Basic multi-module support

chrome/common/extensions/manifest_handlers/shared_module_info.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/shared_module_info.h"
+
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/utf_string_conversions.h"
+#include "base/version.h"
+#include "chrome/common/extensions/extension_constants.h"
+#include "chrome/common/extensions/extension_manifest_constants.h"
+#include "chrome/common/extensions/permissions/permission_set.h"
+#include "extensions/common/error_utils.h"
+
+using base::DictionaryValue;
+namespace keys = extension_manifest_keys;
+namespace values = extension_manifest_values;
+namespace errors = extension_manifest_errors;
+
+namespace extensions {
+
+namespace {
+
+const char kSharedModule[] = "shared_module";
+
+static base::LazyInstance<SharedModuleInfo> g_empty_shared_module_info =
+    LAZY_INSTANCE_INITIALIZER;
+
+const SharedModuleInfo& GetSharedModuleInfo(const Extension* extension) {
+  SharedModuleInfo* info = static_cast<SharedModuleInfo*>(
+      extension->GetManifestData(kSharedModule));
+  if (!info)
+    return g_empty_shared_module_info.Get();
+  return *info;
+}
+
+}  // namespace
+
+SharedModuleInfo::SharedModuleInfo() {
+}
+
+SharedModuleInfo::~SharedModuleInfo() {
+}
+
+// static
+void SharedModuleInfo::ParseImportedPath(const std::string& path,
+                                         std::string* import_id,
+                                         std::string* import_relative_path) {
+  std::vector<std::string> tokens;
+  Tokenize(path, std::string("/"), &tokens);
+  if (tokens.size() > 2 && tokens[0] == extension_filenames::kModulesDir &&
+      Extension::IdIsValid(tokens[1])) {
+    *import_id = tokens[1];
+    *import_relative_path = tokens[2];
+    for (size_t i = 3; i < tokens.size(); ++i)
+      *import_relative_path += "/" + tokens[i];
+  }
+}
+
+// static
+bool SharedModuleInfo::IsImportedPath(const std::string& path) {
+  std::vector<std::string> tokens;
+  Tokenize(path, std::string("/"), &tokens);
+  if (tokens.size() > 2 && tokens[0] == extension_filenames::kModulesDir &&
+      Extension::IdIsValid(tokens[1])) {
+    return true;
+  }
+  return false;
+}
+
+// static
+bool SharedModuleInfo::IsSharedModule(const Extension* extension) {
+  CHECK(extension);
+  return extension->manifest()->is_shared_module();
+}
+
+// static
+bool SharedModuleInfo::IsExportAllowed(const Extension* extension,
+                                       const std::string& relative_path) {
+  return GetSharedModuleInfo(extension).
+      exported_set_.MatchesURL(extension->url().Resolve(relative_path));
+}
+
+// static
+bool SharedModuleInfo::ImportsExtensionById(const Extension* extension,
+                                            const std::string& other_id) {
+  const SharedModuleInfo& info = GetSharedModuleInfo(extension);
+  for (size_t i = 0; i < info.imports_.size(); i++) {
+    if (info.imports_[i].extension_id == other_id)
+      return true;
+  }
+  return false;
+}
+
+// static
+bool SharedModuleInfo::ImportsModules(const Extension* extension) {
+  return GetSharedModuleInfo(extension).imports_.size() > 0;
+}
+
+// static
+const std::vector<SharedModuleInfo::ImportInfo>& SharedModuleInfo::GetImports(
+    const Extension* extension) {
+  return GetSharedModuleInfo(extension).imports_;
+}
+
+bool SharedModuleInfo::Parse(const Extension* extension, string16* error) {
+  bool has_import = extension->manifest()->HasKey(keys::kImport);
+  bool has_export = extension->manifest()->HasKey(keys::kExport);
+  if (!has_import && !has_export)
+    return true;
+
+  if (has_import && has_export) {
+    *error = ASCIIToUTF16(errors::kInvalidImportAndExport);
+    return false;
+  }
+
+  if (has_export) {
+    const DictionaryValue* export_value = NULL;
