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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\auth\provider\oauth;
use OAuth\OAuth1\Token\StdOAuth1Token;
use OAuth\Common\Token\TokenInterface;
use OAuth\Common\Storage\TokenStorageInterface;
use OAuth\Common\Storage\Exception\TokenNotFoundException;
use OAuth\Common\Storage\Exception\AuthorizationStateNotFoundException;
/**
* OAuth storage wrapper for phpbb's cache
*/
class token_storage implements TokenStorageInterface
{
    /**
    * Cache driver.
    *
    * @var \phpbb\db\driver\driver_interface
    */
    protected $db;
    /**
    * phpBB user
    *
    * @var \phpbb\user
    */
    protected $user;
    /**
    * OAuth token table
    *
    * @var string
    */
    protected $oauth_token_table;
    /**
    * OAuth state table
    *
    * @var string
    */
    protected $oauth_state_table;
    /**
    * @var object|TokenInterface
    */
    protected $cachedToken;
    /**
    * @var string
    */
    protected $cachedState;
    /**
    * Creates token storage for phpBB.
    *
    * @param    \phpbb\db\driver\driver_interface    $db
    * @param    \phpbb\user        $user
    * @param    string            $oauth_token_table
    * @param    string            $oauth_state_table
    */
    public function __construct(\phpbb\db\driver\driver_interface $db, \phpbb\user $user, $oauth_token_table, $oauth_state_table)
    {
        $this->db = $db;
        $this->user = $user;
        $this->oauth_token_table = $oauth_token_table;
        $this->oauth_state_table = $oauth_state_table;
    }
    /**
    * {@inheritdoc}
    */
    public function retrieveAccessToken($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedToken instanceof TokenInterface)
        {
            return $this->cachedToken;
        }
        $data = array(
            'user_id'    => (int) $this->user->data['user_id'],
            'provider'    => $service,
        );
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $data['session_id']    = $this->user->data['session_id'];
        }
        return $this->_retrieve_access_token($data);
    }
    /**
    * {@inheritdoc}
    */
    public function storeAccessToken($service, TokenInterface $token)
    {
        $service = $this->get_service_name_for_db($service);
        $this->cachedToken = $token;
        $data = array(
            'oauth_token'    => $this->json_encode_token($token),
        );
        $sql = 'UPDATE ' . $this->oauth_token_table . '
                SET ' . $this->db->sql_build_array('UPDATE', $data) . '
                WHERE user_id = ' . (int) $this->user->data['user_id'] . '
                    ' . ((int) $this->user->data['user_id'] === ANONYMOUS ? "AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'" : '') . "
                    AND provider = '" . $this->db->sql_escape($service) . "'";
        $this->db->sql_query($sql);
        if (!$this->db->sql_affectedrows())
        {
            $data = array(
                'user_id'        => (int) $this->user->data['user_id'],
                'provider'        => $service,
                'oauth_token'    => $this->json_encode_token($token),
                'session_id'    => $this->user->data['session_id'],
            );
            $sql = 'INSERT INTO ' . $this->oauth_token_table . $this->db->sql_build_array('INSERT', $data);
            $this->db->sql_query($sql);
        }
        return $this;
    }
    /**
    * {@inheritdoc}
    */
    public function hasAccessToken($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedToken)
        {
            return true;
        }
        $data = array(
            'user_id'    => (int) $this->user->data['user_id'],
            'provider'    => $service,
        );
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $data['session_id']    = $this->user->data['session_id'];
        }
        return $this->_has_acess_token($data);
    }
    /**
    * {@inheritdoc}
    */
    public function clearToken($service)
    {
        $service = $this->get_service_name_for_db($service);
        $this->cachedToken = null;
        $sql = 'DELETE FROM ' . $this->oauth_token_table . '
            WHERE user_id = ' . (int) $this->user->data['user_id'] . "
                AND provider = '" . $this->db->sql_escape($service) . "'";
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $sql .= " AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'";
        }
        $this->db->sql_query($sql);
        return $this;
    }
    /**
    * {@inheritdoc}
    */
    public function clearAllTokens()
    {
        $this->cachedToken = null;
        $sql = 'DELETE FROM ' . $this->oauth_token_table . '
            WHERE user_id = ' . (int) $this->user->data['user_id'];
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $sql .= " AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'";
        }
        $this->db->sql_query($sql);
        return $this;
    }
    /**
    * {@inheritdoc}
    */
    public function storeAuthorizationState($service, $state)
    {
        $service = $this->get_service_name_for_db($service);
        $this->cachedState = $state;
        $data = array(
