<?php
// $Id: hosting.module,v 1.106 2009-05-28 00:27:22 adrian Exp $

/**
 * Implementation of hook_theme().
 */
function hosting_theme() {
  return array(
    'hosting_summary_block' => array(
      'file' => 'hosting.module',
      'arguments' => array(
        'components' => NULL,
      ),
    ),
    'hosting_queues_configure' => array(
      'file' => 'hosting.module',
      'arguments' => array(
        'form' => NULL,
      ),
    ),
    'requirement_help' => array(
      'file' => 'hosting_help.inc',
      'arguments' => array(
        'form' => NULL,
      ),
    ),
  );
}

/**
 * @file Hosting module
 *
 * Contains just about all the interface magic of hostmaster.
 */
 

/**
 * Not split for performance reasons. Just to keep code together.
 */

include_once('hosting_help.inc');
include_once('hosting.queues.inc');
include_once('hosting.features.inc');

/**
 * Implementation of hook_menu()
 */
function hosting_menu() {
  global $user;
  $items = array();


  $items['hosting/disabled'] = array(
    'title' => 'Site disabled',
    'page callback' => 'hosting_disabled_site',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK
  );


  $items['hosting/maintenance'] = array(
    'title' => 'Site maintenance',
    'page callback' => 'hosting_site_maintenance',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK
  );

  
  $items['admin/help/provision/requirements'] = array(
    'title' => 'Provisioning requirements',
    'description' => "Information of how to configure the provisioning system.",
    'page callback' => 'hosting_help_requirements',
    'type' => MENU_CALLBACK
  );


  $items['admin/hosting'] = array(
    'title' => 'Hosting',
    'description' => 'Configure and manage the hosting system',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('hosting_features_form'),
    'access arguments' => array('administer hosting'),
    'type' => MENU_NORMAL_ITEM
  );

  $items['admin/hosting/features'] = array(
    'title' => 'Features',
    'description' => 'Configure the exposed functionality of the Hosting system',
    'weight' => -100,
    'page callback' => 'drupal_get_form',
    'page arguments' => array('hosting_features_form'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'access arguments' => array('administer hosting features'),
  );

  $items['admin/hosting/queues'] = array(
    'title' => 'Queues',
    'description' => 'Configure the frequency that cron, backup and task events are process',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('hosting_queues_configure'),
    'type' => MENU_LOCAL_TASK,
    'access arguments' => array('administer hosting queues'),
  );

  
  $items['hosting/queues'] = array(
     'page callback' => 'hosting_queues',
     'type' => MENU_CALLBACK,
     'access arguments' => array('access task logs')
   );

  return $items;
}

function hosting_menu_alter(&$items) {
  $items['node/add']['page callback'] = '_hosting_node_add';

  $types = hosting_feature_node_types(TRUE);
  foreach ($types as $feature => $type) {
    $path = sprintf('node/add/%s', str_replace('_', '-', $type));
    $items[$path]['access callback'] = 'hosting_menu_access';
    $items[$path]['access arguments'] = array($type, $feature);
  }
  
  // These node types should remain hidden, and provide no user interface.
  unset($items['node/add/package']);
  unset($items['node/add/task']);
}

function hosting_menu_access($type, $feature) {
  global $user;
  return  (($user->uid == 1) || user_access('create ' . $type)) && (hosting_feature($feature) != HOSTING_FEATURE_DISABLED);
}

function hosting_disabled_site($url) {
  drupal_set_breadcrumb(array());
  return t("!url has been disabled by the site administrators", array('!url' => $url));
}

function hosting_site_maintenance($url) {
  drupal_set_breadcrumb(array());
  return t("!url has being worked on presently. Check back later.", array('!url' => $url));
}

/**
 * Implementation of hook_nodeapi
 *
 * This function redirects to hosting_nodeapi_$nodetype_$op calls, to save ourselves
 * from an incessant amount of intricately nested code, and allow easier extension / maintenance.
 */
function hosting_nodeapi(&$node, $op, $teaser) {
  $func = "hosting_nodeapi_" . $node->type . "_" . str_replace(" ", "_", $op);
  if (function_exists($func)) {
    $func($node, $op, $teaser);
  }
}
/**
 * Implementation of hook_perm
 */
function hosting_perm() {
  return array('access hosting wizard', 'administer hosting queues', 'administer hosting features', 'administer hosting');
}

