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// Copyright 2015 The Chromium 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 <utility>
#include "base/bind.h"
#include "base/memory/scoped_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/common/chrome_switches.h"
#include "chrome/test/base/ui_test_utils.h"
#include "extensions/browser/extension_throttle_manager.h"
#include "extensions/test/result_catcher.h"
#include "net/base/backoff_entry.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 {
scoped_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)) {
scoped_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)) {
scoped_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 scoped_ptr<net::test_server::BasicHttpResponse>();
}
} // namespace
class ExtensionRequestLimitingThrottleBrowserTest
: public ExtensionBrowserTest {
public:
void SetUpOnMainThread() override {
ExtensionBrowserTest::SetUpOnMainThread();
ProfileIOData* io_data =
ProfileIOData::FromResourceContext(profile()->GetResourceContext());
ExtensionThrottleManager* manager = io_data->GetExtensionThrottleManager();
if (manager) {
// Requests issued within within |kUserGestureWindowMs| of a user gesture
// are also considered as user gestures (see
// resource_dispatcher_host_impl.cc), so these tests need to bypass the
// checking of the net::LOAD_MAYBE_USER_GESTURE load flag in the manager
// in order to test the throttling logic.
manager->SetIgnoreUserGestureLoadFlagForTests(true);
scoped_ptr<
net::BackoffEntry::Policy> policy(new net::BackoffEntry::Policy{
// Number of initial errors (in sequence) to ignore before applying
// exponential back-off rules.
1,
// Initial delay for exponential back-off in ms.
10 * 60 * 1000,
// Factor by which the waiting time will be multiplied.
10,
// Fuzzing percentage. ex: 10% will spread requests randomly
// between 90%-100% of the calculated time.
0.1,
// Maximum amount of time we are willing to delay our request in ms.
15 * 60 * 1000,
// Time to keep an entry from being discarded even when it
// has no significant state, -1 to never discard.
-1,
// Don't use initial delay unless the last request was an error.
false,
});
manager->SetBackoffPolicyForTests(std::move(policy));
}
// 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");
ASSERT_TRUE(embedded_test_server()->Start());
extension_ =
LoadExtension(test_data_dir_.AppendASCII("extension_throttle"));
ASSERT_TRUE(extension_);
}
void RunTest(const std::string& file_path, const std::string& request_url) {
ResultCatcher catcher;
GURL test_url = net::AppendQueryParameter(
extension_->GetResourceURL(file_path), "url", request_url);
ui_test_utils::NavigateToURL(browser(), test_url);
ASSERT_TRUE(catcher.GetNextResult());
}
private:
const Extension* extension_;
};
class ExtensionRequestLimitingThrottleCommandLineBrowserTest
: public ExtensionRequestLimitingThrottleBrowserTest {
public:
void SetUpCommandLine(base::CommandLine* command_line) override {
ExtensionRequestLimitingThrottleBrowserTest::SetUpCommandLine(command_line);
command_line->AppendSwitch(switches::kDisableExtensionsHttpThrottling);
}
};
// Tests that if the same URL is requested repeatedly by an extension, it will
// eventually be throttled.
IN_PROC_BROWSER_TEST_F(ExtensionRequestLimitingThrottleBrowserTest,
ThrottleRequest) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, false, false));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_eventually_throttled.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port())));
}
// 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_F(ExtensionRequestLimitingThrottleBrowserTest,
DoNotThrottleCachedResponse) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, false, true));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_not_throttled.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_F(ExtensionRequestLimitingThrottleBrowserTest,
ThrottleRequest_Redirect) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, false, false));
// 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_eventually_throttled.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port())));
// Now requests to both URLs should be throttled. Explicitly validate that the
// second URL is throttled.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttled_on_first_try.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port())));
}
// 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_F(ExtensionRequestLimitingThrottleBrowserTest,
DoNotThrottleCachedResponse_Redirect) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, true, true));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_not_throttled.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_F(ExtensionRequestLimitingThrottleBrowserTest,
ThrottleRequest_RedirectCached) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, true, false));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_eventually_throttled.html",
base::StringPrintf("http://www.example.com:%d/redirect",
embedded_test_server()->port())));
// Explicitly validate that the second URL is throttled.
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_throttled_on_first_try.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port())));
}
// 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_F(ExtensionRequestLimitingThrottleBrowserTest,
DoNotThrottleCachedResponse_NonRedirectCached) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, false, true));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_not_throttled.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_not_throttled.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port())));
}
// Tests that if switches::kDisableExtensionsHttpThrottling is set on the
// command line, throttling is disabled.
IN_PROC_BROWSER_TEST_F(ExtensionRequestLimitingThrottleCommandLineBrowserTest,
ThrottleRequestDisabled) {
embedded_test_server()->RegisterRequestHandler(
base::Bind(&HandleRequest, false, false));
ASSERT_NO_FATAL_FAILURE(
RunTest("test_request_not_throttled.html",
base::StringPrintf("http://www.example.com:%d/test_throttle",
embedded_test_server()->port())));
}
} // namespace extensions
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