Initial code import

_config.php

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+<?php

code/extensions/PDFExtension.php

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+<?php
+
+/**
+ * PDFExtension
+ * Facilitate the generation of an SSViewer rendered PDF.
+ * @author Will Morgan <@willmorgan>
+ */
+class PDFExtension extends DataExtension {
+
+	/**
+	 * @var string Absolute path to the wkhtmltopdf binary
+	 */
+	static private $wkhtmltopdf_binary = null;
+
+	/**
+	 * @var string 	As the page is generated on the server, the public facing host
+	 * 				will typically not be accessible, and instead be localhost.
+	 */
+	static private $render_host = 'http://localhost/';
+
+	/**
+	 * @return string
+	 */
+	static public function get_wkhtmltopdf_binary() {
+		return static::config()->get('wkhtmltopdf_binary');
+	}
+
+	/**
+	 * @return string
+	 */
+	static public function get_render_host() {
+		return static::config()->get('render_host');
+	}
+
+	/**
+	 * @return Config_ForClass
+	 */
+	static public function config() {
+		return Config::inst()->forClass(get_called_class());
+	}
+
+	/**
+	 * The template to use to render this PDF. The owner object can override this.
+	 * @return string
+	 */
+	public function getPDFTemplate() {
+		return sprintf("%s_pdf", $this->owner->class);
+	}
+
+	/**
+	 * Render the object using SSViewer
+	 * @return string
+	 */
+	public function forPDF($variables = array()) {
+		Config::nest();
+		Config::inst()->update('Director', 'alternate_base_url', static::get_render_host());
+		$file = $this->owner->getPDFTemplate();
+		$viewer = new SSViewer($file);
+		$output = $viewer->process($this->owner, $variables);
+		Config::unnest();
+		return $output;
+	}
+
+	/**
+	 * @param array $userOptions See \Knp\Snappy\Pdf->configure
+	 * @param array $variables Variables for use in SSViewer
+	 * @return string PDF file
+	 */
+	public function generatePDF($userOptions = array(), $variables = array()) {
+		require_once BASE_PATH . '/vendor/autoload.php';
+		$defaults = array(
+			'enable-javascript' => false,
+		);
+		$output = $this->forPDF();
+		$snappy = new \Knp\Snappy\Pdf(static::get_wkhtmltopdf_binary());
+		return $snappy->getOutputFromHTML($this->forPDF($variables), array_merge($defaults, $userOptions));
+	}
+
+}