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 "content/browser/accessibility/accessibility_ui.h"
6
7#include "base/bind.h"
8#include "base/bind_helpers.h"
9#include "base/json/json_writer.h"
10#include "base/strings/string_number_conversions.h"
11#include "base/strings/utf_string_conversions.h"
12#include "base/values.h"
13#include "content/browser/accessibility/accessibility_tree_formatter.h"
14#include "content/browser/accessibility/browser_accessibility_manager.h"
15#include "content/browser/accessibility/browser_accessibility_state_impl.h"
16#include "content/browser/renderer_host/render_widget_host_impl.h"
17#include "content/browser/renderer_host/render_widget_host_view_base.h"
18#include "content/browser/web_contents/web_contents_impl.h"
19#include "content/common/view_message_enums.h"
20#include "content/grit/content_resources.h"
21#include "content/public/browser/favicon_status.h"
22#include "content/public/browser/navigation_entry.h"
23#include "content/public/browser/render_process_host.h"
24#include "content/public/browser/render_view_host.h"
25#include "content/public/browser/render_widget_host.h"
26#include "content/public/browser/render_widget_host_iterator.h"
27#include "content/public/browser/web_contents.h"
28#include "content/public/browser/web_ui_data_source.h"
29#include "content/public/common/url_constants.h"
30#include "net/base/escape.h"
31
32static const char kDataFile[] = "targets-data.json";
33
34static const char kProcessIdField[]  = "processId";
35static const char kRouteIdField[]  = "routeId";
36static const char kUrlField[]  = "url";
37static const char kNameField[]  = "name";
38static const char kFaviconUrlField[] = "favicon_url";
39static const char kPidField[]  = "pid";
40static const char kAccessibilityModeField[] = "a11y_mode";
41
42namespace content {
43
44namespace {
45
46base::DictionaryValue* BuildTargetDescriptor(
47    const GURL& url,
48    const std::string& name,
49    const GURL& favicon_url,
50    int process_id,
51    int route_id,
52    AccessibilityMode accessibility_mode,
53    base::ProcessHandle handle = base::kNullProcessHandle) {
54  base::DictionaryValue* target_data = new base::DictionaryValue();
55  target_data->SetInteger(kProcessIdField, process_id);
56  target_data->SetInteger(kRouteIdField, route_id);
57  target_data->SetString(kUrlField, url.spec());
58  target_data->SetString(kNameField, net::EscapeForHTML(name));
59  target_data->SetInteger(kPidField, base::GetProcId(handle));
60  target_data->SetString(kFaviconUrlField, favicon_url.spec());
61  target_data->SetInteger(kAccessibilityModeField,
62                          accessibility_mode);
63  return target_data;
64}
65
66base::DictionaryValue* BuildTargetDescriptor(RenderViewHost* rvh) {
67  WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
68      WebContents::FromRenderViewHost(rvh));
69  AccessibilityMode accessibility_mode = web_contents->GetAccessibilityMode();
70
71  std::string title;
72  GURL url;
73  GURL favicon_url;
74  if (web_contents) {
75    // TODO(nasko): Fix the following code to use a consistent set of data
76    // across the URL, title, and favicon.
77    url = web_contents->GetURL();
78    title = base::UTF16ToUTF8(web_contents->GetTitle());
79    NavigationController& controller = web_contents->GetController();
80    NavigationEntry* entry = controller.GetVisibleEntry();
81    if (entry != NULL && entry->GetURL().is_valid())
82      favicon_url = entry->GetFavicon().url;
83  }
84
85  return BuildTargetDescriptor(url,
86                               title,
87                               favicon_url,
88                               rvh->GetProcess()->GetID(),
89                               rvh->GetRoutingID(),
90                               accessibility_mode);
91}
92
93bool HandleRequestCallback(BrowserContext* current_context,
94                           const std::string& path,
95                           const WebUIDataSource::GotDataCallback& callback) {
96  if (path != kDataFile)
97    return false;
98  scoped_ptr<base::ListValue> rvh_list(new base::ListValue());
99
100  scoped_ptr<RenderWidgetHostIterator> widgets(
101      RenderWidgetHost::GetRenderWidgetHosts());
102
103  while (RenderWidgetHost* widget = widgets->GetNextHost()) {
104    // Ignore processes that don't have a connection, such as crashed tabs.
105    if (!widget->GetProcess()->HasConnection())
106      continue;
107    if (!widget->IsRenderView())
108        continue;
109    RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
110    BrowserContext* context = rwhi->GetProcess()->GetBrowserContext();
111    if (context != current_context)
112      continue;
113
114    RenderViewHost* rvh = RenderViewHost::From(widget);
115    rvh_list->Append(BuildTargetDescriptor(rvh));
116  }
117
118  scoped_ptr<base::DictionaryValue> data(new base::DictionaryValue());
119  data->Set("list", rvh_list.release());
120  data->SetInteger(
121      "global_a11y_mode",
122      BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode());
123
124  std::string json_string;
125  base::JSONWriter::Write(data.get(), &json_string);
126
127  callback.Run(base::RefCountedString::TakeString(&json_string));
128  return true;
129}
130
131}  // namespace
132
133AccessibilityUI::AccessibilityUI(WebUI* web_ui) : WebUIController(web_ui) {
134  // Set up the chrome://accessibility source.
