chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_path.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "chrome/browser/chromeos/drive/file_system_util.h"
  11 #include "chrome/browser/chromeos/drive/fileapi/async_file_util.h"
  12 #include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
  13 #include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_reader_impl.h"
  14 #include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.h"
  15 #include "components/drive/drive_api_util.h"
  16 #include "components/drive/file_system_interface.h"
  17 #include "content/public/browser/browser_thread.h"
  18 #include "storage/browser/fileapi/async_file_util.h"
  19 #include "storage/browser/fileapi/file_stream_reader.h"
  20 #include "storage/browser/fileapi/file_system_context.h"
  21 #include "storage/browser/fileapi/file_system_url.h"
  22
  23 using content::BrowserThread;
  24
  25 namespace drive {
  26 namespace {
  27
  28 // Called on the UI thread after GetRedirectURLForContentsOnUIThread. Obtains
  29 // the browser URL from |entry|. |callback| will be called on the IO thread.
  30 void GetRedirectURLForContentsOnUIThreadWithResourceEntry(
  31     const storage::URLCallback& callback,
  32     FileError error,
  33     scoped_ptr<ResourceEntry> entry) {
  34   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  35   GURL url;
  36   if (error == FILE_ERROR_OK && entry->has_file_specific_info() &&
  37       entry->file_specific_info().is_hosted_document()) {
  38     url = GURL(entry->file_specific_info().alternate_url());
  39   }
  40   BrowserThread::PostTask(
  41       BrowserThread::IO, FROM_HERE, base::Bind(callback, url));
  42 }
  43
  44 // Called on the UI thread after
  45 // FileSystemBackendDelegate::GetRedirectURLForContents.  Requestes to obtain
  46 // ResourceEntry for the |url|.
  47 void GetRedirectURLForContentsOnUIThread(
  48     const storage::FileSystemURL& url,
  49     const storage::URLCallback& callback) {
  50   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  51   FileSystemInterface* const file_system =
  52       fileapi_internal::GetFileSystemFromUrl(url);
  53   if (!file_system) {
  54     BrowserThread::PostTask(
  55         BrowserThread::IO, FROM_HERE, base::Bind(callback, GURL()));
  56     return;
  57   }
  58   const base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
  59   if (file_path.empty()) {
  60     BrowserThread::PostTask(
  61         BrowserThread::IO, FROM_HERE, base::Bind(callback, GURL()));
  62     return;
  63   }
  64
  65   file_system->GetResourceEntry(
  66       file_path,
  67       base::Bind(&GetRedirectURLForContentsOnUIThreadWithResourceEntry,
  68                  callback));
  69 }
  70
  71 }  // namespace
  72
  73 FileSystemBackendDelegate::FileSystemBackendDelegate()
  74     : async_file_util_(new internal::AsyncFileUtil) {
  75 }
  76
  77 FileSystemBackendDelegate::~FileSystemBackendDelegate() {
  78 }
  79
  80 storage::AsyncFileUtil* FileSystemBackendDelegate::GetAsyncFileUtil(
  81     storage::FileSystemType type) {
  82   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  83   DCHECK_EQ(storage::kFileSystemTypeDrive, type);
  84   return async_file_util_.get();
  85 }
  86
  87 scoped_ptr<storage::FileStreamReader>
  88 FileSystemBackendDelegate::CreateFileStreamReader(
  89     const storage::FileSystemURL& url,
  90     int64 offset,
  91     int64 max_bytes_to_read,
  92     const base::Time& expected_modification_time,
  93     storage::FileSystemContext* context) {
  94   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  95   DCHECK_EQ(storage::kFileSystemTypeDrive, url.type());
  96
  97   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
  98   if (file_path.empty())
  99     return scoped_ptr<storage::FileStreamReader>();
 100
 101   return scoped_ptr<storage::FileStreamReader>(
 102       new internal::WebkitFileStreamReaderImpl(
 103           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
 104           context->default_file_task_runner(),
 105           file_path,
 106           offset,
 107           expected_modification_time));
 108 }
 109
 110 scoped_ptr<storage::FileStreamWriter>
 111 FileSystemBackendDelegate::CreateFileStreamWriter(
 112     const storage::FileSystemURL& url,
 113     int64 offset,
 114     storage::FileSystemContext* context) {
 115   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 116   DCHECK_EQ(storage::kFileSystemTypeDrive, url.type());
 117
 118   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
 119   // Hosted documents don't support stream writer.
 120   if (file_path.empty() || util::HasHostedDocumentExtension(file_path))
 121     return scoped_ptr<storage::FileStreamWriter>();
 122
 123   return scoped_ptr<storage::FileStreamWriter>(
 124       new internal::WebkitFileStreamWriterImpl(
 125           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
 126           context->default_file_task_runner(),
 127           file_path,
 128           offset));
 129 }
 130
 131 storage::WatcherManager* FileSystemBackendDelegate::GetWatcherManager(
 132     storage::FileSystemType type) {
 133   NOTIMPLEMENTED();
 134   return NULL;
 135 }
 136
 137 void FileSystemBackendDelegate::GetRedirectURLForContents(
 138     const storage::FileSystemURL& url,
 139     const storage::URLCallback& callback) {
 140   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 141   BrowserThread::PostTask(
 142       BrowserThread::UI,
 143       FROM_HERE,
 144       base::Bind(&GetRedirectURLForContentsOnUIThread, url, callback));
 145 }
 146
 147 }  // namespace drive