func CheckAndDownloadMailContent(client *pop3.Client, index int) (err error) {
filePath := filepath.Join(destination, strconv.Itoa(index))
if _, errFileStat := os.Stat(filePath); errFileStat != nil { // mail file not found
log.Printf("Downloading Mail:%d", index)
// THINK: check content integrity
var mailContent string
mailContent, err = client.Retr(index)
if err != nil {
return
}
//find newline at head of file
var lastNewline = 0
for i, b := range mailContent {
if b != '\n' {
lastNewline = i
break
}
}
rawMailContent := []byte(mailContent)[lastNewline:]
// it's safe to ignore parse error
fromAddress, _ := getFromAddress(rawMailContent)
if fromAddress == mailFrom {
log.Printf("Store mail content to file:%s", filePath)
err = ioutil.WriteFile(filePath, rawMailContent, 0644)
if err != nil {
return
}
}
}
return
}
