src/chrome/renderer/chrome_render_view_observer.cc

   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 "chrome/renderer/chrome_render_view_observer.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/command_line.h"
  10 #include "base/debug/trace_event.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "chrome/common/chrome_constants.h"
  16 #include "chrome/common/chrome_switches.h"
  17 #include "chrome/common/prerender_messages.h"
  18 #include "chrome/common/render_messages.h"
  19 #include "chrome/common/url_constants.h"
  20 #include "chrome/renderer/isolated_world_ids.h"
  21 #include "chrome/renderer/prerender/prerender_helper.h"
  22 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
  23 #include "chrome/renderer/web_apps.h"
  24 #include "chrome/renderer/webview_color_overlay.h"
  25 #include "components/translate/content/renderer/translate_helper.h"
  26 #include "components/web_cache/renderer/web_cache_render_process_observer.h"
  27 #include "content/public/common/bindings_policy.h"
  28 #include "content/public/renderer/content_renderer_client.h"
  29 #include "content/public/renderer/render_frame.h"
  30 #include "content/public/renderer/render_view.h"
  31 #include "extensions/common/constants.h"
  32 #include "extensions/renderer/extension_groups.h"
  33 #include "net/base/data_url.h"
  34 #include "skia/ext/platform_canvas.h"
  35 #include "third_party/WebKit/public/platform/WebCString.h"
  36 #include "third_party/WebKit/public/platform/WebRect.h"
  37 #include "third_party/WebKit/public/platform/WebSize.h"
  38 #include "third_party/WebKit/public/platform/WebString.h"
  39 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  40 #include "third_party/WebKit/public/platform/WebVector.h"
  41 #include "third_party/WebKit/public/web/WebAXObject.h"
  42 #include "third_party/WebKit/public/web/WebDataSource.h"
  43 #include "third_party/WebKit/public/web/WebDocument.h"
  44 #include "third_party/WebKit/public/web/WebElement.h"
  45 #include "third_party/WebKit/public/web/WebInputEvent.h"
  46 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  47 #include "third_party/WebKit/public/web/WebNode.h"
  48 #include "third_party/WebKit/public/web/WebNodeList.h"
  49 #include "third_party/WebKit/public/web/WebView.h"
  50 #include "ui/base/ui_base_switches_util.h"
  51 #include "ui/gfx/favicon_size.h"
  52 #include "ui/gfx/size.h"
  53 #include "ui/gfx/size_f.h"
  54 #include "ui/gfx/skbitmap_operations.h"
  55 #include "v8/include/v8-testing.h"
  56
  57 #if defined(ENABLE_EXTENSIONS)
  58 #include "chrome/common/extensions/chrome_extension_messages.h"
  59 #endif
  60
  61 using blink::WebAXObject;
  62 using blink::WebCString;
  63 using blink::WebDataSource;
  64 using blink::WebDocument;
  65 using blink::WebElement;
  66 using blink::WebFrame;
  67 using blink::WebGestureEvent;
  68 using blink::WebIconURL;
  69 using blink::WebLocalFrame;
  70 using blink::WebNode;
  71 using blink::WebNodeList;
  72 using blink::WebRect;
  73 using blink::WebSecurityOrigin;
  74 using blink::WebSize;
  75 using blink::WebString;
  76 using blink::WebTouchEvent;
  77 using blink::WebURL;
  78 using blink::WebURLRequest;
  79 using blink::WebView;
  80 using blink::WebVector;
  81 using blink::WebWindowFeatures;
  82
  83 // Delay in milliseconds that we'll wait before capturing the page contents
  84 // and thumbnail.
  85 static const int kDelayForCaptureMs = 500;
  86
  87 // Typically, we capture the page data once the page is loaded.
  88 // Sometimes, the page never finishes to load, preventing the page capture
  89 // To workaround this problem, we always perform a capture after the following
  90 // delay.
