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<?php
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define('IMPERSONATE_USER', 'impersonate user');
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define('ADMINISTER_IMPERSONATE_MODULE', 'administer impersonate module');
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define('IMPERSONATE_VAR_PREFIX','impersonate_original_');
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function get_uid_for_username($username=NULL) {
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$result = FALSE;
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if (is_string($username)) {
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$res = db_query("SELECT COUNT(u.uid) AS cnt FROM {users} u WHERE u.name='%s'",$username);
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$result = (db_result($res) > 0);
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if ($result) {
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$res = db_query("SELECT u.uid AS uid FROM {users} u WHERE u.name='%s'",$username);
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$result = db_result($res);
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}
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}
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return $result;
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}
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function get_impersonate_variable_name() {
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return IMPERSONATE_VAR_PREFIX.session_id();
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}
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function get_impersonate_variable_name_for_user($uid) {
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return IMPERSONATE_VAR_PREFIX.$uid;
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}
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/**
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*Implementation of hook_perm
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*/
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function impersonate_perm() {
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return array(IMPERSONATE_USER, ADMINISTER_IMPERSONATE_MODULE);
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}
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function user_impersonate_active() {
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$original_user = variable_get(get_impersonate_variable_name(),FALSE);
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return ($original_user !== FALSE);
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}
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/**
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* Does user have any assigned roles for impersonation
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*/
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function user_has_assigned_impersonate_roles($uid) {
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$settings = variable_get(get_impersonate_variable_name_for_user($uid),FALSE);
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$rids = '';
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if (is_array($settings)) {
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foreach ($settings as $val) {
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if ($val > 0) {
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if ($rids != '') {
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$rids .=',';
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}
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$rids .= $val;
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}
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}
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}
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if ($rids == '') {
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$rids = '0';
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}
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$query = "SELECT count(u.name) as cnt FROM {users} u, {users_roles} ur, {role} r
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WHERE ur.uid=u.uid
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AND ur.rid=r.rid
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AND r.rid IN (".$rids.")";
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return (db_result(db_query($query)) > 0);
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}
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/**
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* Retrieve a pipe delimited string of autocomplete suggestions for existing users
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* For now we can assume that $roles look like this: 'Worthologist', 'Registered Member'
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*
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*/
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function impersonate_user_autocomplete($string = '') {
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global $user;
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$matches = array();
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if ($string) {
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//Load settings for this user (if there are any)
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$settings = variable_get(get_impersonate_variable_name_for_user($user->uid),FALSE);
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$rids = '0';
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if (is_array($settings)) {
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$rids = '';
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foreach ($settings as $val) {
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if ($val > 0) {
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if ($rids != '') {
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$rids .=',';
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}
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$rids .= $val;
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}
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}
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if ($rids == '') {
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$rids = '0';
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}
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}
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$result = db_query_range("SELECT u.name as name FROM {users} u, {users_roles} ur, {role} r
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WHERE ur.uid=u.uid
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AND ur.rid=r.rid
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AND u.name LIKE '%s%%'
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AND r.rid IN (%s)", $string, $rids, 0, 10);
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while ($found_user = db_fetch_object($result)) {
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$matches[$found_user->name] = check_plain($found_user->name);
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}
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}
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print drupal_to_js($matches);
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exit();
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}
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function get_impersonate_access($access_right) {
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global $user;
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$result = user_access($access_right,$user);
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$stored_variable = get_impersonate_variable_name();
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$original_uid = variable_get($stored_variable,FALSE);
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if ($original_uid !== FALSE) {
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$account = user_load(array('uid' => $uid));
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}
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return user_access($access_right,$user) || user_access($access_right,$account);
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}
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/**
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* Implementation of hook_menu
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*
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* @param unknown_type $may_cache
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*/
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function impersonate_menu($may_cache) {
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global $user;
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$items = array();
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$imp_access = user_impersonate_active()
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|| ( get_impersonate_access(IMPERSONATE_USER)
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&& user_has_assigned_impersonate_roles($user->uid));
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$adm_access = get_impersonate_access(ADMINISTER_IMPERSONATE_MODULE);
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$any_access = $imp_access || $adm_access;
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if ($may_cache) {
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$items[] = array('path' => 'user/impersonate_autocomplete', 'title' => t('Impersonate User autocomplete'),
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'callback' => 'impersonate_user_autocomplete', 'access' => $any_access, 'type' => MENU_CALLBACK);
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} else {
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if (arg(0) == 'user' && is_numeric(arg(1))) {
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global $user;
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$account = user_load(array('uid' => arg(1)));
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if ( ($user->uid != $account->uid) || $adm_access ) {
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$items[] = array('path' => 'user/'. arg(1) .'/impersonate_admin',
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'title' => t('Impersonate Administration'),
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'callback' => 'impersonate_admin_user_page',
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'type' => MENU_LOCAL_TASK,
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'access' => $user->uid,
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'weight' => 2,
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);
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}
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}
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if ( ( $user->uid == arg(1) ) && $imp_access ) {
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$items[] = array('path' => 'user/'. arg(1) .'/impersonate',
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'title' => t('Impersonate'),
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'callback' => 'impersonate_user_page',
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'type' => MENU_LOCAL_TASK,
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'access' => $user->uid,
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'weight' => 2,
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);
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}
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}
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return $items;
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}
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/**
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* Callback function for generating form for setting
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* user impersonation
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*
