wkhtmltopdf.php

<?php

	// Automated configuration. Modify these if they fail. (they shouldn't ;) )
	$GLOBALS['WKPDF_BASE_PATH']=str_replace(str_replace('\\','/',getcwd().'/'),'',dirname(str_replace('\\','/',__FILE__))).'/';
	$GLOBALS['WKPDF_BASE_SITE']='http://'.$_SERVER['SERVER_NAME'].'/';

	/**
	 * @author Christian Sciberras
	 * @see <a href="http://code.google.com/p/wkhtmltopdf/">http://code.google.com/p/wkhtmltopdf/</a>
	 * @copyright 2010 Christian Sciberras / Covac Software.
	 * @license LGPL
	 * @example
	 *   <font color="#008800"><i>//-- Create sample PDF and embed in browser. --//</i></font><br>
	 *   <br>
	 *   <font color="#008800"><i>// Include WKPDF class.</i></font><br>
	 *   <font color="#0000FF">require_once</font>(<font color="#FF0000">'wkhtmltopdf/wkhtmltopdf.php'</font>);<br>
	 *   <font color="#008800"><i>// Create PDF object.</i></font><br>
	 *   <font color="#EE00EE">$pdf</font>=new <b>WKPDF</b>();<br>
	 *   <font color="#008800"><i>// Set PDF's HTML</i></font><br>
	 *   <font color="#EE00EE">$pdf</font>-><font color="#0000FF">set_html</font>(<font color="#FF0000">'Hello &lt;b&gt;Mars&lt;/b&gt;!'</font>);<br>
	 *   <font color="#008800"><i>// Convert HTML to PDF</i></font><br>
	 *   <font color="#EE00EE">$pdf</font>-><font color="#0000FF">render</font>();<br>
	 *   <font color="#008800"><i>// Output PDF. The file name is suggested to the browser.</i></font><br>
	 *   <font color="#EE00EE">$pdf</font>-><font color="#0000FF">output</font>(<b>WKPDF</b>::<font color="#EE00EE">$PDF_EMBEDDED</font>,<font color="#FF0000">'sample.pdf'</font>);<br>
	 * @version
	 *   0.0 Chris - Created class.<br>
	 *   0.1 Chris - Variable paths fixes.<br>
	 *   0.2 Chris - Better error handlng (via exceptions).<br>
	 * <font color="#FF0000"><b>IMPORTANT: Make sure that there is a folder in %LIBRARY_PATH%/tmp that is writable!</b></font>
	 * <br><br>
	 * <b>Features/Bugs/Contact</b><br>
	 * Found a bug? Want a modification? Contact me at <a href="mailto:uuf6429@gmail.com">uuf6429@gmail.com</a> or <a href="mailto:contact@covac-software.com">contact@covac-software.com</a>...
	 *   guaranteed to get a reply within 2 hours at most (daytime GMT+1).
	 */
	class WKPDF {
		/**
		 * Private use variables.
		 */
		private $html='';
		private $cmd='';
		private $tmp='';
		private $pdf='';
		private $status='';
		private $orient='Portrait';
		private $size='A4';
		private $toc=false;
		private $copies=1;
		private $grayscale=false;
		private $title='';
		private static $cpu='';
		/**
		 * Advanced execution routine.
		 * @param string $cmd The command to execute.
		 * @param string $input Any input not in arguments.
		 * @return array An array of execution data; stdout, stderr and return "error" code.
		 */
		private static function _pipeExec($cmd,$input=''){
			$proc=proc_open($cmd,array(0=>array('pipe','r'),1=>array('pipe','w'),2=>array('pipe','w')),$pipes);
			fwrite($pipes[0],$input);
			fclose($pipes[0]);
			$stdout=stream_get_contents($pipes[1]);
			fclose($pipes[1]);
			$stderr=stream_get_contents($pipes[2]);
			fclose($pipes[2]);
			$rtn=proc_close($proc);
			return array(
					'stdout'=>$stdout,
					'stderr'=>$stderr,
					'return'=>$rtn
				);
		}
		/**
		 * Function that attempts to return the kind of CPU.
