mvp

2025-10-19 22:01:49 -06:00 · 2025-10-19 22:01:49 -06:00 · b257da09d4
parent 2cfe3ba909
commit b257da09d4
1 changed files with 46 additions and 0 deletions
--- a/main.go
+++ b/main.go
@ -0,0 +1,46 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+)
+
+func main() {
+	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
+	proxy := fs.String("proxy", "http://10.9.3.1:64932", "addr to proxy to")
+	listen := fs.String("listen", "127.0.0.1:63443", "addr to listen on")
+	if err := fs.Parse(os.Args[1:]); err != nil {
+		log.Fatal(err)
+	}
+
+	u, err := url.Parse(*proxy)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println("listening on", *listen)
+	if err := http.ListenAndServe(*listen, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		p := httputil.NewSingleHostReverseProxy(u)
+		p.ErrorHandler = func(w http.ResponseWriter, r *http.Request, err error) {
+			fmt.Fprintf(w, `
+				<html>
+					<header></header>
+					<body>
+						<h2>The internet is not connected</h2>
+                  <br>
+						<p>%s</p>
+					</body>
+					<footer></footer>
+				</html>
+			`, err.Error())
+		}
+		p.ServeHTTP(w, r)
+	})); err != nil {
+		log.Fatal(err)
+	}
+}