Is it possible using the net/http package and/or any of the gorilla libraries to make some code execute on EVERY URL before going to the handler? For example, to check if a connection is coming from a black listed IP address?
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- douzhu1188 2015-01-21 15:40关注
Create a handler that invokes another handler after checking the IP address:
type checker struct { h http.Handler } func (c checker) ServeHTTP(w http.ResponseWriter, r *http.Request) { if blackListed(r.RemoteAddr) { http.Error(w, "not authorized", http.StatusForbidden) return } c.h.ServeHTTP(w, r) }
Pass this handler to ListenAndServe instead of your original handler. For example, if you had:
err := http.ListenAndServe(addr, mux)
change the code to
err := http.ListenAndServe(addr, checker{mux})
This also applies to all the variations of ListenAndServe. It works with http.ServeMux, Gorilla mux and other routers.
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