src/extensions/browser/api/storage/storage_api.cc

   1 // Copyright 2014 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/storage/storage_api.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/values.h"
  13 #include "content/public/browser/browser_thread.h"
  14 #include "extensions/browser/api/storage/storage_frontend.h"
  15 #include "extensions/browser/quota_service.h"
  16 #include "extensions/common/api/storage.h"
  17
  18 namespace extensions {
  19
  20 using content::BrowserThread;
  21
  22 // SettingsFunction
  23
  24 SettingsFunction::SettingsFunction()
  25     : settings_namespace_(settings_namespace::INVALID),
  26       tried_restoring_storage_(false) {}
  27
  28 SettingsFunction::~SettingsFunction() {}
  29
  30 bool SettingsFunction::ShouldSkipQuotaLimiting() const {
  31   // Only apply quota if this is for sync storage.
  32   std::string settings_namespace_string;
  33   if (!args_->GetString(0, &settings_namespace_string)) {
  34     // This should be EXTENSION_FUNCTION_VALIDATE(false) but there is no way
  35     // to signify that from this function. It will be caught in Run().
  36     return false;
  37   }
  38   return settings_namespace_string != "sync";
  39 }
  40
  41 ExtensionFunction::ResponseAction SettingsFunction::Run() {
  42   std::string settings_namespace_string;
  43   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &settings_namespace_string));
  44   args_->Remove(0, NULL);
  45   settings_namespace_ =
  46       settings_namespace::FromString(settings_namespace_string);
  47   EXTENSION_FUNCTION_VALIDATE(settings_namespace_ !=
  48                               settings_namespace::INVALID);
  49
  50   StorageFrontend* frontend = StorageFrontend::Get(browser_context());
  51   if (!frontend->IsStorageEnabled(settings_namespace_)) {
  52     return RespondNow(Error(
  53         base::StringPrintf("\"%s\" is not available in this instance of Chrome",
  54                            settings_namespace_string.c_str())));
  55   }
  56
  57   observers_ = frontend->GetObservers();
  58   frontend->RunWithStorage(
  59       extension(),
  60       settings_namespace_,
  61       base::Bind(&SettingsFunction::AsyncRunWithStorage, this));
  62   return RespondLater();
  63 }
  64
  65 void SettingsFunction::AsyncRunWithStorage(ValueStore* storage) {
  66   ResponseValue response = RunWithStorage(storage);
  67   BrowserThread::PostTask(
  68       BrowserThread::UI,
  69       FROM_HERE,
  70       base::Bind(&SettingsFunction::Respond, this, base::Passed(&response)));
  71 }
  72
  73 ExtensionFunction::ResponseValue SettingsFunction::UseReadResult(
  74     ValueStore::ReadResult result,
  75     ValueStore* storage) {
  76   if (result->HasError())
  77     return HandleError(result->error(), storage);
  78
  79   base::DictionaryValue* dict = new base::DictionaryValue();
  80   dict->Swap(&result->settings());
  81   return OneArgument(dict);
  82 }
  83
  84 ExtensionFunction::ResponseValue SettingsFunction::UseWriteResult(
  85     ValueStore::WriteResult result,
  86     ValueStore* storage) {
  87   if (result->HasError())
  88     return HandleError(result->error(), storage);
  89
  90   if (!result->changes().empty()) {
  91     observers_->Notify(
  92         &SettingsObserver::OnSettingsChanged,
  93         extension_id(),
  94         settings_namespace_,
  95         ValueStoreChange::ToJson(result->changes()));
  96   }
  97
  98   return NoArguments();
  99 }
 100
 101 ExtensionFunction::ResponseValue SettingsFunction::HandleError(
 102     const ValueStore::Error& error,
 103     ValueStore* storage) {
 104   // If the method failed due to corruption, and we haven't tried to fix it, we
 105   // can try to restore the storage and re-run it. Otherwise, the method has
 106   // failed.
