if(typeof url !== 'string' || (!url.startsWith('https://') && !url.startsWith('http://'))) {
+        status.style.color = 'red';
+        status.textContent = 'Could not find an acceptable profile URL.';
+        return;
+    }
+
+    status.textContent = `Redirecting to ${url}...`;
+    location.replace(url);
+})();

src/RedirectorRoutes.php

@@ -49,9 +49,10 @@ final class RedirectorRoutes implements IRouteHandler {
         $this->redirect($response, $request, $info->getString(1));
     }
 
-    private function redirectSimple($response, $request, string $format, string $argument) {
-        $scheme = empty($_SERVER['HTTPS']) ? 'http' : 'https';
-        $argument = rawurlencode($argument);
+    private function redirectSimple($response, $request, string $format, string $argument, bool $forceSecure = false, bool $encodeArgument = true) {
+        $scheme = !$forceSecure && empty($_SERVER['HTTPS']) ? 'http' : 'https';
+        if($encodeArgument)
+            $argument = rawurlencode($argument);
         $url = sprintf($format, $scheme, $argument);
 
         $this->redirect($response, $request, $url);
@@ -77,4 +78,59 @@ final class RedirectorRoutes implements IRouteHandler {
     public function redirectForumPost($response, $request, string $postId) {
         $this->redirectSimple($response, $request, $this->urls->getString('forum_post'), $postId);
     }
+
+    #[HttpGet('/bsky/((did:[a-z0-9]+:[A-Za-z0-9.\-_:%]+)|(([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])))')]
+    public function redirecyBluesky($response, $request, string $handle) {
+        $did = null;
+
+        if(str_starts_with($handle, 'did:'))
+            $did = $handle;
+        else {
+            $timeout = ini_get('default_socket_timeout');
+            try {
+                ini_set('default_socket_timeout', 3);
+                $records = dns_get_record(sprintf('_atproto.%s', $handle), DNS_TXT);
+
+
+                if(is_array($records))
+                    foreach($records as $record)
+                        if(array_key_exists('txt', $record) && str_starts_with($record['txt'], 'did=')) {
+                            $did = trim(substr(trim($record['txt']), 4));
+                            break;
+                        }
+            } finally {
+                ini_set('default_socket_timeout', $timeout);
+            }
+        }
+
+        $format = $this->urls->getString('bsky_profile', '%s://bsky.app/profile/%s');
+        if(is_string($did)) {
+            $this->redirectSimple($response, $request, $format, $did, encodeArgument: false);
+            return;
+        }
+
+        $handle = rawurlencode($handle);
+        echo <<<HTML
+        <!doctype html>
+        <meta charset=utf-8>
+        <title>Redirecting to Bluesky profile...</title>
+        <div class=js-status><noscript>Javascript must be enabled for Bluesky redirects to work.</noscript></div>
+        <script>const BSKY_FORMAT = '{$format}'; const BSKY_HANDLE = decodeURIComponent('{$handle}');</script>
+        <script src="/assets/bsky.js"></script>
+        HTML;
+    }
+
+    #[HttpGet('/fedi/([A-Za-z0-9._%+-]+)@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,})')]
+    public function redirecyFediverse($response, $request, string $userName, string $instance) {
+        $userName = rawurlencode($userName);
+        $instance = rawurlencode($instance);
+        echo <<<HTML
+        <!doctype html>
+        <meta charset=utf-8>
+        <title>Redirecting to Fediverse profile...</title>
+        <div class=js-status><noscript>Javascript must be enabled for Fediverse redirects to work.</noscript></div>
+        <script>const FEDI_USERNAME = '{$userName}'; const FEDI_INSTANCE = decodeURIComponent('{$instance}');</script>
+        <script src="/assets/fedi.js"></script>
+        HTML;
+    }
 }