host_content_settings_map.cc revision 116680a4aac90f2aa7413d9095a592090648e557 
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/host_content_settings_map.h"
6
7#include <utility>
8
9#include "base/basictypes.h"
10#include "base/command_line.h"
11#include "base/prefs/pref_service.h"
12#include "base/stl_util.h"
13#include "base/strings/string_util.h"
14#include "base/strings/utf_string_conversions.h"
15#include "base/time/clock.h"
16#include "chrome/browser/chrome_notification_types.h"
17#include "chrome/browser/content_settings/content_settings_custom_extension_provider.h"
18#include "chrome/browser/content_settings/content_settings_default_provider.h"
19#include "chrome/browser/content_settings/content_settings_details.h"
20#include "chrome/browser/content_settings/content_settings_internal_extension_provider.h"
21#include "chrome/browser/content_settings/content_settings_observable_provider.h"
22#include "chrome/browser/content_settings/content_settings_policy_provider.h"
23#include "chrome/browser/content_settings/content_settings_pref_provider.h"
24#include "chrome/browser/content_settings/content_settings_provider.h"
25#include "chrome/browser/content_settings/content_settings_rule.h"
26#include "chrome/browser/content_settings/content_settings_utils.h"
27#include "chrome/browser/extensions/api/content_settings/content_settings_service.h"
28#include "chrome/browser/extensions/extension_service.h"
29#include "chrome/common/chrome_switches.h"
30#include "chrome/common/content_settings_pattern.h"
31#include "chrome/common/pref_names.h"
32#include "chrome/common/url_constants.h"
33#include "components/pref_registry/pref_registry_syncable.h"
34#include "content/public/browser/browser_thread.h"
35#include "content/public/browser/notification_service.h"
36#include "content/public/browser/notification_source.h"
37#include "content/public/browser/user_metrics.h"
38#include "content/public/common/content_switches.h"
39#include "extensions/browser/extension_prefs.h"
40#include "extensions/common/constants.h"
41#include "net/base/net_errors.h"
42#include "net/base/static_cookie_policy.h"
43#include "url/gurl.h"
44
45using base::UserMetricsAction;
46using content::BrowserThread;
47
48namespace {
49
50typedef std::vector<content_settings::Rule> Rules;
51
52typedef std::pair<std::string, std::string> StringPair;
53
54// TODO(bauerb): Expose constants.
55const char* kProviderNames[] = {
56  "platform_app",
57  "policy",
58  "extension",
59  "preference",
60  "default"
61};
62
63content_settings::SettingSource kProviderSourceMap[] = {
64  content_settings::SETTING_SOURCE_EXTENSION,
65  content_settings::SETTING_SOURCE_POLICY,
66  content_settings::SETTING_SOURCE_EXTENSION,
67  content_settings::SETTING_SOURCE_USER,
68  content_settings::SETTING_SOURCE_USER,
69};
70COMPILE_ASSERT(arraysize(kProviderSourceMap) ==
71                   HostContentSettingsMap::NUM_PROVIDER_TYPES,
72               kProviderSourceMap_has_incorrect_size);
73
74// Returns true if the |content_type| supports a resource identifier.
75// Resource identifiers are supported (but not required) for plug-ins.
76bool SupportsResourceIdentifier(ContentSettingsType content_type) {
77  return content_type == CONTENT_SETTINGS_TYPE_PLUGINS;
78}
79
80}  // namespace
81
82HostContentSettingsMap::HostContentSettingsMap(
83    PrefService* prefs,
84    bool incognito) :
85#ifndef NDEBUG
86      used_from_thread_id_(base::PlatformThread::CurrentId()),
87#endif
88      prefs_(prefs),
89      is_off_the_record_(incognito) {
90  content_settings::ObservableProvider* policy_provider =
91      new content_settings::PolicyProvider(prefs_);
92  policy_provider->AddObserver(this);
93  content_settings_providers_[POLICY_PROVIDER] = policy_provider;
94
95  content_settings::ObservableProvider* pref_provider =
96      new content_settings::PrefProvider(prefs_, is_off_the_record_);
97  pref_provider->AddObserver(this);
98  content_settings_providers_[PREF_PROVIDER] = pref_provider;
99
100  content_settings::ObservableProvider* default_provider =
101      new content_settings::DefaultProvider(prefs_, is_off_the_record_);
102  default_provider->AddObserver(this);
103  content_settings_providers_[DEFAULT_PROVIDER] = default_provider;
104
105  if (!is_off_the_record_) {
106    // Migrate obsolete preferences.