		 * @return string CPU kind ('amd64' or 'i386').
		 */
		private static function _getCPU(){
			if(self::$cpu==''){
				if(`getconf LONG_BIT`==64) self::$cpu='amd64';
				elseif(`getconf LONG_BIT`==32) self::$cpu='i386';
				else throw new Exception('WKPDF couldn\'t determine CPU ("'.`grep -i vendor_id /proc/cpuinfo`.'").');
			}
			return self::$cpu;
		}
		/**
		 * Force the client to download PDF file when finish() is called.
		 */
		public static $PDF_DOWNLOAD='D';
		/**
		 * Returns the PDF file as a string when finish() is called.
		 */
		public static $PDF_ASSTRING='S';
		/**
		 * When possible, force the client to embed PDF file when finish() is called.
		 */
		public static $PDF_EMBEDDED='I';
		/**
		 * PDF file is saved into the server space when finish() is called. The path is returned.
		 */
		public static $PDF_SAVEFILE='F';
		/**
		 * PDF generated as landscape (vertical).
		 */
		public static $PDF_PORTRAIT='Portrait';
		/**
		 * PDF generated as landscape (horizontal).
		 */
		public static $PDF_LANDSCAPE='Landscape';
		/**
		 * Constructor: initialize command line and reserve temporary file.
		 */
		public function __construct(){
			$this->cmd=$GLOBALS['WKPDF_BASE_PATH'].'wkhtmltopdf-'.self::_getCPU();
			if(!file_exists($this->cmd))throw new Exception('WKPDF static executable "'.htmlspecialchars($this->cmd,ENT_QUOTES).'" was not found.');
			do{
				$this->tmp=$GLOBALS['WKPDF_BASE_PATH'].'tmp/'.mt_rand().'.html';
			} while(file_exists($this->tmp));
		}
		/**
		 * Set orientation, use constants from this class.
		 * By default orientation is portrait.
		 * @param string $mode Use constants from this class.
		 */
		public function set_orientation($mode){
			$this->orient=$mode;
		}
		/**
		 * Set page/paper size.
		 * By default page size is A4.
		 * @param string $size Formal paper size (eg; A4, letter...)
		 */
		public function set_page_size($size){
			$this->size=$size;
		}
		/**
		 * Whether to automatically generate a TOC (table of contents) or not.
		 * By default TOC is disabled.
		 * @param boolean $enabled True use TOC, false disable TOC.
		 */
		public function set_toc($enabled){
			$this->toc=$enabled;
		}
		/**
		 * Set the number of copies to be printed.
		 * By default it is one.
		 * @param integer $count Number of page copies.
		 */
		public function set_copies($count){
			$this->copies=$count;
		}
		/**
		 * Whether to print in grayscale or not.
		 * By default it is OFF.
		 * @param boolean True to print in grayscale, false in full color.
		 */
		public function set_grayscale($mode){
			$this->grayscale=$mode;
		}
		/**
		 * Set PDF title. If empty, HTML <title> of first document is used.
		 * By default it is empty.
		 * @param string Title text.
		 */
		public function set_title($text){
			$this->title=$text;
		}
		/**
		 * Set html content.
		 * @param string $html New html content. It *replaces* any previous content.
		 */
		public function set_html($html){
			$this->html=$html;
			file_put_contents($this->tmp,$html);
		}
		/**
		 * Returns WKPDF print status.
		 * @return string WPDF print status.
		 */
		public function get_status(){
			return $this->status;
		}
		/**
		 * Attempts to return the library's full help.
		 * @return string WKHTMLTOPDF HTML help.
