Implement ComplexFeature to support permission features with multiple rules.

chrome/common/extensions/features/feature.cc

 // Copyright (c) 2012 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/features/feature.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "chrome/common/chrome_switches.h"
 
 using chrome::VersionInfo;
 using extensions::Extension;
 
 namespace {
 
-struct Mappings {
-  Mappings() {
-    extension_types["extension"] = Extension::TYPE_EXTENSION;
-    extension_types["theme"] = Extension::TYPE_THEME;
-    extension_types["packaged_app"]
-        = Extension::TYPE_LEGACY_PACKAGED_APP;
-    extension_types["hosted_app"] = Extension::TYPE_HOSTED_APP;
-    extension_types["platform_app"] = Extension::TYPE_PLATFORM_APP;
-
-    contexts["blessed_extension"] =
-        extensions::Feature::BLESSED_EXTENSION_CONTEXT;
-    contexts["unblessed_extension"] =
-        extensions::Feature::UNBLESSED_EXTENSION_CONTEXT;
-    contexts["content_script"] = extensions::Feature::CONTENT_SCRIPT_CONTEXT;
-    contexts["web_page"] = extensions::Feature::WEB_PAGE_CONTEXT;
-
-    locations["component"] = extensions::Feature::COMPONENT_LOCATION;
-
-    platforms["chromeos"] = extensions::Feature::CHROMEOS_PLATFORM;
-
-    channels["trunk"] = VersionInfo::CHANNEL_UNKNOWN;
-    channels["canary"] = VersionInfo::CHANNEL_CANARY;
-    channels["dev"] = VersionInfo::CHANNEL_DEV;
-    channels["beta"] = VersionInfo::CHANNEL_BETA;
-    channels["stable"] = VersionInfo::CHANNEL_STABLE;
-  }
-
-  std::map<std::string, Extension::Type> extension_types;
-  std::map<std::string, extensions::Feature::Context> contexts;
-  std::map<std::string, extensions::Feature::Location> locations;
-  std::map<std::string, extensions::Feature::Platform> platforms;
-  std::map<std::string, VersionInfo::Channel> channels;
-};
-
-base::LazyInstance<Mappings> g_mappings = LAZY_INSTANCE_INITIALIZER;
-
-std::string GetChannelName(VersionInfo::Channel channel) {
-  typedef std::map<std::string, VersionInfo::Channel> ChannelsMap;
-  ChannelsMap channels = g_mappings.Get().channels;
-  for (ChannelsMap::iterator i = channels.begin(); i != channels.end(); ++i) {
-    if (i->second == channel)
-      return i->first;
-  }
-  NOTREACHED();
-  return "unknown";
-}
-
 const VersionInfo::Channel kDefaultChannel = VersionInfo::CHANNEL_STABLE;
 VersionInfo::Channel g_current_channel = kDefaultChannel;
 
-// TODO(aa): Can we replace all this manual parsing with JSON schema stuff?
-
-void ParseSet(const DictionaryValue* value,
-              const std::string& property,
-              std::set<std::string>* set) {
-  const ListValue* list_value = NULL;
-  if (!value->GetList(property, &list_value))
-    return;
-
-  set->clear();
-  for (size_t i = 0; i < list_value->GetSize(); ++i) {
-    std::string str_val;
-    CHECK(list_value->GetString(i, &str_val)) << property << " " << i;
-    set->insert(str_val);
-  }
-}
-
-template<typename T>
-void ParseEnum(const std::string& string_value,
-               T* enum_value,
-               const std::map<std::string, T>& mapping) {
-  typename std::map<std::string, T>::const_iterator iter =
-      mapping.find(string_value);
-  CHECK(iter != mapping.end()) << string_value;
-  *enum_value = iter->second;
-}
-
-template<typename T>
-void ParseEnum(const DictionaryValue* value,
-               const std::string& property,
-               T* enum_value,
-               const std::map<std::string, T>& mapping) {
-  std::string string_value;
-  if (!value->GetString(property, &string_value))
-    return;
-
-  ParseEnum(string_value, enum_value, mapping);
-}
-
-template<typename T>
-void ParseEnumSet(const DictionaryValue* value,
-                  const std::string& property,
-                  std::set<T>* enum_set,
-                  const std::map<std::string, T>& mapping) {
-  if (!value->HasKey(property))
-    return;
-
-  enum_set->clear();
-
-  std::string property_string;
-  if (value->GetString(property, &property_string)) {
-    if (property_string == "all") {
-      for (typename std::map<std::string, T>::const_iterator j =
-               mapping.begin(); j != mapping.end(); ++j) {
-        enum_set->insert(j->second);
-      }
-    }
-    return;
-  }
-
-  std::set<std::string> string_set;
-  ParseSet(value, property, &string_set);
-  for (std::set<std::string>::iterator iter = string_set.begin();
-       iter != string_set.end(); ++iter) {
-    T enum_value = static_cast<T>(0);
-    ParseEnum(*iter, &enum_value, mapping);
-    enum_set->insert(enum_value);
-  }
-}
-
-// Gets a human-readable name for the given extension type.
-std::string GetDisplayTypeName(Extension::Type type) {
-  switch (type) {
-    case Extension::TYPE_UNKNOWN:
-      return "unknown";
-    case Extension::TYPE_EXTENSION:
-      return "extension";
-    case Extension::TYPE_HOSTED_APP:
-      return "hosted app";
-    case Extension::TYPE_LEGACY_PACKAGED_APP:
-      return "legacy packaged app";
-    case Extension::TYPE_PLATFORM_APP:
-      return "packaged app";
-    case Extension::TYPE_THEME:
-      return "theme";
-    case Extension::TYPE_USER_SCRIPT:
-      return "user script";
-  }
-
-  NOTREACHED();
-  return "";
-}
-
 }  // namespace
 