107    MigrateObsoleteClearOnExitPref();
108  }
109}
110
111#if defined(ENABLE_EXTENSIONS)
112void HostContentSettingsMap::RegisterExtensionService(
113    ExtensionService* extension_service) {
114  DCHECK(extension_service);
115  DCHECK(!content_settings_providers_[INTERNAL_EXTENSION_PROVIDER]);
116  DCHECK(!content_settings_providers_[CUSTOM_EXTENSION_PROVIDER]);
117
118  content_settings::InternalExtensionProvider* internal_extension_provider =
119      new content_settings::InternalExtensionProvider(extension_service);
120  internal_extension_provider->AddObserver(this);
121  content_settings_providers_[INTERNAL_EXTENSION_PROVIDER] =
122      internal_extension_provider;
123
124  content_settings::ObservableProvider* custom_extension_provider =
125      new content_settings::CustomExtensionProvider(
126          extensions::ContentSettingsService::Get(
127              extension_service->GetBrowserContext())->content_settings_store(),
128          is_off_the_record_);
129  custom_extension_provider->AddObserver(this);
130  content_settings_providers_[CUSTOM_EXTENSION_PROVIDER] =
131      custom_extension_provider;
132
133#ifndef NDEBUG
134  DCHECK(used_from_thread_id_ != base::kInvalidThreadId)
135      << "Used from multiple threads before initialization complete.";
136#endif
137
138  OnContentSettingChanged(ContentSettingsPattern(),
139                          ContentSettingsPattern(),
140                          CONTENT_SETTINGS_TYPE_DEFAULT,
141                          std::string());
142}
143#endif
144
145// static
146void HostContentSettingsMap::RegisterProfilePrefs(
147    user_prefs::PrefRegistrySyncable* registry) {
148  registry->RegisterIntegerPref(
149      prefs::kContentSettingsWindowLastTabIndex,
150      0,
151      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
152  registry->RegisterIntegerPref(
153      prefs::kContentSettingsDefaultWhitelistVersion,
154      0,
155      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
156  registry->RegisterBooleanPref(
157      prefs::kContentSettingsClearOnExitMigrated,
158      false,
159      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
160
161  // Register the prefs for the content settings providers.
162  content_settings::DefaultProvider::RegisterProfilePrefs(registry);
163  content_settings::PrefProvider::RegisterProfilePrefs(registry);
164  content_settings::PolicyProvider::RegisterProfilePrefs(registry);
165}
166
167ContentSetting HostContentSettingsMap::GetDefaultContentSettingFromProvider(
168    ContentSettingsType content_type,
169    content_settings::ProviderInterface* provider) const {
170  scoped_ptr<content_settings::RuleIterator> rule_iterator(
171      provider->GetRuleIterator(content_type, std::string(), false));
172
173  ContentSettingsPattern wildcard = ContentSettingsPattern::Wildcard();
174  while (rule_iterator->HasNext()) {
175    content_settings::Rule rule = rule_iterator->Next();
176    if (rule.primary_pattern == wildcard &&
177        rule.secondary_pattern == wildcard) {
178      return content_settings::ValueToContentSetting(rule.value.get());
179    }
180  }
181  return CONTENT_SETTING_DEFAULT;
182}
183
184ContentSetting HostContentSettingsMap::GetDefaultContentSetting(
185    ContentSettingsType content_type,
186    std::string* provider_id) const {
187  UsedContentSettingsProviders();
188
189  // Iterate through the list of providers and return the first non-NULL value
190  // that matches |primary_url| and |secondary_url|.
191  for (ConstProviderIterator provider = content_settings_providers_.begin();
192       provider != content_settings_providers_.end();
193       ++provider) {
194    if (provider->first == PREF_PROVIDER)
195      continue;
196    ContentSetting default_setting =
197        GetDefaultContentSettingFromProvider(content_type, provider->second);
198    if (default_setting != CONTENT_SETTING_DEFAULT) {
199      if (provider_id)
200        *provider_id = kProviderNames[provider->first];
201      return default_setting;
202    }
203  }
204
205  // The method GetDefaultContentSetting always has to return an explicit
206  // value that is to be used as default. We here rely on the
207  // DefaultProvider to always provide a value.
