oauth_transaction.h

#ifndef SOURCEMETA_CORE_OAUTH_TRANSACTION_H_
#define SOURCEMETA_CORE_OAUTH_TRANSACTION_H_
 
#ifndef SOURCEMETA_CORE_OAUTH_EXPORT
#include <sourcemeta/core/oauth_export.h>
#endif
 
#include <sourcemeta/core/oauth_authorization.h>
 
#include <array>       // std::array
#include <cstdint>     // std::uint8_t
#include <optional>    // std::optional
#include <string_view> // std::string_view
 
namespace sourcemeta::core {

struct OAuthTransactionSecrets {
  std::array<char, 43> state;
  std::array<char, 43> code_verifier;
};

struct OAuthTransaction {
  std::string_view state;
  std::string_view code_verifier;
  std::string_view issuer;
  std::string_view redirect_uri;
};

enum class OAuthIssuerSupport : std::uint8_t {
  Supported,
  NotSupported,
  Unknown
};

enum class OAuthCallbackError : std::uint8_t {
  State,
  ReceivedURI,
  Issuer,
  Declined,
  MissingCode
};

SOURCEMETA_CORE_OAUTH_EXPORT
auto oauth_transaction_mint() -> OAuthTransactionSecrets;

SOURCEMETA_CORE_OAUTH_EXPORT
auto oauth_transaction_check(const OAuthTransaction &transaction,
                             const OAuthAuthorizationResponse &response,
                             const OAuthIssuerSupport issuer_support,
                             const std::string_view received_uri,
                             std::string_view &code)
    -> std::optional<OAuthCallbackError>;
 
} // namespace sourcemeta::core
 
#endif