Serve JSON from /settings/paymentPointer.json

Author: michielbdejong

lib/payment-pointer-discovery.js

@@ -3,9 +3,13 @@
  * @module payment-pointer-discovery
  */
 const express = require('express')
+const { promisify } = require('util')
+const fs = require('fs')
 
 module.exports = paymentPointerDiscovery
 
+const SETTING_FILE_PATH = '/settings/paymentPointer.json'
+
 /**
  * Returns a set of routes to deal with server payment pointer discovery
  * @method paymentPointerDiscovery
@@ -28,9 +32,36 @@ function paymentPointerDiscovery () {
  * @param next
  */
 function paymentPointerDocument () {
-  return (req, res) => {
-    res.json({
-      hello: 'world'
-    })
+  return async (req, res) => {
+    try {
+      const ldp = req.app.locals.ldp
+      const url = ldp.resourceMapper.resolveUrl(req.hostname, SETTING_FILE_PATH)
+      const contentType = 'application/json'
+      const createIfNotExists = true
+      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 ${SETTING_FILE_PATH} on your pod`
+          })
+        }
+      }
+      let obj
+      try {
+        // Read the file from disk
+        obj = JSON.parse(body)
+      } catch (e) {
+        res.json({
+          error: `Please make sure ${SETTING_FILE_PATH} contains valid JSON`
+        })
+      }
+      res.json(obj)
+    } catch (e) {
+      res.json({ fail: e.message })
+    }
   }
 }