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mediafirewall.php
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mediafirewall.php
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<?php
/**
* Media Firewall
* Called when a 404 error occurs in the media directory
* Serves images from the index directory
*
* phpGedView: Genealogy Viewer
* Copyright (C) 2002 to 2009 PGV Development Team. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* @package PhpGedView
* @version $Id$
*/
require './config.php';
require_once("includes/controllers/media_ctrl.php");
// We have finished writing to $_SESSION, so release the lock
session_write_close();
$controller = new MediaController();
$controller->init();
$debug_mediafirewall = 0; // set to 1 if you want to see media firewall values displayed instead of images
$debug_watermark = 0; // set to 1 if you want to see error messages from the watermark module instead of broken images
$debug_forceImageRegen = 0; // set to 1 if you want to force an image to be regenerated (for debugging only)
$debug_verboseLogging = 0; // set to 1 for extra logging details
// pass in an image type and an error message
// if the image type is supported:
// creates an image, adds the text, sends headers, outputs the image and exits the script
// if the image type is not supported:
// sends html version of error message and exits the script
// basic idea from http://us.php.net/manual/en/function.imagecreatefromjpeg.php
// type - file extension: JPG, GIF, PNG
// line1 - the error message
// line2 - the media file which caused the error (shown only to admins/editors)
function sendErrorAndExit($type, $line1, $line2 = false) {
// line2 contains the information that only an admin/editor should see, such as the full path to a file
if(!PGV_USER_CAN_EDIT) {
$line2 = false;
}
// arbitrary maxlen to keep images from getting too wide
$maxlen = 100;
$numchars = UTF8_strlen($line1);
if ($numchars > $maxlen) {
$line1 = UTF8_substr($line1, $maxlen);
$numchars = $maxlen;
}
$line1 = reverseText($line1);
if ($line2) {
$numchars2 = UTF8_strlen($line2);
if ($numchars2 > $maxlen) {
$line2 = UTF8_substr($line2, $maxlen);
$numchars2 = $maxlen;
}
if ($numchars2 > $numchars) {
$numchars = $numchars2;
}
$line2 = reverseText($line2);
}
$type = isImageTypeSupported($type);
if ( $type ){
// width of image is based on the number of characters
$width = ($numchars+1) * 6.5;
$height = 60;
$im = imagecreatetruecolor($width, $height); /* Create a black image */
$bgc = imagecolorallocate($im, 255, 255, 255); /* set background color */
$tc = imagecolorallocate($im, 0, 0, 0); /* set text color */
imagefilledrectangle($im, 2, 2, $width-4, $height-4, $bgc); /* create a rectangle, leaving 2 px border */
imagestring($im, 2, 5, 5, $line1, $tc);
if ($line2) {
imagestring($im, 2, 5, 30, $line2, $tc);
}
// if we are using mod rewrite, there will be no error status. be sure to set it
header('HTTP/1.0 404 Not Found');
header('Status: 404 Not Found');
header('Content-Type: image/'.$type);
$imSendFunc = 'image'.$type;
$imSendFunc($im);
imagedestroy($im);
} else {
// output a standard html string
// if we are using mod rewrite, there will be no error status. be sure to set it
header('HTTP/1.0 404 Not Found');
header('Status: 404 Not Found');
echo "<html><body>\n";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "<!-- filler space so IE will display the custom 404 error -->";
echo "\n<div align=\"center\">".$line1."</div>\n";
if ($line2) {
// line2 comes from url, wrap in PrintReady
echo "<div align=\"center\">".PrintReady($line2)."</div>\n";
}
echo "</body></html>\n";
}
exit;
}
// pass in the complete serverpath to an image
// this returns the complete serverpath to be used by the saved watermarked image
// note that each gedcom gets a unique path to store images, this allows each gedcom to have their own watermarking config
function getWatermarkPath ($path) {
global $MEDIA_DIRECTORY;
$serverroot = get_media_firewall_path($MEDIA_DIRECTORY);
$path = str_replace($serverroot, $serverroot . 'watermark/'.PGV_GEDCOM.'/', $path);
return $path;
}
// the media firewall passes in an image
// this function can manipulate the image however it wants
// before returning it back to the media firewall
function applyWatermark($im) {
// in the future these options will be set in the gedcom configuration area
// text to watermark with
$word1_text = get_gedcom_setting(PGV_GED_ID, 'title');
// maximum font size for "word1" ; will be automaticaly reduced to fit in the image
