src/chrome/renderer/net/net_error_helper.cc

   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 "chrome/renderer/net/net_error_helper.h"
   6
   7 #include <string>
   8
   9 #include "base/json/json_writer.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/values.h"
  13 #include "chrome/common/localized_error.h"
  14 #include "chrome/common/net/net_error_info.h"
  15 #include "chrome/common/render_messages.h"
  16 #include "content/public/common/content_client.h"
  17 #include "content/public/common/url_constants.h"
  18 #include "content/public/renderer/content_renderer_client.h"
  19 #include "content/public/renderer/render_thread.h"
  20 #include "content/public/renderer/render_view.h"
  21 #include "content/public/renderer/resource_fetcher.h"
  22 #include "grit/renderer_resources.h"
  23 #include "ipc/ipc_message.h"
  24 #include "ipc/ipc_message_macros.h"
  25 #include "third_party/WebKit/public/platform/WebURL.h"
  26 #include "third_party/WebKit/public/platform/WebURLError.h"
  27 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  28 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  29 #include "third_party/WebKit/public/web/WebDataSource.h"
  30 #include "third_party/WebKit/public/web/WebFrame.h"
  31 #include "third_party/WebKit/public/web/WebView.h"
  32 #include "ui/base/resource/resource_bundle.h"
  33 #include "ui/base/webui/jstemplate_builder.h"
  34 #include "url/gurl.h"
  35
  36 using base::JSONWriter;
  37 using chrome_common_net::DnsProbeStatus;
  38 using chrome_common_net::DnsProbeStatusToString;
  39 using content::RenderThread;
  40 using content::RenderView;
  41 using content::RenderViewObserver;
  42 using content::kUnreachableWebDataURL;
  43
  44 namespace {
  45
  46 // Number of seconds to wait for the alternate error page server.  If it takes
  47 // too long, just use the local error page.
  48 static const int kAlterErrorPageFetchTimeoutSec = 3000;
  49
  50 NetErrorHelperCore::PageType GetLoadingPageType(const blink::WebFrame* frame) {
  51   GURL url = frame->provisionalDataSource()->request().url();
  52   if (!url.is_valid() || url.spec() != kUnreachableWebDataURL)
  53     return NetErrorHelperCore::NON_ERROR_PAGE;
  54   return NetErrorHelperCore::ERROR_PAGE;
  55 }
  56
  57 NetErrorHelperCore::FrameType GetFrameType(const blink::WebFrame* frame) {
  58   if (!frame->parent())
  59     return NetErrorHelperCore::MAIN_FRAME;
  60   return NetErrorHelperCore::SUB_FRAME;
  61 }
  62
  63 }  // namespace
  64
  65 NetErrorHelper::NetErrorHelper(RenderView* render_view)
  66     : RenderViewObserver(render_view),
  67       content::RenderViewObserverTracker<NetErrorHelper>(render_view),
  68       core_(this) {
  69 }
  70
  71 NetErrorHelper::~NetErrorHelper() {
  72 }
  73
  74 void NetErrorHelper::DidStartProvisionalLoad(blink::WebFrame* frame) {
  75   core_.OnStartLoad(GetFrameType(frame), GetLoadingPageType(frame));
  76 }
  77
  78 void NetErrorHelper::DidCommitProvisionalLoad(blink::WebFrame* frame,
  79                                               bool is_new_navigation) {
  80   core_.OnCommitLoad(GetFrameType(frame));
  81 }
  82
  83 void NetErrorHelper::DidFinishLoad(blink::WebFrame* frame) {
  84   core_.OnFinishLoad(GetFrameType(frame));
  85 }
  86
  87 void NetErrorHelper::OnStop() {
  88   core_.OnStop();
  89 }
  90
  91 bool NetErrorHelper::OnMessageReceived(const IPC::Message& message) {
  92   bool handled = true;
  93
  94   IPC_BEGIN_MESSAGE_MAP(NetErrorHelper, message)
  95     IPC_MESSAGE_HANDLER(ChromeViewMsg_NetErrorInfo, OnNetErrorInfo)
  96     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAltErrorPageURL, OnSetAltErrorPageURL);
  97     IPC_MESSAGE_UNHANDLED(handled = false)
  98   IPC_END_MESSAGE_MAP()
  99
 100   return handled;
 101 }
 102
 103 void NetErrorHelper::GetErrorHTML(
 104     blink::WebFrame* frame,
 105     const blink::WebURLError& error,
 106     bool is_failed_post,
 107     std::string* error_html) {
 108   core_.GetErrorHTML(GetFrameType(frame), error, is_failed_post, error_html);
 109 }
 110
 111 void NetErrorHelper::GenerateLocalizedErrorPage(const blink::WebURLError& error,
 112                                                 bool is_failed_post,
 113                                                 std::string* error_html) const {
 114   error_html->clear();
 115
 116   int resource_id = IDR_NET_ERROR_HTML;
 117   const base::StringPiece template_html(
 118       ResourceBundle::GetSharedInstance().GetRawDataResource(resource_id));
 119   if (template_html.empty()) {
 120     NOTREACHED() << "unable to load template.";
 121   } else {
 122     base::DictionaryValue error_strings;
 123     LocalizedError::GetStrings(error.reason, error.domain.utf8(),
 124                                error.unreachableURL, is_failed_post,
 125                                RenderThread::Get()->GetLocale(),
 126                                render_view()->GetAcceptLanguages(),
 127                                &error_strings);
 128     // "t" is the id of the template's root node.
