done

go.mod

@@ -0,0 +1,5 @@
+module gogs.inhome.blapointe.com/random-redirect
+
+go 1.18
+
+require golang.org/x/time v0.0.0-20220722155302-e5dcc9cfc0b9

go.sum

@@ -0,0 +1,2 @@
+golang.org/x/time v0.0.0-20220722155302-e5dcc9cfc0b9 h1:ftMN5LMiBFjbzleLqtoBZk7KdJwhuybIU+FckUHgoyQ=
+golang.org/x/time v0.0.0-20220722155302-e5dcc9cfc0b9/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"net/http"
+
+	"golang.org/x/time/rate"
+)
+
+func main() {
+	var port int
+	var conf string
+	flag.IntVar(&port, "p", 8080, "port to listen on")
+	flag.StringVar(&conf, "c", "/dev/null", "line delimited file to read urls from")
+	flag.Parse()
+	b, err := ioutil.ReadFile(conf)
+	if err != nil {
+		panic(err)
+	}
+	links := bytes.Split(b, []byte{'\n'})
+	log.Print(port)
+	limiter := rate.NewLimiter(1, 1)
+	if err := http.ListenAndServe(fmt.Sprintf(":%d", port), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		limiter.Wait(r.Context())
+		link := ""
+		for len(link) == 0 {
+			link = string(links[rand.Intn(len(links))])
+		}
+		http.Redirect(w, r, link, http.StatusTemporaryRedirect)
+	})); err != nil {
+		panic(err)
+	}
+}