storage/browser/fileapi/file_system_context_unittest.cc - chromium/src - Git at Google

 // Copyright 2013 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 "storage/browser/fileapi/file_system_context.h"

 #include <stddef.h>

 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "storage/browser/fileapi/external_mount_points.h"
 #include "storage/browser/fileapi/file_system_backend.h"
 #include "storage/browser/fileapi/isolated_context.h"
 #include "storage/browser/test/mock_quota_manager.h"
 #include "storage/browser/test/mock_special_storage_policy.h"
 #include "storage/browser/test/test_file_system_options.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #define FPL(x) FILE_PATH_LITERAL(x)

 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
 #define DRIVE FPL("C:")
 #else
 #define DRIVE
 #endif

 using storage::ExternalMountPoints;
 using storage::FileSystemBackend;
 using storage::FileSystemContext;
 using storage::FileSystemMountOption;
 using storage::FileSystemURL;
 using storage::IsolatedContext;

 namespace content {

 namespace {

 const char kTestOrigin[] = "http://chromium.org/";

 GURL CreateRawFileSystemURL(const std::string& type_str,
                             const std::string& fs_id) {
   std::string url_str = base::StringPrintf(
       "filesystem:http://chromium.org/%s/%s/root/file",
       type_str.c_str(),
       fs_id.c_str());
   return GURL(url_str);
 }

 class FileSystemContextTest : public testing::Test {
  public:
   FileSystemContextTest() = default;

   void SetUp() override {
     ASSERT_TRUE(data_dir_.CreateUniqueTempDir());

     storage_policy_ = new MockSpecialStoragePolicy();

     mock_quota_manager_ = new MockQuotaManager(
         false /* is_incognito */, data_dir_.GetPath(),
         base::ThreadTaskRunnerHandle::Get().get(), storage_policy_.get());
   }

  protected:
   FileSystemContext* CreateFileSystemContextForTest(
       storage::ExternalMountPoints* external_mount_points) {
     return new FileSystemContext(
         base::ThreadTaskRunnerHandle::Get().get(),
         base::ThreadTaskRunnerHandle::Get().get(), external_mount_points,
         storage_policy_.get(), mock_quota_manager_->proxy(),
         std::vector<std::unique_ptr<FileSystemBackend>>(),
         std::vector<storage::URLRequestAutoMountHandler>(), data_dir_.GetPath(),
         CreateAllowFileAccessOptions());
   }

   // Verifies a *valid* filesystem url has expected values.
   void ExpectFileSystemURLMatches(const FileSystemURL& url,
                                   const GURL& expect_origin,
                                   storage::FileSystemType expect_mount_type,
                                   storage::FileSystemType expect_type,
                                   const base::FilePath& expect_path,
                                   const base::FilePath& expect_virtual_path,
                                   const std::string& expect_filesystem_id) {
     EXPECT_TRUE(url.is_valid());

     EXPECT_EQ(expect_origin, url.origin());
     EXPECT_EQ(expect_mount_type, url.mount_type());
     EXPECT_EQ(expect_type, url.type());
     EXPECT_EQ(expect_path, url.path());
     EXPECT_EQ(expect_virtual_path, url.virtual_path());
     EXPECT_EQ(expect_filesystem_id, url.filesystem_id());
   }

  private:
   base::ScopedTempDir data_dir_;
   base::test::ScopedTaskEnvironment scoped_task_environment_;
   scoped_refptr<storage::SpecialStoragePolicy> storage_policy_;
   scoped_refptr<MockQuotaManager> mock_quota_manager_;
 };

 // It is not valid to pass nullptr ExternalMountPoints to FileSystemContext on
 // ChromeOS.
 #if !defined(OS_CHROMEOS)
 TEST_F(FileSystemContextTest, NullExternalMountPoints) {
   scoped_refptr<FileSystemContext> file_system_context(
       CreateFileSystemContextForTest(nullptr));

   // Cracking system external mount and isolated mount points should work.
   std::string isolated_name = "root";
   std::string isolated_id =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           storage::kFileSystemTypeNativeLocal,
           std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_name);
   // Register system external mount point.
   ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       "system",
       storage::kFileSystemTypeNativeLocal,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/sys/"))));

   FileSystemURL cracked_isolated = file_system_context->CrackURL(
       CreateRawFileSystemURL("isolated", isolated_id));

