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<?php
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/**
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* @file
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* Contains FeedsAccountSwitcher class.
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*/
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/**
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* An implementation of FeedsAccountSwitcherInterface.
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*
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* This allows for safe switching of user accounts by ensuring that session
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* data for one user is not leaked in to others. It also provides a stack that
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* allows reverting to a previous user after switching.
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*/
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class FeedsAccountSwitcher implements FeedsAccountSwitcherInterface {
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/**
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* A stack of previous overridden accounts.
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*
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* @var object[]
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*/
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protected $accountStack = array();
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/**
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* The current user service.
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*
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* @var object
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*/
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protected $currentUser = array();
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/**
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* The original state of session prior to account switching.
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*
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* @var bool
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*/
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protected $originalSessionSave;
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/**
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* Constructs a new FeedsAccountSwitcher.
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*
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* @param object $current_user
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* (optional) The current user.
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*/
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public function __construct($current_user = NULL) {
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if (is_null($current_user)) {
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global $user;
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$this->currentUser = $user;
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}
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else {
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$this->currentUser = $current_user;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function switchTo($account) {
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// Prevent session information from being saved and push previous account.
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if (!isset($this->originalSessionSave)) {
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// Ensure that only the first session saving status is saved.
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$this->originalSessionSave = drupal_save_session();
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drupal_save_session(FALSE);
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}
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array_push($this->accountStack, $this->currentUser);
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$this->currentUser = $account;
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$this->activateCurrentUser();
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return $this;
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}
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/**
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* {@inheritdoc}
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*/
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public function switchBack() {
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// Restore the previous account from the stack.
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if (!empty($this->accountStack)) {
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$this->currentUser = array_pop($this->accountStack);
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$this->activateCurrentUser();
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}
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else {
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throw new FeedsAccountSwitcherException('No more accounts to revert to.');
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}
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// Restore original session saving status if all account switches are
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// reverted.
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if (empty($this->accountStack)) {
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if ($this->originalSessionSave) {
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drupal_save_session($this->originalSessionSave);
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}
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}
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return $this;
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}
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/**
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* Assigns current user from this class to the global $user object.
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*/
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protected function activateCurrentUser() {
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global $user;
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$user = $this->currentUser;
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}
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}
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