port hubzillas OpenWebAuth - readd some ActivityPup code to HTTPSig

diff --git a/src/Util/HTTPSig.php b/src/Util/HTTPSig.php
index a7c9f23..18f3821 100644 (file)
--- a/src/Util/HTTPSig.php
+++ b/src/Util/HTTPSig.php
@@ -6,8 +6,10 @@
 namespace Friendica\Util;
 
 use Friendica\Core\Config;
+use Friendica\Database\DBM;
 use Friendica\Util\Crypto;
 use Friendica\Util\HTTPHeaders;
+use dba;
 
 /**
  * @brief Implements HTTP Signatures per draft-cavage-http-signatures-07.
@@ -120,6 +122,12 @@ class HTTPSig
                        $key = $key($sig_block['keyId']);
                }
 
+               // We don't use Activity Pub at the moment.
+//             if (!$key) {
+//                     $result['signer'] = $sig_block['keyId'];
+//                     $key = self::getActivitypubKey($sig_block['keyId']);
+//             }
+
                if (!$key) {
                        return $result;
                }
@@ -158,6 +166,43 @@ class HTTPSig
                return $result;
        }
 
+       /**
+        * Fetch the public key for Activity Pub contact.
+        * 
+        * @param string|int The identifier (contact addr or contact ID).
+        * @return string|boolean The public key or false on failure.
+        */
+       private static function getActivitypubKey($id)
+       {
+               if (strpos($id, 'acct:') === 0) {
+                       $x = dba::selectFirst('contact', ['pubkey'], ['uid' => 0, 'addr' => str_replace('acct:', '', $id)]);
+               } else {
+                       $x = dba::selectFirst('contact', ['pubkey'], ['id' => $id, 'network' => 'activitypub']);
+               }
+
+               if (DBM::is_result($x)) {
+                       return $x['pubkey'];
+               }
+
+               if(function_exists('as_fetch')) {
+                       $r = as_fetch($id);
+               }
+
+               if ($r) {
+                       $j = json_decode($r, true);
+
+                       if (array_key_exists('publicKey', $j) && array_key_exists('publicKeyPem', $j['publicKey'])) {
+                               if ((array_key_exists('id', $j['publicKey']) && $j['publicKey']['id'] !== $id) && $j['id'] !== $id) {
+                                       return false;
+                               }
+
+                               return $j['publicKey']['publicKeyPem'];
+                       }
+               }
+
+               return false;
+       }
+
        /**
         * @brief
         *