   ExpectFileSystemURLMatches(
       cracked_isolated,
       GURL(kTestOrigin),
       storage::kFileSystemTypeIsolated,
       storage::kFileSystemTypeNativeLocal,
       base::FilePath(DRIVE FPL("/test/isolated/root/file"))
           .NormalizePathSeparators(),
       base::FilePath::FromUTF8Unsafe(isolated_id)
           .Append(FPL("root/file"))
           .NormalizePathSeparators(),
       isolated_id);

   FileSystemURL cracked_external = file_system_context->CrackURL(
       CreateRawFileSystemURL("external", "system"));

   ExpectFileSystemURLMatches(
       cracked_external,
       GURL(kTestOrigin),
       storage::kFileSystemTypeExternal,
       storage::kFileSystemTypeNativeLocal,
       base::FilePath(DRIVE FPL("/test/sys/root/file"))
           .NormalizePathSeparators(),
       base::FilePath(FPL("system/root/file")).NormalizePathSeparators(),
       "system");

   IsolatedContext::GetInstance()->RevokeFileSystem(isolated_id);
   ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("system");
 }
 #endif  // !defiend(OS_CHROMEOS)

 TEST_F(FileSystemContextTest, FileSystemContextKeepsMountPointsAlive) {
   scoped_refptr<ExternalMountPoints> mount_points =
       ExternalMountPoints::CreateRefCounted();

   // Register system external mount point.
   ASSERT_TRUE(mount_points->RegisterFileSystem(
       "system",
       storage::kFileSystemTypeNativeLocal,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/sys/"))));

   scoped_refptr<FileSystemContext> file_system_context(
       CreateFileSystemContextForTest(mount_points.get()));

   // Release a MountPoints reference created in the test.
   mount_points = nullptr;

   // FileSystemContext should keep a reference to the |mount_points|, so it
   // should be able to resolve the URL.
   FileSystemURL cracked_external = file_system_context->CrackURL(
       CreateRawFileSystemURL("external", "system"));

   ExpectFileSystemURLMatches(
       cracked_external,
       GURL(kTestOrigin),
       storage::kFileSystemTypeExternal,
       storage::kFileSystemTypeNativeLocal,
       base::FilePath(DRIVE FPL("/test/sys/root/file"))
           .NormalizePathSeparators(),
       base::FilePath(FPL("system/root/file")).NormalizePathSeparators(),
       "system");

   // No need to revoke the registered filesystem since |mount_points| lifetime
   // is bound to this test.
 }

 TEST_F(FileSystemContextTest, CrackFileSystemURL) {
   scoped_refptr<ExternalMountPoints> external_mount_points(
       ExternalMountPoints::CreateRefCounted());
   scoped_refptr<FileSystemContext> file_system_context(
       CreateFileSystemContextForTest(external_mount_points.get()));

   // Register an isolated mount point.
   std::string isolated_file_system_name = "root";
   const std::string kIsolatedFileSystemID =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           storage::kFileSystemTypeNativeLocal,
           std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_file_system_name);
   // Register system external mount point.
   ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       "system",
       storage::kFileSystemTypeDrive,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/sys/"))));
   ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       "ext",
       storage::kFileSystemTypeNativeLocal,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/ext"))));
   // Register a system external mount point with the same name/id as the
   // registered isolated mount point.
   ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       kIsolatedFileSystemID,
       storage::kFileSystemTypeRestrictedNativeLocal,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/system/isolated"))));
   // Add a mount points with the same name as a system mount point to
   // FileSystemContext's external mount points.
   ASSERT_TRUE(external_mount_points->RegisterFileSystem(
       "ext",
       storage::kFileSystemTypeNativeLocal,
       FileSystemMountOption(),
       base::FilePath(DRIVE FPL("/test/local/ext/"))));

   const GURL kTestOrigin = GURL("http://chromium.org/");
   const base::FilePath kVirtualPathNoRoot = base::FilePath(FPL("root/file"));

   struct TestCase {
     // Test case values.
     std::string root;
     std::string type_str;

