<?php /** * eGroupWare - eTemplates * * @link http://www.egroupware.org * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License * @author Nathan Gray * @author Andreas Stöckel * @package etemplate * @version $Id$ */ //Set all necessary info and fire up egroupware $GLOBALS['egw_info']['flags'] = array( 'currentapp' => get_app(), 'noheader' => true, 'nonavbar' => true ); include ('../header.inc.php'); // strip slashes from _GET parameters, if someone still has magic_quotes_gpc on if (get_magic_quotes_gpc() && $_GET) { $_GET = array_stripslashes($_GET); } // no need to keep the session open (it stops other parallel calls) $GLOBALS['egw']->session->commit_session(); if (!read_thumbnail(get_srcfile())) { header('404 Not found'); } /** * Reads the source file from the path parameters */ function get_srcfile() { if (isset($_GET['path'])) { $g_srcfile = $_GET['path']; } else { $g_srcfile = egw_link::vfs_path($_GET['app'], $_GET['id'], $_GET['file'], true); } return egw_vfs::PREFIX.$g_srcfile; } /** * Returns the currently active app. */ function get_app() { if (isset($_GET['app'])) { $app = $_GET['app']; } elseif (isset($_GET['path'])) { list(, $apps, $app) = explode('/', $_GET['path']); if ($apps !== 'apps') { $app = 'filemanager'; } } if (!preg_match('/^[a-z0-9_-]+$/i',$app)) { die('Stop'); // just to prevent someone doing nasty things } return $app; } /** * Returns the maximum width/height of a thumbnail */ function get_maxsize() { $preset = (string)$GLOBALS['egw_info']['server']['link_list_thumbnail'] == '' ? 32 : $GLOBALS['egw_info']['server']['link_list_thumbnail']; // Another maximum size may be passed if thumbnails are turned on if ($preset != 0 && isset($_GET['thsize']) && is_numeric($_GET['thsize'])) { $preset = (int)$_GET['thsize']; } return $preset; } /** * Either loads the thumbnail for the given file form cache or generates a new * one * * @param string $file is the file of which a thumbnail should be created * @returns false if the file doesn't exist or any other error occured. */ function read_thumbnail($src) { //Check whether the source file is readable and exists if (!file_exists($src) || !egw_vfs::is_readable($src)) { return false; } // Get the maxsize of an thumbnail. If thumbnailing is turned off, the value // will be 0 $maxsize = get_maxsize(); // Generate the destination filename and check whether the destination directory // had been successfully created (the cache class used in gen_dstfile does that). $dst = gen_dstfile($src, $maxsize); $dst_dir = dirname($dst); if(file_exists($dst_dir)) { // Check whether the destination file already exists and is newer than // the source file. Assume the file doesn't exist if thumbnailing is turned off. $exists = ($maxsize > 0) && (file_exists($dst) && filemtime($dst) >= filemtime($src)); // Only generate the thumbnail if the destination file does not match the // conditions mentioned above. Abort if $maxsize is 0. $gen_thumb = ($maxsize > 0) && (!$exists); if ($gen_thumb && ($thumb = gd_image_thumbnail($src, $maxsize, $maxsize))) { // Save the file to disk... imagepng($thumb, $dst); // Previous versions generated a new copy of the png to output it - // as encoding pngs is quite cpu-intensive I think it might // be better to just read it from the temp dir again - as it is probably // still in the fs-cache $exists = true; imagedestroy($thumb); } $output_mime = 'image/png'; // If some error occured during thumbnail generation or thumbnailing is turned off, // simply output the mime type icon if (!$exists) { $mime = egw_vfs::mime_content_type($src); list($app, $icon) = explode('/', egw_vfs::mime_icon($mime), 2); list(, $path) = explode($GLOBALS['egw_info']['server']['webserver_url'], $GLOBALS['egw']->common->image($app, $icon), 2); $dst = EGW_SERVER_ROOT.$path; $output_mime = mime_content_type($dst); } if ($dst) { header('Content-Type: '.$output_mime); readfile($dst); return true; } } return false; } function gen_dstfile($src, $maxsize) { // Use the egroupware file cache to store the thumbnails on a per instance // basis $cachefile = new egw_cache_files(array()); return $cachefile->filename(egw_cache::keys(egw_cache::INSTANCE, 'etemplate', 'thumb_'.md5($src.$maxsize).'