            'user_id'        => (int) $this->user->data['user_id'],
            'provider'        => $service,
            'oauth_state'    => $state,
            'session_id'    => $this->user->data['session_id'],
        );
        $sql = 'INSERT INTO ' . $this->oauth_state_table . '
            ' . $this->db->sql_build_array('INSERT', $data);
        $this->db->sql_query($sql);
        return $this;
    }
    /**
    * {@inheritdoc}
    */
    public function hasAuthorizationState($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedState)
        {
            return true;
        }
        $data = array(
            'user_id'    => (int) $this->user->data['user_id'],
            'provider'    => $service,
        );
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $data['session_id']    = $this->user->data['session_id'];
        }
        return (bool) $this->get_state_row($data);
    }
    /**
    * {@inheritdoc}
    */
    public function retrieveAuthorizationState($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedState)
        {
            return $this->cachedState;
        }
        $data = array(
            'user_id'    => (int) $this->user->data['user_id'],
            'provider'    => $service,
        );
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $data['session_id']    = $this->user->data['session_id'];
        }
        return $this->get_state_row($data);
    }
    /**
    * {@inheritdoc}
    */
    public function clearAuthorizationState($service)
    {
        $service = $this->get_service_name_for_db($service);
        $this->cachedState = null;
        $sql = 'DELETE FROM ' . $this->oauth_state_table . '
            WHERE user_id = ' . (int) $this->user->data['user_id'] . "
                AND provider = '" . $this->db->sql_escape($service) . "'";
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $sql .= " AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'";
        }
        $this->db->sql_query($sql);
        return $this;
    }
    /**
    * {@inheritdoc}
    */
    public function clearAllAuthorizationStates()
    {
        $this->cachedState = null;
        $sql = 'DELETE FROM ' . $this->oauth_state_table . '
            WHERE user_id = ' . (int) $this->user->data['user_id'];
        if ((int) $this->user->data['user_id'] === ANONYMOUS)
        {
            $sql .= " AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'";
        }
        $this->db->sql_query($sql);
        return $this;
    }
    /**
    * Updates the user_id field in the database assosciated with the token
    *
    * @param    int    $user_id
    */
    public function set_user_id($user_id)
    {
        if (!$this->cachedToken)
        {
            return;
        }
        $sql = 'UPDATE ' . $this->oauth_token_table . '
            SET ' . $this->db->sql_build_array('UPDATE', array(
                    'user_id' => (int) $user_id
                )) . '
                WHERE user_id = ' . (int) $this->user->data['user_id'] . "
                    AND session_id = '" . $this->db->sql_escape($this->user->data['session_id']) . "'";
        $this->db->sql_query($sql);
    }
    /**
    * Checks to see if an access token exists solely by the session_id of the user
    *
    * @param    string    $service    The name of the OAuth service
    * @return    bool    true if they have token, false if they don't
    */
    public function has_access_token_by_session($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedToken)
        {
            return true;
        }
        $data = array(
            'session_id'    => $this->user->data['session_id'],
            'provider'        => $service,
        );
        return $this->_has_acess_token($data);
    }
    /**
    * Checks to see if a state exists solely by the session_id of the user
    *
    * @param    string    $service    The name of the OAuth service
    * @return    bool    true if they have state, false if they don't
    */
    public function has_state_by_session($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedState)
        {
            return true;
        }
        $data = array(
            'session_id'    => $this->user->data['session_id'],
            'provider'        => $service,
        );
        return (bool) $this->get_state_row($data);
    }
    /**
    * A helper function that performs the query for has access token functions
    *
    * @param    array    $data
    * @return    bool
    */
    protected function _has_acess_token($data)
    {
        return (bool) $this->get_access_token_row($data);
    }
    public function retrieve_access_token_by_session($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedToken instanceof TokenInterface)
        {
            return $this->cachedToken;
        }
        $data = array(
            'session_id'    => $this->user->data['session_id'],
            'provider'    => $service,
        );
        return $this->_retrieve_access_token($data);
    }
    public function retrieve_state_by_session($service)
    {
        $service = $this->get_service_name_for_db($service);
        if ($this->cachedState)
        {
            return $this->cachedState;
