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ladybird/Services/RequestServer/ConnectionFromClient.cpp

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/*
* Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Badge.h>
#include <AK/IDAllocator.h>
#include <AK/NonnullOwnPtr.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/EventLoop.h>
#include <LibCore/Proxy.h>
#include <LibCore/Socket.h>
#include <LibRequests/NetworkErrorEnum.h>
#include <LibTextCodec/Decoder.h>
#include <LibWebSocket/ConnectionInfo.h>
#include <LibWebSocket/Message.h>
#include <RequestServer/ConnectionFromClient.h>
#include <RequestServer/RequestClientEndpoint.h>
#include <curl/curl.h>
namespace RequestServer {
ByteString g_default_certificate_path;
static HashMap<int, RefPtr<ConnectionFromClient>> s_connections;
static IDAllocator s_client_ids;
static long s_connect_timeout_seconds = 90L;
static HashMap<ByteString, ByteString> g_dns_cache; // host -> curl "resolve" string
static struct {
Optional<Core::SocketAddress> server_address;
Optional<ByteString> server_hostname;
u16 port;
bool use_dns_over_tls = true;
} g_dns_info;
static WeakPtr<Resolver> s_resolver {};
static NonnullRefPtr<Resolver> default_resolver()
{
if (auto resolver = s_resolver.strong_ref())
return *resolver;
auto resolver = make_ref_counted<Resolver>([] -> ErrorOr<DNS::Resolver::SocketResult> {
if (!g_dns_info.server_address.has_value()) {
if (!g_dns_info.server_hostname.has_value())
return Error::from_string_literal("No DNS server configured");
auto resolved = TRY(default_resolver()->dns.lookup(*g_dns_info.server_hostname)->await());
if (resolved->cached_addresses().is_empty())
return Error::from_string_literal("Failed to resolve DNS server hostname");
auto address = resolved->cached_addresses().first().visit([](auto& addr) -> Core::SocketAddress { return { addr, g_dns_info.port }; });
g_dns_info.server_address = address;
}
if (g_dns_info.use_dns_over_tls) {
return DNS::Resolver::SocketResult {
MaybeOwned<Core::Socket>(TRY(TLS::TLSv12::connect(*g_dns_info.server_address, *g_dns_info.server_hostname))),
DNS::Resolver::ConnectionMode::TCP,
};
}
return DNS::Resolver::SocketResult {
MaybeOwned<Core::Socket>(TRY(Core::BufferedSocket<Core::UDPSocket>::create(TRY(Core::UDPSocket::connect(*g_dns_info.server_address))))),
DNS::Resolver::ConnectionMode::UDP,
};
});
s_resolver = resolver;
return resolver;
}
struct ConnectionFromClient::ActiveRequest {
CURLM* multi { nullptr };
CURL* easy { nullptr };
i32 request_id { 0 };
RefPtr<Core::Notifier> notifier;
WeakPtr<ConnectionFromClient> client;
int writer_fd { 0 };
HTTP::HeaderMap headers;
bool got_all_headers { false };
bool is_connect_only { false };
size_t downloaded_so_far { 0 };
String url;
Optional<String> reason_phrase;
ByteBuffer body;
ActiveRequest(ConnectionFromClient& client, CURLM* multi, CURL* easy, i32 request_id, int writer_fd)
: multi(multi)
, easy(easy)
, request_id(request_id)
, client(client)
, writer_fd(writer_fd)
{
}
~ActiveRequest()
{
if (writer_fd > 0)
MUST(Core::System::close(writer_fd));
auto result = curl_multi_remove_handle(multi, easy);
VERIFY(result == CURLM_OK);
curl_easy_cleanup(easy);
}
void flush_headers_if_needed()
{
if (got_all_headers)
return;
got_all_headers = true;
long http_status_code = 0;
auto result = curl_easy_getinfo(easy, CURLINFO_RESPONSE_CODE, &http_status_code);
VERIFY(result == CURLE_OK);
client->async_headers_became_available(request_id, headers, http_status_code, reason_phrase);
}
};
size_t ConnectionFromClient::on_header_received(void* buffer, size_t size, size_t nmemb, void* user_data)
{
auto* request = static_cast<ActiveRequest*>(user_data);
size_t total_size = size * nmemb;
auto header_line = StringView { static_cast<char const*>(buffer), total_size };
// NOTE: We need to extract the HTTP reason phrase since it can be a custom value.
