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/peers/invite_link.go

@@ -0,0 +1,118 @@
+package peers
+
+import (
+	"context"
+	"time"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// InviteLink represents invite link.
+type InviteLink struct {
+	peer      Peer
+	m         *Manager
+	raw       tg.ChatInviteExported
+	newInvite tg.ChatInviteExported
+}
+
+func (e InviteLinks) inviteLink(raw tg.ChatInviteExported) InviteLink {
+	return InviteLink{
+		peer: e.peer,
+		m:    e.m,
+		raw:  raw,
+	}
+}
+
+func (e InviteLinks) replacedLink(raw, newInvite tg.ChatInviteExported) InviteLink {
+	link := e.inviteLink(raw)
+	link.newInvite = newInvite
+	return link
+}
+
+// ReplacedWith returns new InviteLink, if any.
+func (l InviteLink) ReplacedWith() (InviteLink, bool) {
+	return InviteLink{
+		peer: l.peer,
+		m:    l.m,
+		raw:  l.newInvite,
+	}, !l.newInvite.Zero()
+}
+
+// Raw returns raw tg.ChatInviteExported.
+func (l InviteLink) Raw() *tg.ChatInviteExported {
+	return &l.raw
+}
+
+// Revoked whether this chat invite was revoked
+func (l InviteLink) Revoked() bool {
+	return l.raw.GetRevoked()
+}
+
+// Permanent whether this chat invite has no expiration
+func (l InviteLink) Permanent() bool {
+	return l.raw.GetPermanent()
+}
+
+// RequestNeeded whether users joining the chat via the link need to be approved by chat administrators.
+func (l InviteLink) RequestNeeded() bool {
+	return l.raw.GetRequestNeeded()
+}
+
+// Link returns chat invitation link.
+func (l InviteLink) Link() string {
+	return l.raw.GetLink()
+}
+
+// Creator returns link creator.
+func (l InviteLink) Creator(ctx context.Context) (User, error) {
+	return l.m.GetUser(ctx, &tg.InputUser{
+		UserID: l.raw.AdminID,
+	})
+}
+
+func telegramDate(date int) time.Time {
+	return time.Unix(int64(date), 0)
+}
+
+// CreatedAt returns time when was this chat invite created.
+func (l InviteLink) CreatedAt() time.Time {
+	return telegramDate(l.raw.GetDate())
+}
+
+// StartDate returns time when was this chat invite last modified.
+func (l InviteLink) StartDate() (time.Time, bool) {
+	v, ok := l.raw.GetStartDate()
+	if !ok {
+		return time.Time{}, false
+	}
+	return telegramDate(v), true
+}
+
+// ExpireDate returns time when does this chat invite expire.
+func (l InviteLink) ExpireDate() (time.Time, bool) {
+	v, ok := l.raw.GetExpireDate()
+	if !ok {
+		return time.Time{}, false
+	}
+	return telegramDate(v), true
+}
+
+// UsageLimit returns maximum number of users that can join using this link.
+func (l InviteLink) UsageLimit() (int, bool) {
+	return l.raw.GetUsageLimit()
+}
+
+// Usage returns how many users joined using this link.
+func (l InviteLink) Usage() (int, bool) {
+	return l.raw.GetUsage()
+}
+
+// Requested returns number of pending join requests.
+func (l InviteLink) Requested() (int, bool) {
+	return l.raw.GetRequested()
+}
+
+// Title of this link.
+func (l InviteLink) Title() (string, bool) {
+	return l.raw.GetTitle()
+}