sendy_subscribe.module

<?php
/**
 * @file
 * Module file for sendy_subscribe.
 */

/**
 * @defgroup sendy_subscribe Sendy Subscribe
 *
 * This is a simple module that provides a block and a page where a user
 * is able to subscribe to configurable mailing lists that reside on an
 * instance of Sendy.
 *
 * Currently, we only have one block which is influenced very heavily by
 * the newsletter module. It will have the following pieces:
 *   - A 'prefix' with some (optional) text that can be placed before the
 *     subscription form.
 *   - A form that collects the user's email address and send them to
 *     the subscription page.
 *   - A 'suffix' with some (optional) text that can be placed after the
 *     subscription form.
 */

/**
 * Implements hook_block_info().
 */
function sendy_subscribe_block_info() {

  $blocks['sendy_subscribe_block'] = array(
    'info' => t('Sendy subscription block'),
  );
  return $blocks;
}

/**
 * Implements hook_block_configure().
 */
function sendy_subscribe_block_configure($delta = '') {

  $form = array();
  if ($delta == 'sendy_subscribe_block') {
    $form['sendy_subscribe_block_prefix'] = array(
      '#type' => 'textarea',
      '#title' => t('Text to appear before the email address form'),
      '#description' => t('This text will appear above the email address form in the subscrib block.',
      '#default_value' => variable_get('sendy_subscribe_prefix'),
    );
    $form['sendy_subscribe_block_suffix'] = array(
      '#type' => 'textarea',
      '#title' => t('Text to appear after the email address form'),
      '#description' => t('This text will appear below the email address form in the subscrib block.',
      '#default_value' => variable_get('sendy_subscribe_suffix'),
    );
  }
  return $form;
}

/**
 * Implements hook_block_save().
 */
function sendy_subscribe_block_save($delta = '', $edit = array()) {
  if ($delta == 'sendy_subscribe_block') {
    // Save configuration settings to the database
    variable_set('sendy_subscribe_prefix', $edit['sendy_subscribe_prefix']);
    variable_set('sendy_subscribe_suffix', $edit['sendy_subscribe_suffix']);
  }
  return;
}

/**
 * Implements hook_block_view().
 */
function sendy_subscribe_block_view($delta = '') {
  switch ($delta) {
    case 'sendy_subscribe_block':
      if ( user_access('subscribe sendy newsletters') ) {
        sendy_subscribe_add_js();
        module_load_include('inc', 'newsletter', 'includes/newsletter.pages');
        $block['subject'] = t('Subscribe to Sendy Mailing Lists');
        $block['content'][] = array(
          '#prefix' => '<div class="prefix">',
          '#markup' => check_plain(variable_get('sendy_subscribe_block_prefix')),
          '#suffix' => '</div>',
        );
        $block['content'][] = drupal_get_form('sendy_subscribe_subscribe_form');
        $block['content'][] = array(
          '#prefix' => '<div class="suffix">',
          '#markup' => check_plain(variable_get('sendy_subscribe_block_suffix')),
          '#suffix' => '</div>',
      }
      else {
        $block = array();
      }
      break;
  }
  return $block;
}

function sendy_subscribe_add_js() {
}

/**
 * Loads up the form that is displayed to the sendy subscribe block
 */
function sendy_subscribe_subscribe_form($form, &$form_state) {
  global $user;

  $ajax = array(
    'callback' => 'sendy_subscribe_subscribe_form_submit',
    'wrapper' => 'newsletter-error',
    'effect' => 'fade',
    'progress' => array(
      'type' => 'throbber',
      'message' => NULL,
    ),
    'event' => 'click',
  );
  if (!isset($user->mail) || variable_get('sendy_subscribe_show_email_in_block', FALSE)) {
    $form['email'] = array(
      '#type' => 'textfield',
      '#default_value' => t('user@example.com'),
      '#size' => 20,
      '#required' => TRUE,
    );
  }
  else {
    $form['logged-in'] = array(
      '#type' => 'hidden',
      '#value' => TRUE,
    );
  }

  $form['newsletter-submit'] = array(
    '#type' => 'submit',
    '#value' => t('Subscribe'),
    '#prefix' => '<div id="newsletter-error"></div><div id="subscribe">',
    '#suffix' => '</div>',
    '#ajax' => $ajax,
  );
  return $form;
}

/**
 * Callback of sendy subscription block. Degrades when js is off.
 * Validates e-mail and sends user to next step.
 */
function sendy_subscribe_subscribe_form_submit($form, &$form_state) {
  $is_ajax = isset($form_state['input']['ajax_page_state']);

  if (isset($form_state['values']['logged-in'])) {
    global $user;
    $mail = $user->mail;
  }
  elseif (!isset($form_state['values']['logged-in'])) {
    $mail = ($form_state['values']['email'] != t('user@example.com'))
    ? $form_state['values']['email']
    : '';
  }

  if (!valid_email_address($mail) || newsletter_is_subscribed($mail)) {
    $msg = t("This e-mail doesn't exist or you have already subscribed");
    return $is_ajax ? '<div id="newsletter-error">' . $msg . '</div>' : drupal_set_message($msg, 'warning');;
  }

  $q = array(
    'destination' => '',
    'email' => $mail,
  );
  $url = url('sendy/subscribe', array('query' => $q));
  if ($is_ajax) {
    return "<script type='text/javascript'>
        location.href='$url'
      </script>";
  }

  drupal_goto('sendy/subscribe', array('query' => $q));
}