Before this patch, the shared fetch used plain insert, because it relied on
being the only place in the codebase where new RemoteActors get inserted. I was
hoping for that to be the case, but while I tweak things and handle fetching
URIs that can be an actor or a public key (for which ActorFetchShare isn't
sufficient without some smart modification), I'd like concurrent insertions to
be safe, without getting in the way of ActorFetchShare.
With this patch, it now uses insertBy', which doesn't mind concurrent
insertions.
I wrote a function handleOutboxNote that's supposed to do the whole outbox POST
handler process. There's an outbox item table in the DB now, I adapted things
in various source files. Ticket comment federation work is still in progress.
* Adapt DB related code to return the InstanceId and RemoteSharerId
* Previously, when fetching a known shared key, we were running a DB
check/update for the shared usage record. I noticed - and hopefully I
correctly noticed - that this check already runs when we discover the keyId
points to a shared key we already know. So, after successful sig
verification, there's no need to run the check again. So I removed it.
Before, things worked like this:
* Only signatures of Ed25519 keys could be verified
* Key encoding placed the plain binary Ed25519 key in the PEM, instead of the
key's ASN1 encoding
With this patch it now works like this:
* Ed25519 signatures are supported as before
* RSA keys are now supported too, assuming RSA-SHA256 signatures
* Both Ed25519 and RSA keys are encoded and decoded using actual PEM with ASN1
