Initial commit

internal/imapserver/backend.go

@@ -0,0 +1,33 @@
+package imapserver
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/backend"
+	"github.com/neilalexander/yggmail/internal/config"
+	"github.com/neilalexander/yggmail/internal/storage"
+)
+
+type Backend struct {
+	Config  *config.Config
+	Log     *log.Logger
+	Storage storage.Storage
+}
+
+func (b *Backend) Login(_ *imap.ConnInfo, username, password string) (backend.User, error) {
+	if authed, err := b.Storage.TryAuthenticate(username, password); err != nil {
+		b.Log.Printf("Failed to authenticate IMAP user %q due to error: %s", username, err)
+		return nil, fmt.Errorf("failed to authenticate: %w", err)
+	} else if !authed {
+		b.Log.Printf("Failed to authenticate IMAP user %q\n", username)
+		return nil, backend.ErrInvalidCredentials
+	}
+	defer b.Log.Printf("Authenticated IMAP user %q\n", username)
+	user := &User{
+		backend:  b,
+		username: username,
+	}
+	return user, nil
+}