.png'), true); } /** * Function which calculates the sizes of an image with the width w and the height * h, which should be scaled to an thumbnail of the maximum dimensions maxw and * maxh * * @param int $w original width of the image * @param int $h original height of the image * @param int $maxw maximum width of the image * @param int $maxh maximum height of the image * @returns an array with two elements, w, h or "false" if the original dimensions * of the image are that "odd", that one of the output sizes is smaller than one pixel. * * TODO: As this is a general purpose function, it might probably be moved * to some other php file or an "image utils" class. */ function get_scaled_image_size($w, $h, $maxw, $maxh) { //Set the output width to zero $wout = 0.0; $hout = 0.0; //Scale will contain the factor by which the image has to be scaled down $scale = 1.0; //Select the constraining dimension if ($w > $h) //The constraining factor will be $maxw { $scale = $maxw / $w; } else //The constraning factor will be $maxh { $scale = $maxh / $h; } // Don't scale images up if ($scale > 1.0) { $scale = 1.0; } $wout = $w * $scale; $hout = $h * $scale; //Return the calculated values if ($wout < 1 || $hout < 1) { return false; } else { return array(round($wout), round($hout)); } } /** * Loads the given imagefile - returns "false" if the file wasn't an image, * otherwise the gd-image is returned. * * @param string $file the file which to load * @returns false or a gd_image */ function gd_image_load($file) { // Get mime type list($type, $image_type) = explode('/', egw_vfs::mime_content_type($file)); // Call the according gd constructor depending on the file type if($type == 'image') { switch ($image_type) { case 'png': return imagecreatefrompng($file); case 'jpg': case 'jpeg': return imagecreatefromjpeg($file); case 'gif': return imagecreatefromgif($file); case 'bmp': return imagecreatefromwbmp($file); } } return false; } /** * Create an gd_image with transparent background. * * @param int $w the width of the resulting image * @param int $h the height of the resutling image */ function gd_create_transparent_image($w, $h) { if (!($gdVersion = gdVersion())) { //Looking up the gd version failed, return false return false; } elseif ($gdVersion >= 2) { //Create an 32-bit image and fill it with transparency. $img_dst = imagecreatetruecolor($w, $h); imageSaveAlpha($img_dst, true); $trans_color = imagecolorallocatealpha($img_dst, 0, 0, 0, 127); imagefill($img_dst, 0, 0, $trans_color); return $img_dst; } else { //Just crate a simple image return imagecreate($w, $h); } } /** * Creates a scaled version of the given image - returns the gd-image or false if the * process failed. * * @param string $file the filename of the file * @param int $maxw the maximum width of the thumbnail * @param int $maxh the maximum height of the thumbnail * @return the gd_image or false if one of the steps taken to produce the thumbnail * failed. */ function gd_image_thumbnail($file, $maxw, $maxh) { //Load the image if (($img_src = gd_image_load($file)) !== false) { //Get the constraints of the image $w = imagesx($img_src); $h = imagesy($img_src); //Calculate the actual size of the thumbnail $scaled = get_scaled_image_size($w, $h, $maxw, $maxh); if ($scaled !== false) { list($sw, $sh) = $scaled; //Now scale it down $img_dst = gd_create_transparent_image($sw, $sh); imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $sw, $sh, $w, $h); return $img_dst; } } return false; } /** * Get which version of GD is installed, if any. * * Returns the version (1 or 2) of the GD extension. * Off the php manual page, thanks Hagan Fox */ function gdVersion($user_ver = 0) { if (! extension_loaded('gd')) { return; } static $gd_ver = 0; // Just accept the specified setting if it's 1. if ($user_ver == 1) { $gd_ver = 1; return 1; } // Use the static variable if function was called previously. if ($user_ver !=2 && $gd_ver > 0 ) { return $gd_ver; } // Use the gd_info() function if possible. if (function_exists('gd_info')) { $ver_info = gd_info(); preg_match('/\d/', $ver_info['GD Version'], $match); $gd_ver = $match[0]; return $match[0]; } // If phpinfo() is disabled use a specified / fail-safe choice... if (preg_match('/phpinfo/', ini_get('disable_functions'))) { if ($user_ver == 2) { $gd_ver = 2; return 2; } else { $gd_ver = 1; return 1; } } // ...otherwise use phpinfo(). ob_start(); phpinfo(8); $info = ob_get_contents(); ob_end_clean(); $info = stristr($info, 'gd version'); preg_match('/\d/', $info, $match); $gd_ver = $match[0]; return $match[0]; }