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<?php
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/*
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Somewhat magic script that will push the server file to the client, taking
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into account client requests like ranges.
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This is a modified version of the original of charon-dl
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http://sf.net/projects/charon-dl
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*/
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/*
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Charon - Download System
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Copyright (C) 2005, Michiel "El Muerte" Hendriks
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* $Id: downloadhandler.php,v 1.3.2.7 2006/04/04 10:58:08 elmuerte Exp $ */
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define("READBUFFER_SIZE", 4096); // read buffer size
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define("USE_GZIP", true); // use GZip compression for text/* files
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define("WATERMARK", 1); // add a watermark to the image
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define("SUBSTITUTE", 2); // replace the image with an other one
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define("UPSAMPLE_PALLET", true); // if set upsample pallet images, produces better results
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define("DOWNSAMPLE_TO_ORIGIN", true); // if set to true downsample the watermarked
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// image to the original format, otherwise it will
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// be converted to a jpg
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/*
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not OS safe
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*/
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if (!function_exists("mime_content_type")) {
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function mime_content_type($f) {
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$f = escapeshellarg($f);
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return trim( exec("file -bi ".$f) );
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}
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}
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/**
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* Return true if the file is an image file.
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*
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* @param string the filename
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* @return boolean true if it's an image we want to process
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*/
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function __fr_is_image_file($filename) {
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// only png, jpg, gif are supported
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return (in_array(StrToLower(preg_replace("#^.*\.([^.]*)$#", "\\1", $filename)), array("jpg", "jpeg", "jpe", "png", "gif")));
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}
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/**
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* Reports the leech
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*/
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function __fr_report_leech() {
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global $__fr_reporting_leech;
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$__fr_reporting_leech = true;
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register_shutdown_function("__fr_delayed_report");
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}
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function __fr_delayed_report() {
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global $__fr_reporting_leech;
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if (!$__fr_reporting_leech) return;
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if (!function_exists('watchdog')) return;
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watchdog('download leech', "File: <i>".$_GET["file"]."</i><br />\nSource: <i>".$_SERVER["HTTP_REFERER"]."</i>", WATCHDOG_NOTICE);
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}
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/**
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* Detect leeching sites
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*
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* @param mixed array containing the configuration
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* @return bool false if it's a leech
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*/
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function __fr_can_download_file(&$config) {
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$config["watermark"] = false;
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if (!$config["filereq_antileech_enabled"]) return true;
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if (!empty($_SERVER["HTTP_REFERER"])) {
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if (!preg_match("#^http(s)?://".$config["filereq_antileech_regex"]."/#i", $_SERVER["HTTP_REFERER"])) {
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if (!isset($config["filereq_nowatchdog"])) __fr_report_leech();
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if (__fr_is_image_file($config["filename"])) {
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switch (intval($config["filereq_antileech_image_mode"])) {
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case WATERMARK:
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$config["watermark"] = __DRUPAL_BASE_DIR.$config["filereq_antileech_image_file"];
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return true;
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case SUBSTITUTE:
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$config["filename"] = __DRUPAL_BASE_DIR.$config["filereq_antileech_image_file"];
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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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// empty referer is good, for now
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return true;
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}
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/**
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* Send a file to the client. Absolute file path required!
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* @param bool forces the file to be send as an attachment (no inline viewing)
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* @param function is a function in the form: function($filename) and returns the mimetype
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* @return bool true if the download was handled
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*/
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function __fr_process_download($filename, $forcedl=false, $watermark=false, $mimeOverride=null)
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{
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global $__fr_reporting_leech;
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if (!file_exists($filename)) {
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trigger_error("Requested download file does not exist: <i>".$filename."</i>", E_USER_ERROR);
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return false;
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}
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if (!is_readable($filename)) {
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trigger_error("Requested file is not readable: <i>".$filename."</i>", E_USER_ERROR);
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return false;
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}
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$fi["path"] = $filename;
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$fi["name"] = basename($filename); // name reported to the browser
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$fi["size"] = filesize($filename);
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$fi["time"] = filemtime($filename);
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$fi["ranges"] = array();
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if ($forcedl) $contentDisposition = "attachment"; // inline/attachment
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else {
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//$_SERVER["HTTP_ACCEPT"];
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$contentDisposition = "inline"; // TODO: improve?
