move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/message/peer/resolver.go

@@ -0,0 +1,64 @@
+package peer
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// Resolver is an abstraction to resolve domains and Telegram deeplinks.
+type Resolver interface {
+	ResolveDomain(ctx context.Context, domain string) (tg.InputPeerClass, error)
+	ResolvePhone(ctx context.Context, phone string) (tg.InputPeerClass, error)
+}
+
+// DefaultResolver creates and returns default resolver.
+func DefaultResolver(raw *tg.Client) Resolver {
+	return NewLRUResolver(SingleflightResolver(Plain(raw)), 10)
+}
+
+// Plain creates plain resolver.
+func Plain(raw *tg.Client) Resolver {
+	return plainResolver{raw: raw}
+}
+
+type plainResolver struct {
+	raw *tg.Client
+}
+
+func (p plainResolver) ResolveDomain(ctx context.Context, domain string) (tg.InputPeerClass, error) {
+	peer, err := p.raw.ContactsResolveUsername(ctx, &tg.ContactsResolveUsernameRequest{
+		Username: domain,
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "resolve")
+	}
+
+	return EntitiesFromResult(peer).ExtractPeer(peer.Peer)
+}
+
+func (p plainResolver) ResolvePhone(ctx context.Context, phone string) (tg.InputPeerClass, error) {
+	r, err := p.raw.ContactsGetContacts(ctx, 0)
+	if err != nil {
+		return nil, errors.Wrap(err, "get contacts")
+	}
+
+	switch c := r.(type) {
+	case *tg.ContactsContacts:
+		for _, u := range c.Users {
+			user, ok := u.AsNotEmpty()
+			if !ok {
+				continue
+			}
+			if user.Phone == phone {
+				return user.AsInputPeer(), nil
+			}
+		}
+
+		return nil, errors.Errorf("can't resolve phone %q", phone)
+	default:
+		return nil, errors.Errorf("unexpected type %T", r)
+	}
+}