<?php
// $Id$

/**
 * @file
 * User page callback file for the user module.
 */

/**
 * Menu callback; Retrieve a JSON object containing autocomplete suggestions for existing users.
 */
function user_autocomplete($string = '') {
  $matches = array();
  if ($string) {
    $result = db_query_range("SELECT name FROM {users} WHERE LOWER(name) LIKE LOWER(:name)", array(':name' => $string .'%'), 0, 10);
    while ($user = db_fetch_object($result)) {
      $matches[$user->name] = check_plain($user->name);
    }
  }

  drupal_json($matches);
}

/**
 * Form builder; Request a password reset.
 *
 * @ingroup forms
 * @see user_pass_validate()
 * @see user_pass_submit()
 */
function user_pass() {
  $form['name'] = array(
    '#type' => 'textfield',
    '#title' => t('Username or e-mail address'),
    '#size' => 60,
    '#maxlength' => max(USERNAME_MAX_LENGTH, EMAIL_MAX_LENGTH),
    '#required' => TRUE,
  );
  $form['submit'] = array('#type' => 'submit', '#value' => t('E-mail new password'));

  return $form;
}

function user_pass_validate($form, &$form_state) {
  $name = trim($form_state['values']['name']);
  // Try to load by email.
  $account = user_load(array('mail' => $name, 'status' => 1));
  if (!$account) {
    // No success, try to load by name.
    $account = user_load(array('name' => $name, 'status' => 1));
  }
  if (isset($account->uid)) {
    form_set_value(array('#parents' => array('account')), $account, $form_state);
  }
  else {
    form_set_error('name', t('Sorry, %name is not recognized as a user name or an e-mail address.', array('%name' => $name)));
  }
}

function user_pass_submit($form, &$form_state) {
  global $language;

  $account = $form_state['values']['account'];
  // Mail one time login URL and instructions using current language.
  _user_mail_notify('password_reset', $account, $language);
  watchdog('user', 'Password reset instructions mailed to %name at %email.', array('%name' => $account->name, '%email' => $account->mail));
  drupal_set_message(t('Further instructions have been sent to your e-mail address.'));

  $form_state['redirect'] = 'user';
  return;
}

/**
 * Menu callback; process one time login link and redirects to the user page on success.
 */
function user_pass_reset(&$form_state, $uid, $timestamp, $hashed_pass, $action = NULL) {
  global $user;

  // Check if the user is already logged in. The back button is often the culprit here.
  if ($user->uid) {
    drupal_set_message(t('You have already used this one-time login link. It is not necessary to use this link to login anymore. You are already logged in.'));
    drupal_goto();
  }
  else {
    // Time out, in seconds, until login URL expires. 24 hours = 86400 seconds.
    $timeout = 86400;
    $current = REQUEST_TIME;
    // Some redundant checks for extra security ?
    if ($timestamp < $current && $account = user_load(array('uid' => $uid, 'status' => 1)) ) {
      // No time out for first time login.
      if ($account->login && $current - $timestamp > $timeout) {
        drupal_set_message(t('You have tried to use a one-time login link that has expired. Please request a new one using the form below.'));
        drupal_goto('user/password');
      }
      elseif ($account->uid && $timestamp > $account->login && $timestamp < $current && $hashed_pass == user_pass_rehash($account->pass, $timestamp, $account->login)) {
        // First stage is a confirmation form, then login
        if ($action == 'login') {
          watchdog('user', 'User %name used one-time login link at time %timestamp.', array('%name' => $account->name, '%timestamp' => $timestamp));
          // Set the new user.
          $user = $account;
          // user_authenticate_finalize() also updates the login timestamp of the
          // user, which invalidates further use of the one-time login link.
          user_authenticate_finalize($form_state['values']);
          drupal_set_message(t('You have just used your one-time login link. It is no longer necessary to use this link to login. Please change your password.'));
          drupal_goto('user/' . $user->uid . '/edit');
        }
        else {
          $form['message'] = array('#markup' => t('<p>This is a one-time login for %user_name and will expire on %expiration_date.</p><p>Click on this button to login to the site and change your password.</p>', array('%user_name' => $account->name, '%expiration_date' => format_date($timestamp + $timeout))));
          $form['help'] = array('#markup' => '<p>' . t('This login can be used only once.') . '</p>');
          $form['submit'] = array('#type' => 'submit', '#value' => t('Log in'));
          $form['#action'] = url("user/reset/$uid/$timestamp/$hashed_pass/login");
          return $form;
        }
      }
      else {
        drupal_set_message(t('You have tried to use a one-time login link which has either been used or is no longer valid. Please request a new one using the form below.'));
        drupal_goto('user/password');
      }
    }
    else {
      // Deny access, no more clues.
      // Everything will be in the watchdog's URL for the administrator to check.
      drupal_access_denied();
    }
  }
}