 namespace extensions {
 
-Feature::Feature()
-  : location_(UNSPECIFIED_LOCATION),
-    platform_(UNSPECIFIED_PLATFORM),
-    min_manifest_version_(0),
-    max_manifest_version_(0),
-    channel_(VersionInfo::CHANNEL_UNKNOWN) {
-}
-
-Feature::Feature(const Feature& other)
-    : whitelist_(other.whitelist_),
-      extension_types_(other.extension_types_),
-      contexts_(other.contexts_),
-      location_(other.location_),
-      platform_(other.platform_),
-      min_manifest_version_(other.min_manifest_version_),
-      max_manifest_version_(other.max_manifest_version_),
-      channel_(other.channel_) {
-}
-
-Feature::~Feature() {
-}
-
-bool Feature::Equals(const Feature& other) const {
-  return whitelist_ == other.whitelist_ &&
-      extension_types_ == other.extension_types_ &&
-      contexts_ == other.contexts_ &&
-      location_ == other.location_ &&
-      platform_ == other.platform_ &&
-      min_manifest_version_ == other.min_manifest_version_ &&
-      max_manifest_version_ == other.max_manifest_version_ &&
-      channel_ == other.channel_;
-}
-
 // static
 Feature::Platform Feature::GetCurrentPlatform() {
 #if defined(OS_CHROMEOS)
   return CHROMEOS_PLATFORM;
 #else
   return UNSPECIFIED_PLATFORM;
 #endif
 }
 
 // static
 Feature::Location Feature::ConvertLocation(Extension::Location location) {
   if (location == Extension::COMPONENT)
     return COMPONENT_LOCATION;
   else
     return UNSPECIFIED_LOCATION;
 }
 
-void Feature::Parse(const DictionaryValue* value) {
-  ParseSet(value, "whitelist", &whitelist_);
-  ParseEnumSet<Extension::Type>(value, "extension_types", &extension_types_,
-                                g_mappings.Get().extension_types);
-  ParseEnumSet<Context>(value, "contexts", &contexts_,
-                        g_mappings.Get().contexts);
-  ParseEnum<Location>(value, "location", &location_,
-                      g_mappings.Get().locations);
-  ParseEnum<Platform>(value, "platform", &platform_,
-                      g_mappings.Get().platforms);
-  value->GetInteger("min_manifest_version", &min_manifest_version_);
-  value->GetInteger("max_manifest_version", &max_manifest_version_);
-  ParseEnum<VersionInfo::Channel>(
-      value, "channel", &channel_,
-      g_mappings.Get().channels);
-}
-
-Feature::Availability Feature::IsAvailableToManifest(
-    const std::string& extension_id,
-    Extension::Type type,
-    Location location,
-    int manifest_version,
-    Platform platform) const {
-  // Component extensions can access any feature.
-  if (location == COMPONENT_LOCATION)
-    return CreateAvailability(IS_AVAILABLE, type);
-
-  if (!whitelist_.empty()) {
-    if (whitelist_.find(extension_id) == whitelist_.end()) {
-      // TODO(aa): This is gross. There should be a better way to test the
-      // whitelist.
-      CommandLine* command_line = CommandLine::ForCurrentProcess();
-      if (!command_line->HasSwitch(switches::kWhitelistedExtensionID))
-        return CreateAvailability(NOT_FOUND_IN_WHITELIST, type);
-
-      std::string whitelist_switch_value =
-          CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-              switches::kWhitelistedExtensionID);
-      if (extension_id != whitelist_switch_value)
-        return CreateAvailability(NOT_FOUND_IN_WHITELIST, type);
-    }
-  }
-
-  if (!extension_types_.empty() &&
-      extension_types_.find(type) == extension_types_.end()) {
-    return CreateAvailability(INVALID_TYPE, type);
-  }
-
-  if (location_ != UNSPECIFIED_LOCATION && location_ != location)
-    return CreateAvailability(INVALID_LOCATION, type);
-
-  if (platform_ != UNSPECIFIED_PLATFORM && platform_ != platform)
-    return CreateAvailability(INVALID_PLATFORM, type);
-
-  if (min_manifest_version_ != 0 && manifest_version < min_manifest_version_)
-    return CreateAvailability(INVALID_MIN_MANIFEST_VERSION, type);
-
-  if (max_manifest_version_ != 0 && manifest_version > max_manifest_version_)
-    return CreateAvailability(INVALID_MAX_MANIFEST_VERSION, type);
-
-  if (channel_ < g_current_channel)
-    return CreateAvailability(UNSUPPORTED_CHANNEL, type);
-
-  return CreateAvailability(IS_AVAILABLE, type);
-}
-
-Feature::Availability Feature::IsAvailableToContext(
-    const Extension* extension,
-    Feature::Context context,
-    Feature::Platform platform) const {
-  Availability result = IsAvailableToManifest(
-      extension->id(),
-      extension->GetType(),
-      ConvertLocation(extension->location()),
-      extension->manifest_version(),
-      platform);
-  if (!result.is_available())
-    return result;
-
-  if (!contexts_.empty() &&
-      contexts_.find(context) == contexts_.end()) {
-    return CreateAvailability(INVALID_CONTEXT, extension->GetType());
-  }
-
-  return CreateAvailability(IS_AVAILABLE);
-}
-
 // static
 chrome::VersionInfo::Channel Feature::GetCurrentChannel() {
   return g_current_channel;
 }
 
