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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Database-level access to user management tables (if not using single sign-on)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
/**
* Return the expected value for the passcheck column given the $password and password $salt
* @param $password
* @param $salt
* @return mixed|string
*/
function qa_db_calc_passcheck($password, $salt)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return sha1(substr($salt, 0, 8) . $password . substr($salt, 8));
}
/**
* Create a new user in the database with $email, $password, $handle, privilege $level, and $ip address
* @param $email
* @param $password
* @param $handle
* @param $level
* @param $ip
* @return mixed
*/
function qa_db_user_create($email, $password, $handle, $level, $ip)
{
require_once QA_INCLUDE_DIR . 'util/string.php';
$ipHex = bin2hex(@inet_pton($ip));
if (QA_PASSWORD_HASH) {
qa_db_query_sub(
'INSERT INTO ^users (created, createip, email, passhash, level, handle, loggedin, loginip) ' .
'VALUES (NOW(), UNHEX($), $, $, #, $, NOW(), UNHEX($))',
$ipHex, $email, isset($password) ? password_hash($password, PASSWORD_BCRYPT) : null, (int)$level, $handle, $ipHex
);
} else {
$salt = isset($password) ? qa_random_alphanum(16) : null;
qa_db_query_sub(
'INSERT INTO ^users (created, createip, email, passsalt, passcheck, level, handle, loggedin, loginip) ' .
'VALUES (NOW(), UNHEX($), $, $, UNHEX($), #, $, NOW(), UNHEX($))',
$ipHex, $email, $salt, isset($password) ? qa_db_calc_passcheck($password, $salt) : null, (int)$level, $handle, $ipHex
);
}
return qa_db_last_insert_id();
}
/**
* Delete user $userid from the database, along with everything they have ever done (to the extent that it's possible)
* @param $userid
*/
function qa_db_user_delete($userid)
{
qa_db_query_sub('UPDATE ^posts SET lastuserid=NULL WHERE lastuserid=$', $userid);
qa_db_query_sub('DELETE FROM ^userpoints WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^blobs WHERE blobid=(SELECT avatarblobid FROM ^users WHERE userid=$)', $userid);
qa_db_query_sub('DELETE FROM ^users WHERE userid=$', $userid);
// All the queries below should be superfluous due to foreign key constraints, but just in case the user switched to MyISAM.
// Note also that private messages to/from that user are kept since we don't have all the keys we need to delete efficiently.
qa_db_query_sub('UPDATE ^posts SET userid=NULL WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^userlogins WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^userprofile WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^userfavorites WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^userevents WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^uservotes WHERE userid=$', $userid);
qa_db_query_sub('DELETE FROM ^userlimits WHERE userid=$', $userid);
}
/**
* Return the ids of all users in the database which match $email (should be one or none)
* @param $email
* @return array
*/
function qa_db_user_find_by_email($email)
{
return qa_db_read_all_values(qa_db_query_sub(
'SELECT userid FROM ^users WHERE email=$',
$email
));
}
/**
* Return the ids of all users in the database which match $handle (=username), should be one or none
* @param $handle
* @return array
*/
function qa_db_user_find_by_handle($handle)
{
return qa_db_read_all_values(qa_db_query_sub(
'SELECT userid FROM ^users WHERE handle=$',
$handle
));
}
/**
* Return an array mapping each userid in $userids that can be found to that user's handle
* @param $userids
* @return array
*/
function qa_db_user_get_userid_handles($userids)
{
if (count($userids)) {
return qa_db_read_all_assoc(qa_db_query_sub(
'SELECT userid, handle FROM ^users WHERE userid IN (#)',
$userids
), 'userid', 'handle');
}
return array();
}
/**
* Return an array mapping mapping each handle in $handle that can be found to that user's userid
* @param $handles
* @return array
*/
function qa_db_user_get_handle_userids($handles)
{
if (count($handles)) {
return qa_db_read_all_assoc(qa_db_query_sub(
'SELECT handle, userid FROM ^users WHERE handle IN ($)',
$handles
), 'handle', 'userid');
}
return array();
}
/**
* Set $field of $userid to $value in the database users table. If the $fields parameter is an array, the $value
* parameter is ignored and each element of the array is treated as a key-value pair of user fields and values.
