salix/back/methods/chat/sendCheckingPresence.js

const isProduction = require('vn-loopback/server/boot/isProduction');

module.exports = Self => {
    Self.remoteMethodCtx('sendCheckingPresence', {
        description: 'Creates a message in the chat model checking the user status',
        accessType: 'WRITE',
        accepts: [{
            arg: 'workerId',
            type: 'number',
            required: true,
            description: 'The recipient user id'
        },
        {
            arg: 'message',
            type: 'string',
            required: true,
            description: 'The message'
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/sendCheckingPresence`,
            verb: 'POST'
        }
    });

    Self.sendCheckingPresence = async(ctx, recipientId, message) => {
        if (!recipientId) return false;
        const models = Self.app.models;

        const userId = ctx.req.accessToken.userId;
        const sender = await models.VnUser.findById(userId, {fields: ['id']});
        const recipient = await models.VnUser.findById(recipientId, null);

        // Prevent sending messages to yourself
        if (recipientId == userId) return false;
        if (!recipient)
            throw new Error(`Could not send message "${message}" to worker id ${recipientId} from user ${userId}`);

        if (!isProduction())
            message = `[Test:Environment to user ${userId}] ` + message;

        const chat = await models.Chat.create({
            senderFk: sender.id,
            recipient: `@${recipient.name}`,
            dated: Date.vnNew(),
            checkUserStatus: 1,
            message: message,
            status: 'sending',
            attempts: 0
        });

        try {
            await Self.sendCheckingUserStatus(chat);
            await Self.updateChat(chat, 'sent');
        } catch (error) {
            await Self.updateChat(chat, 'error', error);
        }

        return true;
    };
};