Create a browser feature extractor that runs after the renderer has

chrome/browser/safe_browsing/browser_feature_extractor.cc

+// Copyright (c) 2011 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/safe_browsing/browser_feature_extractor.h"
+
+#include <map>
+#include <utility>
+
+#include "base/stl_util-inl.h"
+#include "base/task.h"
+#include "base/time.h"
+#include "chrome/common/safe_browsing/csd.pb.h"
+#include "chrome/browser/history/history.h"
+#include "chrome/browser/history/history_types.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/common/page_transition_types.h"
+#include "content/browser/browser_thread.h"
+#include "content/browser/cancelable_request.h"
+#include "content/browser/tab_contents/tab_contents.h"
+#include "googleurl/src/gurl.h"
+
+namespace safe_browsing {
+namespace features {
+const char kUrlHistoryVisitCount[] = "UrlHistoryVisitCount";
+const char kUrlHistoryTypedCount[] = "UrlHistoryTypedCount";
+const char kUrlHistoryLinkCount[] = "UrlHistoryLinkCount";
+const char kUrlHistoryVisitCountMoreThan24hAgo[] =
+    "UrlHistoryVisitCountMoreThan24hAgo";
+const char kHttpHostVisitCount[] = "HttpHostVisitCount";
+const char kHttpsHostVisitCount[] = "HttpsHostVisitCount";
+const char kFirstHttpHostVisitMoreThan24hAgo[] =
+    "FirstHttpHostVisitMoreThan24hAgo";
+const char kFirstHttpsHostVisitMoreThan24hAgo[] =
+    "FirstHttpsHostVisitMoreThan24hAgo";
+}  // namespace features
+
+static void AddFeature(const std::string& feature_name,
+                       double feature_value,
+                       ClientPhishingRequest* request) {
+  DCHECK(request);
+  ClientPhishingRequest::Feature* feature =
+      request->add_non_model_feature_map();
+  feature->set_name(feature_name);
+  feature->set_value(feature_value);
+  VLOG(2) << "Browser feature: " << feature->name() << " " << feature->value();
+}
+
+BrowserFeatureExtractor::BrowserFeatureExtractor(TabContents* tab)
+    : tab_(tab),
+      ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {
+  DCHECK(tab);
+}
+
+BrowserFeatureExtractor::~BrowserFeatureExtractor() {
+  method_factory_.RevokeAll();
+  // Delete all the pending extractions (delete callback and request objects).
+  STLDeleteContainerPairPointers(pending_extractions_.begin(),
+                                 pending_extractions_.end());
+  // Also cancel all the pending history service queries.
+  HistoryService* history;
+  bool success = GetHistoryService(&history);
+  DCHECK(success || pending_queries_.size() == 0);
+  // Cancel all the pending history lookups and cleanup the memory.
+  for (PendingQueriesMap::iterator it = pending_queries_.begin();
+       it != pending_queries_.end(); ++it) {
+    if (history) {
+      history->CancelRequest(it->first);
+    }
+    ExtractionData& extraction = it->second;
+    delete extraction.first;  // delete request
+    delete extraction.second;  // delete callback
+  }
+  pending_queries_.clear();
+}
+
+void BrowserFeatureExtractor::ExtractFeatures(ClientPhishingRequest* request,
+                                              DoneCallback* callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(request);
+  DCHECK_EQ(0U, request->url().find("http:"));
+  DCHECK(callback);
+  if (!callback) {
+    DLOG(ERROR) << "ExtractFeatures called without a callback object";
+    return;
+  }
+  pending_extractions_.insert(std::make_pair(request, callback));
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      method_factory_.NewRunnableMethod(
+          &BrowserFeatureExtractor::StartExtractFeatures,
+          request, callback));
+}
+
+void BrowserFeatureExtractor::StartExtractFeatures(
+    ClientPhishingRequest* request,
+    DoneCallback* callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  ExtractionData extraction = std::make_pair(request, callback);
+  size_t removed = pending_extractions_.erase(extraction);
+  DCHECK_EQ(1U, removed);
+  HistoryService* history;
+  if (!request || !request->IsInitialized() || !GetHistoryService(&history)) {
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  CancelableRequestProvider::Handle handle = history->QueryURL(
+      GURL(request->url()),
+      true /* wants_visits */,
+      &request_consumer_,
+      NewCallback(this,
+                  &BrowserFeatureExtractor::QueryUrlHistoryDone));
+
+  StorePendingQuery(handle, request, callback);
+}
+
+void BrowserFeatureExtractor::QueryUrlHistoryDone(
+    CancelableRequestProvider::Handle handle,
+    bool success,
+    const history::URLRow* row,
+    history::VisitVector* visits) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  ClientPhishingRequest* request;
+  DoneCallback* callback;
+  if (!GetPendingQuery(handle, &request, &callback)) {
+    DLOG(FATAL) << "No pending history query found";
+    return;
+  }
+  DCHECK(request);
+  DCHECK(callback);
+  if (!success) {
+    // URL is not found in the history.  In practice this should not
+    // happen (unless there is a real error) because we just visited
+    // that URL.