135  WebUIDataSource* html_source =
136      WebUIDataSource::Create(kChromeUIAccessibilityHost);
137  html_source->SetUseJsonJSFormatV2();
138
139  web_ui->RegisterMessageCallback(
140      "toggleAccessibility",
141      base::Bind(&AccessibilityUI::ToggleAccessibility,
142                 base::Unretained(this)));
143  web_ui->RegisterMessageCallback(
144      "toggleGlobalAccessibility",
145      base::Bind(&AccessibilityUI::ToggleGlobalAccessibility,
146                 base::Unretained(this)));
147  web_ui->RegisterMessageCallback(
148      "requestAccessibilityTree",
149      base::Bind(&AccessibilityUI::RequestAccessibilityTree,
150                 base::Unretained(this)));
151
152  // Add required resources.
153  html_source->SetJsonPath("strings.js");
154  html_source->AddResourcePath("accessibility.css", IDR_ACCESSIBILITY_CSS);
155  html_source->AddResourcePath("accessibility.js", IDR_ACCESSIBILITY_JS);
156  html_source->SetDefaultResource(IDR_ACCESSIBILITY_HTML);
157  html_source->SetRequestFilter(
158      base::Bind(&HandleRequestCallback,
159                 web_ui->GetWebContents()->GetBrowserContext()));
160
161  BrowserContext* browser_context =
162      web_ui->GetWebContents()->GetBrowserContext();
163  WebUIDataSource::Add(browser_context, html_source);
164}
165
166AccessibilityUI::~AccessibilityUI() {}
167
168void AccessibilityUI::ToggleAccessibility(const base::ListValue* args) {
169  std::string process_id_str;
170  std::string route_id_str;
171  int process_id;
172  int route_id;
173  CHECK_EQ(2U, args->GetSize());
174  CHECK(args->GetString(0, &process_id_str));
175  CHECK(args->GetString(1, &route_id_str));
176  CHECK(base::StringToInt(process_id_str, &process_id));
177  CHECK(base::StringToInt(route_id_str, &route_id));
178
179  RenderViewHost* rvh = RenderViewHost::FromID(process_id, route_id);
180  if (!rvh)
181    return;
182  WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
183      WebContents::FromRenderViewHost(rvh));
184  AccessibilityMode mode = web_contents->GetAccessibilityMode();
185  if ((mode & AccessibilityModeComplete) != AccessibilityModeComplete) {
186    web_contents->AddAccessibilityMode(AccessibilityModeComplete);
187  } else {
188    web_contents->SetAccessibilityMode(
189        BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode());
190  }
191}
192
193void AccessibilityUI::ToggleGlobalAccessibility(const base::ListValue* args) {
194  BrowserAccessibilityStateImpl* state =
195      BrowserAccessibilityStateImpl::GetInstance();
196  AccessibilityMode mode = state->accessibility_mode();
197  if ((mode & AccessibilityModeComplete) != AccessibilityModeComplete)
198    state->EnableAccessibility();
199  else
200    state->DisableAccessibility();
201}
202
203void AccessibilityUI::RequestAccessibilityTree(const base::ListValue* args) {
204  std::string process_id_str;
205  std::string route_id_str;
206  int process_id;
207  int route_id;
208  CHECK_EQ(2U, args->GetSize());
209  CHECK(args->GetString(0, &process_id_str));
210  CHECK(args->GetString(1, &route_id_str));
211  CHECK(base::StringToInt(process_id_str, &process_id));
212  CHECK(base::StringToInt(route_id_str, &route_id));
213
214  RenderViewHost* rvh = RenderViewHost::FromID(process_id, route_id);
215  if (!rvh) {
216    scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue());
217    result->SetInteger(kProcessIdField, process_id);
218    result->SetInteger(kRouteIdField, route_id);
219    result->Set("error", new base::StringValue("Renderer no longer exists."));
220    web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
221    return;
222  }
223
224  scoped_ptr<base::DictionaryValue> result(BuildTargetDescriptor(rvh));
225  WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
226  scoped_ptr<AccessibilityTreeFormatter> formatter(
227      AccessibilityTreeFormatter::Create(web_contents));
228  base::string16 accessibility_contents_utf16;
229  std::vector<AccessibilityTreeFormatter::Filter> filters;
230  filters.push_back(AccessibilityTreeFormatter::Filter(
231      base::ASCIIToUTF16("*"),
232      AccessibilityTreeFormatter::Filter::ALLOW));
233  formatter->SetFilters(filters);
234  formatter->FormatAccessibilityTree(&accessibility_contents_utf16);
235
236  result->Set("tree",
237              new base::StringValue(
238                  base::UTF16ToUTF8(accessibility_contents_utf16)));
239  web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
240}
241
242}  // namespace content
243