| // Copyright 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. |
| |
| package org.chromium.chromoting; |
| |
| import android.accounts.Account; |
| import android.accounts.AccountManager; |
| import android.accounts.AccountManagerCallback; |
| import android.accounts.AccountManagerFuture; |
| import android.accounts.AuthenticatorException; |
| import android.accounts.OperationCanceledException; |
| import android.app.Activity; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.SharedPreferences; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.text.Html; |
| import android.util.Log; |
| import android.view.Menu; |
| import android.view.MenuItem; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.ArrayAdapter; |
| import android.widget.TextView; |
| import android.widget.ListView; |
| import android.widget.Toast; |
| |
| import org.chromium.chromoting.jni.JniInterface; |
| import org.json.JSONArray; |
| import org.json.JSONException; |
| import org.json.JSONObject; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.Scanner; |
| |
| /** |
| * The user interface for querying and displaying a user's host list from the directory server. It |
| * also requests and renews authentication tokens using the system account manager. |
| */ |
| public class Chromoting extends Activity { |
| /** Only accounts of this type will be selectable for authentication. */ |
| private static final String ACCOUNT_TYPE = "com.google"; |
| |
| /** Scopes at which the authentication token we request will be valid. */ |
| private static final String TOKEN_SCOPE = "oauth2:https://www.googleapis.com/auth/chromoting " + |
| "https://www.googleapis.com/auth/googletalk"; |
| |
| /** Path from which to download a user's host list JSON object. */ |
| private static final String HOST_LIST_PATH = |
| "https://www.googleapis.com/chromoting/v1/@me/hosts?key="; |
| |
| /** Color to use for hosts that are online. */ |
| private static final String HOST_COLOR_ONLINE = "green"; |
| |
| /** Color to use for hosts that are offline. */ |
| private static final String HOST_COLOR_OFFLINE = "red"; |
| |
| /** User's account details. */ |
| private Account mAccount; |
| |
| /** Account auth token. */ |
| private String mToken; |
| |
| /** List of hosts. */ |
| private JSONArray mHosts; |
| |
| /** Account switcher. */ |
| private MenuItem mAccountSwitcher; |
| |
| /** Greeting at the top of the displayed list. */ |
| private TextView mGreeting; |
| |
| /** Host list as it appears to the user. */ |
| private ListView mList; |
| |
| /** Callback handler to be used for network operations. */ |
| private Handler mNetwork; |
| |
| /** |
| * Called when the activity is first created. Loads the native library and requests an |
| * authentication token from the system. |
| */ |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.main); |
| |
| // Get ahold of our view widgets. |
| mGreeting = (TextView)findViewById(R.id.hostList_greeting); |
| mList = (ListView)findViewById(R.id.hostList_chooser); |
| |
| // Bring native components online. |
| JniInterface.loadLibrary(this); |
| |
| // Thread responsible for downloading/displaying host list. |
| HandlerThread thread = new HandlerThread("auth_callback"); |
| thread.start(); |
| mNetwork = new Handler(thread.getLooper()); |
| |
| SharedPreferences prefs = getPreferences(MODE_PRIVATE); |
| if (prefs.contains("account_name") && prefs.contains("account_type")) { |
| // Perform authentication using saved account selection. |
| mAccount = new Account(prefs.getString("account_name", null), |
| prefs.getString("account_type", null)); |
| AccountManager.get(this).getAuthToken(mAccount, TOKEN_SCOPE, null, this, |
| new HostListDirectoryGrabber(this), mNetwork); |
| if (mAccountSwitcher != null) { |
| mAccountSwitcher.setTitle(mAccount.name); |
| } |
| } else { |
| // Request auth callback once user has chosen an account. |
| Log.i("auth", "Requesting auth token from system"); |
| AccountManager.get(this).getAuthTokenByFeatures( |
| ACCOUNT_TYPE, |
| TOKEN_SCOPE, |
| null, |
| this, |
| null, |
| null, |
| new HostListDirectoryGrabber(this), |
| mNetwork |
| ); |
| } |
| } |
| |
