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<?php
include_once 'classes/UploadedFile.class.php';
include_once 'includes/settings.inc.php';
include_once 'includes/database.inc.php';
/**
* Generates a name for the file, retrying until we get an unused one
*
* @param UploadedFile $file
* @return string
*/
function generate_name ($file) {
// We start at N retries, and --N until we give up
$tries = POMF_FILES_RETRIES;
// We rip out the extension using pathinfo
// TODO: figure out a solution for .tar.gz and similar files?
$ext = pathinfo($file->name, PATHINFO_EXTENSION);
// Take the first 3 chars of the CRC32 checksum
$hashchunk = substr($file->get_crc32(), 0, 3);
do {
// If we run out of tries, throw an exception. Should be caught and JSONified.
if ($tries-- == 0) throw new Exception('Gave up trying to find an unused name');
// TODO: come up with a better name generating algorithm
$newname = ''; // Filename Generator:
$newname .= chr(mt_rand(ord("a"), ord("z"))); // + random lowercase letter
$newname .= $hashchunk; // + first 3 of crc32b checksum
$newname .= chr(mt_rand(ord("a"), ord("z"))); // + random lowercase letter
$newname .= '.' . $ext; // + '.' + extension
} while (file_exists(POMF_FILES_ROOT . $newname)); // TODO: check the database instead?
return $newname;
}
/**
* Handles the uploading and db entry for a file
*
* @param UploadedFile $file
* @return array
*/
function upload_file ($file) {
global $db;
// If the file has an error attached, we just throw it as an exception.
if ($file->error) throw new Exception($file->error);
// Check if we have a file with that hash in the db
$q = $db->prepare("SELECT hash, filename, size FROM files WHERE hash = (:hash)");
$q->bindValue('hash', $file->get_sha1());
$q->execute();
$result = $q->fetch();
// If we found a file with the same checksums, then we can assume it's a dupe
// so we don't bother with it, and just unlink (delete) the tmpfile and return
// the previous data.
if ($result['hash'] === $file->get_sha1()) {
unlink($file->tempfile);
return array(
'hash' => $result['hash'],
'name' => $file->name,
'url' => $result['filename'],
'size' => $result['size']
);
} else {
// Generate a name for the file
$newname = generate_name($file);
// Attempt to move it to the static directory
if (move_uploaded_file($file->tempfile, POMF_FILES_ROOT . $newname)) {
// Add it to the database
$q = $db->prepare('INSERT INTO files (hash, orginalname, filename, size, date, expire, delid)' .
'VALUES (:hash, :orig, :name, :size, :date, :expires, :delid)');
$q->bindValue(':hash', $file->get_sha1());
$q->bindValue(':orig', $file->name);
$q->bindValue(':name', $newname);
$q->bindValue(':size', $file->size);
$q->bindValue(':date', date('Y-m-d'));
$q->bindValue(':expires', null);
$q->bindValue(':delid', sha1($file->tempfile));
$q->execute();
return array(
'hash' => $file->get_sha1(),
'name' => $file->name,
'url' => $newname,
'size' => $file->size
);
} else {
throw new Exception('Failed to move file to destination');
}
}
}
/**
* Reorganize the $_FILES array into something saner
*
* @param $_FILES
*/
function refiles ($files) {
$out = array();
for ($i = 0, $n = count($files['name']); $i < $n; ++$i) {
// We create a new UploadedFile instance
$file = new UploadedFile();
// And fill it with our shit
$file->name = $files['name'][$i];
$file->mime = $files['type'][$i];
$file->tempfile = $files['tmp_name'][$i];
$file->error = $files['error'][$i];
$file->size = $files['size'][$i];
$out[] = $file;
}
return $out;
}
/**
* Give a response that gyazo understands
*/
function respond_gyazo ($code, $files) {
if ($files instanceof Exception) {
echo "ERROR: " . $files->getMessage();
} else {
echo 'http://a.pomf.se/' . $files[0]['url'];
}
}
/**
* Responds to a request in CSV form.
*/
function respond_csv ($code, $files) {
if ($files instanceof Exception) {
echo "error\n";
echo $files->getMessage() . "\n";
} else {
echo "name,url,hash,size\n";
foreach ($files as $file) {
echo "${file['name']},${file['url']},${file['hash']},${file['size']}\n";
}
}
}
/**
* Responds to a request in JSON form.
*/
function respond_json ($code, $files) {
// Now we send the response based on the type
if ($files instanceof Exception) {
// If it's an Exception, we put the message in the error field
echo json_encode(array(
'success' => false,
'error' => $files->getMessage()
));
} elseif (is_array($files)) {
echo json_encode(array(
'success' => true,
'error' => null,
'files' => $files
));
}
}
/**
* Determines the proper response function based on $_GET['output]
*/
function respond ($code, $files = null) {
if (is_int($code)) { // If the code is an integer, we assume it's a response code
http_response_code($code);
} else { // Otherwise we just use the default and shift
http_response_code(200);
$files = $code;
}
$format = array_key_exists('output', $_GET) ? $_GET['output'] : 'json';
switch ($format) {
case 'gyazo':
respond_gyazo($code, $files);
break;
case 'csv':
respond_csv($code, $files);
break;
case 'json':
respond_json($code, $files);
break;
}
}
if (isset($_FILES['files'])) {
try {
$uploads = refiles($_FILES['files']);
foreach ($uploads as $upload) {
$out[] = upload_file($upload);
}
respond($out);
} catch (Exception $e) {
respond(500, $e);
}
} else {
respond(500, new Exception('Nigga what you doin\' here?'));
}
?>
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