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/telethon_test.go

@@ -0,0 +1,104 @@
+package session
+
+import (
+	"bytes"
+	"encoding/base64"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/crypto"
+)
+
+func repeat(i int) []byte {
+	return bytes.Repeat([]byte{'a'}, i)
+}
+
+var (
+	testKey = repeat(256)
+	ipv4    = append([]byte("\x02\xc0\xa8\x00\x01\x01\xbb"), testKey...)
+	ipv6    = append([]byte("\x02 \x01\r\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xbb"), testKey...)
+)
+
+func TestStringSession(t *testing.T) {
+	var key crypto.Key
+	copy(key[:], testKey)
+	authKey := key.WithID()
+
+	based := func(data []byte) string {
+		return "1" + base64.URLEncoding.EncodeToString(data)
+	}
+
+	tests := []struct {
+		name    string
+		hx      string
+		want    *Data
+		wantErr bool
+	}{
+		{"IPv4", based(ipv4), &Data{
+			DC:        2,
+			Addr:      "192.168.0.1:443",
+			AuthKey:   authKey.Value[:],
+			AuthKeyID: authKey.ID[:],
+		}, false},
+		{"IPv6", based(ipv6),
+			&Data{
+				DC:        2,
+				Addr:      "[2001:db8::]:443",
+				AuthKey:   authKey.Value[:],
+				AuthKeyID: authKey.ID[:],
+			}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Log(tt.hx)
+			got, err := TelethonSession(tt.hx)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.want, got)
+			}
+		})
+	}
+}
+
+func Test_decodeStringSession(t *testing.T) {
+	var key crypto.Key
+	copy(key[:], testKey)
+	authKey := key.WithID()
+
+	tests := []struct {
+		name    string
+		data    []byte
+		want    *Data
+		wantErr bool
+	}{
+		{"TooSmall", repeat(1), nil, true},
+		{"InvalidLength", repeat(267), nil, true},
+		{"TooBig", repeat(276), nil, true},
+		{"IPv4", ipv4, &Data{
+			DC:        2,
+			Addr:      "192.168.0.1:443",
+			AuthKey:   authKey.Value[:],
+			AuthKeyID: authKey.ID[:],
+		}, false},
+		{"IPv6", ipv6, &Data{
+			DC:        2,
+			Addr:      "[2001:db8::]:443",
+			AuthKey:   authKey.Value[:],
+			AuthKeyID: authKey.ID[:],
+		}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := decodeStringSession(tt.data)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.want, got)
+			}
+		})
+	}
+}