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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <cstdlib>
#include <mutex>
#include <string>
#include <fmt/format.h>
#include <httplib.h>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/web_result.h"
#include "web_service/web_backend.h"
namespace WebService {
constexpr std::array<const char, 1> API_VERSION{'1'};
constexpr std::size_t TIMEOUT_SECONDS = 30;
struct Client::Impl {
Impl(std::string host, std::string username, std::string token)
: host{std::move(host)}, username{std::move(username)}, token{std::move(token)} {
std::lock_guard lock{jwt_cache.mutex};
if (this->username == jwt_cache.username && this->token == jwt_cache.token) {
jwt = jwt_cache.jwt;
}
// normalize host expression
if (!this->host.empty() && this->host.back() == '/') {
static_cast<void>(this->host.pop_back());
}
}
/// A generic function handles POST, GET and DELETE request together
Common::WebResult GenericRequest(const std::string& method, const std::string& path,
const std::string& data, bool allow_anonymous,
const std::string& accept) {
if (jwt.empty()) {
UpdateJWT();
}
if (jwt.empty() && !allow_anonymous) {
LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
return Common::WebResult{Common::WebResult::Code::CredentialsMissing,
"Credentials needed"};
}
auto result = GenericRequest(method, path, data, accept, jwt);
if (result.result_string == "401") {
// Try again with new JWT
UpdateJWT();
result = GenericRequest(method, path, data, accept, jwt);
}
return result;
}
/**
* A generic function with explicit authentication method specified
* JWT is used if the jwt parameter is not empty
* username + token is used if jwt is empty but username and token are
* not empty anonymous if all of jwt, username and token are empty
*/
Common::WebResult GenericRequest(const std::string& method, const std::string& path,
const std::string& data, const std::string& accept,
const std::string& jwt = "", const std::string& username = "",
const std::string& token = "") {
if (cli == nullptr) {
cli = std::make_unique<httplib::Client>(host.c_str());
cli->set_connection_timeout(TIMEOUT_SECONDS);
cli->set_read_timeout(TIMEOUT_SECONDS);
cli->set_write_timeout(TIMEOUT_SECONDS);
}
if (!cli->is_valid()) {
LOG_ERROR(WebService, "Invalid URL {}", host + path);
return Common::WebResult{Common::WebResult::Code::InvalidURL, "Invalid URL"};
}
httplib::Headers params;
if (!jwt.empty()) {
params = {
{std::string("Authorization"), fmt::format("Bearer {}", jwt)},
};
} else if (!username.empty()) {
params = {
{std::string("x-username"), username},
{std::string("x-token"), token},
};
}
params.emplace(std::string("api-version"),
std::string(API_VERSION.begin(), API_VERSION.end()));
if (method != "GET") {
params.emplace(std::string("Content-Type"), std::string("application/json"));
};
httplib::Request request;
request.method = method;
request.path = path;
request.headers = params;
request.body = data;
httplib::Result result = cli->send(request);
if (!result) {
LOG_ERROR(WebService, "{} to {} returned null", method, host + path);
return Common::WebResult{Common::WebResult::Code::LibError, "Null response"};
}
httplib::Response response = result.value();
if (response.status >= 400) {
LOG_ERROR(WebService, "{} to {} returned error status code: {}", method, host + path,
response.status);
return Common::WebResult{Common::WebResult::Code::HttpError,
std::to_string(response.status)};
}
auto content_type = response.headers.find("content-type");
if (content_type == response.headers.end()) {
LOG_ERROR(WebService, "{} to {} returned no content", method, host + path);
return Common::WebResult{Common::WebResult::Code::WrongContent, ""};
}
if (content_type->second.find(accept) == std::string::npos) {
LOG_ERROR(WebService, "{} to {} returned wrong content: {}", method, host + path,
content_type->second);
return Common::WebResult{Common::WebResult::Code::WrongContent, "Wrong content"};
}
return Common::WebResult{Common::WebResult::Code::Success, "", response.body};
}
// Retrieve a new JWT from given username and token
void UpdateJWT() {
if (username.empty() || token.empty()) {
return;
}
auto result = GenericRequest("POST", "/jwt/internal", "", "text/html", "", username, token);
if (result.result_code != Common::WebResult::Code::Success) {
LOG_ERROR(WebService, "UpdateJWT failed");
} else {
std::lock_guard lock{jwt_cache.mutex};
jwt_cache.username = username;
jwt_cache.token = token;
jwt_cache.jwt = jwt = result.returned_data;
}
}
std::string host;
std::string username;
std::string token;
std::string jwt;
std::unique_ptr<httplib::Client> cli;
struct JWTCache {
std::mutex mutex;
std::string username;
std::string token;
std::string jwt;
};
static inline JWTCache jwt_cache;
};
Client::Client(std::string host, std::string username, std::string token)
: impl{std::make_unique<Impl>(std::move(host), std::move(username), std::move(token))} {}
Client::~Client() = default;
Common::WebResult Client::PostJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return impl->GenericRequest("POST", path, data, allow_anonymous, "application/json");
}
Common::WebResult Client::GetJson(const std::string& path, bool allow_anonymous) {
return impl->GenericRequest("GET", path, "", allow_anonymous, "application/json");
}
Common::WebResult Client::DeleteJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return impl->GenericRequest("DELETE", path, data, allow_anonymous, "application/json");
}
Common::WebResult Client::GetPlain(const std::string& path, bool allow_anonymous) {
return impl->GenericRequest("GET", path, "", allow_anonymous, "text/plain");
}
Common::WebResult Client::GetImage(const std::string& path, bool allow_anonymous) {
return impl->GenericRequest("GET", path, "", allow_anonymous, "image/png");
}
Common::WebResult Client::GetExternalJWT(const std::string& audience) {
return impl->GenericRequest("POST", fmt::format("/jwt/external/{}", audience), "", false,
"text/html");
}
} // namespace WebService
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