Add reactions support to handlers (#142)

* Add reactions support.

* Rename FromUserID(also merged with FromAnonymousChatID) to FromPeer, rename FromChatID to ChatID, rename New(Old)ReactionIn to New(Old)ReactionEmoji.

---------

Co-authored-by: Paul Larsen <[email protected]>

ext/handlers/filters/reaction/reaction.go

@@ -0,0 +1,54 @@
+package reaction
+
+import (
+	"github.com/PaulSonOfLars/gotgbot/v2"
+	"github.com/PaulSonOfLars/gotgbot/v2/ext/handlers/filters"
+)
+
+func All(_ *gotgbot.MessageReactionUpdated) bool {
+	return true
+}
+
+func FromPeer(id int64) filters.Reaction {
+	return func(mru *gotgbot.MessageReactionUpdated) bool {
+		if mru.User != nil {
+			return mru.User.Id == id
+		}
+
+		if mru.ActorChat != nil {
+			return mru.ActorChat.Id == id
+		}
+
+		return false
+	}
+}
+
+func ChatID(id int64) filters.Reaction {
+	return func(mru *gotgbot.MessageReactionUpdated) bool {
+		return mru.Chat.Id == id
+	}
+}
+
+func NewReactionEmoji(reaction string) filters.Reaction {
+	return func(mru *gotgbot.MessageReactionUpdated) bool {
+		for _, r := range mru.NewReaction {
+			if r.MergeReactionType().Emoji == reaction {
+				return true
+			}
+		}
+
+		return false
+	}
+}
+
+func OldReactionEmoji(reaction string) filters.Reaction {
+	return func(mru *gotgbot.MessageReactionUpdated) bool {
+		for _, r := range mru.OldReaction {
+			if r.MergeReactionType().Emoji == reaction {
+				return true
+			}
+		}
+
+		return false
+	}
+}

ext/handlers/filters/types.go

@@ -13,4 +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
 )

ext/handlers/reaction.go

@@ -0,0 +1,36 @@
+package handlers
+
+import (
+	"fmt"
+
+	"github.com/PaulSonOfLars/gotgbot/v2"
+	"github.com/PaulSonOfLars/gotgbot/v2/ext"
+	"github.com/PaulSonOfLars/gotgbot/v2/ext/handlers/filters"
+)
+
+type Reaction struct {
+	Filter   filters.Reaction
+	Response Response
+}
+
+func NewReaction(f filters.Reaction, r Response) Reaction {
+	return Reaction{
+		Filter:   f,
+		Response: r,
+	}
+}
+
+func (r Reaction) CheckUpdate(b *gotgbot.Bot, ctx *ext.Context) bool {
+	if ctx.MessageReaction == nil {
+		return false
+	}
+	return r.Filter == nil || r.Filter(ctx.MessageReaction)
+}
+
+func (r Reaction) HandleUpdate(b *gotgbot.Bot, ctx *ext.Context) error {
+	return r.Response(b, ctx)
+}
+
+func (r Reaction) Name() string {
+	return fmt.Sprintf("reaction_%p", r.Response)
+}