How to Retrieve a User\'s IP Address for ReCAPTCHA Verification in Google App Engine Go?

Retrieving User IP Address in Google App Engine Go for ReCAPTCHA Verification

Integrating reCAPTCHA into your GAE Go web application requires capturing the user's IP address for verification purposes. This article explores how to retrieve a user's IP address from a form post in order to facilitate ReCAPTCHA integration.

The key to obtaining the user's IP address lies in using the net.SplitHostPort function. This function takes the r.RemoteAddr variable, which captures the remote address of the incoming request, and splits it into its host and port components. The resulting IP address is stored in the ip variable.

Here's an example of how to implement this in your Go code:

<code class="go">package main

import (
    "log"
    "net"
    "os"

    "github.com/go-martini/martini"
)

func main() {
    m := martini.Classic()

    m.Post("/verify", func(w http.ResponseWriter, r *http.Request) {
        ip, _, _ := net.SplitHostPort(r.RemoteAddr)
        log.Printf("User IP address: %s", ip)
    })

    port := os.Getenv("PORT")
    if port == "" {
        port = "8080"
        log.Printf("Defaulting to port %s", port)
    }

    m.RunOnAddr(":" + port)
}</code>

By implementing this approach, you can effectively retrieve the user's IP address and utilize it for ReCAPTCHA verification in your GAE Go web application.

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