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}
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$do_watermark = false;
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if (file_exists($watermark) && __fr_is_image_file($fi["name"])) {
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$do_watermark = true;
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$fi["name"] = preg_replace("#^(.*)(\.[^.]*)$#", "\\1_branded\\2", $fi["name"]);
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}
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header("Content-Type: "); // unset content type
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if (!$do_watermark && isset($_SERVER["HTTP_RANGE"])) {
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// process ranges
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if (preg_match("/^bytes=(.*)$/", trim($_SERVER["HTTP_RANGE"]), $ranges)) {
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$ranges = explode(",", $ranges[1]);
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for ($i = 0; $i < count($ranges); $i++) {
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if (preg_match("/^([0-9]*)-([0-9]*)$/", $ranges[$i], $r)) {
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if ($r[1] == "") { // -X : last X bytes
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$fi["ranges"][] = array("start" => $fi["size"]-intval($r[2]), "stop" => $fi["size"]-1, "count" => intval($r[2]));
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}
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else if ($r[2] == "") { // X- : skip first X bytes
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$fi["ranges"][] = array("start" => intval($r[1]), "stop" => $fi["size"]-1, "count" => $fi["size"]-intval($r[1]));
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}
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else if ($r[1] == "" && $r[2] == "") {
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$fi["ranges"] = array();
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break;
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}
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else { // X-Y : X to Y bytes (0 = 1st byte)
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$fi["ranges"][] = array("start" => intval($r[1]), "stop" => intval($r[2]), "count" => intval($r[2])-intval($r[1])+1);
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}
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}
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else {
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$fi["ranges"] = array();
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break;
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}
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}
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}
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for ($i = 0; $i < count($fi["ranges"]); $i++) {
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if (($fi["ranges"][$i]["start"] < 0)
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|| ($fi["ranges"][$i]["stop"] >= $fi["size"])) {
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$fi["ranges"] = array();
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break;
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}
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}
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if (count($fi["ranges"]) == 0) { // no valid ranges specified
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header("HTTP/1.1 416 Requested range not satisfiable");
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header("Content-Range: bytes */".$fi["size"]);
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return true;
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}
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}
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if ($_SERVER["HTTP_IF_MODIFIED_SINCE"]) {
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if ($fi["time"] > strftime($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
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header("HTTP/1.1 304 Not Modified");
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$__fr_reporting_leech = false; // disable watchdog reporting
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return true;
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}
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}
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// figure out mime last
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$fi["mime"] = "";
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if (is_callable($mimeOverride)) $fi["mime"] = $mimeOverride(basename($filename));
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if (empty($fi["mime"])) {
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if (function_exists("mime_content_type")) $fi["mime"] = mime_content_type($filename);
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}
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if (!preg_match("#^(\w*)/(\w*)$#i", $fi["mime"])) $fi["mime"] = "application/octet-stream";
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// send headers
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if (count($fi["ranges"]) > 0) {
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header("HTTP/1.1 206 Partial content");
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if (count($fi["ranges"]) == 1) {
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header("Content-Range: bytes ".$fi["ranges"][0]["start"]."-".$fi["ranges"][0]["stop"]."/".$fi["size"]);
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header("Content-Length: ".$fi["ranges"][0]["count"]);
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}
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else {
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$byteRangeBoundary = "_BYTE_RANGE_".md5(microtime());
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header("Content-Type: multipart/byteranges; boundary=".$byteRangeBoundary);
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}
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}
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else {
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header("HTTP/1.1 200 Ok");
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if (!$do_watermark) header("Content-Length: ".$fi["size"]); // we don't know the final size when watermarking
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}
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if (!$do_watermark) header("Accept-Ranges: bytes");
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if (count($fi["ranges"]) <= 1) header("Content-Type: ".$fi["mime"]);
