Added methods for working with usernames:
Check username (Validates a username and checks availability)
Update username (Changes username for the current user)
People are reporting that under some circumstances, an infinite
loop could happen when TLSharp tries to handle a reconnection to
a different DC, if the DC instructed to be used is the same as
the one that was used in the last connection.
Not sure how could this happen (although the analysis present in
this github issue [1] might help understand it), but this commit
helps to make TLSharp fail fast (with an exception) instead of an
infinite loop from now on, which will help avoiding people file
issues such as [2] and [3] and instead maybe file a proper bug
report easier to understand, to try to fix the underlying root
cause.
[1] https://github.com/sochix/TLSharp/issues/719
[2] https://github.com/sochix/TLSharp/issues/803
[3] https://github.com/sochix/TLSharp/issues/839
If a method that returns bool is never returning false,
it's essentially not giving any information at all, which
means that it should return void. This will help the
consumers of this API to stop thinking that the result
of this function means if the connection was succesful
(which it is, actually, but it was never returning false
because if there's any problem connecting, the result would
be an exception instead).
The method IsPhoneRegisteredAsync() was calling
RequestWithDcMigration() which was the real method
that made use of the _sender field, so we can move
the null check to there.
This will also help track down possible NullReferenceExceptions
that could happen when other callers of this method
arrive with a bad _sender, which might aid us trying
to fix#706.
There are different kind of MIGRATE errors that could be
thrown by the Telegram API, as evidenced by this recent
change:
b06f8a8e11
So this rename tries to make it consistent to the new
exception names:
* FILE_MIGRATE_x -> FileMigrationException
* USER_MIGRATE_y -> UserMigrationException
* PHONE_MIGRATE_z -> PhoneMigrationException
Instead of throwing a System.FormatException, capture the URL
thrown by the library itself so that the developer configures
the API_ID and API_HASH and places them in the app.config file.
Parsing the message of an exception to decide what to do
next is a bad practice, because it's easy that the message
might be changed by mistake in the future. To enforce the
coupling in a stronger way it's better to use exceptions
of different type depending on the kind of error, so that
we rely on the compiler enforcing the behaviour when doing
changes in this error handling areas in the future.
This also makes the code a bit more simple and readable.
