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<?php
/**
* @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
*
* @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 <http://www.gnu.org/licenses/>.
*
*/
namespace LookupServer\Validator;
use Abraham\TwitterOAuth\TwitterOAuth;
use LookupServer\SignatureHandler;
class Twitter {
/** @var TwitterOAuth */
private $twitterOAuth;
/** @var SignatureHandler */
private $signatureHandler;
/** @var \PDO */
private $db;
/**
* Twitter constructor.
*
* @param TwitterOAuth $twitterOAuth
* @param SignatureHandler $signatureHandler
* @param \PDO $db
*/
public function __construct(TwitterOAuth $twitterOAuth, SignatureHandler $signatureHandler, \PDO $db) {
$this->twitterOAuth = $twitterOAuth;
$this->signatureHandler = $signatureHandler;
$this->db = $db;
}
/**
* verify Twitter proof
*
* @param array $verificationData from toVerify table
* @param array $userData stored user data
* @return bool
*/
public function verify(array $verificationData, array $userData) {
$twitterHandle = $verificationData['location'];
$isValid = $this->isValidTwitterHandle($twitterHandle);
$result = false;
if ($isValid === false) {
return $result;
}
try {
$userName = substr($twitterHandle, 1);
list($tweetId, $text) = $this->getTweet($userName);
if ($text !== null) {
$cloudId = $userData['federationId'];
list($message, $md5signature) = $this->splitMessageSignature($text);
$signature = $userData['twitter_signature']['value'];
$result = $this->signatureHandler->verify($cloudId, $message, $signature);
$result = $result && md5($signature) === $md5signature;
}
} catch (\Exception $e) {
// do nothing, just return false;
}
if ($result === true) {
$this->storeReference((int)$verificationData['userId'], $tweetId);
}
return $result;
}
/**
* get tweet text and id
*
* @param string $userName user name without the '@'
* @return array
*/
private function getTweet($userName) {
try {
$search = 'from:' . $userName . ' Use my Federated Cloud ID to share with me';
$statuses = $this->twitterOAuth->get('search/tweets', ['q' => $search]);
$id = $statuses->statuses[0]->id;
$text = $statuses->statuses[0]->text;
} catch (\Exception $e) {
return [null, null];
}
return [$id, $text];
}
/**
* check if we have a correct twitter Handle
*
* @param $twitterHandle
* @return bool
*/
private function isValidTwitterHandle($twitterHandle) {
$result = preg_match('/^@[A-Za-z0-9_]+$/', $twitterHandle);
return $result === 1;
}
/**
* split message and signature
*
* @param string $proof
* @return array
*/
private function splitMessageSignature($proof) {
$signature = substr($proof, -32);
$message = substr($proof, 0, -32);
return [trim($message), trim($signature)];
}
/**
* store reference to tweet
*
* @param $userId
* @param $tweetId
*/
private function storeReference($userId, $tweetId) {
$key = 'tweet_id';
// delete old value, if exists
$stmt = $this->db->prepare('DELETE FROM store WHERE userId = :userId AND k = :k');
$stmt->bindParam(':userId', $userId, \PDO::PARAM_INT);
$stmt->bindParam(':k', $key, \PDO::PARAM_STR);
$stmt->execute();
$stmt->closeCursor();
// add new value
$stmt = $this->db->prepare('INSERT INTO store (userId, k, v) VALUES (:userId, :k, :v)');
$stmt->bindParam(':userId', $userId, \PDO::PARAM_INT);
$stmt->bindParam(':k', $key, \PDO::PARAM_STR);
$stmt->bindParam(':v', $tweetId, \PDO::PARAM_STR);
$stmt->execute();
$stmt->closeCursor();
}
}
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