Add support for SAN certs (multiple domains)

[axelfontaine]

No description provided.

[shred]

Actually, it is already added and works fine for me. Each domain needs to be authorized individually. After that, create a CSR with SAN of all domains. You can use the CSRBuilder (in the acme4j-utils module) for that:

CSRBuilder csrb = new CSRBuilder();
csrb.addDomain("example.org");
csrb.addDomain("www.example.org");
// you can add even more domains...
csrb.sign(domainKeyPair);
URI certUri = client.requestCertificate(account, csrb.getEncoded());

I have successfully retrieved SAN certs that way.

[axelfontaine]

Awesome! Thank you! You could probably even just copy paste this and add it to the docs :-)

Great work BTW! Small single-purpose library. Solves one problem and solves it well. Almost no dependencies and great documentation. This is how things should be 👍

[shred]

The example was copied from the docs... ;-) But indeed, I could explain a little more how to get SAN certs.

[axelfontaine]

I had actually read that page and somehow missed it. Sorry about the trouble and thanks again!

[shred]

No trouble at all! Thank you for your positive feedback!