local-jwks-server

This project provides a local server that can be used to serve a JSON Web Key Set endpoint for testing purposes. It can be used to test applications that rely on a JWKS endpoint for authentication, for example for mocking the auth0 signature verification.

Running the server

The server can be run using docker:

docker run --rm -d -p 8080:8080 ghcr.io/murar8/local-jwks-server:latest

Docker compose can also be used:

services:
    local-jwks-server:
        image: ghcr.io/murar8/local-jwks-server:latest
        volumes:
            # [OPTIONAL] Must contain a private key in PEM format.
            # If no private key file is provided the server will generate
            # a random key upon startup based on the provided configuration.
            # The server conguration must match the private key format.
            - ./jwks-private-key.pem:/etc/local-jwks-server/key.pem
        ports:
            - 8080:8080
        # [OPTIONAL] Healthcheck command is configured by default.
        healthcheck:
            retries: 10

    my-app:
        build: .
        environment:
            JWKS_ENDPOINT: http://local-jwks-server:8080/.well-known/jwks.json
        depends_on:
            local-jwks-server:
                condition: service_healthy

Usage

Retrieving the JSON Web Key Set

The server exposes a JWKS endpoint at /.well-known/jwks.json that can be used to retrieve a JSON Web Key Set.

Example:

curl http://localhost:8080/.well-known/jwks.json

{
    "keys": [
        {
            "alg": "RS256",
            "e": "AQAB",
            "key_ops": null,
            "kid": "IEff3BluQ9g1FfhnXfnemjW_7nfUBwV-eZdoXPdUjeg",
            "kty": "RSA",
            "n": "v2quwe3LT7bdgtbk0VThV-XUcs0qEeyYqz_CzfHDQLICf7wv-mAyOm3P6QFxKRF35n0Qx5iPjliiw6cOXpMVYHONI_IcTeGunhqx2OTQhNgPOmQytPtaiIRlG5Gu8-y79Gy4rDqt2OSxOAoBMvxlJcBM9wKy8wbeyW8Gkdtpu_fIvJZlgygazzKOQ4gI8roPpxOj5hjupsGjlYWsdAiPUAZxru0aOeBIl2b9qVxTyWLysGkf5XSR03jS3dMD3x1D10uOpAJYqTIw0FXTJTtTf5klAxaD1RNRgqovAd1TOtB-WEwgLH8dkZTC1z7jdccYK1XuRLSFE8YBcJA3gsvIGw",
            "use": "sig"
        }
    ]
}

Generate a signed JWT for testing

The server exposes a /jwt/sign endpoint that can be used to generate a signed JWT for testing purposes. This is useful during development and testing to generate a JWT that can be used to authenticate requests. You must provide the JWT payload as a JSON object in the request body.

Example:

curl -X POST -H "Content-Type: application/json" -d '{ "sub": "lnzmrr@gmail.com" }' http://localhost:8080/jwt/sign

{
    "jwt": "eyJhbGciOiJSUzI1NiIsImtpZCI6IklFZmYzQmx1UTlnMUZmaG5YZm5lbWpXXzduZlVCd1YtZVpkb1hQZFVqZWciLCJ0eXAiOiJKV1QifQ.eyJzdWIiOiJsbnptcnJAZ21haWwuY29tIn0.A0PO4Qbf4AeDMrboOX3rUK17Un3SEIqT10T6Ejky4Y_LxmQMpV8R75wLX52EI67KenLIScncysh5gWkPiXFm3y6XMp3y9HFgWykDuR7pJJ-zbdbqRQ5qxOgms7rKw2y4hjpncyQuoL3z7Gm2GhqSmLXrrARB3J2DnDZdXWlDIMxDA-buLP8Ift06PuIAb8s1qozcouHLNOUNBYyzwPeRiQ4QtUAwl5ewFwAyTlssLMwDvlV3lWMPTWY5bfpfUeYah8zVY7gD_lM5Vi2mPCL89PImSIjH10yRrckNXnDa8Paqp5DuEL8mJ0KBpUF0FRTEdBoO3LPs1OwAkRdzavZ7lQ"
}

Configuration

All configuration is managed via environment variables:

Name	Description	Default
JWK_ALG	RFC7518 JWS Algorithm.	RS256
JWK_KEY_FILE	Private key file path.	/etc/local-jwks-server/key.pem
JWK_RSA_KEY_SIZE	RSA key size.	2048
JWK_KEY_OPS	RFC7517 Key Operations, comma separated.	-
SERVER_ADDR	Server listening address.	0.0.0.0
SERVER_PORT	Server listening port.	8080
SERVER_HTTP_REQ_TIMEOUT	Server HTTP request timeout.	30s

Contributing

The repository comes with a preconfigured development container for VSCode. To use it, simply open the repository in VSCode and click the "Reopen in Container" button.

Installing the pre-commit hooks

pre-commit install

Starting a development server

go run github.com/cosmtrek/air@latest

Running the unit test suite

With docker:

docker compose -f docker-compose.test.yml run --rm --build test-unit

Locally:

go test ./...

Running the e2e test suite

docker compose -f docker-compose.test.yml run --rm --build test-e2e

License

MIT License

Copyright (c) 2023 Lorenzo Murarotto lnzmrr@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.