mirror of
https://github.com/Rouji/single_php_filehost.git
synced 2025-04-04 16:39:34 +00:00
369 lines
10 KiB
PHP
Executable File
369 lines
10 KiB
PHP
Executable File
<?php
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$MAX_FILESIZE=512; //max. filesize in MiB
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$MAX_FILEAGE=180; //max. age of files in days
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$MIN_FILEAGE=31; //min. age of files in days
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$DECAY_EXP=2; //high values penalise larger files more
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$UPLOAD_TIMEOUT=5*60; //max. time an upload can take before it times out
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$ID_LENGTH=3; //length of the random file ID
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$STORE_PATH="files/"; //directory to store uploaded files in
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$LOG_PATH=null; //path to log uploads + resulting links to
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$DOWNLOAD_PATH="%s"; //the path part of the download url. %s = placeholder for filename
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$HTTP_PROTO="https"; //protocol to use in links
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$CLAM_SCAN=false; //scan files using clamd
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$MAX_EXT_LEN=7; //max. length for file extensions
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$ADMIN_EMAIL="admin@example.com"; //address for inquiries
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// generate a random string of characters with given length
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function rnd_str($len)
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{
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$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
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$max_idx = strlen($chars) - 1;
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$out = '';
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while ($len--)
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{
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$out .= $chars[mt_rand(0,$max_idx)];
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}
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return $out;
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}
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// check php.ini settings and print warnings if anything's not configured properly
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function check_config()
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{
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global $MAX_FILESIZE;
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global $UPLOAD_TIMEOUT;
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warn_config_value('upload_max_filesize', "MAX_FILESIZE", $MAX_FILESIZE);
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warn_config_value('post_max_size', "MAX_FILESIZE", $MAX_FILESIZE);
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warn_config_value('max_input_time', "UPLOAD_TIMEOUT", $UPLOAD_TIMEOUT);
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warn_config_value('max_execution_time', "UPLOAD_TIMEOUT", $UPLOAD_TIMEOUT);
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}
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function warn_config_value($ini_name, $var_name, $var_val)
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{
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$ini_val = intval(ini_get($ini_name));
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if ($ini_val < $var_val)
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printf("<pre>Warning: php.ini: %s (%s) set lower than %s (%s)\n</pre>",
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$ini_name,
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$ini_val,
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$var_name,
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$var_val);
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}
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// runs a file through clamdscan
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// fails silently(!) if clamd is not running or something
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function clam($path)
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{
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$cmd = 'clamdscan --quiet ' . escapeshellarg($path);
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$out = '';
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$ret = -1;
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exec($cmd, $out, $ret);
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return $ret != 1;
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}
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//extract extension from a path (does not include the dot)
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function get_ext($path)
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{
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global $MAX_EXT_LEN;
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$ext = pathinfo($path, PATHINFO_EXTENSION);
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//special handling of .tar.* archives
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$ext2 = pathinfo(substr($path,0,-(strlen($ext)+1)), PATHINFO_EXTENSION);
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if ($ext2 === 'tar')
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{
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$ext = $ext2.'.'.$ext;
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}
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//trim extension to max. 7 chars
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$ext = substr($ext, 0, $MAX_EXT_LEN);
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return $ext;
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}
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// store an uploaded file, given its name and temporary path (e.g. values straight out of $_FILES)
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// files are stored wit a randomised name, but with their original extension
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//
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// $name: original filename
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// $tmpFile: temporary path of uploaded file
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// $formatted: set to true to display formatted message instead of bare link
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function store_file($name, $tmpFile, $formatted = false)
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{
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global $STORE_PATH;
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global $ID_LENGTH;
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global $HTTP_PROTO;
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global $DOWNLOAD_PATH;
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global $MAX_FILESIZE;
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global $CLAM_SCAN;
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global $LOG_PATH;
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//create folder, if it doesn't exist
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if (!file_exists($STORE_PATH))
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{
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mkdir($STORE_PATH, 0750, true); //TODO: error handling
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}
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//check file size
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if (filesize($tmpFile) > $MAX_FILESIZE * 1024 * 1024)
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{
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header("HTTP/1.0 507 Max File Size Exceeded");
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return;
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}
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$ext = get_ext($name);
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$tries_per_len=3; //try random names a few times before upping the length
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for ($len = $ID_LENGTH; ; ++$len)
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{
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for ($n=0; $n<=$tries_per_len; ++$n)
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{
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$id = rnd_str($len);
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$basename = $id . (empty($ext) ? '' : '.' . $ext);
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$target_file = $STORE_PATH . $basename;
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if (!file_exists($target_file))
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break 2;
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}
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}
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$res = move_uploaded_file($tmpFile, $target_file);
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if ($res)
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{
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//scan file using clam