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/*if (!$do_watermark)*/ header("Last-Modified: ".gmdate("D, d M Y H:i:s \G\M\T", $fi["time"]));
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header("Content-Disposition: ".$contentDisposition."; filename=\"".$fi["name"]."\"");
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// encode text files when accepted
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if (USE_GZIP && preg_match("#^text/#i", $fi["mime"]) && extension_loaded("zlib")
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&& in_array("gzip", explode(",", $_SERVER["HTTP_ACCEPT_ENCODING"]))) {
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ob_start("ob_gzhandler");
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ob_implicit_flush(false); // content length header needs to be updated
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}
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if ($_SERVER["REQUEST_METHOD"] == "HEAD") return true; // no body for you
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if ($do_watermark) {
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header("Expires: ".gmdate("D, d M Y H:i:s \G\M\T", mktime()+900)); // expire watermark in 15 minutes
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header("X-Watermarked: true");
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return __fr_add_watermark($filename, $watermark);
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}
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$fp = fopen($filename, "rb");
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if (!$fp) {
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header("HTTP/1.1 500 Internal Server Error");
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echo "Unable to open file for reading.";
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return true;
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}
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if (count($fi["ranges"]) == 0) {
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while (!connection_status() && !feof($fp)) {
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echo fread($fp, READBUFFER_SIZE);
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}
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}
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else if (count($fi["ranges"]) == 1) {
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fseek($fp, $fi["ranges"][0]["start"], SEEK_SET);
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while (!connection_status() && (ftell($fp) <= $fi["ranges"][0]["stop"]-READBUFFER_SIZE)) {
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echo fread($fp, READBUFFER_SIZE);
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}
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if ($fi["ranges"][0]["stop"]-ftell($fp) > 1) echo fread($fp, $fi["ranges"][0]["stop"]-ftell($fp)+1);
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}
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else {
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for ($i = 0; $i < count($fi["ranges"]); $i++) {
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echo "\r\n";
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echo "--".$byteRangeBoundary."\r\n";
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echo "Content-Type: ".$fi["mime"]."\r\n";
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echo "Content-Range: bytes ".$fi["ranges"][$i]["start"]."-".$fi["ranges"][$i]["stop"]."/".$fi["size"]."\r\n";
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echo "Content-Disposition: ".$contentDisposition."; filename=".$fi["name"]."\r\n";
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echo "\r\n";
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fseek($fp, $fi["ranges"][$i]["start"], SEEK_SET);
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while (!connection_status() && (ftell($fp) <= $fi["ranges"][$i]["stop"]-READBUFFER_SIZE)) {
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echo fread($fp, READBUFFER_SIZE);
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}
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if ($fi["ranges"][$i]["stop"]-ftell($fp) > 1) echo fread($fp, $fi["ranges"][$i]["stop"]-ftell($fp)+1);
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}
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echo "\r\n";
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echo "--".$byteRangeBoundary."--";
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}
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fclose($fp);
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return true;
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}
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| 290 |
function __fr_imagetruecolortopalette_ex( $image, $dither, $ncolors )
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| 291 |
{
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if (function_exists('imagecolormatch')) {
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$width = imagesx( $image );
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$height = imagesy( $image );
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$colors_handle = ImageCreateTrueColor( $width, $height );
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ImageCopyMerge( $colors_handle, $image, 0, 0, 0, 0, $width, $height, 100 );
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}
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ImageTrueColorToPalette( $image, $dither, $ncolors );
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if (function_exists('imagecolormatch')) {
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| 300 |
ImageColorMatch( $colors_handle, $image );
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| 301 |
ImageDestroy( $colors_handle );
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}
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| 303 |
}
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/*
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Source of this routine:
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http://www.php.net/manual/en/function.imagecopymerge.php
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slightly modified
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*/
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function __fr_add_watermark($sourcefile, $watermarkfile) {
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#
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# $sourcefile = Filename of the picture to be watermarked.
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# $watermarkfile = Filename of the 24-bit PNG watermark file.
