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@@ -0,0 +1,427 @@
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+// Copyright (c) 2020 Microsoft, Inc.
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+// Use of this source code is governed by the MIT license that can be
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+// found in the LICENSE file.
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+
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+#include "shell/browser/ui/webui/accessibility_ui.h"
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+
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+#include <utility>
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+
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+#include "base/bind.h"
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+#include "base/bind_helpers.h"
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+#include "base/command_line.h"
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+#include "base/json/json_writer.h"
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+#include "base/optional.h"
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+#include "base/strings/pattern.h"
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+#include "base/strings/string_number_conversions.h"
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+#include "base/strings/utf_string_conversions.h"
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+#include "base/values.h"
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+#include "build/build_config.h"
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+#include "chrome/common/chrome_features.h"
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+#include "chrome/common/pref_names.h"
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+#include "chrome/common/webui_url_constants.h"
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+#include "chrome/grit/dev_ui_browser_resources.h" // nogncheck
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+#include "components/pref_registry/pref_registry_syncable.h"
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+#include "components/prefs/pref_service.h"
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+#include "content/public/browser/accessibility_tree_formatter.h"
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+#include "content/public/browser/ax_event_notification_details.h"
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+#include "content/public/browser/browser_accessibility_state.h"
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+#include "content/public/browser/browser_thread.h"
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+#include "content/public/browser/favicon_status.h"
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+#include "content/public/browser/navigation_entry.h"
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+#include "content/public/browser/render_process_host.h"
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+#include "content/public/browser/render_view_host.h"
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+#include "content/public/browser/render_widget_host.h"
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+#include "content/public/browser/render_widget_host_iterator.h"
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+#include "content/public/browser/web_contents.h"
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+#include "content/public/browser/web_contents_delegate.h"
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+#include "content/public/browser/web_ui_data_source.h"
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+#include "net/base/escape.h"
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+#include "shell/browser/native_window.h"
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+#include "shell/browser/window_list.h"
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+#include "ui/accessibility/platform/ax_platform_node.h"
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+#include "ui/accessibility/platform/ax_platform_node_delegate.h"
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+#include "ui/base/webui/web_ui_util.h"
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+
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+namespace {
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+
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+static const char kTargetsDataFile[] = "targets-data.json";
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+
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+static const char kAccessibilityModeField[] = "a11yMode";
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+static const char kBrowsersField[] = "browsers";
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+static const char kErrorField[] = "error";
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+static const char kFaviconUrlField[] = "faviconUrl";
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+static const char kNameField[] = "name";
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+static const char kPagesField[] = "pages";
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+static const char kPidField[] = "pid";
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+static const char kSessionIdField[] = "sessionId";
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+static const char kProcessIdField[] = "processId";
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+static const char kRequestTypeField[] = "requestType";
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+static const char kRoutingIdField[] = "routingId";
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+static const char kTypeField[] = "type";
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+static const char kUrlField[] = "url";
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+static const char kTreeField[] = "tree";
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+
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+// Global flags
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+static const char kBrowser[] = "browser";
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+static const char kCopyTree[] = "copyTree";
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+static const char kHTML[] = "html";
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+static const char kInternal[] = "internal";
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+static const char kLabelImages[] = "labelImages";
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+static const char kNative[] = "native";
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+static const char kPage[] = "page";
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+static const char kPDF[] = "pdf";
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+static const char kScreenReader[] = "screenreader";
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+static const char kShowOrRefreshTree[] = "showOrRefreshTree";
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+static const char kText[] = "text";
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+static const char kWeb[] = "web";
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+
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+// Possible global flag values
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+static const char kDisabled[] = "disabled";
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+static const char kOff[] = "off";
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+static const char kOn[] = "on";
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+
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+std::unique_ptr<base::DictionaryValue> BuildTargetDescriptor(
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+ const GURL& url,
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+ const std::string& name,
