RocketChat/Rocket.Chat

import { isE2EEMessage, isOTRMessage, isOTRAckMessage } from '@rocket.chat/core-typings';
import type { IMessage } from '@rocket.chat/core-typings';
import { parse } from '@rocket.chat/message-parser';

type ParserConfig = {
    colors?: boolean;
    emoticons?: boolean;
    customDomains?: string[];
    katex?: {
        dollarSyntax: boolean;
        parenthesisSyntax: boolean;
    };
};

export class BeforeSaveMarkdownParser {
    constructor(private enabled: boolean = true) {
        // no op
    }

    async parseMarkdown({ message, config }: { message: IMessage; config: ParserConfig }): Promise<IMessage> {
        if (!this.enabled) {
            return message;
        }

        if (isE2EEMessage(message) || isOTRMessage(message) || isOTRAckMessage(message)) {
            return message;
        }

        try {
            if (message.msg) {
                message.md = parse(message.msg, config);
            }

            if (message.attachments?.[0]?.description !== undefined) {
                message.attachments[0].descriptionMd = parse(message.attachments[0].description, config);
            }
        } catch (e) {
            console.error(e); // errors logged while the parser is at experimental stage
        }

        return message;
    }
}