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| 316 |
#
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| 317 |
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//Get the resource ids of the pictures
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| 319 |
$watermarkfile_id = imagecreatefrompng($watermarkfile);
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imageAlphaBlending($watermarkfile_id, false);
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imageSaveAlpha($watermarkfile_id, true);
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| 323 |
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| 324 |
$fileType = getimagesize($sourcefile);
|
| 325 |
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| 326 |
switch($fileType[2]) {
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| 327 |
case 1:
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| 328 |
$sourcefile_id = imagecreatefromgif($sourcefile);
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| 329 |
break;
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| 331 |
case 2:
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| 332 |
$sourcefile_id = imagecreatefromjpeg($sourcefile);
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| 333 |
break;
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| 334 |
|
| 335 |
case 3:
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| 336 |
$sourcefile_id = imagecreatefrompng($sourcefile);
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| 337 |
break;
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| 338 |
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| 339 |
}
|
| 340 |
|
| 341 |
//Get the sizes of both pix
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| 342 |
$sourcefile_width=imageSX($sourcefile_id);
|
| 343 |
$sourcefile_height=imageSY($sourcefile_id);
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| 344 |
$watermarkfile_width=imageSX($watermarkfile_id);
|
| 345 |
$watermarkfile_height=imageSY($watermarkfile_id);
|
| 346 |
|
| 347 |
$dest_x = ( $sourcefile_width / 2 ) - ( $watermarkfile_width / 2 );
|
| 348 |
$dest_y = ( $sourcefile_height / 2 ) - ( $watermarkfile_height / 2 );
|
| 349 |
|
| 350 |
$upsampled = 0;
|
| 351 |
|
| 352 |
// if a gif, we have to upsample it to a truecolor image
|
| 353 |
if(UPSAMPLE_PALLET && !imageistruecolor($sourcefile_id)) {
|
| 354 |
// create an empty truecolor container
|
| 355 |
$tempimage = imagecreatetruecolor($sourcefile_width, $sourcefile_height);
|
| 356 |
|
| 357 |
$upsampled = imagecolorstotal($sourcefile_id);
|
| 358 |
|
| 359 |
// copy the 8-bit gif into the truecolor image
|
| 360 |
imagecopy($tempimage, $sourcefile_id, 0, 0, 0, 0, $sourcefile_width, $sourcefile_height);
|
| 361 |
imagedestroy($sourcefile_id);
|
| 362 |
|
| 363 |
// copy the source_id int
|
| 364 |
$sourcefile_id = $tempimage;
|
| 365 |
}
|
| 366 |
|
| 367 |
imagecopy($sourcefile_id, $watermarkfile_id, $dest_x, $dest_y, 0, 0, $watermarkfile_width, $watermarkfile_height);
|
| 368 |
|
| 369 |
if ($upsampled) {
|
| 370 |
if (DOWNSAMPLE_TO_ORIGIN && function_exists('imagetruecolortopalette')) {
|
| 371 |
__fr_imagetruecolortopalette_ex($sourcefile_id, true, 256);
|
| 372 |
}
|
| 373 |
else {
|
| 374 |
$fileType[2] = 2; // force to JPEG to reduce size
|
| 375 |
}
|
| 376 |
}
|
| 377 |
|
| 378 |
//Create a jpeg out of the modified picture
|
| 379 |
switch($fileType[2]) {
|
| 380 |
|
| 381 |
// remember we don't need gif any more, so we use only png or jpeg.
|
| 382 |
// See the upsaple code immediately above to see how we handle gifs
|
| 383 |
case 3:
|
| 384 |
header("Content-type: image/png");
|
| 385 |
imagepng ($sourcefile_id);
|
| 386 |
break;
|
| 387 |
|
| 388 |
case 1:
|
| 389 |
if (imagetypes() & IMG_GIF) {
|
| 390 |
header("Content-type: image/gif");
|
| 391 |
imagegif ($sourcefile_id);
|
| 392 |
break;
|
| 393 |
}
|
| 394 |
|
| 395 |
default:
|
| 396 |
header("Content-type: image/jpg");
|
| 397 |
imagejpeg ($sourcefile_id);
|
| 398 |
}
|
| 399 |
|
| 400 |
imagedestroy($sourcefile_id);
|
| 401 |
imagedestroy($watermarkfile_id);
|
| 402 |
}
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