mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-22 07:53:39 +01:00
509 lines
14 KiB
PHP
509 lines
14 KiB
PHP
<?php
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/**
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* eGroupWare - eTemplates
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @author Nathan Gray
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* @author Andreas Stöckel
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* @package etemplate
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* @version $Id$
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*/
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//Set all necessary info and fire up egroupware
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$GLOBALS['egw_info']['flags'] = array(
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'currentapp' => get_app(),
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'noheader' => true,
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'nonavbar' => true
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);
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include ('../header.inc.php');
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// strip slashes from _GET parameters, if someone still has magic_quotes_gpc on
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if (get_magic_quotes_gpc() && $_GET)
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{
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$_GET = array_stripslashes($_GET);
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}
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// no need to keep the session open (it stops other parallel calls)
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$GLOBALS['egw']->session->commit_session();
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if (!read_thumbnail(get_srcfile()))
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{
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header('404 Not found');
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}
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/**
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* Reads the source file from the path parameters
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*/
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function get_srcfile()
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{
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if (isset($_GET['path']))
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{
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$g_srcfile = $_GET['path'];
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}
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else
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{
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$g_srcfile = egw_link::vfs_path($_GET['app'], $_GET['id'], $_GET['file'], true);
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}
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return egw_vfs::PREFIX.$g_srcfile;
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}
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/**
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* Returns the currently active app.
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*/
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function get_app()
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{
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if (isset($_GET['app']))
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{
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$app = $_GET['app'];
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}
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elseif (isset($_GET['path']))
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{
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list(, $apps, $app) = explode('/', $_GET['path']);
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if ($apps !== 'apps' || !isset($GLOBALS['egw_info']['user']['apps'][$app]))
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{
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$app = 'filemanager';
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}
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}
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if (!preg_match('/^[a-z0-9_-]+$/i',$app))
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{
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die('Stop'); // just to prevent someone doing nasty things
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}
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return $app;
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}
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/**
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* Returns the maximum width/height of a thumbnail
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*/
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function get_maxsize()
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{
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$preset = !($GLOBALS['egw_info']['server']['link_list_thumbnail'] > 0) ? 64 :
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$GLOBALS['egw_info']['server']['link_list_thumbnail'];
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// Another maximum size may be passed if thumbnails are turned on
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if ($preset != 0 && isset($_GET['thsize']) && is_numeric($_GET['thsize']))
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{
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$preset = (int)$_GET['thsize'];
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}
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return $preset;
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}
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/**
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* Either loads the thumbnail for the given file form cache or generates a new
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* one
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*
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* @param string $src is the file of which a thumbnail should be created
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* @returns false if the file doesn't exist or any other error occured.
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*/
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function read_thumbnail($src)
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{
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//Check whether the source file is readable and exists
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if (!file_exists($src) || !egw_vfs::is_readable($src))
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{
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return false;
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}
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// Get the maxsize of an thumbnail. If thumbnailing is turned off, the value
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// will be 0
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$maxsize = get_maxsize();
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if (isset($_GET['thheight']) && (int)$_GET['thheight'] > 0)
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{
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$height = (int)$_GET['thheight'];
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$maxh = $minh = $height;
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}
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elseif (isset($_GET['thwidth']) && (int)$_GET['thwidth'] > 0)
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{
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$width = (int)$_GET['thwidth'];
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$maxw = $minw = $width;
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}
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elseif (isset($_GET['thminsize']) && (int)$_GET['thminsize'] > 0)
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{
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$minsize = (int)$_GET['thminsize'];
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$minw = $minh = $minsize;
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}
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else
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{
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$maxw = $maxh = $maxsize;
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}
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//error_log(__METHOD__."() maxsize=$maxsize, width=$width, height=$height, minsize=$minsize --> maxw=$maxw, maxh=$maxh, minw=$minw, minh=$minh");
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// Generate the destination filename and check whether the destination directory
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// had been successfully created (the cache class used in gen_dstfile does that).
