Add SendDocument method.

api.go

@@ -45,7 +45,7 @@ func NewSendPhotoParams(chatId int64, photo string, options *SendPhotoOptions) *
 type SendAudioOptions struct {
 	Duration            int         `json:"duration,omitempty"`
 	Performer           string      `json:"performer,omitempty"`
-	title               string      `json:"title,omitempty"`
+	Title               string      `json:"title,omitempty"`
 	DisableNotification bool        `json:"disable_notification,omitempty"`
 	ReplyToMessageId    int64       `json:"reply_to_message_id,omitempty"`
 	ReplyMarkup         ReplyMarkup `json:"reply_markup,omitempty"`
@@ -70,6 +70,33 @@ func NewSendAudioParams(chatId int64, audio string, options *SendAudioOptions) *
 	return params
 }
 
+// Send document request params
+type SendDocumentOptions struct {
+	Caption             string      `json:"caption,omitempty"`
+	DisableNotification bool        `json:"disable_notification,omitempty"`
+	ReplyToMessageId    int64       `json:"reply_to_message_id,omitempty"`
+	ReplyMarkup         ReplyMarkup `json:"reply_markup,omitempty"`
+}
+
+type SendDocumentParams struct {
+	ChatId   int64  `json:"chat_id"`
+	Document string `json:"document,omitempty"`
+	SendDocumentOptions
+}
+
+func NewSendDocumentParams(chatId int64, document string, options *SendDocumentOptions) *SendDocumentParams {
+	params := &SendDocumentParams{
+		ChatId:   chatId,
+		Document: document,
+	}
+
+	if options != nil {
+		params.SendDocumentOptions = *options
+	}
+
+	return params
+}
+
 type EditMessageTextOptions struct {
 	ParseMode             ParseMode   `json:"parse_mode,omitempty"`
 	DisableWebPagePreview bool        `json:"disable_web_page_preview,omitempty"`

bot.go

@@ -219,6 +219,36 @@ func (bot *Bot) SendAudioFile(chatId int64, file io.ReadCloser, options *SendAud
 	return message, err
 }
 
+// Send exists document by file_id
+func (bot *Bot) SendDocument(chatId int64, documentId string, options *SendDocumentOptions) (*Message, error) {
+	params := NewSendDocumentParams(chatId, documentId, options)
+
+	message := new(Message)
+	err := bot.post("sendDocument", params, message)
+
+	return message, err
+}
+
+// Send file
+func (bot *Bot) SendDocumentFile(chatId int64, documentName string, file io.ReadCloser, options *SendDocumentOptions) (*Message, error) {
+	params := NewSendDocumentParams(chatId, "", options)
+	values, err := structToValues(params)
+	if err != nil {
+		return nil, err
+	}
+
+	fileToSend := &FileToSend{
+		File:      file,
+		Fieldname: "document",
+		Filename:  documentName,
+	}
+
+	message := new(Message)
+	err = bot.postMultipart("sendDocument", fileToSend, values, message)
+
+	return message, err
+}
+
 // Use this method to forward messages of any kind.
 func (bot *Bot) ForwardMessage(chatId, fromChatId, messageId int64, disableNotification bool) (*Message, error) {
 	params := map[string]interface{}{