Android Open Source - final_app Wifi Config Manager

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CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2011 ZXing authors/*from w  w  w. java2  s .  co  m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android.wifi;

import java.util.regex.Pattern;

import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.util.Log;

import com.google.zxing.client.result.WifiParsedResult;

/**
 * @author Vikram Aggarwal
 * @author Sean Owen
 */
public final class WifiConfigManager extends AsyncTask<WifiParsedResult, Object, Object> {

  private static final String TAG = WifiConfigManager.class.getSimpleName();

  private static final Pattern HEX_DIGITS = Pattern.compile("[0-9A-Fa-f]+");

  private final WifiManager wifiManager;

  public WifiConfigManager(WifiManager wifiManager) {
    this.wifiManager = wifiManager;
  }

  @Override
  protected Object doInBackground(WifiParsedResult... args) {
    WifiParsedResult theWifiResult = args[0];
    // Start WiFi, otherwise nothing will work
    if (!wifiManager.isWifiEnabled()) {
      Log.i(TAG, "Enabling wi-fi...");
      if (wifiManager.setWifiEnabled(true)) {
        Log.i(TAG, "Wi-fi enabled");
      } else {
        Log.w(TAG, "Wi-fi could not be enabled!");
        return null;
      }
      // This happens very quickly, but need to wait for it to enable. A little busy wait?
      int count = 0;
      while (!wifiManager.isWifiEnabled()) {
        if (count >= 10) {
          Log.i(TAG, "Took too long to enable wi-fi, quitting");
          return null;
        }
        Log.i(TAG, "Still waiting for wi-fi to enable...");
        try {
          Thread.sleep(1000L);
        } catch (InterruptedException ie) {
          // continue
        }
        count++;
      }
    }
    String networkTypeString = theWifiResult.getNetworkEncryption();
    NetworkType networkType;
    try {
      networkType = NetworkType.forIntentValue(networkTypeString);
    } catch (IllegalArgumentException ignored) {
      Log.w(TAG, "Bad network type; see NetworkType values: " + networkTypeString);
      return null;
    }
    if (networkType == NetworkType.NO_PASSWORD) {
      changeNetworkUnEncrypted(wifiManager, theWifiResult);
    } else {
      String password = theWifiResult.getPassword();
      if (password != null && !password.isEmpty()) {
        if (networkType == NetworkType.WEP) {
          changeNetworkWEP(wifiManager, theWifiResult);
        } else if (networkType == NetworkType.WPA) {
          changeNetworkWPA(wifiManager, theWifiResult);
        }
      }
    }
    return null;
  }

  /**
   * Update the network: either create a new network or modify an existing network
   * 
   * @param config
   *            the new network configuration
   */
  private static void updateNetwork(WifiManager wifiManager, WifiConfiguration config) {
    Integer foundNetworkID = findNetworkInExistingConfig(wifiManager, config.SSID);
    if (foundNetworkID != null) {
      Log.i(TAG, "Removing old configuration for network " + config.SSID);
      wifiManager.removeNetwork(foundNetworkID);
      wifiManager.saveConfiguration();
    }
    int networkId = wifiManager.addNetwork(config);
    if (networkId >= 0) {
      // Try to disable the current network and start a new one.
      if (wifiManager.enableNetwork(networkId, true)) {
        Log.i(TAG, "Associating to network " + config.SSID);
        wifiManager.saveConfiguration();
      } else {
        Log.w(TAG, "Failed to enable network " + config.SSID);
      }
    } else {
      Log.w(TAG, "Unable to add network " + config.SSID);
    }
  }

  private static WifiConfiguration changeNetworkCommon(WifiParsedResult wifiResult) {
    WifiConfiguration config = new WifiConfiguration();
    config.allowedAuthAlgorithms.clear();
    config.allowedGroupCiphers.clear();
    config.allowedKeyManagement.clear();
    config.allowedPairwiseCiphers.clear();
    config.allowedProtocols.clear();
    // Android API insists that an ascii SSID must be quoted to be correctly handled.
    config.SSID = quoteNonHex(wifiResult.getSsid());
    config.hiddenSSID = wifiResult.isHidden();
    return config;
  }

  // Adding a WEP network
  private static void changeNetworkWEP(WifiManager wifiManager, WifiParsedResult wifiResult) {
    WifiConfiguration config = changeNetworkCommon(wifiResult);
    config.wepKeys[0] = quoteNonHex(wifiResult.getPassword(), 10, 26, 58);
    config.wepTxKeyIndex = 0;
    config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
    config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
    updateNetwork(wifiManager, config);
  }

  // Adding a WPA or WPA2 network
  private static void changeNetworkWPA(WifiManager wifiManager, WifiParsedResult wifiResult) {
    WifiConfiguration config = changeNetworkCommon(wifiResult);
    // Hex passwords that are 64 bits long are not to be quoted.
    config.preSharedKey = quoteNonHex(wifiResult.getPassword(), 64);
    config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
    config.allowedProtocols.set(WifiConfiguration.Protocol.WPA); // For WPA
    config.allowedProtocols.set(WifiConfiguration.Protocol.RSN); // For WPA2
    config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
    config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
    config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
    config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
    config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
    updateNetwork(wifiManager, config);
  }

  // Adding an open, unsecured network
  private static void changeNetworkUnEncrypted(WifiManager wifiManager, WifiParsedResult wifiResult) {
    WifiConfiguration config = changeNetworkCommon(wifiResult);
    config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
    updateNetwork(wifiManager, config);
  }

  private static Integer findNetworkInExistingConfig(WifiManager wifiManager, String ssid) {
    Iterable<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();
    for (WifiConfiguration existingConfig : existingConfigs) {
      if (existingConfig.SSID.equals(ssid)) {
        return existingConfig.networkId;
      }
    }
    return null;
  }

  private static String quoteNonHex(String value, int... allowedLengths) {
    return isHexOfLength(value, allowedLengths) ? value : convertToQuotedString(value);
  }

  /**
   * Encloses the incoming string inside double quotes, if it isn't already quoted.
   * 
   * @param s
   *            the input string
   * @return a quoted string, of the form "input". If the input string is null, it returns null as well.
   */
  private static String convertToQuotedString(String s) {
    if (s == null || s.isEmpty()) {
      return null;
    }
    // If already quoted, return as-is
    if (s.charAt(0) == '"' && s.charAt(s.length() - 1) == '"') {
      return s;
    }
    return '\"' + s + '\"';
  }

  /**
   * @param value
   *            input to check
   * @param allowedLengths
   *            allowed lengths, if any
   * @return true if value is a non-null, non-empty string of hex digits, and if allowed lengths are given, has an allowed length
   */
  private static boolean isHexOfLength(CharSequence value, int... allowedLengths) {
    if (value == null || !HEX_DIGITS.matcher(value).matches()) {
      return false;
    }
    if (allowedLengths.length == 0) {
      return true;
    }
    for (int length : allowedLengths) {
      if (value.length() == length) {
        return true;
      }
    }
    return false;
  }

}

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