web-base/core/Api/FileAPI.class.php

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<?php
namespace Api {
use Driver\SQL\Condition\Compare;
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use Driver\SQL\Condition\CondIn;
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use Driver\SQL\Condition\CondNull;
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use Driver\SQL\SQL;
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use External\ZipStream\BufferWriter;
use External\ZipStream\File;
use External\ZipStream\ZipStream;
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abstract class FileAPI extends Request {
protected function checkDirectory($parentId) {
if ($parentId === null) {
return true;
}
$sql = $this->user->getSQL();
$res = $sql->select("directory")
->from("UserFile")
->where(new Compare("uid", $parentId))
->limit(1)
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
if (empty($res)) {
return $this->createError("Parent directory not found");
} else if(!$res[0]["directory"]) {
return $this->createError("Parent file is not a directory");
}
}
return $this->success;
}
protected function downloadFile($name, $path) {
if (!file_exists($path)) {
http_response_code(404);
die("404 - File does not exist anymore");
} else if(!is_file($path) || !is_readable($path)) {
die("403 - Unable to download file.");
} else {
$mimeType = @mime_content_type($path);
if ($mimeType) {
header("Content-Type: $mimeType");
}
$name = trim(preg_replace('/\s\s+/', ' ', $name));
header("Content-Disposition: attachment; filename=$name");
//No cache
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
//Define file size
header('Content-Length: ' . filesize($path));
ob_clean();
flush();
readfile($path);
exit;
}
}
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protected function downloadZip($files) {
if ($files == null || empty($files) || !is_array($files)) {
return $this->createError("No files to download");
}
header('Content-Disposition: attachment; filename="files.zip"');
header('Content-Type: application/zip');
$writer = new BufferWriter();
$writer->registerCallback(function ($w) { echo $w->read(); });
$zipStream = new ZipStream($writer);
foreach ($files as $file) {
$f = new File($file["name"]);
$f->loadFromFile($file["path"]);
$zipStream->saveFile($f);
}
$zipStream->close();
exit;
}
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protected function &findDirectory(&$files, $id) {
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if ($id !== null) {
$id = (string)$id;
if (isset($files[$id])) {
return $files[$id]["items"];
} else {
foreach ($files as &$dir) {
if ($dir["isDirectory"]) {
$target =& $this->findDirectory($dir["items"], $id);
if ($target !== $dir["items"]) {
return $target;
}
}
}
return $files;
}
} else {
return $files;
}
}
protected function createFileList($res) {
$files = array();
foreach ($res as $row) {
if ($row["uid"] === null) continue;
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$fileId = $row["uid"];
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$parentId = $row["parentId"];
$fileName = $row["name"];
$isDirectory = $row["directory"];
$fileElement = array("uid" => $fileId, "name" => $fileName, "isDirectory" => $isDirectory);
if ($isDirectory) {
$fileElement["items"] = array();
} else {
$fileElement["size"] = @filesize($row["path"]);
$fileElement["mimeType"] = @mime_content_type($row["path"]);
}
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$dir =& $this->findDirectory($files, $parentId);
$dir[$fileId] = $fileElement;
unset($dir);
}
return $files;
}
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protected function filterFiles(SQL $sql, $query, $id, $token = null) {
if (is_array($id)) {
$query->where(new CondIn("UserFile.uid", $id));
} else {
$query->where(new Compare("UserFile.uid", $id));
}
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if (is_null($token)) {
$query->where(new Compare("user_id", $this->user->getId()));
} else {
$query->innerJoin("UserFileTokenFile", "UserFile.uid", "file_id")
->innerJoin("UserFileToken", "UserFileToken.uid", "token_id")
->where(new Compare("token", $token))
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->where(new CondNull("valid_until"), new Compare("valid_until", $sql->now(), ">="));
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}
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}
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private static function unitToBytes($var) : int {
if (is_int($var) || is_numeric($var)) {
return intval($var);
} else {
preg_match("/(\\d+)([KMG])/", $var, $re);
if ($re) {
$units = ["K","M","G"];
$value = intval($re[1]);
$unitIndex = array_search($re[2], $units);
return $value * pow(1024, $unitIndex + 1);
} else {
return -1; // some weird error here
}
}
}
protected function getMaxFileSizePHP() : int {
$uploadMaxFilesize = $this->unitToBytes(ini_get("upload_max_filesize"));
$postMaxSize = $this->unitToBytes(ini_get("post_max_size"));
