chrome/android/java/src/org/chromium/chrome/browser/util/FeatureUtilities.java

// Copyright 2014 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.util;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Build;
import android.os.Bundle;
import android.os.UserManager;
import android.speech.RecognizerIntent;

import org.chromium.base.ThreadUtils;
import org.chromium.base.VisibleForTesting;
import org.chromium.sync.signin.AccountManagerHelper;

import java.util.List;

/**
 * A utility {@code class} meant to help determine whether or not certain features are supported by
 * this device.
 */
public class FeatureUtilities {
    private static Boolean sHasGoogleAccountAuthenticator;
    private static Boolean sHasRecognitionIntentHandler;

    /**
     * Determines whether or not the {@link RecognizerIntent#ACTION_WEB_SEARCH} {@link Intent}
     * is handled by any {@link android.app.Activity}s in the system.  The result will be cached for
     * future calls.  Passing {@code false} to {@code useCachedValue} will force it to re-query any
     * {@link android.app.Activity}s that can process the {@link Intent}.
     * @param context        The {@link Context} to use to check to see if the {@link Intent} will
     *                       be handled.
     * @param useCachedValue Whether or not to use the cached value from a previous result.
     * @return {@code true} if recognition is supported.  {@code false} otherwise.
     */
    public static boolean isRecognitionIntentPresent(Context context, boolean useCachedValue) {
        ThreadUtils.assertOnUiThread();
        if (sHasRecognitionIntentHandler == null || !useCachedValue) {
            PackageManager pm = context.getPackageManager();
            List<ResolveInfo> activities = pm.queryIntentActivities(
                    new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
            sHasRecognitionIntentHandler = activities.size() > 0;
        }

        return sHasRecognitionIntentHandler;
    }

    /**
     * Determines whether or not the user has a Google account (so we can sync) or can add one.
     * @param context The {@link Context} that we should check accounts under.
     * @return Whether or not sync is allowed on this device.
     */
    public static boolean canAllowSync(Context context) {
        return (hasGoogleAccountAuthenticator(context) && hasSyncPermissions(context)) ||
                hasGoogleAccounts(context);
    }

    @VisibleForTesting
    static boolean hasGoogleAccountAuthenticator(Context context) {
        if (sHasGoogleAccountAuthenticator == null) {
            AccountManagerHelper accountHelper = AccountManagerHelper.get(context);
            sHasGoogleAccountAuthenticator = accountHelper.hasGoogleAccountAuthenticator();
        }
        return sHasGoogleAccountAuthenticator;
    }

    @VisibleForTesting
    static boolean hasGoogleAccounts(Context context) {
        return AccountManagerHelper.get(context).hasGoogleAccounts();
    }

    @SuppressLint("InlinedApi")
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
    private static boolean hasSyncPermissions(Context context) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2) return true;

        UserManager manager = (UserManager) context.getSystemService(Context.USER_SERVICE);
        Bundle userRestrictions = manager.getUserRestrictions();
        return !userRestrictions.getBoolean(UserManager.DISALLOW_MODIFY_ACCOUNTS, false);
    }

    /**
     * Records the current document mode state with native-side feature utilities.
     * @param enabled Whether the document mode is enabled.
     */
    public static void setDocumentModeEnabled(boolean enabled) {
        nativeSetDocumentModeEnabled(enabled);
    }

    private static native void nativeSetDocumentModeEnabled(boolean enabled);
}