Domain Reliability: More security review.

components/domain_reliability/config.cc

 // 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 "components/domain_reliability/config.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_value_converter.h"
 #include "base/rand_util.h"
 #include "base/strings/string_util.h"
 
 namespace {
 
 bool ConvertURL(const base::StringPiece& string_piece, GURL* url) {
   *url = GURL(string_piece.as_string());
   return url->is_valid();
 }
 
 bool IsValidSampleRate(double p) { return p >= 0.0 && p <= 1.0; }
 
 }  // namespace
 
 namespace domain_reliability {
 
-DomainReliabilityConfig::Resource::Resource() {}
+// static
+const size_t DomainReliabilityConfig::kInvalidResourceIndex =
+    static_cast<size_t>(~0);
 
+DomainReliabilityConfig::Resource::Resource() {
+}
 DomainReliabilityConfig::Resource::~Resource() {}
 
-bool DomainReliabilityConfig::Resource::MatchesUrlString(
-    const std::string& url_string) const {
+bool DomainReliabilityConfig::Resource::MatchesUrl(const GURL& url) const {
+  const std::string& spec = url.spec();
+
   ScopedVector<std::string>::const_iterator it;
-
   for (it = url_patterns.begin(); it != url_patterns.end(); it++) {
-    if (MatchPattern(url_string, **it))
+    if (MatchPattern(spec, **it))
       return true;
   }
 
   return false;
 }
 
 bool DomainReliabilityConfig::Resource::DecideIfShouldReportRequest(
     bool success) const {
   double sample_rate = success ? success_sample_rate : failure_sample_rate;
+  DCHECK(IsValidSampleRate(sample_rate));
   return base::RandDouble() < sample_rate;
 }
 
 // static
 void DomainReliabilityConfig::Resource::RegisterJSONConverter(
     base::JSONValueConverter<DomainReliabilityConfig::Resource>* converter) {
   converter->RegisterStringField("resource_name", &Resource::name);
   converter->RegisterRepeatedString("url_patterns", &Resource::url_patterns);
   converter->RegisterDoubleField("success_sample_rate",
                                  &Resource::success_sample_rate);
   converter->RegisterDoubleField("failure_sample_rate",
                                  &Resource::failure_sample_rate);
 }
 
 bool DomainReliabilityConfig::Resource::IsValid() const {
   return !name.empty() && !url_patterns.empty() &&
       IsValidSampleRate(success_sample_rate) &&
       IsValidSampleRate(failure_sample_rate);
 }
 
 DomainReliabilityConfig::Collector::Collector() {}
-
 DomainReliabilityConfig::Collector::~Collector() {}
 
 // static
 void DomainReliabilityConfig::Collector::RegisterJSONConverter(
     base::JSONValueConverter<DomainReliabilityConfig::Collector>* converter) {
   converter->RegisterCustomField<GURL>("upload_url", &Collector::upload_url,
                                        &ConvertURL);
 }
 
 bool DomainReliabilityConfig::Collector::IsValid() const {
   return upload_url.is_valid();
 }
 
 DomainReliabilityConfig::DomainReliabilityConfig() : valid_until(0.0) {}
-
 DomainReliabilityConfig::~DomainReliabilityConfig() {}
 
 // static
 scoped_ptr<const DomainReliabilityConfig> DomainReliabilityConfig::FromJSON(
     const base::StringPiece& json) {
   scoped_ptr<base::Value> value(base::JSONReader::Read(json));
-  if (!value)
+  base::JSONValueConverter<DomainReliabilityConfig> converter;
+  DomainReliabilityConfig* config = new DomainReliabilityConfig();
+
+  // If we can parse and convert the JSON into a valid config, return that.
+  if (value && converter.Convert(*value, config) && config->IsValid())
+    return scoped_ptr<const DomainReliabilityConfig>(config);
+  else
     return scoped_ptr<const DomainReliabilityConfig>();
-
-  DomainReliabilityConfig* config = new DomainReliabilityConfig();
-  base::JSONValueConverter<DomainReliabilityConfig> converter;
-  if (!converter.Convert(*value, config)) {
-    return scoped_ptr<const DomainReliabilityConfig>();
-  }
-
-  if (!config->IsValid())
-    return scoped_ptr<const DomainReliabilityConfig>();
-
-  return scoped_ptr<const DomainReliabilityConfig>(config);
 }
 
 bool DomainReliabilityConfig::IsValid() const {
   if (valid_until == 0.0 || domain.empty() || version.empty() ||
       resources.empty() || collectors.empty()) {
     return false;
   }
 
   for (size_t i = 0; i < resources.size(); ++i) {
     if (!resources[i]->IsValid())
       return false;
   }
 
   for (size_t i = 0; i < collectors.size(); ++i) {
     if (!collectors[i]->IsValid())
       return false;
   }
 
   return true;
 }
 
 bool DomainReliabilityConfig::IsExpired(base::Time now) const {
+  DCHECK_NE(0.0, valid_until);
   base::Time valid_until_time = base::Time::FromDoubleT(valid_until);
   return now > valid_until_time;
 }
 
-int DomainReliabilityConfig::GetResourceIndexForUrl(const GURL& url) const {
-  const std::string& url_string = url.spec();
+size_t DomainReliabilityConfig::GetResourceIndexForUrl(const GURL& url) const {
+  // Removes username, password, and fragment.
+  GURL sanitized_url = url.GetAsReferrer();
 
   for (size_t i = 0; i < resources.size(); ++i) {
-    if (resources[i]->MatchesUrlString(url_string))
-      return static_cast<int>(i);
+    if (resources[i]->MatchesUrl(sanitized_url))
+      return i;
   }
 
-  return -1;
+  return static_cast<size_t>(~0);
 }
 
 // static
 void DomainReliabilityConfig::RegisterJSONConverter(
     base::JSONValueConverter<DomainReliabilityConfig>* converter) {
   converter->RegisterStringField("config_version",
                                  &DomainReliabilityConfig::version);
   converter->RegisterDoubleField("config_valid_until",
                                  &DomainReliabilityConfig::valid_until);
   converter->RegisterStringField("monitored_domain",
                                  &DomainReliabilityConfig::domain);
   converter->RegisterRepeatedMessage("monitored_resources",
                                      &DomainReliabilityConfig::resources);
   converter->RegisterRepeatedMessage("collectors",
                                      &DomainReliabilityConfig::collectors);
 }
 
 }  // namespace domain_reliability