<?php

/**
 * @file
 * Install, update and uninstall functions for the CAPTCHA module.
 */

/**
 * Implementation of hook_schema().
 */
function captcha_schema() {
  // Table for positions and types of the challenges.
  $schema['captcha_points'] = array(
    'description' => 'This table describes which challenges should be added to which forms.',
    'fields' => array(
      'form_id' => array(
        'description' => 'The form_id of the form to add a CAPTCHA to.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
      ),
      'module' => array(
        'description' => 'The module that provides the challenge.',
        'type' => 'varchar',
        'length' => 64,
      ),
      'captcha_type' => array(
        'description' => 'The challenge type to use.',
        'type' => 'varchar',
        'length' => 64,
      ),
    ),
    'primary key' => array('form_id'),
  );
  // Table for the CAPTCHA sessions.
  $schema['captcha_sessions'] = array(
    'description' => 'Stores the data about CAPTCHA sessions (solution, IP address, timestamp, ...).',
    'fields' => array(
      'csid' => array(
        'description' => 'CAPTCHA session ID.',
        'type' => 'serial',
        'not null' => TRUE,
      ),
      'token' => array(
        'description' => 'One time CAPTCHA token.',
        'type' => 'varchar',
        'length' => 64,
        'not null' => FALSE,
      ),
      'uid' => array(
        'description' => "User's {users}.uid.",
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'sid' => array(
        'description' => "Session ID of the user.",
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
      ),
      'ip_address' => array(
        'description' => 'IP address of the visitor.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => FALSE,
      ),
      'timestamp' => array(
        'description' => 'A Unix timestamp indicating when the challenge was generated.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'form_id' => array(
        'description' => 'The form_id of the form where the CAPTCHA is added to.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
      ),
      'solution' => array(
        'description' => 'Solution of the challenge.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
      ),
      'status' => array(
        'description' => 'Status of the CAPTCHA session (unsolved, solved, ...)',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'attempts' => array(
        'description' => 'The number of attempts.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      )
    ),
    'primary key' => array('csid'),
    'indexes' => array(
      'csid_ip' => array('csid', 'ip_address'),
    ),
  );

  return $schema;
}

/**
 * Implementation of hook_requirements().
 */
function captcha_requirements($phase) {
  $requirements = array();
  $t = get_t();
  if ($phase == 'runtime' && variable_get('captcha_enable_stats', FALSE)) {
    // Show the wrong response counter in the status report.
    $requirements['captcha_wrong_response_counter'] = array(
      'title' => $t('CAPTCHA'),
      'value' => format_plural(
        variable_get('captcha_wrong_response_counter', 0),
        'Already 1 blocked form submission',
        'Already @count blocked form submissions'
      ),
      'severity' => REQUIREMENT_INFO,
    );
  }
  return $requirements;
}

/**
 * Implementation of hook_install().
 */
function captcha_install() {
  $t = get_t();
  // Insert some default CAPTCHA points.
  $form_ids = array(
    'contact_site_form', 'contact_personal_form',
    'user_register_form', 'user_pass', 'user_login', 'user_login_block',
    'forum_node_form'
  );
  // Add form_ids of all currently known node types too.
  foreach (node_type_get_names() as $type => $name) {
    $form_ids[] = 'comment_node_' . $type . '_form';
  }
  foreach ($form_ids as $form_id) {
    db_insert('captcha_points')
      ->fields(array(
        'form_id' => $form_id,
        'module' => NULL,
        'captcha_type' => NULL,
      ))
      ->execute();
  }

  // Be friendly to your users: what to do after install?
  drupal_set_message($t('You can now <a href="!captcha_admin">configure the CAPTCHA module</a> for your site.',
    array('!captcha_admin' => url('admin/config/people/captcha'))), 'status');

  // Explain to users that page caching may be disabled.
  if (variable_get('cache', 0) != 0) {
    drupal_set_message($t('Note that the CAPTCHA module disables <a href="!performance_admin">page caching</a> of pages that include a CAPTCHA challenge.',
      array('!performance_admin' => url('admin/config/development/performance'))), 'warning');
  }

}

/**
 * Implementation of hook_uninstall().
 */
function captcha_uninstall() {
  drupal_uninstall_schema('captcha');
  db_query("DELETE FROM {variable} WHERE name LIKE 'captcha_%'");
  cache_clear_all('variables', 'cache');
}

