private bool IsFinalInteraction(Result result)
{
LoginErrorResult error = result as LoginErrorResult;
if (error != null)
{
return(true);
}
UnjoinConfirmedResult unjoin = result as UnjoinConfirmedResult;
if (unjoin != null)
{
return(true);
}
return(false);
}
/// <summary>
/// Login the DarPooling Service network using username and password.
/// Check if the current node is responsible for holding data about the user.
/// If so, the given credential are checked, otherwise the request is
/// scheduled for forwarding.
/// </summary>
/// <param name="username">The username provided by the client</param>
/// <param name="pw_hash">The password provided by the client</param>
/// <returns>
/// a Result instance that represent the result of the Join operation; Specifically:
/// - a ConnectionErrorResult if the username has an invalid format
/// - a LoginErrorResult instance if the credentials don't match in the database
/// - a LoginOkResult if the credentials are valid.
/// </returns>
public Result Join(string username, string pw_hash)
{
Result joinResult;
// Determine the name of the node where the user registered. Based to
// the format, it MUST be the final token. Es. user@baseaddress/NODENAME
string registrationNode = username.Split('/').Last();
// The username has an invalid format, i.e. it is impossible to retrieve the
// name of the node where the user registered
if (registrationNode.Length == 0 )
{
joinResult = new LoginErrorResult();
joinResult.Comment = "Invalid username and/or password";
return joinResult;
}
// The user has registered in a different node. To confirm the join, we MUST
// forward the Join request to the appropriate node.
if (!registrationNode.Equals(this.NodeName))
{
ForwardRequiredResult forwardRequest = new ForwardRequiredResult();
forwardRequest.RequestID = serviceImpl.generateGUID();
forwardRequest.Destination = baseForwardAddress + registrationNode;
forwardRequest.Comment = "You were not registered in this node";
joinResult = forwardRequest;
return joinResult;
}
// Obtain the Read lock to determine if the user is actually registered.
userDatabaseLock.EnterReadLock();
try
{
//Console.WriteLine("{0} thread obtain the read lock in Join()", Thread.CurrentThread.Name);
userDatabase = XDocument.Load(userDatabasePath);
// Determine if the username and password have a match in the database
var registeredUserQuery = (from user in userDatabase.Descendants("User")
where user.Element("UserName").Value.Equals(username) &&
user.Element("Password").Value.Equals(pw_hash)
select user);
// The provided username and password don't match in the database.
if (registeredUserQuery.Count() == 0)
{
joinResult = new LoginErrorResult();
joinResult.Comment = "Invalid username and/or password";
return joinResult;
}
else
{ /** The Login is successful. */
LoginOkResult success = new LoginOkResult();
success.AuthorizedUsername = username;
success.Comment = "Account successfully verified. You can now access DarPooling";
joinResult = success;
return joinResult;
}
}
finally
{
//Console.WriteLine("{0} thread releases the read lock in Join()", Thread.CurrentThread.Name);
userDatabaseLock.ExitReadLock();
}
}
}// End RegisterUser
/// <summary>
/// Login the DarPooling Service network using username and password.
/// Check if the current node is responsible for holding data about the user.
/// If so, the given credential are checked, otherwise the request is
/// scheduled for forwarding.
/// </summary>
/// <param name="username">The username provided by the client</param>
/// <param name="pw_hash">The password provided by the client</param>
/// <returns>
/// a Result instance that represent the result of the Join operation; Specifically:
/// - a ConnectionErrorResult if the username has an invalid format
/// - a LoginErrorResult instance if the credentials don't match in the database
/// - a LoginOkResult if the credentials are valid.
/// </returns>
public Result Join(string username, string pw_hash)
{
Result joinResult;
// Determine the name of the node where the user registered. Based to
// the format, it MUST be the final token. Es. user@baseaddress/NODENAME
string registrationNode = username.Split('/').Last();
// The username has an invalid format, i.e. it is impossible to retrieve the
// name of the node where the user registered
if (registrationNode.Length == 0)
{
joinResult = new LoginErrorResult();
joinResult.Comment = "Invalid username and/or password";
return(joinResult);
}
// The user has registered in a different node. To confirm the join, we MUST
// forward the Join request to the appropriate node.
if (!registrationNode.Equals(this.NodeName))
{
ForwardRequiredResult forwardRequest = new ForwardRequiredResult();
forwardRequest.RequestID = serviceImpl.generateGUID();
forwardRequest.Destination = baseForwardAddress + registrationNode;
forwardRequest.Comment = "You were not registered in this node";
joinResult = forwardRequest;
return(joinResult);
}
// Obtain the Read lock to determine if the user is actually registered.
userDatabaseLock.EnterReadLock();
try
{
//Console.WriteLine("{0} thread obtain the read lock in Join()", Thread.CurrentThread.Name);
userDatabase = XDocument.Load(userDatabasePath);
// Determine if the username and password have a match in the database
var registeredUserQuery = (from user in userDatabase.Descendants("User")
where user.Element("UserName").Value.Equals(username) &&
user.Element("Password").Value.Equals(pw_hash)
select user);
// The provided username and password don't match in the database.
if (registeredUserQuery.Count() == 0)
{
joinResult = new LoginErrorResult();
joinResult.Comment = "Invalid username and/or password";
return(joinResult);
}
else
{ /** The Login is successful. */
LoginOkResult success = new LoginOkResult();
success.AuthorizedUsername = username;
success.Comment = "Account successfully verified. You can now access DarPooling";
joinResult = success;
return(joinResult);
}
}
finally
{
//Console.WriteLine("{0} thread releases the read lock in Join()", Thread.CurrentThread.Name);
userDatabaseLock.ExitReadLock();
}
}
