Class: AtomicLti::ErrorHandlingMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/atomic_lti/error_handling_middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ ErrorHandlingMiddleware

Returns a new instance of ErrorHandlingMiddleware.



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# File 'lib/atomic_lti/error_handling_middleware.rb', line 3

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/atomic_lti/error_handling_middleware.rb', line 25

def call(env)
  @app.call(env)
rescue JWT::ExpiredSignature
  render_error(401, "The launch has expired. Please launch the application again.")
rescue JWT::DecodeError
  render_error(401, "The launch token is invalid.")
rescue AtomicLti::Exceptions::NoLTIToken
  render_error(401, "Invalid launch. Please launch the application again.")
rescue AtomicLti::Exceptions::AtomicLtiAuthException => e
  render_error(401, "Invalid LTI launch. Please launch the application again. #{e.message}")
rescue AtomicLti::Exceptions::AtomicLtiNotFoundException => e
  render_error(404, e.message)
rescue AtomicLti::Exceptions::AtomicLtiException => e
  render_error(500, "Invalid LTI launch. Please launch the application again. #{e.message}")
end

#render(status, body, format) ⇒ Object 



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# File 'lib/atomic_lti/error_handling_middleware.rb', line 14

def render(status, body, format)
  [
    status,
    {
      "Content-Type" => "#{format}; charset=\"UTF-8\"",
      "Content-Length" => body.bytesize.to_s,
    },
    [body],
  ]
end

#render_error(status, message) ⇒ Object 



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# File 'lib/atomic_lti/error_handling_middleware.rb', line 7

def render_error(status, message)
  format = "text/plain"
  body = message

  render(status, body, format)
end