// Fetching infrastructure needs this value for setting the status message.
if (!request->reason_phrase.has_value() && header_line.starts_with("HTTP/"sv)) {
if (auto const space_positions = header_line.find_all(" "sv); space_positions.size() > 1) {
auto const second_space_offset = space_positions.at(1);
auto const reason_phrase_string_view = header_line.substring_view(second_space_offset + 1).trim_whitespace();
if (!reason_phrase_string_view.is_empty()) {
auto decoder = TextCodec::decoder_for_exact_name("ISO-8859-1"sv);
VERIFY(decoder.has_value());
request->reason_phrase = MUST(decoder->to_utf8(reason_phrase_string_view));
return total_size;
}
}
}
if (auto colon_index = header_line.find(':'); colon_index.has_value()) {
auto name = header_line.substring_view(0, colon_index.value()).trim_whitespace();
auto value = header_line.substring_view(colon_index.value() + 1, header_line.length() - colon_index.value() - 1).trim_whitespace();
request->headers.set(name, value);
}
return total_size;
}
size_t ConnectionFromClient::on_data_received(void* buffer, size_t size, size_t nmemb, void* user_data)
{
auto* request = static_cast<ActiveRequest*>(user_data);
request->flush_headers_if_needed();
size_t total_size = size * nmemb;
size_t remaining_length = total_size;
u8 const* remaining_data = static_cast<u8 const*>(buffer);
while (remaining_length > 0) {
auto result = Core::System::write(request->writer_fd, { remaining_data, remaining_length });
if (result.is_error()) {
if (result.error().code() != EAGAIN) {
dbgln("on_data_received: write failed: {}", result.error());
VERIFY_NOT_REACHED();
}
sched_yield();
continue;
}
auto nwritten = result.value();
if (nwritten == 0) {
dbgln("on_data_received: write returned 0");
VERIFY_NOT_REACHED();
}
remaining_data += nwritten;
remaining_length -= nwritten;
}
Optional<u64> content_length_for_ipc;
curl_off_t content_length = -1;
auto res = curl_easy_getinfo(request->easy, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T, &content_length);
if (res == CURLE_OK && content_length != -1) {
content_length_for_ipc = content_length;
}
request->downloaded_so_far += total_size;
return total_size;
}
int ConnectionFromClient::on_socket_callback(CURL*, int sockfd, int what, void* user_data, void*)
{
auto* client = static_cast<ConnectionFromClient*>(user_data);
if (what == CURL_POLL_REMOVE) {
client->m_read_notifiers.remove(sockfd);
client->m_write_notifiers.remove(sockfd);
return 0;
}
if (what & CURL_POLL_IN) {
client->m_read_notifiers.ensure(sockfd, [client, sockfd, multi = client->m_curl_multi] {
auto notifier = Core::Notifier::construct(sockfd, Core::NotificationType::Read);
notifier->on_activation = [client, sockfd, multi] {
int still_running = 0;
auto result = curl_multi_socket_action(multi, sockfd, CURL_CSELECT_IN, &still_running);
VERIFY(result == CURLM_OK);
client->check_active_requests();
};
notifier->set_enabled(true);
return notifier;
});
}
if (what & CURL_POLL_OUT) {
client->m_write_notifiers.ensure(sockfd, [client, sockfd, multi = client->m_curl_multi] {
auto notifier = Core::Notifier::construct(sockfd, Core::NotificationType::Write);
notifier->on_activation = [client, sockfd, multi] {
int still_running = 0;
auto result = curl_multi_socket_action(multi, sockfd, CURL_CSELECT_OUT, &still_running);