  91 static const int kDelayForForcedCaptureMs = 6000;
  92
  93 // define to write the time necessary for thumbnail/DOM text retrieval,
  94 // respectively, into the system debug log
  95 // #define TIME_TEXT_RETRIEVAL
  96
  97 // maximum number of characters in the document to index, any text beyond this
  98 // point will be clipped
  99 static const size_t kMaxIndexChars = 65535;
 100
 101 // Constants for UMA statistic collection.
 102 static const char kTranslateCaptureText[] = "Translate.CaptureText";
 103
 104 namespace {
 105
 106 #if defined(OS_ANDROID)
 107 // Parses the DOM for a <meta> tag with a particular name.
 108 // |meta_tag_content| is set to the contents of the 'content' attribute.
 109 // |found_tag| is set to true if the tag was successfully found.
 110 // Returns true if the document was parsed without errors.
 111 bool RetrieveMetaTagContent(const WebFrame* main_frame,
 112                             const GURL& expected_url,
 113                             const std::string& meta_tag_name,
 114                             bool* found_tag,
 115                             std::string* meta_tag_content) {
 116   WebDocument document =
 117       main_frame ? main_frame->document() : WebDocument();
 118   WebElement head = document.isNull() ? WebElement() : document.head();
 119   GURL document_url = document.isNull() ? GURL() : GURL(document.url());
 120
 121   // Search the DOM for the <meta> tag with the given name.
 122   *found_tag = false;
 123   *meta_tag_content = "";
 124   if (!head.isNull()) {
 125     WebNodeList children = head.childNodes();
 126     for (unsigned i = 0; i < children.length(); ++i) {
 127       WebNode child = children.item(i);
 128       if (!child.isElementNode())
 129         continue;
 130       WebElement elem = child.to<WebElement>();
 131       if (elem.hasHTMLTagName("meta")) {
 132         if (elem.hasAttribute("name") && elem.hasAttribute("content")) {
 133           std::string name = elem.getAttribute("name").utf8();
 134           if (name == meta_tag_name) {
 135             *meta_tag_content = elem.getAttribute("content").utf8();
 136             *found_tag = true;
 137             break;
 138           }
 139         }
 140       }
 141     }
 142   }
 143
 144   // Make sure we're checking the right page and that the length of the content
 145   // string is reasonable.
 146   bool success = document_url == expected_url;
 147   if (meta_tag_content->size() > chrome::kMaxMetaTagAttributeLength) {
 148     *meta_tag_content = "";
 149     success = false;
 150   }
 151
 152   return success;
 153 }
 154 #endif
 155
 156 }  // namespace
 157
 158 ChromeRenderViewObserver::ChromeRenderViewObserver(
 159     content::RenderView* render_view,
 160     web_cache::WebCacheRenderProcessObserver* web_cache_render_process_observer)
 161     : content::RenderViewObserver(render_view),
 162       web_cache_render_process_observer_(web_cache_render_process_observer),
 163       translate_helper_(new translate::TranslateHelper(
 164           render_view,
 165           chrome::ISOLATED_WORLD_ID_TRANSLATE,
 166           extensions::EXTENSION_GROUP_INTERNAL_TRANSLATE_SCRIPTS,
 167           extensions::kExtensionScheme)),
 168       phishing_classifier_(NULL),
 169       capture_timer_(false, false) {
 170   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 171   if (!command_line.HasSwitch(switches::kDisableClientSidePhishingDetection))
 172     OnSetClientSidePhishingDetection(true);
 173 }
 174
 175 ChromeRenderViewObserver::~ChromeRenderViewObserver() {
 176 }
 177
 178 bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
 179   bool handled = true;
 180   IPC_BEGIN_MESSAGE_MAP(ChromeRenderViewObserver, message)
 181 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 182     IPC_MESSAGE_HANDLER(ChromeViewMsg_WebUIJavaScript, OnWebUIJavaScript)
 183 #endif
 184 #if defined(ENABLE_EXTENSIONS)
 185     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetVisuallyDeemphasized,
 186                         OnSetVisuallyDeemphasized)
 187 #endif
 188 #if defined(OS_ANDROID)
 189     IPC_MESSAGE_HANDLER(ChromeViewMsg_UpdateTopControlsState,