     // Expected test results.
     bool expect_is_valid;
     storage::FileSystemType expect_mount_type;
     storage::FileSystemType expect_type;
     const base::FilePath::CharType* expect_path;
     std::string expect_filesystem_id;
   };

   const TestCase kTestCases[] = {
       // Following should not be handled by the url crackers:
       {
        "pers_mount", "persistent", true /* is_valid */,
        storage::kFileSystemTypePersistent, storage::kFileSystemTypePersistent,
        FPL("pers_mount/root/file"), std::string() /* filesystem id */
       },
       {
        "temp_mount", "temporary", true /* is_valid */,
        storage::kFileSystemTypeTemporary, storage::kFileSystemTypeTemporary,
        FPL("temp_mount/root/file"), std::string() /* filesystem id */
       },
       // Should be cracked by isolated mount points:
       {kIsolatedFileSystemID, "isolated", true /* is_valid */,
        storage::kFileSystemTypeIsolated, storage::kFileSystemTypeNativeLocal,
        DRIVE FPL("/test/isolated/root/file"), kIsolatedFileSystemID},
       // Should be cracked by system mount points:
       {"system", "external", true /* is_valid */,
        storage::kFileSystemTypeExternal, storage::kFileSystemTypeDrive,
        DRIVE FPL("/test/sys/root/file"), "system"},
       {kIsolatedFileSystemID, "external", true /* is_valid */,
        storage::kFileSystemTypeExternal,
        storage::kFileSystemTypeRestrictedNativeLocal,
        DRIVE FPL("/test/system/isolated/root/file"), kIsolatedFileSystemID},
       // Should be cracked by FileSystemContext's ExternalMountPoints.
       {"ext", "external", true /* is_valid */, storage::kFileSystemTypeExternal,
        storage::kFileSystemTypeNativeLocal,
        DRIVE FPL("/test/local/ext/root/file"), "ext"},
       // Test for invalid filesystem url (made invalid by adding invalid
       // filesystem type).
       {"sytem", "external", false /* is_valid */,
        // The rest of values will be ignored.
        storage::kFileSystemTypeUnknown, storage::kFileSystemTypeUnknown,
        FPL(""), std::string()},
       // Test for URL with non-existing filesystem id.
       {"invalid", "external", false /* is_valid */,
        // The rest of values will be ignored.
        storage::kFileSystemTypeUnknown, storage::kFileSystemTypeUnknown,
        FPL(""), std::string()},
   };

   for (size_t i = 0; i < base::size(kTestCases); ++i) {
     const base::FilePath virtual_path =
         base::FilePath::FromUTF8Unsafe(
             kTestCases[i].root).Append(kVirtualPathNoRoot);

     GURL raw_url =
         CreateRawFileSystemURL(kTestCases[i].type_str, kTestCases[i].root);
     FileSystemURL cracked_url = file_system_context->CrackURL(raw_url);

     SCOPED_TRACE(testing::Message() << "Test case " << i << ": "
                                     << "Cracking URL: " << raw_url);

     EXPECT_EQ(kTestCases[i].expect_is_valid, cracked_url.is_valid());
     if (!kTestCases[i].expect_is_valid)
       continue;

     ExpectFileSystemURLMatches(
         cracked_url,
         GURL(kTestOrigin),
         kTestCases[i].expect_mount_type,
         kTestCases[i].expect_type,
         base::FilePath(kTestCases[i].expect_path).NormalizePathSeparators(),
         virtual_path.NormalizePathSeparators(),
         kTestCases[i].expect_filesystem_id);
   }

   IsolatedContext::GetInstance()->RevokeFileSystemByPath(
       base::FilePath(DRIVE FPL("/test/isolated/root")));
   ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("system");
   ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("ext");
   ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
       kIsolatedFileSystemID);
 }

 TEST_F(FileSystemContextTest, CanServeURLRequest) {
   scoped_refptr<ExternalMountPoints> external_mount_points(
       ExternalMountPoints::CreateRefCounted());
   scoped_refptr<FileSystemContext> context(
       CreateFileSystemContextForTest(external_mount_points.get()));

   // A request for a sandbox mount point should be served.
   FileSystemURL cracked_url =
       context->CrackURL(CreateRawFileSystemURL("persistent", "pers_mount"));
   EXPECT_EQ(storage::kFileSystemTypePersistent, cracked_url.mount_type());
   EXPECT_TRUE(context->CanServeURLRequest(cracked_url));

   // A request for an isolated mount point should NOT be served.
   std::string isolated_fs_name = "root";
   std::string isolated_fs_id =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           storage::kFileSystemTypeNativeLocal,
           std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_fs_name);
   cracked_url = context->CrackURL(
       CreateRawFileSystemURL("isolated", isolated_fs_id));
   EXPECT_EQ(storage::kFileSystemTypeIsolated, cracked_url.mount_type());
   EXPECT_FALSE(context->CanServeURLRequest(cracked_url));