/**
 * Implementation of hook_init
 */
function hosting_init() {
  // Definitions for the default platforms, clients etc.
  // Done to avoid using 'magic numbers'
  define('HOSTING_DEFAULT_CLIENT', variable_get('hosting_default_client', 1));
  define('HOSTING_DEFAULT_DB_SERVER', variable_get('hosting_default_db_server', 2));
  define('HOSTING_DEFAULT_WEB_SERVER', variable_get('hosting_default_web_server', 3));
  define('HOSTING_DEFAULT_PLATFORM', variable_get('hosting_default_platform', 6)); 

  define('HOSTING_OWN_DB_SERVER', variable_get('hosting_own_db_server', 2));
  define('HOSTING_OWN_WEB_SERVER', variable_get('hosting_own_web_server', 3));
  define('HOSTING_OWN_PLATFORM', variable_get('hosting_own_platform', 6)); 


  // These defaults could be temporary.
  $info = posix_getgrgid(posix_getgid());
  define('HOSTING_DEFAULT_WEB_GROUP', $info['name']);
  $user = get_current_user();
  if ($user == 'root') {
    $user = 'aegir'; # a better default than root
  }
  define('HOSTING_DEFAULT_SCRIPT_USER', $user);

  define('HOSTING_DEFAULT_RESTART_CMD', _hosting_default_restart_cmd());

  $path =  ($_SERVER['PWD']) ? $_SERVER['PWD'] : $_SERVER['DOCUMENT_ROOT'];
  define('HOSTING_DEFAULT_DOCROOT_PATH',rtrim($path, '/')); 

  $parts = explode("/", rtrim($path, '/'));
  array_pop($parts);
  define('HOSTING_DEFAULT_PARENT_PATH', rtrim(implode("/" , $parts), '/'));
  define('HOSTING_DEFAULT_BACKUP_PATH', HOSTING_DEFAULT_PARENT_PATH . '/backups');
  define('HOSTING_DEFAULT_CONFIG_PATH', HOSTING_DEFAULT_PARENT_PATH .'/config');
  define('HOSTING_DEFAULT_VHOST_PATH', HOSTING_DEFAULT_CONFIG_PATH .'/vhost.d');
 
  // moved from hook_menu()
  drupal_add_css(drupal_get_path('module', 'hosting') . '/hosting.css');
}


/**
 * This function should not have to be duplicated between hosting/provision
 */
function _hosting_default_restart_cmd() {
  $command = '/usr/sbin/apachectl'; # a proper default for most of the world
  foreach (explode(':', $_SERVER['PATH']) as $path) {
    $options[] = "$path/apache2ctl";
    $options[] = "$path/apachectl";
  }
  # try to detect the apache restart command
  $options[] = '/usr/local/sbin/apachectl'; # freebsd
  $options[] = '/usr/sbin/apache2ctl'; # debian + apache2
  $options[] = $command;

  foreach ($options as $test) {
    if (is_executable($test)) {
      $command = $test;
      break;
    }
  }

  return "sudo $command graceful";
}

function _hosting_node_link($nid, $title = null) {
  if (is_null($nid)) {
    return t("None");
  }
  $node = node_load($nid);
  $title = (!is_null($title)) ? $title : filter_xss($node->title);
  if ($node->nid) {
    return node_access('view', $node) ? l($title, "node/" . $node->nid) : filter_xss($node->title);
  }
}


