Move Requirements out of Extension Class

chrome/common/extensions/manifest_handlers/requirements_handler.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/common/extensions/manifest_handlers/requirements_handler.h"
+
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/common/extensions/extension_manifest_constants.h"
+#include "extensions/common/error_utils.h"
+
+namespace keys = extension_manifest_keys;
+namespace errors = extension_manifest_errors;
+
+namespace extensions {
+
+RequirementsInfo::RequirementsInfo(const Manifest* manifest)
+    : webgl(false),
+      css3d(false),
+      npapi(false) {
+  // Before parsing requirements from the manifest, automatically default the
+  // NPAPI plugin requirement based on whether it includes NPAPI plugins.
+  const ListValue* list_value = NULL;
+  npapi = manifest->GetList(keys::kPlugins, &list_value) &&
+          !list_value->empty();
+}
+
+RequirementsInfo::~RequirementsInfo() {
+}
+
+// static
+const RequirementsInfo& RequirementsInfo::GetRequirements(
+    const Extension* extension) {
+  RequirementsInfo* info = static_cast<RequirementsInfo*>(
+      extension->GetManifestData(keys::kRequirements));
+
+  // We should be guaranteed to have requirements, since they are parsed for all
+  // extension types.
+  CHECK(info);
+  return *info;
+}
+
+RequirementsHandler::RequirementsHandler() {
+}
+
+RequirementsHandler::~RequirementsHandler() {
+}
+
+const std::vector<std::string> RequirementsHandler::PrerequisiteKeys() const {
+  return SingleKey(keys::kPlugins);
+}
+
+const std::vector<std::string> RequirementsHandler::Keys() const {
+  return SingleKey(keys::kRequirements);
+}
+
+bool RequirementsHandler::AlwaysParseForType(Manifest::Type type) const {
+  return true;
+}
+
+bool RequirementsHandler::Parse(Extension* extension, string16* error) {
+  scoped_ptr<RequirementsInfo> requirements(
+      new RequirementsInfo(extension->manifest()));
+
+  if (!extension->manifest()->HasKey(keys::kRequirements)) {
+    extension->SetManifestData(keys::kRequirements, requirements.release());
+    return true;
+  }
+
+  const DictionaryValue* requirements_value = NULL;
+  if (!extension->manifest()->GetDictionary(keys::kRequirements,
+                                            &requirements_value)) {
+    *error = ASCIIToUTF16(errors::kInvalidRequirements);
+    return false;
+  }
+
+  for (DictionaryValue::Iterator iter(*requirements_value); !iter.IsAtEnd();
+       iter.Advance()) {
+    const DictionaryValue* requirement_value;
+    if (!iter.value().GetAsDictionary(&requirement_value)) {
+      *error = ErrorUtils::FormatErrorMessageUTF16(
+          errors::kInvalidRequirement, iter.key());
+      return false;
+    }
+
+    if (iter.key() == "plugins") {
+      for (DictionaryValue::Iterator plugin_iter(*requirement_value);
+           !plugin_iter.IsAtEnd(); plugin_iter.Advance()) {
+        bool plugin_required = false;
+        if (!plugin_iter.value().GetAsBoolean(&plugin_required)) {
+          *error = ErrorUtils::FormatErrorMessageUTF16(
+              errors::kInvalidRequirement, iter.key());
+          return false;
+        }
+        if (plugin_iter.key() == "npapi") {
+          requirements->npapi = plugin_required;
+        } else {
+          *error = ErrorUtils::FormatErrorMessageUTF16(
+              errors::kInvalidRequirement, iter.key());
+          return false;
+        }
+      }
+    } else if (iter.key() == "3D") {
+      const ListValue* features = NULL;
+      if (!requirement_value->GetListWithoutPathExpansion("features",
+                                                          &features) ||
+          !features) {
+        *error = ErrorUtils::FormatErrorMessageUTF16(
+            errors::kInvalidRequirement, iter.key());
+        return false;
+      }
+
+      for (base::ListValue::const_iterator feature_iter = features->begin();
+           feature_iter != features->end(); ++feature_iter) {
+        std::string feature;
+        if ((*feature_iter)->GetAsString(&feature)) {
+          if (feature == "webgl") {
+            requirements->webgl = true;
+          } else if (feature == "css3d") {
+            requirements->css3d = true;
+          } else {
+            *error = ErrorUtils::FormatErrorMessageUTF16(
+                errors::kInvalidRequirement, iter.key());
+            return false;
+          }
+        }
+      }
+    } else {
+      *error = ASCIIToUTF16(errors::kInvalidRequirements);
+      return false;
+    }
+  }
+
+  extension->SetManifestData(keys::kRequirements, requirements.release());
+  return true;
+}
+
+}  // namespace extensions