Matthias Hanel 48c87c1447 Nats based resolver & avoiding nats account server in smaller deployments (#1550)
* Adding nats based resolver and bootstrap system account

These resolver operate on an exclusive  directory
Two types:
full: managing all jwt in the directory
    Will synchronize with other full resolver
    nats-account-server will also run such a resolver
cache: lru cache managing only a subset of all jwt in the directory
    Will lookup jwt from full resolver
    Can overwrite expiration with a ttl for the file

Both:
    track expiration of jwt and clean up
    Support reload
    Notify the server of changed jwt

Bootstrapping system account allows users signed with the system account
jwt to connect, without the server knowing the jwt.
This allows uploading jwt (including system account) using nats by
publishing to $SYS.ACCOUNT.<name>.CLAIMS.UPDATE
Sending a request, server will respond with the result of the operation.

Receive all jwt stored in one server by sending a
request to $SYS.ACCOUNT.CLAIMS.PACK
One server will respond with a message per stored jwt.
The end of the responses is indicated by an empty message.

The content of dirstore.go and dirstore_test.go was moved from
nats-account-server

Signed-off-by: Matthias Hanel <mh@synadia.com>
2020-08-18 13:58:41 -06:00
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NATS is a simple, secure and performant communications system for digital systems, services and devices. NATS is part of the Cloud Native Computing Foundation (CNCF). NATS has over 30 client language implementations, and its server can run on-premise, in the cloud, at the edge, and even on a Raspberry Pi. NATS can secure and simplify design and operation of modern distributed systems.

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