function maybeString() { return $this->ifOk(function ($x) { if (trim($x) === '') { return Result::none($x); } else { return Result::ok($x); } }); }
function getSubmissionPart($against) { # Validating file inputs is a rather difficult task. # This solution is based on: http://php.net/manual/en/features.file-upload.php#114004 # It should be pretty bullet-proof, which is important because # it is easy to create security vulnerabilities with file uploads. return $against->files($this->name)->ifOk(function ($val) { # See http://php.net/manual/en/features.file-upload.php if (!is_array($val) || !isset($val['error']) || is_array($val['error'])) { return Result::error('Invalid data.'); } else { if ($val['error'] === UPLOAD_ERR_INI_SIZE || $val['error'] === UPLOAD_ERR_FORM_SIZE) { return Result::error('File size exceeds server or form limit.'); } else { if ($val['error'] === UPLOAD_ERR_NO_FILE) { return Result::none(null); } else { if ($val['error'] === UPLOAD_ERR_OK) { return Result::ok($val); } else { return Result::error('Error uploading file.'); } } } } })->requiredMaybe($this->required)->ifOk(function ($file) { if ($file['size'] > $this->maxSize) { return Result::error('File must be under ' . $this->maxSize . ' bytes in size.'); } else { return Result::ok($file); } })->ifOk(function ($file) { $finfo = new finfo(FILEINFO_MIME_TYPE); $mime = $finfo->file($file['tmp_name']); $ext = array_search($mime, $this->allowedExtensions, true); if ($ext === false) { return Result::error('Invalid file type or wrong MIME type. Allowed extensions are: ' . implode(', ', array_keys($this->allowedExtensions)) . '.'); } if (!is_uploaded_file($file['tmp_name'])) { return Result::error('Security error.'); } $filename = sha1_file($file['tmp_name']) . '-' . floor(microtime(true)) . '.' . $ext; return Result::ok(new FileInfo($file, $filename, $mime, $this->permissions)); })->name($this->name); }