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+ const GURL& favicon_url,
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+ int process_id,
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+ int routing_id,
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+ ui::AXMode accessibility_mode,
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+ base::ProcessHandle handle = base::kNullProcessHandle) {
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+ std::unique_ptr<base::DictionaryValue> target_data(
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+ new base::DictionaryValue());
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+ target_data->SetInteger(kProcessIdField, process_id);
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+ target_data->SetInteger(kRoutingIdField, routing_id);
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+ target_data->SetString(kUrlField, url.spec());
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+ target_data->SetString(kNameField, net::EscapeForHTML(name));
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+ target_data->SetInteger(kPidField, base::GetProcId(handle));
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+ target_data->SetString(kFaviconUrlField, favicon_url.spec());
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+ target_data->SetInteger(kAccessibilityModeField, accessibility_mode.mode());
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+ target_data->SetString(kTypeField, kPage);
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+ return target_data;
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+}
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+
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+std::unique_ptr<base::DictionaryValue> BuildTargetDescriptor(
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+ content::RenderViewHost* rvh) {
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+ content::WebContents* web_contents =
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+ content::WebContents::FromRenderViewHost(rvh);
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+ ui::AXMode accessibility_mode;
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+
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+ std::string title;
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+ GURL url;
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+ GURL favicon_url;
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+ if (web_contents) {
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+ url = web_contents->GetURL();
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+ title = base::UTF16ToUTF8(web_contents->GetTitle());
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+ content::NavigationController& controller = web_contents->GetController();
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+ content::NavigationEntry* entry = controller.GetVisibleEntry();
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+ if (entry != nullptr && entry->GetURL().is_valid()) {
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+ gfx::Image favicon_image = entry->GetFavicon().image;
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+ if (!favicon_image.IsEmpty()) {
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+ const SkBitmap* favicon_bitmap = favicon_image.ToSkBitmap();
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+ favicon_url = GURL(webui::GetBitmapDataUrl(*favicon_bitmap));
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+ }
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+ }
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+ accessibility_mode = web_contents->GetAccessibilityMode();
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+ }
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+
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+ return BuildTargetDescriptor(url, title, favicon_url,
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+ rvh->GetProcess()->GetID(), rvh->GetRoutingID(),
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+ accessibility_mode);
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+}
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+
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+std::unique_ptr<base::DictionaryValue> BuildTargetDescriptor(
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+ electron::NativeWindow* window) {
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+ std::unique_ptr<base::DictionaryValue> target_data(
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+ new base::DictionaryValue());
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+ target_data->SetInteger(kSessionIdField, window->window_id());
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+ target_data->SetString(kNameField, window->GetTitle());
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+ target_data->SetString(kTypeField, kBrowser);
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+ return target_data;
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+}
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+
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+bool ShouldHandleAccessibilityRequestCallback(const std::string& path) {
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+ return path == kTargetsDataFile;
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+}
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+
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+// Add property filters to the property_filters vector for the given property
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+// filter type. The attributes are passed in as a string with each attribute
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+// separated by a space.
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+void AddPropertyFilters(
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+ std::vector<content::AccessibilityTreeFormatter::PropertyFilter>&
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+ property_filters,
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+ const std::string& attributes,
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+ content::AccessibilityTreeFormatter::PropertyFilter::Type type) {
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+ for (const std::string& attribute : base::SplitString(
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+ attributes, " ", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY)) {
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+ property_filters.push_back(
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+ content::AccessibilityTreeFormatter::PropertyFilter(
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+ base::ASCIIToUTF16(attribute), type));
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+ }
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+}
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+
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+bool MatchesPropertyFilters(
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+ const std::vector<content::AccessibilityTreeFormatter::PropertyFilter>&
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+ property_filters,
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+ const base::string16& text) {
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+ bool allow = false;
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+ for (const auto& filter : property_filters) {
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+ if (base::MatchPattern(text, filter.match_str)) {
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+ switch (filter.type) {
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+ case content::AccessibilityTreeFormatter::PropertyFilter::ALLOW_EMPTY:
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+ allow = true;
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+ break;
