extensions/browser/api/declarative/rules_registry.cc

   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 "extensions/browser/api/declarative/rules_registry.h"
   6
   7 #include <utility>
   8
   9 #include "base/bind.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/stl_util.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/time/time.h"
  17 #include "base/values.h"
  18 #include "content/public/browser/browser_thread.h"
  19 #include "content/public/browser/notification_details.h"
  20 #include "content/public/browser/notification_source.h"
  21 #include "extensions/browser/api/declarative/rules_cache_delegate.h"
  22 #include "extensions/browser/extension_error.h"
  23 #include "extensions/browser/extension_prefs.h"
  24 #include "extensions/browser/extension_system.h"
  25 #include "extensions/browser/extensions_browser_client.h"
  26 #include "extensions/browser/state_store.h"
  27 #include "extensions/common/api/declarative/declarative_manifest_data.h"
  28 #include "extensions/common/extension.h"
  29 #include "extensions/common/extensions_client.h"
  30 #include "extensions/common/manifest_constants.h"
  31
  32 namespace extensions {
  33
  34 namespace {
  35
  36 const char kSuccess[] = "";
  37 const char kDuplicateRuleId[] = "Duplicate rule ID: %s";
  38 const char kErrorCannotRemoveManifestRules[] =
  39     "Rules declared in the 'event_rules' manifest field cannot be removed";
  40
  41 scoped_ptr<base::Value> RulesToValue(
  42     const std::vector<linked_ptr<api::events::Rule>>& rules) {
  43   scoped_ptr<base::ListValue> list(new base::ListValue());
  44   for (size_t i = 0; i < rules.size(); ++i)
  45     list->Append(rules[i]->ToValue().release());
  46   return list.Pass();
  47 }
  48
  49 std::vector<linked_ptr<api::events::Rule>> RulesFromValue(
  50     const base::Value* value) {
  51   std::vector<linked_ptr<api::events::Rule>> rules;
  52
  53   const base::ListValue* list = NULL;
  54   if (!value || !value->GetAsList(&list))
  55     return rules;
  56
  57   rules.reserve(list->GetSize());
  58   for (size_t i = 0; i < list->GetSize(); ++i) {
  59     const base::DictionaryValue* dict = NULL;
  60     if (!list->GetDictionary(i, &dict))
  61       continue;
  62     linked_ptr<api::events::Rule> rule(new api::events::Rule());
  63     if (api::events::Rule::Populate(*dict, rule.get()))
  64       rules.push_back(rule);
  65   }
  66
  67   return rules;
  68 }
  69
  70 std::string ToId(int identifier) {
  71   return base::StringPrintf("_%d_", identifier);
  72 }
  73
  74 }  // namespace
  75
  76
  77 // RulesRegistry
  78
  79 RulesRegistry::RulesRegistry(content::BrowserContext* browser_context,
  80                              const std::string& event_name,
  81                              content::BrowserThread::ID owner_thread,
  82                              RulesCacheDelegate* cache_delegate,
  83                              int id)
  84     : browser_context_(browser_context),
  85       owner_thread_(owner_thread),
  86       event_name_(event_name),
  87       id_(id),
  88       ready_(/*signaled=*/!cache_delegate),  // Immediately ready if no cache
  89                                              // delegate to wait for.
  90       last_generated_rule_identifier_id_(0),
  91       weak_ptr_factory_(browser_context_ ? this : NULL) {
  92   if (cache_delegate) {
  93     cache_delegate_ = cache_delegate->GetWeakPtr();
  94     cache_delegate->Init(this);
  95   }
  96 }
  97
  98 std::string RulesRegistry::AddRulesNoFill(
  99     const std::string& extension_id,
 100     const std::vector<linked_ptr<api::events::Rule>>& rules,
 101     RulesDictionary* out) {
 102   DCHECK_CURRENTLY_ON(owner_thread());
 103
 104   // Verify that all rule IDs are new.
 105   for (std::vector<linked_ptr<api::events::Rule>>::const_iterator i =
 106            rules.begin();
 107        i != rules.end(); ++i) {
 108     const RuleId& rule_id = *((*i)->id);
 109     // Every rule should have a priority assigned.
 110     DCHECK((*i)->priority);
 111     RulesDictionaryKey key(extension_id, rule_id);
 112     if (rules_.find(key) != rules_.end() ||
 113         manifest_rules_.find(key) != manifest_rules_.end())
 114       return base::StringPrintf(kDuplicateRuleId, rule_id.c_str());
 115   }
 116
 117   std::string error = AddRulesImpl(extension_id, rules);
 118
 119   if (!error.empty())
 120     return error;
 121
 122   // Commit all rules into |rules_| on success.
