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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/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 base::string16& metadata,
     27                            base::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 == base::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 == base::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     base::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       base::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
    122