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package imap
import (
"fmt"
"strings"
"github.com/emersion/go-imap"
imapClient "github.com/emersion/go-imap/client"
"github.com/Necoro/feed2imap-go/internal/log"
)
type Client struct {
c *imapClient.Client
host string
folders folders
delimiter string
toplevel string
}
type folders map[string]*imap.MailboxInfo
func (f folders) contains(elem string) bool {
_, ok := f[elem]
return ok
}
func (f folders) add(elem *imap.MailboxInfo) {
name := elem.Name
f[name] = elem
}
func (client *Client) Disconnect() {
if client != nil {
connected := (client.c.State() & imap.ConnectedState) != 0
_ = client.c.Logout()
if connected {
log.Print("Disconnected from ", client.host)
}
}
}
func (client *Client) FolderName(path []string) string {
return strings.Join(path, client.delimiter)
}
func (client *Client) createFolder(folder string) error {
err := client.c.Create(folder)
if err != nil {
return fmt.Errorf("creating folder '%s': %w", folder, err)
}
err = client.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 (client *Client) list(folder string) (*imap.MailboxInfo, int, error) {
mailboxes := make(chan *imap.MailboxInfo, 10)
done := make(chan error, 1)
go func() {
done <- client.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 (client *Client) selectToplevel() (err error) {
err = client.EnsureFolder(client.toplevel)
if err == nil {
_, err = client.c.Select(client.toplevel, false)
}
return
}
func (client *Client) fetchDelimiter() error {
mbox, _, err := client.list("")
if err != nil {
return err
}
client.delimiter = mbox.Delimiter
return nil
}
func (client *Client) EnsureFolder(folder string) error {
if client.folders.contains(folder) {
return nil
}
log.Printf("Checking for folder '%s'", folder)
mbox, found, err := client.list(folder)
switch {
case err != nil:
return err
case found == 0:
return client.createFolder(folder)
case found == 1:
client.folders.add(mbox)
return nil
default:
return fmt.Errorf("Found multiple folders matching '%s'.", folder)
}
}
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