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