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/session/tdesktop_test.go

@@ -0,0 +1,62 @@
+package session
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/crypto"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/session/tdesktop"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/dcs"
+)
+
+func TestTDesktopSession(t *testing.T) {
+	key := crypto.Key{}
+	keyID := key.ID()
+
+	tests := []struct {
+		name    string
+		account tdesktop.Account
+		want    *Data
+		wantErr bool
+	}{
+		{"OK", tdesktop.Account{
+			Authorization: tdesktop.MTPAuthorization{
+				MainDC: 2,
+				Keys: map[int]crypto.Key{
+					2: key,
+				},
+			},
+		}, &Data{
+			DC: 2,
+			Config: Config{
+				ThisDC: 2,
+			},
+			Addr:      findDCAddr(dcs.Prod().Options, 2),
+			AuthKey:   key[:],
+			AuthKeyID: keyID[:],
+		}, false},
+		{"UnknownDC", tdesktop.Account{
+			Authorization: tdesktop.MTPAuthorization{
+				MainDC: 200,
+				Keys: map[int]crypto.Key{
+					200: key,
+				},
+			},
+		}, nil, true},
+		{"NoKey", tdesktop.Account{}, nil, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			a := require.New(t)
+			got, err := TDesktopSession(tt.account)
+			if tt.wantErr {
+				a.Nil(got)
+				a.Error(err)
+			} else {
+				a.Equal(tt.want, got)
+				a.NoError(err)
+			}
+		})
+	}
+}