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// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Common/HttpRequest.h"
#include <chrono>
#include <cstddef>
#include <mutex>
#include <curl/curl.h>
#include "Common/Logging/Log.h"
#include "Common/ScopeGuard.h"
#include "Common/StringUtil.h"
namespace Common
{
class HttpRequest::Impl final
{
public:
enum class Method
{
GET,
POST,
};
explicit Impl(std::chrono::milliseconds timeout_ms, ProgressCallback callback);
bool IsValid() const;
void SetCookies(const std::string& cookies);
void UseIPv4();
void FollowRedirects(long max);
Response Fetch(const std::string& url, Method method, const Headers& headers, const u8* payload,
size_t size, AllowedReturnCodes codes = AllowedReturnCodes::Ok_Only);
static int CurlProgressCallback(Impl* impl, double dlnow, double dltotal, double ulnow,
double ultotal);
std::string EscapeComponent(const std::string& string);
private:
static inline std::once_flag s_curl_was_initialized;
ProgressCallback m_callback;
std::unique_ptr<CURL, decltype(&curl_easy_cleanup)> m_curl{nullptr, curl_easy_cleanup};
std::string m_error_string;
};
HttpRequest::HttpRequest(std::chrono::milliseconds timeout_ms, ProgressCallback callback)
: m_impl(std::make_unique<Impl>(timeout_ms, std::move(callback)))
{
}
HttpRequest::~HttpRequest() = default;
bool HttpRequest::IsValid() const
{
return m_impl->IsValid();
}
void HttpRequest::SetCookies(const std::string& cookies)
{
m_impl->SetCookies(cookies);
}
void HttpRequest::UseIPv4()
{
m_impl->UseIPv4();
}
void HttpRequest::FollowRedirects(long max)
{
m_impl->FollowRedirects(max);
}
std::string HttpRequest::EscapeComponent(const std::string& string)
{
return m_impl->EscapeComponent(string);
}
HttpRequest::Response HttpRequest::Get(const std::string& url, const Headers& headers,
AllowedReturnCodes codes)
{
return m_impl->Fetch(url, Impl::Method::GET, headers, nullptr, 0, codes);
}
HttpRequest::Response HttpRequest::Post(const std::string& url, const std::vector<u8>& payload,
const Headers& headers, AllowedReturnCodes codes)
{
return m_impl->Fetch(url, Impl::Method::POST, headers, payload.data(), payload.size(), codes);
}
HttpRequest::Response HttpRequest::Post(const std::string& url, const std::string& payload,
const Headers& headers, AllowedReturnCodes codes)
{
return m_impl->Fetch(url, Impl::Method::POST, headers,
reinterpret_cast<const u8*>(payload.data()), payload.size(), codes);
}
int HttpRequest::Impl::CurlProgressCallback(Impl* impl, double dlnow, double dltotal, double ulnow,
double ultotal)
{
// Abort if callback isn't true
return !impl->m_callback(dlnow, dltotal, ulnow, ultotal);
}
HttpRequest::Impl::Impl(std::chrono::milliseconds timeout_ms, ProgressCallback callback)
: m_callback(std::move(callback))
{
std::call_once(s_curl_was_initialized, [] { curl_global_init(CURL_GLOBAL_DEFAULT); });
m_curl.reset(curl_easy_init());
if (!m_curl)
return;
curl_easy_setopt(m_curl.get(), CURLOPT_NOPROGRESS, m_callback == nullptr);
if (m_callback)
{
curl_easy_setopt(m_curl.get(), CURLOPT_PROGRESSDATA, this);
curl_easy_setopt(m_curl.get(), CURLOPT_PROGRESSFUNCTION, CurlProgressCallback);
}
// Set up error buffer
m_error_string.resize(CURL_ERROR_SIZE);
curl_easy_setopt(m_curl.get(), CURLOPT_ERRORBUFFER, m_error_string.data());
// libcurl may not have been built with async DNS support, so we disable
// signal handlers to avoid a possible and likely crash if a resolve times out.
