@jvhaile/loopback4-helper/src/auth/middlewares/user-agent.middleware.ts

Helper components and tools for loopback 4.

import {injectable, Provider} from '@loopback/core';
import {asMiddleware, ErrorWriterOptions, Middleware, RestMiddlewareGroups,} from '@loopback/rest';


const expressUserAgent = require('express-useragent');


@injectable(
    asMiddleware({
        group: UserAgentMiddlewareProvider.USER_AGENT,
        downstreamGroups: RestMiddlewareGroups.AUTHENTICATION,
    }),
)

export class UserAgentMiddlewareProvider implements Provider<Middleware> {
    static USER_AGENT = 'userAgent';

    async value() {
        const middleware: Middleware = async (ctx, next) => {
            const userAgent = ctx.request.header('user-agent')
            try { // @ts-ignore
                ctx.request.headers['parsed-user-agent'] = {
                    ...expressUserAgent.parse(userAgent),
                    ips: ctx.request.ips,
                    ip: ctx.request.ip,
                };
            } catch (e) {
            }

            return next();
        };
        return middleware;
    }
}