<?php

/**
 * @file
 * Add link to publish or unpublish a node, with access control based on the
 * node type
 */

/**
 * Implements hook_menu().
 */
function publishcontent_menu() {
  $items = array();
  $items['admin/config/content/publishcontent'] = array(
    'title' => 'Publish content settings',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('publishcontent_config_form'),
    'access callback' => 'user_access',
    'access arguments' => array('administer site configuration'),
    'description' => 'Configure settings.',
    'file' => 'publishcontent.admin.inc',
    'type' => MENU_NORMAL_ITEM,
  );
  $items['node/%publishcontent_tab/publish/%publishcontent_security_token'] = array(
    'title' => 'Publish',
    'page callback' => 'publishcontent_toggle_status',
    'page arguments' => array(1),
    'access callback' => '_publishcontent_publish_access',
    'access arguments' => array(1, 3),
    'weight' => 5,
    'type' => MENU_LOCAL_TASK,
    'options' => array('attributes' => array('class' => array('publishcontent-link', 'publishcontent-publish'))),
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
  );
  $items['node/%publishcontent_tab/unpublish/%publishcontent_security_token'] = array(
    'title' => 'Unpublish',
    'page callback' => 'publishcontent_toggle_status',
    'page arguments' => array(1),
    'access callback' => '_publishcontent_unpublish_access',
    'access arguments' => array(1, 3),
    'weight' => 5,
    'type' => MENU_LOCAL_TASK,
    'options' => array('attributes' => array('class' => array('publishcontent-link', 'publishcontent-unpublish'))),
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
  );
  return $items;
}

/**
 * Decide to show the (un)publish tab or not.
 */
function publishcontent_tab_load($nid) {
  if (is_numeric($nid)) {
    $node = node_load($nid);
    if (variable_get('publishcontent_tabs', TRUE)) {
      return $node;
    }
  }
  return FALSE;
}

/**
 * Used to append a security token to prevent XSS.
 *
 * @see Dynamic argument replacement (wildcard) for hook_menu at
 *      http://drupal.org/node/109153
 */
function publishcontent_security_token_to_arg($arg, $map, $index) {
  return drupal_get_token();
}

/**
 * Access callback for publish action. Only allow access based on permissions 
 * and current node status = unpublished
 */
function _publishcontent_publish_access($node, $token = FALSE) {
  if (!is_object($node)) {
    return FALSE;
  }
  if ($token && !drupal_valid_token($token)) {
    return FALSE;
  }
  if (!variable_get('publishcontent_' . $node->type, TRUE)) {
    return FALSE;
  }

  global $user;
  return !$node->status && 
    (user_access('administer nodes')
    || user_access('publish any content')
    || (user_access('publish own content') && $user->uid == $node->uid) 
    || (user_access('publish editable content') && node_access('update', $node))
    || (user_access('publish own '. check_plain($node->type) .' content', $user) && $user->uid == $node->uid) 
    || user_access('publish any '. check_plain($node->type) .' content') 
    || (user_access('publish editable '. check_plain($node->type) .' content') && node_access('update', $node))
  );
}

/**
 * Access callback for unpublish action. Only allow access based on permissions
 * and current node status = published
 */
function _publishcontent_unpublish_access($node, $token = FALSE) {
  if (!is_object($node)) {
    return FALSE;
  }
  if ($token && !drupal_valid_token($token)) {
    return FALSE;
  }
  if (!variable_get('publishcontent_' . $node->type, TRUE)) {
    return FALSE;
  }

  global $user;
  return $node->status && 
    (user_access('administer nodes')
    || user_access('unpublish any content')
    || (user_access('unpublish own content') && $user->uid == $node->uid) 
    || (user_access('unpublish editable content') && node_access('update', $node)) 
    || (user_access('unpublish own '. check_plain($node->type) .' content', $user) && $user->uid == $node->uid) 
    || user_access('unpublish any '. check_plain($node->type) .' content') 
    || (user_access('unpublish editable '. check_plain($node->type) .' content') && node_access('update', $node))
  );
}