/**
 * Menu callback; logs the current user out, and redirects to the home page.
 */
function user_logout() {
  global $user;

  watchdog('user', 'Session closed for %name.', array('%name' => $user->name));

  // Destroy the current session:
  session_destroy();
  module_invoke_all('user_logout', NULL, $user);

  // Load the anonymous user
  $user = drupal_anonymous_user();

  drupal_goto();
}

/**
 * Menu callback; Displays a user or user profile page.
 */
function user_view($account) {
  drupal_set_title($account->name);
  // Retrieve all profile fields and attach to $account->content.
  user_build_content($account);

  // To theme user profiles, copy modules/user/user_profile.tpl.php
  // to your theme directory, and edit it as instructed in that file's comments.
  return theme('user_profile', $account);
}

/**
 * Process variables for user-profile.tpl.php.
 *
 * The $variables array contains the following arguments:
 * - $account
 *
 * @see user-picture.tpl.php
 */
function template_preprocess_user_profile(&$variables) {
  $variables['profile'] = array();
  // Sort sections by weight
  uasort($variables['account']->content, 'element_sort');
  // Provide keyed variables so themers can print each section independently.
  foreach (element_children($variables['account']->content) as $key) {
    $variables['profile'][$key] = drupal_render($variables['account']->content[$key]);
  }
  // Collect all profiles to make it easier to print all items at once.
  $variables['user_profile'] = implode($variables['profile']);
}

/**
 * Process variables for user-profile-item.tpl.php.
 *
 * The $variables array contains the following arguments:
 * - $element
 *
 * @see user-profile-item.tpl.php
 */
function template_preprocess_user_profile_item(&$variables) {
  $variables['title'] = $variables['element']['#title'];
  $variables['value'] = $variables['element']['#markup'];
  $variables['attributes'] = '';
  if (isset($variables['element']['#attributes'])) {
    $variables['attributes'] = drupal_attributes($variables['element']['#attributes']);
  }
}

/**
 * Process variables for user-profile-category.tpl.php.
 *
 * The $variables array contains the following arguments:
 * - $element
 *
 * @see user-profile-category.tpl.php
 */
function template_preprocess_user_profile_category(&$variables) {
  $variables['title'] = check_plain($variables['element']['#title']);
  $variables['profile_items'] = $variables['element']['#children'];
  $variables['attributes'] = '';
  if (isset($variables['element']['#attributes'])) {
    $variables['attributes'] = drupal_attributes($variables['element']['#attributes']);
  }
}

/**
 * Form builder; Present the form to edit a given user or profile category.
 *
 * @ingroup forms
 * @see user_edit_validate()
 * @see user_edit_submit()
 */
function user_edit($account, $category = 'account') {
  drupal_set_title($account->name);
  return drupal_get_form('user_profile_form', $account, $category);
}

/**
 * Form builder; edit a user account or one of their profile categories.
 *
 * @ingroup forms
 * @see user_profile_form_validate()
 * @see user_profile_form_submit()
 * @see user_cancel_confirm_form_submit()
 */
function user_profile_form($form_state, $account, $category = 'account') {
  global $user;

  $edit = (empty($form_state['values'])) ? (array)$account : $form_state['values'];

