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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.fxa.login;
import java.security.NoSuchAlgorithmException;
import java.util.EnumSet;
import java.util.Set;
import org.mozilla.gecko.background.fxa.FxAccountClient;
import org.mozilla.gecko.browserid.BrowserIDKeyPair;
import org.mozilla.gecko.fxa.login.FxAccountLoginTransition.Transition;
import org.mozilla.gecko.fxa.login.State.StateLabel;
public class FxAccountLoginStateMachine {
public static final String LOG_TAG = FxAccountLoginStateMachine.class.getSimpleName();
public interface LoginStateMachineDelegate {
public FxAccountClient getClient();
public long getCertificateDurationInMilliseconds();
public long getAssertionDurationInMilliseconds();
public void handleTransition(Transition transition, State state);
public void handleFinal(State state);
public BrowserIDKeyPair generateKeyPair() throws NoSuchAlgorithmException;
}
public static class ExecuteDelegate {
protected final LoginStateMachineDelegate delegate;
protected final StateLabel desiredStateLabel;
// It's as difficult to detect arbitrary cycles as repeated states.
protected final Set<StateLabel> stateLabelsSeen = EnumSet.noneOf(StateLabel.class);
protected ExecuteDelegate(StateLabel initialStateLabel, StateLabel desiredStateLabel, LoginStateMachineDelegate delegate) {
this.delegate = delegate;
this.desiredStateLabel = desiredStateLabel;
this.stateLabelsSeen.add(initialStateLabel);
}
public FxAccountClient getClient() {
return delegate.getClient();
}
public long getCertificateDurationInMilliseconds() {
return delegate.getCertificateDurationInMilliseconds();
}
public long getAssertionDurationInMilliseconds() {
return delegate.getAssertionDurationInMilliseconds();
}
public BrowserIDKeyPair generateKeyPair() throws NoSuchAlgorithmException {
return delegate.generateKeyPair();
}
public void handleTransition(Transition transition, State state) {
// Always trigger the transition callback.
delegate.handleTransition(transition, state);
// Possibly trigger the final callback. We trigger if we're at our desired
// state, or if we've seen this state before.
StateLabel stateLabel = state.getStateLabel();
if (stateLabel == desiredStateLabel || stateLabelsSeen.contains(stateLabel)) {
delegate.handleFinal(state);
return;
}
// If this wasn't the last state, leave a bread crumb and move on to the
// next state.
stateLabelsSeen.add(stateLabel);
state.execute(this);
}
}
public void advance(State initialState, final StateLabel desiredStateLabel, final LoginStateMachineDelegate delegate) {
if (initialState.getStateLabel() == desiredStateLabel) {
// We're already where we want to be!
delegate.handleFinal(initialState);
return;
}
ExecuteDelegate executeDelegate = new ExecuteDelegate(initialState.getStateLabel(), desiredStateLabel, delegate);
initialState.execute(executeDelegate);
}
}
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