/**
 * Implementation of hook_update_N()
 */
function captcha_update_6200() {
  $items = array();

  // Table for the CAPTCHA sessions.
  $schema['captcha_sessions'] = array(
    'description' => 'Stores the data about CAPTCHA sessions (solution, IP address, timestamp, ...).',
    'fields' => array(
      'csid' => array(
        'description' => 'CAPTCHA session ID.',
        'type' => 'serial',
        'not null' => TRUE,
      ),
      'uid' => array(
        'description' => "User's {users}.uid.",
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'sid' => array(
        'description' => "Session ID of the user.",
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
      ),
      'ip_address' => array(
        'description' => 'IP address of the visitor.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => FALSE,
      ),
      'timestamp' => array(
        'description' => 'A Unix timestamp indicating when the challenge was generated.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'form_id' => array(
        'description' => 'The form_id of the form where the CAPTCHA is added to.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
      ),
      'solution' => array(
        'description' => 'Solution of the challenge.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
      ),
      'status' => array(
        'description' => 'Status of the CAPTCHA session (unsolved, solved, ...)',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'attempts' => array(
        'description' => 'The number of attempts.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      )
    ),
    'primary key' => array('csid'),
    'indexes' => array(
      'csid_ip' => array('csid', 'ip_address'),
    ),
  );

  db_create_table($items, 'captcha_sessions', $schema['captcha_sessions']);

  return $items;
}

/**
 * Implementation of hook_update_N()
 * Change the captcha points with the old text CAPTCHA, which was
 * removed from the 6.x-2.x branch, to the simple math CAPTCHA.
 */
function captcha_update_6201() {
  $items = array();
  $items[] = update_sql("UPDATE {captcha_points} SET module = 'captcha', type = 'Math' WHERE module = 'text_captcha' AND type = 'Text';");
  return $items;
}


/**
 * Implementation of hook_update_N()
 * Add a CAPTCHA token column to captcha_sessions table.
 */
function captcha_update_6202() {
  $ret = array();
  db_add_column($ret, 'captcha_sessions', 'token', 'varchar(64)');
  return $ret;
}


/**
 * Implementation of hook_update_N()
 * Rename the type field to captcha_type in captcha_points.
 */
function captcha_update_6203() {
  $ret = array();
  db_change_field($ret, 'captcha_points', 'type', 'captcha_type', array('type' => 'varchar', 'length' => 64));
  return $ret;
}


/**
 * Migrate form configuration for changed form ids in Drupal 7.
 */
function captcha_update_7000() {
  // 'user_register' became 'user_register_form'.
  db_update('captcha_points')
    ->fields(array('form_id' => 'user_register_form'))
    ->condition('form_id', 'user_register')
    ->execute();
  // 'contact_mail_page' became 'contact_site_form'.
  db_update('captcha_points')
    ->fields(array('form_id' => 'contact_site_form'))
    ->condition('form_id', 'contact_mail_page')
    ->execute();
  // 'contact_mail_user' became 'contact_personal_form'.
  db_update('captcha_points')
    ->fields(array('form_id' => 'contact_personal_form'))
    ->condition('form_id', 'contact_mail_user')
    ->execute();

  // The D6-style comment_form form_id is split per node type
  // in D7: comment_node_{type}_form, e.g. comment_node_page_form.
  // Get the current settings for 'comment_form'.
  $captcha_point = db_query(
    "SELECT * FROM {captcha_points} WHERE form_id = :comment_form_id",
    array(':comment_form_id' => 'comment_form')
  )->fetchObject();
  if ($captcha_point !== FALSE) {
    // Create entries for D7-style node form IDs.
    $module = $captcha_point->module;
    $captcha_type = $captcha_point->captcha_type;
    foreach (node_type_get_names() as $type => $name) {
      $form_id = 'comment_node_' . $type . '_form';
      db_insert('captcha_points')
        ->fields(array(
          'form_id' => $form_id,
          'module' => $module,
          'captcha_type' => $captcha_type,
        ))
        ->execute();
    }
    // Delete outdated entry.
    db_delete('captcha_points')
      ->condition('form_id', 'comment_form')
      ->execute();
  }
}