Centralize HTTP limits

og.php

@@ -1,9 +1,27 @@
 <?php
 declare(strict_types=1);
+require_once __DIR__ . '/http-limits.php';
 
 function scanOG(string $url): array {
   $og = array();
-  $html = file_get_contents($url);
+  $limits = httpLimits();
+  $ctx = stream_context_create([
+    'http' => [
+      'timeout' => $limits['timeout'],
+      'follow_location' => 1,
+      'max_redirects' => $limits['max_redirects'],
+      'user_agent' => $limits['user_agent'],
+      'ignore_errors' => true
+    ],
+    'ssl' => [
+      'verify_peer' => true,
+      'verify_peer_name' => true
+    ]
+  ]);
+  $html = @file_get_contents($url, false, $ctx);
+  if ($html === false || strlen($html) > $limits['max_bytes']) {
+    return $og;
+  }
 
   $re = '/<meta (name|property)=("|\')(.*?)("|\').*?content=("|\')(.*?)("|\')/m';
   preg_match_all($re, $html, $matches, PREG_SET_ORDER, 0);