 123   for (std::vector<linked_ptr<api::events::Rule>>::const_iterator i =
 124            rules.begin();
 125        i != rules.end(); ++i) {
 126     const RuleId& rule_id = *((*i)->id);
 127     RulesDictionaryKey key(extension_id, rule_id);
 128     (*out)[key] = *i;
 129   }
 130
 131   MaybeProcessChangedRules(extension_id);
 132   return kSuccess;
 133 }
 134
 135 std::string RulesRegistry::AddRules(
 136     const std::string& extension_id,
 137     const std::vector<linked_ptr<api::events::Rule>>& rules) {
 138   return AddRulesInternal(extension_id, rules, &rules_);
 139 }
 140
 141 std::string RulesRegistry::AddRulesInternal(
 142     const std::string& extension_id,
 143     const std::vector<linked_ptr<api::events::Rule>>& rules,
 144     RulesDictionary* out) {
 145   DCHECK_CURRENTLY_ON(owner_thread());
 146
 147   std::string error = CheckAndFillInOptionalRules(extension_id, rules);
 148   if (!error.empty())
 149     return error;
 150   FillInOptionalPriorities(rules);
 151
 152   return AddRulesNoFill(extension_id, rules, out);
 153 }
 154
 155 std::string RulesRegistry::RemoveRules(
 156     const std::string& extension_id,
 157     const std::vector<std::string>& rule_identifiers) {
 158   DCHECK_CURRENTLY_ON(owner_thread());
 159
 160   // Check if any of the rules are non-removable.
 161   for (RuleId rule_id : rule_identifiers) {
 162     RulesDictionaryKey lookup_key(extension_id, rule_id);
 163     RulesDictionary::iterator itr = manifest_rules_.find(lookup_key);
 164     if (itr != manifest_rules_.end())
 165       return kErrorCannotRemoveManifestRules;
 166   }
 167
 168   std::string error = RemoveRulesImpl(extension_id, rule_identifiers);
 169
 170   if (!error.empty())
 171     return error;
 172
 173   for (std::vector<std::string>::const_iterator i = rule_identifiers.begin();
 174        i != rule_identifiers.end();
 175        ++i) {
 176     RulesDictionaryKey lookup_key(extension_id, *i);
 177     rules_.erase(lookup_key);
 178   }
 179
 180   MaybeProcessChangedRules(extension_id);
 181   RemoveUsedRuleIdentifiers(extension_id, rule_identifiers);
 182   return kSuccess;
 183 }
 184
 185 std::string RulesRegistry::RemoveAllRules(const std::string& extension_id) {
 186   std::string result =
 187       RulesRegistry::RemoveAllRulesNoStoreUpdate(extension_id, false);
 188   MaybeProcessChangedRules(extension_id);  // Now update the prefs and store.
 189   return result;
 190 }
 191
 192 std::string RulesRegistry::RemoveAllRulesNoStoreUpdate(
 193     const std::string& extension_id,
 194     bool remove_manifest_rules) {
 195   DCHECK_CURRENTLY_ON(owner_thread());
 196
 197   std::string error = RemoveAllRulesImpl(extension_id);
 198
 199   if (!error.empty())
 200     return error;
 201
 202   auto remove_rules = [&extension_id](RulesDictionary& dictionary) {
 203     for (auto it = dictionary.begin(); it != dictionary.end();) {
 204       if (it->first.first == extension_id)
 205         dictionary.erase(it++);
 206       else
 207         ++it;
 208     }
 209   };
 210   remove_rules(rules_);
 211   if (remove_manifest_rules)
 212     remove_rules(manifest_rules_);
 213
 214   RemoveAllUsedRuleIdentifiers(extension_id);
 215   return kSuccess;
 216 }
 217
 218 void RulesRegistry::GetRules(const std::string& extension_id,
 219                              const std::vector<std::string>& rule_identifiers,
 220                              std::vector<linked_ptr<api::events::Rule>>* out) {
 221   DCHECK_CURRENTLY_ON(owner_thread());
 222
 223   for (const auto& i : rule_identifiers) {
 224     RulesDictionaryKey lookup_key(extension_id, i);
 225     RulesDictionary::iterator entry = rules_.find(lookup_key);
 226     if (entry != rules_.end())
 227       out->push_back(entry->second);
 228     entry = manifest_rules_.find(lookup_key);
 229     if (entry != manifest_rules_.end())
 230       out->push_back(entry->second);
 231   }
 232 }
 233
 234 void RulesRegistry::GetRules(const std::string& extension_id,
 235                              RulesDictionary& rules,
 236                              std::vector<linked_ptr<api::events::Rule>>* out) {
 237   for (const auto& i : rules) {
 238     const RulesDictionaryKey& key = i.first;
 239     if (key.first == extension_id)
 240       out->push_back(i.second);
 241   }
 242 }
 243
 244 void RulesRegistry::GetAllRules(
 245     const std::string& extension_id,