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+ case content::AccessibilityTreeFormatter::PropertyFilter::ALLOW:
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+ allow = (!base::MatchPattern(text, base::UTF8ToUTF16("*=''")));
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+ break;
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+ case content::AccessibilityTreeFormatter::PropertyFilter::DENY:
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+ allow = false;
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+ break;
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+ }
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+ }
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+ }
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+ return allow;
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+}
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+
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+std::string RecursiveDumpAXPlatformNodeAsString(
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+ ui::AXPlatformNode* node,
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+ int indent,
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+ const std::vector<content::AccessibilityTreeFormatter::PropertyFilter>&
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+ property_filters) {
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+ if (!node)
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+ return "";
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+ std::string str(2 * indent, '+');
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+ std::string line = node->GetDelegate()->GetData().ToString();
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+ std::vector<std::string> attributes = base::SplitString(
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+ line, " ", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
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+ for (std::string attribute : attributes) {
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+ if (MatchesPropertyFilters(property_filters,
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+ base::UTF8ToUTF16(attribute))) {
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+ str += attribute + " ";
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+ }
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+ }
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+ str += "\n";
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+ for (int i = 0; i < node->GetDelegate()->GetChildCount(); i++) {
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+ gfx::NativeViewAccessible child = node->GetDelegate()->ChildAtIndex(i);
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+ ui::AXPlatformNode* child_node =
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+ ui::AXPlatformNode::FromNativeViewAccessible(child);
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+ str += RecursiveDumpAXPlatformNodeAsString(child_node, indent + 1,
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+ property_filters);
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+ }
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+ return str;
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+}
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+
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+bool IsValidJSValue(const std::string* str) {
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+ return str && str->length() < 5000U;
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+}
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+
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+void HandleAccessibilityRequestCallback(
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+ content::BrowserContext* current_context,
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+ const std::string& path,
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+ content::WebUIDataSource::GotDataCallback callback) {
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+ DCHECK(ShouldHandleAccessibilityRequestCallback(path));
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+
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+ base::DictionaryValue data;
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+ ui::AXMode mode =
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+ content::BrowserAccessibilityState::GetInstance()->GetAccessibilityMode();
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+ bool is_native_enabled = content::BrowserAccessibilityState::GetInstance()
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+ ->IsRendererAccessibilityEnabled();
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+ bool native = mode.has_mode(ui::AXMode::kNativeAPIs);
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+ bool web = mode.has_mode(ui::AXMode::kWebContents);
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+ bool text = mode.has_mode(ui::AXMode::kInlineTextBoxes);
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+ bool screenreader = mode.has_mode(ui::AXMode::kScreenReader);
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+ bool html = mode.has_mode(ui::AXMode::kHTML);
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+ bool pdf = mode.has_mode(ui::AXMode::kPDF);
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+
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+ // The "native" and "web" flags are disabled if
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+ // --disable-renderer-accessibility is set.
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+ data.SetString(kNative,
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+ is_native_enabled ? (native ? kOn : kOff) : kDisabled);
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+ data.SetString(kWeb, is_native_enabled ? (web ? kOn : kOff) : kDisabled);
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+
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+ // The "text", "screenreader" and "html" flags are only
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+ // meaningful if "web" is enabled.
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+ bool is_web_enabled = is_native_enabled && web;
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+ data.SetString(kText, is_web_enabled ? (text ? kOn : kOff) : kDisabled);
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+ data.SetString(kScreenReader,
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+ is_web_enabled ? (screenreader ? kOn : kOff) : kDisabled);
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+ data.SetString(kHTML, is_web_enabled ? (html ? kOn : kOff) : kDisabled);
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+
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+ // TODO(codebytere): enable use of this flag.
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+ //
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+ // The "labelImages" flag works only if "web" is enabled, the current profile
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+ // has the kAccessibilityImageLabelsEnabled preference set and the appropriate
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+ // command line switch has been used. Since this is so closely tied into user
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+ // prefs and causes bugs, we're disabling it for now.
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+ bool are_accessibility_image_labels_enabled = is_web_enabled;
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+ data.SetString(kLabelImages, kDisabled);
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+
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+ // The "pdf" flag is independent of the others.
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+ data.SetString(kPDF, pdf ? kOn : kOff);
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+
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+ // Always dump the Accessibility tree.