208  NOTREACHED();
209  return CONTENT_SETTING_DEFAULT;
210}
211
212ContentSetting HostContentSettingsMap::GetContentSetting(
213    const GURL& primary_url,
214    const GURL& secondary_url,
215    ContentSettingsType content_type,
216    const std::string& resource_identifier) const {
217  DCHECK(!ContentTypeHasCompoundValue(content_type));
218  scoped_ptr<base::Value> value(GetWebsiteSetting(
219      primary_url, secondary_url, content_type, resource_identifier, NULL));
220  return content_settings::ValueToContentSetting(value.get());
221}
222
223void HostContentSettingsMap::GetSettingsForOneType(
224    ContentSettingsType content_type,
225    const std::string& resource_identifier,
226    ContentSettingsForOneType* settings) const {
227  DCHECK(SupportsResourceIdentifier(content_type) ||
228         resource_identifier.empty());
229  DCHECK(settings);
230  UsedContentSettingsProviders();
231
232  settings->clear();
233  for (ConstProviderIterator provider = content_settings_providers_.begin();
234       provider != content_settings_providers_.end();
235       ++provider) {
236    // For each provider, iterate first the incognito-specific rules, then the
237    // normal rules.
238    if (is_off_the_record_) {
239      AddSettingsForOneType(provider->second,
240                            provider->first,
241                            content_type,
242                            resource_identifier,
243                            settings,
244                            true);
245    }
246    AddSettingsForOneType(provider->second,
247                          provider->first,
248                          content_type,
249                          resource_identifier,
250                          settings,
251                          false);
252  }
253}
254
255void HostContentSettingsMap::SetDefaultContentSetting(
256    ContentSettingsType content_type,
257    ContentSetting setting) {
258  DCHECK(IsSettingAllowedForType(prefs_, setting, content_type));
259
260  base::Value* value = NULL;
261  if (setting != CONTENT_SETTING_DEFAULT)
262    value = base::Value::CreateIntegerValue(setting);
263  SetWebsiteSetting(
264      ContentSettingsPattern::Wildcard(),
265      ContentSettingsPattern::Wildcard(),
266      content_type,
267      std::string(),
268      value);
269}
270
271void HostContentSettingsMap::SetWebsiteSetting(
272    const ContentSettingsPattern& primary_pattern,
273    const ContentSettingsPattern& secondary_pattern,
274    ContentSettingsType content_type,
275    const std::string& resource_identifier,
276    base::Value* value) {
277  DCHECK(IsValueAllowedForType(prefs_, value, content_type));
278  DCHECK(SupportsResourceIdentifier(content_type) ||
279         resource_identifier.empty());
280  UsedContentSettingsProviders();
281
282  for (ProviderIterator provider = content_settings_providers_.begin();
283       provider != content_settings_providers_.end();
284       ++provider) {
285    if (provider->second->SetWebsiteSetting(primary_pattern,
286                                            secondary_pattern,
287                                            content_type,
288                                            resource_identifier,
289                                            value)) {
290      return;
291    }
292  }
293  NOTREACHED();
294}
295
296void HostContentSettingsMap::SetContentSetting(
297    const ContentSettingsPattern& primary_pattern,
298    const ContentSettingsPattern& secondary_pattern,
299    ContentSettingsType content_type,
300    const std::string& resource_identifier,
301    ContentSetting setting) {
302  DCHECK(!ContentTypeHasCompoundValue(content_type));
303
304  if (setting == CONTENT_SETTING_ALLOW &&
305      (content_type == CONTENT_SETTINGS_TYPE_GEOLOCATION ||
306       content_type == CONTENT_SETTINGS_TYPE_NOTIFICATIONS)) {
307    UpdateLastUsageByPattern(primary_pattern, secondary_pattern, content_type);
308  }
309
310  base::Value* value = NULL;
311  if (setting != CONTENT_SETTING_DEFAULT)
312    value = base::Value::CreateIntegerValue(setting);
313  SetWebsiteSetting(primary_pattern,
314                    secondary_pattern,
315                    content_type,
316                    resource_identifier,
317                    value);
318}
319
