chrome/common/extensions/features/manifest_feature.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 "chrome/common/extensions/features/manifest_feature.h"
   6
   7 #include "extensions/common/manifest.h"
   8
   9 namespace extensions {
  10
  11 ManifestFeature::ManifestFeature() {
  12 }
  13
  14 ManifestFeature::~ManifestFeature() {
  15 }
  16
  17 Feature::Availability ManifestFeature::IsAvailableToContext(
  18     const Extension* extension,
  19     Feature::Context context,
  20     const GURL& url,
  21     Feature::Platform platform) const {
  22   Availability availability = SimpleFeature::IsAvailableToContext(extension,
  23                                                                   context,
  24                                                                   url,
  25                                                                   platform);
  26   if (!availability.is_available())
  27     return availability;
  28
  29   // We know we can skip manifest()->GetKey() here because we just did the same
  30   // validation it would do above.
  31   if (extension && !extension->manifest()->value()->HasKey(name()))
  32     return CreateAvailability(NOT_PRESENT, extension->GetType());
  33
  34   return CreateAvailability(IS_AVAILABLE);
  35 }
  36
  37 std::string ManifestFeature::Parse(const base::DictionaryValue* value) {
  38   std::string error = SimpleFeature::Parse(value);
  39   if (!error.empty())
  40     return error;
  41
  42   if (extension_types()->empty()) {
  43     return name() + ": Manifest features must specify at least one " +
  44         "value for extension_types.";
  45   }
  46
  47   if (!GetContexts()->empty())
  48     return name() + ": Manifest features do not support contexts.";
  49
  50   return std::string();
  51 }
  52
  53 }  // namespace extensions