mediaview: Introduce ArcDocumentsProviderRoot.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root_map.cc

+// Copyright 2016 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/chromeos/arc/fileapi/arc_documents_provider_root_map.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.h"
+
+namespace arc {
+
+namespace {
+
+struct DocumentsProviderSpec {
+  const char* authority;
+  const char* root_document_id;
+};
+
+// List of allowed documents providers for production.
+constexpr DocumentsProviderSpec kDocumentsProviderWhitelist[] = {
+    {"com.android.providers.media.documents", "images_root"},
+    {"com.android.providers.media.documents", "videos_root"},
+    {"com.android.providers.media.documents", "audio_root"},
+};
+
+}  // namespace
+
+ArcDocumentsProviderRootMap::ArcDocumentsProviderRootMap() {
+  for (auto spec : kDocumentsProviderWhitelist) {
+    map_[Key(spec.authority, spec.root_document_id)] =
+        base::MakeUnique<ArcDocumentsProviderRoot>(spec.authority,
+                                                   spec.root_document_id);
+  }
+}
+
+ArcDocumentsProviderRootMap::~ArcDocumentsProviderRootMap() = default;
+
+ArcDocumentsProviderRoot* ArcDocumentsProviderRootMap::ParseAndLookup(
+    const storage::FileSystemURL& url,
+    base::FilePath* path) const {
+  std::string authority;
+  std::string root_document_id;
+  base::FilePath tmp_path;
+  if (!ParseDocumentsProviderUrl(url, &authority, &root_document_id, &tmp_path))
+    return nullptr;
+  auto iter = map_.find(Key(authority, root_document_id));
+  if (iter == map_.end())
+    return nullptr;
+  *path = tmp_path;
+  return iter->second.get();
+}
+
+}  // namespace arc