[fsp] Add FileSystemURLParser to the file system provider.

chrome/browser/chromeos/file_system_provider/mount_path_util.cc

 // 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 "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 
-#include "base/files/file_path.h"
+#include <vector>
+
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system.h"
+#include "chrome/browser/chromeos/file_system_provider/service.h"
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
 
 namespace chromeos {
 namespace file_system_provider {
 namespace util {
 
 namespace {
 
 // Root mount path for all of the provided file systems.
 const base::FilePath::CharType kProvidedMountPointRoot[] =
     FILE_PATH_LITERAL("/provided");
 
 }  // namespace
 
-base::FilePath GetMountPointPath(Profile* profile,
-                                 std::string extension_id,
-                                 int file_system_id) {
+base::FilePath GetMountPath(Profile* profile,
+                            std::string extension_id,
+                            int file_system_id) {
   chromeos::User* const user =
       chromeos::UserManager::IsInitialized()
           ? chromeos::UserManager::Get()->GetUserByProfile(
                 profile->GetOriginalProfile())
           : NULL;
   const std::string user_suffix = user ? "-" + user->username_hash() : "";
   return base::FilePath(kProvidedMountPointRoot).AppendASCII(
       extension_id + "-" + base::IntToString(file_system_id) + user_suffix);
 }
 
+FileSystemURLParser::FileSystemURLParser(const fileapi::FileSystemURL& url)
+    : url_(url), file_system_(NULL) {}
+
+FileSystemURLParser::~FileSystemURLParser() {}
+
+bool FileSystemURLParser::Parse() {
+  if (url_.type() != fileapi::kFileSystemTypeProvided)
+    return false;
+
+  // First, find the service handling the mount point of the URL.
+  const std::vector<Profile*>& profiles =
+      g_browser_process->profile_manager()->GetLoadedProfiles();
+
+  for (size_t i = 0; i < profiles.size(); ++i) {
+    Profile* original_profile = profiles[i]->GetOriginalProfile();
+
+    if (original_profile != profiles[i] ||
+        chromeos::ProfileHelper::IsSigninProfile(original_profile)) {
+      continue;
+    }
+
+    Service* service = Service::Get(original_profile);
+    if (!service)
+      continue;
+
+    ProvidedFileSystemInterface* file_system =
+        service->GetProvidedFileSystem(url_.filesystem_id());
+    if (!file_system)
+      continue;
+
+    // Strip the mount point name from the virtual path, to extract the file
+    // path within the provided file system.
+    file_system_ = file_system;
+    std::vector<base::FilePath::StringType> components;
+    url_.virtual_path().GetComponents(&components);
+    DCHECK_LT(0u, components.size());
+    file_path_ = base::FilePath();
+    for (size_t i = 1; i < components.size(); ++i) {
+      // TODO(mtomasz): This could be optimized, to avoid unnecessary copies.
+      file_path_ = file_path_.Append(components[i]);
+    }
+
+    return true;
+  }
+
+  // Nothing has been found.
+  return false;
+}
+
 }  // namespace util
 }  // namespace file_system_provider
 }  // namespace chromeos