Adds resource_provider::ResourceProvider

components/resource_provider/file_utils.cc

+// Copyright 2015 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 "components/resource_provider/file_utils.h"
+
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/strings/string_util.h"
+#include "url/gurl.h"
+
+namespace resource_provider {
+namespace {
+
+bool IsPathNameValid(const std::string& name) {
+  if (name.empty() || name == "." || name == "..")
+    return false;
+
+  for (auto c : name) {
+    if (!IsAsciiAlpha(c) && !IsAsciiDigit(c) && c != '_' && c != '.')
+      return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+base::FilePath GetPathForApplicationUrl(const GURL& application_url) {
+  if (application_url.scheme() != "mojo")
+    return base::FilePath();
+
+  std::string path = application_url.path();
+  base::TrimString(path, "/", &path);
+
+  if (!IsPathNameValid(path))
+    return base::FilePath();
+
+  base::FilePath base_path;
+  PathService::Get(base::DIR_EXE, &base_path);
+  return base_path.AppendASCII(path).AppendASCII("resources");
+}
+
+base::FilePath GetPathForResourceNamed(const base::FilePath& app_path,
+                                       const std::string& resource_path) {
+  CHECK(!app_path.empty());
+
+  if (resource_path.empty() || resource_path[0] == '/' ||
+      resource_path.back() == '/' ||
+      resource_path.find("//") != std::string::npos)
+    return base::FilePath();
+
+  std::vector<std::string> path_components;
+  Tokenize(resource_path, "/", &path_components);
+  if (path_components.empty())
+    return base::FilePath();
+
+  base::FilePath result(app_path);
+  for (const auto& path_component : path_components) {
+    if (!IsPathNameValid(path_component))
+      return base::FilePath();
+    result = result.AppendASCII(path_component);
+  }
+  return result;
+}
+
+}  // namespace resource_provider