$word1_maxsize = 100;
// rgb color codes for text
$word1_color = "0, 0, 0";
// ttf font file to use. must exist in the includes/fonts/ directory
$word1_font = "";
// vertical position for the text to past; possible values are: top, middle or bottom, across
$word1_vpos = "across";
// horizontal position for the text to past in media file; possible values are: left, right, top2bottom, bottom2top
// this value is used only if $word1_vpos=across
$word1_hpos = "left";
$word2_text = $_SERVER["HTTP_HOST"];
$word2_maxsize = 20;
$word2_color = "0, 0, 0";
$word2_font = "";
$word2_vpos = "top";
$word2_hpos = "top2bottom";
embedText($im, $word1_text, $word1_maxsize, $word1_color, $word1_font, $word1_vpos, $word1_hpos);
embedText($im, $word2_text, $word2_maxsize, $word2_color, $word2_font, $word2_vpos, $word2_hpos);
return ($im);
}
function embedText($im, $text, $maxsize, $color, $font, $vpos, $hpos) {
global $useTTF;
// there are two ways to embed text with PHP
// (preferred) using GD and FreeType you can embed text using any True Type font
// (fall back) if that is not available, you can insert basic monospaced text
if ($useTTF) {
// imagettftext is available, make sure the requested font exists
if (!isset($font)||($font=='')||!file_exists('includes/fonts/'.$font)) {
$font = 'DejaVuSans.ttf'; // this font ships with PGV
if (!file_exists('includes/fonts/'.$font)) {
$useTTF = false;
}
}
}
# no errors if an invalid color string was passed in, just strange colors
$col=explode(",", $color);
$textcolor = @imagecolorallocate($im, $col[0],$col[1],$col[2]);
// paranoia is good! make sure all variables have a value
if (!isset($vpos) || ($vpos!="top" && $vpos!="middle" && $vpos!="bottom" && $vpos!="across")) $vpos = "middle";
if (($vpos=="across") && (!isset($hpos) || ($hpos!="left" && $hpos!="right" && $hpos!="top2bottom" && $hpos!="bottom2top"))) $hpos = "left";
// make adjustments to settings that imagestring and imagestringup can't handle
if (!$useTTF) {
// imagestringup only writes up, can't use top2bottom
if ($hpos=="top2bottom") $hpos = "bottom2top";
}
$text = reverseText(stripslashes($text));
$height = imagesy($im);
$width = imagesx($im);
$calc_angle=rad2deg(atan($height/$width));
$hypoth=$height/sin(deg2rad($calc_angle));
// vertical and horizontal position of the text
switch ($vpos) {
case "top":
$taille=textlength($maxsize,$width,$text);
$pos_y=$height*0.15+$taille;
$pos_x=$width*0.15;
$rotation=0;
break;
case "middle":
$taille=textlength($maxsize,$width,$text);
$pos_y=($height+$taille)/2;
$pos_x=$width*0.15;
$rotation=0;
break;
case "bottom":
$taille=textlength($maxsize,$width,$text);
$pos_y=($height*.85-$taille);
$pos_x=$width*0.15;
$rotation=0;
break;
case "across":
switch ($hpos) {
case "left":
$taille=textlength($maxsize,$hypoth,$text);
$pos_y=($height*.85-$taille);
$taille_text=($taille-2)*(UTF8_strlen($text));
$pos_x=$width*0.15;
$rotation=$calc_angle;
break;
case "right":
$taille=textlength($maxsize,$hypoth,$text);
$pos_y=($height*.15-$taille);
$pos_x=$width*0.85;
$rotation=$calc_angle+180;
break;
case "top2bottom":
$taille=textlength($maxsize,$height,$text);
$pos_y=($height*.15-$taille);
$pos_x=($width*.90-$taille);
$rotation=-90;
break;
case "bottom2top":
$taille=textlength($maxsize,$height,$text);
$pos_y = $height*0.85;
$pos_x = $width*0.15;
$rotation=90;
break;
}
break;
default:
}
// apply the text
if ($useTTF) {
// if imagettftext throws errors, catch them with a custom error handler
set_error_handler("imagettftextErrorHandler");
imagettftext($im, $taille, $rotation, $pos_x, $pos_y, $textcolor, 'includes/fonts/'.$font, $text);
restore_error_handler();
}
// don't use an 'else' here since imagettftextErrorHandler may have changed the value of $useTTF from true to false
if (!$useTTF) {
if ($rotation!=90) {
imagestring($im, 5, $pos_x, $pos_y, $text,$textcolor);
} else {
imagestringup($im, 5, $pos_x, $pos_y, $text,$textcolor);
}
}
}
function textlength($t,$mxl,$text) {
$taille_c = $t;
$len = UTF8_strlen($text);
while (($taille_c-2)*($len) > $mxl) {
$taille_c--;
if ($taille_c == 2) break;
}
return ($taille_c);
}
// imagettftext is the function that is most likely to throw an error
// use this custom error handler to catch and log it
function imagettftextErrorHandler($errno, $errstr, $errfile, $errline) {
global $useTTF, $serverFilename;
// log the error
AddToLog("Media Firewall error: >".$errstr."< in file >".$serverFilename."< (".getImageInfoForLog($serverFilename).")" );
// change value of useTTF to false so the fallback watermarking can be used.