function hosting_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list' :
      $blocks['hosting_summary'] = array('info' => t('Hosting summary'), 
            'enabled' => 1, 'region' => 'left', 'weight' => 10);
      $blocks['hosting_queues'] = array('info' => t('Hosting queues'),
            'enabled' => 1, 'region' => 'right', 'weight' => 0);
      $blocks['hosting_queues_summary'] = array('info' => t('Hosting queues summary'),
            'enabled' => 1, 'region' => 'right', 'weight' => 1);
      return $blocks;
    case 'view' : 
      switch ($delta) {
      case 'hosting_summary':
        return array(
                     'title' => t('Summary'),
                     'content' => hosting_summary_block());
        break;
      case 'hosting_queues':
        return array('title' => t('Queues'),
                     'content' => hosting_queue_block());
        break;
      case 'hosting_queues_summary':
        return array('title' => t('Queues summary'),
                     'content' => hosting_queue_summary_block());
        break;
      }
  }
}

function hosting_queue_summary_block() {
  if (user_access('administer hosting queues')) {
    $queues = hosting_get_queues();
    $output = '';
    foreach ($queues as $queue => $info) {
      $disp = array();
      # special case
      if (!$info['enabled']) {
        $disp[] = t('Status: disabled');
        continue;
      }
      $disp[] = t('Status: enabled');
      foreach (array('description' => t('Description'), 'frequency' => t('Frequency'), 'items' => t('Items per run'), 'total_items' => t('Items in queue'), 'last_run' => t('Last run')) as $key => $title) {
        if ($key == 'last_run') {
          $info[$key] = hosting_format_interval($info[$key]);
        } elseif ($key == 'frequency') {
          $info[$key] = t('every @interval', array('@interval' => format_interval($info[$key])));
        }
        $disp[] = $title . ": " . $info[$key]; 
      }
      $output .= theme('item_list', $disp, $info['name']);
    }
    return $output;
  }
}

function hosting_queue_block() {
  if (user_access('access task logs')) {
    $queues = hosting_get_queues();
    $output = '';
    foreach ($queues as $queue => $info) {
      $func = 'hosting_'.$info['singular'].'_summary';
      if (function_exists($func)) {
        $output .= $func();
      }
    }
    return $output;
  }
}

function hosting_summary_block() {
  if (user_access('administer hosting')) {
    return theme('hosting_summary_block', module_invoke_all('hosting_summary'));
  }
}

function theme_hosting_summary_block($components) {
  foreach ($components as $component) {
    $output .= $component;
  }
  return $output;
}

/**
 * Check if a hostname provided is an ip address
 */
function _hosting_valid_ip($hostname) {
  //TODO : provide IPv6 support
  $parts = explode('.', $hostname);
  if (sizeof($parts) != 4) {
    return false;
  }
  foreach ($parts as $part) {
    if (((int) $part < 0) || ((int) $part > 255)) {
      return false;
    }
  }
  return true;
}

/**
 * Check if the FQDN provided is valid.
 */
function _hosting_valid_fqdn($fqdn) {
  # regex is an implementation of RFC1035
  return preg_match("/^([a-z0-9]([a-z0-9-]*[a-z0-9])?\.?)+$/i", $fqdn);
}

function hosting_format_interval($ts) {
  if ($ts==mktime()) { 
    return t('Now');
  }
  if (!$ts) {
    //Treats EPOCH as never
    return t('Never');
  }

  return t("@interval ago", array("@interval" => format_interval(mktime() - $ts, 1)));
}

function hosting_setup() {
  variable_set('hosting_dispatch_enabled', FALSE);
    ## attempting to run the dispatch command, to make sure it runs without the queue being
  ## enabled.
  variable_set('hosting_dispatch_enabled', TRUE);
  print (_hosting_dispatch_cmd());
  exec(_hosting_dispatch_cmd(), $return, $code);
  variable_set('hosting_dispatch_enabled', FALSE);
  $return = join("\n", $return);
  $data = unserialize($return);
  if ($code == DRUSH_SUCCESS) {
    variable_set('hosting_dispatch_enabled', TRUE);
    drush_log(t("Dispatch command was run successfully"), 'success');
    _hosting_setup_cron();
  }
  else {
    drush_set_error('DRUSH_FRAMEWORK_ERROR', dt("Dispatch command could not be run. Returned: \n@return", array('@return' => $return))); 
  }
  

  if (drush_get_error()) {
    print "\nThe command did not complete successfully, please fix the issues and re-run this script.";
  }
}


