android_webview/renderer/aw_render_view_ext.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 "android_webview/renderer/aw_render_view_ext.h"
   6
   7 #include <string>
   8
   9 #include "android_webview/common/aw_hit_test_data.h"
  10 #include "android_webview/common/render_view_messages.h"
  11 #include "base/bind.h"
  12 #include "base/strings/string_piece.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "base/time/time.h"
  15 #include "content/public/renderer/android_content_detection_prefixes.h"
  16 #include "content/public/renderer/document_state.h"
  17 #include "content/public/renderer/render_view.h"
  18 #include "skia/ext/refptr.h"
  19 #include "third_party/WebKit/public/platform/WebSize.h"
  20 #include "third_party/WebKit/public/platform/WebURL.h"
  21 #include "third_party/WebKit/public/platform/WebVector.h"
  22 #include "third_party/WebKit/public/web/WebDataSource.h"
  23 #include "third_party/WebKit/public/web/WebDocument.h"
  24 #include "third_party/WebKit/public/web/WebElement.h"
  25 #include "third_party/WebKit/public/web/WebElementCollection.h"
  26 #include "third_party/WebKit/public/web/WebHitTestResult.h"
  27 #include "third_party/WebKit/public/web/WebImageCache.h"
  28 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  29 #include "third_party/WebKit/public/web/WebNode.h"
  30 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
  31 #include "third_party/WebKit/public/web/WebView.h"
  32 #include "url/url_canon.h"
  33 #include "url/url_constants.h"
  34 #include "url/url_util.h"
  35
  36 namespace android_webview {
  37
  38 namespace {
  39
  40 GURL GetAbsoluteUrl(const blink::WebNode& node,
  41                     const base::string16& url_fragment) {
  42   return GURL(node.document().completeURL(url_fragment));
  43 }
  44
  45 base::string16 GetHref(const blink::WebElement& element) {
  46   // Get the actual 'href' attribute, which might relative if valid or can
  47   // possibly contain garbage otherwise, so not using absoluteLinkURL here.
  48   return element.getAttribute("href");
  49 }
  50
  51 GURL GetAbsoluteSrcUrl(const blink::WebElement& element) {
  52   if (element.isNull())
  53     return GURL();
  54   return GetAbsoluteUrl(element, element.getAttribute("src"));
  55 }
  56
  57 blink::WebElement GetImgChild(const blink::WebNode& node) {
  58   // This implementation is incomplete (for example if is an area tag) but
  59   // matches the original WebViewClassic implementation.
  60
  61   blink::WebElementCollection collection = node.getElementsByHTMLTagName("img");
  62   DCHECK(!collection.isNull());
  63   return collection.firstItem();
  64 }
  65
  66 GURL GetChildImageUrlFromElement(const blink::WebElement& element) {
  67   const blink::WebElement child_img = GetImgChild(element);
  68   if (child_img.isNull())
  69     return GURL();
  70   return GetAbsoluteSrcUrl(child_img);
  71 }
  72
  73 bool RemovePrefixAndAssignIfMatches(const base::StringPiece& prefix,
  74                                     const GURL& url,
  75                                     std::string* dest) {
  76   const base::StringPiece spec(url.possibly_invalid_spec());
  77
  78   if (spec.starts_with(prefix)) {
  79     url::RawCanonOutputW<1024> output;
  80     url::DecodeURLEscapeSequences(spec.data() + prefix.length(),
  81                                   spec.length() - prefix.length(),
  82                                   &output);
  83     std::string decoded_url = base::UTF16ToUTF8(
  84         base::string16(output.data(), output.length()));
  85     dest->assign(decoded_url.begin(), decoded_url.end());
  86     return true;
  87   }
  88   return false;
  89 }
  90
  91 void DistinguishAndAssignSrcLinkType(const GURL& url, AwHitTestData* data) {
  92   if (RemovePrefixAndAssignIfMatches(
  93       content::kAddressPrefix,
  94       url,
  95       &data->extra_data_for_type)) {
  96     data->type = AwHitTestData::GEO_TYPE;
  97   } else if (RemovePrefixAndAssignIfMatches(
  98       content::kPhoneNumberPrefix,
  99       url,
 100       &data->extra_data_for_type)) {
 101     data->type = AwHitTestData::PHONE_TYPE;
 102   } else if (RemovePrefixAndAssignIfMatches(
 103       content::kEmailPrefix,
 104       url,
 105       &data->extra_data_for_type)) {
 106     data->type = AwHitTestData::EMAIL_TYPE;
 107   } else {
 108     data->type = AwHitTestData::SRC_LINK_TYPE;
 109     data->extra_data_for_type = url.possibly_invalid_spec();
 110     if (!data->extra_data_for_type.empty())
 111       data->href = base::UTF8ToUTF16(data->extra_data_for_type);
 112   }
 113 }
 114
 115 void PopulateHitTestData(const GURL& absolute_link_url,
 116                          const GURL& absolute_image_url,
 117                          bool is_editable,
 118                          AwHitTestData* data) {
 119   // Note: Using GURL::is_empty instead of GURL:is_valid due to the
 120   // WebViewClassic allowing any kind of protocol which GURL::is_valid
 121   // disallows. Similar reasons for using GURL::possibly_invalid_spec instead of
 122   // GURL::spec.
