Add additional sender helpers (#150)

ext/context.go

@@ -65,11 +65,7 @@ func NewContext(update *gotgbot.Update, data map[string]interface{}) *Context {
 	case update.MessageReaction != nil:
 		user = update.MessageReaction.User
 		chat = &update.MessageReaction.Chat
-		sender = &gotgbot.Sender{
-			User:   update.MessageReaction.User,
-			Chat:   update.MessageReaction.ActorChat,
-			ChatId: update.MessageReaction.Chat.Id,
-		}
+		sender = update.MessageReaction.GetSender()
 
 	case update.MessageReactionCount != nil:
 		chat = &update.MessageReactionCount.Chat
@@ -110,7 +106,7 @@ func NewContext(update *gotgbot.Update, data map[string]interface{}) *Context {
 
 	case update.PollAnswer != nil:
 		user = update.PollAnswer.User
-		sender = &gotgbot.Sender{User: update.PollAnswer.User, Chat: update.PollAnswer.VoterChat}
+		sender = update.PollAnswer.GetSender()
 
 	case update.MyChatMember != nil:
 		user = &update.MyChatMember.From

ext/handlers/filters/types.go

@@ -13,5 +13,5 @@ type (
 	PollAnswer         func(pa *gotgbot.PollAnswer) bool
 	PreCheckoutQuery   func(pcq *gotgbot.PreCheckoutQuery) bool
 	ShippingQuery      func(sq *gotgbot.ShippingQuery) bool
-	Reaction           func(mra *gotgbot.MessageReactionUpdated) bool
+	Reaction           func(mru *gotgbot.MessageReactionUpdated) bool
 )

sender.go

@@ -28,6 +28,23 @@ func (m Message) GetSender() *Sender {
 	}
 }
 
+// GetSender populates the relevant fields of a Sender struct given a reaction.
+func (mru MessageReactionUpdated) GetSender() *Sender {
+	return &Sender{
+		User:   mru.User,
+		Chat:   mru.ActorChat,
+		ChatId: mru.Chat.Id,
+	}
+}
+
+// GetSender populates the relevant fields of a Sender struct given a poll answer.
+func (pa PollAnswer) GetSender() *Sender {
+	return &Sender{
+		User: pa.User,
+		Chat: pa.VoterChat,
+	}
+}
+
 // Id determines the sender ID.
 // When a message is being sent by a chat/channel, telegram usually populates the User field with dummy values.
 // For this reason, we prefer to return the Chat.Id if it is available, rather than a dummy User.Id.