/**
 * Implementation of hook_permission().
 */
function publishcontent_permission() {
  $perms = array(
    'publish any content' => array(
      'title' => t('Publish any content'),
    ),
    'unpublish any content' => array(
      'title' => t('Unpublish any content'),
    ),
    'publish editable content' => array(
      'title' => t('Publish editable content'),
    ),
    'unpublish editable content' => array(
      'title' => t('Unpublish editable content'),
    ),
  );

  foreach (node_type_get_types() as $type) {
    if (!variable_get('publishcontent_' . $type->type, TRUE)) {
      continue;
    }
    if (isset($type->type)) {
      $perms['publish any ' . $type->type . ' content'] = array(
        'title' => t('Publish any @type content', array('@type' => $type->name)));
      $perms['publish own ' . $type->type . ' content'] = array(
        'title' => t('Publish own @type content', array('@type' => $type->name)));
      $perms['publish editable ' . $type->type . ' content'] = array(
        'title' => t('Publish editable @type content', array('@type' => $type->name)));
      $perms['unpublish any ' . $type->type . ' content'] = array(
        'title' => t('Unpublish any @type content', array('@type' => $type->name)));
      $perms['unpublish own ' . $type->type . ' content'] = array(
        'title' => t('Unpublish own @type content', array('@type' => $type->name)));
      $perms['unpublish editable ' . $type->type . ' content'] = array(
        'title' => t('Unpublish editable @type content', array('@type' => $type->name)));
    }
  }
  return $perms;
}

/**
 * Helper function to generate change of status message.
 */
function _publishcontent_get_message($nid, $title, $status) {
  return t($status ? '"@title" [@nid] has been published'
                         : '"@title" [@nid] has been unpublished',
           array('@title' => $title, '@nid' => $nid));
}

/**
 * Menu callback for publish / unpublish content actions.
 * @param $node a node object
 */
function publishcontent_toggle_status($node) {
  // XOR the current status with 1 to get the opposite value.
  $node->status = $node->status ^ 1;
  // If this content type specifies that a new revision should be created on
  // editing, then make sure to respect this option.
  $node_options = variable_get('node_options_' . $node->type, array());
  if (in_array('revision', $node_options)) {
    $node->revision = 1;
  }
  node_save($node);
  drupal_set_message(_publishcontent_get_message($node->nid, $node->title, $node->status));
  drupal_goto($_SERVER['HTTP_REFERER']);
}

/**
 * Implementation of hook_form_alter()
 *
 * allow to use the 'Publishing options' on the edit/add page
 */
function publishcontent_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'node_type_form') {
    $form['workflow']['publishcontent'] = array(
      '#type' => 'checkbox',
      '#title' => t('Enable publishcontent'),
      '#default_value' => variable_get('publishcontent_' . $form['#node_type']->type, TRUE),
      '#description' => t('Display publish or unpublish link for nodes of this type.'),
    );
  }
  elseif (user_access('administer nodes')
  || empty($form['#node']) || empty($form['#node']->type)
  || $form['#node']->type . '_node_form' != $form_id
  || (!_publishcontent_unpublish_access($form['#node'])
      && !_publishcontent_publish_access($form['#node']))) {
     return;
  }
  $form['options']['status']['#access'] = TRUE;
  if (!empty($form['options']['#access'])) {
    return;
  }
  else {
    $form['options']['#access'] = TRUE;
  }
  foreach (element_children($form['options']) as $key) {
    // If another form has afforded access to a particular option, do not
    // override that access. Otherwise, disable it.
    $form['options'][$key]['#access'] =
     isset($form['options'][$key]['#access'])
     ? $form['options'][$key]['#access'] : FALSE;
  }
}

/**
 * Implements hook_views_api()
 */
function publishcontent_views_api() {
  return array('api' => 3);
}

/**
 * Implements hook_views_data_alter() to add items to the node table that are
 * relevant to publishcontent.
 */
function publishcontent_views_data_alter(&$data) {
  // new comments
  $data['node']['publishcontent'] = array(
    'title' => t('Publish link'),
    'help' => t('Display a link to publish the node.'),
    'field' => array(
      'handler' => 'publishcontent_views_handler_field_node_link',
    ),
  );
}