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      1 // Copyright (c) 2011 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/download/drag_download_util.h"
      6 
      7 #include "base/string_util.h"
      8 #include "base/file_path.h"
      9 #include "base/file_util.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/task.h"
     12 #include "base/string_number_conversions.h"
     13 #include "base/utf_string_conversions.h"
     14 #include "content/browser/browser_thread.h"
     15 #include "googleurl/src/gurl.h"
     16 #include "net/base/file_stream.h"
     17 #include "net/base/net_errors.h"
     18 
     19 using net::FileStream;
     20 
     21 namespace drag_download_util {
     22 
     23 bool ParseDownloadMetadata(const string16& metadata,
     24                            string16* mime_type,
     25                            FilePath* file_name,
     26                            GURL* url) {
     27   const char16 separator = L':';
     28 
     29   size_t mime_type_end_pos = metadata.find(separator);
     30   if (mime_type_end_pos == string16::npos)
     31     return false;
     32 
     33   size_t file_name_end_pos = metadata.find(separator, mime_type_end_pos + 1);
     34   if (file_name_end_pos == string16::npos)
     35     return false;
     36 
     37   GURL parsed_url = GURL(metadata.substr(file_name_end_pos + 1));
     38   if (!parsed_url.is_valid())
     39     return false;
     40 
     41   if (mime_type)
     42     *mime_type = metadata.substr(0, mime_type_end_pos);
     43   if (file_name) {
     44     string16 file_name_str = metadata.substr(
     45         mime_type_end_pos + 1, file_name_end_pos - mime_type_end_pos  - 1);
     46 #if defined(OS_WIN)
     47     *file_name = FilePath(file_name_str);
     48 #else
     49     *file_name = FilePath(UTF16ToUTF8(file_name_str));
     50 #endif
     51   }
     52   if (url)
     53     *url = parsed_url;
     54 
     55   return true;
     56 }
     57 
     58 FileStream* CreateFileStreamForDrop(FilePath* file_path) {
     59   DCHECK(file_path && !file_path->empty());
     60 
     61   scoped_ptr<FileStream> file_stream(new FileStream);
     62   const int kMaxSeq = 99;
     63   for (int seq = 0; seq <= kMaxSeq; seq++) {
     64     FilePath new_file_path;
     65     if (seq == 0) {
     66       new_file_path = *file_path;
     67     } else {
     68  #if defined(OS_WIN)
     69       string16 suffix = ASCIIToUTF16("-") + base::IntToString16(seq);
     70  #else
     71       std::string suffix = std::string("-") + base::IntToString(seq);
     72  #endif
     73       new_file_path = file_path->InsertBeforeExtension(suffix);
     74     }
     75 
     76     // Explicitly (and redundantly check) for file -- despite the fact that our
     77     // open won't overwrite -- just to avoid log spew.
     78     if (!file_util::PathExists(new_file_path) &&
     79         file_stream->Open(new_file_path, base::PLATFORM_FILE_CREATE |
     80                               base::PLATFORM_FILE_WRITE) == net::OK) {
     81       *file_path = new_file_path;
     82       return file_stream.release();
     83     }
     84   }
     85 
     86   return NULL;
     87 }
     88 
     89 PromiseFileFinalizer::PromiseFileFinalizer(
     90     DragDownloadFile* drag_file_downloader)
     91     : drag_file_downloader_(drag_file_downloader) {
     92 }
     93 
     94 PromiseFileFinalizer::~PromiseFileFinalizer() {}
     95 
     96 void PromiseFileFinalizer::Cleanup() {
     97   if (drag_file_downloader_.get())
     98     drag_file_downloader_ = NULL;
     99 }
    100 
    101 void PromiseFileFinalizer::OnDownloadCompleted(const FilePath& file_path) {
    102   BrowserThread::PostTask(
    103       BrowserThread::UI, FROM_HERE,
    104       NewRunnableMethod(this, &PromiseFileFinalizer::Cleanup));
    105 }
    106 
    107 void PromiseFileFinalizer::OnDownloadAborted() {
    108   BrowserThread::PostTask(
    109       BrowserThread::UI, FROM_HERE,
    110       NewRunnableMethod(this, &PromiseFileFinalizer::Cleanup));
    111 }
    112 
    113 }  // namespace drag_download_util
    114