extensions/common/manifest_handlers/requirements_info.cc

   1 // Copyright 2013 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/common/manifest_handlers/requirements_info.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "base/values.h"
  11 #include "extensions/common/error_utils.h"
  12 #include "extensions/common/manifest_constants.h"
  13
  14 namespace extensions {
  15
  16 namespace keys = manifest_keys;
  17 namespace errors = manifest_errors;
  18
  19 RequirementsInfo::RequirementsInfo(const Manifest* manifest)
  20     : webgl(false),
  21       npapi(false),
  22       window_shape(false) {
  23   // Before parsing requirements from the manifest, automatically default the
  24   // NPAPI plugin requirement based on whether it includes NPAPI plugins.
  25   const base::ListValue* list_value = NULL;
  26   npapi = manifest->GetList(keys::kPlugins, &list_value) &&
  27           !list_value->empty();
  28 }
  29
  30 RequirementsInfo::~RequirementsInfo() {
  31 }
  32
  33 // static
  34 const RequirementsInfo& RequirementsInfo::GetRequirements(
  35     const Extension* extension) {
  36   RequirementsInfo* info = static_cast<RequirementsInfo*>(
  37       extension->GetManifestData(keys::kRequirements));
  38
  39   // We should be guaranteed to have requirements, since they are parsed for all
  40   // extension types.
  41   CHECK(info);
  42   return *info;
  43 }
  44
  45 RequirementsHandler::RequirementsHandler() {
  46 }
  47
  48 RequirementsHandler::~RequirementsHandler() {
  49 }
  50
  51 const std::vector<std::string> RequirementsHandler::PrerequisiteKeys() const {
  52   return SingleKey(keys::kPlugins);
  53 }
  54
  55 const std::vector<std::string> RequirementsHandler::Keys() const {
  56   return SingleKey(keys::kRequirements);
  57 }
  58
  59 bool RequirementsHandler::AlwaysParseForType(Manifest::Type type) const {
  60   return true;
  61 }
  62
  63 bool RequirementsHandler::Parse(Extension* extension, base::string16* error) {
  64   scoped_ptr<RequirementsInfo> requirements(
  65       new RequirementsInfo(extension->manifest()));
  66
  67   if (!extension->manifest()->HasKey(keys::kRequirements)) {
  68     extension->SetManifestData(keys::kRequirements, requirements.release());
  69     return true;
  70   }
  71
  72   const base::DictionaryValue* requirements_value = NULL;
  73   if (!extension->manifest()->GetDictionary(keys::kRequirements,
  74                                             &requirements_value)) {
  75     *error = base::ASCIIToUTF16(errors::kInvalidRequirements);
  76     return false;
  77   }
  78
  79   for (base::DictionaryValue::Iterator iter(*requirements_value);
  80        !iter.IsAtEnd();
  81        iter.Advance()) {
  82     const base::DictionaryValue* requirement_value;
  83     if (!iter.value().GetAsDictionary(&requirement_value)) {
  84       *error = ErrorUtils::FormatErrorMessageUTF16(
  85           errors::kInvalidRequirement, iter.key());
  86       return false;
  87     }
  88
  89     if (iter.key() == "plugins") {
  90       for (base::DictionaryValue::Iterator plugin_iter(*requirement_value);
  91            !plugin_iter.IsAtEnd(); plugin_iter.Advance()) {
  92         bool plugin_required = false;
  93         if (!plugin_iter.value().GetAsBoolean(&plugin_required)) {
  94           *error = ErrorUtils::FormatErrorMessageUTF16(
  95               errors::kInvalidRequirement, iter.key());
  96           return false;
  97         }
  98         if (plugin_iter.key() == "npapi") {
  99           requirements->npapi = plugin_required;
 100         } else {
 101           *error = ErrorUtils::FormatErrorMessageUTF16(
 102               errors::kInvalidRequirement, iter.key());
 103           return false;
 104         }
 105       }
 106     } else if (iter.key() == "3D") {
 107       const base::ListValue* features = NULL;
 108       if (!requirement_value->GetListWithoutPathExpansion("features",
 109                                                           &features) ||
 110           !features) {
 111         *error = ErrorUtils::FormatErrorMessageUTF16(
 112             errors::kInvalidRequirement, iter.key());
 113         return false;
 114       }
 115
 116       for (base::ListValue::const_iterator feature_iter = features->begin();
 117            feature_iter != features->end(); ++feature_iter) {
 118         std::string feature;
 119         if ((*feature_iter)->GetAsString(&feature)) {
 120           if (feature == "webgl") {
 121             requirements->webgl = true;
 122           } else if (feature == "css3d") {
 123             // css3d is always available, so no check is needed, but no error is
 124             // generated.
 125           } else {
 126             *error = ErrorUtils::FormatErrorMessageUTF16(
 127                 errors::kInvalidRequirement, iter.key());
 128             return false;
 129           }
 130         }
 131       }
 132     } else if (iter.key() == "window") {
 133       for (base::DictionaryValue::Iterator feature_iter(*requirement_value);
 134            !feature_iter.IsAtEnd(); feature_iter.Advance()) {
 135         bool feature_required = false;
 136         if (!feature_iter.value().GetAsBoolean(&feature_required)) {
 137           *error = ErrorUtils::FormatErrorMessageUTF16(
 138               errors::kInvalidRequirement, iter.key());
 139           return false;
 140         }
 141         if (feature_iter.key() == "shape") {
 142           requirements->window_shape = feature_required;
 143         } else {
 144           *error = ErrorUtils::FormatErrorMessageUTF16(
 145               errors::kInvalidRequirement, iter.key());
 146           return false;
 147         }
 148       }
 149     } else {
 150       *error = base::ASCIIToUTF16(errors::kInvalidRequirements);
 151       return false;
 152     }
 153   }
 154
 155   extension->SetManifestData(keys::kRequirements, requirements.release());
 156   return true;
 157 }
 158
 159 }  // namespace extensions