Auth takes a logger and an api token and return a middleware function that satisfies the gorilla middleware interface.

CORS adds the CORS headers to every response.

Logger is a gorilla/mux middleware to add log to the API.

ResponseWriterWrapper is supposed to capture statusCode from ResponseWriter.

TokenHeader defines the http header that includes the auth token.

LoggingResponseWriter will encapsulate a standard ResponseWriter with a copy of its statusCode.