 246     std::vector<linked_ptr<api::events::Rule>>* out) {
 247   DCHECK_CURRENTLY_ON(owner_thread());
 248   GetRules(extension_id, manifest_rules_, out);
 249   GetRules(extension_id, rules_, out);
 250 }
 251
 252 void RulesRegistry::OnExtensionUnloaded(const Extension* extension) {
 253   DCHECK_CURRENTLY_ON(owner_thread());
 254   std::string error = RemoveAllRulesImpl(extension->id());
 255   if (!error.empty())
 256     ReportInternalError(extension->id(), error);
 257 }
 258
 259 void RulesRegistry::OnExtensionUninstalled(const Extension* extension) {
 260   DCHECK_CURRENTLY_ON(owner_thread());
 261   std::string error = RemoveAllRulesNoStoreUpdate(extension->id(), true);
 262   if (!error.empty())
 263     ReportInternalError(extension->id(), error);
 264 }
 265
 266 void RulesRegistry::OnExtensionLoaded(const Extension* extension) {
 267   DCHECK_CURRENTLY_ON(owner_thread());
 268   std::vector<linked_ptr<api::events::Rule>> rules;
 269   GetAllRules(extension->id(), &rules);
 270   DeclarativeManifestData* declarative_data =
 271       DeclarativeManifestData::Get(extension);
 272   if (declarative_data) {
 273     std::vector<linked_ptr<api::events::Rule>>& manifest_rules =
 274         declarative_data->RulesForEvent(event_name_);
 275     if (manifest_rules.size()) {
 276       std::string error =
 277           AddRulesInternal(extension->id(), manifest_rules, &manifest_rules_);
 278       if (!error.empty())
 279         ReportInternalError(extension->id(), error);
 280     }
 281   }
 282   std::string error = AddRulesImpl(extension->id(), rules);
 283   if (!error.empty())
 284     ReportInternalError(extension->id(), error);
 285 }
 286
 287 size_t RulesRegistry::GetNumberOfUsedRuleIdentifiersForTesting() const {
 288   size_t entry_count = 0u;
 289   for (RuleIdentifiersMap::const_iterator extension =
 290            used_rule_identifiers_.begin();
 291        extension != used_rule_identifiers_.end();
 292        ++extension) {
 293     // Each extension is counted as 1 just for being there. Otherwise we miss
 294     // keys with empty values.
 295     entry_count += 1u + extension->second.size();
 296   }
 297   return entry_count;
 298 }
 299
 300 void RulesRegistry::DeserializeAndAddRules(
 301     const std::string& extension_id,
 302     scoped_ptr<base::Value> rules) {
 303   DCHECK_CURRENTLY_ON(owner_thread());
 304
 305   std::string error =
 306       AddRulesNoFill(extension_id, RulesFromValue(rules.get()), &rules_);
 307   if (!error.empty())
 308     ReportInternalError(extension_id, error);
 309 }
 310
 311 void RulesRegistry::ReportInternalError(const std::string& extension_id,
 312                                         const std::string& error) {
 313   scoped_ptr<ExtensionError> error_instance(new InternalError(
 314       extension_id, base::ASCIIToUTF16(error), logging::LOG_ERROR));
 315   ExtensionsBrowserClient::Get()->ReportError(browser_context_,
 316                                               error_instance.Pass());
 317 }
 318
 319 RulesRegistry::~RulesRegistry() {
 320 }
 321
 322 void RulesRegistry::MarkReady(base::Time storage_init_time) {
 323   DCHECK_CURRENTLY_ON(owner_thread());
 324
 325   if (!storage_init_time.is_null()) {
 326     UMA_HISTOGRAM_TIMES("Extensions.DeclarativeRulesStorageInitialization",
 327                         base::Time::Now() - storage_init_time);
 328   }
 329
 330   ready_.Signal();
 331 }
 332
 333 void RulesRegistry::ProcessChangedRules(const std::string& extension_id) {
 334   DCHECK_CURRENTLY_ON(owner_thread());
 335
 336   DCHECK(ContainsKey(process_changed_rules_requested_, extension_id));
 337   process_changed_rules_requested_[extension_id] = NOT_SCHEDULED_FOR_PROCESSING;
 338
 339   std::vector<linked_ptr<api::events::Rule>> new_rules;
 340   GetRules(extension_id, rules_, &new_rules);
 341   content::BrowserThread::PostTask(
 342       content::BrowserThread::UI, FROM_HERE,
 343       base::Bind(&RulesCacheDelegate::WriteToStorage, cache_delegate_,
 344                  extension_id, base::Passed(RulesToValue(new_rules))));
 345 }
 346
 347 void RulesRegistry::MaybeProcessChangedRules(const std::string& extension_id) {
 348   // Read and initialize |process_changed_rules_requested_[extension_id]| if
 349   // necessary. (Note that the insertion below will not overwrite
 350   // |process_changed_rules_requested_[extension_id]| if that already exists.
