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// Copyright 2014 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 "chrome/browser/supervised_user/supervised_user_resource_throttle.h"
#include "base/bind.h"
#include "base/metrics/histogram.h"
#include "chrome/browser/supervised_user/supervised_user_interstitial.h"
#include "chrome/browser/supervised_user/supervised_user_navigation_observer.h"
#include "chrome/browser/supervised_user/supervised_user_url_filter.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/resource_controller.h"
#include "content/public/browser/resource_request_info.h"
#include "net/url_request/url_request.h"
#include "ui/base/page_transition_types.h"
using content::BrowserThread;
namespace {
// These values corresponds to SupervisedUserSafetyFilterResult in
// tools/metrics/histograms/histograms.xml. If you change anything here, make
// sure to also update histograms.xml accordingly.
enum {
FILTERING_BEHAVIOR_ALLOW = 1,
FILTERING_BEHAVIOR_ALLOW_UNCERTAIN,
FILTERING_BEHAVIOR_BLOCK_BLACKLIST,
FILTERING_BEHAVIOR_BLOCK_SAFESITES,
FILTERING_BEHAVIOR_MAX = FILTERING_BEHAVIOR_BLOCK_SAFESITES
};
const int kHistogramFilteringBehaviorSpacing = 100;
const int kHistogramPageTransitionMaxKnownValue =
static_cast<int>(ui::PAGE_TRANSITION_KEYWORD_GENERATED);
const int kHistogramPageTransitionFallbackValue =
kHistogramFilteringBehaviorSpacing - 1;
const int kHistogramMax = 500;
static_assert(kHistogramPageTransitionMaxKnownValue <
kHistogramPageTransitionFallbackValue,
"HistogramPageTransition MaxKnownValue must be < FallbackValue");
static_assert(FILTERING_BEHAVIOR_MAX * kHistogramFilteringBehaviorSpacing +
kHistogramPageTransitionFallbackValue < kHistogramMax,
"Invalid HistogramMax value");
int GetHistogramValueForFilteringBehavior(
SupervisedUserURLFilter::FilteringBehavior behavior,
SupervisedUserURLFilter::FilteringBehaviorReason reason,
bool uncertain) {
// Since we're only interested in statistics about the blacklist and
// SafeSites, count everything that got through to the default fallback
// behavior as ALLOW (made it through all the filters!).
if (reason == SupervisedUserURLFilter::DEFAULT)
behavior = SupervisedUserURLFilter::ALLOW;
switch (behavior) {
case SupervisedUserURLFilter::ALLOW:
return uncertain ? FILTERING_BEHAVIOR_ALLOW_UNCERTAIN
: FILTERING_BEHAVIOR_ALLOW;
case SupervisedUserURLFilter::BLOCK:
if (reason == SupervisedUserURLFilter::BLACKLIST)
return FILTERING_BEHAVIOR_BLOCK_BLACKLIST;
else if (reason == SupervisedUserURLFilter::ASYNC_CHECKER)
return FILTERING_BEHAVIOR_BLOCK_SAFESITES;
// Fall through.
default:
NOTREACHED();
}
return 0;
}
int GetHistogramValueForTransitionType(ui::PageTransition transition_type) {
int value =
static_cast<int>(ui::PageTransitionStripQualifier(transition_type));
if (0 <= value && value <= kHistogramPageTransitionMaxKnownValue)
return value;
NOTREACHED();
return kHistogramPageTransitionFallbackValue;
}
void RecordFilterResultEvent(
SupervisedUserURLFilter::FilteringBehavior behavior,
SupervisedUserURLFilter::FilteringBehaviorReason reason,
bool uncertain,
ui::PageTransition transition_type) {
DCHECK(reason != SupervisedUserURLFilter::MANUAL);
int value =
GetHistogramValueForFilteringBehavior(behavior, reason, uncertain) *
kHistogramFilteringBehaviorSpacing +
GetHistogramValueForTransitionType(transition_type);
DCHECK_LT(value, kHistogramMax);
UMA_HISTOGRAM_ENUMERATION("ManagedUsers.SafetyFilter",
value, kHistogramMax);
}
} // namespace
SupervisedUserResourceThrottle::SupervisedUserResourceThrottle(
const net::URLRequest* request,
bool is_main_frame,
const SupervisedUserURLFilter* url_filter)
: request_(request),
is_main_frame_(is_main_frame),
url_filter_(url_filter),
deferred_(false),
behavior_(SupervisedUserURLFilter::HISTOGRAM_BOUNDING_VALUE),
weak_ptr_factory_(this) {}
SupervisedUserResourceThrottle::~SupervisedUserResourceThrottle() {}
void SupervisedUserResourceThrottle::ShowInterstitialIfNeeded(bool is_redirect,
const GURL& url,
bool* defer) {
// Only treat main frame requests for now (ignoring subresources).