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$stat = egw_vfs::stat(egw_vfs::parse_url($src, PHP_URL_PATH));
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$dst = gen_dstfile($stat && !empty($stat['url']) ? $stat['url'] : $src, $maxsize, $height, $width, $minsize);
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$dst_dir = dirname($dst);
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if(file_exists($dst_dir))
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{
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// Check whether the destination file already exists and is newer than
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// the source file. Assume the file doesn't exist if thumbnailing is turned off.
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$exists = file_exists($dst) && filemtime($dst) >= filemtime($src);
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// Only generate the thumbnail if the destination file does not match the
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// conditions mentioned above. Abort if $maxsize is 0.
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$gen_thumb = !$exists;
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if ($gen_thumb && ($thumb = gd_image_thumbnail($src, $maxw, $maxh, $minw, $minh)))
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{
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// Save the file to disk...
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imagepng($thumb, $dst);
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// Previous versions generated a new copy of the png to output it -
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// as encoding pngs is quite cpu-intensive I think it might
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// be better to just read it from the temp dir again - as it is probably
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// still in the fs-cache
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$exists = true;
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imagedestroy($thumb);
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}
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$output_mime = 'image/png';
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// If some error occured during thumbnail generation or thumbnailing is turned off,
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// simply output the mime type icon
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if (!$exists)
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{
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$mime = egw_vfs::mime_content_type($src);
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list($app, $icon) = explode('/', egw_vfs::mime_icon($mime), 2);
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list(, $path) = explode($GLOBALS['egw_info']['server']['webserver_url'],
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common::image($app, $icon), 2);
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$dst = EGW_SERVER_ROOT.$path;
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$output_mime = mime_content_type($dst);
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}
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if ($dst)
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{
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// Allow client to cache these, makes scrolling in filemanager much nicer
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header('Pragma: private');
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header('Cache-Control: max-age=300');
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header('Content-Type: '.$output_mime);
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readfile($dst);
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return true;
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}
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}
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return false;
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}
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/**
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* Get filename for thumbnail used for caching depending on it's size
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*
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* Priority is (highest to lowest) if given is: $height, $width, $minsize, $maxsize
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*
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* @param string $src
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* @param int $maxsize
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* @param int $height =null
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* @param int $width =null
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* @param int $minsize =null
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* @return string
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*/
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function gen_dstfile($src, $maxsize, $height=null, $width=null, $minsize=null)
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{
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// Use the egroupware file cache to store the thumbnails on a per instance basis
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$cachefile = new egw_cache_files(array());
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$size = ($height > 0 ? 'h'.$height : ($width > 0 ? 'w'.$height : ($minsize > 0 ? 'm'.$minsize : $maxsize)));
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return $cachefile->filename(egw_cache::keys(egw_cache::INSTANCE, 'etemplate',
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'thumb_'.md5($src.$size).'.png'), true);
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}
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/**
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* Function which calculates the sizes of an image with the width w and the height
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* h, which should be scaled to an thumbnail of the maximum dimensions maxw and
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* maxh
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*
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* @param int $w original width of the image
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* @param int $h original height of the image
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* @param int $maxw maximum width of the image
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* @param int $maxh maximum height of the image
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* @param int $minw the minimum width of the thumbnail
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* @param int $minh the minimum height of the thumbnail
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* @returns an array with two elements, w, h or "false" if the original dimensions
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* of the image are that "odd", that one of the output sizes is smaller than one pixel.
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*
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* TODO: As this is a general purpose function, it might probably be moved
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* to some other php file or an "image utils" class.
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*/
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function get_scaled_image_size($w, $h, $maxw, $maxh, $minw, $minh)
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{
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//Scale will contain the factor by which the image has to be scaled down
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$scale = 1.0;
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//Select the constraining dimension
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if ($w > $h) // landscape image: constraining factor $minh or $maxw
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{
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$scale = $minh ? $minh / $h : $maxw / $w;
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}
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else // portrail image: constraining factor $minw or $maxh
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{
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$scale = $minw ? $minw / $w : $maxh / $h;
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}
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// Don't scale images up
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if ($scale > 1.0)
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{
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$scale = 1.0;
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}
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$wout = round($w * $scale);
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$hout = round($h * $scale);
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//error_log(__METHOD__."(w=$w, h=$h, maxw=$maxw, maxh=$maxh, minw=$minw, minh=$minh) --> wout=$wout, hout=$hout");
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//Return the calculated values
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if ($wout < 1 || $hout < 1)
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{
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return false;
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}
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else
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{
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return array($wout, $hout);
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}
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}
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/**
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* Read thumbnail from image, without loading it completly using optional exif extension
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*
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* @param string $file
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* @return boolean|resource false or a gd_image
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*/
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function exif_thumbnail_load($file)
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{
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if (!function_exists('exif_thumbnail') ||
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!($image = exif_thumbnail($file)))
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{
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return false;
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}
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return imagecreatefromstring($image);
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}
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/**
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* Loads the given imagefile - returns "false" if the file wasn't an image,
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* otherwise the gd-image is returned.
