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textproto_conn_logged.go
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textproto_conn_logged.go
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package email
import (
"io"
"fmt"
"log"
"net"
"strings"
"unicode/utf8"
"net/textproto"
)
const (
ANSI_RESET = "\u001b[0m"
ANSI_COLOR_RQ_CMD = "\u001b[38;5;11m" // yellow
ANSI_COLOR_RQ_BODY = "\u001b[38;5;14m" // cyan
ANSI_COLOR_RSP_OK = "\u001b[38;5;10m" // green
ANSI_COLOR_RSP_ERR = "\u001b[38;5;9m" // red
MODE_SEND = "C>"
MODE_RECV = "<S"
)
// wrap lines longer than `MaxLineLength`, indents lines after the first by two spaces.
func wrapLong(line string) (parts []string) {
tmp := []string{}
nLen := 0
commit := func() {
if nLen == 0 { return }
var indent string
if len(parts) > 0 {
indent = " "
}
parts = append(parts, indent + strings.Join(tmp, " "))
tmp = []string{}
nLen = 0
}
push := func(s string) {
wLen := utf8.RuneCountInString(s)
if (nLen + wLen + 1) > MaxLineLength {
commit()
}
tmp = append(tmp, s)
nLen += (wLen+1)
}
words := strings.Split(line, " ")
for _, W := range words {
push(W)
}
commit()
return
}
// indent every line in `txt` by the `indent` string.
func indentWrap(txt, indent string) string {
parts := []string{}
txt = strings.ReplaceAll(txt, "\r", "")
lines := strings.Split(txt, "\n")
for _, line := range lines {
runes := utf8.RuneCountInString(line)
if runes > MaxLineLength {
parts = append(parts, wrapLong(line)...)
} else {
parts = append(parts, line)
}
}
return indent + strings.Join(parts, "\n" + indent)
}
type smtpLog struct {
*log.Logger
Colors bool
}
func (L *smtpLog) log(txt, mode, color string) {
txt = indentWrap(txt, mode + "\t")
if L.Colors {
txt = color + txt + ANSI_RESET
}
L.Println("\n" + txt)
}
type loggedWriteCloser struct {
io.WriteCloser
smtpLog
}
func (WC loggedWriteCloser) Write(p []byte) (n int, err error) {
WC.smtpLog.log(string(p), MODE_SEND, ANSI_COLOR_RQ_BODY)
return WC.WriteCloser.Write(p)
}
type loggedTextProtoConn struct {
*textproto.Conn
smtpLog
}
func (TPC loggedTextProtoConn) Cmd(format string, args ...interface{}) (id uint, E error) {
txt := fmt.Sprintf(format, args...)
TPC.smtpLog.log(txt, MODE_SEND, ANSI_COLOR_RQ_CMD)
return TPC.Conn.Cmd(format, args...)
}
func (TPC loggedTextProtoConn) ReadResponse(expectCode int) (code int, message string, E error) {
code, message, E = TPC.Conn.ReadResponse(expectCode)
var txt string
var color string
if E == nil {
txt = fmt.Sprintf("%d - %s", code, message)
color = ANSI_COLOR_RSP_OK
} else {
txt = fmt.Sprintf("%d - %v", code, E)
color = ANSI_COLOR_RSP_ERR
}
TPC.smtpLog.log(txt, MODE_RECV, color)
return
}
func (TPC loggedTextProtoConn) DotWriter() io.WriteCloser {
return loggedWriteCloser{
WriteCloser: TPC.Conn.DotWriter(),
smtpLog: TPC.smtpLog,
}
}
/*
Can be used as a substitute CreateTextprotoConnFn to log the SMTP
conversation to a specified logger.
Example
// create target logger
pLog := log.New(os.Stdout, "", log.Ltime | log.Lmicroseconds)
// establilsh connection to server
HOST := "smtp.office365.com"
iConn, _ = net.Dial("tcp4", HOST + ":587",)
// create new session
email.NewClient(
iConn,
email.LoginAuth("user name", "password"),
HOST,
email.TLSConfig(HOST),
email.TextprotoLogged(pLog, true), // true for ANSI colors, false for no colors
)
*/
func TextprotoLogged(pLog *log.Logger, bColors bool) CreateTextprotoConnFn {
return func(iConn net.Conn) TextProtoConn {
return loggedTextProtoConn{
Conn: textproto.NewConn(iConn),
smtpLog: smtpLog{
Logger: pLog,
Colors: bColors,
},
}
}
}