 351   std::pair<ProcessStateMap::iterator, bool> insertion =
 352       process_changed_rules_requested_.insert(std::make_pair(
 353           extension_id,
 354           browser_context_ ? NOT_SCHEDULED_FOR_PROCESSING : NEVER_PROCESS));
 355   if (insertion.first->second != NOT_SCHEDULED_FOR_PROCESSING)
 356     return;
 357
 358   process_changed_rules_requested_[extension_id] = SCHEDULED_FOR_PROCESSING;
 359   ready_.Post(FROM_HERE,
 360               base::Bind(&RulesRegistry::ProcessChangedRules,
 361                          weak_ptr_factory_.GetWeakPtr(),
 362                          extension_id));
 363 }
 364
 365 bool RulesRegistry::IsUniqueId(const std::string& extension_id,
 366                                const std::string& rule_id) const {
 367   RuleIdentifiersMap::const_iterator identifiers =
 368       used_rule_identifiers_.find(extension_id);
 369   if (identifiers == used_rule_identifiers_.end())
 370     return true;
 371   return identifiers->second.find(rule_id) == identifiers->second.end();
 372 }
 373
 374 std::string RulesRegistry::GenerateUniqueId(const std::string& extension_id) {
 375   while (!IsUniqueId(extension_id, ToId(last_generated_rule_identifier_id_)))
 376     ++last_generated_rule_identifier_id_;
 377   return ToId(last_generated_rule_identifier_id_);
 378 }
 379
 380 std::string RulesRegistry::CheckAndFillInOptionalRules(
 381     const std::string& extension_id,
 382     const std::vector<linked_ptr<api::events::Rule>>& rules) {
 383   // IDs we have inserted, in case we need to rollback this operation.
 384   std::vector<std::string> rollback_log;
 385
 386   // First we insert all rules with existing identifier, so that generated
 387   // identifiers cannot collide with identifiers passed by the caller.
 388   for (std::vector<linked_ptr<api::events::Rule>>::const_iterator i =
 389            rules.begin();
 390        i != rules.end(); ++i) {
 391     api::events::Rule* rule = i->get();
 392     if (rule->id.get()) {
 393       std::string id = *(rule->id);
 394       if (!IsUniqueId(extension_id, id)) {
 395         RemoveUsedRuleIdentifiers(extension_id, rollback_log);
 396         return "Id " + id + " was used multiple times.";
 397       }
 398       used_rule_identifiers_[extension_id].insert(id);
 399     }
 400   }
 401   // Now we generate IDs in case they were not specified in the rules. This
 402   // cannot fail so we do not need to keep track of a rollback log.
 403   for (std::vector<linked_ptr<api::events::Rule>>::const_iterator i =
 404            rules.begin();
 405        i != rules.end(); ++i) {
 406     api::events::Rule* rule = i->get();
 407     if (!rule->id.get()) {
 408       rule->id.reset(new std::string(GenerateUniqueId(extension_id)));
 409       used_rule_identifiers_[extension_id].insert(*(rule->id));
 410     }
 411   }
 412   return std::string();
 413 }
 414
 415 void RulesRegistry::FillInOptionalPriorities(
 416     const std::vector<linked_ptr<api::events::Rule>>& rules) {
 417   std::vector<linked_ptr<api::events::Rule>>::const_iterator i;
 418   for (i = rules.begin(); i != rules.end(); ++i) {
 419     if (!(*i)->priority.get())
 420       (*i)->priority.reset(new int(DEFAULT_PRIORITY));
 421   }
 422 }
 423
 424 void RulesRegistry::RemoveUsedRuleIdentifiers(
 425     const std::string& extension_id,
 426     const std::vector<std::string>& identifiers) {
 427   std::vector<std::string>::const_iterator i;
 428   for (i = identifiers.begin(); i != identifiers.end(); ++i)
 429     used_rule_identifiers_[extension_id].erase(*i);
 430 }
 431
 432 void RulesRegistry::RemoveAllUsedRuleIdentifiers(
 433     const std::string& extension_id) {
 434   used_rule_identifiers_.erase(extension_id);
 435 }
 436
 437 }  // namespace extensions