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*
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* @param string $file the file which to load
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* @returns boolean|resource false or a gd_image
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*/
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function gd_image_load($file)
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{
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// Get mime type
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list($type, $image_type) = explode('/', egw_vfs::mime_content_type($file));
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// Call the according gd constructor depending on the file type
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if($type == 'image')
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{
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if (in_array($image_type, array('tiff','jpeg')) && ($image = exif_thumbnail_load($file)))
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{
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return $image;
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}
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switch ($image_type)
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{
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case 'png':
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return imagecreatefrompng($file);
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case 'jpeg':
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return imagecreatefromjpeg($file);
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case 'gif':
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return imagecreatefromgif($file);
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case 'bmp':
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return imagecreatefromwbmp($file);
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}
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}
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else if ($type == 'application')
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{
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if(strpos($image_type,'vnd.oasis.opendocument.') === 0)
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{
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// OpenDocuments have thumbnails inside already
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return get_opendocument_thumbnail($file);
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}
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else if($image_type == 'pdf')
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{
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return get_pdf_thumbnail($file);
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}
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}
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return false;
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}
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/**
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* Extract the thumbnail from an opendocument file and apply a colored mask
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* so you can tell what type it is, and so it looks a little better in larger
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* thumbnails (eg: in tiled view)
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*
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* Inspired by thumbnails for nautilus:
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* http://bernaerts.dyndns.org/linux/76-gnome/285-gnome-shell-generate-libreoffice-thumbnail-nautilus
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*
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* @param string $file
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* @return resource GD image
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*/
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function get_opendocument_thumbnail($file)
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{
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list(, $file_type) = $mimetype = explode('/', egw_vfs::mime_content_type($file));
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// Image is already there, but we can't access them directly through VFS
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$ext = $mimetype == 'application/vnd.oasis.opendocument.text' ? '.odt' : '.ods';
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$archive = tempnam($GLOBALS['egw_info']['server']['temp_dir'], basename($file,$ext).'-');
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copy($file,$archive);
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$thumbnail_url = 'zip://'.$archive.'#Thumbnails/thumbnail.png';
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$image = imagecreatefromstring(file_get_contents($thumbnail_url));
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unlink($archive);
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// Mask it with a color by type
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$mask = imagecreatefrompng('templates/default/images/opendocument.png');
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if($image)
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{
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$filter_color = array(0,0,0);
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switch($file_type)
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{
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// Type colors from LibreOffice (https://wiki.documentfoundation.org/Design/Whiteboards/LibreOffice_Initial_Icons)
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case 'vnd.oasis.opendocument.text':
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$filter_color = array(2,63,98); break;
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case 'vnd.oasis.opendocument.spreadsheet':
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$filter_color = array(16,104,2); break;
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case 'vnd.oasis.opendocument.presentation':
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$filter_color = array(98,37,2); break;
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case 'vnd.oasis.opendocument.graphics':
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$filter_color = array(135,105,0); break;
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case 'vnd.oasis.opendocument.database':
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$filter_color = array(83,2,96); break;
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}
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imagefilter($mask, IMG_FILTER_COLORIZE, $filter_color[0],$filter_color[1],$filter_color[2] );
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imagecopyresampled($image, $mask,0,0,0,0,imagesx($image),imagesy($image),imagesx($mask),imagesy($mask));
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}
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return $image;
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}
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/**
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* Extract the thumbnail from a PDF file and apply a colored mask
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* so you can tell what type it is, and so it looks a little better in larger
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* thumbnails (eg: in tiled view).