        }
        $data = array(
            'session_id'    => $this->user->data['session_id'],
            'provider'    => $service,
        );
        return $this->_retrieve_state($data);
    }
    /**
    * A helper function that performs the query for retrieve access token functions
    * Also checks if the token is a valid token
    *
    * @param    array    $data
    * @return    mixed
    * @throws \OAuth\Common\Storage\Exception\TokenNotFoundException
    */
    protected function _retrieve_access_token($data)
    {
        $row = $this->get_access_token_row($data);
        if (!$row)
        {
            throw new TokenNotFoundException('AUTH_PROVIDER_OAUTH_TOKEN_ERROR_NOT_STORED');
        }
        $token = $this->json_decode_token($row['oauth_token']);
        // Ensure that the token was serialized/unserialized correctly
        if (!($token instanceof TokenInterface))
        {
            $this->clearToken($data['provider']);
            throw new TokenNotFoundException('AUTH_PROVIDER_OAUTH_TOKEN_ERROR_INCORRECTLY_STORED');
        }
        $this->cachedToken = $token;
        return $token;
    }
    /**
     * A helper function that performs the query for retrieve state functions
     *
     * @param    array    $data
     * @return    mixed
     * @throws \OAuth\Common\Storage\Exception\AuthorizationStateNotFoundException
     */
    protected function _retrieve_state($data)
    {
        $row = $this->get_state_row($data);
        if (!$row)
        {
            throw new AuthorizationStateNotFoundException();
        }
        $this->cachedState = $row['oauth_state'];
        return $this->cachedState;
    }
    /**
    * A helper function that performs the query for retrieving an access token
    *
    * @param    array    $data
    * @return    mixed
    */
    protected function get_access_token_row($data)
    {
        $sql = 'SELECT oauth_token FROM ' . $this->oauth_token_table . '
            WHERE ' . $this->db->sql_build_array('SELECT', $data);
        $result = $this->db->sql_query($sql);
        $row = $this->db->sql_fetchrow($result);
        $this->db->sql_freeresult($result);
        return $row;
    }
    /**
     * A helper function that performs the query for retrieving a state
     *
     * @param    array    $data
     * @return    mixed
     */
    protected function get_state_row($data)
    {
        $sql = 'SELECT oauth_state FROM ' . $this->oauth_state_table . '
            WHERE ' . $this->db->sql_build_array('SELECT', $data);
        $result = $this->db->sql_query($sql);
        $row = $this->db->sql_fetchrow($result);
        $this->db->sql_freeresult($result);
        return $row;
    }
    public function json_encode_token(TokenInterface $token)
    {
        $members = array(
            'accessToken'    => $token->getAccessToken(),
            'endOfLife'        => $token->getEndOfLife(),
            'extraParams'    => $token->getExtraParams(),
            'refreshToken'    => $token->getRefreshToken(),
            'token_class'    => get_class($token),
        );
        // Handle additional data needed for OAuth1 tokens
        if ($token instanceof StdOAuth1Token)
        {
            $members['requestToken']        = $token->getRequestToken();
            $members['requestTokenSecret']    = $token->getRequestTokenSecret();
            $members['accessTokenSecret']    = $token->getAccessTokenSecret();
        }
        return json_encode($members);
    }
    public function json_decode_token($json)
    {
        $token_data = json_decode($json, true);
        if ($token_data === null)
        {
            throw new TokenNotFoundException('AUTH_PROVIDER_OAUTH_TOKEN_ERROR_INCORRECTLY_STORED');
        }
        $token_class    = $token_data['token_class'];
        $access_token    = $token_data['accessToken'];
        $refresh_token    = $token_data['refreshToken'];
        $endOfLife        = $token_data['endOfLife'];
        $extra_params    = $token_data['extraParams'];
        // Create the token
        $token = new $token_class($access_token, $refresh_token, TokenInterface::EOL_NEVER_EXPIRES, $extra_params);
        $token->setEndOfLife($endOfLife);
        // Handle OAuth 1.0 specific elements
        if ($token instanceof StdOAuth1Token)
        {
            $token->setRequestToken($token_data['requestToken']);
            $token->setRequestTokenSecret($token_data['requestTokenSecret']);
            $token->setAccessTokenSecret($token_data['accessTokenSecret']);
        }
        return $token;
    }
    /**
    * Returns the name of the service as it must be stored in the database.
    *
    * @param    string    $service    The name of the OAuth service
    * @return    string    The name of the OAuth service as it needs to be stored
    *                    in the database.
    */
    protected function get_service_name_for_db($service)
    {
        // Enforce the naming convention for oauth services
        if (strpos($service, 'auth.provider.oauth.service.') !== 0)
        {
            $service = 'auth.provider.oauth.service.' . strtolower($service);
        }
        return $service;
    }
}