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rdf-express-node-factory

v2.0.0

Published

Express middleware which sets up an RDF/JS factory creating named nodes relative to the request URL

Downloads

18

Readme

rdf-express-node-factory codecov

Express middleware which sets up an RDF/JS factory creating named nodes relative to the request URL

Why?

An express server application will run on a specific endpoint, configured by the deployment and app configuration. For example, it may be deployed to serve requests to https://my.super.app/ with base path set up as

app.use('/admin', adminApiMiddleware)

This package solves the problem that the individual handler middleware is not aware of the path and hosting environment.

This package removes the need for passing around an environment variable such as BASE_URI and instead constructs absolute URIs automatically into RDF/JS Named Nodes.

Setup

The package exports a single factory function, which returns an express middleware.

There is an optional DataFactory parameter. By default, @rdfjs/data-model is used.

The middleware attaches an RDF/JS DataFactory to the Request object as req.rdf.

Usage

import express from 'express'
import nodeFactory from 'rdf-express-node-factory'

// assuming host is https://example.com
const app = express()

const adminApiMiddleware = express.Router()
    .get('/home', (req, res, next) => {
        // absolute paths resolved to the routing base
        // https://example.com/admin/users
        const usersId = req.rdf.namedNode('/users')
       
        // relative paths resolved against current resource
        // https://example.com/admin/home/dashboard
        const dashboardId = req.rdf.namedNode('dashboard')
        
        // the rest of your code
        next()
    })

app.use(nodeFactory())
app.use('/admin', adminApiMiddleware)