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// 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/browser/extensions/api/permissions/permissions_api_helpers.h"
#include <stddef.h>
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/memory/ptr_util.h"
#include "base/values.h"
#include "chrome/common/extensions/api/permissions.h"
#include "extensions/common/error_utils.h"
#include "extensions/common/extension.h"
#include "extensions/common/permissions/permission_set.h"
#include "extensions/common/permissions/permissions_info.h"
#include "extensions/common/permissions/usb_device_permission.h"
#include "extensions/common/url_pattern_set.h"
namespace extensions {
using api::permissions::Permissions;
namespace permissions_api_helpers {
namespace {
const char kDelimiter[] = "|";
const char kInvalidParameter[] =
"Invalid argument for permission '*'.";
const char kInvalidOrigin[] =
"Invalid value for origin pattern *: *";
const char kUnknownPermissionError[] =
"'*' is not a recognized permission.";
const char kUnsupportedPermissionId[] =
"Only the usbDevices permission supports arguments.";
} // namespace
std::unique_ptr<Permissions> PackPermissionSet(const PermissionSet& set) {
std::unique_ptr<Permissions> permissions(new Permissions());
permissions->permissions.reset(new std::vector<std::string>());
for (const APIPermission* api : set.apis()) {
std::unique_ptr<base::Value> value(api->ToValue());
if (!value) {
permissions->permissions->push_back(api->name());
} else {
std::string name(api->name());
std::string json;
base::JSONWriter::Write(*value, &json);
permissions->permissions->push_back(name + kDelimiter + json);
}
}
// TODO(rpaquay): We currently don't expose manifest permissions
// to apps/extensions via the permissions API.
permissions->origins.reset(new std::vector<std::string>());
for (const URLPattern& pattern : set.explicit_hosts())
permissions->origins->push_back(pattern.GetAsString());
return permissions;
}
std::unique_ptr<const PermissionSet> UnpackPermissionSet(
const Permissions& permissions,
bool allow_file_access,
std::string* error) {
DCHECK(error);
APIPermissionSet apis;
std::vector<std::string>* permissions_list = permissions.permissions.get();
if (permissions_list) {
PermissionsInfo* info = PermissionsInfo::GetInstance();
for (std::vector<std::string>::iterator it = permissions_list->begin();
it != permissions_list->end(); ++it) {
// This is a compromise: we currently can't switch to a blend of
// objects/strings all the way through the API. Until then, put this
// processing here.
// http://code.google.com/p/chromium/issues/detail?id=162042
if (it->find(kDelimiter) != std::string::npos) {
size_t delimiter = it->find(kDelimiter);
std::string permission_name = it->substr(0, delimiter);
std::string permission_arg = it->substr(delimiter + 1);
std::unique_ptr<base::Value> permission_json =
base::JSONReader::Read(permission_arg);
if (!permission_json.get()) {
*error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
return NULL;
}
APIPermission* permission = NULL;
// Explicitly check the permissions that accept arguments until the bug
// referenced above is fixed.
const APIPermissionInfo* usb_device_permission_info =
info->GetByID(APIPermission::kUsbDevice);
if (permission_name == usb_device_permission_info->name()) {
permission = new UsbDevicePermission(usb_device_permission_info);
} else {
*error = kUnsupportedPermissionId;
return NULL;
}
CHECK(permission);
if (!permission->FromValue(permission_json.get(), NULL, NULL)) {
*error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
return NULL;
}
apis.insert(permission);
} else {
const APIPermissionInfo* permission_info = info->GetByName(*it);
if (!permission_info) {
*error = ErrorUtils::FormatErrorMessage(
kUnknownPermissionError, *it);
return NULL;
}
apis.insert(permission_info->id());
}
}
}
// TODO(rpaquay): We currently don't expose manifest permissions
// to apps/extensions via the permissions API.
ManifestPermissionSet manifest_permissions;
URLPatternSet origins;
if (permissions.origins.get()) {
for (std::vector<std::string>::iterator it = permissions.origins->begin();
it != permissions.origins->end(); ++it) {
int allowed_schemes = Extension::kValidHostPermissionSchemes;
if (!allow_file_access)
allowed_schemes &= ~URLPattern::SCHEME_FILE;
URLPattern origin(allowed_schemes);
URLPattern::ParseResult parse_result = origin.Parse(*it);
if (URLPattern::PARSE_SUCCESS != parse_result) {
*error = ErrorUtils::FormatErrorMessage(
kInvalidOrigin,
*it,
URLPattern::GetParseResultString(parse_result));
return NULL;
}
origins.AddPattern(origin);
}
}
return base::MakeUnique<PermissionSet>(apis, manifest_permissions, origins,
URLPatternSet());
}
} // namespace permissions_api_helpers
} // namespace extensions
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