+    if (!extension->manifest()->GetDictionary(keys::kExport, &export_value)) {
+      *error = ASCIIToUTF16(errors::kInvalidExport);
+      return false;
+    }
+    const ListValue* resources_list = NULL;
+    if (!export_value->GetList(keys::kResources, &resources_list)) {
+      *error = ASCIIToUTF16(errors::kInvalidExportResources);
+      return false;
+    }
+    for (size_t i = 0; i < resources_list->GetSize(); ++i) {
+      std::string resource_path;
+      if (!resources_list->GetString(i, &resource_path)) {
+        *error = ErrorUtils::FormatErrorMessageUTF16(
+            errors::kInvalidExportResourcesString, base::IntToString(i));
+        return false;
+      }
+      const GURL& resolved_path = extension->url().Resolve(resource_path);
+      if (!resolved_path.is_valid()) {
+        *error = ErrorUtils::FormatErrorMessageUTF16(
+            errors::kInvalidExportResourcesString, base::IntToString(i));
+        return false;
+      }
+      exported_set_.AddPattern(
+          URLPattern(URLPattern::SCHEME_EXTENSION, resolved_path.spec()));
+    }
+  }
+
+  if (has_import) {
+    const ListValue* import_list = NULL;
+    if (!extension->manifest()->GetList(keys::kImport, &import_list)) {
+      *error = ASCIIToUTF16(errors::kInvalidImport);
+      return false;
+    }
+    for (size_t i = 0; i < import_list->GetSize(); ++i) {
+      const DictionaryValue* import_entry = NULL;
+      if (!import_list->GetDictionary(i, &import_entry)) {
+        *error = ASCIIToUTF16(errors::kInvalidImport);
+        return false;
+      }
+      std::string extension_id;
+      imports_.push_back(ImportInfo());
+      if (!import_entry->GetString(keys::kId, &extension_id) ||
+          !Extension::IdIsValid(extension_id)) {
+        *error = ErrorUtils::FormatErrorMessageUTF16(
+            errors::kInvalidImportId, base::IntToString(i));
+        return false;
+      }
+      imports_.back().extension_id = extension_id;
+      if (import_entry->HasKey(keys::kMinimumVersion)) {
+        std::string min_version;
+        if (!import_entry->GetString(keys::kMinimumVersion, &min_version)) {
+          *error = ErrorUtils::FormatErrorMessageUTF16(
+              errors::kInvalidImportVersion, base::IntToString(i));
+          return false;
+        }
+        imports_.back().minimum_version = min_version;
+        Version v(min_version);
+        if (!v.IsValid()) {
+          *error = ErrorUtils::FormatErrorMessageUTF16(
+              errors::kInvalidImportVersion, base::IntToString(i));
+          return false;
+        }
+      }
+    }
+  }
+  return true;
+}
+
+
+SharedModuleHandler::SharedModuleHandler() {
+}
+
+SharedModuleHandler::~SharedModuleHandler() {
+}
+
+bool SharedModuleHandler::Parse(Extension* extension, string16* error) {
+  scoped_ptr<SharedModuleInfo> info(new SharedModuleInfo);
+  if (!info->Parse(extension, error))
+    return false;
+  extension->SetManifestData(kSharedModule, info.release());
+  return true;
+}
+
+bool SharedModuleHandler::Validate(
+    const Extension* extension,
+    std::string* error,
+    std::vector<InstallWarning>* warnings) const {
+  // Extensions that export resources should not have any permissions of their
+  // own, instead they rely on the permissions of the extensions which import
+  // them.
+  if (SharedModuleInfo::IsSharedModule(extension) &&
+      !extension->GetActivePermissions()->IsEmpty()) {
+    *error = errors::kInvalidExportPermissions;
+    return false;
+  }
+  return true;
+}
+
+const std::vector<std::string> SharedModuleHandler::Keys() const {
+  static const char* keys[] = {
+    keys::kExport,
+    keys::kImport
+  };
+  return std::vector<std::string>(keys, keys + arraysize(keys));
+}
+
+}  // extensions
+