gost

An SMTP server in Go for testing. Currently in Proof-Of-Concept.

Concept

Gost (Go SMTP Test) is meant to facilitate testing automated emails. The end goal a server that will accept connections via HTTP for clients (probably test runners) to register their desire to listen for an email. The server then receives an email via SMTP and notifies the client. The client will then either receive the content of the email via the RabbitMQ message, or initiate an HTTP request for the body of the email.

Client TCP Protocol

Testing agents use raw TCP sockets to connect to the Gost server, register pattern matchers, and await matches from the server.

Each message is terminated by the newline character '\n'.

Handshake

1. Client opens a connection to Gost (default port 60510)
2. Server sends HELLO
3. Client selects an appropriate version and sends OLLEH {"version": 3}
4. If the server supports the version, server sends OKAY, otherwise sends UNSUPPORTED and drops the connection.
5. Client begins main operative procedure

Main Operative Procedures, version 1

Client commands:

• PING, server responds PONG
• MATCH {"to": "[email protected]"}, server responds MATCHPUT {"match_id": <uuid>}

Server commands:

• PING, client responds PONG
• GOTEMAIL {"match_id": <uuid>, "email": {email...}}, client responds OKAY
• EXPIRED {"match_id": <uuid>}, client responds OKAY

Finishing

When the client is finished, sends QUIT and the server drops the connection.