VERIFY(result == CURLM_OK);
client->check_active_requests();
};
notifier->set_enabled(true);
return notifier;
});
}
return 0;
}
int ConnectionFromClient::on_timeout_callback(void*, long timeout_ms, void* user_data)
{
auto* client = static_cast<ConnectionFromClient*>(user_data);
if (!client->m_timer)
return 0;
if (timeout_ms < 0) {
client->m_timer->stop();
} else {
client->m_timer->restart(timeout_ms);
}
return 0;
}
ConnectionFromClient::ConnectionFromClient(IPC::Transport transport)
: IPC::ConnectionFromClient<RequestClientEndpoint, RequestServerEndpoint>(*this, move(transport), s_client_ids.allocate())
, m_resolver(default_resolver())
{
s_connections.set(client_id(), *this);
m_curl_multi = curl_multi_init();
auto set_option = [this](auto option, auto value) {
auto result = curl_multi_setopt(m_curl_multi, option, value);
VERIFY(result == CURLM_OK);
};
set_option(CURLMOPT_SOCKETFUNCTION, &on_socket_callback);
set_option(CURLMOPT_SOCKETDATA, this);
set_option(CURLMOPT_TIMERFUNCTION, &on_timeout_callback);
set_option(CURLMOPT_TIMERDATA, this);
m_timer = Core::Timer::create_single_shot(0, [this] {
int still_running = 0;
auto result = curl_multi_socket_action(m_curl_multi, CURL_SOCKET_TIMEOUT, 0, &still_running);
VERIFY(result == CURLM_OK);
check_active_requests();
});
}
ConnectionFromClient::~ConnectionFromClient()
{
}
void ConnectionFromClient::die()
{
auto client_id = this->client_id();
s_connections.remove(client_id);
s_client_ids.deallocate(client_id);
if (s_connections.is_empty())
Core::EventLoop::current().quit(0);
}
Messages::RequestServer::ConnectNewClientResponse ConnectionFromClient::connect_new_client()
{
static_assert(IsSame<IPC::Transport, IPC::TransportSocket>, "Need to handle other IPC transports here");
int socket_fds[2] {};
if (auto err = Core::System::socketpair(AF_LOCAL, SOCK_STREAM, 0, socket_fds); err.is_error()) {
dbgln("Failed to create client socketpair: {}", err.error());
return IPC::File {};
}
auto client_socket_or_error = Core::LocalSocket::adopt_fd(socket_fds[0]);
if (client_socket_or_error.is_error()) {
close(socket_fds[0]);
close(socket_fds[1]);
dbgln("Failed to adopt client socket: {}", client_socket_or_error.error());
return IPC::File {};
}
auto client_socket = client_socket_or_error.release_value();
// Note: A ref is stored in the static s_connections map
auto client = adopt_ref(*new ConnectionFromClient(IPC::Transport(move(client_socket))));
return IPC::File::adopt_fd(socket_fds[1]);
}
Messages::RequestServer::IsSupportedProtocolResponse ConnectionFromClient::is_supported_protocol(ByteString const& protocol)
{
return protocol == "http"sv || protocol == "https"sv;
}
void ConnectionFromClient::set_dns_server(ByteString const& host_or_address, u16 port, bool use_tls)
{
if (host_or_address == g_dns_info.server_hostname && port == g_dns_info.port && use_tls == g_dns_info.use_dns_over_tls)
return;
auto result = [&] -> ErrorOr<void> {
Core::SocketAddress addr;
if (auto v4 = IPv4Address::from_string(host_or_address); v4.has_value())
addr = { v4.value(), port };
else if (auto v6 = IPv6Address::from_string(host_or_address); v6.has_value())
addr = { v6.value(), port };
else
TRY(default_resolver()->dns.lookup(host_or_address)->await())->cached_addresses().first().visit([&](auto& address) { addr = { address, port }; });
