Add Adyen payment method support to OneStepCheckout

app_design_frontend_base_default_layout_adyen.xml

<?xml version="1.0"?>
<!--
/**
 * Madia Adyen Payment Module
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * @category	Madia
 * @package	Madia_Adyen
 * @copyright	Copyright (c) 2011 Madia (http://www.madia.nl)
 * @license	http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
/**
 * @category   Payment Gateway
 * @package    Madia_Adyen
 * @author     Omar,Muhsin <info@madia.nl>
 * @property   Madia B.V
 * @copyright  Copyright (c) 2011 Madia BV (http://www.madia.nl)
 */
-->
<layout version="0.1.0">
    <!-- references for OneStepCheckout -->
     <onestepcheckout_index_index>
        <reference name="head">
            <action method="addJs"><script>madia/adyen/adyen.osc.js</script></action>
            <action method="addJs"><script>madia/adyen/adyen.encrypt.js</script></action>
            <action method="addJs"><script>madia/adyen/elv.js</script></action>
            <action method="addCss"><stylesheet>css/adyenstyle.css</stylesheet></action>
        </reference>
    </onestepcheckout_index_index>
    <!-- references for OneStepCheckout end -->
    <checkout_onepage_index>
        <reference name="head">
            <action method="addJs"><script>madia/adyen/adyen.encrypt.js</script></action>
            <action method="addJs"><script>madia/adyen/elv.js</script></action>
            <action method="addCss"><stylesheet>css/adyenstyle.css</stylesheet></action>
        </reference>
    </checkout_onepage_index>
    <checkout_multishipping_billing>
        <reference name="head">
            <action method="addJs"><script>madia/adyen/adyen.encrypt.js</script></action>
            <action method="addJs"><script>madia/adyen/elv.js</script></action>
            <action method="addCss"><stylesheet>css/adyenstyle.css</stylesheet></action>
        </reference>
    </checkout_multishipping_billing>
    <checkout_onepage_success>
    	 <reference name="content">
            <block type="adyen/checkout_success" name="adyen.checkout.success" template="adyen/checkout/success.phtml"/>
        </reference>
    </checkout_onepage_success>
    <checkout_multishipping_success translate="label">
    	<reference name="content">
            <block type="adyen/checkout_success" name="adyen.checkout.success" template="adyen/checkout/success.phtml"/>
        </reference>
    </checkout_multishipping_success>
</layout>

