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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/content_settings/content_settings_utils.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/command_line.h"
     10 #include "base/logging.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/memory/scoped_vector.h"
     13 #include "base/strings/string_split.h"
     14 #include "base/values.h"
     15 #include "chrome/browser/content_settings/content_settings_provider.h"
     16 #include "chrome/browser/content_settings/content_settings_rule.h"
     17 #include "chrome/browser/content_settings/host_content_settings_map.h"
     18 #include "chrome/common/chrome_switches.h"
     19 #include "chrome/common/content_settings_pattern.h"
     20 #include "url/gurl.h"
     21 
     22 namespace {
     23 
     24 // The names of the ContentSettingsType values, for use with dictionary prefs.
     25 const char* kTypeNames[] = {
     26   "cookies",
     27   "images",
     28   "javascript",
     29   "plugins",
     30   "popups",
     31   "geolocation",
     32   "notifications",
     33   "auto-select-certificate",
     34   "fullscreen",
     35   "mouselock",
     36   "mixed-script",
     37   "media-stream",
     38   "media-stream-mic",
     39   "media-stream-camera",
     40   "register-protocol-handler",
     41   "ppapi-broker",
     42   "multiple-automatic-downloads",
     43   "midi-sysex",
     44 #if defined(OS_WIN)
     45   "metro-switch-to-desktop",
     46 #elif defined(OS_ANDROID) || defined(OS_CHROMEOS)
     47   "protected-media-identifier",
     48 #endif
     49 };
     50 COMPILE_ASSERT(arraysize(kTypeNames) == CONTENT_SETTINGS_NUM_TYPES,
     51                type_names_incorrect_size);
     52 
     53 const char kPatternSeparator[] = ",";
     54 
     55 }  // namespace
     56 
     57 namespace content_settings {
     58 
     59 std::string GetTypeName(ContentSettingsType type) {
     60   return std::string(kTypeNames[type]);
     61 }
     62 
     63 std::string CreatePatternString(
     64     const ContentSettingsPattern& item_pattern,
     65     const ContentSettingsPattern& top_level_frame_pattern) {
     66   return item_pattern.ToString()
     67          + std::string(kPatternSeparator)
     68          + top_level_frame_pattern.ToString();
     69 }
     70 
     71 PatternPair ParsePatternString(const std::string& pattern_str) {
     72   std::vector<std::string> pattern_str_list;
     73   base::SplitString(pattern_str, kPatternSeparator[0], &pattern_str_list);
     74 
     75   // If the |pattern_str| is an empty string then the |pattern_string_list|
     76   // contains a single empty string. In this case the empty string will be
     77   // removed to signal an invalid |pattern_str|. Invalid pattern strings are
     78   // handle by the "if"-statment below. So the order of the if statements here
     79   // must be preserved.
     80   if (pattern_str_list.size() == 1) {
     81     if (pattern_str_list[0].empty()) {
     82       pattern_str_list.pop_back();
     83     } else {
     84       pattern_str_list.push_back("*");
     85     }
     86   }
     87 
     88   if (pattern_str_list.size() > 2 ||
     89       pattern_str_list.size() == 0) {
     90     return PatternPair(ContentSettingsPattern(),
     91                        ContentSettingsPattern());
     92   }
     93 
     94   PatternPair pattern_pair;
     95   pattern_pair.first =
     96       ContentSettingsPattern::FromString(pattern_str_list[0]);
     97   pattern_pair.second =
     98       ContentSettingsPattern::FromString(pattern_str_list[1]);
     99   return pattern_pair;
    100 }
    101 
    102 ContentSetting ValueToContentSetting(const base::Value* value) {
    103   ContentSetting setting = CONTENT_SETTING_DEFAULT;
    104   bool valid = ParseContentSettingValue(value, &setting);
    105   DCHECK(valid);
    106   return setting;
    107 }
    108 
    109 bool ParseContentSettingValue(const base::Value* value,
    110                               ContentSetting* setting) {
    111   if (!value) {
    112     *setting = CONTENT_SETTING_DEFAULT;
    113     return true;
    114   }
    115   int int_value = -1;
    116   if (!value->GetAsInteger(&int_value))
    117     return false;
    118   *setting = IntToContentSetting(int_value);
    119   return *setting != CONTENT_SETTING_DEFAULT;
    120 }
    121 
    122 base::Value* GetContentSettingValueAndPatterns(
    123     const ProviderInterface* provider,
    124     const GURL& primary_url,
    125     const GURL& secondary_url,
    126     ContentSettingsType content_type,
    127     const std::string& resource_identifier,
    128     bool include_incognito,
    129     ContentSettingsPattern* primary_pattern,
    130     ContentSettingsPattern* secondary_pattern) {
    131   if (include_incognito) {
    132     // Check incognito-only specific settings. It's essential that the
    133     // |RuleIterator| gets out of scope before we get a rule iterator for the
    134     // normal mode.
