chrome/services/cups_proxy/ipp_attribute_validator.h

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_SERVICES_CUPS_PROXY_IPP_ATTRIBUTE_VALIDATOR_H_
#define CHROME_SERVICES_CUPS_PROXY_IPP_ATTRIBUTE_VALIDATOR_H_

#include <cups/ipp.h>

#include <string>

#include "chrome/services/ipp_parser/public/mojom/ipp_parser.mojom.h"

namespace cups_proxy {

enum ValidateAttributeResult {
  kSuccess = 0,

  // Unknown attribute name.
  kUnknownAttribute,
  kFatalError,
  kMaxValue,
};

// Validates an attribute |name| of type |type| in operation |ipp_oper_id|.
// |values_count| represents number of values in the attribute. The following
// constraints are enforced:
// - only operations from predefined set are accepted
// - only attributes from predefined set are accepted
// - serialization type of the attribute must match the specification
// - a single-value attribute cannot have more than one value
// - a set-of-values attribute cannot be empty
// Returns kFatalError <=> at least one of the constraints has been violated.
ValidateAttributeResult ValidateAttribute(
    ipp_op_t ipp_oper_id,
    const std::string& name,
    ipp_parser::mojom::IppAttributeValue::Tag type,
    size_t values_count);

}  // namespace cups_proxy

#endif  // CHROME_SERVICES_CUPS_PROXY_IPP_ATTRIBUTE_VALIDATOR_H_