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*
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* Requires ImageMagick & ghostscript.
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*
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* @param string $file
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* @return resource GD image
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*/
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function get_pdf_thumbnail($file)
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{
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if(!class_exists('Imagick')) return false;
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$im = new Imagick($file);
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$im->setimageformat('png');
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$im->setresolution(300, 300);
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$gd = imagecreatefromstring($im->getimageblob());
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//$mask = imagecreatefrompng('templates/default/images/mask_pdf.png');
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//imagecopyresampled($image, $mask,0,0,0,0,imagesx($mask),imagesy($mask),imagesx($mask),imagesy($mask));
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return $gd;
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}
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/**
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* Create an gd_image with transparent background.
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*
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* @param int $w the width of the resulting image
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* @param int $h the height of the resutling image
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*/
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function gd_create_transparent_image($w, $h)
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{
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if (!($gdVersion = gdVersion()))
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{
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//Looking up the gd version failed, return false
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return false;
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}
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elseif ($gdVersion >= 2)
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{
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//Create an 32-bit image and fill it with transparency.
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$img_dst = imagecreatetruecolor($w, $h);
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imageSaveAlpha($img_dst, true);
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$trans_color = imagecolorallocatealpha($img_dst, 0, 0, 0, 127);
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imagefill($img_dst, 0, 0, $trans_color);
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return $img_dst;
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}
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else
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{
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//Just crate a simple image
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return imagecreate($w, $h);
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}
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}
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/**
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* Creates a scaled version of the given image - returns the gd-image or false if the
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* process failed.
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*
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* @param string $file the filename of the file
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* @param int $maxw the maximum width of the thumbnail
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* @param int $maxh the maximum height of the thumbnail
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* @param int $minw the minimum width of the thumbnail
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* @param int $minh the minimum height of the thumbnail
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* @return the gd_image or false if one of the steps taken to produce the thumbnail
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* failed.
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*/
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function gd_image_thumbnail($file, $maxw, $maxh, $minw, $minh)
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{
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//Load the image
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if (($img_src = gd_image_load($file)) !== false)
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{
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//Get the constraints of the image
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$w = imagesx($img_src);
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$h = imagesy($img_src);
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//Calculate the actual size of the thumbnail
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$scaled = get_scaled_image_size($w, $h, $maxw, $maxh, $minw, $minh);
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if ($scaled !== false)
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{
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list($sw, $sh) = $scaled;
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//Now scale it down
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$img_dst = gd_create_transparent_image($sw, $sh);
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imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $sw, $sh, $w, $h);
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return $img_dst;
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}
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}
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return false;
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}
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/**
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* Get which version of GD is installed, if any.
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*
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* Returns the version (1 or 2) of the GD extension.
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* Off the php manual page, thanks Hagan Fox
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*/
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function gdVersion($user_ver = 0)
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{
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if (! extension_loaded('gd')) { return; }
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static $gd_ver = 0;
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// Just accept the specified setting if it's 1.
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if ($user_ver == 1) { $gd_ver = 1; return 1; }
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// Use the static variable if function was called previously.
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if ($user_ver !=2 && $gd_ver > 0 ) { return $gd_ver; }
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// Use the gd_info() function if possible.
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if (function_exists('gd_info')) {
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$ver_info = gd_info();
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$match = null;
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preg_match('/\d/', $ver_info['GD Version'], $match);
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$gd_ver = $match[0];
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return $match[0];
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}
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// If phpinfo() is disabled use a specified / fail-safe choice...
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if (preg_match('/phpinfo/', ini_get('disable_functions'))) {
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if ($user_ver == 2) {
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$gd_ver = 2;
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return 2;
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} else {
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$gd_ver = 1;
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return 1;
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}
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}
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// ...otherwise use phpinfo().
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ob_start();
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phpinfo(8);
|
|
$info = stristr(ob_get_clean(), 'gd version');
|
|
if (preg_match('/\d/', $info, $match)) $gd_ver = $match[0];
|
|
return $match[0];
|
|
}
|