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if ($CLAM_SCAN && !clam($target_file))
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{
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unlink($target_file);
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header("HTTP/1.0 400 Bad Request");
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print("Error 400: File rejected by malware scan");
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return;
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}
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//print the download link of the file
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$url = sprintf('%s://%s/'.$DOWNLOAD_PATH,
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$HTTP_PROTO,
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$_SERVER["SERVER_NAME"],
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$basename);
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if ($formatted)
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{
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printf('<pre>Access your file here: <a href="%s">%s</a></pre>', $url, $url);
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}
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else
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{
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printf($url);
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}
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// log uploader's IP, original filename, etc.
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if ($LOG_PATH)
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{
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file_put_contents(
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$LOG_PATH,
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implode("\t", array(
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date('c'),
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$_SERVER['REMOTE_ADDR'],
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filesize($tmpFile),
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escapeshellarg($name),
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$basename
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)) . "\n",
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FILE_APPEND
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);
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}
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}
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else
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{
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//TODO: proper error handling?
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header("HTTP/1.0 520 Unknown Error");
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}
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}
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// purge all files older than their retention period allows.
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function purge_files()
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{
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global $STORE_PATH;
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global $MAX_FILEAGE;
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global $MAX_FILESIZE;
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global $MIN_FILEAGE;
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global $DECAY_EXP;
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$num_del = 0; //number of deleted files
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$total_size = 0; //total size of deleted files
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//for each stored file
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foreach (scandir($STORE_PATH) as $file)
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{
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//skip virtual . and .. files
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if ($file === '.' ||
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$file === '..')
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{
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continue;
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}
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$file = $STORE_PATH . $file;
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$file_size = filesize($file) / (1024*1024); //size in MiB
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$file_age = (time()-filemtime($file)) / (60*60*24); //age in days
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//keep all files below the min age
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if ($file_age < $MIN_FILEAGE)
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{
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continue;
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}
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//calculate the maximum age in days for this file
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$file_max_age = $MIN_FILEAGE +
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($MAX_FILEAGE - $MIN_FILEAGE) *
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pow(1-($file_size/$MAX_FILESIZE),$DECAY_EXP);
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//delete if older
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if ($file_age > $file_max_age)
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{
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unlink($file);
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printf("deleted \"%s\", %d MiB, %d days old\n", $file, $file_size, $file_age);
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$num_del += 1;
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$total_size += $file_size;
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}
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}
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printf("Deleted %d files totalling %d MiB\n", $num_del, $total_size);
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}
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// send a ShareX custom uploader config as .json
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function send_sharex_config()
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{
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global $HTTP_PROTO;
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$host = $_SERVER["HTTP_HOST"];
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$filename = $host.".sxcu";
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$content = <<<EOT
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{
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"Name": "$host",
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"DestinationType": "ImageUploader, FileUploader",
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"RequestType": "POST",
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"RequestURL": "$HTTP_PROTO://$host/",
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"FileFormName": "file",
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"ResponseType": "Text"
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}
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EOT;
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header("Content-type: application/octet-stream");
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header('Content-Disposition: attachment; filename="'.$filename.'"');
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header("Content-Length: ".strlen($content));
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print($content);
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}
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// send a Hupl uploader config as .hupl (which is just JSON)
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function send_hupl_config()
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{
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global $HTTP_PROTO;
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$host = $_SERVER["HTTP_HOST"];
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$filename = $host.".hupl";
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$content = <<<EOT
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{
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"name": "$host",
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"type": "http",
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"targetUrl": "$HTTP_PROTO://$host/",
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"fileParam": "file"
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}
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EOT;
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header("Content-type: application/octet-stream");
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header('Content-Disposition: attachment; filename="'.$filename.'"');
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header("Content-Length: ".strlen($content));
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print($content);
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}
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// print a plaintext info page, explaining what this script does and how to
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// use it, how to upload, etc.
