GUACAMOLE-1979: Allow setting required properties for connecting to MySQL 8.4 and later.

[jmuehlner]

These properties allow connecting to a MySQL 8.4+ database server.

Either the public key can be retrieved from the server and set using the mysql-server-rsa-public-key-file property, or the public key can be automatically retrieved by setting the mysql-allow-public-key-retrieval property.

[necouchman]

Changes look fine to me. Do older drivers and/or MySQL/MariaDB servers that don't support these properties react okay if/when they are set?

[jmuehlner]

Changes look fine to me. Do older drivers and/or MySQL/MariaDB servers that don't support these properties react okay if/when they are set?

Yep, confirmed that all of these new properties don't do anything when connecting to a database that doesn't support them. I tested with MySQL 5.3 and tried setting allowPublicKeyRetrieval to both "true" and "false", as well as setting serverRsaPublicKeyFile to both valid and invalid file paths, and I was able to connect as normal.

I also tried setting various invalid/unknown properties with both the MySQL and MariaDB drivers and they were simply ignored.

[necouchman]

@jmuehlner One other question - this is currently targeted at the main branch - wasn't sure if the aim is to get this into the 1.6.0 release, or you're good with it waiting until the next one? Don't know if you're considering it a bug or not?

[jmuehlner]

@jmuehlner One other question - this is currently targeted at the main branch - wasn't sure if the aim is to get this into the 1.6.0 release, or you're good with it waiting until the next one? Don't know if you're considering it a bug or not?

Yeah, I was thinking it might be better to avoid increasing the scope of 1.6.0 further. This isn't really a bug exactly - it's more of an improvement enabling the use of later MySQL versions.