2017-12-02 17:23:06 +02:00
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package smtp
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"github.com/emersion/go-message/mail"
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"github.com/emersion/go-smtp"
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"golang.org/x/crypto/openpgp"
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"github.com/emersion/hydroxide/auth"
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"github.com/emersion/hydroxide/protonmail"
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)
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func toPMAddressList(addresses []*mail.Address) []*protonmail.MessageAddress {
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l := make([]*protonmail.MessageAddress, len(addresses))
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for i, addr := range addresses {
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l[i] = &protonmail.MessageAddress{
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Name: addr.Name,
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Address: addr.Address,
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}
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}
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return l
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}
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func formatHeader(h mail.Header) string {
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var b bytes.Buffer
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for k, values := range h.Header {
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for _, v := range values {
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b.WriteString(fmt.Sprintf("%s: %s\r\n", k, v))
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}
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}
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return b.String()
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}
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type user struct {
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c *protonmail.Client
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u *protonmail.User
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privateKeys openpgp.EntityList
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}
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func (u *user) Send(from string, to []string, r io.Reader) error {
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mr, err := mail.CreateReader(r)
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if err != nil {
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return err
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}
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subject, _ := mr.Header.Subject()
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fromList, _ := mr.Header.AddressList("From")
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toList, _ := mr.Header.AddressList("To")
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ccList, _ := mr.Header.AddressList("Cc")
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bccList, _ := mr.Header.AddressList("Bcc")
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if len(fromList) != 1 {
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return errors.New("the From field must contain exactly one address")
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}
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if len(toList) == 0 && len(ccList) == 0 && len(bccList) == 0 {
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return errors.New("no recipient specified")
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}
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fromAddrStr := fromList[0].Address
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var fromAddr *protonmail.Address
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for _, addr := range u.u.Addresses {
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if addr.Email == fromAddrStr {
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fromAddr = addr
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break
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}
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}
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if fromAddr == nil {
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return errors.New("unknown sender address")
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}
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2017-12-02 17:44:15 +02:00
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if len(fromAddr.Keys) == 0 {
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return errors.New("sender address has no private key")
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}
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// TODO: get appropriate private key
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encryptedPrivateKey, err := fromAddr.Keys[0].Entity()
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if err != nil {
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return fmt.Errorf("cannot parse sender private key: %v", err)
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}
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var privateKey *openpgp.Entity
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for _, e := range u.privateKeys {
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if e.PrimaryKey.KeyId == encryptedPrivateKey.PrimaryKey.KeyId {
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privateKey = e
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break
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}
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}
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if privateKey == nil {
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return errors.New("sender address key hasn't been decrypted")
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}
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2017-12-02 17:23:06 +02:00
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msg := &protonmail.Message{
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ToList: toPMAddressList(toList),
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CCList: toPMAddressList(ccList),
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BCCList: toPMAddressList(bccList),
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Subject: subject,
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Header: formatHeader(mr.Header),
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AddressID: fromAddr.ID,
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}
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var body *bytes.Buffer
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var bodyType string
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for {
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p, err := mr.NextPart()
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if err == io.EOF {
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break
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} else if err != nil {
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return err
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}
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switch h := p.Header.(type) {
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case mail.TextHeader:
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t, _, err := h.ContentType()
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if err != nil {
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break
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}
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if body != nil && t != "text/html" {
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break
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}
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body = &bytes.Buffer{}
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bodyType = t
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if _, err := io.Copy(body, p.Body); err != nil {
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return err
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}
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case mail.AttachmentHeader:
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// TODO
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}
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}
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if body == nil {
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return errors.New("message doesn't contain a body part")
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}
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msg.MIMEType = bodyType
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plaintext, err := msg.Encrypt([]*openpgp.Entity{privateKey}, privateKey)
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if err != nil {
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return err
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}
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if _, err := io.Copy(plaintext, bytes.NewReader(body.Bytes())); err != nil {
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return err
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}
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if err := plaintext.Close(); err != nil {
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return err
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}
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// TODO: parentID from In-Reply-To
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msg, err = u.c.CreateDraftMessage(msg, "")
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if err != nil {
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return fmt.Errorf("cannot create draft message: %v", err)
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}
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outgoing := &protonmail.OutgoingMessage{ID: msg.ID}
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recipients := make([]*mail.Address, 0, len(toList) + len(ccList) + len(bccList))
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recipients = append(recipients, toList...)
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recipients = append(recipients, ccList...)
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recipients = append(recipients, bccList...)
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var plaintextRecipients []string
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encryptedRecipients := make(map[string]*openpgp.Entity)
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for _, rcpt := range recipients {
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resp, err := u.c.GetPublicKeys(rcpt.Address)
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if err != nil {
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return fmt.Errorf("cannot get public key for address %q: %v", rcpt.Address, err)
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}
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if len(resp.Keys) == 0 {
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plaintextRecipients = append(plaintextRecipients, rcpt.Address)
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break
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}
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// TODO: only keys with Send == 1
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pub, err := resp.Keys[0].Entity()
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if err != nil {
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return err
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}
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encryptedRecipients[rcpt.Address] = pub
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}
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if len(plaintextRecipients) > 0 {
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plaintextSet := protonmail.NewMessagePackageSet(nil)
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plaintext, err := plaintextSet.Encrypt(bodyType)
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if err != nil {
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return err
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}
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if _, err := io.Copy(plaintext, bytes.NewReader(body.Bytes())); err != nil {
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plaintext.Close()
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return err
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}
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if err := plaintext.Close(); err != nil {
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return err
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}
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for _, rcpt := range plaintextRecipients {
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if err := plaintextSet.AddCleartext(rcpt); err != nil {
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return err
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}
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}
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outgoing.Packages = append(outgoing.Packages, plaintextSet)
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}
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if len(encryptedRecipients) > 0 {
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// TODO
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}
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_, _, err = u.c.SendMessage(outgoing)
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if err != nil {
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return fmt.Errorf("cannot send message: %v", err)
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}
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return nil
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}
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func (u *user) Logout() error {
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u.c = nil
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u.privateKeys = nil
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return nil
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}
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type backend struct {
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sessions *auth.Manager
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}
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func (be *backend) Login(username, password string) (smtp.User, error) {
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c, privateKeys, err := be.sessions.Auth(username, password)
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if err != nil {
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return nil, err
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}
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u, err := c.GetCurrentUser()
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if err != nil {
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return nil, err
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}
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2017-12-02 17:44:15 +02:00
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// TODO: decrypt private keys in u.Addresses
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2017-12-02 17:23:06 +02:00
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return &user{c, u, privateKeys}, nil
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}
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func New(sessions *auth.Manager) smtp.Backend {
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return &backend{sessions}
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}
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