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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_BASE64URL_H_
#define BASE_BASE64URL_H_
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include "base/base_export.h"
#include "base/containers/span.h"
namespace base {
enum class Base64UrlEncodePolicy {
// Include the trailing padding in the output, when necessary.
INCLUDE_PADDING,
// Remove the trailing padding from the output.
OMIT_PADDING
};
// Encodes the |input| binary data in base64url, defined in RFC 4648:
// https://tools.ietf.org/html/rfc4648#section-5
//
// The |policy| defines whether padding should be included or omitted from the
// encoded |*output|. |input| and |*output| may reference the same storage.
BASE_EXPORT void Base64UrlEncode(span<const uint8_t> input,
Base64UrlEncodePolicy policy,
std::string* output);
// Same as the previous function, but accepts an input string.
BASE_EXPORT void Base64UrlEncode(std::string_view input,
Base64UrlEncodePolicy policy,
std::string* output);
enum class Base64UrlDecodePolicy {
// Require inputs contain trailing padding if non-aligned.
REQUIRE_PADDING,
// Accept inputs regardless of whether or not they have the correct padding.
IGNORE_PADDING,
// Reject inputs if they contain any trailing padding.
DISALLOW_PADDING
};
// Decodes the |input| string in base64url, defined in RFC 4648:
// https://tools.ietf.org/html/rfc4648#section-5
//
// The |policy| defines whether padding will be required, ignored or disallowed
// altogether. |input| and |*output| may reference the same storage.
[[nodiscard]] BASE_EXPORT bool Base64UrlDecode(std::string_view input,
Base64UrlDecodePolicy policy,
std::string* output);
// Same as the previous function, but writing to a `std::vector`.
[[nodiscard]] BASE_EXPORT std::optional<std::vector<uint8_t>> Base64UrlDecode(
std::string_view input,
Base64UrlDecodePolicy policy);
} // namespace base
#endif // BASE_BASE64URL_H_
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