    135     scoped_ptr<RuleIterator> incognito_rule_iterator(
    136         provider->GetRuleIterator(content_type, resource_identifier, true));
    137     base::Value* value = GetContentSettingValueAndPatterns(
    138         incognito_rule_iterator.get(), primary_url, secondary_url,
    139         primary_pattern, secondary_pattern);
    140     if (value)
    141       return value;
    142   }
    143   // No settings from the incognito; use the normal mode.
    144   scoped_ptr<RuleIterator> rule_iterator(
    145       provider->GetRuleIterator(content_type, resource_identifier, false));
    146   return GetContentSettingValueAndPatterns(
    147       rule_iterator.get(), primary_url, secondary_url,
    148       primary_pattern, secondary_pattern);
    149 }
    150 
    151 base::Value* GetContentSettingValueAndPatterns(
    152     RuleIterator* rule_iterator,
    153     const GURL& primary_url,
    154     const GURL& secondary_url,
    155     ContentSettingsPattern* primary_pattern,
    156     ContentSettingsPattern* secondary_pattern) {
    157   while (rule_iterator->HasNext()) {
    158     const Rule& rule = rule_iterator->Next();
    159     if (rule.primary_pattern.Matches(primary_url) &&
    160         rule.secondary_pattern.Matches(secondary_url)) {
    161       if (primary_pattern)
    162         *primary_pattern = rule.primary_pattern;
    163       if (secondary_pattern)
    164         *secondary_pattern = rule.secondary_pattern;
    165       return rule.value.get()->DeepCopy();
    166     }
    167   }
    168   return NULL;
    169 }
    170 
    171 base::Value* GetContentSettingValue(const ProviderInterface* provider,
    172                                     const GURL& primary_url,
    173                                     const GURL& secondary_url,
    174                                     ContentSettingsType content_type,
    175                                     const std::string& resource_identifier,
    176                                     bool include_incognito) {
    177   return GetContentSettingValueAndPatterns(provider, primary_url, secondary_url,
    178                                content_type, resource_identifier,
    179                                include_incognito, NULL, NULL);
    180 }
    181 
    182 ContentSetting GetContentSetting(const ProviderInterface* provider,
    183                                  const GURL& primary_url,
    184                                  const GURL& secondary_url,
    185                                  ContentSettingsType content_type,
    186                                  const std::string& resource_identifier,
    187                                  bool include_incognito) {
    188   scoped_ptr<base::Value> value(
    189       GetContentSettingValue(provider, primary_url, secondary_url,
    190                              content_type, resource_identifier,
    191                              include_incognito));
    192   return ValueToContentSetting(value.get());
    193 }
    194 
    195 void GetRendererContentSettingRules(const HostContentSettingsMap* map,
    196                                     RendererContentSettingRules* rules) {
    197   map->GetSettingsForOneType(
    198       CONTENT_SETTINGS_TYPE_IMAGES, std::string(), &(rules->image_rules));
    199   map->GetSettingsForOneType(
    200       CONTENT_SETTINGS_TYPE_JAVASCRIPT, std::string(), &(rules->script_rules));
    201 }
    202 
    203 }  // namespace content_settings
    204