if (!is_main_frame_)
return;
deferred_ = false;
DCHECK_EQ(SupervisedUserURLFilter::HISTOGRAM_BOUNDING_VALUE, behavior_);
bool got_result = url_filter_->GetFilteringBehaviorForURLWithAsyncChecks(
url,
base::Bind(&SupervisedUserResourceThrottle::OnCheckDone,
weak_ptr_factory_.GetWeakPtr(), url));
DCHECK_EQ(got_result,
(behavior_ != SupervisedUserURLFilter::HISTOGRAM_BOUNDING_VALUE));
// If we got a "not blocked" result synchronously, don't defer.
*defer = deferred_ = !got_result ||
(behavior_ == SupervisedUserURLFilter::BLOCK);
if (got_result)
behavior_ = SupervisedUserURLFilter::HISTOGRAM_BOUNDING_VALUE;
}
void SupervisedUserResourceThrottle::ShowInterstitial(
const GURL& url,
SupervisedUserURLFilter::FilteringBehaviorReason reason) {
const content::ResourceRequestInfo* info =
content::ResourceRequestInfo::ForRequest(request_);
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&SupervisedUserNavigationObserver::OnRequestBlocked,
info->GetChildID(), info->GetRouteID(), url, reason,
base::Bind(
&SupervisedUserResourceThrottle::OnInterstitialResult,
weak_ptr_factory_.GetWeakPtr())));
}
void SupervisedUserResourceThrottle::WillStartRequest(bool* defer) {
ShowInterstitialIfNeeded(false, request_->url(), defer);
}
void SupervisedUserResourceThrottle::WillRedirectRequest(const GURL& new_url,
bool* defer) {
ShowInterstitialIfNeeded(true, new_url, defer);
}
const char* SupervisedUserResourceThrottle::GetNameForLogging() const {
return "SupervisedUserResourceThrottle";
}
void SupervisedUserResourceThrottle::OnCheckDone(
const GURL& url,
SupervisedUserURLFilter::FilteringBehavior behavior,
SupervisedUserURLFilter::FilteringBehaviorReason reason,
bool uncertain) {
DCHECK_EQ(SupervisedUserURLFilter::HISTOGRAM_BOUNDING_VALUE, behavior_);
// If we got a result synchronously, pass it back to ShowInterstitialIfNeeded.
if (!deferred_)
behavior_ = behavior;
// If both the static blacklist and SafeSites are enabled, record UMA events.
if (url_filter_->HasBlacklist() && url_filter_->HasAsyncURLChecker() &&
reason < SupervisedUserURLFilter::MANUAL) {
const content::ResourceRequestInfo* info =
content::ResourceRequestInfo::ForRequest(request_);
RecordFilterResultEvent(behavior, reason, uncertain,
info->GetPageTransition());
}
if (behavior == SupervisedUserURLFilter::BLOCK)
ShowInterstitial(url, reason);
else if (deferred_)
controller()->Resume();
}
void SupervisedUserResourceThrottle::OnInterstitialResult(
bool continue_request) {
if (continue_request)
controller()->Resume();
else
controller()->Cancel();
}
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