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function print_index()
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{
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global $ADMIN_EMAIL;
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global $HTTP_PROTO;
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global $MAX_FILEAGE;
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global $MAX_FILESIZE;
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global $MIN_FILEAGE;
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global $DECAY_EXP;
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$url = $HTTP_PROTO."://".$_SERVER["HTTP_HOST"].$_SERVER['REQUEST_URI'];
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$sharex_url = $url."?sharex";
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$hupl_url = $url."?hupl";
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echo <<<EOT
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>x0.at Filehost</title>
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<meta name="description" content="Minimalistic service for sharing temporary files." />
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</head>
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<body>
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<pre>
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=== How To Upload ===
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You can upload files to this site via a simple HTTP POST, e.g. using curl:
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curl -F "file=@/path/to/your/file.jpg" $url
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On Windows, you can use <a href="https://getsharex.com/">ShareX</a> and import <a href="$sharex_url">this</a> custom uploader.
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On Android, you can use an app called <a href="https://github.com/Rouji/Hupl">Hupl</a> with <a href="$hupl_url">this</a> uploader.
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Or simply choose a file and click "Upload" below:
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(Hint: If you're lucky, your browser may support drag-and-drop onto the file
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selection input.)
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</pre>
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<form id="frm" method="post" enctype="multipart/form-data">
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<input type="file" name="file" id="file" />
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<input type="hidden" name="formatted" value="true" />
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<input type="submit" value="Upload"/>
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</form>
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<pre>
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=== File Sizes etc. ===
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The maximum allowed file size is $MAX_FILESIZE MiB.
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Files are kept for a minimum of $MIN_FILEAGE, and a maximum of $MAX_FILEAGE Days.
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How long a file is kept, depends on its size. Larger files are deleted earlier
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than small ones. This relation is non-linear and skewed in favour of small
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files.
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The exact formula for determining the maximum age for a file is:
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MIN_AGE + (MAX_AGE - MIN_AGE) * (1-(FILE_SIZE/MAX_SIZE))^$DECAY_EXP
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=== Source ===
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The PHP script used to provide this service is open source and available on
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<a href="https://github.com/Rouji/single_php_filehost">GitHub</a>
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=== Contact ===
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If you want to report abuse of this service, or have any other inquiries,
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please write an email to $ADMIN_EMAIL
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</pre>
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</body>
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</html>
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EOT;
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}
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// decide what to do, based on POST parameters etc.
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if (isset($_FILES["file"]["name"]) &&
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isset($_FILES["file"]["tmp_name"]) &&
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is_uploaded_file($_FILES["file"]["tmp_name"]))
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{
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//file was uploaded, store it
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$formatted = isset($_GET["formatted"]) || isset($_POST["formatted"]);
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store_file($_FILES["file"]["name"],
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$_FILES["file"]["tmp_name"],
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$formatted);
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}
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else if (isset($_GET['sharex']))
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{
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send_sharex_config();
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}
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else if (isset($_GET['hupl']))
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{
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send_hupl_config();
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}
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else if (isset($argv[1]) && $argv[1] === 'purge')
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{
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purge_files();
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}
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else
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{
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check_config();
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print_index();
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}
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