g_dns_info.server_address = addr;
g_dns_info.server_hostname = host_or_address;
g_dns_info.port = port;
g_dns_info.use_dns_over_tls = use_tls;
return {};
}();
if (result.is_error())
dbgln("Failed to set DNS server: {}", result.error());
else
default_resolver()->dns.reset_connection();
}
void ConnectionFromClient::start_request(i32 request_id, ByteString const& method, URL::URL const& url, HTTP::HeaderMap const& request_headers, ByteBuffer const& request_body, Core::ProxyData const& proxy_data)
{
if (!url.is_valid()) {
dbgln("StartRequest: Invalid URL requested: '{}'", url);
async_request_finished(request_id, 0, Requests::NetworkError::MalformedUrl);
return;
}
auto host = url.serialized_host().value().to_byte_string();
auto dns_promise = m_resolver->dns.lookup(host, DNS::Messages::Class::IN, Array { DNS::Messages::ResourceType::A, DNS::Messages::ResourceType::AAAA }.span());
auto resolve_result = dns_promise->await();
if (resolve_result.is_error()) {
dbgln("StartRequest: DNS lookup failed for '{}': {}", host, resolve_result.error());
async_request_finished(request_id, 0, Requests::NetworkError::UnableToResolveHost);
return;
}
auto dns_result = resolve_result.release_value();
if (dns_result->records().is_empty()) {
dbgln("StartRequest: DNS lookup failed for '{}'", host);
async_request_finished(request_id, 0, Requests::NetworkError::UnableToResolveHost);
return;
}
auto* easy = curl_easy_init();
if (!easy) {
dbgln("StartRequest: Failed to initialize curl easy handle");
return;
}
auto fds_or_error = Core::System::pipe2(O_NONBLOCK);
if (fds_or_error.is_error()) {
dbgln("StartRequest: Failed to create pipe: {}", fds_or_error.error());
return;
}
auto fds = fds_or_error.release_value();
auto writer_fd = fds[1];
auto reader_fd = fds[0];
async_request_started(request_id, IPC::File::adopt_fd(reader_fd));
auto request = make<ActiveRequest>(*this, m_curl_multi, easy, request_id, writer_fd);
request->url = url.to_string().value();
auto set_option = [easy](auto option, auto value) {
auto result = curl_easy_setopt(easy, option, value);
if (result != CURLE_OK) {
dbgln("StartRequest: Failed to set curl option: {}", curl_easy_strerror(result));
return false;
}
return true;
};
set_option(CURLOPT_PRIVATE, request.ptr());
if (!g_default_certificate_path.is_empty())
set_option(CURLOPT_CAINFO, g_default_certificate_path.characters());
set_option(CURLOPT_ACCEPT_ENCODING, "gzip, deflate, br");
set_option(CURLOPT_URL, url.to_string().value().to_byte_string().characters());
set_option(CURLOPT_PORT, url.port_or_default());
set_option(CURLOPT_CONNECTTIMEOUT, s_connect_timeout_seconds);
bool did_set_body = false;
if (method == "GET"sv) {
set_option(CURLOPT_HTTPGET, 1L);
} else if (method.is_one_of("POST"sv, "PUT"sv, "PATCH"sv, "DELETE"sv)) {
request->body = request_body;
set_option(CURLOPT_POSTFIELDSIZE, request->body.size());
set_option(CURLOPT_POSTFIELDS, request->body.data());
did_set_body = true;
} else if (method == "HEAD") {
set_option(CURLOPT_NOBODY, 1L);
}
set_option(CURLOPT_CUSTOMREQUEST, method.characters());
set_option(CURLOPT_FOLLOWLOCATION, 0);
struct curl_slist* curl_headers = nullptr;
// NOTE: CURLOPT_POSTFIELDS automatically sets the Content-Type header.
// Set it to empty if the headers passed in don't contain a content type.