 107   if (error.code == ValueStore::CORRUPTION && !tried_restoring_storage_) {
 108     tried_restoring_storage_ = true;
 109
 110     // If the corruption is on a particular key, try to restore that key and
 111     // re-run.
 112     if (error.key.get() && storage->RestoreKey(*error.key))
 113       return RunWithStorage(storage);
 114
 115     // If the full database is corrupted, try to restore the whole thing and
 116     // re-run.
 117     if (storage->Restore())
 118       return RunWithStorage(storage);
 119   }
 120
 121   return Error(error.message);
 122 }
 123
 124 // Concrete settings functions
 125
 126 namespace {
 127
 128 // Adds all StringValues from a ListValue to a vector of strings.
 129 void AddAllStringValues(const base::ListValue& from,
 130                         std::vector<std::string>* to) {
 131   DCHECK(to->empty());
 132   std::string as_string;
 133   for (base::ListValue::const_iterator it = from.begin();
 134        it != from.end(); ++it) {
 135     if ((*it)->GetAsString(&as_string)) {
 136       to->push_back(as_string);
 137     }
 138   }
 139 }
 140
 141 // Gets the keys of a DictionaryValue.
 142 std::vector<std::string> GetKeys(const base::DictionaryValue& dict) {
 143   std::vector<std::string> keys;
 144   for (base::DictionaryValue::Iterator it(dict); !it.IsAtEnd(); it.Advance()) {
 145     keys.push_back(it.key());
 146   }
 147   return keys;
 148 }
 149
 150 // Creates quota heuristics for settings modification.
 151 void GetModificationQuotaLimitHeuristics(QuotaLimitHeuristics* heuristics) {
 152   // See storage.json for the current value of these limits.
 153   QuotaLimitHeuristic::Config short_limit_config = {
 154       core_api::storage::sync::MAX_WRITE_OPERATIONS_PER_MINUTE,
 155       base::TimeDelta::FromMinutes(1)};
 156   QuotaLimitHeuristic::Config long_limit_config = {
 157       core_api::storage::sync::MAX_WRITE_OPERATIONS_PER_HOUR,
 158       base::TimeDelta::FromHours(1)};
 159   heuristics->push_back(new QuotaService::TimedLimit(
 160       short_limit_config, new QuotaLimitHeuristic::SingletonBucketMapper(),
 161       "MAX_WRITE_OPERATIONS_PER_MINUTE"));
 162   heuristics->push_back(new QuotaService::TimedLimit(
 163       long_limit_config, new QuotaLimitHeuristic::SingletonBucketMapper(),
 164       "MAX_WRITE_OPERATIONS_PER_HOUR"));
 165 };
 166
 167 }  // namespace
 168
 169 ExtensionFunction::ResponseValue StorageStorageAreaGetFunction::RunWithStorage(
 170     ValueStore* storage) {
 171   base::Value* input = NULL;
 172   if (!args_->Get(0, &input))
 173     return BadMessage();
 174
 175   switch (input->GetType()) {
 176     case base::Value::TYPE_NULL:
 177       return UseReadResult(storage->Get(), storage);
 178
 179     case base::Value::TYPE_STRING: {
 180       std::string as_string;
 181       input->GetAsString(&as_string);
 182       return UseReadResult(storage->Get(as_string), storage);
 183     }
 184
 185     case base::Value::TYPE_LIST: {
 186       std::vector<std::string> as_string_list;
 187       AddAllStringValues(*static_cast<base::ListValue*>(input),
 188                          &as_string_list);
 189       return UseReadResult(storage->Get(as_string_list), storage);
 190     }
 191
 192     case base::Value::TYPE_DICTIONARY: {
 193       base::DictionaryValue* as_dict =
 194           static_cast<base::DictionaryValue*>(input);
 195       ValueStore::ReadResult result = storage->Get(GetKeys(*as_dict));
 196       if (result->HasError()) {
