138 lines
3.7 KiB
PHP
138 lines
3.7 KiB
PHP
<?php
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namespace Zotlabs\Module;
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/**
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* module: getfile
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*
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* used for synchronising files and photos across clones
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*
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* The site initiating the file operation will send a sync packet to known clones.
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* They will respond by building the DB structures they require, then will provide a
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* post request to this site to grab the file data. This is sent as a stream direct to
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* disk at the other end, avoiding memory issues.
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*
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* Since magic-auth cannot easily be used by the CURL process at the other end,
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* we will require a signed request which includes a timestamp. This should not be
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* used without SSL and is potentially vulnerable to replay if an attacker decrypts
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* the SSL traffic fast enough. The amount of time slop is configurable but defaults
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* to 3 minutes.
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*
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*/
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require_once('include/attach.php');
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class Getfile extends \Zotlabs\Web\Controller {
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function post() {
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logger('post: ' . print_r($_POST,true),LOGGER_DEBUG,LOG_INFO);
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$hash = $_POST['hash'];
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$time = $_POST['time'];
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$sig = $_POST['signature'];
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$resource = $_POST['resource'];
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$revision = intval($_POST['revision']);
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$resolution = (-1);
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if(! $hash)
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killme();
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$channel = channelx_by_hash($hash);
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if((! $channel) || (! $time) || (! $sig)) {
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logger('error: missing info');
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killme();
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}
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if(substr($resource,-2,1) == '-') {
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$resolution = intval(substr($resource,-1,1));
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$resource = substr($resource,0,-2);
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}
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$slop = intval(get_pconfig($channel['channel_id'],'system','getfile_time_slop'));
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if($slop < 1)
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$slop = 3;
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$d1 = datetime_convert('UTC','UTC',"now + $slop minutes");
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$d2 = datetime_convert('UTC','UTC',"now - $slop minutes");
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if(($time > $d1) || ($time < $d2)) {
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logger('time outside allowable range');
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killme();
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}
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if(! rsa_verify($hash . '.' . $time,base64url_decode($sig),$channel['channel_pubkey'])) {
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logger('verify failed.');
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killme();
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}
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if($resolution > 0) {
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$r = q("select * from photo where resource_id = '%s' and uid = %d limit 1",
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dbesc($resource),
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intval($channel['channel_id'])
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);
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if($r) {
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header('Content-type: ' . $r[0]['mimetype']);
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if(intval($r[0]['os_storage'])) {
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$fname = dbunescbin($r[0]['content']);
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if(strpos($fname,'store') !== false)
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$istream = fopen($fname,'rb');
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else
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$istream = fopen('store/' . $channel['channel_address'] . '/' . $fname,'rb');
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$ostream = fopen('php://output','wb');
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if($istream && $ostream) {
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pipe_streams($istream,$ostream);
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fclose($istream);
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fclose($ostream);
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}
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}
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else {
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echo dbunescbin($r[0]['content']);
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}
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}
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killme();
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}
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$r = attach_by_hash($resource,$channel['channel_hash'],$revision);
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if(! $r['success']) {
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logger('attach_by_hash failed: ' . $r['message']);
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notice( $r['message'] . EOL);
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return;
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}
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$unsafe_types = array('text/html','text/css','application/javascript');
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if(in_array($r['data']['filetype'],$unsafe_types) && (! channel_codeallowed($channel['channel_id']))) {
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header('Content-type: text/plain');
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}
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else {
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header('Content-type: ' . $r['data']['filetype']);
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}
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header('Content-disposition: attachment; filename="' . $r['data']['filename'] . '"');
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if(intval($r['data']['os_storage'])) {
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$fname = dbunescbin($r['data']['content']);
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if(strpos($fname,'store') !== false)
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$istream = fopen($fname,'rb');
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else
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$istream = fopen('store/' . $channel['channel_address'] . '/' . $fname,'rb');
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$ostream = fopen('php://output','wb');
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if($istream && $ostream) {
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pipe_streams($istream,$ostream);
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fclose($istream);
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fclose($ostream);
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}
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}
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else {
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echo dbunescbin($r['data']['content']);
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}
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killme();
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}
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}
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