   // A request for an external mount point should be served.
   const std::string kExternalMountName = "ext_mount";
   ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       kExternalMountName,
       storage::kFileSystemTypeDrive,
       FileSystemMountOption(),
       base::FilePath()));
   cracked_url = context->CrackURL(
       CreateRawFileSystemURL("external", kExternalMountName));
   EXPECT_EQ(storage::kFileSystemTypeExternal, cracked_url.mount_type());
   EXPECT_TRUE(context->CanServeURLRequest(cracked_url));

   ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
       kExternalMountName);
   IsolatedContext::GetInstance()->RevokeFileSystem(isolated_fs_id);
 }

 // Ensures that a backend exists for each common isolated file system type.
 // See http://crbug.com/447027
 TEST_F(FileSystemContextTest, IsolatedFileSystemsTypesHandled) {
   // This does not provide any "additional" file system handlers. In particular,
   // on Chrome OS it does not provide chromeos::FileSystemBackend.
   scoped_refptr<FileSystemContext> file_system_context(
       CreateFileSystemContextForTest(nullptr));

   // Isolated file system types are handled.
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeIsolated));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeDragged));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeForTransientFile));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeNativeLocal));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeNativeForPlatformApp));
 }

 }  // namespace

 }  // namespace content
	// Copyright 2013 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 "storage/browser/fileapi/file_system_context.h"

	#include <stddef.h>

	#include "base/files/scoped_temp_dir.h"
	#include "base/macros.h"
	#include "base/stl_util.h"
	#include "base/strings/stringprintf.h"
	#include "base/test/scoped_task_environment.h"
	#include "base/threading/thread_task_runner_handle.h"
	#include "build/build_config.h"
	#include "storage/browser/fileapi/external_mount_points.h"
	#include "storage/browser/fileapi/file_system_backend.h"
	#include "storage/browser/fileapi/isolated_context.h"
	#include "storage/browser/test/mock_quota_manager.h"
	#include "storage/browser/test/mock_special_storage_policy.h"
	#include "storage/browser/test/test_file_system_options.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#define FPL(x) FILE_PATH_LITERAL(x)

	#if defined(FILE_PATH_USES_DRIVE_LETTERS)
	#define DRIVE FPL("C:")
	#else
	#define DRIVE
	#endif

	using storage::ExternalMountPoints;
	using storage::FileSystemBackend;
	using storage::FileSystemContext;
	using storage::FileSystemMountOption;
	using storage::FileSystemURL;
	using storage::IsolatedContext;

	namespace content {

	namespace {

	const char kTestOrigin[] = "http://chromium.org/";

	GURL CreateRawFileSystemURL(const std::string& type_str,
	const std::string& fs_id) {
	std::string url_str = base::StringPrintf(
	"filesystem:http://chromium.org/%s/%s/root/file",
	type_str.c_str(),
	fs_id.c_str());
	return GURL(url_str);
	}

	class FileSystemContextTest : public testing::Test {
	public:
	FileSystemContextTest() = default;

	void SetUp() override {
	ASSERT_TRUE(data_dir_.CreateUniqueTempDir());

	storage_policy_ = new MockSpecialStoragePolicy();

	mock_quota_manager_ = new MockQuotaManager(
	false /* is_incognito */, data_dir_.GetPath(),
	base::ThreadTaskRunnerHandle::Get().get(), storage_policy_.get());
	}

	protected:
	FileSystemContext* CreateFileSystemContextForTest(
	storage::ExternalMountPoints* external_mount_points) {
	return new FileSystemContext(
	base::ThreadTaskRunnerHandle::Get().get(),
	base::ThreadTaskRunnerHandle::Get().get(), external_mount_points,
	storage_policy_.get(), mock_quota_manager_->proxy(),
	std::vector<std::unique_ptr<FileSystemBackend>>(),
	std::vector<storage::URLRequestAutoMountHandler>(), data_dir_.GetPath(),
	CreateAllowFileAccessOptions());
	}

