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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/accessibility/accessibility_ui.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/json/json_writer.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "content/browser/accessibility/accessibility_tree_formatter.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/common/view_message_enums.h"
#include "content/grit/content_resources.h"
#include "content/public/browser/favicon_status.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_ui_data_source.h"
#include "content/public/common/url_constants.h"
#include "net/base/escape.h"
static const char kDataFile[] = "targets-data.json";
static const char kProcessIdField[] = "processId";
static const char kRouteIdField[] = "routeId";
static const char kUrlField[] = "url";
static const char kNameField[] = "name";
static const char kFaviconUrlField[] = "favicon_url";
static const char kPidField[] = "pid";
static const char kAccessibilityModeField[] = "a11y_mode";
namespace content {
namespace {
base::DictionaryValue* BuildTargetDescriptor(
const GURL& url,
const std::string& name,
const GURL& favicon_url,
int process_id,
int route_id,
AccessibilityMode accessibility_mode,
base::ProcessHandle handle = base::kNullProcessHandle) {
base::DictionaryValue* target_data = new base::DictionaryValue();
target_data->SetInteger(kProcessIdField, process_id);
target_data->SetInteger(kRouteIdField, route_id);
target_data->SetString(kUrlField, url.spec());
target_data->SetString(kNameField, net::EscapeForHTML(name));
target_data->SetInteger(kPidField, base::GetProcId(handle));
target_data->SetString(kFaviconUrlField, favicon_url.spec());
target_data->SetInteger(kAccessibilityModeField,
accessibility_mode);
return target_data;
}
base::DictionaryValue* BuildTargetDescriptor(RenderViewHost* rvh) {
WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
WebContents::FromRenderViewHost(rvh));
AccessibilityMode accessibility_mode = web_contents->GetAccessibilityMode();
std::string title;
GURL url;
GURL favicon_url;
if (web_contents) {
// TODO(nasko): Fix the following code to use a consistent set of data
// across the URL, title, and favicon.
url = web_contents->GetURL();
title = base::UTF16ToUTF8(web_contents->GetTitle());
NavigationController& controller = web_contents->GetController();
NavigationEntry* entry = controller.GetVisibleEntry();
if (entry != NULL && entry->GetURL().is_valid())
favicon_url = entry->GetFavicon().url;
}
return BuildTargetDescriptor(url,
title,
favicon_url,
rvh->GetProcess()->GetID(),
rvh->GetRoutingID(),
accessibility_mode);
}
bool HandleRequestCallback(BrowserContext* current_context,
const std::string& path,
const WebUIDataSource::GotDataCallback& callback) {
if (path != kDataFile)
return false;
scoped_ptr<base::ListValue> rvh_list(new base::ListValue());
scoped_ptr<RenderWidgetHostIterator> widgets(
RenderWidgetHost::GetRenderWidgetHosts());
while (RenderWidgetHost* widget = widgets->GetNextHost()) {
// Ignore processes that don't have a connection, such as crashed tabs.
if (!widget->GetProcess()->HasConnection())
continue;
if (!widget->IsRenderView())
continue;
RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
BrowserContext* context = rwhi->GetProcess()->GetBrowserContext();
if (context != current_context)
continue;
RenderViewHost* rvh = RenderViewHost::From(widget);
rvh_list->Append(BuildTargetDescriptor(rvh));
}
scoped_ptr<base::DictionaryValue> data(new base::DictionaryValue());
data->Set("list", rvh_list.release());
data->SetInteger(
"global_a11y_mode",
BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode());
std::string json_string;
base::JSONWriter::Write(data.get(), &json_string);
callback.Run(base::RefCountedString::TakeString(&json_string));
return true;
}
} // namespace
AccessibilityUI::AccessibilityUI(WebUI* web_ui) : WebUIController(web_ui) {
// Set up the chrome://accessibility source.