| /** Called when the activity is finally finished. */ |
| @Override |
| public void onDestroy() { |
| super.onDestroy(); |
| JniInterface.disconnectFromHost(); |
| } |
| |
| /** Called to initialize the action bar. */ |
| @Override |
| public boolean onCreateOptionsMenu(Menu menu) { |
| getMenuInflater().inflate(R.menu.chromoting_actionbar, menu); |
| mAccountSwitcher = menu.findItem(R.id.actionbar_accountswitcher); |
| if (mAccount != null) { |
| mAccountSwitcher.setTitle(mAccount.name); |
| } |
| |
| return super.onCreateOptionsMenu(menu); |
| } |
| |
| /** Called whenever an action bar button is pressed. */ |
| @Override |
| public boolean onOptionsItemSelected(MenuItem item) { |
| // The only button is the account switcher, so defer to the android accounts system now. |
| AccountManager.get(this).getAuthTokenByFeatures( |
| ACCOUNT_TYPE, |
| TOKEN_SCOPE, |
| null, |
| this, |
| null, |
| null, |
| new HostListDirectoryGrabber(this), |
| mNetwork |
| ); |
| return true; |
| } |
| |
| /** |
| * Processes the authentication token once the system provides it. Once in possession of such a |
| * token, attempts to request a host list from the directory server. In case of a bad response, |
| * this is retried once in case the system's cached auth token had expired. |
| */ |
| private class HostListDirectoryGrabber implements AccountManagerCallback<Bundle> { |
| /** Whether authentication has already been attempted. */ |
| private boolean mAlreadyTried; |
| |
| /** Communication with the screen. */ |
| private Activity mUi; |
| |
| /** Constructor. */ |
| public HostListDirectoryGrabber(Activity ui) { |
| mAlreadyTried = false; |
| mUi = ui; |
| } |
| |
| /** |
| * Retrieves the host list from the directory server. This method performs |
| * network operations and must be run an a non-UI thread. |
| */ |
| @Override |
| public void run(AccountManagerFuture<Bundle> future) { |
| Log.i("auth", "User finished with auth dialogs"); |
| try { |
| // Here comes our auth token from the Android system. |
| Bundle result = future.getResult(); |
| String accountName = result.getString(AccountManager.KEY_ACCOUNT_NAME); |
| String accountType = result.getString(AccountManager.KEY_ACCOUNT_TYPE); |
| String authToken = result.getString(AccountManager.KEY_AUTHTOKEN); |
| Log.i("auth", "Received an auth token from system"); |
| |
| synchronized (mUi) { |
| mAccount = new Account(accountName, accountType); |
| mToken = authToken; |
| getPreferences(MODE_PRIVATE).edit().putString("account_name", accountName). |
| putString("account_type", accountType).apply(); |
| } |
| |
| // Send our HTTP request to the directory server. |
| URLConnection link = |
| new URL(HOST_LIST_PATH + JniInterface.getApiKey()).openConnection(); |
| link.addRequestProperty("client_id", JniInterface.getClientId()); |
| link.addRequestProperty("client_secret", JniInterface.getClientSecret()); |
| link.setRequestProperty("Authorization", "OAuth " + authToken); |
| |
| // Listen for the server to respond. |
| StringBuilder response = new StringBuilder(); |
| Scanner incoming = new Scanner(link.getInputStream()); |
| Log.i("auth", "Successfully authenticated to directory server"); |
| while (incoming.hasNext()) { |
| response.append(incoming.nextLine()); |
| } |
| incoming.close(); |
| |
| // Interpret what the directory server told us. |
| JSONObject data = new JSONObject(String.valueOf(response)).getJSONObject("data"); |
| mHosts = data.getJSONArray("items"); |
| Log.i("hostlist", "Received host listing from directory server"); |
| } catch (RuntimeException ex) { |
| // Make sure any other failure is reported to the user (as an unknown error). |
| throw ex; |
| } catch (Exception ex) { |
| // Assemble error message to display to the user. |
| String explanation = getString(R.string.error_unknown); |
| if (ex instanceof OperationCanceledException) { |
| explanation = getString(R.string.error_auth_canceled); |
| } else if (ex instanceof AuthenticatorException) { |
| explanation = getString(R.string.error_no_accounts); |
| } else if (ex instanceof IOException) { |
| if (!mAlreadyTried) { // This was our first connection attempt. |
| Log.w("auth", "Unable to authenticate with (expired?) token"); |
