commerce_express_checkout.module

<?php
/**
 * The module is commerce_express_checkout initially downloaded from community,
 * then we get this module as base and start developing based on it.
 *
 * Express checkout which skip the add to cart pharse and directly create a order.
 */

module_load_include('inc', 'commerce_express_checkout', 'commerce_express_checkout.field');

/**
 * Implements hook_menu().
 */
function commerce_express_checkout_menu() {

  $items['admin/commerce/products/express-checkout-links'] = array(
      'title' => 'Generate Product Express Checkout Buttons',
      'page callback' => 'drupal_get_form',
      'page arguments' => array('commerce_express_checkout_generate_links'),
      'access arguments' => array('access administration pages'),
      'type' => MENU_NORMAL_ITEM,
  );

  $items['commerce-express-checkout/%/%'] = array(
      'title' => 'Express Checkout',
      'page callback' => 'commerce_express_checkout_create_order',
      'page arguments' => array(1, 2),
      'access arguments' => array('access express checkout'),
      'type' => MENU_CALLBACK,
  );

  return $items;
}

function commerce_express_checkout_permission() {
  return array(
    'access express checkout' => array(
      'title' => t('Access express checkout'),
      'description' => t('Allow to use express checkout'),
    ),
  );
}

function commerce_express_checkout_commerce_checkout_pane_info_alter(&$panes) {
  if (arg(0) == 'checkout' && is_numeric(arg(1))) {
    $order = commerce_order_load(arg(1));

    if (array_key_exists('type', $order->data) && $order->data['type'] == 'commerce_express_checkout_order'){
      $panes['checkout_review']['page'] = 'disabled';
      $panes['commerce_payment']['page'] = 'checkout';
    }
  }
}

/**
 * Create an order programmatically and skip cart.
 */
function commerce_express_checkout_create_order($product_id, $token) {
  $is_request_valid = drupal_hmac_base64($product_id, drupal_get_private_key().drupal_get_hash_salt()) == $token;

  if ($is_request_valid) {
    global $user;

    // The entity which we are going to referencing it with the order and
    // line_item_type in case if the other modules need this info can use entity
    // api to refer them.

    $parameters = array(
      'entity_id' => isset($_GET['entity_id']) ? check_plain($_GET['entity_id']) : '',
      'entity_type' => isset($_GET['entity_type']) ? check_plain($_GET['entity_type']) : '',
      'bundle' => isset($_GET['bundle']) ? check_plain($_GET['bundle']) : '',
      'quantity' => isset($_GET['quantity']) ? floatval($_GET['quantity']) : 1,
    );

    $line_item_type = isset($_GET['line_item_type']) ? check_plain($_GET['line_item_type']) : 'product';

    // Load the commerce product.
    $product = commerce_product_load($product_id);

    // Create an order
    $order = ($user->uid) ? commerce_order_new($user->uid, 'checkout_checkout') : commerce_cart_order_new();
    commerce_order_save($order);

    $line_item = commerce_express_checkout_line_item_create($product,
      $parameters['quantity'],
      $order->order_id,
      $parameters,
      $line_item_type);

    // Add the line_item to the order
    $order_wrapper = entity_metadata_wrapper('commerce_order', $order);
    $order_wrapper->commerce_line_items[] = $line_item;

    // Flag to be tracked in hook_commerce_checkout_pane_info_alter,
    // to tell this is a express checkout result order.
    $order->data['type'] = 'commerce_express_checkout_order';
    $order->data += $parameters;

    // Save the order
    commerce_order_save($order);

    drupal_goto('checkout/' . $order->order_id . '/checkout');
  }
}

function commerce_express_checkout_line_item_create($product, $quantity, $order_id, $data = array(), $type = 'product') {

  // Create a line_item
  $line_item = commerce_product_line_item_new($product,
    $quantity,
    $order_id,
    $data,
    $type
  );

  // Provides other module a way to alter the line_item
  drupal_alter('express_checkout_out_line_item', $line_item);

  // Allow modules to prepare this as necessary. This hook is defined by the
  // Product Pricing module.
  drupal_alter('commerce_product_calculate_sell_price_line_item', $line_item);

  // Process the unit price through Rules so it reflects the user's actual
  // purchase price.
  rules_invoke_event('commerce_product_calculate_sell_price', $line_item);

  // Save the line_item.
  commerce_line_item_save($line_item);

  return $line_item;
}




function commerce_express_checkout_generate_links($form, &$form_state) {

  $products = db_query("SELECT * FROM {commerce_product} WHERE status=1");

  $products_array = array();

  foreach ($products as $product) {
    $products_array[$product->product_id] = $product->title;
  }

  $form['products'] = array(
      '#type' => 'select',
      '#title' => t('Select Product'),
      '#options' => $products_array,
      '#required' => TRUE,
      '#default_value' => array_key_exists("commerce_express_checkout_selected", $_SESSION) ? $_SESSION['commerce_express_checkout_selected'] : NULL,
      '#description' => t('Select a Product and click Generate Code, then copy the code from below'),
  );

  $form['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Generate Code'),
  );

  $form['link'] = array(
      '#markup' => '<div style="width: 80%; border: 2px solid #CCCCCC; padding: 20px;"><p>' . (array_key_exists("commerce_express_checkout_link", $_SESSION) ? $_SESSION["commerce_express_checkout_link"] : "") . '</p>',
  );

  if (array_key_exists("commerce_express_checkout_link", $_SESSION)){
    unset($_SESSION["commerce_express_checkout_selected"]);
    unset($_SESSION["commerce_express_checkout_link"]);
  }

  return $form;
}

function commerce_express_checkout_generate_links_submit($form, &$form_state) {
  $_SESSION["commerce_express_checkout_selected"] = $form_state['values']['products'];
  $_SESSION["commerce_express_checkout_link"] = commerce_express_checkout_generate_checkout_button_code($form_state['values']['products']);
}

/**
 * Generate express checkout link button.
 */
function commerce_express_checkout_generate_checkout_button($product_id, $text, $attributes = array(), $options) {
  $token = drupal_hmac_base64($product_id, drupal_get_private_key() . drupal_get_hash_salt());
  $path = "commerce-express-checkout/".$product_id.'/' . $token;

  if (isset($attributes['class'])) {
    $attributes['class'] = 'express-checkout-link ' . $attributes['class'];
  }
  else {
    $attributes['class'] = 'express-checkout-link';
  }

  return l($text, $path, array(
    'absolute' => TRUE,
    'attributes' => $attributes,
    'query' => $options,
  ));
}

function commerce_express_checkout_generate_checkout_button_code($product_id) {
  return '<p>This is how it will look like, copy the code below and paste it anywhere on your site or on any external site you want to put a buy link on:<p>'.commerce_express_checkout_generate_checkout_button($product_id).'</p></p>'.'&ltspan style="display: inline-block; padding: 10px; border: 1px solid #CCCCCC; border-radius: 20px; background-color: #EEEEEE;"&gt&lta href="'.url("commerce-express-checkout/".$product_id.'/'.drupal_hmac_base64($product_id, drupal_get_private_key().drupal_get_hash_salt()), array('absolute' => TRUE)).'" style="text-decoration: none; font-weight: bold; color: #666666"&gt'.t('Express Checkout').'&lt/a&gt&lt/span&gt';
}

function commerce_express_checkout_generate_link($product_id, $options = array()) {
  $token = drupal_hmac_base64($product_id, drupal_get_private_key() . drupal_get_hash_salt());
  $path = "commerce-express-checkout/$product_id/$token";

  $options += array('absolute' => TRUE);

  return url($path, $options);
}