WebUIDataSource* html_source =
WebUIDataSource::Create(kChromeUIAccessibilityHost);
web_ui->RegisterMessageCallback(
"toggleAccessibility",
base::Bind(&AccessibilityUI::ToggleAccessibility,
base::Unretained(this)));
web_ui->RegisterMessageCallback(
"toggleGlobalAccessibility",
base::Bind(&AccessibilityUI::ToggleGlobalAccessibility,
base::Unretained(this)));
web_ui->RegisterMessageCallback(
"requestAccessibilityTree",
base::Bind(&AccessibilityUI::RequestAccessibilityTree,
base::Unretained(this)));
// Add required resources.
html_source->SetJsonPath("strings.js");
html_source->AddResourcePath("accessibility.css", IDR_ACCESSIBILITY_CSS);
html_source->AddResourcePath("accessibility.js", IDR_ACCESSIBILITY_JS);
html_source->SetDefaultResource(IDR_ACCESSIBILITY_HTML);
html_source->SetRequestFilter(
base::Bind(&HandleRequestCallback,
web_ui->GetWebContents()->GetBrowserContext()));
BrowserContext* browser_context =
web_ui->GetWebContents()->GetBrowserContext();
WebUIDataSource::Add(browser_context, html_source);
}
AccessibilityUI::~AccessibilityUI() {}
void AccessibilityUI::ToggleAccessibility(const base::ListValue* args) {
std::string process_id_str;
std::string route_id_str;
int process_id;
int route_id;
CHECK_EQ(2U, args->GetSize());
CHECK(args->GetString(0, &process_id_str));
CHECK(args->GetString(1, &route_id_str));
CHECK(base::StringToInt(process_id_str, &process_id));
CHECK(base::StringToInt(route_id_str, &route_id));
RenderViewHost* rvh = RenderViewHost::FromID(process_id, route_id);
if (!rvh)
return;
WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
WebContents::FromRenderViewHost(rvh));
AccessibilityMode mode = web_contents->GetAccessibilityMode();
if ((mode & AccessibilityModeComplete) != AccessibilityModeComplete) {
web_contents->AddAccessibilityMode(AccessibilityModeComplete);
} else {
web_contents->SetAccessibilityMode(
BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode());
}
}
void AccessibilityUI::ToggleGlobalAccessibility(const base::ListValue* args) {
BrowserAccessibilityStateImpl* state =
BrowserAccessibilityStateImpl::GetInstance();
AccessibilityMode mode = state->accessibility_mode();
if ((mode & AccessibilityModeComplete) != AccessibilityModeComplete)
state->EnableAccessibility();
else
state->DisableAccessibility();
}
void AccessibilityUI::RequestAccessibilityTree(const base::ListValue* args) {
std::string process_id_str;
std::string route_id_str;
int process_id;
int route_id;
CHECK_EQ(2U, args->GetSize());
CHECK(args->GetString(0, &process_id_str));
CHECK(args->GetString(1, &route_id_str));
CHECK(base::StringToInt(process_id_str, &process_id));
CHECK(base::StringToInt(route_id_str, &route_id));
RenderViewHost* rvh = RenderViewHost::FromID(process_id, route_id);
if (!rvh) {
scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue());
result->SetInteger(kProcessIdField, process_id);
result->SetInteger(kRouteIdField, route_id);
result->Set("error", new base::StringValue("Renderer no longer exists."));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
return;
}
scoped_ptr<base::DictionaryValue> result(BuildTargetDescriptor(rvh));
WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
scoped_ptr<AccessibilityTreeFormatter> formatter(
AccessibilityTreeFormatter::Create(web_contents));
base::string16 accessibility_contents_utf16;
std::vector<AccessibilityTreeFormatter::Filter> filters;
filters.push_back(AccessibilityTreeFormatter::Filter(
base::ASCIIToUTF16("*"),
AccessibilityTreeFormatter::Filter::ALLOW));
formatter->SetFilters(filters);
formatter->FormatAccessibilityTree(&accessibility_contents_utf16);
result->Set("tree",
new base::StringValue(
base::UTF16ToUTF8(accessibility_contents_utf16)));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
}
} // namespace content
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