Add a section to Site Settings listing USB devices.

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbDevicePreferences.java

+// Copyright 2016 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.
+
+package org.chromium.chrome.browser.preferences.website;
+
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.PreferenceFragment;
+import android.preference.PreferenceScreen;
+import android.support.v4.view.MenuItemCompat;
+import android.support.v7.widget.SearchView;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.inputmethod.EditorInfo;
+import android.widget.ListView;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.help.HelpAndFeedback;
+import org.chromium.chrome.browser.profiles.Profile;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+/**
+ * Shows the list of sites that the user has granted access to a particular USB device.
+ */
+public class UsbDevicePreferences
+        extends PreferenceFragment implements Preference.OnPreferenceClickListener {
+    public static final String EXTRA_USB_INFOS = "org.chromium.chrome.preferences.usb_infos";
+    public static final String EXTRA_SITES = "org.chromium.chrome.preferences.site_set";
+    public static final String EXTRA_CATEGORY =
+            "org.chromium.chrome.preferences.content_settings_type";
+
+    public static final String PREF_OBJECT_NAME = "object_name";
+
+    // The site settings category we are showing.
+    private SiteSettingsCategory mCategory;
+    // Canonical example of the USB device being examined.
+    private UsbInfo mUsbInfo;
+    // All of the USB device permission entries matching the canonical device.
+    private ArrayList<UsbInfo> mUsbInfos;
+    // The set of sites to display.
+    private ArrayList<Website> mSites;
+    // The view for searching the list of items.
+    private SearchView mSearchView;
+    // If not blank, represents a substring to use to search for site names.
+    private String mSearch = "";
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public void onActivityCreated(Bundle savedInstanceState) {
+        addPreferencesFromResource(R.xml.usb_device_preferences);
+        ListView listView = (ListView) getView().findViewById(android.R.id.list);
+        listView.setDivider(null);
+
+        int contentSettingsType = getArguments().getInt(EXTRA_CATEGORY);
+        mCategory = SiteSettingsCategory.fromContentSettingsType(contentSettingsType);
+        mUsbInfos = (ArrayList<UsbInfo>) getArguments().getSerializable(EXTRA_USB_INFOS);
+        mUsbInfo = mUsbInfos.get(0);
+        mSites = (ArrayList<Website>) getArguments().getSerializable(EXTRA_SITES);
+        String title = getArguments().getString(SingleCategoryPreferences.EXTRA_TITLE);
+        if (title != null) getActivity().setTitle(title);
+
+        setHasOptionsMenu(true);
+
+        super.onActivityCreated(savedInstanceState);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        menu.clear();
+        inflater.inflate(R.menu.website_preferences_menu, menu);
+
+        MenuItem searchItem = menu.findItem(R.id.search);
+        mSearchView = (SearchView) MenuItemCompat.getActionView(searchItem);
+        mSearchView.setImeOptions(EditorInfo.IME_FLAG_NO_FULLSCREEN);
+        SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
+            @Override
+            public boolean onQueryTextSubmit(String query) {
+                return true;
+            }
+
+            @Override
+            public boolean onQueryTextChange(String query) {
+                // Make search case-insensitive.
+                query = query.toLowerCase();
+
+                if (query.equals(mSearch)) return true;
+
+                mSearch = query;
+                getInfo();
+                return true;
+            }
+        };
+        mSearchView.setOnQueryTextListener(queryTextListener);
+
+        MenuItem help =
+                menu.add(Menu.NONE, R.id.menu_id_targeted_help, Menu.NONE, R.string.menu_help);
+        help.setIcon(R.drawable.ic_help_and_feedback);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (item.getItemId() == R.id.menu_id_targeted_help) {
+            HelpAndFeedback.getInstance(getActivity())
+                    .show(getActivity(), getString(R.string.help_context_settings),
+                            Profile.getLastUsedProfile(), null);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        if (mSites == null) {
+            getInfo();
+        } else {
+            resetList();
+        }
+    }
+
+    @Override
+    public boolean onPreferenceClick(Preference preference) {
+        if (PREF_OBJECT_NAME.equals(preference.getKey())) {
+            for (int i = 0; i < mUsbInfos.size(); ++i) mUsbInfos.get(i).revoke();
+            getActivity().finish();
+            return true;
+        }
+
+        return false;
+    }
+
+    private class ResultsPopulator implements WebsitePermissionsFetcher.WebsitePermissionsCallback {
+        @Override
+        public void onWebsitePermissionsAvailable(Collection<Website> sites) {
+            // This method may be called after the activity has been destroyed.
+            // In that case, bail out.
+            if (getActivity() == null) return;
+
+            mUsbInfos.clear();
+            mSites = new ArrayList<Website>();
+            for (Website site : sites) {
+                for (UsbInfo info : site.getUsbInfo()) {
+                    if (info.getObject().equals(mUsbInfo.getObject())) {
+                        mUsbInfos.add(info);
+                        if (mSearch.isEmpty() || site.getTitle().toLowerCase().contains(mSearch)) {
+                            mSites.add(site);
+                        }
+                    }
+                }
+            }
+
+            // After revoking a site's permission to access a device the user may end up back at
+            // this activity. It is awkward to display this empty list because there's no action
+            // that can be taken from it. In this case we dismiss this activity as well, taking
+            // them back to UsbChooserPreferences which will now no longer offer the option to
+            // examine the permissions for this device.
+            if (mUsbInfos.isEmpty()) {
+                getActivity().finish();
+            } else {
+                resetList();
+            }
+        }
+    }
+
+    /**
+     * Refreshes the list of sites with access to the object being examined.
+     *
+     * resetList() is called to refresh the view when the data is ready.
+     */
+    private void getInfo() {
+        WebsitePermissionsFetcher fetcher = new WebsitePermissionsFetcher(new ResultsPopulator());
+        fetcher.fetchPreferencesForCategory(mCategory);
+    }
+
+    private void resetList() {
+        getPreferenceScreen().removeAll();
+        addPreferencesFromResource(R.xml.usb_device_preferences);
+
+        PreferenceScreen preferenceScreen = getPreferenceScreen();
+        Preference header = preferenceScreen.findPreference(PREF_OBJECT_NAME);
+        header.setTitle(mUsbInfo.getName());
+        header.setOnPreferenceClickListener(this);
+
+        for (int i = 0; i < mSites.size(); ++i) {
+            Website site = mSites.get(i);
+            Preference preference = new WebsitePreference(getActivity(), site, mCategory);
+            preference.getExtras().putSerializable(SingleWebsitePreferences.EXTRA_SITE, site);
+            preference.setFragment(SingleWebsitePreferences.class.getCanonicalName());
+            preferenceScreen.addPreference(preference);
+        }
+
+        // Force this list to be reloaded if the activity is resumed.
+        mSites = null;
+    }
+}