$useTTF = false;
return true;
}
// ******************************************************
// start processing here
// to allow watermarking of large images, attempt to disable or raise memory limits
// @ini_set("memory_limit", "-1");
// @ini_set("memory_limit", "64M");
// this needs to be a global variable so imagettftextErrorHandler can set it
$useTTF = (function_exists("imagettftext")) ? true : false;
// get serverfilename from the media controller
$serverFilename = $controller->getServerFilename();
if (!$serverFilename) {
// either the server is not setting the REQUEST_URI variable as we expect,
// or the media firewall is being used from outside the media directory
$requestedfile = ( isset($_SERVER['REQUEST_URI']) ) ? $_SERVER['REQUEST_URI'] : "REQUEST_URI NOT SET";
$exp = explode("?", $requestedfile);
$pathinfo = pathinfo($exp[0]);
$ext = @strtolower($pathinfo['extension']);
if (!$debug_mediafirewall) sendErrorAndExit($ext, $pgv_lang["media_firewall_invalid_dir"], $requestedfile);
}
$isThumb = false;
if (strpos($_SERVER['REQUEST_URI'], '/thumbs/')) {
// the user requested a thumbnail, but the $controller only knows how to lookup information on the main file
// display the thumbnail file instead of the main file
// NOTE: since this script was called when a 404 error occured, we know the requested file
// does not exist in the main media directory. just check the media firewall directory
$serverFilename = get_media_firewall_path($controller->mediaobject->getThumbnail(false));
$isThumb = true;
}
if (!file_exists($serverFilename)) {
// the requested file MAY be in the gedcom, but it does NOT exist on the server. bail.
// Note: the 404 error status is still in effect.
if (!$debug_mediafirewall) sendErrorAndExit($controller->mediaobject->getFiletype(), $pgv_lang["no_media"], $serverFilename);
}
if (empty($controller->pid)) {
// the requested file IS NOT in the gedcom, but it exists (the check for fileExists was above)
if (!PGV_USER_IS_ADMIN) {
// only show these files to admin users
// bail since current user is not admin
// Note: the 404 error status is still in effect.
// if (!$debug_mediafirewall) sendErrorAndExit($controller->mediaobject->getFiletype(), $pgv_lang["media_privacy"], $serverFilename);
}
}
// check PGV permissions
if (!$controller->mediaobject->canDisplayDetails()) {
// if no permissions, bail
// Note: the 404 error status is still in effect
if (!$debug_mediafirewall) sendErrorAndExit($controller->mediaobject->getFiletype(), $pgv_lang["media_privacy"]);
}
$protocol = $_SERVER["SERVER_PROTOCOL"]; // determine if we are using HTTP/1.0 or HTTP/1.1
$filetime = @filemtime($serverFilename);
$filetimeHeader = gmdate("D, d M Y H:i:s", $filetime).' GMT';
$expireOffset = 3600 * 24; // tell browser to cache this image for 24 hours
$expireHeader = gmdate("D, d M Y H:i:s", time() + $expireOffset) . " GMT";
$type = isImageTypeSupported($controller->mediaobject->getFiletype());
$usewatermark = false;
// if this image supports watermarks and the watermark module is intalled...
if ($type && function_exists("applyWatermark")) {
// if this is not a thumbnail, or WATERMARK_THUMB is true
if (!$isThumb || $WATERMARK_THUMB ) {
// if the user's priv's justify it...
