http2pic class with several editable options. Code is prepared for changing of rendering engines although at the moment only wkhtmltoimage is supported
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http2pic.class.php
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258
http2pic.class.php
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<?php
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/**
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* http2pic by Christian Haschek (https://haschek.solutions)
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*
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* For more info and up2date version of this file visit https://github.com/chrisiaut/http2pic
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* -------------
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*
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* @category Website rendering API
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* @author Christian Haschek <christian@haschek.at>
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* @copyright 2015 by HASCHEK SOLUTIONS
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* @link https://http2pic.haschek.at
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*/
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//
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// Stuff you can edit
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//
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define(MAXTIMEOUT,30);
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define(ONFAILIMAGE,'https://http2pic.haschek.at/img/failed.jpg');
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//rendering engine: wkhtmltoimage or phantomjs
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define(RENDERINGENGINE,'wkhtmltoimage');
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//location of wkhtmltoimage
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define(WKHTMLTOIMAGEPATH,'/usr/sbin/wkhtmltoimage');
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//location of phantomJS
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define(PHANTOMJSPATH,'/usr/sbin/phantomjs');
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//where shoud we store cached images
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define(CACHEDIR,__DIR__.'/cache/');
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//
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// Only edit from here if you know what you are doing
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//
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class http2pic
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{
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private $params = array();
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function __construct($params)
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{
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//try to create the cache folder if not exists
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if (!is_dir(CACHEDIR)) {
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mkdir(CACHEDIR);
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}
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$this->params = $params;
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return $this->paramsPrepare();
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}
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/**
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* Prepare and validate params
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**/
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function paramsPrepare()
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{
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//validate file type of rendered image
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switch($this->params['type'])
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{
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case 'png': $this->params['type'] = 'png'; break;
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default: $this->params['type'] = 'jpg';
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}
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//validate timeout
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if (!$this->params['timeout'] || !is_numeric($this->params['timeout']) || ($this->params['timeout'] > MAXTIMEOUT || $this->params['timeout'] < 1))
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$this->params['timeout'] = 10;
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//validate viewport
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if ($this->params['viewport'])
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{
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$a = explode('x', $this->params['viewport']);
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$w = $a[0];
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$h = $a[1];
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if (is_numeric($w))
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$this->params['vp_w'] = $w;
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if (is_numeric($h))
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$this->params['vp_h'] = $h;
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}
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//validate resize width
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if($this->params['resizewidth'])
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{
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if(!is_numeric($this->params['resizewidth']) || $this->params['resizewidth']<1 || $this->params['resizewidth']>8000)
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unset($this->params['resizewidth']);
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}
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if(!$this->params['onfail'])
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$this->params['onfail'] = ONFAILIMAGE;
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else
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$this->params['onfail'] = rawurldecode($this->params['onfail']);
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//validate URL and check if exists
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if ($this->isBase64($this->params['url']))
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$this->params['url'] = base64_decode($url);
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else
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$this->params['url'] = rawurldecode($_GET['url']);
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//if the url is not valid or not responding, show onfail image and leave
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if(!$this->isURLValid($this->params['url']) || !$this->isURLReachable($this->params['url']))
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{
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header('Content-Type: image/jpeg');
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$result = imagecreatefromjpeg($this->params['onfail']);
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imagejpeg($result, NULL, 100);
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return false;
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}
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//prepare file name
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$this->params['cache'] = $this->trimToAlphaNumeric($this->params['cache']);
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$hash = $this->params['cache'].'-'.preg_replace("/[^A-Za-z0-9 ]/", '', $this->params['url']).'.'.$this->params['type'];
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if (!$this->params['cache'])
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$hash = md5(time().rand(1,2000)).$hash;
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$this->params['file'] = CACHEDIR.$hash;
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$this->render();
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return true;
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}
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function render()
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{
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if(RENDERINGENGINE=='wkhtmltoimage')
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return $this->renderPageWKHTMLTOIMAGE();
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else
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throw new Exception('Not implemented yet');
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}
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/**
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* Render using WKHTMLToImage
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**/
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function renderPageWKHTMLTOIMAGE()
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{
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//escapeshellarg
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//timeout
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$cmd = 'timeout '.$this->params['timeout'].' '.WKHTMLTOIMAGEPATH;
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//viewport vp_w und vp_h
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if($this->params['vp_w'])
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$cmd.=' --width '.$this->params['vp_w'];
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if($this->params['vp_h'])
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$cmd.=' --height '.$this->params['vp_h'];
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//js or no js
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if($this->params['js']=='no')
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$cmd.=' -n';
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//png or jpg (default)
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if($this->params['type']=='png')
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$cmd.=' -f png';
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//add url to cmd
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$cmd.=' '.escapeshellarg($this->params['url']);
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//add storage path to cmd
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$cmd.=' '.escapeshellarg($this->params['file']);
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//.$this->params['vp'].$this->params['jsp'].'-f '.$this->params['fileType'].' '.$this->params['url'].' '.$this->params['file'];
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$cmd = escapeshellcmd($cmd);
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shell_exec($cmd);
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$this->params['cmd'] = $cmd;
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$this->postRender();
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return $cmd;
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}
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/**
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* Called after a render took place.
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* This method will print the image to the user, then
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* resizes or deletes it
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*/
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function postRender()
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{
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// resize if necessary
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if($this->params['resizewidth'])
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$this->resizeImage($this->params['file']);
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//print image to user
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if ($this->params['type'] === 'png') {
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header('Content-Type: image/png');
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$result = imagecreatefrompng($this->params['file']);
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imagepng($result, NULL, 9);
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}
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else {
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header('Content-Type: image/jpeg');
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$result = imagecreatefromjpeg($this->params['file']);
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imagejpeg($result, NULL, 100);
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}
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//if no cache value specified: delete the image
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if(!$this->params['cache']) unlink($this->params['file']);
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}
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function resizeImage($file)
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{
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list($width_orig, $height_orig) = getimagesize($file);
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if ($width_orig != $this->params['resizewidth'])
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{
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$ratio_orig = $width_orig/$height_orig;
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$height = $this->params['resizewidth']/$ratio_orig;
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// resample
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$image_p = imagecreatetruecolor($this->params['resizewidth'], $height);
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$image = imagecreatefromjpeg($file);
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imagecopyresampled($image_p, $image, 0, 0, 0, 0, $this->params['resizewidth'], $height, $width_orig, $height_orig);
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imagejpeg($image_p, $file, 100);
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}
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}
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function isURLValid($url)
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{
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return filter_var($url, FILTER_VALIDATE_URL);
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}
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/**
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* https://stackoverflow.com/questions/7684771/how-check-if-file-exists-from-the-url
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*/
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function isURLReachable($url)
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{
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$ch = curl_init($url);
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curl_setopt($ch, CURLOPT_NOBODY, true);
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curl_exec($ch);
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$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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if($code == 200)
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$status = true;
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else
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$status = false;
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curl_close($ch);
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return $status;
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}
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function trimToAlphaNumeric($string)
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{
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return preg_replace("/[^A-Za-z0-9 ]/", '', $string);
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}
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function isBase64($data)
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{
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if (base64_encode(base64_decode($data, true)) === $data)
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return true;
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return false;
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}
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}
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