src/chrome/browser/chromeos/fileapi/external_file_url_request_job.h

   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 #ifndef CHROME_BROWSER_CHROMEOS_FILEAPI_EXTERNAL_FILE_URL_REQUEST_JOB_H_
   6 #define CHROME_BROWSER_CHROMEOS_FILEAPI_EXTERNAL_FILE_URL_REQUEST_JOB_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "chrome/browser/chromeos/drive/file_errors.h"
  14 #include "net/base/net_errors.h"
  15 #include "net/http/http_byte_range.h"
  16 #include "net/url_request/url_request_job.h"
  17 #include "storage/browser/blob/file_stream_reader.h"
  18 #include "storage/browser/fileapi/file_system_url.h"
  19
  20 namespace net {
  21 class IOBuffer;
  22 class NetworkDelegate;
  23 class URLRequest;
  24 }  // namespace net
  25
  26 namespace chromeos {
  27
  28 // ExternalFileURLRequestJob is the gateway between network-level drive:...
  29 // requests for drive resources and FileSystem.  It exposes content URLs
  30 // formatted as drive:<drive-file-path>.
  31 // The methods should be run on IO thread.
  32 // TODO(hirono): After removing MHTML support, stop to use the special
  33 // externalfile: scheme and use filesystem: URL directly.  crbug.com/415455
  34 class ExternalFileURLRequestJob : public net::URLRequestJob {
  35  public:
  36   // Scope of isolated file system.
  37   class IsolatedFileSystemScope {
  38    public:
  39     explicit IsolatedFileSystemScope(const std::string& file_system_id);
  40     ~IsolatedFileSystemScope();
  41
  42    private:
  43     std::string file_system_id_;
  44     DISALLOW_COPY_AND_ASSIGN(IsolatedFileSystemScope);
  45   };
  46
  47   // Callback to take results from an internal helper defined in
  48   // drive_url_request_job.cc.
  49   typedef base::Callback<void(
  50       net::Error,
  51       const scoped_refptr<storage::FileSystemContext>& file_system_context,
  52       scoped_ptr<IsolatedFileSystemScope> isolated_file_system_scope,
  53       const storage::FileSystemURL& file_system_url,
  54       const std::string& mime_type)> HelperCallback;
  55
  56   ExternalFileURLRequestJob(void* profile_id,
  57                             net::URLRequest* request,
  58                             net::NetworkDelegate* network_delegate);
  59
  60   // net::URLRequestJob overrides:
  61   virtual void SetExtraRequestHeaders(
  62       const net::HttpRequestHeaders& headers) override;
  63   virtual void Start() override;
  64   virtual void Kill() override;
  65   virtual bool GetMimeType(std::string* mime_type) const override;
  66   virtual bool IsRedirectResponse(GURL* location,
  67                                   int* http_status_code) override;
  68   virtual bool ReadRawData(net::IOBuffer* buf,
  69                            int buf_size,
  70                            int* bytes_read) override;
  71
  72  protected:
  73   virtual ~ExternalFileURLRequestJob();
  74
  75  private:
  76   // Called from an internal helper class defined in drive_url_request_job.cc,
  77   // which is running on the UI thread.
  78   void OnHelperResultObtained(
  79       net::Error error,
  80       const scoped_refptr<storage::FileSystemContext>& file_system_context,
  81       scoped_ptr<IsolatedFileSystemScope> isolated_file_system_scope,
  82       const storage::FileSystemURL& file_system_url,
  83       const std::string& mime_type);
  84
  85   // Called from FileSystemBackend::GetRedirectURLForContents.
  86   void OnRedirectURLObtained(const GURL& redirect_url);
  87
  88   // Called from DriveURLRequestJob::OnFileInfoObtained.
  89   void OnFileInfoObtained(base::File::Error result,
  90                           const base::File::Info& file_info);
  91
  92   // Called when DriveFileStreamReader::Read is completed.
  93   void OnReadCompleted(int read_result);
  94
  95   void* const profile_id_;
  96
  97   // The range of the file to be returned.
  98   net::HttpByteRange byte_range_;
  99   int64 remaining_bytes_;
 100
 101   scoped_refptr<storage::FileSystemContext> file_system_context_;
 102   scoped_ptr<IsolatedFileSystemScope> isolated_file_system_scope_;
 103   storage::FileSystemURL file_system_url_;
 104   std::string mime_type_;
 105   scoped_ptr<storage::FileStreamReader> stream_reader_;
 106   GURL redirect_url_;
 107
 108   // This should remain the last member so it'll be destroyed first and
 109   // invalidate its weak pointers before other members are destroyed.
 110   base::WeakPtrFactory<ExternalFileURLRequestJob> weak_ptr_factory_;
 111   DISALLOW_COPY_AND_ASSIGN(ExternalFileURLRequestJob);
 112 };
 113
 114 }  // namespace chromeos
 115
 116 #endif  // CHROME_BROWSER_CHROMEOS_FILEAPI_EXTERNAL_FILE_URL_REQUEST_JOB_H_