vnext/server/middleware/webfinger.js


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import config from 'config'
import addrparser from 'address-rfc2822'

import { getUserByName } from '../db/Users'

const baseUrl = config.get('service.baseURL')

/**
 * WebFinger endpoint
 * @type {import('express').RequestParamHandler}
 */
export const webfinger = async (req, res) => {
    const resource = req.query.resource
    if (resource) {
        const acct = resource.substring(5) // drop "acct:"
        const addresses = parseAddress(acct)
        if (addresses && addresses.length == 1) {
            const address = addresses[0]
            const ourAddress = new URL(baseUrl)
            if (address.host() === ourAddress.hostname) {
                const user = await getUserByName(addresses[0].user())
                if (user) {
                    return res.json({
                        subject: resource,
                        links: [
                            {
                                rel: 'self',
                                type: 'application/activity+json',
                                href: `${baseUrl}/u/${user.nick}`
                            }
                        ]
                    })
                } else {
                    return res.status(404).send('User not found')
                }
            } else {
                return res.status(404).send('Address not found')
            }
        } else {
            return res.status(400).send('Invalid resource')
        }
    }
    res.status(400).send('Missing `resource` param')
}

const parseAddress = (address = '') => {
    try {
        return addrparser.parse(address, { startAt: 'address' })
    } catch {
        return undefined
    }
}