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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 "extensions/common/extension_resource.h"
#include <stddef.h>
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/threading/thread_restrictions.h"
namespace extensions {
ExtensionResource::ExtensionResource() : follow_symlinks_anywhere_(false) {
}
ExtensionResource::ExtensionResource(const std::string& extension_id,
const base::FilePath& extension_root,
const base::FilePath& relative_path)
: extension_id_(extension_id),
extension_root_(extension_root),
relative_path_(relative_path),
follow_symlinks_anywhere_(false) {
}
ExtensionResource::ExtensionResource(const ExtensionResource& other) = default;
ExtensionResource::~ExtensionResource() {}
void ExtensionResource::set_follow_symlinks_anywhere() {
follow_symlinks_anywhere_ = true;
}
const base::FilePath& ExtensionResource::GetFilePath() const {
if (extension_root_.empty() || relative_path_.empty()) {
DCHECK(full_resource_path_.empty());
return full_resource_path_;
}
// We've already checked, just return last value.
if (!full_resource_path_.empty())
return full_resource_path_;
full_resource_path_ = GetFilePath(
extension_root_, relative_path_,
follow_symlinks_anywhere_ ?
FOLLOW_SYMLINKS_ANYWHERE : SYMLINKS_MUST_RESOLVE_WITHIN_ROOT);
return full_resource_path_;
}
// static
base::FilePath ExtensionResource::GetFilePath(
const base::FilePath& extension_root,
const base::FilePath& relative_path,
SymlinkPolicy symlink_policy) {
// We need to resolve the parent references in the extension_root
// path on its own because IsParent doesn't like parent references.
base::FilePath clean_extension_root(
base::MakeAbsoluteFilePath(extension_root));
if (clean_extension_root.empty())
return base::FilePath();
base::FilePath full_path = clean_extension_root.Append(relative_path);
// If we are allowing the file to be a symlink outside of the root, then the
// path before resolving the symlink must still be within it.
if (symlink_policy == FOLLOW_SYMLINKS_ANYWHERE) {
std::vector<base::FilePath::StringType> components;
relative_path.GetComponents(&components);
int depth = 0;
for (std::vector<base::FilePath::StringType>::const_iterator
i = components.begin(); i != components.end(); i++) {
if (*i == base::FilePath::kParentDirectory) {
depth--;
} else if (*i != base::FilePath::kCurrentDirectory) {
depth++;
}
if (depth < 0) {
return base::FilePath();
}
}
}
// We must resolve the absolute path of the combined path when
// the relative path contains references to a parent folder (i.e., '..').
// We also check if the path exists because the posix version of
// MakeAbsoluteFilePath will fail if the path doesn't exist, and we want the
// same behavior on Windows... So until the posix and Windows version of
// MakeAbsoluteFilePath are unified, we need an extra call to PathExists,
// unfortunately.
// TODO(mad): Fix this once MakeAbsoluteFilePath is unified.
full_path = base::MakeAbsoluteFilePath(full_path);
if (base::PathExists(full_path) &&
(symlink_policy == FOLLOW_SYMLINKS_ANYWHERE ||
clean_extension_root.IsParent(full_path))) {
return full_path;
}
return base::FilePath();
}
// Unit-testing helpers.
base::FilePath::StringType ExtensionResource::NormalizeSeperators(
const base::FilePath::StringType& path) const {
#if defined(FILE_PATH_USES_WIN_SEPARATORS)
base::FilePath::StringType win_path = path;
for (size_t i = 0; i < win_path.length(); i++) {
if (base::FilePath::IsSeparator(win_path[i]))
win_path[i] = base::FilePath::kSeparators[0];
}
return win_path;
#else
return path;
#endif // FILE_PATH_USES_WIN_SEPARATORS
}
bool ExtensionResource::ComparePathWithDefault(
const base::FilePath& path) const {
// Make sure we have a cached value to test against...
if (full_resource_path_.empty())
GetFilePath();
if (NormalizeSeperators(path.value()) ==
NormalizeSeperators(full_resource_path_.value())) {
return true;
} else {
return false;
}
}
} // namespace extensions
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