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+ data.SetString(kInternal, kOn);
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+
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+ std::unique_ptr<base::ListValue> rvh_list(new base::ListValue());
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+ std::unique_ptr<content::RenderWidgetHostIterator> widgets(
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+ content::RenderWidgetHost::GetRenderWidgetHosts());
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+
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+ while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
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+ // Ignore processes that don't have a connection, such as crashed tabs.
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+ if (!widget->GetProcess()->IsInitializedAndNotDead())
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+ continue;
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+ content::RenderViewHost* rvh = content::RenderViewHost::From(widget);
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+ if (!rvh)
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+ continue;
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+ content::WebContents* web_contents =
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+ content::WebContents::FromRenderViewHost(rvh);
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+ content::WebContentsDelegate* delegate = web_contents->GetDelegate();
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+ if (!delegate)
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+ continue;
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+ // Ignore views that are never user-visible, like background pages.
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+ if (delegate->IsNeverComposited(web_contents))
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+ continue;
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+ content::BrowserContext* context = rvh->GetProcess()->GetBrowserContext();
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+ if (context != current_context)
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+ continue;
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+
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+ std::unique_ptr<base::DictionaryValue> descriptor =
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+ BuildTargetDescriptor(rvh);
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+ descriptor->SetBoolean(kNative, is_native_enabled);
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+ descriptor->SetBoolean(kWeb, is_web_enabled);
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+ descriptor->SetBoolean(kLabelImages,
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+ are_accessibility_image_labels_enabled);
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+ rvh_list->Append(std::move(descriptor));
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+ }
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+
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+ data.Set(kPagesField, std::move(rvh_list));
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+
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+ std::unique_ptr<base::ListValue> window_list(new base::ListValue());
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+ for (auto* window : electron::WindowList::GetWindows()) {
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+ window_list->Append(BuildTargetDescriptor(window));
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+ }
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+
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+ data.Set(kBrowsersField, std::move(window_list));
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+
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+ std::string json_string;
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+ base::JSONWriter::Write(data, &json_string);
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+
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+ std::move(callback).Run(base::RefCountedString::TakeString(&json_string));
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+}
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+
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+} // namespace
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+
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+ElectronAccessibilityUI::ElectronAccessibilityUI(content::WebUI* web_ui)
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+ : content::WebUIController(web_ui) {
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+ // Set up the chrome://accessibility source.
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+ content::WebUIDataSource* html_source =
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+ content::WebUIDataSource::Create(chrome::kChromeUIAccessibilityHost);
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+
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+ // Add required resources.
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+ html_source->UseStringsJs();
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+ html_source->AddResourcePath("accessibility.css", IDR_ACCESSIBILITY_CSS);
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+ html_source->AddResourcePath("accessibility.js", IDR_ACCESSIBILITY_JS);
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+ html_source->SetDefaultResource(IDR_ACCESSIBILITY_HTML);
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+ html_source->SetRequestFilter(
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+ base::BindRepeating(&ShouldHandleAccessibilityRequestCallback),
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+ base::BindRepeating(&HandleAccessibilityRequestCallback,
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+ web_ui->GetWebContents()->GetBrowserContext()));
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+