 197         return UseReadResult(result.Pass(), storage);
 198       }
 199
 200       base::DictionaryValue* with_default_values = as_dict->DeepCopy();
 201       with_default_values->MergeDictionary(&result->settings());
 202       return UseReadResult(
 203           ValueStore::MakeReadResult(make_scoped_ptr(with_default_values)),
 204           storage);
 205     }
 206
 207     default:
 208       return BadMessage();
 209   }
 210 }
 211
 212 ExtensionFunction::ResponseValue
 213 StorageStorageAreaGetBytesInUseFunction::RunWithStorage(ValueStore* storage) {
 214   base::Value* input = NULL;
 215   if (!args_->Get(0, &input))
 216     return BadMessage();
 217
 218   size_t bytes_in_use = 0;
 219
 220   switch (input->GetType()) {
 221     case base::Value::TYPE_NULL:
 222       bytes_in_use = storage->GetBytesInUse();
 223       break;
 224
 225     case base::Value::TYPE_STRING: {
 226       std::string as_string;
 227       input->GetAsString(&as_string);
 228       bytes_in_use = storage->GetBytesInUse(as_string);
 229       break;
 230     }
 231
 232     case base::Value::TYPE_LIST: {
 233       std::vector<std::string> as_string_list;
 234       AddAllStringValues(*static_cast<base::ListValue*>(input),
 235                          &as_string_list);
 236       bytes_in_use = storage->GetBytesInUse(as_string_list);
 237       break;
 238     }
 239
 240     default:
 241       return BadMessage();
 242   }
 243
 244   return OneArgument(
 245       new base::FundamentalValue(static_cast<int>(bytes_in_use)));
 246 }
 247
 248 ExtensionFunction::ResponseValue StorageStorageAreaSetFunction::RunWithStorage(
 249     ValueStore* storage) {
 250   base::DictionaryValue* input = NULL;
 251   if (!args_->GetDictionary(0, &input))
 252     return BadMessage();
 253   return UseWriteResult(storage->Set(ValueStore::DEFAULTS, *input), storage);
 254 }
 255
 256 void StorageStorageAreaSetFunction::GetQuotaLimitHeuristics(
 257     QuotaLimitHeuristics* heuristics) const {
 258   GetModificationQuotaLimitHeuristics(heuristics);
 259 }
 260
 261 ExtensionFunction::ResponseValue
 262 StorageStorageAreaRemoveFunction::RunWithStorage(ValueStore* storage) {
 263   base::Value* input = NULL;
 264   if (!args_->Get(0, &input))
 265     return BadMessage();
 266
 267   switch (input->GetType()) {
 268     case base::Value::TYPE_STRING: {
 269       std::string as_string;
 270       input->GetAsString(&as_string);
 271       return UseWriteResult(storage->Remove(as_string), storage);
 272     }
 273
 274     case base::Value::TYPE_LIST: {
 275       std::vector<std::string> as_string_list;
 276       AddAllStringValues(*static_cast<base::ListValue*>(input),
 277                          &as_string_list);
 278       return UseWriteResult(storage->Remove(as_string_list), storage);
 279     }
 280
 281     default:
 282       return BadMessage();
 283   };
 284 }
 285
 286 void StorageStorageAreaRemoveFunction::GetQuotaLimitHeuristics(
 287     QuotaLimitHeuristics* heuristics) const {
 288   GetModificationQuotaLimitHeuristics(heuristics);
 289 }
 290
 291 ExtensionFunction::ResponseValue
 292 StorageStorageAreaClearFunction::RunWithStorage(ValueStore* storage) {
 293   return UseWriteResult(storage->Clear(), storage);
 294 }
 295
 296 void StorageStorageAreaClearFunction::GetQuotaLimitHeuristics(
 297     QuotaLimitHeuristics* heuristics) const {
 298   GetModificationQuotaLimitHeuristics(heuristics);
 299 }
 300
 301 }  // namespace extensions