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payment-pointer-discovery.mjs

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/**

* @module payment-pointer-discovery

import express from 'express'

import { promisify } from 'util'

import fs from 'fs'

import rdf from 'rdflib'

const PROFILE_PATH = '/profile/card'

/**

* Returns a set of routes to deal with server payment pointer discovery

* @method paymentPointerDiscovery

* @return {Router} Express router

export default function paymentPointerDiscovery () {

const router = express.Router('/')

// Advertise the server payment pointer discover endpoint

router.get('/.well-known/pay', paymentPointerDocument())

return router

}

/**

* Serves the service payment pointer document (containing server root URL, including

* any base path the user specified in config, server API endpoints, etc).

* @method paymentPointerDocument

* @param req

* @param res

* @param next

function paymentPointerDocument () {

return async (req, res) => {

try {

const ldp = req.app.locals.ldp

const url = ldp.resourceMapper.resolveUrl(req.hostname, PROFILE_PATH)

const contentType = 'text/turtle'

const createIfNotExists = false

const { path } = await ldp.resourceMapper.mapUrlToFile({ url, contentType, createIfNotExists })

let body

try {

// Read the file from disk

body = await promisify(fs.readFile)(path, { encoding: 'utf8' })

} catch (e) {

if (e.message.startsWith('ENOENT: no such file or directory,')) {

res.json({

error: `Please create ${PROFILE_PATH} on your pod`

})

}

const webid = rdf.Namespace(`${url}#`)('me')

const pp = rdf.Namespace('http://paymentpointers.org/ns#')('PaymentPointer')

let paymentPointer

try {

const graph = rdf.graph()

// Parse the file as Turtle

rdf.parse(body, graph, url, contentType)

paymentPointer = graph.any(webid, pp)

} catch (e) {

console.error(e)

res.json({

error: `Please make sure ${PROFILE_PATH} contains valid Turtle`

})

}

if (paymentPointer === null) {

res.json({ fail: 'Add triple', subject: `<${webid.value}>`, predicate: `<${pp.value}>`, object: '$alice.example' })

}

if (paymentPointer.value.startsWith('$')) {

let suffix = ''

if (paymentPointer.value.indexOf('/') === -1) {

suffix = '/.well-known/pay'

}

paymentPointer.value = `https://${paymentPointer.value.substring(1)}${suffix}`

}

res.redirect(paymentPointer.value)

} catch (e) {

res.json({ fail: e.message })

}