	// Verifies a valid filesystem url has expected values.
	void ExpectFileSystemURLMatches(const FileSystemURL& url,
	const GURL& expect_origin,
	storage::FileSystemType expect_mount_type,
	storage::FileSystemType expect_type,
	const base::FilePath& expect_path,
	const base::FilePath& expect_virtual_path,
	const std::string& expect_filesystem_id) {
	EXPECT_TRUE(url.is_valid());

	EXPECT_EQ(expect_origin, url.origin());
	EXPECT_EQ(expect_mount_type, url.mount_type());
	EXPECT_EQ(expect_type, url.type());
	EXPECT_EQ(expect_path, url.path());
	EXPECT_EQ(expect_virtual_path, url.virtual_path());
	EXPECT_EQ(expect_filesystem_id, url.filesystem_id());
	}

	private:
	base::ScopedTempDir data_dir_;
	base::test::ScopedTaskEnvironment scoped_task_environment_;
	scoped_refptr<storage::SpecialStoragePolicy> storage_policy_;
	scoped_refptr<MockQuotaManager> mock_quota_manager_;
	};

	// It is not valid to pass nullptr ExternalMountPoints to FileSystemContext on
	// ChromeOS.
	#if !defined(OS_CHROMEOS)
	TEST_F(FileSystemContextTest, NullExternalMountPoints) {
	scoped_refptr<FileSystemContext> file_system_context(
	CreateFileSystemContextForTest(nullptr));

	// Cracking system external mount and isolated mount points should work.
	std::string isolated_name = "root";
	std::string isolated_id =
	IsolatedContext::GetInstance()->RegisterFileSystemForPath(
	storage::kFileSystemTypeNativeLocal,
	std::string(),
	base::FilePath(DRIVE FPL("/test/isolated/root")),
	&isolated_name);
	// Register system external mount point.
	ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
	"system",
	storage::kFileSystemTypeNativeLocal,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/sys/"))));

	FileSystemURL cracked_isolated = file_system_context->CrackURL(
	CreateRawFileSystemURL("isolated", isolated_id));

	ExpectFileSystemURLMatches(
	cracked_isolated,
	GURL(kTestOrigin),
	storage::kFileSystemTypeIsolated,
	storage::kFileSystemTypeNativeLocal,
	base::FilePath(DRIVE FPL("/test/isolated/root/file"))
	.NormalizePathSeparators(),
	base::FilePath::FromUTF8Unsafe(isolated_id)
	.Append(FPL("root/file"))
	.NormalizePathSeparators(),
	isolated_id);

	FileSystemURL cracked_external = file_system_context->CrackURL(
	CreateRawFileSystemURL("external", "system"));

	ExpectFileSystemURLMatches(
	cracked_external,
	GURL(kTestOrigin),
	storage::kFileSystemTypeExternal,
	storage::kFileSystemTypeNativeLocal,
	base::FilePath(DRIVE FPL("/test/sys/root/file"))
	.NormalizePathSeparators(),
	base::FilePath(FPL("system/root/file")).NormalizePathSeparators(),
	"system");

	IsolatedContext::GetInstance()->RevokeFileSystem(isolated_id);
	ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("system");
	}
	#endif // !defiend(OS_CHROMEOS)

	TEST_F(FileSystemContextTest, FileSystemContextKeepsMountPointsAlive) {
	scoped_refptr<ExternalMountPoints> mount_points =
	ExternalMountPoints::CreateRefCounted();

	// Register system external mount point.
	ASSERT_TRUE(mount_points->RegisterFileSystem(
	"system",
	storage::kFileSystemTypeNativeLocal,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/sys/"))));

	scoped_refptr<FileSystemContext> file_system_context(
	CreateFileSystemContextForTest(mount_points.get()));

	// Release a MountPoints reference created in the test.
	mount_points = nullptr;

	// FileSystemContext should keep a reference to the \|mount_points\|, so it
	// should be able to resolve the URL.
	FileSystemURL cracked_external = file_system_context->CrackURL(
	CreateRawFileSystemURL("external", "system"));

	ExpectFileSystemURLMatches(
	cracked_external,
	GURL(kTestOrigin),
	storage::kFileSystemTypeExternal,
	storage::kFileSystemTypeNativeLocal,
	base::FilePath(DRIVE FPL("/test/sys/root/file"))
	.NormalizePathSeparators(),
	base::FilePath(FPL("system/root/file")).NormalizePathSeparators(),
	"system");

	// No need to revoke the registered filesystem since \|mount_points\| lifetime
	// is bound to this test.
	}

