content/browser/download/drag_download_util.cc

   1 // Copyright (c) 2012 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 "content/browser/download/drag_download_util.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/file_util.h"
  11 #include "base/files/file_path.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/threading/thread_restrictions.h"
  17 #include "content/public/browser/browser_thread.h"
  18 #include "net/base/file_stream.h"
  19 #include "net/base/net_errors.h"
  20 #include "url/gurl.h"
  21
  22 using net::FileStream;
  23
  24 namespace content {
  25
  26 bool ParseDownloadMetadata(const string16& metadata,
  27                            string16* mime_type,
  28                            base::FilePath* file_name,
  29                            GURL* url) {
  30   const char16 separator = L':';
  31
  32   size_t mime_type_end_pos = metadata.find(separator);
  33   if (mime_type_end_pos == string16::npos)
  34     return false;
  35
  36   size_t file_name_end_pos = metadata.find(separator, mime_type_end_pos + 1);
  37   if (file_name_end_pos == string16::npos)
  38     return false;
  39
  40   GURL parsed_url = GURL(metadata.substr(file_name_end_pos + 1));
  41   if (!parsed_url.is_valid())
  42     return false;
  43
  44   if (mime_type)
  45     *mime_type = metadata.substr(0, mime_type_end_pos);
  46   if (file_name) {
  47     string16 file_name_str = metadata.substr(
  48         mime_type_end_pos + 1, file_name_end_pos - mime_type_end_pos  - 1);
  49 #if defined(OS_WIN)
  50     *file_name = base::FilePath(file_name_str);
  51 #else
  52     *file_name = base::FilePath(UTF16ToUTF8(file_name_str));
  53 #endif
  54   }
  55   if (url)
  56     *url = parsed_url;
  57
  58   return true;
  59 }
  60
  61 FileStream* CreateFileStreamForDrop(base::FilePath* file_path,
  62                                     net::NetLog* net_log) {
  63   DCHECK(file_path && !file_path->empty());
  64
  65   scoped_ptr<FileStream> file_stream(new FileStream(net_log));
  66   const int kMaxSeq = 99;
  67   for (int seq = 0; seq <= kMaxSeq; seq++) {
  68     base::FilePath new_file_path;
  69     if (seq == 0) {
  70       new_file_path = *file_path;
  71     } else {
  72 #if defined(OS_WIN)
  73       string16 suffix = ASCIIToUTF16("-") + base::IntToString16(seq);
  74 #else
  75       std::string suffix = std::string("-") + base::IntToString(seq);
  76 #endif
  77       new_file_path = file_path->InsertBeforeExtension(suffix);
  78     }
  79
  80     // http://crbug.com/110709
  81     base::ThreadRestrictions::ScopedAllowIO allow_io;
  82
  83     // Explicitly (and redundantly check) for file -- despite the fact that our
  84     // open won't overwrite -- just to avoid log spew.
  85     if (!base::PathExists(new_file_path) &&
  86         file_stream->OpenSync(new_file_path, base::PLATFORM_FILE_CREATE |
  87                               base::PLATFORM_FILE_WRITE) == net::OK) {
  88       *file_path = new_file_path;
  89       return file_stream.release();
  90     }
  91   }
  92
  93   return NULL;
  94 }
  95
  96 PromiseFileFinalizer::PromiseFileFinalizer(
  97     DragDownloadFile* drag_file_downloader)
  98     : drag_file_downloader_(drag_file_downloader) {
  99 }
 100
 101 void PromiseFileFinalizer::OnDownloadCompleted(
 102     const base::FilePath& file_path) {
 103   BrowserThread::PostTask(
 104       BrowserThread::UI, FROM_HERE,
 105       base::Bind(&PromiseFileFinalizer::Cleanup, this));
 106 }
 107
 108 void PromiseFileFinalizer::OnDownloadAborted() {
 109   BrowserThread::PostTask(
 110       BrowserThread::UI, FROM_HERE,
 111       base::Bind(&PromiseFileFinalizer::Cleanup, this));
 112 }
 113
 114 PromiseFileFinalizer::~PromiseFileFinalizer() {}
 115
 116 void PromiseFileFinalizer::Cleanup() {
 117   if (drag_file_downloader_.get())
 118     drag_file_downloader_ = NULL;
 119 }
 120
 121 }  // namespace content