Fix editMedia and add editCaption

command.go

@@ -51,6 +51,9 @@ const (
 	// CmdAnswerCallback requests the broker to reply to a incoming callback query
 	CmdAnswerCallback ClientCommandType = "answerCallback"
 
+	// CmdEditCaption requests to broker to replace the caption of a media (photo, doc, etc) message
+	CmdEditCaption ClientCommandType = "editCaption"
+
 	// CmdEditMedia requests to broker to replace the media contents of a message
 	CmdEditMedia ClientCommandType = "editMedia"
 )
@@ -102,6 +105,15 @@ type ClientAlbumData struct {
 	ReplyID *int64 `json:",omitempty"`
 }
 
+// ClientEditCaptionData is the required data for a CmdEditCaption request
+type ClientEditCaptionData struct {
+	ChatID      int64
+	MessageID   int64
+	InlineID    string
+	Caption     string
+	ReplyMarkup interface{} `json:",omitempty"`
+}
+
 // ClientEditMediaData is the required data for a CmdEditMedia request
 type ClientEditMediaData struct {
 	ChatID      int64

telegram.go

@@ -213,11 +213,38 @@ func (t Telegram) AnswerCallback(data ClientCallbackQueryData) {
 	checkerr("AnswerCallback/http.PostForm", err)
 }
 
+// EditCaption modifies the caption of a photo/document/etc message
+func (t Telegram) EditCaption(data ClientEditCaptionData) error {
+	postdata := url.Values{
+		"caption":    {data.Caption},
+		"parse_mode": {"HTML"},
+	}
+	if data.InlineID != "" {
+		postdata.Set("inline_message_id", data.InlineID)
+	} else {
+		postdata.Set("chat_id", strconv.FormatInt(data.ChatID, 10))
+		postdata.Set("message_id", strconv.FormatInt(data.MessageID, 10))
+	}
+	if data.ReplyMarkup != nil {
+		replyjson, err := json.Marshal(data.ReplyMarkup)
+		if checkerr("EditCaption/json.Marshal", err) {
+			return ErrMalformed
+		}
+		postdata["reply_markup"] = []string{string(replyjson)}
+	}
+
+	_, err := http.PostForm(t.apiURL("editMessageCaption"), postdata)
+	checkerr("EditCaption/http.PostForm", err)
+
+	return nil
+}
+
 // EditMedia modifies the media content (like photo) of a message
-func (t Telegram) EditMedia(data ClientEditMediaData) {
+func (t Telegram) EditMedia(data ClientEditMediaData) error {
 	jsonmedia, err := json.Marshal(data.Media)
 	if err != nil {
-		checkerr("SendAlbum/json.Marshal", err)
+		checkerr("EditMedia/json.Marshal", err)
+		return ErrMalformed
 	}
 	postdata := url.Values{
 		"media": {string(jsonmedia)},
@@ -230,14 +257,16 @@ func (t Telegram) EditMedia(data ClientEditMediaData) {
 	}
 	if data.ReplyMarkup != nil {
 		replyjson, err := json.Marshal(data.ReplyMarkup)
-		if !checkerr("SendTextMessage/json.Marshal", err) {
-			return
+		if checkerr("EditMedia/json.Marshal", err) {
+			return ErrMalformed
 		}
 		postdata["reply_markup"] = []string{string(replyjson)}
 	}
 
 	_, err = http.PostForm(t.apiURL("editMessageMedia"), postdata)
 	checkerr("EditMedia/http.PostForm", err)
+
+	return nil
 }
 
 // AnswerInlineQuery replies to an inline query