1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/download/drag_download_file.h"
#include "base/bind.h"
#include "base/files/file.h"
#include "base/message_loop/message_loop.h"
#include "content/browser/download/download_stats.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/download_item.h"
#include "content/public/browser/download_save_info.h"
#include "content/public/browser/download_url_parameters.h"
namespace content {
namespace {
typedef base::Callback<void(bool)> OnCompleted;
} // namespace
// On windows, DragDownloadFile runs on a thread other than the UI thread.
// DownloadItem and DownloadManager may not be accessed on any thread other than
// the UI thread. DragDownloadFile may run on either the "drag" thread or the UI
// thread depending on the platform, but DragDownloadFileUI strictly always runs
// on the UI thread. On platforms where DragDownloadFile runs on the UI thread,
// none of the PostTasks are necessary, but it simplifies the code to do them
// anyway.
class DragDownloadFile::DragDownloadFileUI : public DownloadItem::Observer {
public:
DragDownloadFileUI(const GURL& url,
const Referrer& referrer,
const std::string& referrer_encoding,
WebContents* web_contents,
base::MessageLoop* on_completed_loop,
const OnCompleted& on_completed)
: on_completed_loop_(on_completed_loop),
on_completed_(on_completed),
url_(url),
referrer_(referrer),
referrer_encoding_(referrer_encoding),
web_contents_(web_contents),
download_item_(NULL),
weak_ptr_factory_(this) {
DCHECK(on_completed_loop_);
DCHECK(!on_completed_.is_null());
DCHECK(web_contents_);
// May be called on any thread.
// Do not call weak_ptr_factory_.GetWeakPtr() outside the UI thread.
}
void InitiateDownload(base::File file,
const base::FilePath& file_path) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DownloadManager* download_manager =
BrowserContext::GetDownloadManager(web_contents_->GetBrowserContext());
RecordDownloadSource(INITIATED_BY_DRAG_N_DROP);
scoped_ptr<content::DownloadUrlParameters> params(
DownloadUrlParameters::FromWebContents(web_contents_, url_));
params->set_referrer(referrer_);
params->set_referrer_encoding(referrer_encoding_);
params->set_callback(base::Bind(&DragDownloadFileUI::OnDownloadStarted,
weak_ptr_factory_.GetWeakPtr()));
params->set_file_path(file_path);
params->set_file(file.Pass()); // Nulls file.
download_manager->DownloadUrl(params.Pass());
}
void Cancel() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (download_item_)
download_item_->Cancel(true);
}
void Delete() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
delete this;
}
private:
~DragDownloadFileUI() override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (download_item_)
download_item_->RemoveObserver(this);
}
void OnDownloadStarted(DownloadItem* item,
DownloadInterruptReason interrupt_reason) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!item) {
DCHECK_NE(DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
on_completed_loop_->PostTask(FROM_HERE, base::Bind(on_completed_, false));
return;
}
DCHECK_EQ(DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
download_item_ = item;
download_item_->AddObserver(this);
}
// DownloadItem::Observer:
void OnDownloadUpdated(DownloadItem* item) override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(download_item_, item);
DownloadItem::DownloadState state = download_item_->GetState();
if (state == DownloadItem::COMPLETE ||
state == DownloadItem::CANCELLED ||
state == DownloadItem::INTERRUPTED) {
if (!on_completed_.is_null()) {
on_completed_loop_->PostTask(FROM_HERE, base::Bind(
on_completed_, state == DownloadItem::COMPLETE));
on_completed_.Reset();
}
download_item_->RemoveObserver(this);
download_item_ = NULL;
}
// Ignore other states.
}
void OnDownloadDestroyed(DownloadItem* item) override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(download_item_, item);
if (!on_completed_.is_null()) {
const bool is_complete =
download_item_->GetState() == DownloadItem::COMPLETE;
on_completed_loop_->PostTask(FROM_HERE, base::Bind(
on_completed_, is_complete));
on_completed_.Reset();
}
download_item_->RemoveObserver(this);
download_item_ = NULL;
}
base::MessageLoop* on_completed_loop_;
OnCompleted on_completed_;
GURL url_;
Referrer referrer_;
std::string referrer_encoding_;
WebContents* web_contents_;
DownloadItem* download_item_;
// Only used in the callback from DownloadManager::DownloadUrl().
base::WeakPtrFactory<DragDownloadFileUI> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DragDownloadFileUI);
};
DragDownloadFile::DragDownloadFile(const base::FilePath& file_path,
base::File file,
const GURL& url,
const Referrer& referrer,
const std::string& referrer_encoding,
WebContents* web_contents)
: file_path_(file_path),
file_(file.Pass()),
drag_message_loop_(base::MessageLoop::current()),
state_(INITIALIZED),
drag_ui_(NULL),
weak_ptr_factory_(this) {
drag_ui_ = new DragDownloadFileUI(
url,
referrer,
referrer_encoding,
web_contents,
drag_message_loop_,
base::Bind(&DragDownloadFile::DownloadCompleted,
weak_ptr_factory_.GetWeakPtr()));
DCHECK(!file_path_.empty());
}
DragDownloadFile::~DragDownloadFile() {
CheckThread();
// This is the only place that drag_ui_ can be deleted from. Post a message to
// the UI thread so that it calls RemoveObserver on the right thread, and so
// that this task will run after the InitiateDownload task runs on the UI
// thread.
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
&DragDownloadFileUI::Delete, base::Unretained(drag_ui_)));
drag_ui_ = NULL;
}
void DragDownloadFile::Start(ui::DownloadFileObserver* observer) {
CheckThread();
if (state_ != INITIALIZED)
return;
state_ = STARTED;
DCHECK(!observer_.get());
observer_ = observer;
DCHECK(observer_.get());
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
&DragDownloadFileUI::InitiateDownload, base::Unretained(drag_ui_),
base::Passed(&file_), file_path_));
}
bool DragDownloadFile::Wait() {
CheckThread();
if (state_ == STARTED)
nested_loop_.Run();
return state_ == SUCCESS;
}
void DragDownloadFile::Stop() {
CheckThread();
if (drag_ui_) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
&DragDownloadFileUI::Cancel, base::Unretained(drag_ui_)));
}
}
void DragDownloadFile::DownloadCompleted(bool is_successful) {
CheckThread();
state_ = is_successful ? SUCCESS : FAILURE;
if (is_successful)
observer_->OnDownloadCompleted(file_path_);
else
observer_->OnDownloadAborted();
// Release the observer since we do not need it any more.
observer_ = NULL;
if (nested_loop_.running())
nested_loop_.Quit();
}
void DragDownloadFile::CheckThread() {
#if defined(OS_WIN)
DCHECK(drag_message_loop_ == base::MessageLoop::current());
#else
DCHECK_CURRENTLY_ON(BrowserThread::UI);
#endif
}
} // namespace content
|
