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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/common/view_message_enums.h"
#include "content/port/browser/render_widget_host_view_port.h"
#include "content/public/browser/browser_thread.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/web_contents.h"
#include "content/public/browser/web_ui_data_source.h"
#include "content/public/common/url_constants.h"
#include "grit/content_resources.h"
#include "net/base/escape.h"
using base::FundamentalValue;
using base::ListValue;
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 {
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) {
DictionaryValue* target_data = new 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;
}
DictionaryValue* BuildTargetDescriptor(RenderViewHost* rvh) {
WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
std::string title;
RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rvh);
AccessibilityMode accessibility_mode = rwhi->accessibility_mode();
GURL url;
GURL favicon_url;
if (web_contents) {
url = web_contents->GetURL();
title = UTF16ToUTF8(web_contents->GetTitle());
NavigationController& controller = web_contents->GetController();
NavigationEntry* entry = controller.GetActiveEntry();
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);
}
void SendTargetsData(
const WebUIDataSource::GotDataCallback& callback) {
scoped_ptr<ListValue> rvh_list(new ListValue());
for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator());
!it.IsAtEnd(); it.Advance()) {
RenderProcessHost* render_process_host = it.GetCurrentValue();
DCHECK(render_process_host);
// Ignore processes that don't have a connection, such as crashed tabs.
if (!render_process_host->HasConnection())
continue;
RenderProcessHost::RenderWidgetHostsIterator rwh_it(
render_process_host->GetRenderWidgetHostsIterator());
for (; !rwh_it.IsAtEnd(); rwh_it.Advance()) {
const RenderWidgetHost* rwh = rwh_it.GetCurrentValue();
DCHECK(rwh);
if (!rwh || !rwh->IsRenderView())
continue;
RenderViewHost* rvh =
RenderViewHost::From(const_cast<RenderWidgetHost*>(rwh));
rvh_list->Append(BuildTargetDescriptor(rvh));
}
}
scoped_ptr<DictionaryValue> data(new DictionaryValue());
data->Set("list", rvh_list.release());
scoped_ptr<FundamentalValue> a11y_mode(new FundamentalValue(
BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode()));
data->Set("global_a11y_mode", a11y_mode.release());
std::string json_string;
base::JSONWriter::Write(data.get(), &json_string);
callback.Run(base::RefCountedString::TakeString(&json_string));
}
bool HandleRequestCallback(
const std::string& path,
const WebUIDataSource::GotDataCallback& callback) {
if (path != kDataFile)
return false;
SendTargetsData(callback);
return true;
}
} // namespace
AccessibilityUI::AccessibilityUI(WebUI* web_ui)
: WebUIController(web_ui) {
// Set up the chrome://accessibility source.
WebUIDataSource* html_source =
WebUIDataSource::Create(kChromeUIAccessibilityHost);
html_source->SetUseJsonJSFormatV2();
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));
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(args->GetSize() == 2);
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;
RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rvh);
if (!rwhi)
return;
AccessibilityMode mode = rwhi->accessibility_mode();
if (mode == AccessibilityModeOff)
rwhi->SetAccessibilityMode(AccessibilityModeComplete);
else
rwhi->SetAccessibilityMode(AccessibilityModeOff);
}
void AccessibilityUI::ToggleGlobalAccessibility(const base::ListValue* args) {
BrowserAccessibilityStateImpl* state =
BrowserAccessibilityStateImpl::GetInstance();
AccessibilityMode mode = state->accessibility_mode();
AccessibilityMode new_mode = (mode == AccessibilityModeOff
? AccessibilityModeComplete
: AccessibilityModeOff);
state->SetAccessibilityMode(new_mode);
}
void AccessibilityUI::RequestAccessibilityTree(const base::ListValue* args) {
std::string process_id_str;
std::string route_id_str;
int process_id;
int route_id;
CHECK(args->GetSize() == 2);
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<DictionaryValue> result(new DictionaryValue());
result->SetInteger(kProcessIdField, process_id);
result->SetInteger(kRouteIdField, route_id);
result->Set("error", new StringValue("Renderer no longer exists."));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
return;
}
scoped_ptr<DictionaryValue> result(BuildTargetDescriptor(rvh));
RenderWidgetHostViewPort* host_view = static_cast<RenderWidgetHostViewPort*>(
WebContents::FromRenderViewHost(rvh)->GetRenderWidgetHostView());
if (!host_view) {
result->Set("error", new StringValue("Could not get accessibility tree."));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
return;
}
scoped_ptr<AccessibilityTreeFormatter> formatter(
AccessibilityTreeFormatter::Create(rvh));
string16 accessibility_contents_utf16;
BrowserAccessibilityManager* manager =
host_view->GetBrowserAccessibilityManager();
if (!manager) {
result->Set("error", new StringValue("Could not get accessibility tree."));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
return;
}
std::vector<AccessibilityTreeFormatter::Filter> filters;
filters.push_back(AccessibilityTreeFormatter::Filter(
ASCIIToUTF16("*"),
AccessibilityTreeFormatter::Filter::ALLOW));
formatter->SetFilters(filters);
formatter->FormatAccessibilityTree(&accessibility_contents_utf16);
result->Set("tree",
new StringValue(UTF16ToUTF8(accessibility_contents_utf16)));
web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
}
} // namespace content
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