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1 // Copyright (c) 2013 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/loader/offline_policy.h" | |
6 | |
7 #include "base/command_line.h" | |
8 #include "content/public/common/content_switches.h" | |
9 #include "net/base/load_flags.h" | |
10 #include "net/http/http_response_info.h" | |
11 #include "net/url_request/url_request.h" | |
12 | |
13 namespace content { | |
14 | |
15 OfflinePolicy::OfflinePolicy() | |
16 : offline_state_(INIT) {} | |
17 | |
18 OfflinePolicy::~OfflinePolicy() {} | |
19 | |
20 int OfflinePolicy::GetAdditionalLoadFlags( | |
21 int current_flags, ResourceType::Type resource_type) { | |
22 | |
23 // Don't do anything if offline mode is disabled. | |
24 if (!CommandLine::ForCurrentProcess()->HasSwitch( | |
darin (slow to review)
2013/04/11 20:01:23
it seems like this switch could just be checked on
Randy Smith (Not in Mondays)
2013/04/12 14:06:44
Done.
| |
25 switches::kEnableOfflineCacheAccess)) | |
26 return 0; | |
27 | |
28 if (resource_type == ResourceType::MAIN_FRAME) | |
29 offline_state_ = INIT; | |
30 | |
31 // If a consumer has requested something contradictory, it wins; we | |
32 // don't modify the load flags. | |
33 if (current_flags & | |
34 (net::LOAD_BYPASS_CACHE | net::LOAD_PREFERRING_CACHE | | |
35 net::LOAD_ONLY_FROM_CACHE | net::LOAD_FROM_CACHE_IF_OFFLINE | | |
36 net::LOAD_DISABLE_CACHE)) { | |
37 return 0; | |
38 } | |
39 | |
40 switch(offline_state_) { | |
41 case INIT: | |
42 return net::LOAD_FROM_CACHE_IF_OFFLINE; | |
43 case ONLINE: | |
44 return 0; | |
45 case OFFLINE: | |
46 return net::LOAD_ONLY_FROM_CACHE; | |
47 } | |
48 NOTREACHED(); | |
49 return 0; | |
50 } | |
51 | |
52 void OfflinePolicy::RequestCompleted( | |
53 const net::HttpResponseInfo& response_info) { | |
54 // Don't do anything if offline mode is disabled. | |
55 if (!CommandLine::ForCurrentProcess()->HasSwitch( | |
56 switches::kEnableOfflineCacheAccess)) | |
57 return; | |
58 | |
59 if (offline_state_ != INIT) | |
60 // We've already made the decision for the rest of this set | |
61 // of navigations. | |
62 return; | |
63 | |
64 if (response_info.server_data_unavailable) { | |
65 offline_state_ = OFFLINE; | |
66 } else if (response_info.network_accessed) { | |
67 // If we got the response from the network or validated it as part | |
68 // of this request, that means our connection to the host is working. | |
69 offline_state_ = ONLINE; | |
70 } | |
71 } | |
72 | |
73 } // namespace content | |
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