implement webfinger lookups

4 files changed, 53 insertions, 6 deletions

diff --git a/WpfTest/Model/Actor.php b/WpfTest/Model/Actor.php
index 0b0e729..a745a96 100644
--- a/WpfTest/Model/Actor.php
+++ b/WpfTest/Model/Actor.php
@@ -4,6 +4,8 @@ namespace WpfTest\Model;
 use WpfTest\RemoteFetchable;
 
 class Actor extends FetchableModel implements \JsonSerializable {
+    public const REL_URI = "https://pawpub.entities.org.uk/rel/actor.html";
+
     public ?int $id;
     public string $uri;
     public bool $isLocal = false;
@@ -32,6 +34,37 @@ class Actor extends FetchableModel implements \JsonSerializable {
         return self::findWhere('is_local = true AND handle = ?', [$handle]);
     }
 
+    public static function findByWebfinger(string $acct, bool $autoSave = true, bool $forceRefetch = false): ?self {
+        // normalise uri
+        if (!str_starts_with($acct, 'acct:')) {
+            if (str_starts_with($acct, '@')) {
+                $acct = substr($acct, 1);
+            }
+            $acct = "acct:$acct";
+        }
+        // fetch it
+        $domain = explode('@', $acct, 2)[1];
+        $data = @file_get_contents("https://$domain/.well-known/webfinger?resource=$acct",
+            context: stream_context_create([
+                'http' => ['header' => 'Accept: application/jrd+json, application/json']
+            ])
+        );
+        if ($data === false)
+            return null;
+        $data = json_decode($data);
+        if ($data === null)
+            return null;
+        // find the right link
+        if (!isset($data->links))
+            return null;
+        $matching = array_filter($data->links, function (\stdClass $linkObj) {
+            return $linkObj->rel == self::REL_URI;
+        });
+        if (count($matching) == 0)
+            return null;
+        return self::findByUri($matching[0]->href, $autoSave, $forceRefetch);
+    }
+
     public function jsonSerialize(): array {
         return [
             'type' => 'actor',
diff --git a/WpfTest/Model/FetchableModel.php b/WpfTest/Model/FetchableModel.php
index 44106d4..5dce010 100644
--- a/WpfTest/Model/FetchableModel.php
+++ b/WpfTest/Model/FetchableModel.php
@@ -21,7 +21,7 @@ abstract class FetchableModel extends Model implements RemoteFetchable {
         if ($data === false)
             return null;
         $data = json_decode($data);
-        if ($data === false)
+        if ($data === null)
             return null;
         // default everything nullable to null
         $obj = new static();
diff --git a/bin/shell b/bin/shell
new file mode 100755
index 0000000..d699a14
--- /dev/null
+++ b/bin/shell
@@ -0,0 +1,12 @@
+#!/bin/sh
+# set up autoloads<?php echo "\n"; goto skipShell; ?>
+cd "$(dirname "$0")/../" || exit 1
+php -a -d auto_prepend_file=bin/shell
+exit
+
+<?php skipShell:
+require __DIR__ . '/../vendor/autoload.php';
+foreach (glob(__DIR__ . '/../misc/*.php') as $filename) {
+    require $filename;
+}
+
diff --git a/routes/webfinger.php b/routes/webfinger.php
index 4445cad..db29e73 100644
--- a/routes/webfinger.php
+++ b/routes/webfinger.php
@@ -3,6 +3,7 @@
 use WpfTest\GlobalConfig;
 use WpfTest\HttpResponseStatus\BadRequest;
 use WpfTest\HttpResponseStatus\NotFound;
+use WpfTest\Model\Actor;
 use WpfTest\Router;
 
 Router::getInstance()->mount('/.well-known/webfinger', function (array $args) {
@@ -18,15 +19,16 @@ Router::getInstance()->mount('/.well-known/webfinger', function (array $args) {
     if ($remotePart != GlobalConfig::getInstance()->getCanonicalHost()) {
         throw new NotFound('i only know about local accounts');
     }
-    if ($localPart != 'winter') {
-        throw new NotFound('i only know about winter!!!');
+    $actor = Actor::findLocalByHandle($localPart);
+    if ($actor == null) {
+        throw new NotFound('no local actor found with that name!');
     }
     json_response([
-        'subject' => "acct:$localPart@$remotePart",
+        'subject' => "acct:$actor->handle@$remotePart",
         'links' => [
             [
-                'rel' => 'urn:example:wpf:actor',
-                'href' => path_to_uri('/user/winter'),
+                'rel' => Actor::REL_URI,
+                'href' => path_to_uri("/user/$actor->handle"),
                 'type' => 'application/json'
             ]
         ]