Add an extractor for DOM features to be used for client side phishing detection.

chrome/renderer/safe_browsing/features.h

 // Copyright (c) 2010 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.
 //
 // Common types and constants for extracting and evaluating features in the
 // client-side phishing detection model.  A feature is simply a string and an
 // associated floating-point value between 0 and 1.  The phishing
 // classification model contains rules which give an appropriate weight to each
 // feature or combination of features.  These values can then be summed to
 // compute a final phishiness score.
@@ skipping 26 matching lines @@
 class FeatureMap {
  public:
   FeatureMap();
   ~FeatureMap();
 
   // Adds a boolean feature to a FeatureMap with a value of 1.0.
   // Returns true on success, or false if the feature map exceeds
   // kMaxFeatureMapSize.
   bool AddBooleanFeature(const std::string& name);
 
+  // Adds a real-valued feature to a FeatureMap with the given value.
+  // Values must always be in the range [0.0, 1.0].  Returns true on
+  // success, or false if the feature map exceeds kMaxFeatureMapSize
+  // or the value is outside of the allowed range.
+  bool AddRealFeature(const std::string& name, double value);
+
   // Provides read-only access to the current set of features.
   const base::hash_map<std::string, double>& features() const {
     return features_;
   }
 
   // Clears the set of features in the map.
   void Clear();
 
   // This is an upper bound on the number of features that will be extracted.
   // We should never hit this cap; it is intended as a sanity check to prevent
@@ skipping 39 matching lines @@
 
 ////////////////////////////////////////////////////
 // URL path token features
 ////////////////////////////////////////////////////
 
 // Token feature containing each alphanumeric string in the path that is at
 // least 3 characters long.  For example, "/abc/d/efg" would have 2 path
 // token features, "abc" and "efg".  Query parameters are not included.
 extern const char kUrlPathToken[];
 
+////////////////////////////////////////////////////
+// DOM HTML form features
+////////////////////////////////////////////////////
+
+// Set if the page has any <form> elements.
+extern const char kPageHasForms[];
+// The fraction of form elements whose |action| attribute points to a
+// URL on a different domain from the document URL.
+extern const char kPageActionOtherDomainFreq[];
+
+// Set if the page has any <input type="text"> elements
+// (includes inputs with missing or unknown types).
+extern const char kPageHasTextInputs[];
+// Set if the page has any <input type="password"> elements.
+extern const char kPageHasPswdInputs[];
+// Set if the page has any <input type="radio"> elements.
+extern const char kPageHasRadioInputs[];
+// Set if the page has any <input type="checkbox"> elements.
+extern const char kPageHasCheckInputs[];
+
+////////////////////////////////////////////////////
+// DOM HTML link features
+////////////////////////////////////////////////////
+
+// The fraction of links in the page which point to a domain other than the
+// domain of the document.  See "URL host features" above for a discussion
+// of how the doamin is computed.
+extern const char kPageExternalLinksFreq[];
+// Token feature containing each external domain that is linked to.
+extern const char kPageLinkDomain[];
+// Fraction of links in the page that use https.
+extern const char kPageSecureLinksFreq[];
+
+////////////////////////////////////////////////////
+// DOM HTML script features
+////////////////////////////////////////////////////
+
+// Set if the number of <script> elements in the page is greater than 1.
+extern const char kPageNumScriptTagsGTOne[];
+// Set if the number of <script> elements in the page is greater than 6.
+extern const char kPageNumScriptTagsGTSix[];
+
+////////////////////////////////////////////////////
+// Other DOM HTML features
+////////////////////////////////////////////////////
+
+// The fraction of images whose src attribute points to an external domain.
+extern const char kPageImgOtherDomainFreq[];
+
 }  // namespace features
 }  // namepsace safe_browsing
 
 #endif  // CHROME_RENDERER_SAFE_BROWSING_FEATURES_H_