  $form = _user_forms($edit, $account, $category);
  $form['_category'] = array('#type' => 'value', '#value' => $category);
  $form['_account'] = array('#type' => 'value', '#value' => $account);
  $form['submit'] = array('#type' => 'submit', '#value' => t('Save'), '#weight' => 30);
  if (($account->uid == $user->uid && user_access('cancel account')) || user_access('administer users')) {
    $form['cancel'] = array(
      '#type' => 'submit',
      '#value' => t('Cancel account'),
      '#weight' => 31,
      '#submit' => array('user_edit_cancel_submit'),
    );
  }
  $form['#attributes']['enctype'] = 'multipart/form-data';

  return $form;
}

/**
 * Validation function for the user account and profile editing form.
 */
function user_profile_form_validate($form, &$form_state) {
  user_module_invoke('validate', $form_state['values'], $form_state['values']['_account'], $form_state['values']['_category']);
  // Validate input to ensure that non-privileged users can't alter protected data.
  if ((!user_access('administer users') && array_intersect(array_keys($form_state['values']), array('uid', 'init', 'session'))) || (!user_access('administer permissions') && isset($form_state['values']['roles']))) {
    watchdog('security', 'Detected malicious attempt to alter protected user fields.', array(), WATCHDOG_WARNING);
    // set this to a value type field
    form_set_error('category', t('Detected malicious attempt to alter protected user fields.'));
  }
}

/**
 * Submit function for the user account and profile editing form.
 */
function user_profile_form_submit($form, &$form_state) {
  $account = $form_state['values']['_account'];
  $category = $form_state['values']['_category'];
  unset($form_state['values']['_account'], $form_state['values']['op'], $form_state['values']['submit'], $form_state['values']['cancel'], $form_state['values']['form_token'], $form_state['values']['form_id'], $form_state['values']['_category'], $form_state['values']['form_build_id']);
  user_module_invoke('submit', $form_state['values'], $account, $category);
  user_save($account, $form_state['values'], $category);

  // Clear the page cache because pages can contain usernames and/or profile information:
  cache_clear_all();

  drupal_set_message(t('The changes have been saved.'));
  return;
}

/**
 * Submit function for the 'Cancel account' button on the user edit form.
 */
function user_edit_cancel_submit($form, &$form_state) {
  $destination = '';
  if (isset($_REQUEST['destination'])) {
    $destination = drupal_get_destination();
    unset($_REQUEST['destination']);
  }
  // Note: We redirect from user/uid/edit to user/uid/cancel to make the tabs disappear.
  $form_state['redirect'] = array("user/" . $form_state['values']['_account']->uid . "/cancel", $destination);
}

/**
 * Form builder; confirm form for cancelling user account.
 *
 * @ingroup forms
 * @see user_edit_cancel_submit()
 */
function user_cancel_confirm_form(&$form_state, $account) {
  global $user;

  $form['_account'] = array('#type' => 'value', '#value' => $account);

  // Display account cancellation method selection, if allowed.
  $default_method = variable_get('user_cancel_method', 'user_cancel_block');
  $admin_access = user_access('administer users');
  $can_select_method = $admin_access || user_access('select account cancellation method');
  $form['user_cancel_method'] = array(
    '#type' => 'item',
    '#title' => ($account->uid == $user->uid ? t('When cancelling your account') : t('When cancelling the account')),
    '#access' => $can_select_method,
  );
  $form['user_cancel_method'] += user_cancel_methods();

  // Allow user administrators to skip the account cancellation confirmation
  // mail (by default), as long as they do not attempt to cancel their own
  // account.
  $override_access = $admin_access && ($account->uid != $user->uid);
  $form['user_cancel_confirm'] = array(
    '#type' => 'checkbox',
    '#title' => t('Require e-mail confirmation to cancel account.'),
    '#default_value' => ($override_access ? FALSE : TRUE),
    '#access' => $override_access,
    '#description' => t('When enabled, the user must confirm the account cancellation via e-mail.'),
  );
  // Also allow to send account canceled notification mail, if enabled.
  $default_notify = variable_get('user_mail_status_canceled_notify', FALSE);
  $form['user_cancel_notify'] = array(
    '#type' => 'checkbox',
    '#title' => t('Notify user when account is canceled.'),
    '#default_value' => ($override_access ? FALSE : $default_notify),
    '#access' => $override_access && $default_notify,
    '#description' => t('When enabled, the user will receive an e-mail notification after the account has been cancelled.'),
  );

