mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-12-04 22:01:05 +01:00
372 lines
9.0 KiB
PHP
372 lines
9.0 KiB
PHP
<?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];
|
|
}
|