@envelop/auth0/esm/index.js

This plugin validates an JWT token created by [Auth0](https://auth0.com/), and injects the Auth0 user properties into your GraphQL context. With this plugin, you can implement authentication and authorization in a simple way.

/* eslint-disable no-console */
/* eslint-disable dot-notation */
import jwtPkg from 'jsonwebtoken';
import * as JwksRsa from 'jwks-rsa';
import { handleMaybePromise } from '@whatwg-node/promise-helpers';
const { decode, verify } = jwtPkg;
export class UnauthenticatedError extends Error {
}
export const useAuth0 = (options) => {
    const jkwsClient = new JwksRsa.JwksClient({
        cache: true,
        rateLimit: true,
        jwksRequestsPerMinute: 5,
        jwksUri: `https://${options.domain}/.well-known/jwks.json`,
        ...options.jwksClientOptions,
    });
    const contextField = options.extendContextField || '_auth0';
    const tokenType = options.tokenType || 'Bearer';
    const headerName = options.headerName || 'authorization';
    const extractFn = options.extractTokenFn ||
        ((ctx = {}) => {
            const req = ctx['req'] || ctx['request'] || {};
            const headers = req.headers || ctx['headers'] || null;
            if (!headers) {
                console.warn(`useAuth0 plugin unable to locate your request or headers on the execution context. Please make sure to pass that, or provide custom "extractTokenFn" function.`);
            }
            else {
                let authHeader = null;
                if (headers[headerName] && typeof headers[headerName] === 'string') {
                    authHeader = headers[headerName] || null;
                }
                else if (headers.get && headers.has && headers.has(headerName)) {
                    authHeader = headers.get(headerName) || null;
                }
                if (authHeader === null) {
                    return null;
                }
                const split = authHeader.split(' ');
                if (split.length !== 2) {
                    throw new Error(`Invalid value provided for header "${headerName}"!`);
                }
                else {
                    const [type, value] = split;
                    if (type !== tokenType) {
                        throw new Error(`Unsupported token type provided: "${type}"!`);
                    }
                    else {
                        return value;
                    }
                }
            }
            return null;
        });
    const verifyToken = (token) => {
        const decodedToken = decode(token, { complete: true, ...options.jwtDecodeOptions }) || {};
        if (decodedToken && decodedToken.header && decodedToken.header.kid) {
            return handleMaybePromise(() => jkwsClient.getSigningKey(decodedToken.header.kid), secret => {
                const signingKey = secret.getPublicKey();
                const decoded = verify(token, signingKey, {
                    algorithms: ['RS256'],
                    audience: options.audience,
                    issuer: `https://${options.domain}/`,
                    ...options.jwtVerifyOptions,
                });
                return decoded;
            });
        }
        throw new Error(`Failed to decode authentication token!`);
    };
    return {
        onContextBuilding({ context, extendContext }) {
            return handleMaybePromise(() => extractFn(context), token => {
                if (token) {
                    return handleMaybePromise(() => verifyToken(token), decodedPayload => {
                        extendContext({
                            [contextField]: decodedPayload,
                        });
                    });
                }
                else if (options.preventUnauthenticatedAccess) {
                    throw new UnauthenticatedError(`Unauthenticated!`);
                }
            }, e => {
                if (options.onError) {
                    options.onError(e);
                }
                else {
                    throw e;
                }
            });
        },
    };
};