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package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"time"
"github.com/emersion/go-mbox"
"github.com/emersion/go-message/mail"
_ "github.com/emersion/go-message/charset"
)
// Prints the email addresses (one per line) of all senders by parsing an MBOX.
func main() {
mboxNamePtr := flag.String("mbox", "test.mbox", "The mailbox (in the mbox file format) to read")
sincePtr := flag.String("since", "1970-01-01", "Consider only messages since the given date (YYYY-MM-DD)")
flag.Parse()
const isoFormat = "2006-01-02"
since, err := time.Parse(isoFormat, *sincePtr)
if err != nil {
log.Fatalf("Date \"%v\" couldn't be parsed", *sincePtr)
}
PrintAllMboxSenders(*mboxNamePtr, since)
}
func PrintAllMboxSenders(fileName string, since time.Time) {
f, err := os.Open(fileName)
if err != nil {
log.Fatal(err)
}
defer func() {
if err = f.Close(); err != nil {
log.Fatal(err)
}
}()
fr := bufio.NewReader(f)
mr := mbox.NewReader(fr)
for {
r, err := mr.NextMessage()
if err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
PrintMessageSender(r, since)
}
}
func PrintMessageSender(r io.Reader, since time.Time) {
mr, err := mail.CreateReader(r)
if err != nil {
IgnoreMail(err, mr)
}
date, err := mr.Header.Date()
if err != nil {
IgnoreMail(err, mr)
return
} else if date.Before(since) {
return // Ignore this mail (too old)
}
addr, err := mr.Header.AddressList("From")
if err != nil {
IgnoreMail(err, mr)
return
} else if len(addr) != 1 {
IgnoreMail(fmt.Errorf("unexpected number of senders: %v", len(addr)), mr)
return
}
fmt.Println(addr[0].Address)
}
func IgnoreMail(err error, mailReader *mail.Reader) {
reason := err.Error()
id, _ := mailReader.Header.MessageID()
fmt.Fprintf(os.Stderr, "Warning: Ignored a mail with ID \"%v\" for the reason \"%v\".\n", id, reason)
}
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