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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/extensions/extension_browsertest.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/public/common/content_switches.h"
#include "content/public/test/browser_test.h"
#include "extensions/common/switches.h"
#include "extensions/test/result_catcher.h"
#include "net/base/backoff_entry.h"
#include "net/base/features.h"
#include "net/base/url_util.h"
#include "net/dns/mock_host_resolver.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "net/test/embedded_test_server/http_request.h"
#include "net/test/embedded_test_server/http_response.h"
namespace extensions {
namespace {
std::unique_ptr<net::test_server::HttpResponse> HandleRequest(
bool set_cache_header_redirect_page,
bool set_cache_header_test_throttle_page,
const net::test_server::HttpRequest& request) {
if (base::StartsWith(request.relative_url, "/redirect",
base::CompareCase::SENSITIVE)) {
std::unique_ptr<net::test_server::BasicHttpResponse> http_response(
new net::test_server::BasicHttpResponse());
http_response->set_code(net::HTTP_FOUND);
http_response->set_content("Redirecting...");
http_response->set_content_type("text/plain");
http_response->AddCustomHeader("Location", "/test_throttle");
if (set_cache_header_redirect_page)
http_response->AddCustomHeader("Cache-Control", "max-age=3600");
return std::move(http_response);
}
if (base::StartsWith(request.relative_url, "/test_throttle",
base::CompareCase::SENSITIVE)) {
std::unique_ptr<net::test_server::BasicHttpResponse> http_response(
new net::test_server::BasicHttpResponse());
http_response->set_code(net::HTTP_SERVICE_UNAVAILABLE);
http_response->set_content("The server is overloaded right now.");
http_response->set_content_type("text/plain");
if (set_cache_header_test_throttle_page)
http_response->AddCustomHeader("Cache-Control", "max-age=3600");
return std::move(http_response);
}
// Unhandled requests result in the Embedded test server sending a 404.
return nullptr;
}
} // namespace
class ExtensionURLLoaderThrottleBrowserTest : public ExtensionBrowserTest {
public:
void SetUpCommandLine(base::CommandLine* command_line) override {
ExtensionBrowserTest::SetUpCommandLine(command_line);
command_line->AppendSwitch(
extensions::switches::kSetExtensionThrottleTestParams);
}
void SetUpOnMainThread() override {
ExtensionBrowserTest::SetUpOnMainThread();
// Requests to 127.0.0.1 bypass throttling, so set up a host resolver rule
// to use a fake domain.
host_resolver()->AddRule("www.example.com", "127.0.0.1");
extension_ =
LoadExtension(test_data_dir_.AppendASCII("extension_throttle"));
ASSERT_TRUE(extension_);
}
void RunTest(const std::string& file_path,
const std::string& request_url,
const std::string& expected_throttled_request_num) {
ResultCatcher catcher;
const GURL unthrottled_test_url = net::AppendQueryParameter(
extension_->ResolveExtensionURL(file_path), "url", request_url);
const GURL test_url =
expected_throttled_request_num.empty()
? unthrottled_test_url
: net::AppendQueryParameter(unthrottled_test_url,
"expectedFailRequestNum",
expected_throttled_request_num);
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url));
ASSERT_TRUE(catcher.GetNextResult());
}
private:
raw_ptr<const Extension, DanglingUntriaged> extension_;
};
class ExtensionURLLoaderThrottleWithSplitCacheBrowserTest
: public ExtensionURLLoaderThrottleBrowserTest,
public ::testing::WithParamInterface<bool> {
public:
void SetUp() override {
bool split_cache_by_network_isolation_key = GetParam();
feature_list_.InitWithFeatureState(
net::features::kSplitCacheByNetworkIsolationKey,
split_cache_by_network_isolation_key);
ExtensionURLLoaderThrottleBrowserTest::SetUp();
}
private:
base::test::ScopedFeatureList feature_list_;
};
// Tests that if the same URL is requested repeatedly by an extension, it will
// eventually be throttled.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
ThrottleRequest) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, false, false));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
"3"));
}
// Tests that if the same URL is repeatedly requested by an extension, and the
// response is served from the cache, it will not be throttled.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
DoNotThrottleCachedResponse) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, false, true));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
""));
}
// Tests that the redirected request is also being throttled.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
ThrottleRequest_Redirect) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, false, false));
ASSERT_TRUE(embedded_test_server()->Start());
// Issue a bunch of requests to a url which gets redirected to a new url that
// generates 503.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port()),
"3"));
// Now requests to both URLs should be throttled. Explicitly validate that the
// second URL is throttled.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
"1"));
}
// Tests that if both redirect (302) and non-redirect (503) responses are
// served from cache, the extension throttle does not throttle the request.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
DoNotThrottleCachedResponse_Redirect) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, true, true));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port()),
""));
}
// Tests that if the redirect (302) is served from cache, but the non-redirect
// (503) is not, the extension throttle throttles the requests for the second
// url.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
ThrottleRequest_RedirectCached) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, true, false));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port()),
"3"));
// Explicitly validate that the second URL is throttled.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
"1"));
}
// Tests that if the redirect (302) is not served from cache, but the
// non-redirect (503) is, the extension throttle only throttles requests to the
// redirect URL.
IN_PROC_BROWSER_TEST_P(ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
DoNotThrottleCachedResponse_NonRedirectCached) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, false, true));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port()),
""));
// Explicitly validate that the second URL is not throttled.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
""));
}
INSTANTIATE_TEST_SUITE_P(
All,
ExtensionURLLoaderThrottleWithSplitCacheBrowserTest,
testing::Bool());
class ExtensionURLLoaderThrottleCommandLineBrowserTest
: public ExtensionURLLoaderThrottleBrowserTest {
public:
void SetUpCommandLine(base::CommandLine* command_line) override {
ExtensionURLLoaderThrottleBrowserTest::SetUpCommandLine(command_line);
command_line->AppendSwitch(
extensions::switches::kDisableExtensionsHttpThrottling);
}
};
// Tests that if switches::kDisableExtensionsHttpThrottling is set on the
// command line, throttling is disabled.
IN_PROC_BROWSER_TEST_F(ExtensionURLLoaderThrottleCommandLineBrowserTest,
ThrottleRequestDisabled) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&HandleRequest, false, false));
ASSERT_TRUE(embedded_test_server()->Start());
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttle.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port()),
""));
}
} // namespace extensions
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