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  AddFeature(features::kUrlHistoryVisitCount,
+             static_cast<double>(row->visit_count()),
+             request);
+
+  base::Time threshold = base::Time::Now() - base::TimeDelta::FromDays(1);
+  int num_visits_24h_ago = 0;
+  int num_visits_typed = 0;
+  int num_visits_link = 0;
+  for (history::VisitVector::const_iterator it = visits->begin();
+       it != visits->end(); ++it) {
+    if (!PageTransition::IsMainFrame(it->transition)) {
+      continue;
+    }
+    if (it->visit_time < threshold) {
+      ++num_visits_24h_ago;
+    }
+    PageTransition::Type transition = PageTransition::StripQualifier(
+        it->transition);
+    if (transition == PageTransition::TYPED) {
+      ++num_visits_typed;
+    } else if (transition == PageTransition::LINK) {
+      ++num_visits_link;
+    }
+  }
+  AddFeature(features::kUrlHistoryVisitCountMoreThan24hAgo,
+             static_cast<double>(num_visits_24h_ago),
+             request);
+  AddFeature(features::kUrlHistoryTypedCount,
+             static_cast<double>(num_visits_typed),
+             request);
+  AddFeature(features::kUrlHistoryLinkCount,
+             static_cast<double>(num_visits_link),
+             request);
+
+  // Issue next history lookup for host visits.
+  HistoryService* history;
+  if (!GetHistoryService(&history)) {
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  CancelableRequestProvider::Handle next_handle =
+      history->GetVisibleVisitCountToHost(
+          GURL(request->url()),
+          &request_consumer_,
+          NewCallback(this, &BrowserFeatureExtractor::QueryHttpHostVisitsDone));
+  StorePendingQuery(next_handle, request, callback);
+}
+
+void BrowserFeatureExtractor::QueryHttpHostVisitsDone(
+    CancelableRequestProvider::Handle handle,
+    bool success,
+    int num_visits,
+    base::Time first_visit) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  ClientPhishingRequest* request;
+  DoneCallback* callback;
+  if (!GetPendingQuery(handle, &request, &callback)) {
+    DLOG(FATAL) << "No pending history query found";
+    return;
+  }
+  DCHECK(request);
+  DCHECK(callback);
+  if (!success) {
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  SetHostVisitsFeatures(num_visits, first_visit, true, request);
+
+  // Same lookup but for the HTTPS URL.
+  HistoryService* history;
+  if (!GetHistoryService(&history)) {
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  std::string https_url = request->url();
+  CancelableRequestProvider::Handle next_handle =
+      history->GetVisibleVisitCountToHost(
+          GURL(https_url.replace(0, 5, "https:")),
+          &request_consumer_,
+          NewCallback(this,
+                      &BrowserFeatureExtractor::QueryHttpsHostVisitsDone));
+  StorePendingQuery(next_handle, request, callback);
+}
+
+void BrowserFeatureExtractor::QueryHttpsHostVisitsDone(
+    CancelableRequestProvider::Handle handle,
+    bool success,
+    int num_visits,
+    base::Time first_visit) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  ClientPhishingRequest* request;
+  DoneCallback* callback;
+  if (!GetPendingQuery(handle, &request, &callback)) {
+    DLOG(FATAL) << "No pending history query found";
+    return;
+  }
+  DCHECK(request);
+  DCHECK(callback);
+  if (!success) {
+    callback->Run(false, request);
+    delete callback;
+    return;
+  }
+  SetHostVisitsFeatures(num_visits, first_visit, false, request);
+  callback->Run(true, request);  // We're done with all the history lookups.
+  delete callback;
+}
+
+void BrowserFeatureExtractor::SetHostVisitsFeatures(
+    int num_visits,
+    base::Time first_visit,
+    bool is_http_query,
+    ClientPhishingRequest* request) {
+  DCHECK(request);
+  AddFeature(is_http_query ?
+             features::kHttpHostVisitCount : features::kHttpsHostVisitCount,
+             static_cast<double>(num_visits),
+             request);
+  AddFeature(
+      is_http_query ?
+      features::kFirstHttpHostVisitMoreThan24hAgo :
+      features::kFirstHttpsHostVisitMoreThan24hAgo,
+      (first_visit < (base::Time::Now() - base::TimeDelta::FromDays(1))) ?
+      1.0 : 0.0,
+      request);
+}
+
+void BrowserFeatureExtractor::StorePendingQuery(
+    CancelableRequestProvider::Handle handle,
+    ClientPhishingRequest* request,
+    DoneCallback* callback) {
+  DCHECK_EQ(0U, pending_queries_.count(handle));
+  pending_queries_[handle] = std::make_pair(request, callback);
+}
+
+bool BrowserFeatureExtractor::GetPendingQuery(
+    CancelableRequestProvider::Handle handle,
+    ClientPhishingRequest** request,
+    DoneCallback** callback) {
+  PendingQueriesMap::iterator it = pending_queries_.find(handle);
+  DCHECK(it != pending_queries_.end());
+  if (it != pending_queries_.end()) {
+    *request = it->second.first;
+    *callback = it->second.second;
+    pending_queries_.erase(it);
+    return true;
+  }
+  return false;
+}
+
+bool BrowserFeatureExtractor::GetHistoryService(HistoryService** history) {
+  *history = NULL;
+  if (tab_ && tab_->profile()) {
+    *history = tab_->profile()->GetHistoryService(Profile::EXPLICIT_ACCESS);
+    if (*history) {
+      return true;
+    }
+  }
+  VLOG(2) << "Unable to query history.  No history service available.";
+  return false;
+}
+};  // namespace safe_browsing