isAuthenticated Directive

isAuthenticated.js

import { SchemaDirectiveVisitor } from 'graphql-tools'

export function authenticate(resolver, { strict = true } = {}) {
  return async (source, args, context, info) => {
    const { req } = context
    const token = getTokenFromReq(req)
    try {
      const currentUser = await context.loadUserFromToken(token)
      context.currentUser = currentUser
      context.authToken = token
    } catch(error) {
      if (strict) throw new Error('You are not authorized to access this resource.')
    }
    return resolver(source, args, context, info)
  }
}

export default class AuthDirective extends SchemaDirectiveVisitor {
  visitFieldDefinition(field) {
    if (field.resolve) {
      // this.args contains the arguments passed to the directive.
      field.resolve = authenticate(field.resolve, this.args)
      // Update the description with emoji!
      field.description = `🔑 ${field.description || ''}`
    }
  }
}