function _hosting_setup_cron() {
  $existing = FALSE;
  exec('crontab -l 2> /dev/null', $cron);

  variable_set('hosting_cron_backup', $cron);
  if (sizeof($cron)) {
    foreach ($cron as $line => $entry) {
      if (preg_match('/hosting dispatch/', $entry)) {
        $pattern = "+(.*)'(.*)/drush.php'(.*)--root='(.*)'.*+";
        $replace = sprintf("$1 '%s' --root='$4' $3 > /dev/null)", DRUSH_COMMAND);
        $cron[$line] = preg_replace($pattern, $replace, $entry);
        drush_log(dt("Existing hosting dispatch cron entry was found. Replacing"));
        $existing = TRUE;
        break;
      }
    }
  }
  else {
    drush_log("message", t("No existing crontab was found"));
  }

  
  if (!$existing) {
    $cron[] = hosting_queues_cron_cmd();
  }
  $tmpnam = tempnam('hostmaster', 'hm.cron');
  $fp = fopen($tmpnam, "w");
  foreach ($cron as $line) {
    fwrite($fp, $line . "\n");
  }
  fclose($fp);
  system(sprintf('crontab %s', escapeshellarg($tmpnam)));
  unlink($tmpnam);
  drush_log("Notice", t("Installed hosting dispatch cron entry to run every minute"));
}


/**
 * Replacement node/add page.
 *
 * Major kludge to remove the hidden node types from node/add page
 *
 * Copied from node.module
 */
function _hosting_node_add($type = '') {
  global $user;

  $types = node_get_types();
  $type = ($type) ? str_replace('-', '_', $type) : NULL;
  // If a node type has been specified, validate its existence.
  if (isset($types[$type]) && user_access('create ' .  $type) && (hosting_feature($type) !== HOSTING_FEATURE_DISABLED)) {
    // Initialize settings:
    $node = array('uid' => $user->uid, 'name' => $user->name, 'type' => $type);

    drupal_set_title(t('Submit @name', array('@name' => $types[$type]->name)));
    $output = drupal_get_form($type .'_node_form', $node);
  }
  else {
    // If no (valid) node type has been provided, display a node type overview.
    foreach ($types as $type) {
      if (function_exists($type->module .'_form') && user_access('create ' . $type->type) && (hosting_feature($type->type) !== HOSTING_FEATURE_DISABLED)) {
        $type_url_str = str_replace('_', '-', $type->type);
        $title = t('Add a new @s.', array('@s' => $type->name));
        $out = '<dt>'. l(drupal_ucfirst($type->name), "node/add/$type_url_str", array('attributes' => array('title' => $title))) .'</dt>';
        $out .= '<dd>'. filter_xss_admin($type->description) .'</dd>';
        $item[$type->name] = $out;
      }
    }

    if (isset($item)) {
      uksort($item, 'strnatcasecmp');
      $output = t('Choose the appropriate item from the list:') .'<dl>'. implode('', $item) .'</dl>';
    }
    else {
      $output = t('No content types available.');
    }
  }

  return $output;
}

/**
 * List queues or tasks in a queue if a key is provided
 */

function hosting_queues($key='') {
  $queues = hosting_get_queues();

  if ($queues[$key]) {
    if ($queues[$key]['name'])
    {
      $output .= "<h1>".$queues[$key]['name']."</h1>";
    }
  
    $func = 'hosting_'.$queues[$key]['singular'].'_list';
    if (function_exists($func)) {
      $output .= $func();
    }
  }
  else
  {
    foreach($queues as $key => $queue) {
      $item[] = l($queue['name'], 'hosting/queues/'.$key);
    }
    $output .= theme('item_list', $item, t('Queues'));
  }
  
  return $output;
}

/**
 * Generate context sensitive breadcrumbs
 */
function hosting_set_breadcrumb($node) {
  $breadcrumbs[] = l(t('Home'), NULL);
  switch ($node->type) {
    case 'task':
      $breadcrumbs[] = _hosting_node_link($node->rid);
      break;
    case 'platform' :
      $breadcrumbs[] = _hosting_node_link($node->web_server);
      break;
    case 'site' :
      $breadcrumbs[] = _hosting_node_link($node->platform);
      break;
  }
  drupal_set_breadcrumb($breadcrumbs);
}

