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/mtp_authorization_test.go

@@ -0,0 +1,54 @@
+package tdesktop
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+func Test_mtpAuthorization_deserialize(t *testing.T) {
+	testData := []uint8{
+		0x00, 0x00, 0x00, 0x4b, // dbiMtpAuthorization
+		0x00, 0x00, 0x05, 0x30, // mainLength
+		0xff, 0xff, 0xff, 0xff, // legacyUserId
+		0xff, 0xff, 0xff, 0xff, // legacyMainDcId
+		0x00, 0x00, 0x00, 0x00, 0x12, 0x73, 0xab, 0x45, // UserID = 309570373
+		0x00, 0x00, 0x00, 0x02, // DC = 2
+		0x00, 0x00, 0x00, 0x05, // 5 keys.
+	}
+	maxCut := len(testData) + 16
+	for i := byte(0); i < 5; i++ {
+		testData = append(testData, 0, 0, 0, i) // DC ID as BigEndian uint32
+		key := bytes.Repeat([]byte{i}, 256)
+		testData = append(testData, key...)
+	}
+
+	t.Run("OK", func(t *testing.T) {
+		a := require.New(t)
+		var m MTPAuthorization
+		a.NoError(m.deserialize(&qtReader{buf: bin.Buffer{Buf: testData}}))
+		a.Equal(uint64(309570373), m.UserID)
+		a.Equal(2, m.MainDC)
+		a.Len(m.Keys, 5)
+		for i := 0; i < 5; i++ {
+			a.Equal(m.Keys[i][0], uint8(i))
+		}
+	})
+	t.Run("WrongID", func(t *testing.T) {
+		a := require.New(t)
+		var m MTPAuthorization
+		a.Error(m.deserialize(&qtReader{buf: bin.Buffer{Buf: make([]byte, 4)}}))
+	})
+
+	for i := 0; i < maxCut; i += 4 {
+		t.Run(fmt.Sprintf("EOFAfter%d", i), func(t *testing.T) {
+			a := require.New(t)
+			var m MTPAuthorization
+			a.Error(m.deserialize(&qtReader{buf: bin.Buffer{Buf: testData[:i]}}))
+		})
+	}
+}