nginx-to-caddy.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"regexp"
	"strings"
)

func main() {
	files, err := ioutil.ReadDir("./nginx")
	if err != nil {
		log.Fatal(err)
	}
	for _, f := range files {
		filePath := "nginx/" + f.Name()
		dat, err := ioutil.ReadFile(filePath)
		if err != nil {
			fmt.Print(err)
		}
		content := string(dat)
		reServerName := regexp.MustCompile(`server_name[\.\s\w-/:]+`)
		reProxy := regexp.MustCompile(`proxy_pass[\.\s\w-/:]+`)
		host1 := strings.Replace(reServerName.FindString(content), "server_name", "", -1)
		host1 = strings.TrimSpace(host1)
		host2 := strings.ReplaceAll(host1, "old.io", "new.fun")
		proxy := strings.Replace(reProxy.FindString(content), "proxy_pass", "", -1)
		proxy = strings.TrimSpace(proxy)

		caddyTemplate := `
		https://$host1 https://$host2 {
		gzip	
		tls {
			dns dnspod
			wildcard
		}	
		proxy / $proxy {
			transparent
		}
		}
	`
		caddyTemplate = strings.ReplaceAll(caddyTemplate, "$host1", host1)
		caddyTemplate = strings.ReplaceAll(caddyTemplate, "$host2", host2)
		caddyTemplate = strings.ReplaceAll(caddyTemplate, "$proxy", proxy)
		// fmt.Println(caddyTemplate)
		ioutil.WriteFile("output/"+host2, []byte(caddyTemplate), 0644)
	}

}