ExtractToken knows how to extract an authentication token from the Authorization header of a *gin.Context.

FetchDiscoveryDocument extracts necessary information for token validation from a discovery endpoint.

IntrospectionMiddleware validates the authorization header token using an introspection endpoint.

JWTValidationMiddleware validates authorization header bearer JWT tokens and adds a "user" to the *gin.Context.

ValidateToken validates a raw JWT token based on provider data.