 129     *error_html = webui::GetTemplatesHtml(template_html, &error_strings, "t");
 130   }
 131 }
 132
 133 void NetErrorHelper::LoadErrorPageInMainFrame(const std::string& html,
 134                                               const GURL& failed_url) {
 135   blink::WebView* web_view = render_view()->GetWebView();
 136   if (!web_view)
 137     return;
 138   blink::WebFrame* frame = web_view->mainFrame();
 139   frame->loadHTMLString(html, GURL(kUnreachableWebDataURL), failed_url, true);
 140 }
 141
 142 void NetErrorHelper::UpdateErrorPage(const blink::WebURLError& error,
 143                                      bool is_failed_post) {
 144   base::DictionaryValue error_strings;
 145   LocalizedError::GetStrings(error.reason,
 146                              error.domain.utf8(),
 147                              error.unreachableURL,
 148                              is_failed_post,
 149                              RenderThread::Get()->GetLocale(),
 150                              render_view()->GetAcceptLanguages(),
 151                              &error_strings);
 152
 153   std::string json;
 154   JSONWriter::Write(&error_strings, &json);
 155
 156   std::string js = "if (window.updateForDnsProbe) "
 157                    "updateForDnsProbe(" + json + ");";
 158   base::string16 js16;
 159   if (!base::UTF8ToUTF16(js.c_str(), js.length(), &js16)) {
 160     NOTREACHED();
 161     return;
 162   }
 163
 164   base::string16 frame_xpath;
 165   render_view()->EvaluateScript(frame_xpath, js16, 0, false);
 166 }
 167
 168 void NetErrorHelper::FetchErrorPage(const GURL& url) {
 169   DCHECK(!alt_error_page_fetcher_.get());
 170
 171   blink::WebView* web_view = render_view()->GetWebView();
 172   if (!web_view)
 173     return;
 174   blink::WebFrame* frame = web_view->mainFrame();
 175
 176   alt_error_page_fetcher_.reset(
 177       content::ResourceFetcher::Create(
 178           url, frame, blink::WebURLRequest::TargetIsMainFrame,
 179           base::Bind(&NetErrorHelper::OnAlternateErrorPageRetrieved,
 180                      base::Unretained(this))));
 181
 182   alt_error_page_fetcher_->SetTimeout(
 183       base::TimeDelta::FromSeconds(kAlterErrorPageFetchTimeoutSec));
 184 }
 185
 186 void NetErrorHelper::CancelFetchErrorPage() {
 187   alt_error_page_fetcher_.reset();
 188 }
 189
 190 void NetErrorHelper::OnNetErrorInfo(int status_num) {
 191   DCHECK(status_num >= 0 && status_num < chrome_common_net::DNS_PROBE_MAX);
 192
 193   DVLOG(1) << "Received status " << DnsProbeStatusToString(status_num);
 194
 195   core_.OnNetErrorInfo(static_cast<DnsProbeStatus>(status_num));
 196 }
 197
 198 void NetErrorHelper::OnSetAltErrorPageURL(const GURL& alt_error_page_url) {
 199   core_.set_alt_error_page_url(alt_error_page_url);
 200 }
 201
 202 void NetErrorHelper::OnAlternateErrorPageRetrieved(
 203     const blink::WebURLResponse& response,
 204     const std::string& data) {
 205   // The fetcher may only be deleted after |data| is passed to |core_|.  Move
 206   // it to a temporary to prevent any potential re-entrancy issues.
 207   scoped_ptr<content::ResourceFetcher> fetcher(
 208       alt_error_page_fetcher_.release());
 209   if (!response.isNull() && response.httpStatusCode() == 200) {
 210     core_.OnAlternateErrorPageFetched(data);
 211   } else {
 212     core_.OnAlternateErrorPageFetched("");
 213   }
 214 }