 190                         OnUpdateTopControlsState)
 191     IPC_MESSAGE_HANDLER(ChromeViewMsg_RetrieveMetaTagContent,
 192                         OnRetrieveMetaTagContent)
 193 #endif
 194     IPC_MESSAGE_HANDLER(ChromeViewMsg_GetWebApplicationInfo,
 195                         OnGetWebApplicationInfo)
 196     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetClientSidePhishingDetection,
 197                         OnSetClientSidePhishingDetection)
 198     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetWindowFeatures, OnSetWindowFeatures)
 199     IPC_MESSAGE_UNHANDLED(handled = false)
 200   IPC_END_MESSAGE_MAP()
 201
 202   return handled;
 203 }
 204
 205 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 206 void ChromeRenderViewObserver::OnWebUIJavaScript(
 207     const base::string16& javascript) {
 208   webui_javascript_.push_back(javascript);
 209 }
 210 #endif
 211
 212 #if defined(OS_ANDROID)
 213 void ChromeRenderViewObserver::OnUpdateTopControlsState(
 214     content::TopControlsState constraints,
 215     content::TopControlsState current,
 216     bool animate) {
 217   render_view()->UpdateTopControlsState(constraints, current, animate);
 218 }
 219
 220 void ChromeRenderViewObserver::OnRetrieveMetaTagContent(
 221     const GURL& expected_url,
 222     const std::string tag_name) {
 223   bool found_tag;
 224   std::string content_str;
 225   bool parsed_successfully = RetrieveMetaTagContent(
 226       render_view()->GetWebView()->mainFrame(),
 227       expected_url,
 228       tag_name,
 229       &found_tag,
 230       &content_str);
 231
 232   Send(new ChromeViewHostMsg_DidRetrieveMetaTagContent(
 233       routing_id(),
 234       parsed_successfully && found_tag,
 235       tag_name,
 236       content_str,
 237       expected_url));
 238 }
 239 #endif
 240
 241 void ChromeRenderViewObserver::OnGetWebApplicationInfo() {
 242   WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
 243   DCHECK(main_frame);
 244
 245   WebApplicationInfo web_app_info;
 246   web_apps::ParseWebAppFromWebDocument(main_frame, &web_app_info);
 247
 248   // The warning below is specific to mobile but it doesn't hurt to show it even
 249   // if the Chromium build is running on a desktop. It will get more exposition.
 250   if (web_app_info.mobile_capable ==
 251         WebApplicationInfo::MOBILE_CAPABLE_APPLE) {
 252     blink::WebConsoleMessage message(
 253         blink::WebConsoleMessage::LevelWarning,
 254         "<meta name=\"apple-mobile-web-app-capable\" content=\"yes\"> is "
 255         "deprecated. Please include <meta name=\"mobile-web-app-capable\" "
 256         "content=\"yes\"> - "
 257         "http://developers.google.com/chrome/mobile/docs/installtohomescreen");
 258     main_frame->addMessageToConsole(message);
 259   }
 260
 261   // Prune out any data URLs in the set of icons.  The browser process expects
 262   // any icon with a data URL to have originated from a favicon.  We don't want
 263   // to decode arbitrary data URLs in the browser process.  See
 264   // http://b/issue?id=1162972
 265   for (std::vector<WebApplicationInfo::IconInfo>::iterator it =
 266           web_app_info.icons.begin(); it != web_app_info.icons.end();) {
 267     if (it->url.SchemeIs(url::kDataScheme))
 268       it = web_app_info.icons.erase(it);
 269     else
 270       ++it;
 271   }
 272
 273   // Truncate the strings we send to the browser process.
 274   web_app_info.title =
 275       web_app_info.title.substr(0, chrome::kMaxMetaTagAttributeLength);
 276   web_app_info.description =
 277       web_app_info.description.substr(0, chrome::kMaxMetaTagAttributeLength);
 278
 279   Send(new ChromeViewHostMsg_DidGetWebApplicationInfo(
 280       routing_id(), web_app_info));
 281 }
 282
 283 void ChromeRenderViewObserver::OnSetWindowFeatures(
 284     const WebWindowFeatures& window_features) {
 285   render_view()->GetWebView()->setWindowFeatures(window_features);
 286 }
 287
 288 void ChromeRenderViewObserver::Navigate(const GURL& url) {
 289   // Execute cache clear operations that were postponed until a navigation
 290   // event (including tab reload).