if (PGV_USER_ACCESS_LEVEL > $SHOW_NO_WATERMARK ) {
// add a watermark
$usewatermark = true;
}
}
}
// determine whether we have enough memory to watermark this image
if ($usewatermark) {
if (!hasMemoryForImage($serverFilename, $debug_verboseLogging)) {
// not enough memory to watermark this file
$usewatermark = false;
}
}
$watermarkfile = "";
$generatewatermark = false;
if ($usewatermark) {
$watermarkfile = getWatermarkPath($serverFilename);
if (!file_exists($watermarkfile) || $debug_forceImageRegen) {
// no saved watermark file exists
// generate the watermark file
$generatewatermark = true;
} else {
$watermarktime = filemtime($watermarkfile);
if ($filetime > $watermarktime) {
// if the original image was updated after the saved file was created
// generate the watermark file
$generatewatermark = true;
}
}
}
$mimetype = $controller->mediaobject->getMimetype();
// setup the etag. use enough info so that if anything important changes, the etag won't match
$etag_string = basename($serverFilename).$filetime.PGV_USER_ACCESS_LEVEL.$SHOW_NO_WATERMARK;
$etag = dechex(crc32($etag_string));
// parse IF_MODIFIED_SINCE header from client
$if_modified_since = 'x';
if (@$_SERVER["HTTP_IF_MODIFIED_SINCE"]) {
$if_modified_since = preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]);
}
// parse IF_NONE_MATCH header from client
$if_none_match = 'x';
if (@$_SERVER["HTTP_IF_NONE_MATCH"]) {
$if_none_match = str_replace('\"', '', $_SERVER["HTTP_IF_NONE_MATCH"]);
}
if ($debug_mediafirewall) {
// this is for debugging the media firewall
header("Last-Modified: " . $filetimeHeader);
header('ETag: "'.$etag.'"');
echo '<table border="1">';
echo '<tr><td>GEDCOM</td><td>'.PGV_GEDCOM.'</td><td> </td></tr>';
echo '<tr><td>MEDIA_DIRECTORY_LEVELS</td><td>'.$MEDIA_DIRECTORY_LEVELS.'</td><td> </td></tr>';
echo '<tr><td>$controller->pid</td><td>'.$controller->pid.'</td><td> </td></tr>';
echo '<tr><td>Requested URL</td><td>'.urldecode($_SERVER['REQUEST_URI']).'</td><td> </td></tr>';
echo '<tr><td>serverFilename</td><td>'.$serverFilename.'</td><td> </td></tr>';
echo '<tr><td>controller->mediaobject->getFilename()</td><td>'.$controller->mediaobject->getFilename().'</td><td>this is direct from the gedcom</td></tr>';
echo '<tr><td>controller->mediaobject->getServerFilename()</td><td>'.$controller->mediaobject->getServerFilename().'</td><td></td></tr>';
echo '<tr><td>controller->mediaobject->fileExists()</td><td>'.$controller->mediaobject->fileExists().'</td><td></td></tr>';
echo '<tr><td>controller->mediaobject->getFiletype()</td><td>'.$controller->mediaobject->getFiletype().'</td><td> </td></tr>';
echo '<tr><td>mimetype</td><td>'.$mimetype.'</td><td> </td></tr>';
echo '<tr><td>controller->mediaobject->getFilesize()</td><td>'.$controller->mediaobject->getFilesize().'</td><td>cannot use this</td></tr>';
echo '<tr><td>filesize</td><td>'.@filesize($serverFilename).'</td><td>this is right</td></tr>';
echo '<tr><td>controller->mediaobject->getThumbnail()</td><td>'.$controller->mediaobject->getThumbnail().'</td><td> </td></tr>';
echo '<tr><td>controller->mediaobject->canDisplayDetails()</td><td>'.$controller->mediaobject->canDisplayDetails().'</td><td> </td></tr>';
echo '<tr><td>controller->mediaobject->getFullName()</td><td>'.$controller->mediaobject->getFullName().'</td><td> </td></tr>';
echo '<tr><td>basename($serverFilename)</td><td>'.basename($serverFilename).'</td><td> </td></tr>';
echo '<tr><td>filetime</td><td>'.$filetime.'</td><td> </td></tr>';
echo '<tr><td>filetimeHeader</td><td>'.$filetimeHeader.'</td><td> </td></tr>';
echo '<tr><td>if_modified_since</td><td>'.$if_modified_since.'</td><td> </td></tr>';
echo '<tr><td>if_none_match</td><td>'.$if_none_match.'</td><td> </td></tr>';
echo '<tr><td>etag</td><td>'.$etag.'</td><td> </td></tr>';
