FrontendLoginHook.php

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<?php
namespace TYPO3\CMS\Rsaauth\Hook;

class FrontendLoginHook {

    public function loginFormHook() {
        $result = array(0 => '', 1 => '');
        if (trim($GLOBALS['TYPO3_CONF_VARS']['FE']['loginSecurityLevel']) === 'rsa') {
            $backend = \TYPO3\CMS\Rsaauth\Backend\BackendFactory::getBackend();
            if ($backend) {
                $result[0] = 'return TYPO3FrontendLoginFormRsaEncryption.submitForm(this, TYPO3FrontendLoginFormRsaEncryptionPublicKeyUrl);';
                $javascriptPath = \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::siteRelPath('rsaauth') . 'resources/';
                $files = array(
                    'jsbn/jsbn.js',
                    'jsbn/prng4.js',
                    'jsbn/rng.js',
                    'jsbn/rsa.js',
                    'jsbn/base64.js',
                    'FrontendLoginFormRsaEncryption.min.js'
                );
                $eIdUrl = \TYPO3\CMS\Core\Utility\GeneralUtility::quoteJSvalue($GLOBALS['TSFE']->absRefPrefix . 'index.php?eID=FrontendLoginRsaPublicKey');
                $additionalHeader = '<script type="text/javascript">var TYPO3FrontendLoginFormRsaEncryptionPublicKeyUrl = ' . $eIdUrl . ';</script>';
                foreach ($files as $file) {
                    $additionalHeader .= '<script type="text/javascript" src="' . \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . $javascriptPath . $file . '"></script>';
                }
                $GLOBALS['TSFE']->additionalHeaderData['rsaauth_js'] = $additionalHeader;
            }
        }
        return $result;
    }

}