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adapter.go
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adapter.go
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package main
import (
"bytes"
"errors"
"fmt"
"net"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
const (
ErrPayloadError = "Error getting payload"
ErrAPIError = "Error fetching data"
ResponseNoResult = "500 NO%20RESULT\n"
ResponsePayloadError = "500 PAYLOAD%20ERROR\n"
)
// PostfixAdapter is an adapter for postfix postmap commands.
// See https://www.postfix.org/postmap.1.html
type PostfixAdapter struct {
client UserliService
}
// NewPostfixAdapter creates a new Handler with the given UserliService.
func NewPostfixAdapter(client UserliService) *PostfixAdapter {
return &PostfixAdapter{client: client}
}
// AliasHandler handles the get command for aliases.
// It fetches the destinations for the given alias.
// The response is a comma separated list of destinations.
func (p *PostfixAdapter) AliasHandler(conn net.Conn) {
defer conn.Close()
now := time.Now()
payload, err := p.payload(conn)
if err != nil {
log.WithError(err).Error(ErrPayloadError)
p.write(conn, []byte(ResponsePayloadError), now, "alias", "error")
return
}
aliases, err := p.client.GetAliases(payload)
if err != nil {
log.WithError(err).WithField("email", payload).Error(ErrAPIError)
p.write(conn, []byte("400 Error fetching aliases\n"), now, "alias", "error")
return
}
if len(aliases) == 0 {
p.write(conn, []byte(ResponseNoResult), now, "alias", "success")
return
}
p.write(conn, []byte(fmt.Sprintf("200 %s \n", strings.Join(aliases, ","))), now, "alias", "success")
}
// DomainHandler handles the get command for domains.
// It checks if the domain exists.
// The response is a single line with the status code.
func (p *PostfixAdapter) DomainHandler(conn net.Conn) {
defer conn.Close()
now := time.Now()
payload, err := p.payload(conn)
if err != nil {
log.WithError(err).Error("Error getting payload")
p.write(conn, []byte(ResponsePayloadError), now, "domain", "error")
return
}
exists, err := p.client.GetDomain(payload)
if err != nil {
log.WithError(err).WithField("domain", payload).Error(ErrAPIError)
p.write(conn, []byte("400 Error fetching domain\n"), now, "domain", "error")
return
}
if !exists {
p.write(conn, []byte(ResponseNoResult), now, "domain", "success")
return
}
p.write(conn, []byte("200 1\n"), now, "domain", "success")
}
// MailboxHandler handles the get command for mailboxes.
// It checks if the mailbox exists.
// The response is a single line with the status code.
func (p *PostfixAdapter) MailboxHandler(conn net.Conn) {
defer conn.Close()
now := time.Now()
payload, err := p.payload(conn)
if err != nil {
log.WithError(err).Error(ErrPayloadError)
p.write(conn, []byte(ResponsePayloadError), now, "mailbox", "error")
return
}
exists, err := p.client.GetMailbox(payload)
if err != nil {
log.WithError(err).WithField("email", payload).Error(ErrAPIError)
p.write(conn, []byte("400 Error fetching mailbox\n"), now, "mailbox", "error")
return
}
if !exists {
p.write(conn, []byte(ResponseNoResult), now, "mailbox", "success")
return
}
p.write(conn, []byte("200 1\n"), now, "mailbox", "success")
}
// SendersHandler handles the get command for senders.
// It fetches the senders for the given email.
// The response is a comma separated list of senders.
func (p *PostfixAdapter) SendersHandler(conn net.Conn) {
defer conn.Close()
now := time.Now()
payload, err := p.payload(conn)
if err != nil {
log.WithError(err).Error(ErrPayloadError)
p.write(conn, []byte(ResponsePayloadError), now, "senders", "error")
return
}
senders, err := p.client.GetSenders(payload)
if err != nil {
log.WithError(err).WithField("email", payload).Error(ErrAPIError)
p.write(conn, []byte("400 Error fetching senders\n"), now, "senders", "error")
return
}
if len(senders) == 0 {
p.write(conn, []byte(ResponseNoResult), now, "senders", "success")
return
}
p.write(conn, []byte(fmt.Sprintf("200 %s \n", strings.Join(senders, ","))), now, "senders", "success")
}
// payload reads the data from the connection. It checks for valid
// commands sent by postfix and returns the payload.
func (h *PostfixAdapter) payload(conn net.Conn) (string, error) {
data := make([]byte, 4096)
_, err := conn.Read(data)
if err != nil {
return "", err
}
data = bytes.Trim(data, "\x00")
parts := strings.Split(string(data), " ")
if len(parts) < 2 || parts[0] != "get" {
return "", errors.New("invalid or unsupported command")
}
payload := strings.TrimSuffix(parts[1], "\n")
log.WithFields(log.Fields{"command": parts[0], "payload": payload}).Debug("Received payload")
return payload, nil
}
func (h *PostfixAdapter) write(conn net.Conn, response []byte, now time.Time, handler, status string) {
log.WithFields(log.Fields{"response": string(response), "handler": handler, "status": status}).Debug("Writing response")
_, err := conn.Write(response)
if err != nil {
log.WithError(err).WithFields(log.Fields{"response": string(response), "handler": handler, "status": status}).Error("Error writing response")
}
requestDurations.With(prometheus.Labels{"handler": handler, "status": status}).Observe(time.Since(now).Seconds())
}