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      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/files/file.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 "url/gurl.h"
     19 
     20 namespace content {
     21 
     22 bool ParseDownloadMetadata(const base::string16& metadata,
     23                            base::string16* mime_type,
     24                            base::FilePath* file_name,
     25                            GURL* url) {
     26   const base::char16 separator = L':';
     27 
     28   size_t mime_type_end_pos = metadata.find(separator);
     29   if (mime_type_end_pos == base::string16::npos)
     30     return false;
     31 
     32   size_t file_name_end_pos = metadata.find(separator, mime_type_end_pos + 1);
     33   if (file_name_end_pos == base::string16::npos)
     34     return false;
     35 
     36   GURL parsed_url = GURL(metadata.substr(file_name_end_pos + 1));
     37   if (!parsed_url.is_valid())
     38     return false;
     39 
     40   if (mime_type)
     41     *mime_type = metadata.substr(0, mime_type_end_pos);
     42   if (file_name) {
     43     base::string16 file_name_str = metadata.substr(
     44         mime_type_end_pos + 1, file_name_end_pos - mime_type_end_pos  - 1);
     45 #if defined(OS_WIN)
     46     *file_name = base::FilePath(file_name_str);
     47 #else
     48     *file_name = base::FilePath(base::UTF16ToUTF8(file_name_str));
     49 #endif
     50   }
     51   if (url)
     52     *url = parsed_url;
     53 
     54   return true;
     55 }
     56 
     57 base::File CreateFileForDrop(base::FilePath* file_path) {
     58   DCHECK(file_path && !file_path->empty());
     59 
     60   const int kMaxSeq = 99;
     61   for (int seq = 0; seq <= kMaxSeq; seq++) {
     62     base::FilePath new_file_path;
     63     if (seq == 0) {
     64       new_file_path = *file_path;
     65     } else {
     66 #if defined(OS_WIN)
     67       base::string16 suffix =
     68           base::ASCIIToUTF16("-") + base::IntToString16(seq);
     69 #else
     70       std::string suffix = std::string("-") + base::IntToString(seq);
     71 #endif
     72       new_file_path = file_path->InsertBeforeExtension(suffix);
     73     }
     74 
     75     // http://crbug.com/110709
     76     base::ThreadRestrictions::ScopedAllowIO allow_io;
     77 
     78     base::File file(
     79         new_file_path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
     80     if (file.IsValid()) {
     81       *file_path = new_file_path;
     82       return file.Pass();
     83     }
     84   }
     85 
     86   return base::File();
     87 }
     88 
     89 PromiseFileFinalizer::PromiseFileFinalizer(
     90     DragDownloadFile* drag_file_downloader)
     91     : drag_file_downloader_(drag_file_downloader) {
     92 }
     93 
     94 void PromiseFileFinalizer::OnDownloadCompleted(
     95     const base::FilePath& file_path) {
     96   BrowserThread::PostTask(
     97       BrowserThread::UI, FROM_HERE,
     98       base::Bind(&PromiseFileFinalizer::Cleanup, this));
     99 }
    100 
    101 void PromiseFileFinalizer::OnDownloadAborted() {
    102   BrowserThread::PostTask(
    103       BrowserThread::UI, FROM_HERE,
    104       base::Bind(&PromiseFileFinalizer::Cleanup, this));
    105 }
    106 
    107 PromiseFileFinalizer::~PromiseFileFinalizer() {}
    108 
    109 void PromiseFileFinalizer::Cleanup() {
    110   if (drag_file_downloader_.get())
    111     drag_file_downloader_ = NULL;
    112 }
    113 
    114 }  // namespace content
    115