@treedom/mercurius-auth-opa

Mercurius Auth OPA is a plugin for Mercurius that adds an Authentication and Authorization directive using Open Policy Agent

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Usage

``typescript
import { opaAuthPlugin } from "@treedom/mercurius-auth-opa";
import { opaAuthDirective } from "@treedom/mercurius-auth-opa/opaAuthDirective";

const schema = #graphql
${opaAuthDirective}

type Query {
ping(message: String!): String! @opa(path: "my/opa/policy", options: { ... })
}

app.register(mercurius, {
schema,
resolvers: {
Query: {
ping: (source, args) => args.message,
},
},
})

app.register(opaAuthPlugin, {
opaEndpoint: 'https://my.opa.endpoint',
})
`

OPA policy input

This plugin queries OPA providing the following properties as input

- headers the Fastify headers object
- parent the Mercurius parent object of the field/object which got queried
- args the Mercurius args object of the field/object which got queried
- options static untyped properties defined in the directive arguments _(optional)_

$3

Let's imagine a GraphQL server which accept requests authorized using JWTs containing the role property in their claims.
The following Rego uses a hypotetical oidc.verify_token that validates the JWT signature and returns the token claims
or false if the token is not valid.

`rego
package my.opa.policy

import rego.v1
import data.oidc

default allow := false

allow if {
user := oidc.verify_token(input.headers.authorization)

user
user.role = "admin"
}
`

Custom directive

The authorization directive can be customized registering a custom one in the schema and specifying its name in the plugin configuration

`graphql
scalar OpaOptions
directive @policy(path: String!, options: OpaOptions) on OBJECT | FIELD_DEFINITION
`

`typescript
app.register(opaAuthPlugin, {
// ...
authDirective: 'policy'
})
`

`typescript
app.register(opaAuthPlugin, {
// ...
opaOptions: {
// ...
}
})
``

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Contributing

Contributions are welcome! Please read the contributing guidelines before submitting a pull request.

License

This project is licensed under the MIT License.