 123   if (!absolute_image_url.is_empty())
 124     data->img_src = absolute_image_url;
 125
 126   const bool is_javascript_scheme =
 127       absolute_link_url.SchemeIs(url::kJavaScriptScheme);
 128   const bool has_link_url = !absolute_link_url.is_empty();
 129   const bool has_image_url = !absolute_image_url.is_empty();
 130
 131   if (has_link_url && !has_image_url && !is_javascript_scheme) {
 132     DistinguishAndAssignSrcLinkType(absolute_link_url, data);
 133   } else if (has_link_url && has_image_url && !is_javascript_scheme) {
 134     data->type = AwHitTestData::SRC_IMAGE_LINK_TYPE;
 135     data->extra_data_for_type = data->img_src.possibly_invalid_spec();
 136     if (absolute_link_url.is_valid())
 137       data->href = base::UTF8ToUTF16(absolute_link_url.possibly_invalid_spec());
 138   } else if (!has_link_url && has_image_url) {
 139     data->type = AwHitTestData::IMAGE_TYPE;
 140     data->extra_data_for_type = data->img_src.possibly_invalid_spec();
 141   } else if (is_editable) {
 142     data->type = AwHitTestData::EDIT_TEXT_TYPE;
 143     DCHECK_EQ(0u, data->extra_data_for_type.length());
 144   }
 145 }
 146
 147 }  // namespace
 148
 149 AwRenderViewExt::AwRenderViewExt(content::RenderView* render_view)
 150     : content::RenderViewObserver(render_view), page_scale_factor_(0.0f) {
 151 }
 152
 153 AwRenderViewExt::~AwRenderViewExt() {
 154 }
 155
 156 // static
 157 void AwRenderViewExt::RenderViewCreated(content::RenderView* render_view) {
 158   new AwRenderViewExt(render_view);  // |render_view| takes ownership.
 159 }
 160
 161 bool AwRenderViewExt::OnMessageReceived(const IPC::Message& message) {
 162   bool handled = true;
 163   IPC_BEGIN_MESSAGE_MAP(AwRenderViewExt, message)
 164     IPC_MESSAGE_HANDLER(AwViewMsg_DocumentHasImages, OnDocumentHasImagesRequest)
 165     IPC_MESSAGE_HANDLER(AwViewMsg_DoHitTest, OnDoHitTest)
 166     IPC_MESSAGE_HANDLER(AwViewMsg_SetTextZoomFactor, OnSetTextZoomFactor)
 167     IPC_MESSAGE_HANDLER(AwViewMsg_ResetScrollAndScaleState,
 168                         OnResetScrollAndScaleState)
 169     IPC_MESSAGE_HANDLER(AwViewMsg_SetInitialPageScale, OnSetInitialPageScale)
 170     IPC_MESSAGE_HANDLER(AwViewMsg_SetBackgroundColor, OnSetBackgroundColor)
 171     IPC_MESSAGE_UNHANDLED(handled = false)
 172   IPC_END_MESSAGE_MAP()
 173   return handled;
 174 }
 175
 176 void AwRenderViewExt::OnDocumentHasImagesRequest(int id) {
 177   bool hasImages = false;
 178   if (render_view()) {
 179     blink::WebView* webview = render_view()->GetWebView();
 180     if (webview) {
 181       blink::WebDocument document = webview->mainFrame()->document();
 182       const blink::WebElement child_img = GetImgChild(document);
 183       hasImages = !child_img.isNull();
 184     }
 185   }
 186   Send(new AwViewHostMsg_DocumentHasImagesResponse(routing_id(), id,
 187                                                    hasImages));
 188 }
 189
 190 void AwRenderViewExt::DidCommitCompositorFrame() {
 191   UpdatePageScaleFactor();
 192 }
 193
 194 void AwRenderViewExt::DidUpdateLayout() {
 195   if (check_contents_size_timer_.IsRunning())
 196     return;
 197
 198   check_contents_size_timer_.Start(FROM_HERE,
 199                                    base::TimeDelta::FromMilliseconds(0), this,
 200                                    &AwRenderViewExt::CheckContentsSize);
 201 }
 202
 203 void AwRenderViewExt::UpdatePageScaleFactor() {
 204   if (page_scale_factor_ != render_view()->GetWebView()->pageScaleFactor()) {
 205     page_scale_factor_ = render_view()->GetWebView()->pageScaleFactor();
 206     Send(new AwViewHostMsg_PageScaleFactorChanged(routing_id(),
 207                                                   page_scale_factor_));
 208   }
 209 }
 210
 211 void AwRenderViewExt::CheckContentsSize() {
 212   if (!render_view()->GetWebView())
 213     return;
 214
 215   gfx::Size contents_size;
 216
 217   blink::WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
 218   if (main_frame)
 219     contents_size = main_frame->contentsSize();
 220
 221   // Fall back to contentsPreferredMinimumSize if the mainFrame is reporting a
 222   // 0x0 size (this happens during initial load).