	TEST_F(FileSystemContextTest, CrackFileSystemURL) {
	scoped_refptr<ExternalMountPoints> external_mount_points(
	ExternalMountPoints::CreateRefCounted());
	scoped_refptr<FileSystemContext> file_system_context(
	CreateFileSystemContextForTest(external_mount_points.get()));

	// Register an isolated mount point.
	std::string isolated_file_system_name = "root";
	const std::string kIsolatedFileSystemID =
	IsolatedContext::GetInstance()->RegisterFileSystemForPath(
	storage::kFileSystemTypeNativeLocal,
	std::string(),
	base::FilePath(DRIVE FPL("/test/isolated/root")),
	&isolated_file_system_name);
	// Register system external mount point.
	ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
	"system",
	storage::kFileSystemTypeDrive,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/sys/"))));
	ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
	"ext",
	storage::kFileSystemTypeNativeLocal,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/ext"))));
	// Register a system external mount point with the same name/id as the
	// registered isolated mount point.
	ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
	kIsolatedFileSystemID,
	storage::kFileSystemTypeRestrictedNativeLocal,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/system/isolated"))));
	// Add a mount points with the same name as a system mount point to
	// FileSystemContext's external mount points.
	ASSERT_TRUE(external_mount_points->RegisterFileSystem(
	"ext",
	storage::kFileSystemTypeNativeLocal,
	FileSystemMountOption(),
	base::FilePath(DRIVE FPL("/test/local/ext/"))));

	const GURL kTestOrigin = GURL("http://chromium.org/");
	const base::FilePath kVirtualPathNoRoot = base::FilePath(FPL("root/file"));

	struct TestCase {
	// Test case values.
	std::string root;
	std::string type_str;

	// Expected test results.
	bool expect_is_valid;
	storage::FileSystemType expect_mount_type;
	storage::FileSystemType expect_type;
	const base::FilePath::CharType* expect_path;
	std::string expect_filesystem_id;
	};

	const TestCase kTestCases[] = {
	// Following should not be handled by the url crackers:
	{
	"pers_mount", "persistent", true /* is_valid */,
	storage::kFileSystemTypePersistent, storage::kFileSystemTypePersistent,
	FPL("pers_mount/root/file"), std::string() /* filesystem id */
	},
	{
	"temp_mount", "temporary", true /* is_valid */,
	storage::kFileSystemTypeTemporary, storage::kFileSystemTypeTemporary,
	FPL("temp_mount/root/file"), std::string() /* filesystem id */
	},
	// Should be cracked by isolated mount points:
	{kIsolatedFileSystemID, "isolated", true /* is_valid */,
	storage::kFileSystemTypeIsolated, storage::kFileSystemTypeNativeLocal,
	DRIVE FPL("/test/isolated/root/file"), kIsolatedFileSystemID},
	// Should be cracked by system mount points:
	{"system", "external", true /* is_valid */,
	storage::kFileSystemTypeExternal, storage::kFileSystemTypeDrive,
	DRIVE FPL("/test/sys/root/file"), "system"},
	{kIsolatedFileSystemID, "external", true /* is_valid */,
	storage::kFileSystemTypeExternal,
	storage::kFileSystemTypeRestrictedNativeLocal,
	DRIVE FPL("/test/system/isolated/root/file"), kIsolatedFileSystemID},
	// Should be cracked by FileSystemContext's ExternalMountPoints.
	{"ext", "external", true /* is_valid */, storage::kFileSystemTypeExternal,
	storage::kFileSystemTypeNativeLocal,
	DRIVE FPL("/test/local/ext/root/file"), "ext"},
	// Test for invalid filesystem url (made invalid by adding invalid
	// filesystem type).
	{"sytem", "external", false /* is_valid */,
	// The rest of values will be ignored.
	storage::kFileSystemTypeUnknown, storage::kFileSystemTypeUnknown,
	FPL(""), std::string()},
	// Test for URL with non-existing filesystem id.
	{"invalid", "external", false /* is_valid */,
	// The rest of values will be ignored.
	storage::kFileSystemTypeUnknown, storage::kFileSystemTypeUnknown,
	FPL(""), std::string()},
	};

	for (size_t i = 0; i < base::size(kTestCases); ++i) {
	const base::FilePath virtual_path =
	base::FilePath::FromUTF8Unsafe(
	kTestCases[i].root).Append(kVirtualPathNoRoot);

