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// Copyright Epic Games, Inc. All Rights Reserved.
#include "zenhttp/auth/oidc.h"
ZEN_THIRD_PARTY_INCLUDES_START
#include <cpr/cpr.h>
#include <fmt/format.h>
#include <json11.hpp>
ZEN_THIRD_PARTY_INCLUDES_END
namespace zen {
namespace details {
using StringArray = std::vector<std::string>;
StringArray ToStringArray(const json11::Json JsonArray)
{
StringArray Result;
const auto& Items = JsonArray.array_items();
for (const auto& Item : Items)
{
Result.push_back(Item.string_value());
}
return Result;
}
} // namespace details
using namespace std::literals;
OidcClient::OidcClient(const OidcClient::Options& Options)
{
m_BaseUrl = std::string(Options.BaseUrl);
m_ClientId = std::string(Options.ClientId);
}
OidcClient::InitResult
OidcClient::Initialize()
{
ExtendableStringBuilder<256> Uri;
Uri << m_BaseUrl << "/.well-known/openid-configuration"sv;
cpr::Session Session;
Session.SetOption(cpr::Url{Uri.c_str()});
cpr::Response Response = Session.Get();
if (Response.error)
{
return {.Reason = std::move(Response.error.message)};
}
if (Response.status_code != 200)
{
return {.Reason = std::move(Response.reason)};
}
std::string JsonError;
json11::Json Json = json11::Json::parse(Response.text, JsonError);
if (JsonError.empty() == false)
{
return {.Reason = std::move(JsonError)};
}
m_Config = {.Issuer = Json["issuer"].string_value(),
.AuthorizationEndpoint = Json["authorization_endpoint"].string_value(),
.TokenEndpoint = Json["token_endpoint"].string_value(),
.UserInfoEndpoint = Json["userinfo_endpoint"].string_value(),
.RegistrationEndpoint = Json["registration_endpoint"].string_value(),
.JwksUri = Json["jwks_uri"].string_value(),
.SupportedResponseTypes = details::ToStringArray(Json["response_types_supported"]),
.SupportedResponseModes = details::ToStringArray(Json["response_modes_supported"]),
.SupportedGrantTypes = details::ToStringArray(Json["grant_types_supported"]),
.SupportedScopes = details::ToStringArray(Json["scopes_supported"]),
.SupportedTokenEndpointAuthMethods = details::ToStringArray(Json["token_endpoint_auth_methods_supported"]),
.SupportedClaims = details::ToStringArray(Json["claims_supported"])};
return {.Ok = true};
}
OidcClient::RefreshTokenResult
OidcClient::RefreshToken(std::string_view RefreshToken)
{
const std::string Body = fmt::format("grant_type=refresh_token&refresh_token={}&client_id={}", RefreshToken, m_ClientId);
cpr::Session Session;
Session.SetOption(cpr::Url{m_Config.TokenEndpoint.c_str()});
Session.SetOption(cpr::Header{{"Content-Type", "application/x-www-form-urlencoded"}});
Session.SetBody(cpr::Body{Body.data(), Body.size()});
cpr::Response Response = Session.Post();
if (Response.error)
{
return {.Reason = std::move(Response.error.message)};
}
if (Response.status_code != 200)
{
return {.Reason = fmt::format("{} ({})", Response.reason, Response.text)};
}
std::string JsonError;
json11::Json Json = json11::Json::parse(Response.text, JsonError);
if (JsonError.empty() == false)
{
return {.Reason = std::move(JsonError)};
}
return {.TokenType = Json["token_type"].string_value(),
.AccessToken = Json["access_token"].string_value(),
.RefreshToken = Json["refresh_token"].string_value(),
.IdentityToken = Json["id_token"].string_value(),
.Scope = Json["scope"].string_value(),
.ExpiresInSeconds = static_cast<int64_t>(Json["expires_in"].int_value()),
.Ok = true};
}
} // namespace zen
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