Initial commit to new repo

app/Jobs/SendWebMentions.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace App\Jobs;
+
+use GuzzleHttp\Client;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+class SendWebMentions extends Job implements ShouldQueue
+{
+    use InteractsWithQueue, SerializesModels;
+
+    protected $url;
+    protected $source;
+
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct($url, $source)
+    {
+        $this->url = $url;
+        $this->source = $source;
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle(Client $client)
+    {
+        $endpoint = $this->discoverWebmentionEndpoint($this->url, $client);
+        if ($endpoint) {
+            $client->post($endpoint, [
+                'form_params' => [
+                    'source' => $this->source,
+                    'target' => $this->url,
+                ],
+            ]);
+        }
+    }
+
+    /**
+     * Discover if a URL has a webmention endpoint.
+     *
+     * @param  string  The URL
+     * @param  \GuzzleHttp\Client $client
+     * @return string  The webmention endpoint URL
+     */
+    private function discoverWebmentionEndpoint($url, $client)
+    {
+        $endpoint = null;
+
+        $response = $client->get($url);
+        //check HTTP Headers for webmention endpoint
+        $links = \GuzzleHttp\Psr7\parse_header($response->getHeader('Link'));
+        foreach ($links as $link) {
+            if ($link['rel'] == 'webmention') {
+                return trim($link[0], '<>');
+            }
+        }
+
+        //failed to find a header so parse HTML
+        $html = (string) $response->getBody();
+
+        $mf2 = new \Mf2\Parser($html, $url);
+        $rels = $mf2->parseRelsAndAlternates();
+        if (array_key_exists('webmention', $rels[0])) {
+            $endpoint = $rels[0]['webmention'][0];
+        } elseif (array_key_exists('http://webmention.org/', $rels[0])) {
+            $endpoint = $rels[0]['http://webmention.org/'][0];
+        }
+        if ($endpoint) {
+            if (filter_var($endpoint, FILTER_VALIDATE_URL)) {
+                return $endpoint;
+            }
+            //it must be a relative url, so resolve with php-mf2
+            return $mf2->resolveUrl($endpoint);
+        }
+
+        return false;
+    }
+}