Merge pull request #47 from zabawaba99/inline-keyboard-button

Adding support for inline keyboard buttons

api.go

@@ -111,8 +111,9 @@ func embedSendOptions(params *url.Values, options *SendOptions) {
 	{
 		forceReply := options.ReplyMarkup.ForceReply
 		customKeyboard := (options.ReplyMarkup.CustomKeyboard != nil)
+		inlineKeyboard := options.ReplyMarkup.InlineKeyboard != nil
 		hiddenKeyboard := options.ReplyMarkup.HideCustomKeyboard
-		if forceReply || customKeyboard || hiddenKeyboard {
+		if forceReply || customKeyboard || hiddenKeyboard || inlineKeyboard {
 			replyMarkup, _ := json.Marshal(options.ReplyMarkup)
 			params.Set("reply_markup", string(replyMarkup))
 		}

bot.go

@@ -11,10 +11,11 @@ import (
 
 // Bot represents a separate Telegram bot instance.
 type Bot struct {
-	Token    string
-	Identity User
-	Messages chan Message
-	Queries  chan Query
+	Token     string
+	Identity  User
+	Messages  chan Message
+	Queries   chan Query
+	Callbacks chan Callback
 }
 
 // NewBot does try to build a Bot with token `token`, which
@@ -34,18 +35,19 @@ func NewBot(token string) (*Bot, error) {
 // Listen periodically looks for updates and delivers new messages
 // to the subscription channel.
 func (b *Bot) Listen(subscription chan Message, timeout time.Duration) {
-	go b.poll(subscription, nil, timeout)
+	go b.poll(subscription, nil, nil, timeout)
 }
 
 // Start periodically polls messages and/or updates to corresponding channels
 // from the bot object.
 func (b *Bot) Start(timeout time.Duration) {
-	b.poll(b.Messages, b.Queries, timeout)
+	b.poll(b.Messages, b.Queries, b.Callbacks, timeout)
 }
 
 func (b *Bot) poll(
 	messages chan Message,
 	queries chan Query,
+	callbacks chan Callback,
 	timeout time.Duration,
 ) {
 	latestUpdate := 0
@@ -62,18 +64,24 @@ func (b *Bot) poll(
 		}
 
 		for _, update := range updates {
-			if update.Query == nil /* if message */ {
+			if update.Payload != nil /* if message */ {
 				if messages == nil {
 					continue
 				}
 
-				messages <- update.Payload
-			} else /* if query */ {
+				messages <- *update.Payload
+			} else if update.Query != nil /* if query */ {
 				if queries == nil {
 					continue
 				}
 
 				queries <- *update.Query
+			} else if update.Callback != nil {
+				if callbacks == nil {
+					continue
+				}
+
+				callbacks <- *update.Callback
 			}
 
 			latestUpdate = update.ID

options.go

@@ -40,6 +40,9 @@ type ReplyMarkup struct {
 	//
 	// Note: you don't need to set HideCustomKeyboard field to show custom keyboard.
 	CustomKeyboard [][]string `json:"keyboard,omitempty"`
+
+	InlineKeyboard [][]KeyboardButton `json:"inline_keyboard,omitempty"`
+
 	// Requests clients to resize the keyboard vertically for optimal fit
 	// (e.g., make the keyboard smaller if there are just two rows of buttons).
 	// Defaults to false, in which case the custom keyboard is always of the

types.go

@@ -54,11 +54,12 @@ func (c Chat) IsGroupChat() bool {
 
 // Update object represents an incoming update.
 type Update struct {
-	ID      int     `json:"update_id"`
-	Payload Message `json:"message"`
+	ID      int      `json:"update_id"`
+	Payload *Message `json:"message"`
 
 	// optional
-	Query *Query `json:"inline_query"`
+	Callback *Callback `json:"callback_query"`
+	Query    *Query    `json:"inline_query"`
 }
 
 // Thumbnail object represents an image/sticker of a particular size.
@@ -129,6 +130,14 @@ type Video struct {
 	Preview Thumbnail `json:"thumb"`
 }
 
+// KeyboardButton represents a button displayed on in a message.
+type KeyboardButton struct {
+	Text        string `json:"text"`
+	URL         string `json:"url,omitempty"`
+	Data        string `json:"callback_data,omitempty"`
+	InlineQuery string `json:"switch_inline_query,omitempty"`
+}
+
 // Contact object represents a contact to Telegram user
 type Contact struct {
 	UserID      int    `json:"user_id"`
@@ -142,3 +151,21 @@ type Location struct {
 	Longitude float32 `json:"longitude"`
 	Latitude  float32 `json:"latitude"`
 }
+
+// Callback object represents a query from a callback button in an
+// inline keyboard.
+type Callback struct {
+	ID string `json:"id"`
+
+	// For message sent to channels, Sender may be empty
+	Sender User `json:"from"`
+
+	// Message will be set if the button that originated the query
+	// was attached to a message sent by a bot.
+	Message Message `json:"message"`
+
+	// MessageID will be set if the button was attached to a message
+	// sent via the bot in inline mode.
+	MessageID string `json:"inline_message_id"`
+	Data      string `json:"data"`
+}