khezen / tarpit

http tarpit middleware

tarpit

• simple HTTP middleware that purposely delays incoming request
• repeted requests to a given resource increase the delay
• enable TCP keep alive to keep the client from timing out

One typical use case is to protect authentication from brute force.

example

The following example applies tarpit based on IP address. It is possible to apply tarpit based on any data provided in the request.

package main

import (
    "net/http"
    "github.com/khezen/tarpit"
)

var tarpitMiddleware = tarpit.New(tarpit.DefaultFreeReqCount, tarpit.DefaultDelay, tarpit.DefaultResetPeriod)

func handleGetMedicine(w http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodGet{
         w.WriteHeader(http.StatusMethodNotAllowed)
         return
    }
    ipAddr := r.Header.Get("X-Forwarded-For")
    err := tarpitMiddleware.Tar(ipAddr, w, r)
    if err != nil {
        w.WriteHeader(http.StatusInternalServerError)
        w.Write([]byte(err.Error()))
        return
    }
    w.Write([]byte("Here is your medicine"))
}

func main() {
    http.HandleFunc("/drugs-store/v1/medicine", handleGetMedicine)
    writeTimeout := 30*time.Second
    err := tarpit.ListenAndServe(":80", nil, writeTimeout)
    if err != nil {
        panic(err)
    }
}