The Tor Browser: mobile/android/base/fxa/login/FxAccountLoginStateMachine.java@fc2d59ddac77

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 package org.mozilla.gecko.fxa.login;

     7 import java.security.NoSuchAlgorithmException;

     8 import java.util.HashSet;

     9 import java.util.Set;

    11 import org.mozilla.gecko.background.fxa.FxAccountClient;

    12 import org.mozilla.gecko.browserid.BrowserIDKeyPair;

    13 import org.mozilla.gecko.fxa.login.FxAccountLoginTransition.Transition;

    14 import org.mozilla.gecko.fxa.login.State.StateLabel;

    16 public class FxAccountLoginStateMachine {

    17   public static final String LOG_TAG = FxAccountLoginStateMachine.class.getSimpleName();

    19   public interface LoginStateMachineDelegate {

    20     public FxAccountClient getClient();

    21     public long getCertificateDurationInMilliseconds();

    22     public long getAssertionDurationInMilliseconds();

    23     public void handleTransition(Transition transition, State state);

    24     public void handleFinal(State state);

    25     public BrowserIDKeyPair generateKeyPair() throws NoSuchAlgorithmException;

    26   }

    28   public static class ExecuteDelegate {

    29     protected final LoginStateMachineDelegate delegate;

    30     protected final StateLabel desiredStateLabel;

    31     // It's as difficult to detect arbitrary cycles as repeated states.

    32     protected final Set<StateLabel> stateLabelsSeen = new HashSet<StateLabel>();

    34     protected ExecuteDelegate(StateLabel initialStateLabel, StateLabel desiredStateLabel, LoginStateMachineDelegate delegate) {

    35       this.delegate = delegate;

    36       this.desiredStateLabel = desiredStateLabel;

    37       this.stateLabelsSeen.add(initialStateLabel);

    38     }

    40     public FxAccountClient getClient() {

    41       return delegate.getClient();

    42     }

    44     public long getCertificateDurationInMilliseconds() {

    45       return delegate.getCertificateDurationInMilliseconds();

    46     }

    48     public long getAssertionDurationInMilliseconds() {

    49       return delegate.getAssertionDurationInMilliseconds();

    50     }

    52     public BrowserIDKeyPair generateKeyPair() throws NoSuchAlgorithmException {

    53       return delegate.generateKeyPair();

    54     }

    56     public void handleTransition(Transition transition, State state) {

    57       // Always trigger the transition callback.

    58       delegate.handleTransition(transition, state);

    60       // Possibly trigger the final callback. We trigger if we're at our desired

    61       // state, or if we've seen this state before.

    62       StateLabel stateLabel = state.getStateLabel();

    63       if (stateLabel == desiredStateLabel || stateLabelsSeen.contains(stateLabel)) {

    64         delegate.handleFinal(state);

    65         return;

    66       }

    68       // If this wasn't the last state, leave a bread crumb and move on to the

    69       // next state.

    70       stateLabelsSeen.add(stateLabel);

    71       state.execute(this);

    72     }

    73   }

    75   public void advance(State initialState, final StateLabel desiredStateLabel, final LoginStateMachineDelegate delegate) {

    76     if (initialState.getStateLabel() == desiredStateLabel) {

    77       // We're already where we want to be!

    78       delegate.handleFinal(initialState);

    79       return;

    80     }

    81     ExecuteDelegate executeDelegate = new ExecuteDelegate(initialState.getStateLabel(), desiredStateLabel, delegate);

    82     initialState.execute(executeDelegate);

    83   }

    84 }

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