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package imap
import (
"fmt"
"strings"
"time"
"github.com/emersion/go-imap"
imapClient "github.com/emersion/go-imap/client"
"github.com/Necoro/feed2imap-go/pkg/log"
"github.com/Necoro/feed2imap-go/pkg/util"
)
type connection struct {
*connConf
mailboxes *mailboxes
c *imapClient.Client
}
func (conn *connection) startTls() error {
hasStartTls, err := conn.c.SupportStartTLS()
if err != nil {
return fmt.Errorf("checking for starttls for %s: %w", conn.host, err)
}
if hasStartTls {
if err = conn.c.StartTLS(nil); err != nil {
return fmt.Errorf("enabling starttls for %s: %w", conn.host, err)
}
log.Print("Connected to ", conn.host, " (STARTTLS)")
} else {
log.Print("Connected to ", conn.host, " (Plain)")
}
return nil
}
func (conn *connection) disconnect() bool {
if conn != nil {
connected := (conn.c.State() & imap.ConnectedState) != 0
_ = conn.c.Logout()
return connected
}
return false
}
func (conn *connection) createFolder(folder string) error {
err := conn.c.Create(folder)
if err != nil {
return fmt.Errorf("creating folder '%s': %w", folder, err)
}
err = conn.c.Subscribe(folder)
if err != nil {
return fmt.Errorf("subscribing to folder '%s': %w", folder, err)
}
log.Printf("Created folder '%s'", folder)
return nil
}
func (conn *connection) list(folder string) (*imap.MailboxInfo, int, error) {
mailboxes := make(chan *imap.MailboxInfo, 10)
done := make(chan error, 1)
go func() {
done <- conn.c.List("", folder, mailboxes)
}()
found := 0
var mbox *imap.MailboxInfo
for m := range mailboxes {
if found == 0 {
mbox = m
}
found++
}
if err := <-done; err != nil {
return nil, 0, fmt.Errorf("while listing '%s': %w", folder, err)
}
return mbox, found, nil
}
func (conn *connection) fetchDelimiter() (string, error) {
mbox, _, err := conn.list("")
if err != nil {
return "", err
}
return mbox.Delimiter, nil
}
func (conn *connection) ensureFolder(folder Folder) error {
if conn.mailboxes.contains(folder) {
return nil
}
if conn.mailboxes.locking(folder) {
// someone else tried to create the MB -- try again, now that he's done
return conn.ensureFolder(folder)
} else {
defer conn.mailboxes.unlocking(folder)
}
log.Printf("Checking for folder '%s'", folder)
mbox, found, err := conn.list(folder.str)
if err != nil {
return err
}
if mbox != nil && mbox.Delimiter != folder.delimiter {
panic("Delimiters do not match")
}
switch {
case found == 0 || (found == 1 && util.StrContains(mbox.Attributes, imap.NoSelectAttr)):
return conn.createFolder(folder.str)
case found == 1:
conn.mailboxes.add(mbox)
return nil
default:
return fmt.Errorf("Found multiple folders matching '%s'.", folder)
}
}
func (conn *connection) putMessages(folder Folder, messages []string) error {
if len(messages) == 0 {
return nil
}
now := time.Now()
for _, msg := range messages {
reader := strings.NewReader(msg)
if err := conn.c.Append(folder.str, nil, now, reader); err != nil {
return fmt.Errorf("uploading message to %s: %w", folder, err)
}
}
return nil
}
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