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*/
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function impersonate_user_page() {
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//Generate the form
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global $user;
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if ($account = user_load(array('uid' => arg(1)))) {
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$output = null;
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if (user_impersonate_active() || user_access(IMPERSONATE_USER,$account)) {
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drupal_set_title('Setup impersonating data');
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$output = drupal_get_form('impersonate_setup_user');
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}
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return $output;
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}
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else {
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drupal_not_found();
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}
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}
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/**
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* Pure form generation
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*
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*/
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function impersonate_setup_user() {
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global $user;
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if (!user_impersonate_active()) {
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$disable = !user_has_assigned_impersonate_roles($user->uid);
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$form['user_to_impersonate'] = array(
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'#type' => 'textfield',
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'#title' => t('User to impersonate'),
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'#maxlength' => 60,
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'#description' => t("Choose a user you wish to impersonate."),
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'#autocomplete_path' => 'user/impersonate_autocomplete',
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'#required' => TRUE,
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'#disabled' => $disable
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);
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$form['submit'] = array('#type' => 'submit',
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'#value' => t('Impersonate'),
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'#disabled' => $disable
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);
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$form['#submit']['impersonate_setup_user_submit'] = array();
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$form['#validate']['impersonate_user_validate'] = array();
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} else {
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$form['submit'] = array('#type' => 'submit',
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'#value' => t('Reset Impersonation'),
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);
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$form['#submit'] = array('impersonate_user_reset' => array());
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}
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return $form;
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}
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/**
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* Enter description here...
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*
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*/
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function impersonate_admin_user_page() {
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//Generate the form
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global $user;
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if ($account = user_load(array('uid' => arg(1)))) {
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$output = null;
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if (user_access(ADMINISTER_IMPERSONATE_MODULE,$user)) {
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drupal_set_title('Setup impersonating data');
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$output = drupal_get_form('impersonate_admin_setup_page', $account);
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}
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return $output;
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}
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else {
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drupal_not_found();
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}
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}
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function impersonate_admin_setup_page($account) {
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$settings = variable_get(get_impersonate_variable_name_for_user($account->uid),FALSE);
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if ( isset($settings[0]) ) {
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unset($settings[0]);
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}
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$form['selected_roles'] = array(
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'#type' => 'checkboxes',
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'#title' => t('User Roles'),
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'#description' => t('List of all user roles in the system'),
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'#options' => user_roles(),
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'#default_value' => array()
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);
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if (is_array($settings)) {
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$form['selected_roles']['#default_value'] = $settings;
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}
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$form['submit'] = array('#type' => 'submit',
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'#value' => t('Save settings'),
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);
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$form['#submit'] = array('impersonate_user_admin_submit' => array(''));
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$form['uid'] = array('#type' => 'value', '#value' => $account->uid);
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return $form;
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}
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function impersonate_user_validate($form_id, $form_values) {
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$username = $form_values['user_to_impersonate'];
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$uid = get_uid_for_username($username);
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if ($uid === FALSE) {
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form_set_error('user_to_impersonate',t('Invalid username! Make sure username exists and you have permission to impersonate it.'));
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}
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}
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function impersonate_setup_user_submit($form_id, $form_values) {
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$username = $form_values['user_to_impersonate'];
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$uid = get_uid_for_username($username);
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impersonate_activate($uid);
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return 'user';
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}
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function impersonate_user_reset($form_id, $form_values) {
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impersonate_reset();
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return 'user';
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}
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function impersonate_user_admin_submit($form_id, $form_values) {
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$selected_roles = $form_values['selected_roles'];
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if ( isset($selected_roles[0]) ) {
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unset($selected_roles[0]);
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}
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//Check if we have empty selection
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$empty_selection = true;
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foreach ($selected_roles as $role) {
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if ($role > 0) {
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$empty_selection = false;
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break;
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}
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}
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$vname = get_impersonate_variable_name_for_user($form_values['uid']);
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if ($empty_selection) {
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variable_del($vname);
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} else {
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variable_set($vname,$selected_roles);
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}
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}
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function impersonate_activate($uid) {
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global $user;
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if ($user->uid == $uid) {
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return;
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}
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$account = user_load(array('uid' => $uid));
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if ($account === FALSE) {
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drupal_set_message('Invalid user account. Unable to impersonate', 'error');
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} else {
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$stored_variable = get_impersonate_variable_name();
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if (variable_get($stored_variable,FALSE) === FALSE) {
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variable_set($stored_variable,$user->uid);
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}
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$user = $account;
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}
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}
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function impersonate_reset() {
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global $user;
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$stored_variable = get_impersonate_variable_name();
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$original_uid = variable_get($stored_variable,FALSE);
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if ($original_uid !== FALSE) {
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$account = user_load(array('uid' => $original_uid));
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$user = $account;
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variable_del($stored_variable);
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}
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}
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|
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