/// <summary>
/// Gets the instance of <see cref="IntelSession"/> to use when
/// contacting the intel server.
/// </summary>
/// <param name="create">
/// <see langword="true"/> to create a new instance of
/// <see cref="IntelSession"/> if there is currently not an active
/// session; othwerise, return <see langword="null"/> if no session
/// is currently active.
/// </param>
protected virtual IntelSession GetSession(bool create)
{
Contract.Requires(IsRunning);
Contract.Ensures((Contract.Result<IntelSession>() != null) || !create);
var session = this.session;
if ((session != null) && session.IsConnected) {
// Existing session is still valid
return session;
} else if (create && (String.IsNullOrEmpty(this.username)
|| String.IsNullOrEmpty(this.passwordHash))) {
// Can't login without a username/password
throw new AuthenticationException();
} else if (create && this.lastAuthFailure.HasValue
&& (this.lastAuthFailure + this.authRetryTimeout > DateTime.UtcNow)) {
// Wait longer before trying to log in again
throw new AuthenticationException();
} else if (create) {
// Safe to create a new instance of IntelSession
session = new IntelSession(this.username, this.passwordHash, this.serviceUri);
this.session = session;
this.timerSession.Change(this.keepAlivePeriod, this.keepAlivePeriod);
this.lastIntel = DateTime.UtcNow;
this.Status = IntelStatus.Active;
this.OnPropertyChanged("Users");
return session;
} else if (session != null) {
// Session has expired
this.session = null;
timerSession.Change(Timeout.Infinite, Timeout.Infinite);
return null;
} else {
// No session open
return null;
}
}
/// <summary>
/// Stops the <see cref="IntelReporter"/> from providing
/// location data and events. <see cref="IntelReported"/>
/// events will no longer be raised.
/// </summary>
public void Stop()
{
Contract.Ensures(!this.IsRunning);
lock (this.syncRoot) {
try {
if (this.IsRunning) {
this.Status = IntelStatus.Stopping;
if (this.session != null) {
this.session.Dispose();
this.session = null;
}
this.channels.Stop();
this.Status = IntelStatus.Stopped;
}
} catch {
this.Status = IntelStatus.FatalError;
throw;
}
}
}
/// <inheritdoc/>
protected override void Dispose(bool disposing)
{
try {
if (disposing) {
// Clean up
lock (this.syncRoot) {
if (this.Status != IntelStatus.Disposed) {
this.Status = IntelStatus.Disposing;
if (this.session != null) {
this.session.Dispose();
this.session = null;
}
this.timerSession.Dispose();
this.channels.Dispose();
}
}
} else {
// Cannot safely clean up
}
} finally {
this.status = IntelStatus.Disposed;
base.Dispose(disposing);
}
}
/// <summary>
/// Updates the user's credentials and forces the service to
/// reauthenticate with the reporting service.
/// </summary>
/// <param name="username">
/// The TEST auth username.
/// </param>
/// <param name="password">
/// The plaintext TEST services password. It will be hashed
/// automatically.
/// </param>
/// <exception cref="AuthenticationException">
/// The credentials provided by the user are incorrect.
/// </exception>
public void Authenticate(string username, string password)
{
Contract.Requires<ArgumentException>(!string.IsNullOrEmpty(username));
Contract.Requires<ArgumentException>(!string.IsNullOrEmpty(password));
Contract.Requires<ObjectDisposedException>(this.Status != IntelStatus.Disposed);
Contract.Requires<InvalidOperationException>(this.Status != IntelStatus.FatalError);
// Verify the password is correct before saving anything
var passwordHash = IntelSession.HashPassword(password);
IntelSession testSession;
try {
testSession = new IntelSession(username, passwordHash, this.serviceUri);
} catch (WebException) {
lock (this.syncRoot) {
this.Status = IntelStatus.NetworkError;
throw;
}
}
// Update the program state
lock (this.syncRoot) {
this.username = username;
this.passwordHash = passwordHash;
if (this.session != null) {
this.session.Dispose();
}
this.session = testSession;
this.lastIntel = DateTime.UtcNow;
this.lastAuthFailure = null;
this.Status = IntelStatus.Active;
this.timerSession.Change(this.keepAlivePeriod, this.keepAlivePeriod);
this.OnPropertyChanged("Username");
this.OnPropertyChanged("PasswordHash");
this.OnPropertyChanged("Users");
}
}
