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// Copyright 2014 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 "content/browser/service_worker/service_worker_utils.h"
#include <string>
#include "base/logging.h"
#include "base/strings/string_util.h"
namespace content {
namespace {
const char kDisallowedCharacterErrorMessage[] =
"The scope/script URL includes disallowed escaped character.";
const char kPathRestrictionErrorMessage[] =
"The scope must be under the directory of the script URL.";
bool ContainsDisallowedCharacter(const GURL& url) {
std::string path = url.path();
DCHECK(base::IsStringUTF8(path));
// We should avoid these escaped characters in the path component because
// these can be handled differently depending on server implementation.
if (path.find("%2f") != std::string::npos ||
path.find("%2F") != std::string::npos) {
return true;
}
if (path.find("%5c") != std::string::npos ||
path.find("%5C") != std::string::npos) {
return true;
}
return false;
}
std::string GetDirectoryPath(const GURL& url) {
std::string path = url.path();
std::string directory_path =
path.substr(0, path.size() - url.ExtractFileName().size());
DCHECK(EndsWith(directory_path, "/", true));
return directory_path;
}
} // namespace
// static
bool ServiceWorkerUtils::ScopeMatches(const GURL& scope, const GURL& url) {
DCHECK(!scope.has_ref());
DCHECK(!url.has_ref());
return StartsWithASCII(url.spec(), scope.spec(), true);
}
// static
bool ServiceWorkerUtils::IsPathRestrictionSatisfied(
const GURL& scope,
const GURL& script_url,
std::string* error_message) {
DCHECK(scope.is_valid());
DCHECK(!scope.has_ref());
DCHECK(script_url.is_valid());
DCHECK(!script_url.has_ref());
DCHECK(error_message);
if (ContainsDisallowedCharacter(scope) ||
ContainsDisallowedCharacter(script_url)) {
*error_message = kDisallowedCharacterErrorMessage;
return false;
}
// |scope|'s path should be under the |script_url|'s directory.
if (!StartsWithASCII(scope.path(), GetDirectoryPath(script_url), true)) {
*error_message = kPathRestrictionErrorMessage;
return false;
}
return true;
}
bool LongestScopeMatcher::MatchLongest(const GURL& scope) {
if (!ServiceWorkerUtils::ScopeMatches(scope, url_))
return false;
if (match_.is_empty() || match_.spec().size() < scope.spec().size()) {
match_ = scope;
return true;
}
return false;
}
} // namespace content
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