320ContentSetting HostContentSettingsMap::GetContentSettingAndMaybeUpdateLastUsage(
321    const GURL& primary_url,
322    const GURL& secondary_url,
323    ContentSettingsType content_type,
324    const std::string& resource_identifier) {
325  DCHECK_CURRENTLY_ON(BrowserThread::UI);
326
327  ContentSetting setting = GetContentSetting(
328      primary_url, secondary_url, content_type, resource_identifier);
329  if (setting == CONTENT_SETTING_ALLOW) {
330    UpdateLastUsageByPattern(
331        ContentSettingsPattern::FromURLNoWildcard(primary_url),
332        ContentSettingsPattern::FromURLNoWildcard(secondary_url),
333        content_type);
334  }
335  return setting;
336}
337
338void HostContentSettingsMap::UpdateLastUsage(const GURL& primary_url,
339                                             const GURL& secondary_url,
340                                             ContentSettingsType content_type) {
341  UpdateLastUsageByPattern(
342      ContentSettingsPattern::FromURLNoWildcard(primary_url),
343      ContentSettingsPattern::FromURLNoWildcard(secondary_url),
344      content_type);
345}
346
347void HostContentSettingsMap::UpdateLastUsageByPattern(
348    const ContentSettingsPattern& primary_pattern,
349    const ContentSettingsPattern& secondary_pattern,
350    ContentSettingsType content_type) {
351  UsedContentSettingsProviders();
352
353  GetPrefProvider()->UpdateLastUsage(
354      primary_pattern, secondary_pattern, content_type);
355}
356
357base::Time HostContentSettingsMap::GetLastUsage(
358    const GURL& primary_url,
359    const GURL& secondary_url,
360    ContentSettingsType content_type) {
361  return GetLastUsageByPattern(
362      ContentSettingsPattern::FromURLNoWildcard(primary_url),
363      ContentSettingsPattern::FromURLNoWildcard(secondary_url),
364      content_type);
365}
366
367base::Time HostContentSettingsMap::GetLastUsageByPattern(
368    const ContentSettingsPattern& primary_pattern,
369    const ContentSettingsPattern& secondary_pattern,
370    ContentSettingsType content_type) {
371  UsedContentSettingsProviders();
372
373  return GetPrefProvider()->GetLastUsage(
374      primary_pattern, secondary_pattern, content_type);
375}
376
377void HostContentSettingsMap::SetPrefClockForTesting(
378    scoped_ptr<base::Clock> clock) {
379  UsedContentSettingsProviders();
380
381  GetPrefProvider()->SetClockForTesting(clock.Pass());
382}
383
384void HostContentSettingsMap::AddExceptionForURL(
385    const GURL& primary_url,
386    const GURL& secondary_url,
387    ContentSettingsType content_type,
388    ContentSetting setting) {
389  // TODO(markusheintz): Until the UI supports pattern pairs, both urls must
390  // match.
391  DCHECK(primary_url == secondary_url);
392  DCHECK(!ContentTypeHasCompoundValue(content_type));
393
394  // Make sure there is no entry that would override the pattern we are about
395  // to insert for exactly this URL.
396  SetContentSetting(ContentSettingsPattern::FromURLNoWildcard(primary_url),
397                    ContentSettingsPattern::Wildcard(),
398                    content_type,
399                    std::string(),
400                    CONTENT_SETTING_DEFAULT);
401
402  SetContentSetting(ContentSettingsPattern::FromURL(primary_url),
403                    ContentSettingsPattern::Wildcard(),
404                    content_type,
405                    std::string(),
406                    setting);
407}
408
409void HostContentSettingsMap::ClearSettingsForOneType(
410    ContentSettingsType content_type) {
411  UsedContentSettingsProviders();
412  for (ProviderIterator provider = content_settings_providers_.begin();
413       provider != content_settings_providers_.end();
414       ++provider) {
415    provider->second->ClearAllContentSettingsRules(content_type);
416  }
417}
418
419bool HostContentSettingsMap::IsValueAllowedForType(
420    PrefService* prefs, const base::Value* value, ContentSettingsType type) {
421  return ContentTypeHasCompoundValue(type) || IsSettingAllowedForType(
422      prefs, content_settings::ValueToContentSetting(value), type);
423}
424
425// static
426bool HostContentSettingsMap::IsSettingAllowedForType(
427    PrefService* prefs,
428    ContentSetting setting,
429    ContentSettingsType content_type) {
430  // We don't yet support stored content settings for mixed scripting.