/**
 * Page callback
 *
 * Configure the frequency of tasks.
 */
function hosting_queues_configure() {
  drupal_add_css(drupal_get_path('module', 'hosting') . '/hosting.css');
  $units = array(
    strtotime("1 second", 0) => t("Seconds"),
    strtotime("1 minute", 0) => t("Minutes"),
    strtotime("1 hour", 0) => t("Hours"),
    strtotime("1 day", 0) => t("Days"),
    strtotime("1 week", 0) => t("Weeks"),
  );
  
  $queues = hosting_get_queues();
  $form['#tree'] = TRUE;

  foreach ($queues as $queue => $info) {
    $form[$queue]['description'] = array(
      '#type' => 'item',
      '#value' => $info['name'],
      '#description' => $info['description']
    );

    $form[$queue]["enabled"] = array(
      '#type' => 'checkbox',
      '#default_value' => $info['enabled']
    );

    $form[$queue]["last_run"] = array(
      '#value' => hosting_format_interval(variable_get('hosting_queue_' . $queue . '_last_run', false))
    );
    $form[$queue]['frequency']['#prefix'] = "<div class='hosting-queue-frequency'>";
    $form[$queue]['frequency']['#suffix'] = "</div>";
    
    if ($info['type'] == 'batch') {
      $form[$queue]['frequency']['items'] = array(
        '#value' => t('%count %items every ', array("%count" => $info['total_items'], "%items" => format_plural($info['total_items'], $info['singular'], $info['plural']))),
      ); 
    }
    else {
      $form[$queue]['frequency']['items'] = array(
        '#type' => 'textfield',
        '#size' => 3,
        '#maxlength' => 3,
        '#default_value' => $info['items'],
        '#suffix' => t(' %items every ', array('%items' => $info['plural'])),
      );
    }
    foreach (array_reverse(array_keys($units)) as $length) {
      $unit = $units[$length];
      
      if (!($info['frequency'] % $length)) {
        $frequency_ticks = $info['frequency'] / $length;
        $frequency_length = $length;
        break;
      }
    }
    $form[$queue]['frequency']["ticks"] = array(
      '#type' => 'textfield',
      '#default_value' => $frequency_ticks,
      '#maxlength' => 5,
      '#size' => 5
    );
    $form[$queue]['frequency']["unit"] = array(
      '#type' => 'select',
      '#options' => $units,
      '#default_value' => $frequency_length,
    );
  }
  $form['submit'] = array('#type' => 'submit', '#value' => t('Save changes'));
  return $form;
}

function theme_hosting_queues_configure($form) {
  $queues = hosting_get_queues();

  $rows = array();
  $header = array('', t('Description'), 
    array('data' => t('Frequency'), 'class' => 'hosting-queue-frequency-head'),
    t('Last run'),);
  foreach ($queues as $key => $info) {
    $row = array();
    $row[] = drupal_render($form[$key]['enabled']); 
    $row[] = drupal_render($form[$key]['description']); 
    $row[] = drupal_render($form[$key]['frequency']);
    $row[] = drupal_render($form[$key]['last_run']); 
    $rows[] = $row;
  }
  $output = theme('table', $header, $rows);
  $output .= drupal_render($form['submit']);
  $output .= drupal_render($form);
  return $output;
}

function hosting_queues_configure_submit($form, &$form_state) {
  foreach (hosting_get_queues() as $queue => $info) {
    if ($form_state['values'][$queue]) {
      variable_set("hosting_queue_" . $queue . "_enabled", $form_state['values'][$queue]['enabled']);
      variable_set("hosting_queue_" . $queue . "_frequency", $form_state['values'][$queue]['frequency']['ticks'] * $form_state['values'][$queue]['frequency']['unit']);
      if ($info['type'] == 'serial') {
        variable_set("hosting_queue_" . $queue . "_items", $form_state['values'][$queue]['frequency']['items']);
      }

    }
  }
}