| |
| // Ask system to renew the auth token in case it expired. |
| AccountManager authenticator = AccountManager.get(mUi); |
| synchronized (mUi) { |
| authenticator.invalidateAuthToken(mAccount.type, mToken); |
| mToken = null; |
| Log.i("auth", "Requesting auth token renewal"); |
| authenticator.getAuthToken( |
| mAccount, TOKEN_SCOPE, null, mUi, this, mNetwork); |
| } |
| |
| // We're not in an error state *yet*. |
| mAlreadyTried = true; |
| return; |
| } else { // Authentication truly failed. |
| Log.e("auth", "Fresh auth token was also rejected"); |
| explanation = getString(R.string.error_auth_failed); |
| } |
| } else if (ex instanceof JSONException) { |
| explanation = getString(R.string.error_unexpected_response); |
| runOnUiThread(new HostListDisplayer(mUi)); |
| } |
| |
| mHosts = null; |
| Log.w("auth", ex); |
| Toast.makeText(mUi, explanation, Toast.LENGTH_LONG).show(); |
| } |
| |
| // Share our findings with the user. |
| runOnUiThread(new HostListDisplayer(mUi)); |
| } |
| } |
| |
| /** Formats the host list and offers it to the user. */ |
| private class HostListDisplayer implements Runnable { |
| /** Communication with the screen. */ |
| private Activity mUi; |
| |
| /** Constructor. */ |
| public HostListDisplayer(Activity ui) { |
| mUi = ui; |
| } |
| |
| /** |
| * Updates the infotext and host list display. |
| * This method affects the UI and must be run on its same thread. |
| */ |
| @Override |
| public void run() { |
| synchronized (mUi) { |
| mAccountSwitcher.setTitle(mAccount.name); |
| } |
| |
| if (mHosts == null) { |
| mGreeting.setText(getString(R.string.inst_empty_list)); |
| mList.setAdapter(null); |
| return; |
| } |
| |
| mGreeting.setText(getString(R.string.inst_host_list)); |
| |
| ArrayAdapter<JSONObject> displayer = new HostListAdapter(mUi, R.layout.host); |
| Log.i("hostlist", "About to populate host list display"); |
| try { |
| int index = 0; |
| while (!mHosts.isNull(index)) { |
| displayer.add(mHosts.getJSONObject(index)); |
| ++index; |
| } |
| mList.setAdapter(displayer); |
| } |
| catch(JSONException ex) { |
| Log.w("hostlist", ex); |
| Toast.makeText( |
| mUi, getString(R.string.error_cataloging_hosts), Toast.LENGTH_LONG).show(); |
| |
| // Close the application. |
| finish(); |
| } |
| } |
| } |
| |
| /** Describes the appearance and behavior of each host list entry. */ |
| private class HostListAdapter extends ArrayAdapter<JSONObject> { |
| /** Constructor. */ |
| public HostListAdapter(Context context, int textViewResourceId) { |
| super(context, textViewResourceId); |
| } |
| |
| /** Generates a View corresponding to this particular host. */ |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| TextView target = (TextView)super.getView(position, convertView, parent); |
| |
| try { |
| final JSONObject host = getItem(position); |
| target.setText(Html.fromHtml(host.getString("hostName") + " (<font color = \"" + |
| (host.getString("status").equals("ONLINE") ? HOST_COLOR_ONLINE : |
| HOST_COLOR_OFFLINE) + "\">" + host.getString("status") + "</font>)")); |
| |
| if (host.getString("status").equals("ONLINE")) { // Host is online. |
| target.setOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View v) { |
| try { |
| synchronized (getContext()) { |
| JniInterface.connectToHost(mAccount.name, mToken, |
| host.getString("jabberId"), |
| host.getString("hostId"), |
| host.getString("publicKey"), |
| new Runnable() { |
| @Override |
| public void run() { |
| startActivity( |
| new Intent(getContext(), Desktop.class)); |
| } |
| }); |
| } |
| } |
| catch(JSONException ex) { |
| Log.w("host", ex); |
| Toast.makeText(getContext(), |
| getString(R.string.error_reading_host), |
| Toast.LENGTH_LONG).show(); |
| |
| // Close the application. |
| finish(); |
| } |
| } |
| }); |
| } else { // Host is offline. |
| // Disallow interaction with this entry. |
| target.setEnabled(false); |
| } |
| } |
| catch(JSONException ex) { |
| Log.w("hostlist", ex); |
| Toast.makeText(getContext(), |
| getString(R.string.error_displaying_host), |
| Toast.LENGTH_LONG).show(); |
| |
| // Close the application. |
| finish(); |
| } |
| |
| return target; |
| } |
| } |
| } |