| // 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/sparse_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/redirect_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_BLOCK_MANUAL, |
| FILTERING_BEHAVIOR_BLOCK_DEFAULT, |
| FILTERING_BEHAVIOR_MAX = FILTERING_BEHAVIOR_BLOCK_DEFAULT |
| }; |
| const int kHistogramFilteringBehaviorSpacing = 100; |
| const int kHistogramPageTransitionMaxKnownValue = |
| static_cast<int>(ui::PAGE_TRANSITION_KEYWORD_GENERATED); |
| const int kHistogramPageTransitionFallbackValue = |
| kHistogramFilteringBehaviorSpacing - 1; |
| const int kHistogramMax = 700; |
| |
| 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) { |
| switch (behavior) { |
| case SupervisedUserURLFilter::ALLOW: |
| case SupervisedUserURLFilter::WARN: |
| return uncertain ? FILTERING_BEHAVIOR_ALLOW_UNCERTAIN |
| : FILTERING_BEHAVIOR_ALLOW; |
| case SupervisedUserURLFilter::BLOCK: |
| switch (reason) { |
| case SupervisedUserURLFilter::BLACKLIST: |
| return FILTERING_BEHAVIOR_BLOCK_BLACKLIST; |
| case SupervisedUserURLFilter::ASYNC_CHECKER: |
| return FILTERING_BEHAVIOR_BLOCK_SAFESITES; |
| case SupervisedUserURLFilter::WHITELIST: |
| NOTREACHED(); |
| break; |
| case SupervisedUserURLFilter::MANUAL: |
| return FILTERING_BEHAVIOR_BLOCK_MANUAL; |
| case SupervisedUserURLFilter::DEFAULT: |
| return FILTERING_BEHAVIOR_BLOCK_DEFAULT; |
| } |
| case SupervisedUserURLFilter::INVALID: |
| 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( |
| bool safesites_histogram, |
| SupervisedUserURLFilter::FilteringBehavior behavior, |
| SupervisedUserURLFilter::FilteringBehaviorReason reason, |
| bool uncertain, |
| ui::PageTransition transition_type) { |
| int value = |
| GetHistogramValueForFilteringBehavior(behavior, reason, uncertain) * |
| kHistogramFilteringBehaviorSpacing + |
| GetHistogramValueForTransitionType(transition_type); |
| DCHECK_LT(value, kHistogramMax); |
| // Note: We can't pass in the histogram name as a parameter to this function |
| // because of how the macro works (look up the histogram on the first |
| // invocation and cache it in a static variable). |
| if (safesites_histogram) |
| UMA_HISTOGRAM_SPARSE_SLOWLY("ManagedUsers.SafetyFilter", value); |
| else |
| UMA_HISTOGRAM_SPARSE_SLOWLY("ManagedUsers.FilteringResult", value); |
| } |
| |
| } // 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::INVALID), |
| 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::INVALID, behavior_); |
| bool got_result = url_filter_->GetFilteringBehaviorForURLWithAsyncChecks( |
| url, |
| base::Bind(&SupervisedUserResourceThrottle::OnCheckDone, |
| weak_ptr_factory_.GetWeakPtr(), url)); |
| DCHECK_EQ(got_result, behavior_ != SupervisedUserURLFilter::INVALID); |
| // If we got a "not blocked" result synchronously, don't defer. |
| *defer = deferred_ = !got_result || |
| (behavior_ == SupervisedUserURLFilter::BLOCK); |
| if (got_result) |
| behavior_ = SupervisedUserURLFilter::INVALID; |
| } |
| |
| 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->GetWebContentsGetterForRequest(), url, reason, |
| base::Bind(&SupervisedUserResourceThrottle::OnInterstitialResult, |
| weak_ptr_factory_.GetWeakPtr()))); |
| } |
| |
| void SupervisedUserResourceThrottle::WillStartRequest(bool* defer) { |
| ShowInterstitialIfNeeded(false, request_->url(), defer); |
| } |
| |
| void SupervisedUserResourceThrottle::WillRedirectRequest( |
| const net::RedirectInfo& redirect_info, |
| bool* defer) { |
| ShowInterstitialIfNeeded(true, redirect_info.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::INVALID, behavior_); |
| // If we got a result synchronously, pass it back to ShowInterstitialIfNeeded. |
| if (!deferred_) |
| behavior_ = behavior; |
| |
| ui::PageTransition transition = |
| content::ResourceRequestInfo::ForRequest(request_)->GetPageTransition(); |
| |
| RecordFilterResultEvent(false, behavior, reason, uncertain, transition); |
| |
| // If both the static blacklist and the async checker are enabled, also record |
| // SafeSites-only UMA events. |
| if (url_filter_->HasBlacklist() && url_filter_->HasAsyncURLChecker() && |
| (reason == SupervisedUserURLFilter::ASYNC_CHECKER || |
| reason == SupervisedUserURLFilter::BLACKLIST)) { |
| RecordFilterResultEvent(true, behavior, reason, uncertain, transition); |
| } |
| |
| 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(); |
| } |