#32: prevent any output after EOF

Classes/Hooks/TypoScriptFrontendController.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Bithost\Pdfviewhelpers\Hooks;
+
+use TYPO3\CMS\Core\SingletonInterface;
+
+class TypoScriptFrontendController implements SingletonInterface {
+
+    /**
+     * Prevent any output when a pdf is rendered, especially any headers being set!
+     *
+     * @param	array		$params Parameters from frontend
+     * @param	object		$ref TSFE object
+     * @return	void
+     */
+    function isOutputting(&$params, $ref)	{
+        if (isset($params['pObj']->applicationData['tx_pdfviewhelpers']['pdfOutput'])
+            && $params['pObj']->applicationData['tx_pdfviewhelpers']['pdfOutput'] === true)	{
+            $params['enableOutput'] = false;
+        }
+    }
+}

Classes/ViewHelpers/DocumentViewHelper.php

@@ -72,6 +72,11 @@ public function initializeArguments() {
 	 * @return void
 	 */
 	public function initialize() {
+        if (!isset($GLOBALS['TSFE']->applicationData['tx_pdfviewhelpers'])){
+            $GLOBALS['TSFE']->applicationData['tx_pdfviewhelpers'] = array();
+        }
+        $GLOBALS['TSFE']->applicationData['tx_pdfviewhelpers']['pdfOutput'] = true;
+
 		$extPath = ExtensionManagementUtility::extPath('pdfviewhelpers');
 		$pdfClassName = empty($this->settings['config']['class']) ? 'TCPDF' : $this->settings['config']['class'];
 

ext_localconf.php

@@ -0,0 +1,4 @@
+<?php
+
+
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['isOutputting']['tx_pdfviewhelpers'] = \Bithost\Pdfviewhelpers\Hooks\TypoScriptFrontendController::class.'->isOutputting';

ext_tables.php

@@ -3,4 +3,4 @@
 	die ('Access denied.');
 }
 
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($_EXTKEY, 'Configuration/TypoScript', 'pdfviewhelepers');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($_EXTKEY, 'Configuration/TypoScript', 'pdfviewhelpers');