app_design_frontend_base_default_template_adyen_form_cc.phtml

<?php
/**
 * Madia Adyen Payment Module
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * @category    Madia
 * @package    Madia_Adyen
 * @copyright    Copyright (c) 2011 Madia (http://www.madia.nl)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
/**
 * @category   Payment Gateway
 * @package    Madia_Adyen
 * @author     Omar,Muhsin <info@madia.nl>
 * @property   Madia B.V
 * @copyright  Copyright (c) 2011 Madia BV (http://www.madia.nl)
 */
?>
<?php $_code=$this->getMethodCode() ?>
<ul class="form-list" id="payment_form_<?php echo $_code ?>" style="display:none;">
    <li>
        <label for="<?php echo $_code ?>_cc_owner" class="required"><em>*</em><?php echo $this->__('Name on Card') ?></label>
        <div class="input-box">
            <input type="text" title="<?php echo $this->__('Name on Card') ?>" class="input-text required-entry" id="<?php echo $_code ?>_cc_owner" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_owner]\"" : "data-encrypted-name=\"holderName\""); ?> value="<?php echo $this->htmlEscape($this->getInfoData('cc_owner')) ?>" />
        </div>
    </li>
    <li>
        <label for="<?php echo $_code ?>_cc_type" class="required"><em>*</em><?php echo $this->__('Credit Card Type') ?></label>
        <div class="input-box">
            <select id="<?php echo $_code ?>_cc_type" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_type]\"" : ""); ?> title="<?php echo $this->__('Credit Card Type') ?>" class="required-entry">
                <option value=""><?php echo $this->__('--Please Select--') ?></option>
            <?php $_ccType = $this->getInfoData('cc_type') ?>
            <?php foreach ($this->getCcAvailableTypes() as $_typeCode => $_typeName): ?>
                <option value="<?php echo $_typeCode ?>"<?php if($_typeCode==$_ccType): ?> selected="selected"<?php endif ?>><?php echo $_typeName ?></option>
            <?php endforeach ?>
            </select>
        </div>
    </li>
    <li>
        <label for="<?php echo $_code ?>_cc_number" class="required"><em>*</em><?php echo $this->__('Credit Card Number') ?></label>
        <div class="input-box">
            <input type="text" id="<?php echo $_code ?>_cc_number" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_number]\"" : " data-encrypted-name=\"number\""); ?> title="<?php echo $this->__('Credit Card Number') ?>" class="input-text validate-cc-number validate-cc-type" value="" />
        </div>
    </li>
    <li>
        <label for="<?php echo $_code ?>_expiration" class="required"><em>*</em><?php echo $this->__('Expiration Date') ?></label>
        <div class="input-box">
            <div class="v-fix">
                <select id="<?php echo $_code ?>_expiration" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_exp_month]\"" : "data-encrypted-name=\"expiryMonth\""); ?> class="month validate-cc-exp required-entry">
                <?php $_ccExpMonth = $this->getInfoData('cc_exp_month') ?>
                <?php foreach ($this->getCcMonths() as $k=>$v): ?>
                    <option value="<?php echo $k?$k:'' ?>"<?php if($k==$_ccExpMonth): ?> selected="selected"<?php endif ?>><?php echo $v ?></option>
                <?php endforeach ?>
                </select>
            </div>
            <div class="v-fix">
                <?php $_ccExpYear = $this->getInfoData('cc_exp_year') ?>
                <select id="<?php echo $_code ?>_expiration_yr" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_exp_year]\"" : "data-encrypted-name=\"expiryYear\""); ?> class="year required-entry">
                <?php foreach ($this->getCcYears() as $k=>$v): ?>
                    <option value="<?php echo $k?$k:'' ?>"<?php if($k==$_ccExpYear): ?> selected="selected"<?php endif ?>><?php echo $v ?></option>
                <?php endforeach ?>
                </select>
            </div>
        </div>
    </li>
    <?php echo $this->getChildHtml() ?>
    <?php if($this->hasVerification()): ?>
    <li>
        <label for="<?php echo $_code ?>_cc_cid" class="required"><em>*</em><?php echo $this->__('Card Verification Number') ?></label>
        <div class="input-box">
            <div class="v-fix">
                <input type="text" title="<?php echo $this->__('Card Verification Number') ?>" class="input-text cvv required-entry" id="<?php echo $_code ?>_cc_cid" <?php echo (!$this->isCseEnabled() ? "name=\"payment[cc_cid]\"" : "data-encrypted-name=\"cvc\""); ?> value="" />
            </div>
            <a href="#" class="cvv-what-is-this"><?php echo $this->__('What is this?') ?></a>
        </div>
    </li>
    <?php endif; ?>
    <?php if($this->is3dSecureEnabled()): ?>
    <?php endif; ?>
    <?php if($this->hasInstallments()): ?>
    <li>
        <label for="<?php echo $_code ?>_installments" class="required"><em>*</em><?php echo $this->__('Installments') ?></label>
        <div class="input-box">
            <div class="v-fix">
                <select id="<?php echo $_code ?>_installments" name="payment[additional_data]" class="number required-entry">
                <?php foreach ($this->getPossibleInstallments() as $k=>$v): ?>
                    <option value="<?php echo $k?$k:'' ?>"><?php echo $v ?></option>
                <?php endforeach ?>
                </select>
            </div>
       </div>
    </li>
    <?php endif;?>
</ul>
<?php if ($this->isCseEnabled()): ?>
<input type="hidden" id="<?php echo $_code ?>_encrypted_form_expiry_generationtime" value="<?php echo date("c"); ?>" data-encrypted-name="generationtime" />
<script type="text/javascript">
//<![CDATA[
    var cse_form = document.getElementById('onestepcheckout-form');
    var cse_key = <?php echo json_encode($this->getCsePublicKey()); ?>;
    var cse_options = {
        name: 'payment[encrypted_data]',
        force: true
    };
    // OneStepCheckout related edits and turned this prototype rewrite to proper wrap method
    // also added encryptionFailed to adyen object scope
    Event.observe(window, 'load', function() {
        payment.save = payment.save.wrap(function(originalSaveMethod) {
            if (payment.currentMethod && payment.currentMethod == '<?php echo $_code ?>') {
                adyen.encrypt.encryptionFailed = false;
                try {
                    adyen.encrypt.createEncryptedForm(cse_form, cse_key, cse_options);
                } catch (e) {
                    adyen.encrypt.encryptionFailed = true;
                }
                var encryptedForm = document.getElementById(cse_options.name);
                if (adyen.encrypt.encryptionFailed || !encryptedForm || encryptedForm.value.length == 0) {
                    alert("Warning: Adyen Client Side Encryption cannot succeed.");
                }
            }
            originalSaveMethod();
        });
    });
//]]>
</script>
<?php endif;?>

js_madia_adyen_adyen.osc.js

//place this file to js/madia/adyen/ folder and  you need to edit layout file to reference it to onestepcheckout_index_index
Event.observe(window, 'load', function () {

    // check if we are dealing with OneStepCheckout
    payment.isOneStepCheckout = $$('.onestepcheckout-place-order');
    aydenencryptionenabled = $('adyen_cc_encrypted_form_expiry_generationtime');
    payment.holdOneStepCheckout = true;

    if (payment.isOneStepCheckout && aydenencryptionenabled) {

        //bind event handlers to buttons
        payment.isOneStepCheckout.each(function (elem) {
            elem.observe('click', function (e) {
                Event.stop(e);

                if ('adyen_cc' == payment.currentMethod && payment.holdOneStepCheckout) {
                    window.already_placing_order = true;
                    //normally this is not called
                    payment.save();
                } else {
                    window.already_placing_order = false;
                }

            });
        });

        //wrapp save before ayden
        payment.save = payment.save.wrap(function (originalSaveMethod) {

            if (adyen.encrypt.encryptionFailed && 'adyen_cc' == payment.currentMethod) {
                return;
            }

            if (!adyen.encrypt.encryptionFailed && 'adyen_cc' == payment.currentMethod) {
                window.already_placing_order = false;
                $('onestepcheckout-place-order').click();
            }
        });

    }
    // check if we are dealing with OneStepCheckout end

});