  // Prepare confirmation form page title and description.
  if ($account->uid == $user->uid) {
    $question = t('Are you sure you want to cancel your account?');
  }
  else {
    $question = t('Are you sure you want to cancel the account %name?', array('%name' => $account->name));
  }
  $description = '';
  if ($can_select_method) {
    $description = t('Select the method to cancel the account above.');
    foreach (element_children($form['user_cancel_method']) as $element) {
      unset($form['user_cancel_method'][$element]['#description']);
    }
  }
  else {
    // The radio button #description is used as description for the confirmation
    // form.
    foreach (element_children($form['user_cancel_method']) as $element) {
      if ($form['user_cancel_method'][$element]['#default_value'] == $form['user_cancel_method'][$element]['#return_value']) {
        $description = $form['user_cancel_method'][$element]['#description'];
      }
      unset($form['user_cancel_method'][$element]['#description']);
    }
  }

  return confirm_form($form,
    $question,
    'user/' . $account->uid,
    $description . ' ' . t('This action cannot be undone.'),
    t('Cancel account'), t('Cancel'));
}

/**
 * Submit handler for the account cancellation confirm form.
 *
 * @see user_cancel_confirm_form()
 * @see user_multiple_cancel_confirm_submit()
 */
function user_cancel_confirm_form_submit($form, &$form_state) {
  global $user;
  $account = $form_state['values']['_account'];

  // Cancel account immediately, if the current user has administrative
  // privileges, no confirmation mail shall be sent, and the user does not
  // attempt to cancel the own account.
  if (user_access('administer users') && empty($form_state['values']['user_cancel_confirm']) && $account->uid != $user->uid) {
    user_cancel($form_state['values'], $account->uid, $form_state['values']['user_cancel_method']);

    if (!isset($_REQUEST['destination'])) {
      $form_state['redirect'] = 'admin/user/user';
    }
  }
  else {
    // Store cancelling method and whether to notify the user in $account for
    // user_cancel_confirm().
    $edit = array(
      'user_cancel_method' => $form_state['values']['user_cancel_method'],
      'user_cancel_notify' => $form_state['values']['user_cancel_notify'],
    );
    $account = user_save($account, $edit);
    _user_mail_notify('cancel_confirm', $account);
    drupal_set_message(t('A confirmation request to cancel your account has been sent to your e-mail address.'));
    watchdog('user', 'Sent account cancellation request to %name %email.', array('%name' => $account->name, '%email' => '<' . $account->mail . '>'), WATCHDOG_NOTICE);

    if (!isset($_REQUEST['destination'])) {
      $form_state['redirect'] = "user/$account->uid";
    }
  }
}

/**
 * Helper function to return available account cancellation methods.
 *
 * Please refer to the documentation of hook_user_cancel_methods_alter().
 *
 * @return
 *   An array containing all account cancellation methods as form elements.
 *
 * @see hook_user_cancel_methods_alter()
 * @see user_admin_settings()
 * @see user_cancel_confirm_form()
 * @see user_multiple_cancel_confirm()
 */
function user_cancel_methods() {
  $methods = array(
    'user_cancel_block' => array(
      'title' => t('Disable the account and keep all content.'),
      'description' => t('Your account will be blocked and you will no longer be able to log in. All of your content will remain attributed to your user name.'),
    ),
    'user_cancel_block_unpublish' => array(
      'title' => t('Disable the account and unpublish all content.'),
      'description' => t('Your account will be blocked and you will no longer be able to log in. All of your content will be hidden from everyone but administrators.'),
    ),
    'user_cancel_reassign' => array(
      'title' => t('Delete the account and make all content belong to the %anonymous-name user.', array('%anonymous-name' => variable_get('anonymous', t('Anonymous')))),
      'description' => t('Your account will be removed and all account information deleted. All of your content will be assigned to the %anonymous-name user.', array('%anonymous-name' => variable_get('anonymous', t('Anonymous')))),
    ),
    'user_cancel_delete' => array(
      'title' => t('Delete the account and all content.'),
      'description' => t('Your account will be removed and all account information deleted. All of your content will also be deleted.'),
      'access' => user_access('administer users'),
    ),
  );
  // Allow modules to customize account cancellation methods.
  drupal_alter('user_cancel_methods', $methods);

