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|
package smtp
import (
"dove/config"
mailModel "dove/models/mail"
mailRepo "dove/repositories/mail"
"dove/utils/email"
"dove/utils/errors"
"dove/utils/logger"
"dove/utils/storage"
"fmt"
"io"
"net"
"strings"
"time"
gosmtp "github.com/emersion/go-smtp"
)
type Session struct {
fromAddress string
toAddresses []string
}
func (self *Session) AuthPlain(username string, password string) error {
if !config.SMTP.AuthRequired {
return nil
}
if username != config.SMTP.Username || password != config.SMTP.Password {
logger.Warnf(LogPrefix, AuthFailed, username)
return errors.Error(InvalidCredentials)
}
return nil
}
func (self *Session) Mail(senderAddress string, _ *gosmtp.MailOptions) error {
logger.Debugf(LogPrefix, MailFrom, senderAddress)
self.fromAddress = senderAddress
return nil
}
func (self *Session) Rcpt(recipientAddress string, _ *gosmtp.RcptOptions) error {
logger.Debugf(LogPrefix, Recipient, recipientAddress)
self.toAddresses = append(self.toAddresses, recipientAddress)
return nil
}
func (self *Session) Data(messageReader io.Reader) error {
rawMessage, readError := io.ReadAll(messageReader)
if readError != nil {
return readError
}
logger.Infof(LogPrefix, MessageReceived, len(rawMessage), self.fromAddress, self.toAddresses)
parsedEmail, parseError := email.Parse(rawMessage)
if parseError != nil {
logger.Errorf(LogPrefix, MessageParseFailed, parseError)
return parseError
}
deliveredToLocal := false
for _, recipientAddress := range self.toAddresses {
recipientDomain := extractDomain(recipientAddress)
if recipientDomain == "" || !domainHasMXRecords(recipientDomain) {
logger.Warnf(LogPrefix, UnknownRecipientDomain, recipientDomain)
continue
}
recipientMailbox := mailRepo.FindMailboxByAddress(recipientAddress)
if recipientMailbox == nil {
aliasMailbox := mailRepo.FindMailboxByAlias(recipientAddress)
if aliasMailbox != nil {
recipientMailbox = aliasMailbox
}
}
if recipientMailbox != nil {
deliverError := deliverToLocalMailbox(recipientMailbox, parsedEmail, rawMessage)
if deliverError != nil {
logger.Errorf(LogPrefix, DeliveryFailed, recipientAddress, deliverError)
continue
}
logger.Infof(LogPrefix, DeliverySuccess, recipientAddress)
deliveredToLocal = true
} else {
logger.Debugf(LogPrefix, RecipientNotLocal, recipientAddress)
}
}
if !deliveredToLocal {
logger.Warnf(LogPrefix, NoLocalRecipients, self.fromAddress)
}
return nil
}
func (self *Session) Reset() {
self.fromAddress = ""
self.toAddresses = nil
}
func (self *Session) Logout() error {
return nil
}
func deliverToLocalMailbox(mailbox *mailModel.Mailbox, parsedEmail *email.ParsedEmail, rawMessage []byte) error {
inboxFolder := mailRepo.FindFolderBySlug(mailbox.ID, "inbox")
if inboxFolder == nil {
return errors.Error("Inbox folder not found for mailbox %s.", mailbox.Address)
}
filename := fmt.Sprintf("%d", time.Now().UnixNano())
toAddressesJoined := strings.Join(parsedEmail.ToAddresses, ", ")
ccAddressesJoined := strings.Join(parsedEmail.CcAddresses, ", ")
bccAddressesJoined := strings.Join(parsedEmail.BccAddresses, ", ")
attachmentCount := 0
inlineCount := 0
for _, attachment := range parsedEmail.Attachments {
if attachment.IsInline {
inlineCount++
} else {
attachmentCount++
}
}
emailRecord := &mailModel.Email{
MailboxID: mailbox.ID,
FolderID: inboxFolder.ID,
MessageID: parsedEmail.MessageID,
Filename: filename,
FromAddress: parsedEmail.FromAddress,
FromName: parsedEmail.FromName,
ToAddresses: toAddressesJoined,
CcAddresses: ccAddressesJoined,
BccAddresses: bccAddressesJoined,
ReplyToAddress: parsedEmail.ReplyToAddress,
ReturnPath: parsedEmail.ReturnPath,
Subject: parsedEmail.Subject,
Snippet: parsedEmail.Snippet,
Size: parsedEmail.Size,
IsRead: false,
AttachmentCount: attachmentCount,
InlineCount: inlineCount,
}
if createError := mailRepo.CreateEmail(emailRecord); createError != nil {
return createError
}
for _, parsedAttachment := range parsedEmail.Attachments {
attachmentRecord := &mailModel.Attachment{
EmailID: emailRecord.ID,
Filename: parsedAttachment.Filename,
ContentType: parsedAttachment.ContentType,
ContentID: parsedAttachment.ContentID,
Size: parsedAttachment.Size,
IsInline: parsedAttachment.IsInline,
}
mailRepo.CreateAttachment(attachmentRecord)
}
if writeError := storage.WriteMailFile(mailbox.Address, "inbox", filename, rawMessage); writeError != nil {
logger.Warnf(LogPrefix, MessageStoreFailed, writeError)
}
return nil
}
func extractDomain(emailAddress string) string {
atIndex := strings.LastIndex(emailAddress, "@")
if atIndex < 0 || atIndex >= len(emailAddress)-1 {
return ""
}
return emailAddress[atIndex+1:]
}
func domainHasMXRecords(domainName string) bool {
mxRecords, lookupError := net.LookupMX(domainName)
if lookupError != nil {
logger.Debugf(LogPrefix, MXLookupFailed, domainName, lookupError)
return false
}
return len(mxRecords) > 0
}
|