431  if (content_type == CONTENT_SETTINGS_TYPE_MIXEDSCRIPT)
432    return false;
433
434  // BLOCK semantics are not implemented for fullscreen.
435  if (content_type == CONTENT_SETTINGS_TYPE_FULLSCREEN &&
436      setting == CONTENT_SETTING_BLOCK) {
437    return false;
438  }
439
440  // We don't support ALLOW for media default setting.
441  if (content_type == CONTENT_SETTINGS_TYPE_MEDIASTREAM &&
442      setting == CONTENT_SETTING_ALLOW) {
443    return false;
444  }
445
446#if defined(OS_ANDROID)
447  // App banners store a dictionary.
448  if (content_type == CONTENT_SETTINGS_TYPE_APP_BANNER)
449    return false;
450#endif
451
452  // DEFAULT, ALLOW and BLOCK are always allowed.
453  if (setting == CONTENT_SETTING_DEFAULT ||
454      setting == CONTENT_SETTING_ALLOW ||
455      setting == CONTENT_SETTING_BLOCK) {
456    return true;
457  }
458  switch (content_type) {
459    case CONTENT_SETTINGS_TYPE_COOKIES:
460      return setting == CONTENT_SETTING_SESSION_ONLY;
461    case CONTENT_SETTINGS_TYPE_PLUGINS:
462    case CONTENT_SETTINGS_TYPE_GEOLOCATION:
463    case CONTENT_SETTINGS_TYPE_NOTIFICATIONS:
464    case CONTENT_SETTINGS_TYPE_MOUSELOCK:
465    case CONTENT_SETTINGS_TYPE_MEDIASTREAM:
466    case CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC:
467    case CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA:
468    case CONTENT_SETTINGS_TYPE_PPAPI_BROKER:
469    case CONTENT_SETTINGS_TYPE_AUTOMATIC_DOWNLOADS:
470    case CONTENT_SETTINGS_TYPE_MIDI_SYSEX:
471      return setting == CONTENT_SETTING_ASK;
472    default:
473      return false;
474  }
475}
476
477// static
478bool HostContentSettingsMap::ContentTypeHasCompoundValue(
479    ContentSettingsType type) {
480  // Values for content type CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE and
481  // CONTENT_SETTINGS_TYPE_MEDIASTREAM are of type dictionary/map. Compound
482  // types like dictionaries can't be mapped to the type |ContentSetting|.
483#if defined(OS_ANDROID)
484  if (type == CONTENT_SETTINGS_TYPE_APP_BANNER)
485    return true;
486#endif
487
488  return (type == CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE ||
489          type == CONTENT_SETTINGS_TYPE_MEDIASTREAM);
490}
491
492void HostContentSettingsMap::OnContentSettingChanged(
493    const ContentSettingsPattern& primary_pattern,
494    const ContentSettingsPattern& secondary_pattern,
495    ContentSettingsType content_type,
496    std::string resource_identifier) {
497  const ContentSettingsDetails details(primary_pattern,
498                                       secondary_pattern,
499                                       content_type,
500                                       resource_identifier);
501  content::NotificationService::current()->Notify(
502      chrome::NOTIFICATION_CONTENT_SETTINGS_CHANGED,
503      content::Source<HostContentSettingsMap>(this),
504      content::Details<const ContentSettingsDetails>(&details));
505}
506
507HostContentSettingsMap::~HostContentSettingsMap() {
508  DCHECK(!prefs_);
509  STLDeleteValues(&content_settings_providers_);
510}
511
512void HostContentSettingsMap::ShutdownOnUIThread() {
513  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
514  DCHECK(prefs_);
515  prefs_ = NULL;
516  for (ProviderIterator it = content_settings_providers_.begin();
517       it != content_settings_providers_.end();
518       ++it) {
519    it->second->ShutdownOnUIThread();
520  }
521}
522
523void HostContentSettingsMap::MigrateObsoleteClearOnExitPref() {
524  // Don't migrate more than once.