curl_easy_setopt(m_curl.get(), CURLOPT_NOSIGNAL, true);
curl_easy_setopt(m_curl.get(), CURLOPT_CONNECTTIMEOUT_MS, static_cast<long>(timeout_ms.count()));
// Sadly CURLOPT_LOW_SPEED_TIME doesn't have a millisecond variant so we have to use seconds
curl_easy_setopt(
m_curl.get(), CURLOPT_LOW_SPEED_TIME,
static_cast<long>(std::chrono::duration_cast<std::chrono::seconds>(timeout_ms).count()));
curl_easy_setopt(m_curl.get(), CURLOPT_LOW_SPEED_LIMIT, 1);
#ifdef _WIN32
// ALPN support is enabled by default but requires Windows >= 8.1.
curl_easy_setopt(m_curl.get(), CURLOPT_SSL_ENABLE_ALPN, false);
#endif
}
bool HttpRequest::Impl::IsValid() const
{
return m_curl != nullptr;
}
void HttpRequest::Impl::SetCookies(const std::string& cookies)
{
curl_easy_setopt(m_curl.get(), CURLOPT_COOKIE, cookies.c_str());
}
void HttpRequest::Impl::UseIPv4()
{
curl_easy_setopt(m_curl.get(), CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
}
void HttpRequest::Impl::FollowRedirects(long max)
{
curl_easy_setopt(m_curl.get(), CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(m_curl.get(), CURLOPT_MAXREDIRS, max);
}
std::string HttpRequest::Impl::EscapeComponent(const std::string& string)
{
char* escaped = curl_easy_escape(m_curl.get(), string.c_str(), static_cast<int>(string.size()));
std::string escaped_str(escaped);
curl_free(escaped);
return escaped_str;
}
static size_t CurlWriteCallback(char* data, size_t size, size_t nmemb, void* userdata)
{
auto* buffer = static_cast<std::vector<u8>*>(userdata);
const size_t actual_size = size * nmemb;
buffer->insert(buffer->end(), data, data + actual_size);
return actual_size;
}
HttpRequest::Response HttpRequest::Impl::Fetch(const std::string& url, Method method,
const Headers& headers, const u8* payload,
size_t size, AllowedReturnCodes codes)
{
curl_easy_setopt(m_curl.get(), CURLOPT_POST, method == Method::POST);
curl_easy_setopt(m_curl.get(), CURLOPT_URL, url.c_str());
if (method == Method::POST)
{
curl_easy_setopt(m_curl.get(), CURLOPT_POSTFIELDS, payload);
curl_easy_setopt(m_curl.get(), CURLOPT_POSTFIELDSIZE, size);
}
curl_slist* list = nullptr;
Common::ScopeGuard list_guard{[&list] { curl_slist_free_all(list); }};
for (const auto& [name, value] : headers)
{
if (!value)
list = curl_slist_append(list, (name + ':').c_str());
else if (value->empty())
list = curl_slist_append(list, (name + ';').c_str());
else
list = curl_slist_append(list, (name + ": " + *value).c_str());
}
curl_easy_setopt(m_curl.get(), CURLOPT_HTTPHEADER, list);
std::vector<u8> buffer;
curl_easy_setopt(m_curl.get(), CURLOPT_WRITEFUNCTION, CurlWriteCallback);
curl_easy_setopt(m_curl.get(), CURLOPT_WRITEDATA, &buffer);
const char* type = method == Method::POST ? "POST" : "GET";
const CURLcode res = curl_easy_perform(m_curl.get());
if (res != CURLE_OK)
{
ERROR_LOG(COMMON, "Failed to %s %s: %s", type, url.c_str(), m_error_string.c_str());
return {};
}
if (codes == AllowedReturnCodes::All)
return buffer;
long response_code = 0;
curl_easy_getinfo(m_curl.get(), CURLINFO_RESPONSE_CODE, &response_code);
if (response_code != 200)
{
ERROR_LOG(COMMON, "Failed to %s %s: server replied with code %li and body\n\x1b[0m%.*s", type,
url.c_str(), response_code, static_cast<int>(buffer.size()), buffer.data());
return {};
}
return buffer;
}
} // namespace Common
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