echo '<tr><td>etag_string</td><td>'.$etag_string.'</td><td> </td></tr>';
echo '<tr><td>expireHeader</td><td>'.$expireHeader.'</td><td> </td></tr>';
echo '<tr><td>protocol</td><td>'.$protocol.'</td><td> </td></tr>';
echo '<tr><td>SHOW_NO_WATERMARK</td><td>'.$SHOW_NO_WATERMARK.'</td><td> </td></tr>';
echo '<tr><td>PGV_USER_ACCESS_LEVEL</td><td>'.PGV_USER_ACCESS_LEVEL.'</td><td> </td></tr>';
echo '<tr><td>usewatermark</td><td>'.$usewatermark.'</td><td> </td></tr>';
echo '<tr><td>generatewatermark</td><td>'.$generatewatermark.'</td><td> </td></tr>';
echo '<tr><td>watermarkfile</td><td>'.$watermarkfile.'</td><td> </td></tr>';
echo '<tr><td>type</td><td>'.$type.'</td><td> </td></tr>';
echo '<tr><td>WATERMARK_THUMB</td><td>'.$WATERMARK_THUMB.'</td><td> </td></tr>';
echo '<tr><td>SAVE_WATERMARK_THUMB</td><td>'.$SAVE_WATERMARK_THUMB.'</td><td> </td></tr>';
echo '<tr><td>SAVE_WATERMARK_IMAGE</td><td>'.$SAVE_WATERMARK_IMAGE.'</td><td> </td></tr>';
echo '</table>';
echo '<pre>';
print_r (@getimagesize($serverFilename));
print_r ($controller->mediaobject);
print_r (PGV_GEDCOM);
echo '</pre>';
phpinfo();
exit;
}
// do the real work here
// add caching headers. allow browser to cache file, but not proxy
if (!$debug_forceImageRegen) {
header("Last-Modified: " . $filetimeHeader);
header('ETag: "'.$etag.'"');
header("Expires: ".$expireHeader);
header("Cache-Control: max-age=".$expireOffset.", s-maxage=0, proxy-revalidate");
}
// if this file is already in the user's cache, don't resend it
// first check if the if_modified_since param matches
if (($if_modified_since == $filetimeHeader) && !$debug_forceImageRegen) {
// then check if the etag matches
if ($if_none_match == $etag) {
header($protocol." 304 Not Modified");
exit;
}
}
// reset the 404 error
header($protocol." 200 OK");
header("Status: 200 OK");
// send headers for the image
if (!$debug_watermark) {
header("Content-Type: " . $mimetype);
header('Content-Disposition: inline; filename="'.basename($serverFilename).'"');
}
if ( $generatewatermark ) {
// generate the watermarked image
$imCreateFunc = 'imagecreatefrom'.$type;
$im = @$imCreateFunc($serverFilename);
if ($im) {
if ($debug_verboseLogging) AddToLog("Media Firewall log: >about to watermark< file >".$serverFilename."< (".getImageInfoForLog($serverFilename).") memory used: ".memory_get_usage());
$im = applyWatermark($im);
if ($debug_verboseLogging) AddToLog("Media Firewall log: >watermark complete< file >".$serverFilename."< (".getImageInfoForLog($serverFilename).") memory used: ".memory_get_usage());
$imSendFunc = 'image'.$type;
// save the image, if preferences allow
if ( ($isThumb && $SAVE_WATERMARK_THUMB) || (!$isThumb && $SAVE_WATERMARK_IMAGE) ) {
// make sure the directory exists
if (!is_dir(dirname($watermarkfile))) {
mkdirs(dirname($watermarkfile));
}
// save the image
$imSendFunc($im, $watermarkfile);
}
// send the image
$imSendFunc($im);
imagedestroy($im);
if ($debug_verboseLogging) AddToLog("Media Firewall log: >done with < file >".$serverFilename."< (".getImageInfoForLog($serverFilename).") memory used: ".memory_get_usage());
exit;
} else {
// this image is defective. log it
AddToLog("Media Firewall error: >".$pgv_lang["media_broken"]."< in file >".$serverFilename."< (".getImageInfoForLog($serverFilename).") memory used: ".memory_get_usage());
// set usewatermark to false so image will simply be passed through below
$usewatermark = false;
}
}
// pass the image through without manipulating it
if ( $usewatermark ) {
// the stored watermarked image is good, lets use it
$serverFilename = $watermarkfile;
}
// determine filesize of image (could be original or watermarked version)
$filesize = filesize($serverFilename);
// set one more header
header("Content-Length: " . $filesize);
// open the file and send it
$fp = fopen($serverFilename, 'rb');
fpassthru($fp);
exit;
?>