return min($uploadMaxFilesize, $postMaxSize);
}
protected function getMaxFiles() : int {
return intval(ini_get("max_file_uploads"));
}
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}
}
namespace Api\File {
use Api\FileAPI;
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use Api\Parameter\ArrayType;
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use Api\Parameter\Parameter;
use Api\Parameter\StringType;
use Driver\SQL\Condition\Compare;
use Driver\SQL\Condition\CondIn;
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use Driver\SQL\Condition\CondNull;
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use Objects\User;
class ValidateToken extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
'token' => new StringType('token', 36, false)
));
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$sql = $this->user->getSQL();
$token = $this->getParam("token");
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$res = $sql->select("UserFile.uid", "valid_until", "token_type",
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"maxFiles", "maxSize", "extensions", "name", "path", "directory", "UserFile.parent_id as parentId")
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->from("UserFileToken")
->leftJoin("UserFileTokenFile", "UserFileToken.uid", "token_id")
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->leftJoin("UserFile", "UserFile.uid", "file_id")
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->where(new Compare("token", $token))
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->where(new CondNull("valid_until"), new Compare("valid_until", $sql->now(), ">="))
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->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
if (empty($res)) {
return $this->createError("Invalid Token");
} else {
$row = $res[0];
$this->result["token"] = array(
"type" => $row["token_type"],
"valid_until" => $row["valid_until"]
);
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$this->result["files"] = $this->createFileList($res);
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if ($row["token_type"] === "upload") {
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$maxFiles = ($row["maxFiles"] ?? 0);
$maxSize = ($row["maxSize"] ?? 0);
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$this->result["restrictions"] = array(
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"maxFiles" => ($maxFiles <= 0 ? $this->getMaxFiles() : min($this->getMaxFiles(), $maxFiles)),
"maxSize" => ($maxSize <= 0 ? $this->getMaxFileSizePHP() : min($this->getMaxFileSizePHP(), $maxSize)),
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"extensions" => $row["extensions"] ?? "",
"parentId" => $row["parentId"] ?? 0
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);
}
}
}
return $this->success;
}
}
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class GetRestrictions extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array());
$this->csrfTokenRequired = false;
$this->loginRequired = true;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$this->result["restrictions"] = array(
"maxFiles" => $this->getMaxFiles(),
"maxSize" => $this->getMaxFileSizePHP()
);
return true;
}
}
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class RevokeToken extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
"token" => new StringType("token", 36)
));
$this->loginRequired = true;
$this->csrfTokenRequired = true;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$sql = $this->user->getSQL();
$token = $this->getParam("token");
$res = $sql->select($sql->count())
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->from("UserFileToken")
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->where(new Compare("user_id", $this->user->getId()))
->where(new Compare("token", $token))
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
if(empty($res)) {
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return $this->createError("Invalid token");
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} else {
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$res = $sql->update("UserFileToken")
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->set("valid_until", new \DateTime())
->where(new Compare("user_id", $this->user->getId()))
->where(new Compare("token", $token))
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
}
}
return $this->success;
}
}
class ListFiles extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
"directory" => new Parameter("directory", Parameter::TYPE_INT, true, null)
));
$this->loginRequired = true;
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$sql = $this->user->getSQL();
$res = $sql->select(
"UserFile.uid", "UserFile.directory", "UserFile.path", "UserFile.name",
"UserFile.user_id", "parentTable.uid as parentId", "parentTable.name as parentName")
->from("UserFile")
->leftJoin("UserFile", "UserFile.parent_id", "parentTable.uid", "parentTable")
->where(new Compare("UserFile.user_id", $this->user->getId()))
