131 lines
3.2 KiB
JavaScript
131 lines
3.2 KiB
JavaScript
import Base from './Base';
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const MSG_MAX_LENGTH = 4096;
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function splitToChunks(str, size) {
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const numChunks = Math.ceil(str.length / size);
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const chunks = new Array(numChunks);
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for (let i = 0, o = 0; i < numChunks; ++i, o += size) {
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chunks[i] = str.substr(o, size);
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}
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return chunks;
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}
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/**
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* Message class, used to send message to a chat
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*/
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export default class Message extends Base {
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/**
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* Create a new message
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* @param {object} properties Message properties, as defined by Telegram API
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*/
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constructor(properties = {}) {
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super('sendMessage');
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this.properties = properties;
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this._keyboard = new Base();
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}
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/**
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* Set chat_id of the message
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* @param {number} chat
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* @return {object} returns the message object
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*/
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to(chat) {
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this.properties.chat_id = chat;
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return this;
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}
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/**
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* Set text of the message
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* @param {string} text Message's content
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* @return {object} returns the message object
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*/
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text(text) {
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this.properties.text = text;
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return this;
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}
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/**
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* Set text of the message in HTML format
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* @param {string} text Message's content in HTML format
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* @return {object} returns the message object
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*/
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html(text) {
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this.properties.parse_mode = 'HTML';
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if (text) {
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this.properties.text = text;
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}
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return this;
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}
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/**
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* Set text of the message in Markdown format
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* @param {string} text Message's content in Markdown format
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* @return {object} returns the message object
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*/
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markdown(text) {
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this.properties.parse_mode = 'Markdown';
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if (text) {
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this.properties.text = text;
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}
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return this;
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}
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/**
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* Set reply_to_message_id of the message
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* @param {number} id message_id of the message to reply to
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* @return {object} returns the message object
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*/
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reply(id) {
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this.properties.reply_to_message_id = id;
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return this;
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}
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/**
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* Set disable_web_page_preview of the message
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* @param {boolean} enable
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* @return {object} returns the message object
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*/
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preview(enable = true) {
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this.properties.disable_web_page_preview = !enable;
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return this;
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}
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/**
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* Sets keyboard of the message
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* The value of reply_markup is set to the sanitized keyboard properties
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* i.e. reply_markup = JSON.stringify(kb.getProperties())
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* @param {object} kb A Keyboard instance
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* @return {object} returns the message object
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*/
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keyboard(kb) {
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this._keyboard = kb;
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return this;
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}
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// override Base.prototype._apiSend() method
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_apiSend(bot) {
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if (this.properties.text && this.properties.text.length > MSG_MAX_LENGTH) {
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let promiseChain = Promise.resolve();
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const textChunks = splitToChunks(this.properties.text, MSG_MAX_LENGTH);
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textChunks.forEach(chunk => {
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const properties = Object.assign({}, this.properties, { text: chunk });
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// any unclosed tags, text modifiers will not send out, send as pure text
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delete properties.parse_mode;
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promiseChain = promiseChain.then(() => bot.api[this.method](properties));
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});
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return promiseChain;
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}
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return bot.api[this.method](this.properties);
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}
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// This class inherits Base's send method
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}
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