 // static
 void Feature::SetCurrentChannel(VersionInfo::Channel channel) {
   g_current_channel = channel;
 }
 
 // static
 chrome::VersionInfo::Channel Feature::GetDefaultChannel() {
   return kDefaultChannel;
 }
 
-Feature::Availability Feature::CreateAvailability(
-    AvailabilityResult result) const {
-  return Availability(
-      result, GetAvailabilityMessage(result, Extension::TYPE_UNKNOWN));
-}
-
-Feature::Availability Feature::CreateAvailability(
-    AvailabilityResult result, Extension::Type type) const {
-  return Availability(result, GetAvailabilityMessage(result, type));
-}
-
-std::string Feature::GetAvailabilityMessage(
-    AvailabilityResult result, Extension::Type type) const {
-  switch (result) {
-    case IS_AVAILABLE:
-      return "";
-    case NOT_FOUND_IN_WHITELIST:
-      return base::StringPrintf(
-          "'%s' is not allowed for specified extension ID.",
-          name().c_str());
-    case INVALID_TYPE: {
-      std::string allowed_type_names;
-      // Turn the set of allowed types into a vector so that it's easier to
-      // inject the appropriate separator into the display string.
-      std::vector<Extension::Type> extension_types(
-          extension_types_.begin(), extension_types_.end());
-      for (size_t i = 0; i < extension_types.size(); i++) {
-        // Pluralize type name.
-        allowed_type_names += GetDisplayTypeName(extension_types[i]) + "s";
-        if (i == extension_types_.size() - 2) {
-          allowed_type_names += " and ";
-        } else if (i != extension_types_.size() - 1) {
-          allowed_type_names += ", ";
-        }
-      }
-
-      return base::StringPrintf(
-          "'%s' is only allowed for %s, and this is a %s.",
-          name().c_str(),
-          allowed_type_names.c_str(),
-          GetDisplayTypeName(type).c_str());
-    }
-    case INVALID_CONTEXT:
-      return base::StringPrintf(
-          "'%s' is not allowed for specified context type content script, "
-          " extension page, web page, etc.).",
-          name().c_str());
-    case INVALID_LOCATION:
-      return base::StringPrintf(
-          "'%s' is not allowed for specified install location.",
-          name().c_str());
-    case INVALID_PLATFORM:
-      return base::StringPrintf(
-          "'%s' is not allowed for specified platform.",
-          name().c_str());
-    case INVALID_MIN_MANIFEST_VERSION:
-      return base::StringPrintf(
-          "'%s' requires manifest version of at least %d.",
-          name().c_str(),
-          min_manifest_version_);
-    case INVALID_MAX_MANIFEST_VERSION:
-      return base::StringPrintf(
-          "'%s' requires manifest version of %d or lower.",
-          name().c_str(),
-          max_manifest_version_);
-    case NOT_PRESENT:
-      return base::StringPrintf(
-          "'%s' requires a different Feature that is not present.",
-          name().c_str());
-    case UNSUPPORTED_CHANNEL:
-      return base::StringPrintf(
-          "'%s' requires Google Chrome %s channel or newer, and this is the "
-              "%s channel.",
-          name().c_str(),
-          GetChannelName(channel_).c_str(),
-          GetChannelName(GetCurrentChannel()).c_str());
-  }
-
-  NOTREACHED();
-  return "";
-}
-
+Feature::~Feature() {}
 
 }  // namespace extensions