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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 : enabled_(CommandLine::ForCurrentProcess()->HasSwitch( |
| 17 switches::kEnableOfflineCacheAccess)), |
| 18 state_(INIT) {} |
| 19 |
| 20 OfflinePolicy::~OfflinePolicy() {} |
| 21 |
| 22 int OfflinePolicy::GetAdditionalLoadFlags(int current_flags, |
| 23 bool reset_state) { |
| 24 |
| 25 // Don't do anything if offline mode is disabled. |
| 26 if (!enabled_) |
| 27 return 0; |
| 28 |
| 29 if (reset_state) |
| 30 state_ = INIT; |
| 31 |
| 32 // If a consumer has requested something contradictory, it wins; we |
| 33 // don't modify the load flags. |
| 34 if (current_flags & |
| 35 (net::LOAD_BYPASS_CACHE | net::LOAD_PREFERRING_CACHE | |
| 36 net::LOAD_ONLY_FROM_CACHE | net::LOAD_FROM_CACHE_IF_OFFLINE | |
| 37 net::LOAD_DISABLE_CACHE)) { |
| 38 return 0; |
| 39 } |
| 40 |
| 41 switch(state_) { |
| 42 case INIT: |
| 43 return net::LOAD_FROM_CACHE_IF_OFFLINE; |
| 44 case ONLINE: |
| 45 return 0; |
| 46 case OFFLINE: |
| 47 return net::LOAD_ONLY_FROM_CACHE; |
| 48 } |
| 49 NOTREACHED(); |
| 50 return 0; |
| 51 } |
| 52 |
| 53 void OfflinePolicy::UpdateStateForCompletedRequest( |
| 54 const net::HttpResponseInfo& response_info) { |
| 55 // Don't do anything if offline mode is disabled. |
| 56 if (!enabled_) |
| 57 return; |
| 58 |
| 59 if (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 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 state_ = ONLINE; |
| 70 } |
| 71 } |
| 72 |
| 73 } // namespace content |
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