->orderBy("UserFile.parent_id")
->ascending()
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
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$files = $this->createFileList($res);
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$directoryId = $this->getParam("directory");
if (!is_null($directoryId)) {
$wantedDir =& $this->findDirectory($files, $directoryId);
if ($files === $wantedDir) {
$files = array();
} else {
$files = $wantedDir;
}
}
$this->result["files"] = $files;
}
return $this->success;
}
}
class ListTokens extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array());
$this->loginRequired = true;
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$sql = $this->user->getSQL();
$res = $sql->select("uid","token","valid_until","token_type", "maxFiles", "maxSize", "extensions")
->from("UserFileToken")
->orderBy("valid_until")
->descending()
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
$this->result["tokens"] = array();
foreach ($res as $row) {
$tokenType = $row["token_type"];
if ($tokenType !== "upload") {
unset($row["maxFiles"]);
unset($row["maxSize"]);
unset($row["extensions"]);
}
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unset($row["token_type"]);
$row["type"] = $tokenType;
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$this->result["tokens"][] = $row;
}
}
return $this->success;
}
}
class CreateDirectory extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
'name' => new StringType('name', 32),
'parentId' => new Parameter('parentId', Parameter::TYPE_INT, true, null)
));
$this->loginRequired = true;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$sql = $this->user->getSQL();
$name = $this->getParam('name');
$parentId = $this->getParam("parentId");
if (!$this->checkDirectory($parentId)) {
return $this->success;
}
$res = $sql->insert("UserFile", array("directory", "name", "user_id", "parent_id"))
->addRow(true, $name, $this->user->getId(), $parentId)
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
return $this->success;
}
}
class Rename extends FileAPI { }
class Move extends FileAPI { }
class Upload extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
'parentId' => new Parameter('parentId', Parameter::TYPE_INT, true, null),
'token' => new StringType('token', 36, true, null)
));
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$token = $this->getParam("token");
if (!$this->user->isLoggedIn() && is_null($token)) {
return $this->createError("Permission denied (expected token)");
}
$sql = $this->user->getSQL();
$parentId = $this->getParam("parentId");
if (!is_null($token) && !is_null($parentId)) {
return $this->createError("Cannot upload to parent directory using token");
}
if (!is_null($parentId) && !$this->checkDirectory($parentId)) {
return $this->success;
}
$fileKeys = array_keys($_FILES);
$numFilesUploaded = count($fileKeys);
if (!is_null($token)) {
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$res = $sql->select("uid", "token_type", "maxFiles", "maxSize", "extensions", "user_id", "parent_id")
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->from("UserFileToken")
->where(new Compare("token", $token))
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->where(new CondNull("valid_until"), new Compare("valid_until", $sql->now(), ">="))
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->limit(1)
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if (!$this->success) {
return false;
}
if (empty($res) || $res[0]["token_type"] !== "upload") {
return $this->createError("Permission denied (token)");
}
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$parentId = $res[0]["parent_id"];
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$tokenId = $res[0]["uid"];
$maxFiles = $res[0]["maxFiles"] ?? 0;
$maxSize = $res[0]["maxSize"] ?? 0;
$userId = $res[0]["user_id"];
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$extensions = explode(",", trim(strtolower($res[0]["extensions"] ?? "")));
$extensions = array_filter($extensions);
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$res = $sql->select($sql->count())
->from("UserFileTokenFile")
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->where(new Compare("token_id", $tokenId))
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->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if (!$this->success) {
return false;
}
$count = $res[0]["count"];
if ($maxFiles > 0 && $numFilesUploaded > 0 && $numFilesUploaded + $count > $maxFiles) {
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return $this->createError("File limit exceeded. Currently uploaded $count / $maxFiles files");
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}
if ($maxSize > 0 || !empty($extensions)) {
foreach ($_FILES as $file) {
$name = $file["name"];
if ($maxSize > 0 && $file["size"] > $maxSize) {
return $this->createError("File Size limit of $maxSize bytes exceeded for file $name");
}
$dotPos = strrpos($name, ".");
