smtp

type Command struct {
	// contains filtered or unexported fields
}

type Protocol struct {
	TLSPending  bool
	TLSUpgraded bool

	State   State
	Message *data.SMTPMessage

	Hostname string
	Ident    string

	MaximumLineLength int
	MaximumRecipients int

	// LogHandler is called for each log message. If nil, log messages will
	// be output using log.Printf instead.
	LogHandler func(message string, args ...interface{})
	// MessageReceivedHandler is called for each message accepted by the
	// SMTP protocol. It must return a MessageID or error. If nil, messages
	// will be rejected with an error.
	MessageReceivedHandler func(*data.SMTPMessage) (string, error)
	// ValidateSenderHandler should return true if the sender is valid,
	// otherwise false. If nil, all senders will be accepted.
	ValidateSenderHandler func(from string) bool
	// ValidateRecipientHandler should return true if the recipient is valid,
	// otherwise false. If nil, all recipients will be accepted.
	ValidateRecipientHandler func(to string) bool
	// ValidateAuthenticationhandler should return true if the authentication
	// parameters are valid, otherwise false. If nil, all authentication
	// attempts will be accepted.
	ValidateAuthenticationHandler func(mechanism string, args ...string) (errorReply *Reply, ok bool)
	// SMTPVerbFilter is called after each command is parsed, but before
	// any code is executed. This provides an opportunity to reject unwanted verbs,
	// e.g. to require AUTH before MAIL
	SMTPVerbFilter func(verb string, args ...string) (errorReply *Reply)
	// TLSHandler is called when a STARTTLS command is received.
	//
	// It should acknowledge the TLS request and set ok to true.
	// It should also return a callback which will be invoked after the reply is
	// sent. E.g., a TCP connection can only perform the upgrade after sending the reply
	//
	// Once the upgrade is complete, invoke the done function (e.g., from the returned callback)
	//
	// If TLS upgrade isn't possible, return an errorReply and set ok to false.
	TLSHandler func(done func(ok bool)) (errorReply *Reply, callback func(), ok bool)

	// GetAuthenticationMechanismsHandler should return an array of strings
	// listing accepted authentication mechanisms
	GetAuthenticationMechanismsHandler func() []string

	// RejectBrokenRCPTSyntax controls whether the protocol accepts technically
	// invalid syntax for the RCPT command. Set to true, the RCPT syntax requires
	// no space between `TO:` and the opening `<`
	RejectBrokenRCPTSyntax bool
	// RejectBrokenMAILSyntax controls whether the protocol accepts technically
	// invalid syntax for the MAIL command. Set to true, the MAIL syntax requires
	// no space between `FROM:` and the opening `<`
	RejectBrokenMAILSyntax bool
	// RequireTLS controls whether TLS is required for a connection before other
	// commands can be issued, applied at the protocol layer.
	RequireTLS bool
	// contains filtered or unexported fields
}

type Reply struct {
	Status int

	Done func()
	// contains filtered or unexported fields
}

type State int