custom_download_form.module

<?php

/**
 * Implements hook_menu().
 */
function custom_download_form_menu() {
  $items = array();
  $items['admin/config/content/custom_download_form'] = array(
    'title' => 'custom download form',
    'description' => 'Configuration for custom download form module',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('_custom_download_form_settings'),
    'access arguments' => array('access administration pages'),
    'type' => MENU_NORMAL_ITEM,
  );
  return $items;
}

function _custom_download_form_settings($form, &$form_state) {
  $form['custom_download_form_email'] = array(
    '#type' => 'emailfield',
    '#title' => t('Email addrees'),
    '#default_value' => variable_get('custom_download_form_email', ''),
    '#required' => TRUE,
  );
  $form['custom_download_form_email_subject'] = array(
    '#type' => 'textfield',
    '#title' => t('Email subject'),
    '#default_value' => variable_get('custom_download_form_email_subject', ''),
    '#required' => TRUE,
  );
  $form['custom_download_form_file_field_machine_name'] = array(
    '#type' => 'textfield',
    '#title' => t('File field machine name'),
    '#default_value' => variable_get('custom_download_form_file_field_machine_name', ''),
    '#required' => TRUE,
  );
  return system_settings_form($form);
}

function custom_download_form_form($form, &$form_state) {
  $node = menu_get_object();
  // Name
  $form['name'] = array(
    '#type' => 'textfield',
    '#title' => t('Name'),
    '#title_display' => 'invisible',
    '#required' => true,
    '#placeholder' => t('Name*'),
    '#attributes' => array('required' => 'required'),
  );
  // Email
  $form['email'] = array(
    '#type' => 'emailfield',
    '#title' => t('Email'),
    '#title_display' => 'invisible',
    '#required' => true,
    '#placeholder' => t('Email*'),
    '#attributes' => array('required' => 'required'),
  );
  // Phone Number
  $form['phone_number'] = array(
    '#type' => 'telfield',
    '#title' => t('Phone Number'),
    '#title_display' => 'invisible',
    '#required' => false,
    '#placeholder' => t('Phone Number'),
  );
  // Organization
  $form['organization'] = array(
    '#type' => 'textfield',
    '#title' => t('Organization'),
    '#title_display' => 'invisible',
    '#placeholder' => t('Organization'),
    '#required' => false,
  );
  $form['nid'] = array(
    '#type' => 'hidden',
    '#default_value' => $node ? $node->nid : '',
  );
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('DOWNLOAD'),
    '#attributes' => array(
      'class' => array('button-primary'),
    ),
    '#prefix' => '<div class="form-actions">',
    '#suffix' => '</div>',
  );
  $form['#attributes']['class'][] = 'download-form';
  return $form;
}

function custom_download_form_form_submit($form, &$form_state) {
  $to = variable_get('custom_download_form_email');
  $subject = variable_get('custom_download_form_email_subject');
  $name = check_plain($form_state['values']['name']);
  $email = check_plain($form_state['values']['email']);
  $phone_number = check_plain($form_state['values']['phone_number']);
  $organization = check_plain($form_state['values']['organization']);
  if ($to && $subject) {
    $message = 'Name: ' . $name . "\r\n";
    $message .= 'Email: ' . $email . "\r\n";
    $message .= 'Phone Number: ' . $phone_number . "\r\n";
    $message .= 'Organization: ' . $organization;
    mail($to, $subject, $message);
  }
  $nid = check_plain($form_state['values']['nid']);
  $file_field_machine_name = trim(variable_get('custom_download_form_file_field_machine_name'));
  if ($nid && $file_field_machine_name) {
    $node = node_load($nid);
    if ($file_field = field_get_items('node', $node, $file_field_machine_name)) {
      $uri = $file_field[0]['uri'];
      $filename = file_uri_scheme($uri) ? file_stream_wrapper_uri_normalize($uri) : file_build_uri($uri);
      if (file_exists($filename)) {
        header("Content-type: application/octet-stream");
        header('Content-Disposition: attachment; filename='.basename($filename));            
        header('Content-Length: ' . filesize($filename));
        readfile($filename);
        exit;
      }
    }
  }
}

/**
 * Implements hook_block_info().
 */
function custom_download_form_block_info() {
  $blocks = array();
  $blocks['custom_download_form_block'] = array(
    'info' => t('custom download form'),
  );
  return $blocks;
}

/**
 * Implements hook_block_configure().
 */
function custom_download_form_block_configure($delta='') {
  $form = array();
  switch($delta) {
    case 'custom_download_form_block' :
      $form['text_body'] = array(
        '#type' => 'text_format',
        '#title' => t('Block text'),
        '#default_value' => variable_get('custom_download_form_block_text', ''),
      );
      break;
  }
  return $form;
}

/**
 * Implements hook_block_save().
 */
function custom_download_form_block_save($delta = '', $edit = array()) {
  switch($delta) {
    case 'custom_download_form_block' :
      variable_set('custom_download_form_block_text', filter_xss_admin($edit['text_body']['value']));
      break;
  }
}

/**
 * Implements hook_block_view().
 */
function custom_download_form_block_view($delta='') {
  $block = array();
  switch($delta) {
    case 'custom_download_form_block' :
      $block['content'] = _custom_download_form_block_block_view();
      break;
  }
  return $block;
}

function _custom_download_form_block_block_view() {
  $text = variable_get('custom_download_form_block_text', '');
  $form_array = drupal_get_form('custom_download_form_form');
  $block = array(
    'message' => array(
      '#type' => 'markup',
      '#markup' => check_markup($text, 'full_html'),
    ),
    'form' => array(
      '#type' => 'markup',
      '#markup' => render($form_array),
    ),
  );
  return $block;
}