$ext = ($dotPos !== false ? strtolower(substr($name, $dotPos + 1)) : false);
if (!empty($extensions) && $ext !== false && !in_array($ext, $extensions)) {
return $this->createError("File '$name' has prohibited extension. Allowed extensions: " . implode(",", $extensions));
}
}
}
} else {
$userId = $this->user->getId();
}
if ($numFilesUploaded === 0) {
return $this->createError("No file uploaded");
}
$uploadDir = realpath($_SERVER["DOCUMENT_ROOT"] . "/files/uploaded/");
if (!is_writable($uploadDir)) {
return $this->createError("Upload directory is not writable");
}
$fileIds = array();
foreach ($_FILES as $key => $file) {
$fileName = $file["name"];
$tmpPath = $file["tmp_name"];
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if (!$tmpPath) {
return $this->createError("Error uploading file: $fileName");
}
$md5Hash = @hash_file('md5', $tmpPath);
$sha1Hash = @hash_file('sha1', $tmpPath);
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$filePath = $uploadDir . "/" . $md5Hash . $sha1Hash;
if (move_uploaded_file($tmpPath, $filePath)) {
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$res = $sql->insert("UserFile", array("name", "directory", "path", "user_id", "parent_id"))
->addRow($fileName, false, $filePath, $userId, $parentId)
->returning("uid")
->execute();
if ($res === false) {
$this->lastError = $sql->getLastError();
$this->success = false;
return false;
} else {
$fileIds[] = $sql->getLastInsertId();
}
} else {
return $this->createError("Could not create file: " . $fileName);
}
}
if (!is_null($token)) {
$query = $sql->insert("UserFileTokenFile", array("file_id", "token_id"));
foreach ($fileIds as $fileId) {
$query->addRow($fileId, $tokenId);
}
$res = $query->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
}
return $this->success;
}
}
class Download extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
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"id" => new ArrayType("id", Parameter::TYPE_INT, true),
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"token" => new StringType("token", 36, true, null)
));
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$token = $this->getParam("token");
if (!$this->user->isLoggedIn() && is_null($token)) {
return $this->createError("Permission denied (expected token)");
}
$sql = $this->user->getSQL();
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$fileIds = array_unique($this->getParam("id"));
$query = $sql->select("UserFile.uid", "path", "name", "directory")->from("UserFile");
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$this->filterFiles($sql, $query, $fileIds, $token);
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$res = $query->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
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$foundFiles = array();
foreach ($res as $row) {
$foundFiles[$row["uid"]] = $row;
}
$filesToDownload = array();
foreach ($fileIds as $fileId) {
if (!array_key_exists($fileId, $foundFiles)) {
if (is_null($token)) {
return $this->createError("File not found: $fileId");
} else {
return $this->createError("Permission denied (token)");
}
} else if (!$foundFiles[$fileId]["directory"]) {
$filesToDownload[] = $foundFiles[$fileId];
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}
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}
if (empty($filesToDownload)) {
return $this->createError("No file selected");
} else if (count($filesToDownload) === 1) {
$file = array_shift($filesToDownload);
$path = $file["path"];
$name = $file["name"];
$this->downloadFile($name, $path);
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} else {
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$this->downloadZip($filesToDownload);
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}
}
return $this->success;
}
}
class Delete extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
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"id" => new ArrayType("id", Parameter::TYPE_INT, true),
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"token" => new StringType("token", 36, true, null)
));
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$this->csrfTokenRequired = true;
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}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
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$token = $this->getParam("token");
if (!$this->user->isLoggedIn() && is_null($token)) {
return $this->createError("Permission denied (expected token)");
}
$sql = $this->user->getSQL();
$fileIds = array_unique($this->getParam("id"));
$query = $sql->select("UserFile.uid", "path", "name")->from("UserFile");
$this->filterFiles($sql, $query, $fileIds, $token);
$res = $query->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
if (count($res) !== count($fileIds)) {
$foundFiles = array_map(function ($row) { return $row["uid"]; }, $res);
foreach($fileIds as $fileId) {
if (!in_array($fileId, $foundFiles)) {
return $this->createError("File not found: $fileId");
}
}
} else {
$res = $sql->delete("UserFile")