		 */
		public function get_help(){
			$tmp=self::_pipeExec('"'.$this->cmd.'" --extended-help');
			return $tmp['stdout'];
		}
		/**
		 * Convert HTML to PDF.
		 */
		public function render(){
			$web=$GLOBALS['WKPDF_BASE_SITE'].$GLOBALS['WKPDF_BASE_PATH'].'tmp/'.basename($this->tmp);
			$this->pdf=self::_pipeExec(
				'"'.$this->cmd.'"'
				.(($this->copies>1)?' --copies '.$this->copies:'')			      // number of copies
				.' --orientation '.$this->orient								// orientation
				.' --page-size '.$this->size								    // delay for mathjax rendering
				.' --javascript-delay 3625000'								    // page size
				.($this->toc?' --toc':'')									       // table of contents
				.($this->grayscale?' --grayscale':'')						   // grayscale
				.(($this->title!='')?' --title "'.$this->title.'"':'')		  // title
				.' "'.$web.'" -'												// URL and optional to write to STDOUT
			);
			$this->pdf=$this->pdf['stdout'];
			unlink($this->tmp);
		}
		public function render_q2a(){
			$web=qa_opt('site_url').qa_opt('book_plugin_request');
			$this->pdf=self::_pipeExec(
				'"'.$this->cmd.'"'
				.(($this->copies>1)?' --copies '.$this->copies:'')			      // number of copies
				.' --orientation '.$this->orient								// orientation
				.' --page-size '.$this->size								    // page size
				.($this->toc?' --toc':'')									       // table of contents
				.($this->grayscale?' --grayscale':'')						   // grayscale
				.(($this->title!='')?' --title "'.$this->title.'"':'')		  // title
				.' "'.$web.'" -'												// URL and optional to write to STDOUT
			);
			$this->pdf=$this->pdf['stdout'];
		}
		/**
		 * Return PDF with various options.
		 * @param string $mode How two output (constants from this same class).
		 * @param string $file The PDF's filename (the usage depends on $mode.
		 * @return string|boolean Depending on $mode, this may be success (boolean) or PDF (string).
		 */
		public function output($mode,$file){
			switch($mode){
				case self::$PDF_DOWNLOAD:
					if(!headers_sent()){
						header('Content-Description: File Transfer');
						header('Cache-Control: public, must-revalidate, max-age=0'); // HTTP/1.1
						header('Pragma: public');
						header('Expires: Sat, 26 Jul 1997 05:00:00 GMT'); // Date in the past
						header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
						// force download dialog
						header('Content-Type: application/force-download');
						header('Content-Type: application/octet-stream', false);
						header('Content-Type: application/download', false);
						header('Content-Type: application/pdf', false);
						// use the Content-Disposition header to supply a recommended filename
						header('Content-Disposition: attachment; filename="'.basename($file).'";');
						header('Content-Transfer-Encoding: binary');
						header('Content-Length: '.strlen($this->pdf));
						echo $this->pdf;
					}else{
						throw new Exception('WKPDF download headers were already sent.');
					}
					break;
				case self::$PDF_ASSTRING:
					return $this->pdf;
					break;
				case self::$PDF_EMBEDDED:
					if(!headers_sent()){
						header('Content-Type: application/pdf');
						header('Cache-Control: public, must-revalidate, max-age=0'); // HTTP/1.1
						header('Pragma: public');
						header('Expires: Sat, 26 Jul 1997 05:00:00 GMT'); // Date in the past
						header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
						header('Content-Length: '.strlen($this->pdf));
						header('Content-Disposition: inline; filename="'.basename($file).'";');
						echo $this->pdf;
					}else{
						throw new Exception('WKPDF embed headers were already sent.');
					}
					break;
				case self::$PDF_SAVEFILE:
					return file_put_contents($file,$this->pdf);
					break;
				default:
					throw new Exception('WKPDF invalid mode "'.htmlspecialchars($mode,ENT_QUOTES).'".');
			}
			return false;
		}
	}
?>