Spring Boot starter library for multi-tenant OAuth2 resource servers

This is a starter library for multi-tenant OAuth2 resource servers implemented with Spring. The code in this project is based on the samples from the official Spring Security documentation.

Installation

Add the dependency to your pom.xml file:

<dependency>
    <groupId>io.quantics</groupId>
    <artifactId>multitenant-oauth2-spring-boot-starter</artifactId>
    <version>0.4.0</version>
</dependency>

Usage

The auto-configuration for a multi-tenant OAuth2 resource server can be activated by adding the property spring.security.oauth2.resourceserver.multitenant.enabled=true to your application properties.

Configuration

All configuration properties start with the prefix spring.security.oauth2.resourceserver.multitenant.*

Key	Allowed values	Default value
`enabled`	`true` `false`	`false`
`resolve-mode`	`jwt` `header`	`jwt`
`jwt.authorities-converter`	Any class extending `AbstractJwtGrantedAuthoritiesConverter`	none
`header.header-name`	Any string	X-TENANT-ID

Resolving the tenant

By JWT

Setting the resolve mode to JWT will resolve the tenant by the OAuth2 iss claim found in the JWT.

By request header

Alternatively, the tenant can be resolved by a custom HTTP header by setting the resolve mode to header.

Note: Resolving the tenant by an HTTP header is not suggested for production-grade applications, but rather for quick validation that things are working as expected.