 291   if (web_cache_render_process_observer_)
 292     web_cache_render_process_observer_->ExecutePendingClearCache();
 293   // Let translate_helper do any preparatory work for loading a URL.
 294   if (translate_helper_)
 295     translate_helper_->PrepareForUrl(url);
 296 }
 297
 298 void ChromeRenderViewObserver::OnSetClientSidePhishingDetection(
 299     bool enable_phishing_detection) {
 300 #if defined(FULL_SAFE_BROWSING) && !defined(OS_CHROMEOS)
 301   phishing_classifier_ = enable_phishing_detection ?
 302       safe_browsing::PhishingClassifierDelegate::Create(render_view(), NULL) :
 303       NULL;
 304 #endif
 305 }
 306
 307 #if defined(ENABLE_EXTENSIONS)
 308 void ChromeRenderViewObserver::OnSetVisuallyDeemphasized(bool deemphasized) {
 309   bool already_deemphasized = !!dimmed_color_overlay_.get();
 310   if (already_deemphasized == deemphasized)
 311     return;
 312
 313   if (deemphasized) {
 314     // 70% opaque grey.
 315     SkColor greyish = SkColorSetARGB(178, 0, 0, 0);
 316     dimmed_color_overlay_.reset(
 317         new WebViewColorOverlay(render_view(), greyish));
 318   } else {
 319     dimmed_color_overlay_.reset();
 320   }
 321 }
 322 #endif
 323
 324 void ChromeRenderViewObserver::DidStartLoading() {
 325   if ((render_view()->GetEnabledBindings() & content::BINDINGS_POLICY_WEB_UI) &&
 326       !webui_javascript_.empty()) {
 327     for (size_t i = 0; i < webui_javascript_.size(); ++i) {
 328       render_view()->GetMainRenderFrame()->ExecuteJavaScript(
 329           webui_javascript_[i]);
 330     }
 331     webui_javascript_.clear();
 332   }
 333 }
 334
 335 void ChromeRenderViewObserver::DidStopLoading() {
 336   WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
 337   GURL osdd_url = main_frame->document().openSearchDescriptionURL();
 338   if (!osdd_url.is_empty()) {
 339     Send(new ChromeViewHostMsg_PageHasOSDD(
 340         routing_id(), main_frame->document().url(), osdd_url,
 341         search_provider::AUTODETECTED_PROVIDER));
 342   }
 343
 344   // Don't capture pages including refresh meta tag.
 345   if (HasRefreshMetaTag(main_frame))
 346     return;
 347
 348   CapturePageInfoLater(
 349       false,  // preliminary_capture
 350       base::TimeDelta::FromMilliseconds(
 351           render_view()->GetContentStateImmediately() ?
 352               0 : kDelayForCaptureMs));
 353 }
 354
 355 void ChromeRenderViewObserver::DidCommitProvisionalLoad(
 356     WebLocalFrame* frame, bool is_new_navigation) {
 357   // Don't capture pages being not new, or including refresh meta tag.
 358   if (!is_new_navigation || HasRefreshMetaTag(frame))
 359     return;
 360
 361   CapturePageInfoLater(
 362       true,  // preliminary_capture
 363       base::TimeDelta::FromMilliseconds(kDelayForForcedCaptureMs));
 364 }
 365
 366 void ChromeRenderViewObserver::CapturePageInfoLater(bool preliminary_capture,
 367                                                     base::TimeDelta delay) {
 368   capture_timer_.Start(
 369       FROM_HERE,
 370       delay,
 371       base::Bind(&ChromeRenderViewObserver::CapturePageInfo,
 372                  base::Unretained(this),
 373                  preliminary_capture));
 374 }
 375
 376 void ChromeRenderViewObserver::CapturePageInfo(bool preliminary_capture) {
 377   if (!render_view()->GetWebView())
 378     return;
 379
 380   WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
 381   if (!main_frame)
 382     return;
 383
 384   // Don't index/capture pages that are in view source mode.
