[Php-avanzado] Script para bajar un archivo
Mario Gomez Cassou
collectgc en gmail.com
Sab Dic 5 16:39:06 ART 2015
Hola gente:
en un sistema genero un archivo al que el usuario debe poder bajar a su
compu ("datos.csv")
Para esto utilizo un script que baje de
http://www.media-division.com/php-download-script-with-resume-option
Esta muy piola: pego el contenido debajo del mensaje
El script se llama "bajar.php" y lo llamo con
<a href="bajar.php?file=bajar/datos.csv" class = "boton2">Bajar el
archivo</a>
El problema es que funciona perfecto en mi compu y en un sitio, pero en
otro, en lugar de inciar la descarga al tocar el link pone la pantalla en
blanco y ahi queda.
Hoy estuve nuevamente mirando el codigo y no me doy cuenta donde esta el
problema.
Lo gracioso es que para seguir adelante en mi página le puse directamente
un link al archivo y al tocarlo el navegador inicia la descarga...
Como sea, si a algún Leo se le ocurre que cambiar se agradece el comentario
Gracias
Mario
(bajar.php)
------------------------------------------------------------------------------------------
/**
* Copyright 2012 Armand Niculescu - media-division.com
* Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT "AS IS" AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
*/
// get the file request, throw error if nothing supplied
// hide notices
@ini_set('error_reporting', E_ALL);
//- turn off compression on the server
@apache_setenv('no-gzip', 1);
@ini_set('zlib.output_compression', 'Off');
if(!isset($_REQUEST['file']) || empty($_REQUEST['file']))
{
header("HTTP/1.0 400 Bad Request");
exit;
}
// sanitize the file request, keep just the name and extension
// also, replaces the file location with a preset one ('./myfiles/' in this
example)
$file_path = $_REQUEST['file'];
$path_parts = pathinfo($file_path);
$file_name = $path_parts['basename'];
$file_ext = $path_parts['extension'];
$file_path = './bajar/' . $file_name;
// allow a file to be streamed instead of sent as an attachment
$is_attachment = isset($_REQUEST['stream']) ? false : true;
// make sure the file exists
if (is_file($file_path))
{
$file_size = filesize($file_path);
$file = @fopen($file_path,"rb");
if ($file)
{
// set the headers, prevent caching
header("Pragma: public");
header("Expires: -1");
header("Cache-Control: public, must-revalidate, post-check=0,
pre-check=0");
header("Content-Disposition: attachment; filename=\"$file_name\"");
// set appropriate headers for attachment or streamed file
if ($is_attachment)
header("Content-Disposition: attachment;
filename=\"$file_name\"");
else
header('Content-Disposition: inline;');
// set the mime type based on extension, add yours if needed.
$ctype_default = "application/octet-stream";
$content_types = array(
"exe" => "application/octet-stream",
"zip" => "application/zip",
"mp3" => "audio/mpeg",
"mpg" => "video/mpeg",
"avi" => "video/x-msvideo",
);
$ctype = isset($content_types[$file_ext]) ?
$content_types[$file_ext] : $ctype_default;
header("Content-Type: " . $ctype);
//check if http_range is sent by browser (or download manager)
if(isset($_SERVER['HTTP_RANGE']))
{
list($size_unit, $range_orig) = explode('=',
$_SERVER['HTTP_RANGE'], 2);
if ($size_unit == 'bytes')
{
//multiple ranges could be specified at the same time, but
for simplicity only serve the first range
//
http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt
list($range, $extra_ranges) = explode(',', $range_orig, 2);
}
else
{
$range = '';
header('HTTP/1.1 416 Requested Range Not Satisfiable');
exit;
}
}
else
{
$range = '';
}
//figure out download piece from range (if set)
list($seek_start, $seek_end) = explode('-', $range, 2);
//set start and end based on range (if set), else set defaults
//also check for invalid ranges.
$seek_end = (empty($seek_end)) ? ($file_size - 1) :
min(abs(intval($seek_end)),($file_size - 1));
$seek_start = (empty($seek_start) || $seek_end <
abs(intval($seek_start))) ? 0 : max(abs(intval($seek_start)),0);
//Only send partial content header if downloading a piece of the
file (IE workaround)
if ($seek_start > 0 || $seek_end < ($file_size - 1))
{
header('HTTP/1.1 206 Partial Content');
header('Content-Range: bytes
'.$seek_start.'-'.$seek_end.'/'.$file_size);
header('Content-Length: '.($seek_end - $seek_start + 1));
}
else
header("Content-Length: $file_size");
header('Accept-Ranges: bytes');
set_time_limit(0);
fseek($file, $seek_start);
while(!feof($file))
{
print(@fread($file, 1024*8));
ob_flush();
flush();
if (connection_status()!=0)
{
@fclose($file);
exit;
}
}
// file save was a success
@fclose($file);
exit;
}
else
{
// file couldn't be opened
header("HTTP/1.0 500 Internal Server Error");
exit;
}
}
else
{
// file does not exist
header("HTTP/1.0 404 Not Found");
exit;
}
?>
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