5.5. Writing the application

Start by implementing the /{tenant} endpoint. As you can see from the source code below, it is just a regular Jakarta REST resource:

package org.acme.quickstart.oidc;

import jakarta.inject.Inject;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

import org.eclipse.microprofile.jwt.JsonWebToken;

import io.quarkus.oidc.IdToken;

@Path("/{tenant}")
public class HomeResource {
    /**
     * Injection point for the ID Token issued by the OIDC provider.
     */
    @Inject
    @IdToken
    JsonWebToken idToken;

    /**
     * Injection point for the Access Token issued by the OIDC provider.
     */
    @Inject
    JsonWebToken accessToken;

    /**
     * Returns the ID Token info.
     * This endpoint exists only for demonstration purposes.
     * Do not expose this token in a real application.
     *
     * @return ID Token info
     */
    @GET
    @Produces("text/html")
    public String getIdTokenInfo() {
        StringBuilder response = new StringBuilder().append("<html>")
                .append("<body>");

        response.append("<h2>Welcome, ").append(this.idToken.getClaim("email").toString()).append("</h2>\n");
        response.append("<h3>You are accessing the application within tenant <b>").append(idToken.getIssuer()).append(" boundaries</b></h3>");

        return response.append("</body>").append("</html>").toString();
    }

    /**
     * Returns the Access Token info.
     * This endpoint exists only for demonstration purposes.
     * Do not expose this token in a real application.
     *
     * @return Access Token info
     */
    @GET
    @Produces("text/html")
    @Path("bearer")
    public String getAccessTokenInfo() {
        StringBuilder response = new StringBuilder().append("<html>")
                .append("<body>");

        response.append("<h2>Welcome, ").append(this.accessToken.getClaim("email").toString()).append("</h2>\n");
        response.append("<h3>You are accessing the application within tenant <b>").append(accessToken.getIssuer()).append(" boundaries</b></h3>");

        return response.append("</body>").append("</html>").toString();
    }
}

To resolve the tenant from incoming requests and map it to a specific quarkus-oidc tenant configuration in application.properties, create an implementation for the io.quarkus.oidc.TenantConfigResolver interface, which can dynamically resolve tenant configurations:

package org.acme.quickstart.oidc;

import jakarta.enterprise.context.ApplicationScoped;

import org.eclipse.microprofile.config.ConfigProvider;

import io.quarkus.oidc.OidcRequestContext;
import io.quarkus.oidc.OidcTenantConfig;
import io.quarkus.oidc.OidcTenantConfig.ApplicationType;
import io.quarkus.oidc.TenantConfigResolver;
import io.quarkus.oidc.runtime.OidcUtils;
import io.smallrye.mutiny.Uni;
import io.vertx.ext.web.RoutingContext;

@ApplicationScoped
public class CustomTenantResolver implements TenantConfigResolver {

    @Override
    public Uni<OidcTenantConfig> resolve(RoutingContext context, OidcRequestContext<OidcTenantConfig> requestContext) {
        String path = context.request().path();

        if (path.startsWith("/tenant-a")) {
           String keycloakUrl = ConfigProvider.getConfig().getValue("keycloak.url", String.class);

            OidcTenantConfig config = OidcTenantConfig
                    .authServerUrl(keycloakUrl + "/realms/tenant-a")
                    .tenantId("tenant-a")
                    .clientId("multi-tenant-client")
                    .credentials("secret")
                    .applicationType(ApplicationType.HYBRID)
                    .build();
            return Uni.createFrom().item(config);
        } else {
            // resolve to default tenant config
            return Uni.createFrom().nullItem();
        }
    }
}

In the preceding implementation, tenants are resolved from the request path. If no tenant can be inferred, null is returned to indicate that the default tenant configuration should be used.

The tenant-a application type is hybrid; it can accept HTTP bearer tokens if provided. Otherwise, it initiates an authorization code flow when authentication is required.

5.5. Writing the application

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