* add a util method for padding base64 strings if they are not of an expected length
* return the original string if it already contains padding, do not throw
* add tests for padding method, and for token that needs padding
* improve bot token validation by trying to decode user id from token
Try to decode the user id from the supplied bot token as a way of validating the token. If this should fail, indicate that the token is invalid.
* Update the tokenutils tests to pass the new validation checks
* Add test case for CheckBotTokenValidity method
* lint: clean up whitespace
* Add check for null or whitespace string, lint whitespace
* fix userid conversion
* Add hint to user to check that token is not an oauth client secret
* Catch exception that can be thrown by GetString
* Refactor token conversion logic into it's own testable method
* Update the minimum bot token length to 58 char
- Updates the minimum length of a bot token to be 58 characters. An older 58 char bot token was found by Moiph
- Makes this value an internal const instead of a magic number
* update the TokenUtils tests for 58 char min
* Add input validation for bot tokens based on their length
* Add token validation to BaseDiscordClient#LoginAsync
Adds a TokenUtils class which is used to validate that tokens are correct
* Revert changes to DiscordRestApiClient
* Add Unit tests to the TokenUtils class, fix a logic error that was caught by those tests
* Allow for API to throw exceptions
Moves the validation of tokens to be inside of LoginInternalAsync, and writes a Warning to the console when the supplied tokens are invalid