->where(new CondIn("uid", $fileIds))
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
}
}
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return $this->success;
}
}
class CreateUploadToken extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
"maxFiles" => new Parameter("maxFiles", Parameter::TYPE_INT, true, 1),
"maxSize" => new Parameter("maxSize", Parameter::TYPE_INT, true, null),
"extensions" => new StringType("extensions", 64, true, null),
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"durability" => new Parameter("durability", Parameter::TYPE_INT, true, 60*24*2),
"parentId" => new Parameter("parentId", Parameter::TYPE_INT, true, null)
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));
$this->loginRequired = true;
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$maxFiles = $this->getParam("maxFiles");
$maxSize = $this->getParam("maxSize");
$extensions = $this->getParam("extensions");
$durability = $this->getParam("durability");
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$parentId = $this->getParam("parentId");
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if (!is_null($maxFiles) && $maxFiles < 0) {
return $this->createError("Invalid number of maximum files.");
}
if (!is_null($maxSize) && $maxSize < 0) {
return $this->createError("Invalid maximum size for uploaded files.");
}
if (!is_null($durability) && $durability < 0) {
return $this->createError("Invalid durability.");
}
if (!is_null($extensions)) {
$extensions = explode(",",$extensions);
foreach ($extensions as $i => $ext) {
if (strlen($ext) === 0 || (strlen($ext) === 1 && $ext[0] === ".")) {
unset ($extensions[$i]);
} else if ($ext[0] === ".") {
$extensions[$i] = substr($ext, 1);
}
}
$extensions = implode(",", $extensions);
}
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if (!$this->checkDirectory($parentId)) {
return $this->success;
}
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$sql = $this->user->getSQL();
$token = generateRandomString(36);
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$validUntil = $durability == 0 ? null : (new \DateTime())->modify("+$durability MINUTES");
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$res = $sql->insert("UserFileToken",
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array("token", "token_type", "maxSize", "maxFiles", "extensions", "valid_until", "user_id", "parent_id"))
->addRow($token, "upload", $maxSize, $maxFiles, $extensions, $validUntil, $this->user->getId(), $parentId)
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->returning("uid")
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
$this->result["token"] = $token;
$this->result["tokenId"] = $sql->getLastInsertId();
}
return $this->success;
}
}
class CreateDownloadToken extends FileAPI {
public function __construct(User $user, bool $externalCall = false) {
parent::__construct($user, $externalCall, array(
"durability" => new Parameter("durability", Parameter::TYPE_INT, true, 60*24*2),
"files" => new Parameter("files", Parameter::TYPE_ARRAY, false)
));
$this->loginRequired = true;
$this->csrfTokenRequired = false;
}
public function execute($values = array()) {
if (!parent::execute($values)) {
return false;
}
$durability = $this->getParam("durability");
$fileIds = $this->getParam("files");
if (!is_null($durability) && $durability < 0) {
return $this->createError("Invalid durability.");
}
foreach ($fileIds as $fileId) {
if (!is_int($fileId) && is_numeric($fileId)) {
$fileId = intval($fileId);
}
if (!is_int($fileId) || $fileId < 1) {
return $this->createError("Invalid file id: $fileId");
}
}
$fileIds = array_unique($fileIds);
// Check for files:
$sql = $this->user->getSQL();
$res = $sql->select("uid")
->from("UserFile")
->where(new CondIn("uid", $fileIds))
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if (!$this->success) {
return false;
}
if (count($res) !== count($fileIds)) {
$foundFiles = array_map(function ($row) { return $row["uid"]; }, $res);
foreach ($fileIds as $fileId) {
if (!in_array($fileId, $foundFiles)) {
return $this->createError("File not found: $fileId");
}
}
}
// Insert
$token = generateRandomString(36);
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$validUntil = $durability == 0 ? null : (new \DateTime())->modify("+$durability MINUTES");
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$res = $sql->insert("UserFileToken", array("token_type", "valid_until", "user_id", "token"))
->addRow("download", $validUntil, $this->user->getId(), $token)
->returning("uid")
->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if (!$this->success) {
return false;
}
$tokenId = $sql->getLastInsertId();
$query = $sql->insert("UserFileTokenFile", array("token_id", "file_id"));
foreach ($fileIds as $fileId) {
$query->addRow($tokenId, $fileId);
}
$res = $query->execute();
$this->success = ($res !== false);
$this->lastError = $sql->getLastError();
if ($this->success) {
$this->result["token"] = $token;
}
return $this->success;
}
}
}