10 "github.com/uber-go/zap"
16 stateAuth state = iota
22 errStateAuth = "not in AUTHORIZATION"
23 errStateTxn = "not in TRANSACTION"
24 errSyntax = "syntax error"
25 errDeletedMsg = "no such message - deleted"
28 type connection struct {
43 func AcceptConnection(netConn net.Conn, po PostOffice, log zap.Logger) {
46 tp: textproto.NewConn(netConn),
48 log: log.With(zap.Stringer("client", netConn.RemoteAddr())),
52 conn.ok(fmt.Sprintf("POP3 (mailpopbox) server %s", po.Name()))
55 conn.line, err = conn.tp.ReadLine()
57 conn.log.Error("ReadLine()", zap.Error(err))
63 if _, err := fmt.Sscanf(conn.line, "%s", &cmd); err != nil {
64 conn.err("invalid command")
68 switch strings.ToUpper(cmd) {
89 conn.err("unknown command")
94 func (conn *connection) ok(msg string) {
98 conn.tp.PrintfLine("+OK%s", msg)
101 func (conn *connection) err(msg string) {
104 conn.tp.PrintfLine("-ERR%s", msg)
108 func (conn *connection) doQUIT() {
109 defer conn.tp.Close()
112 err := conn.mb.Close()
114 conn.err("failed to remove some messages")
121 func (conn *connection) doUSER() {
122 if conn.state != stateAuth {
123 conn.err(errStateAuth)
127 conn.user = conn.line[len("USER "):]
131 func (conn *connection) doPASS() {
132 if conn.state != stateAuth {
133 conn.err(errStateAuth)
137 if len(conn.user) == 0 {
142 pass := conn.line[len("PASS "):]
143 if mbox, err := conn.po.OpenMailbox(conn.user, pass); err == nil {
144 conn.log.Info("authenticated", zap.String("user", conn.user))
145 conn.state = stateTxn
149 conn.log.Error("PASS", zap.Error(err))
150 conn.err(err.Error())
154 func (conn *connection) doSTAT() {
155 if conn.state != stateTxn {
156 conn.err(errStateTxn)
160 msgs, err := conn.mb.ListMessages()
162 conn.log.Error("STAT", zap.Error(err))
163 conn.err(err.Error())
169 for _, msg := range msgs {
177 conn.ok(fmt.Sprintf("%d %d", num, size))
180 func (conn *connection) doLIST() {
181 if conn.state != stateTxn {
182 conn.err(errStateTxn)
186 msgs, err := conn.mb.ListMessages()
188 conn.log.Error("LIST", zap.Error(err))
189 conn.err(err.Error())
193 conn.ok("scan listing")
194 for _, msg := range msgs {
195 conn.tp.PrintfLine("%d %d", msg.ID(), msg.Size())
197 conn.tp.PrintfLine(".")
200 func (conn *connection) doRETR() {
201 if conn.state != stateTxn {
202 conn.err(errStateTxn)
206 msg := conn.getRequestedMessage()
212 conn.err(errDeletedMsg)
216 rc, err := conn.mb.Retrieve(msg)
218 conn.log.Error("RETR", zap.Error(err))
219 conn.err(err.Error())
223 conn.ok(fmt.Sprintf("%d", msg.Size()))
225 w := conn.tp.DotWriter()
230 func (conn *connection) doDELE() {
231 if conn.state != stateTxn {
232 conn.err(errStateTxn)
236 msg := conn.getRequestedMessage()
242 conn.err(errDeletedMsg)
246 if err := conn.mb.Delete(msg); err != nil {
247 conn.log.Error("DELE", zap.Error(err))
248 conn.err(err.Error())
254 func (conn *connection) doRSET() {
255 if conn.state != stateTxn {
256 conn.err(errStateTxn)
263 func (conn *connection) getRequestedMessage() Message {
266 if _, err := fmt.Sscanf(conn.line, "%s %d", &cmd, &idx); err != nil {
272 conn.err("invalid message-number")
276 msg := conn.mb.GetMessage(idx)
278 conn.err("no such message")