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// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <brillo/http/http_proxy.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include <base/bind.h>
#include <base/callback.h>
#include <base/logging.h>
#include <base/strings/string_tokenizer.h>
#include <base/strings/string_util.h>
#include <brillo/http/http_transport.h>
#include <chromeos/dbus/service_constants.h>
#include <dbus/bus.h>
#include <dbus/message.h>
#include <dbus/object_proxy.h>
namespace {
bool ParseProxyInfo(dbus::Response* response,
std::vector<std::string>* proxies_out) {
DCHECK(proxies_out);
if (!response) {
LOG(ERROR) << chromeos::kNetworkProxyServiceName << " D-Bus call to "
<< chromeos::kNetworkProxyServiceResolveProxyMethod
<< " failed";
proxies_out->assign({brillo::http::kDirectProxy});
return false;
}
dbus::MessageReader reader(response);
std::string proxy_info;
std::string proxy_err;
if (!reader.PopString(&proxy_info) || !reader.PopString(&proxy_err)) {
LOG(ERROR) << chromeos::kNetworkProxyServiceName << " D-Bus call to "
<< chromeos::kNetworkProxyServiceResolveProxyMethod
<< " returned an invalid D-Bus response";
proxies_out->assign({brillo::http::kDirectProxy});
return false;
}
if (!proxy_err.empty()) {
// This case occurs when on the Chrome side of things it can't connect to
// the proxy resolver service, we just let this fall through and will end
// up returning success with only the direct proxy listed.
LOG(WARNING) << "Got error resolving proxy: " << proxy_err;
}
base::StringTokenizer toker(proxy_info, ";");
while (toker.GetNext()) {
std::string token = toker.token();
base::TrimWhitespaceASCII(token, base::TRIM_ALL, &token);
// Start by finding the first space (if any).
std::string::iterator space;
for (space = ++token.begin(); space != token.end(); ++space) {
if (base::IsAsciiWhitespace(*space)) {
break;
}
}
std::string scheme = base::ToLowerASCII(std::string(token.begin(), space));
// Chrome uses "socks" to mean socks4 and "proxy" to mean http.
if (scheme == "socks") {
scheme += "4";
} else if (scheme == "proxy") {
scheme = "http";
} else if (scheme != "https" && scheme != "socks4" && scheme != "socks5" &&
scheme != "direct") {
LOG(ERROR) << "Invalid proxy scheme found of: " << scheme;
continue;
}
std::string host_and_port = std::string(space, token.end());
base::TrimWhitespaceASCII(host_and_port, base::TRIM_ALL, &host_and_port);
if (scheme != "direct" && host_and_port.empty()) {
LOG(ERROR) << "Invalid host/port information for proxy: " << token;
continue;
}
proxies_out->push_back(scheme + "://" + host_and_port);
}
// Always add the direct proxy (i.e. no proxy) as a last resort if not there.
if (proxies_out->empty() ||
proxies_out->back() != brillo::http::kDirectProxy) {
proxies_out->push_back(brillo::http::kDirectProxy);
}
return true;
}
void OnResolveProxy(const brillo::http::GetChromeProxyServersCallback& callback,
dbus::Response* response) {
std::vector<std::string> proxies;
bool result = ParseProxyInfo(response, &proxies);
callback.Run(result, std::move(proxies));
}
} // namespace
namespace brillo {
namespace http {
bool GetChromeProxyServers(scoped_refptr<dbus::Bus> bus, const std::string& url,
std::vector<std::string>* proxies_out) {
dbus::ObjectProxy* proxy =
bus->GetObjectProxy(chromeos::kNetworkProxyServiceName,
dbus::ObjectPath(chromeos::kNetworkProxyServicePath));
dbus::MethodCall method_call(
chromeos::kNetworkProxyServiceInterface,
chromeos::kNetworkProxyServiceResolveProxyMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(url);
std::unique_ptr<dbus::Response> response = proxy->CallMethodAndBlock(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT);
return ParseProxyInfo(response.get(), proxies_out);
}
void GetChromeProxyServersAsync(scoped_refptr<dbus::Bus> bus,
const std::string& url,
const GetChromeProxyServersCallback& callback) {
dbus::ObjectProxy* proxy = bus->GetObjectProxy(
chromeos::kNetworkProxyServiceName,
dbus::ObjectPath(chromeos::kNetworkProxyServicePath));
dbus::MethodCall method_call(
chromeos::kNetworkProxyServiceInterface,
chromeos::kNetworkProxyServiceResolveProxyMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(url);
proxy->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&OnResolveProxy, callback));
}
} // namespace http
} // namespace brillo
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