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+ content::BrowserContext* browser_context =
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+ web_ui->GetWebContents()->GetBrowserContext();
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+ content::WebUIDataSource::Add(browser_context, html_source);
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+
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+ web_ui->AddMessageHandler(
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+ std::make_unique<ElectronAccessibilityUIMessageHandler>());
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+}
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+
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+ElectronAccessibilityUI::~ElectronAccessibilityUI() = default;
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+
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+ElectronAccessibilityUIMessageHandler::ElectronAccessibilityUIMessageHandler() =
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+ default;
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+
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+void ElectronAccessibilityUIMessageHandler::RequestNativeUITree(
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+ const base::ListValue* args) {
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+ const base::DictionaryValue* data;
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+ CHECK(args->GetDictionary(0, &data));
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+
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+ int window_id = *data->FindIntPath(kSessionIdField);
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+ const std::string* request_type_p = data->FindStringPath(kRequestTypeField);
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+ CHECK(IsValidJSValue(request_type_p));
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+ std::string request_type = *request_type_p;
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+ CHECK(request_type == kShowOrRefreshTree || request_type == kCopyTree);
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+ request_type = "accessibility." + request_type;
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+
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+ const std::string* allow_p = data->FindStringPath("filters.allow");
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+ CHECK(IsValidJSValue(allow_p));
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+ std::string allow = *allow_p;
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+ const std::string* allow_empty_p = data->FindStringPath("filters.allowEmpty");
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+ CHECK(IsValidJSValue(allow_empty_p));
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+ std::string allow_empty = *allow_empty_p;
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+ const std::string* deny_p = data->FindStringPath("filters.deny");
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+ CHECK(IsValidJSValue(deny_p));
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+ std::string deny = *deny_p;
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+
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+ AllowJavascript();
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+
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+ std::vector<content::AccessibilityTreeFormatter::PropertyFilter>
|
|
|
+ property_filters;
|
|
|
+ AddPropertyFilters(
|
|
|
+ property_filters, allow,
|
|
|
+ content::AccessibilityTreeFormatter::PropertyFilter::ALLOW);
|
|
|
+ AddPropertyFilters(
|
|
|
+ property_filters, allow_empty,
|
|
|
+ content::AccessibilityTreeFormatter::PropertyFilter::ALLOW_EMPTY);
|
|
|
+ AddPropertyFilters(property_filters, deny,
|
|
|
+ content::AccessibilityTreeFormatter::PropertyFilter::DENY);
|
|
|
+
|
|
|
+ for (auto* window : electron::WindowList::GetWindows()) {
|
|
|
+ if (window->window_id() == window_id) {
|
|
|
+ std::unique_ptr<base::DictionaryValue> result(
|
|
|
+ BuildTargetDescriptor(window));
|
|
|
+ gfx::NativeWindow native_window = window->GetNativeWindow();
|
|
|
+ ui::AXPlatformNode* node =
|
|
|
+ ui::AXPlatformNode::FromNativeWindow(native_window);
|
|
|
+ result->SetKey(kTreeField,
|
|
|
+ base::Value(RecursiveDumpAXPlatformNodeAsString(
|
|
|
+ node, 0, property_filters)));
|
|
|
+ CallJavascriptFunction(request_type, *(result.get()));
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // No browser with the specified |id| was found.
|
|
|
+ std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
|
|
|
+ result->SetInteger(kSessionIdField, window_id);
|
|
|
+ result->SetString(kTypeField, kBrowser);
|
|
|
+ result->SetString(kErrorField, "Window no longer exists.");
|
|
|
+ CallJavascriptFunction(request_type, *(result.get()));
|
|
|
+}
|
|
|
+
|
|
|
+void ElectronAccessibilityUIMessageHandler::RegisterMessages() {
|
|
|
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
|
|
|
+
|
|
|
+ web_ui()->RegisterMessageCallback(
|
|
|
+ "toggleAccessibility",
|
|
|
+ base::BindRepeating(&AccessibilityUIMessageHandler::ToggleAccessibility,
|
|
|
+ base::Unretained(this)));
|
|
|
+ web_ui()->RegisterMessageCallback(
|
|
|
+ "setGlobalFlag",
|
|
|
+ base::BindRepeating(&AccessibilityUIMessageHandler::SetGlobalFlag,
|
|
|
+ base::Unretained(this)));
|
|
|
+ web_ui()->RegisterMessageCallback(
|
|
|
+ "requestWebContentsTree",
|
|
|
+ base::BindRepeating(
|
|
|
+ &AccessibilityUIMessageHandler::RequestWebContentsTree,
|
|
|
+ base::Unretained(this)));
|
|
|
+ web_ui()->RegisterMessageCallback(
|
|
|
+ "requestNativeUITree",
|
|
|
+ base::BindRepeating(
|
|
|
+ &ElectronAccessibilityUIMessageHandler::RequestNativeUITree,
|
|
|
+ base::Unretained(this)));
|
|
|
+ web_ui()->RegisterMessageCallback(
|
|
|
+ "requestAccessibilityEvents",
|
|
|
+ base::BindRepeating(
|
|
|
+ &AccessibilityUIMessageHandler::RequestAccessibilityEvents,
|
|
|
+ base::Unretained(this)));
|
|
|
+}
|
Shelley Vohr