 223   if (contents_size.IsEmpty()) {
 224     contents_size = render_view()->GetWebView()->contentsPreferredMinimumSize();
 225   }
 226
 227   if (contents_size == last_sent_contents_size_)
 228     return;
 229
 230   last_sent_contents_size_ = contents_size;
 231   Send(new AwViewHostMsg_OnContentsSizeChanged(routing_id(), contents_size));
 232 }
 233
 234 void AwRenderViewExt::Navigate(const GURL& url) {
 235   // Navigate is called only on NEW navigations, so WebImageCache won't be freed
 236   // when the user just clicks on links, but only when a navigation is started,
 237   // for instance via loadUrl. A better approach would be clearing the cache on
 238   // cross-site boundaries, however this would require too many changes both on
 239   // the browser side (in RenderViewHostManger), to the IPCmessages and to the
 240   // RenderViewObserver. Thus, clearing decoding image cache on Navigate, seems
 241   // a more acceptable compromise.
 242   blink::WebImageCache::clear();
 243 }
 244
 245 void AwRenderViewExt::FocusedNodeChanged(const blink::WebNode& node) {
 246   if (node.isNull() || !node.isElementNode() || !render_view())
 247     return;
 248
 249   // Note: element is not const due to textContent() is not const.
 250   blink::WebElement element = node.toConst<blink::WebElement>();
 251   AwHitTestData data;
 252
 253   data.href = GetHref(element);
 254   data.anchor_text = element.textContent();
 255
 256   GURL absolute_link_url;
 257   if (node.isLink())
 258     absolute_link_url = GetAbsoluteUrl(node, data.href);
 259
 260   GURL absolute_image_url = GetChildImageUrlFromElement(element);
 261
 262   PopulateHitTestData(absolute_link_url,
 263                       absolute_image_url,
 264                       render_view()->IsEditableNode(node),
 265                       &data);
 266   Send(new AwViewHostMsg_UpdateHitTestData(routing_id(), data));
 267 }
 268
 269 void AwRenderViewExt::OnDoHitTest(const gfx::PointF& touch_center,
 270                                   const gfx::SizeF& touch_area) {
 271   if (!render_view() || !render_view()->GetWebView())
 272     return;
 273
 274   const blink::WebHitTestResult result =
 275       render_view()->GetWebView()->hitTestResultForTap(
 276           blink::WebPoint(touch_center.x(), touch_center.y()),
 277           blink::WebSize(touch_area.width(), touch_area.height()));
 278   AwHitTestData data;
 279
 280   GURL absolute_image_url = result.absoluteImageURL();
 281   if (!result.urlElement().isNull()) {
 282     data.anchor_text = result.urlElement().textContent();
 283     data.href = GetHref(result.urlElement());
 284     // If we hit an image that failed to load, Blink won't give us its URL.
 285     // Fall back to walking the DOM in this case.
 286     if (absolute_image_url.is_empty())
 287       absolute_image_url = GetChildImageUrlFromElement(result.urlElement());
 288   }
 289
 290   PopulateHitTestData(result.absoluteLinkURL(),
 291                       absolute_image_url,
 292                       result.isContentEditable(),
 293                       &data);
 294   Send(new AwViewHostMsg_UpdateHitTestData(routing_id(), data));
 295 }
 296
 297 void AwRenderViewExt::OnSetTextZoomFactor(float zoom_factor) {
 298   if (!render_view() || !render_view()->GetWebView())
 299     return;
 300   // Hide selection and autofill popups.
 301   render_view()->GetWebView()->hidePopups();
 302   render_view()->GetWebView()->setTextZoomFactor(zoom_factor);
 303 }
 304
 305 void AwRenderViewExt::OnResetScrollAndScaleState() {
 306   if (!render_view() || !render_view()->GetWebView())
 307     return;
 308   render_view()->GetWebView()->resetScrollAndScaleState();
 309 }
 310
 311 void AwRenderViewExt::OnSetInitialPageScale(double page_scale_factor) {
 312   if (!render_view() || !render_view()->GetWebView())
 313     return;
 314   render_view()->GetWebView()->setInitialPageScaleOverride(
 315       page_scale_factor);
 316 }
 317
 318 void AwRenderViewExt::OnSetBackgroundColor(SkColor c) {
 319   if (!render_view() || !render_view()->GetWebView())
 320     return;
 321   render_view()->GetWebView()->setBaseBackgroundColor(c);
 322 }
 323
 324 }  // namespace android_webview