Cloud Run golang redirect server

go.mod

module loremipsum.co.jp/redirect

go 1.18

main.go

package main

import (
	"log"
	"net/http"
	"os"
)

func main () {
	location := os.Getenv("LOCATION")

	if location == "" {
		log.Fatal("location == \"\"")
	}

	http.HandleFunc("/", func (w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Location", location)
		w.WriteHeader(http.StatusMovedPermanently)
	})

	port := os.Getenv("PORT")

	if port == "" {
		port = "3000"
	}

	log.Printf("Listening on %s\n", port)
	log.Fatal(http.ListenAndServe(":" + port, nil))
}

makefile

all:

deploy:
	source .env && gcloud run deploy $$SERVICE \
		--source . \
		--region asia-northeast1 \
		--platform managed \
		--allow-unauthenticated

gist:
	source .env && gist -u $$GIST_ID \
		-od "Cloud Run golang redirect server" \
		go.mod main.go makefile