525  if (prefs_->HasPrefPath(prefs::kContentSettingsClearOnExitMigrated) &&
526      prefs_->GetBoolean(prefs::kContentSettingsClearOnExitMigrated)) {
527    return;
528  }
529
530  if (!prefs_->GetBoolean(prefs::kClearSiteDataOnExit)) {
531    // Nothing to be done
532    prefs_->SetBoolean(prefs::kContentSettingsClearOnExitMigrated, true);
533    return;
534  }
535
536  // Change the default cookie settings:
537  //  old              new
538  //  ---------------- ----------------
539  //  ALLOW            SESSION_ONLY
540  //  SESSION_ONLY     SESSION_ONLY
541  //  BLOCK            BLOCK
542  ContentSetting default_setting = GetDefaultContentSettingFromProvider(
543      CONTENT_SETTINGS_TYPE_COOKIES,
544      content_settings_providers_[DEFAULT_PROVIDER]);
545  if (default_setting == CONTENT_SETTING_ALLOW) {
546    SetDefaultContentSetting(
547        CONTENT_SETTINGS_TYPE_COOKIES, CONTENT_SETTING_SESSION_ONLY);
548  }
549
550  // Change the exceptions using the same rules.
551  ContentSettingsForOneType exceptions;
552  AddSettingsForOneType(content_settings_providers_[PREF_PROVIDER],
553                        PREF_PROVIDER,
554                        CONTENT_SETTINGS_TYPE_COOKIES,
555                        std::string(),
556                        &exceptions,
557                        false);
558  for (ContentSettingsForOneType::iterator it = exceptions.begin();
559       it != exceptions.end(); ++it) {
560    if (it->setting != CONTENT_SETTING_ALLOW)
561      continue;
562    SetWebsiteSetting(it->primary_pattern,
563                      it->secondary_pattern,
564                      CONTENT_SETTINGS_TYPE_COOKIES,
565                      std::string(),
566                      base::Value::CreateIntegerValue(
567                          CONTENT_SETTING_SESSION_ONLY));
568  }
569
570  prefs_->SetBoolean(prefs::kContentSettingsClearOnExitMigrated, true);
571}
572
573void HostContentSettingsMap::AddSettingsForOneType(
574    const content_settings::ProviderInterface* provider,
575    ProviderType provider_type,
576    ContentSettingsType content_type,
577    const std::string& resource_identifier,
578    ContentSettingsForOneType* settings,
579    bool incognito) const {
580  scoped_ptr<content_settings::RuleIterator> rule_iterator(
581      provider->GetRuleIterator(content_type,
582                                resource_identifier,
583                                incognito));
584  while (rule_iterator->HasNext()) {
585    const content_settings::Rule& rule = rule_iterator->Next();
586    ContentSetting setting_value = CONTENT_SETTING_DEFAULT;
587    // TODO(bauerb): Return rules as a list of values, not content settings.
588    // Handle the case using compound values for its exceptions and arbitrary
589    // values for its default setting. Here we assume all the exceptions
590    // are granted as |CONTENT_SETTING_ALLOW|.