if (did_set_body && !request_headers.contains("Content-Type"))
curl_headers = curl_slist_append(curl_headers, "Content-Type:");
for (auto const& header : request_headers.headers()) {
auto header_string = ByteString::formatted("{}: {}", header.name, header.value);
curl_headers = curl_slist_append(curl_headers, header_string.characters());
}
set_option(CURLOPT_HTTPHEADER, curl_headers);
// FIXME: Set up proxy if applicable
(void)proxy_data;
set_option(CURLOPT_WRITEFUNCTION, &on_data_received);
set_option(CURLOPT_WRITEDATA, reinterpret_cast<void*>(request.ptr()));
set_option(CURLOPT_HEADERFUNCTION, &on_header_received);
set_option(CURLOPT_HEADERDATA, reinterpret_cast<void*>(request.ptr()));
StringBuilder resolve_opt_builder;
resolve_opt_builder.appendff("{}:{}:", host, url.port_or_default());
auto first = true;
for (auto& addr : dns_result->cached_addresses()) {
auto formatted_address = addr.visit(
[&](IPv4Address const& ipv4) { return ipv4.to_byte_string(); },
[&](IPv6Address const& ipv6) { return MUST(ipv6.to_string()).to_byte_string(); });
if (!first)
resolve_opt_builder.append(',');
first = false;
resolve_opt_builder.append(formatted_address);
}
auto formatted_address = resolve_opt_builder.to_byte_string();
g_dns_cache.set(host, formatted_address);
curl_slist* resolve_list = curl_slist_append(nullptr, formatted_address.characters());
curl_easy_setopt(easy, CURLOPT_RESOLVE, resolve_list);
auto result = curl_multi_add_handle(m_curl_multi, easy);
VERIFY(result == CURLM_OK);
m_active_requests.set(request_id, move(request));
}
static Requests::NetworkError map_curl_code_to_network_error(CURLcode const& code)
{
switch (code) {
case CURLE_COULDNT_RESOLVE_HOST:
return Requests::NetworkError::UnableToResolveHost;
case CURLE_COULDNT_RESOLVE_PROXY:
return Requests::NetworkError::UnableToResolveProxy;
case CURLE_COULDNT_CONNECT:
return Requests::NetworkError::UnableToConnect;
case CURLE_OPERATION_TIMEDOUT:
return Requests::NetworkError::TimeoutReached;
case CURLE_TOO_MANY_REDIRECTS:
return Requests::NetworkError::TooManyRedirects;
case CURLE_SSL_CONNECT_ERROR:
return Requests::NetworkError::SSLHandshakeFailed;
case CURLE_PEER_FAILED_VERIFICATION:
return Requests::NetworkError::SSLVerificationFailed;
case CURLE_URL_MALFORMAT:
return Requests::NetworkError::MalformedUrl;
default:
return Requests::NetworkError::Unknown;
}
}
void ConnectionFromClient::check_active_requests()
{
int msgs_in_queue = 0;
while (auto* msg = curl_multi_info_read(m_curl_multi, &msgs_in_queue)) {
if (msg->msg != CURLMSG_DONE)
continue;
ActiveRequest* request = nullptr;
auto result = curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &request);
VERIFY(result == CURLE_OK);
if (!request->is_connect_only) {
request->flush_headers_if_needed();
auto result_code = msg->data.result;
Optional<Requests::NetworkError> network_error;
bool const request_was_successful = result_code == CURLE_OK;
if (!request_was_successful) {
network_error = map_curl_code_to_network_error(result_code);
if (network_error.has_value() && network_error.value() == Requests::NetworkError::Unknown) {
char const* curl_error_message = curl_easy_strerror(result_code);
dbgln("ConnectionFromClient: Unable to map error ({}), message: \"\033[31;1m{}\033[0m\"", static_cast<int>(result_code), curl_error_message);
}
}
async_request_finished(request->request_id, request->downloaded_so_far, network_error);
}
m_active_requests.remove(request->request_id);
}
}
Messages::RequestServer::StopRequestResponse ConnectionFromClient::stop_request(i32 request_id)
{
auto request = m_active_requests.take(request_id);
if (!request.has_value()) {
dbgln("StopRequest: Request ID {} not found", request_id);
return false;
}
return true;
}
void ConnectionFromClient::did_receive_headers(Badge<Request>, Request&)
{
}
void ConnectionFromClient::did_finish_request(Badge<Request>, Request&, bool)
{
}
void ConnectionFromClient::did_progress_request(Badge<Request>, Request&)
{
}
void ConnectionFromClient::did_request_certificates(Badge<Request>, Request&)
{
TODO();
}
Messages::RequestServer::SetCertificateResponse ConnectionFromClient::set_certificate(i32 request_id, ByteString const& certificate, ByteString const& key)
{
(void)request_id;
(void)certificate;
(void)key;
TODO();
}