	GURL raw_url =
	CreateRawFileSystemURL(kTestCases[i].type_str, kTestCases[i].root);
	FileSystemURL cracked_url = file_system_context->CrackURL(raw_url);

	SCOPED_TRACE(testing::Message() << "Test case " << i << ": "
	<< "Cracking URL: " << raw_url);

	EXPECT_EQ(kTestCases[i].expect_is_valid, cracked_url.is_valid());
	if (!kTestCases[i].expect_is_valid)
	continue;

	ExpectFileSystemURLMatches(
	cracked_url,
	GURL(kTestOrigin),
	kTestCases[i].expect_mount_type,
	kTestCases[i].expect_type,
	base::FilePath(kTestCases[i].expect_path).NormalizePathSeparators(),
	virtual_path.NormalizePathSeparators(),
	kTestCases[i].expect_filesystem_id);
	}

	IsolatedContext::GetInstance()->RevokeFileSystemByPath(
	base::FilePath(DRIVE FPL("/test/isolated/root")));
	ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("system");
	ExternalMountPoints::GetSystemInstance()->RevokeFileSystem("ext");
	ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
	kIsolatedFileSystemID);
	}

	TEST_F(FileSystemContextTest, CanServeURLRequest) {
	scoped_refptr<ExternalMountPoints> external_mount_points(
	ExternalMountPoints::CreateRefCounted());
	scoped_refptr<FileSystemContext> context(
	CreateFileSystemContextForTest(external_mount_points.get()));

	// A request for a sandbox mount point should be served.
	FileSystemURL cracked_url =
	context->CrackURL(CreateRawFileSystemURL("persistent", "pers_mount"));
	EXPECT_EQ(storage::kFileSystemTypePersistent, cracked_url.mount_type());
	EXPECT_TRUE(context->CanServeURLRequest(cracked_url));

	// A request for an isolated mount point should NOT be served.
	std::string isolated_fs_name = "root";
	std::string isolated_fs_id =
	IsolatedContext::GetInstance()->RegisterFileSystemForPath(
	storage::kFileSystemTypeNativeLocal,
	std::string(),
	base::FilePath(DRIVE FPL("/test/isolated/root")),
	&isolated_fs_name);
	cracked_url = context->CrackURL(
	CreateRawFileSystemURL("isolated", isolated_fs_id));
	EXPECT_EQ(storage::kFileSystemTypeIsolated, cracked_url.mount_type());
	EXPECT_FALSE(context->CanServeURLRequest(cracked_url));

	// A request for an external mount point should be served.
	const std::string kExternalMountName = "ext_mount";
	ASSERT_TRUE(ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
	kExternalMountName,
	storage::kFileSystemTypeDrive,
	FileSystemMountOption(),
	base::FilePath()));
	cracked_url = context->CrackURL(
	CreateRawFileSystemURL("external", kExternalMountName));
	EXPECT_EQ(storage::kFileSystemTypeExternal, cracked_url.mount_type());
	EXPECT_TRUE(context->CanServeURLRequest(cracked_url));

	ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
	kExternalMountName);
	IsolatedContext::GetInstance()->RevokeFileSystem(isolated_fs_id);
	}

	// Ensures that a backend exists for each common isolated file system type.
	// See http://crbug.com/447027
	TEST_F(FileSystemContextTest, IsolatedFileSystemsTypesHandled) {
	// This does not provide any "additional" file system handlers. In particular,
	// on Chrome OS it does not provide chromeos::FileSystemBackend.
	scoped_refptr<FileSystemContext> file_system_context(
	CreateFileSystemContextForTest(nullptr));

	// Isolated file system types are handled.
	EXPECT_TRUE(file_system_context->GetFileSystemBackend(
	storage::kFileSystemTypeIsolated));
	EXPECT_TRUE(file_system_context->GetFileSystemBackend(
	storage::kFileSystemTypeDragged));
	EXPECT_TRUE(file_system_context->GetFileSystemBackend(
	storage::kFileSystemTypeForTransientFile));
	EXPECT_TRUE(file_system_context->GetFileSystemBackend(
	storage::kFileSystemTypeNativeLocal));
	EXPECT_TRUE(file_system_context->GetFileSystemBackend(
	storage::kFileSystemTypeNativeForPlatformApp));
	}

	} // namespace

	} // namespace content