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