591    if (ContentTypeHasCompoundValue(content_type) &&
592        rule.value.get() &&
593        rule.primary_pattern != ContentSettingsPattern::Wildcard()) {
594      setting_value = CONTENT_SETTING_ALLOW;
595    } else {
596      setting_value = content_settings::ValueToContentSetting(rule.value.get());
597    }
598    settings->push_back(ContentSettingPatternSource(
599        rule.primary_pattern, rule.secondary_pattern,
600        setting_value,
601        kProviderNames[provider_type],
602        incognito));
603  }
604}
605
606void HostContentSettingsMap::UsedContentSettingsProviders() const {
607#ifndef NDEBUG
608  if (used_from_thread_id_ == base::kInvalidThreadId)
609    return;
610
611  if (base::PlatformThread::CurrentId() != used_from_thread_id_)
612    used_from_thread_id_ = base::kInvalidThreadId;
613#endif
614}
615
616bool HostContentSettingsMap::ShouldAllowAllContent(
617    const GURL& primary_url,
618    const GURL& secondary_url,
619    ContentSettingsType content_type) {
620  if (content_type == CONTENT_SETTINGS_TYPE_NOTIFICATIONS ||
621      content_type == CONTENT_SETTINGS_TYPE_GEOLOCATION ||
622      content_type == CONTENT_SETTINGS_TYPE_MIDI_SYSEX) {
623    return false;
624  }
625#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
626  if (content_type == CONTENT_SETTINGS_TYPE_PROTECTED_MEDIA_IDENTIFIER) {
627    return false;
628  }
629#endif
630  if (secondary_url.SchemeIs(content::kChromeUIScheme) &&
631      content_type == CONTENT_SETTINGS_TYPE_COOKIES &&
632      primary_url.SchemeIsSecure()) {
633    return true;
634  }
635  if (primary_url.SchemeIs(extensions::kExtensionScheme)) {
636    switch (content_type) {
637      case CONTENT_SETTINGS_TYPE_PLUGINS:
638      case CONTENT_SETTINGS_TYPE_MEDIASTREAM:
639      case CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC:
640      case CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA:
641        return false;
642      case CONTENT_SETTINGS_TYPE_COOKIES:
643        return secondary_url.SchemeIs(extensions::kExtensionScheme);
644      default:
645        return true;
646    }
647  }
648  return primary_url.SchemeIs(content::kChromeDevToolsScheme) ||
649         primary_url.SchemeIs(content::kChromeUIScheme);
650}
651
652base::Value* HostContentSettingsMap::GetWebsiteSetting(
653    const GURL& primary_url,
654    const GURL& secondary_url,
655    ContentSettingsType content_type,
656    const std::string& resource_identifier,
657    content_settings::SettingInfo* info) const {
658  DCHECK(SupportsResourceIdentifier(content_type) ||
659         resource_identifier.empty());
660
661  // Check if the scheme of the requesting url is whitelisted.
662  if (ShouldAllowAllContent(primary_url, secondary_url, content_type)) {
663    if (info) {
664      info->source = content_settings::SETTING_SOURCE_WHITELIST;
665      info->primary_pattern = ContentSettingsPattern::Wildcard();
666      info->secondary_pattern = ContentSettingsPattern::Wildcard();
667    }
668    return base::Value::CreateIntegerValue(CONTENT_SETTING_ALLOW);
669  }
670
671  ContentSettingsPattern* primary_pattern = NULL;
672  ContentSettingsPattern* secondary_pattern = NULL;
673  if (info) {
674    primary_pattern = &info->primary_pattern;
675    secondary_pattern = &info->secondary_pattern;
676  }
677
678  // The list of |content_settings_providers_| is ordered according to their
679  // precedence.
680  for (ConstProviderIterator provider = content_settings_providers_.begin();
681       provider != content_settings_providers_.end();
682       ++provider) {
683    base::Value* value = content_settings::GetContentSettingValueAndPatterns(
684        provider->second, primary_url, secondary_url, content_type,
685        resource_identifier, is_off_the_record_,
686        primary_pattern, secondary_pattern);
687    if (value) {
688      if (info)
689        info->source = kProviderSourceMap[provider->first];
690      return value;
691    }
692  }
693
694  if (info) {
695    info->source = content_settings::SETTING_SOURCE_NONE;
696    info->primary_pattern = ContentSettingsPattern();
697    info->secondary_pattern = ContentSettingsPattern();
698  }
699  return NULL;
700}
701
702// static
703HostContentSettingsMap::ProviderType
704    HostContentSettingsMap::GetProviderTypeFromSource(
705        const std::string& source) {
706  for (size_t i = 0; i < arraysize(kProviderNames); ++i) {
707    if (source == kProviderNames[i])
708      return static_cast<ProviderType>(i);
709  }
710
711  NOTREACHED();
712  return DEFAULT_PROVIDER;
713}
714
715content_settings::PrefProvider* HostContentSettingsMap::GetPrefProvider() {
716  return static_cast<content_settings::PrefProvider*>(
717      content_settings_providers_[PREF_PROVIDER]);
718}
719