Class: Rack::Firebase::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/firebase/middleware.rb

Constant Summary collapse

USER_UID = 
"firebase.user.uid"

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/rack/firebase/middleware.rb', line 9

def initialize(app)
  @app = app

  @config = ::Rack::Firebase.configuration

  @jwt_loader = FIREBASE_KEY_LOADER
  @error_responder = DEFAULT_ERROR_RESPONDER
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/firebase/middleware.rb', line 18

def call(env)
  path = env.fetch("PATH_INFO", "no-match")
  if config.public_routes.none? { |r| r.match(path) }
    begin
      token = AuthorizationHeader.read_token(env)
      decoded_token = TokenDecoder.new.call(token)

      raise Rack::Firebase::InvalidSubError.new("Invalid subject") if decoded_token["sub"].nil? || decoded_token["sub"] == ""
      raise Rack::Firebase::InvalidAuthTimeError.new("Invalid auth time") unless decoded_token["auth_time"] <= Time.now.to_i

      env[USER_UID] = decoded_token["sub"]
      @app.call(env)
    rescue JWT::JWKError => error # Issues with fetched JWKs
      error_responder.call(error, "unauthorized")
    rescue JWT::ExpiredSignature => error # Token has expired
      error_responder.call(error, "expired")
    rescue JWT::InvalidIatError => error # invalid issued at claim (iat)
      error_responder.call(error, "unauthorized")
    rescue JWT::InvalidIssuerError => error # invalid issuer
      error_responder.call(error, "unauthorized")
    rescue JWT::InvalidAudError => error # invalid audience
      error_responder.call(error, "unauthorized")
    rescue JWT::DecodeError => error # General JWT error
      error_responder.call(error, "unauthorized")
    rescue Rack::Firebase::InvalidSubError => error # subject is empty or missing
      error_responder.call(error, "unauthorized")
    rescue Rack::Firebase::InvalidAuthTimeError => error # auth time is in the future
      error_responder.call(error, "unauthorized")
    end
  else
    @app.call(env)
  end
end