  // Turn all methods into real form elements.
  $default_method = variable_get('user_cancel_method', 'user_cancel_block');
  $form = array();
  foreach ($methods as $name => $method) {
    $form[$name] = array(
      '#type' => 'radio',
      '#title' => $method['title'],
      '#description' => (isset($method['description']) ? $method['description'] : NULL),
      '#return_value' => $name,
      '#default_value' => $default_method,
      '#parents' => array('user_cancel_method'),
      '#required' => TRUE,
    );
  }
  return $form;
}

/**
 * Menu callback; Cancel a user account via e-mail confirmation link.
 *
 * @see user_cancel_confirm_form()
 * @see user_cancel_url()
 */
function user_cancel_confirm($account, $timestamp = 0, $hashed_pass = '') {
  // Time out in seconds until cancel URL expires; 24 hours = 86400 seconds.
  $timeout = 86400;
  $current = REQUEST_TIME;

  // Basic validation of arguments.
  if (isset($account->user_cancel_method) && !empty($timestamp) && !empty($hashed_pass)) {
    // Validate expiration and hashed password/login.
    if ($timestamp <= $current && $current - $timestamp < $timeout && $account->uid && $timestamp >= $account->login && $hashed_pass == user_pass_rehash($account->pass, $timestamp, $account->login)) {
      $edit = array(
        'user_cancel_notify' => isset($account->user_cancel_notify) ? $account->user_cancel_notify : variable_get('user_mail_status_canceled_notify', FALSE),
      );
      user_cancel($edit, $account->uid, $account->user_cancel_method);
      // Since user_cancel() is not invoked via Form API, batch processing needs
      // to be invoked manually and should redirect to the front page after
      // completion.
      batch_process('');
    }
    else {
      drupal_set_message(t('You have tried to use an account cancellation link that has expired. Please request a new one using the form below.'));
      drupal_goto("user/$account->uid/cancel");
    }
  }
  drupal_access_denied();
}

function user_edit_validate($form, &$form_state) {
  user_module_invoke('validate', $form_state['values'], $form_state['values']['_account'], $form_state['values']['_category']);
  // Validate input to ensure that non-privileged users can't alter protected data.
  if ((!user_access('administer users') && array_intersect(array_keys($form_state['values']), array('uid', 'init', 'session'))) || (!user_access('administer permissions') && isset($form_state['values']['roles']))) {
    watchdog('security', 'Detected malicious attempt to alter protected user fields.', array(), WATCHDOG_WARNING);
    // set this to a value type field
    form_set_error('category', t('Detected malicious attempt to alter protected user fields.'));
  }
}

function user_edit_submit($form, &$form_state) {
  $account = $form_state['values']['_account'];
  $category = $form_state['values']['_category'];
  unset($form_state['values']['_account'], $form_state['values']['op'], $form_state['values']['submit'], $form_state['values']['cancel'], $form_state['values']['form_token'], $form_state['values']['form_id'], $form_state['values']['_category'], $form_state['values']['form_build_id']);
  user_module_invoke('submit', $form_state['values'], $account, $category);
  user_save($account, $form_state['values'], $category);

  // Clear the page cache because pages can contain usernames and/or profile information:
  cache_clear_all();

  drupal_set_message(t('The changes have been saved.'));
  return;
}

/**
 * Access callback for path /user.
 *
 * Displays user profile if user is logged in, or login form for anonymous
 * users.
 */
function user_page() {
  global $user;
  if ($user->uid) {
    menu_set_active_item('user/' . $user->uid);
    return menu_execute_active_handler();
  }
  else {
    return drupal_get_form('user_login');
  }
}