* @param mixed $userid
* @param string|array $fields
* @param string|null $value
*/
function qa_db_user_set($userid, $fields, $value = null)
{
if (!is_array($fields)) {
$fields = array(
$fields => $value,
);
}
$sql = 'UPDATE ^users SET ';
foreach ($fields as $field => $fieldValue) {
$sql .= qa_db_escape_string($field) . ' = $, ';
}
$sql = substr($sql, 0, -2) . ' WHERE userid = $';
$params = array_values($fields);
$params[] = $userid;
qa_db_query_sub_params($sql, $params);
}
/**
* Set the password of $userid to $password, and reset their salt at the same time
* @param $userid
* @param $password
* @return mixed
*/
function qa_db_user_set_password($userid, $password)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'util/string.php';
if (QA_PASSWORD_HASH) {
qa_db_query_sub(
'UPDATE ^users SET passhash=$, passsalt=NULL, passcheck=NULL WHERE userid=$',
password_hash($password, PASSWORD_BCRYPT), $userid
);
} else {
$salt = qa_random_alphanum(16);
qa_db_query_sub(
'UPDATE ^users SET passsalt=$, passcheck=UNHEX($) WHERE userid=$',
$salt, qa_db_calc_passcheck($password, $salt), $userid
);
}
}
/**
* Switch on the $flag bit of the flags column for $userid if $set is true, or switch off otherwise
* @param $userid
* @param $flag
* @param $set
*/
function qa_db_user_set_flag($userid, $flag, $set)
{
qa_db_query_sub(
'UPDATE ^users SET flags=flags' . ($set ? '|' : '&~') . '# WHERE userid=$',
$flag, $userid
);
}
/**
* Return a random string to be used for a user's emailcode column
*/
function qa_db_user_rand_emailcode()
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'util/string.php';
return qa_random_alphanum(8);
}
/**
* Return a random string to be used for a user's sessioncode column (for browser session cookies)
*/
function qa_db_user_rand_sessioncode()
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'util/string.php';
return qa_random_alphanum(8);
}
/**
* Set a row in the database user profile table to store $value for $field for $userid
* @param $userid
* @param $field
* @param $value
*/
function qa_db_user_profile_set($userid, $field, $value)
{
qa_db_query_sub(
'INSERT INTO ^userprofile (userid, title, content) VALUES ($, $, $) ' .
'ON DUPLICATE KEY UPDATE content = VALUES(content)',
$userid, $field, $value
);
}
/**
* Note in the database that $userid just logged in from $ip address
* @param $userid
* @param $ip
*/
function qa_db_user_logged_in($userid, $ip)
{
qa_db_query_sub(
'UPDATE ^users SET loggedin=NOW(), loginip=UNHEX($) WHERE userid=$',
bin2hex(@inet_pton($ip)), $userid
);
}
/**
* Note in the database that $userid just performed a write operation from $ip address
* @param $userid
* @param $ip
*/
function qa_db_user_written($userid, $ip)
{
qa_db_query_sub(
'UPDATE ^users SET written=NOW(), writeip=UNHEX($) WHERE userid=$',
bin2hex(@inet_pton($ip)), $userid
);
}
/**
* Add an external login in the database for $source and $identifier for user $userid
* @param $userid
* @param $source
* @param $identifier
*/
function qa_db_user_login_add($userid, $source, $identifier)
{
qa_db_query_sub(
'INSERT INTO ^userlogins (userid, source, identifier, identifiermd5) ' .
'VALUES ($, $, $, UNHEX($))',
$userid, $source, $identifier, md5($identifier)
);
}
/**
* Return some information about the user with external login $source and $identifier in the database, if a match is found
* @param $source
* @param $identifier
* @return array
*/
function qa_db_user_login_find($source, $identifier)
{
return qa_db_read_all_assoc(qa_db_query_sub(
'SELECT ^userlogins.userid, handle, email FROM ^userlogins LEFT JOIN ^users ON ^userlogins.userid=^users.userid ' .
'WHERE source=$ AND identifiermd5=UNHEX($) AND identifier=$',
$source, md5($identifier), $identifier
));
}
/**
* Lock all tables if $sync is true, otherwise unlock them. Used to synchronize creation of external login mappings.
* @param $sync
*/
function qa_db_user_login_sync($sync)
{
if ($sync) { // need to lock all tables since any could be used by a plugin's event module
$tables = qa_db_list_tables();
$locks = array();
foreach ($tables as $table)
$locks[] = $table . ' WRITE';
qa_db_query_sub('LOCK TABLES ' . implode(', ', $locks));
} else {
qa_db_query_sub('UNLOCK TABLES');
}
}
/**
* Reset the full set of context-specific (currently, per category) user levels for user $userid to $userlevels, where
* $userlevels is an array of arrays, the inner arrays containing items 'entitytype', 'entityid' and 'level'.
* @param $userid
* @param $userlevels
*/
function qa_db_user_levels_set($userid, $userlevels)
{
qa_db_query_sub(
'DELETE FROM ^userlevels WHERE userid=$',
$userid
);
foreach ($userlevels as $userlevel) {
qa_db_query_sub(
'INSERT INTO ^userlevels (userid, entitytype, entityid, level) VALUES ($, $, #, #) ' .
'ON DUPLICATE KEY UPDATE level = VALUES(level)',
$userid, $userlevel['entitytype'], $userlevel['entityid'], $userlevel['level']
);
}
}
/**
* Get the information required for sending a mailing to the next $count users with userids greater than $lastuserid
* @param $lastuserid
* @param $count
* @return array
*/
function qa_db_users_get_mailing_next($lastuserid, $count)
{
return qa_db_read_all_assoc(qa_db_query_sub(
'SELECT userid, email, handle, emailcode, flags, level FROM ^users WHERE userid># ORDER BY userid LIMIT #',
$lastuserid, $count
));
}
/**
* Update the cached count of the number of users who are awaiting approval after registration
*/
function qa_db_uapprovecount_update()
{
if (qa_should_update_counts() && !QA_FINAL_EXTERNAL_USERS) {
qa_db_query_sub(
"INSERT INTO ^options (title, content) " .
"SELECT 'cache_uapprovecount', COUNT(*) FROM ^users " .
"WHERE level < # AND NOT (flags & #) " .
"ON DUPLICATE KEY UPDATE content = VALUES(content)",
QA_USER_LEVEL_APPROVED, QA_USER_FLAGS_USER_BLOCKED
);
}
}