GetUserContext extract UserContext from gin.Context.

NewGinAuthMiddleware creates a new Gin middleware to authorize each request via Authorization header in format "BEARER JWT_TOKEN" where JWT_TOKEN is the keycloak auth token.

NewKeycloakAuthorizer creates a new authorizer that checks if issuer is correct keycloak instance and realm and validates JWT signature with public cert from keycloak.

SetUserContext adds provided UserContext to gin.Context.

KeycloakAuthorizer is used to validate if JWT has a correct signature and is valid and returns keycloak claims.

KeycloakRealmInfo provides keycloak realm and server information.

UserContext contains parsed claims from a keycloak JWT token.