X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FUtil%2FLDSignature.php;h=8cfadb16dada19da23ac65ccf997bb610bd448af;hb=e1863951986ba5be173758324a00652bc5af870c;hp=7288b584c78a7984e68ec737cabd570f2e197c94;hpb=752b5fe28464c7f1dec79132b6ef74ae71420d8b;p=friendica.git

diff --git a/src/Util/LDSignature.php b/src/Util/LDSignature.php
index 7288b584c7..8cfadb16da 100644
--- a/src/Util/LDSignature.php
+++ b/src/Util/LDSignature.php
@@ -1,91 +1,142 @@
 <?php
+/**
+ * @copyright Copyright (C) 2010-2023, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
 
 namespace Friendica\Util;
 
-use Friendica\Util\JsonLD;
-use Friendica\Util\DateTimeFormat;
-use Friendica\Protocol\ActivityPub;
+use Friendica\Core\Logger;
+use Friendica\Model\APContact;
 
+/**
+ * Implements JSON-LD signatures
+ *
+ * Ported from Osada: https://framagit.org/macgirvin/osada
+ */
 class LDSignature
 {
-	public static function isSigned($data)
+	/**
+	 * Checks if element 'signature' is found and not empty
+	 *
+	 * @param array $data
+	 * @return bool
+	 */
+	public static function isSigned(array $data): bool
 	{
 		return !empty($data['signature']);
 	}
 
-	public static function isVerified($data, $pubkey = null)
+	/**
+	 * Returns actor (signer) from given data
+	 *
+	 * @param array $data
+	 * @return mixed Returns actor or false on error
+	 */
+	public static function getSigner(array $data)
 	{
 		if (!self::isSigned($data)) {
 			return false;
 		}
 
-		if (empty($pubkey)) {
-			$actor = JsonLD::fetchElement($data, 'actor', 'id');
-			if (empty($actor)) {
-				return false;
-			}
-
-			$profile = ActivityPub::fetchprofile($actor);
-			if (empty($profile['pubkey'])) {
-				return false;
-			}
-			$pubkey = $profile['pubkey'];
+		$actor = JsonLD::fetchElement($data, 'actor', 'id');
+		if (empty($actor) || !is_string($actor)) {
+			return false;
+		}
+
+		$profile = APContact::getByURL($actor);
+		if (empty($profile['pubkey'])) {
+			return false;
 		}
+		$pubkey = $profile['pubkey'];
 
-		$ohash = self::hash(self::signable_options($data['signature']));
-		$dhash = self::hash(self::signable_data($data));
+		$ohash = self::hash(self::signableOptions($data['signature']));
+		$dhash = self::hash(self::signableData($data));
 
 		$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
-		logger('LD-verify: ' . intval($x));
+		Logger::info('LD-verify', ['verified' => (int)$x, 'actor' => $profile['url']]);
 
-		return $x;
+		if (empty($x)) {
+			return false;
+		} else {
+			return $actor;
+		}
 	}
 
-	public static function sign($data, $owner)
+	/**
+	 * Signs given data by owner's signature
+	 *
+	 * @param array $data Data to sign
+	 * @param array $owner Owner information, like URL
+	 * @return array Merged array of $data and signature
+	 */
+	public static function sign(array $data, array $owner): array
 	{
 		$options = [
 			'type' => 'RsaSignature2017',
-			'nonce' => random_string(64),
+			'nonce' => Strings::getRandomHex(64),
 			'creator' => $owner['url'] . '#main-key',
-			'created' => DateTimeFormat::utcNow()
+			'created' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 		];
 
-		$ohash = self::hash(self::signable_options($options));
-		$dhash = self::hash(self::signable_data($data));
+		$ohash = self::hash(self::signableOptions($options));
+		$dhash = self::hash(self::signableData($data));
 		$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
 
 		return array_merge($data, ['signature' => $options]);
 	}
 
-
-	private static function signable_data($data)
+	/**
+	 * Removes element 'signature' from array
+	 *
+	 * @param array $data
+	 * @return array With no element 'signature'
+	 */
+	private static function signableData(array $data): array
 	{
-		$newdata = [];
-		if (!empty($data)) {
-			foreach ($data as $k => $v) {
-				if (!in_array($k, ['signature'])) {
-					$newdata[$k] = $v;
-				}
-			}
-		}
-		return $newdata;
+		unset($data['signature']);
+		return $data;
 	}
 
-
-	private static function signable_options($options)
+	/**
+	 * Removes some elements and adds '@context' to it
+	 *
+	 * @param array $options
+	 * @return array With some removed elements and added '@context' element
+	 */
+	private static function signableOptions(array $options): array
 	{
 		$newopts = ['@context' => 'https://w3id.org/identity/v1'];
-		if (!empty($options)) {
-			foreach ($options as $k => $v) {
-				if (!in_array($k, ['type','id','signatureValue'])) {
-					$newopts[$k] = $v;
-				}
-			}
-		}
-		return $newopts;
+
+		unset($options['type']);
+		unset($options['id']);
+		unset($options['signatureValue']);
+
+		return array_merge($newopts, $options);
 	}
 
-	private static function hash($obj)
+	/**
+	 * Hashes normalized object
+	 *
+	 * @param ??? $obj
+	 * @return string SHA256 hash
+	 */
+	private static function hash($obj): string
 	{
 		return hash('sha256', JsonLD::normalize($obj));
 	}