void ConnectionFromClient::ensure_connection(URL::URL const& url, ::RequestServer::CacheLevel const& cache_level)
{
if (!url.is_valid()) {
dbgln("EnsureConnection: Invalid URL requested: '{}'", url);
return;
}
auto const url_string_value = url.to_string().value();
if (cache_level == CacheLevel::CreateConnection) {
auto* easy = curl_easy_init();
if (!easy) {
dbgln("EnsureConnection: Failed to initialize curl easy handle");
return;
}
auto set_option = [easy](auto option, auto value) {
auto result = curl_easy_setopt(easy, option, value);
if (result != CURLE_OK) {
dbgln("EnsureConnection: Failed to set curl option: {}", curl_easy_strerror(result));
return false;
}
return true;
};
auto connect_only_request_id = get_random<i32>();
auto request = make<ActiveRequest>(*this, m_curl_multi, easy, connect_only_request_id, 0);
request->url = url_string_value;
request->is_connect_only = true;
set_option(CURLOPT_PRIVATE, request.ptr());
set_option(CURLOPT_URL, url_string_value.to_byte_string().characters());
set_option(CURLOPT_PORT, url.port_or_default());
set_option(CURLOPT_CONNECTTIMEOUT, s_connect_timeout_seconds);
set_option(CURLOPT_CONNECT_ONLY, 1L);
auto const result = curl_multi_add_handle(m_curl_multi, easy);
VERIFY(result == CURLM_OK);
m_active_requests.set(connect_only_request_id, move(request));
return;
}
if (cache_level == CacheLevel::ResolveOnly) {
[[maybe_unused]] auto promise = m_resolver->dns.lookup(url.serialized_host().value().to_byte_string(), DNS::Messages::Class::IN, Array { DNS::Messages::ResourceType::A, DNS::Messages::ResourceType::AAAA }.span());
if constexpr (REQUESTSERVER_DEBUG) {
Core::ElapsedTimer timer;
timer.start();
promise->when_resolved([url, timer](auto const& results) -> ErrorOr<void> {
dbgln("ensure_connection::ResolveOnly({}) OK {} entrie(s) in {}ms", url, results->cached_addresses().size(), timer.elapsed());
return {};
});
promise->when_rejected([url](auto const&) { dbgln("ensure_connection::ResolveOnly({}) rejected", url); });
}
}
}
void ConnectionFromClient::websocket_connect(i64 websocket_id, URL::URL const& url, ByteString const& origin, Vector<ByteString> const& protocols, Vector<ByteString> const& extensions, HTTP::HeaderMap const& additional_request_headers)
{
if (!url.is_valid()) {
dbgln("WebSocket::Connect: Invalid URL requested: '{}'", url);
return;
}
WebSocket::ConnectionInfo connection_info(url);
connection_info.set_origin(origin);
connection_info.set_protocols(protocols);
connection_info.set_extensions(extensions);
connection_info.set_headers(additional_request_headers);
auto connection = WebSocket::WebSocket::create(move(connection_info));
connection->on_open = [this, websocket_id]() {
async_websocket_connected(websocket_id);
};
connection->on_message = [this, websocket_id](auto message) {
async_websocket_received(websocket_id, message.is_text(), message.data());
};
connection->on_error = [this, websocket_id](auto message) {
async_websocket_errored(websocket_id, (i32)message);
};
connection->on_close = [this, websocket_id](u16 code, ByteString reason, bool was_clean) {
async_websocket_closed(websocket_id, code, move(reason), was_clean);
};
connection->on_ready_state_change = [this, websocket_id](auto state) {
async_websocket_ready_state_changed(websocket_id, (u32)state);
};
connection->start();
m_websockets.set(websocket_id, move(connection));
}
void ConnectionFromClient::websocket_send(i64 websocket_id, bool is_text, ByteBuffer const& data)
{
if (auto connection = m_websockets.get(websocket_id).value_or({}); connection && connection->ready_state() == WebSocket::ReadyState::Open)
connection->send(WebSocket::Message { data, is_text });
}
void ConnectionFromClient::websocket_close(i64 websocket_id, u16 code, ByteString const& reason)
{
if (auto connection = m_websockets.get(websocket_id).value_or({}); connection && connection->ready_state() == WebSocket::ReadyState::Open)
connection->close(code, reason);
}
Messages::RequestServer::WebsocketSetCertificateResponse ConnectionFromClient::websocket_set_certificate(i64 websocket_id, ByteString const&, ByteString const&)
{
auto success = false;
if (auto connection = m_websockets.get(websocket_id).value_or({}); connection) {
// NO OP here
// connection->set_certificate(certificate, key);
success = true;
}
return success;
}
}
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