 385   if (main_frame->isViewSourceModeEnabled())
 386     return;
 387
 388   // Don't index/capture pages that failed to load.  This only checks the top
 389   // level frame so the thumbnail may contain a frame that failed to load.
 390   WebDataSource* ds = main_frame->dataSource();
 391   if (ds && ds->hasUnreachableURL())
 392     return;
 393
 394   // Don't index/capture pages that are being prerendered.
 395   if (prerender::PrerenderHelper::IsPrerendering(
 396           render_view()->GetMainRenderFrame())) {
 397     return;
 398   }
 399
 400   // Retrieve the frame's full text (up to kMaxIndexChars), and pass it to the
 401   // translate helper for language detection and possible translation.
 402   base::string16 contents;
 403   base::TimeTicks capture_begin_time = base::TimeTicks::Now();
 404   CaptureText(main_frame, &contents);
 405   UMA_HISTOGRAM_TIMES(kTranslateCaptureText,
 406                       base::TimeTicks::Now() - capture_begin_time);
 407   if (translate_helper_)
 408     translate_helper_->PageCaptured(contents);
 409
 410   TRACE_EVENT0("renderer", "ChromeRenderViewObserver::CapturePageInfo");
 411
 412 #if defined(FULL_SAFE_BROWSING)
 413   // Will swap out the string.
 414   if (phishing_classifier_)
 415     phishing_classifier_->PageCaptured(&contents, preliminary_capture);
 416 #endif
 417 }
 418
 419 void ChromeRenderViewObserver::CaptureText(WebFrame* frame,
 420                                            base::string16* contents) {
 421   contents->clear();
 422   if (!frame)
 423     return;
 424
 425 #ifdef TIME_TEXT_RETRIEVAL
 426   double begin = time_util::GetHighResolutionTimeNow();
 427 #endif
 428
 429   // get the contents of the frame
 430   *contents = frame->contentAsText(kMaxIndexChars);
 431
 432 #ifdef TIME_TEXT_RETRIEVAL
 433   double end = time_util::GetHighResolutionTimeNow();
 434   char buf[128];
 435   sprintf_s(buf, "%d chars retrieved for indexing in %gms\n",
 436             contents.size(), (end - begin)*1000);
 437   OutputDebugStringA(buf);
 438 #endif
 439
 440   // When the contents are clipped to the maximum, we don't want to have a
 441   // partial word indexed at the end that might have been clipped. Therefore,
 442   // terminate the string at the last space to ensure no words are clipped.
 443   if (contents->size() == kMaxIndexChars) {
 444     size_t last_space_index = contents->find_last_of(base::kWhitespaceUTF16);
 445     if (last_space_index != base::string16::npos)
 446       contents->resize(last_space_index);
 447   }
 448 }
 449
 450 bool ChromeRenderViewObserver::HasRefreshMetaTag(WebFrame* frame) {
 451   if (!frame)
 452     return false;
 453   WebElement head = frame->document().head();
 454   if (head.isNull() || !head.hasChildNodes())
 455     return false;
 456
 457   const WebString tag_name(base::ASCIIToUTF16("meta"));
 458   const WebString attribute_name(base::ASCIIToUTF16("http-equiv"));
 459
 460   WebNodeList children = head.childNodes();
 461   for (size_t i = 0; i < children.length(); ++i) {
 462     WebNode node = children.item(i);
 463     if (!node.isElementNode())
 464       continue;
 465     WebElement element = node.to<WebElement>();
 466     if (!element.hasHTMLTagName(tag_name))
 467       continue;
 468     WebString value = element.getAttribute(attribute_name);
 469     if (value.isNull() || !LowerCaseEqualsASCII(value, "refresh"))
 470       continue;
 471     return true;
 472   }
 473   return false;
 474 }