got the certificate request working

certs/certs.go

@@ -1,8 +1,10 @@
 package certs
 
 import (
-	"fmt"
+	"encoding/json"
 	"log"
+	"os"
+	"strings"
 
 	"github.com/go-acme/lego/v4/certificate"
 	"github.com/go-acme/lego/v4/challenge/dns01"
@@ -11,10 +13,17 @@ import (
 )
 
 type certsClient struct {
-	legoClient *lego.Client
+	legoClient      *lego.Client
+	lastCertificate *certificate.Resource
 }
 
 func (c *certsClient) RequestCertificate() {
+	log.Println("requesting a certificate")
+	if c.lastCertificate != nil {
+		c.RenewCertificate()
+		return
+	}
+
 	certificates, err := c.legoClient.Certificate.Obtain(certificate.ObtainRequest{
 		Domains: []string{"*.local-ip.sh"},
 		Bundle:  true,
@@ -23,7 +32,33 @@ func (c *certsClient) RequestCertificate() {
 		log.Fatal(err)
 	}
 
-	fmt.Printf("%#v\n", certificates)
+	c.lastCertificate = certificates
+
+	persistFiles(certificates)
+	log.Printf("%#v\n", certificates)
+}
+
+func (c *certsClient) RenewCertificate() {
+	log.Println("renewing currently existing certificate")
+	certificates, err := c.legoClient.Certificate.Renew(*c.lastCertificate, true, false, "")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	c.lastCertificate = certificates
+
+	persistFiles(certificates)
+	log.Printf("%#v\n", certificates)
+}
+
+func persistFiles(certificates *certificate.Resource) {
+	os.WriteFile("/certs/server.pem", certificates.Certificate, 0o644)
+	os.WriteFile("/certs/server.key", certificates.PrivateKey, 0o644)
+	jsonBytes, err := json.MarshalIndent(certificates, "", "\t")
+	if err != nil {
+		log.Fatal(err)
+	}
+	os.WriteFile("/certs/output.json", jsonBytes, 0o644)
 }
 
 func NewCertsClient(xip *xip.Xip, user *Account) *certsClient {
@@ -35,9 +70,41 @@ func NewCertsClient(xip *xip.Xip, user *Account) *certsClient {
 	}
 
 	provider := newProviderLocalIp(xip)
-	legoClient.Challenge.SetDNS01Provider(provider, dns01.AddRecursiveNameservers([]string{"1.1.1.1:53", "8.8.8.8:53"}))
+	legoClient.Challenge.SetDNS01Provider(provider, dns01.AddRecursiveNameservers([]string{"1.1.1.1:53", "8.8.8.8:53"}), dns01.DisableCompletePropagationRequirement())
+
+	lastCertificate := getLastCertificate(legoClient)
 
 	return &certsClient{
 		legoClient,
+		lastCertificate,
 	}
 }
+
+func getLastCertificate(legoClient *lego.Client) *certificate.Resource {
+	jsonBytes, err := os.ReadFile("/certs/output.json")
+	if err != nil {
+		if strings.Contains(err.Error(), "no such file or directory") {
+			return nil
+		}
+		log.Println(err)
+		log.Println("falling back to getting a brand new cert")
+		return nil
+	}
+
+	var lastCertificate = &certificate.Resource{}
+	err = json.Unmarshal(jsonBytes, lastCertificate)
+	if err != nil {
+		log.Println(err)
+		log.Println("falling back to getting a brand new cert")
+		return nil
+	}
+
+	lastCertificate, err = legoClient.Certificate.Get(lastCertificate.CertURL, true)
+	if err != nil {
+		log.Println(err)
+		log.Println("falling back to getting a brand new cert")
+		return nil
+	}
+
+	return lastCertificate
+}

certs/config.go

@@ -9,7 +9,7 @@ import (
 
 const (
 	email    = "admin@local-ip.sh"
-	caDirUrl = lego.LEDirectoryStaging
+	caDirUrl = lego.LEDirectoryProduction
 )
 
 var parsedCaDirUrl, _ = url.Parse(caDirUrl)

fly.toml

@@ -16,3 +16,7 @@ processes = []
 
   [[services.ports]]
     port = "53"
+
+[mounts]
+  source="certs"
+  destination="/certs"

main.go

@@ -2,8 +2,11 @@ package main
 
 import (
 	"flag"
+	"log"
 	"strings"
+	"time"
 
+	"local-ip.sh/certs"
 	"local-ip.sh/xip"
 )
 
@@ -18,16 +21,20 @@ func main() {
 
 	n := xip.NewXip(zone, strings.Split(nameservers, ","), *port)
 
-	// not functional yet
-	/* go func() {
+	go func() {
 		account := certs.LoadAccount()
 		log.Println(account.Registration.Body.Contact)
-		ddd := certs.NewCertsClient(n, account)
+		certsClient := certs.NewCertsClient(n, account)
 
 		time.Sleep(5 * time.Second)
-		fmt.Println("requesting certs")
-		ddd.RequestCertificate()
-	}() */
+		certsClient.RequestCertificate()
+
+		for {
+			// renew certificate every month
+			time.Sleep(30 * 24 * time.Hour)
+			certsClient.RenewCertificate()
+		}
+	}()
 
 	n.StartServer()
 }

xip/xip.go

@@ -92,9 +92,7 @@ var (
 				{Target: "local-ip.sh.n2kl11.flydns.net."},
 			}, */
 			// if manual
-			TXT: &dns.TXT{
-				Txt: []string{"FRMKrfS9tGP5Gap6ruCG7qRprBlMrsBnQPtMD-dmOGk"},
-			},
+			TXT: &dns.TXT{},
 		},
 	}
 )
@@ -334,13 +332,13 @@ func (xip *Xip) soaRecord(question dns.Question) *dns.SOA {
 
 func (xip *Xip) handleQuery(message *dns.Msg) {
 	for _, question := range message.Question {
-		log.Printf("name: %s\n", question.Name)
-		log.Printf("class: %d\n", question.Qclass)
-		log.Printf("type: %d\n", question.Qtype)
+		// log.Printf("name: %s\n", question.Name)
+		// log.Printf("class: %d\n", question.Qclass)
+		// log.Printf("type: %d\n", question.Qtype)
 
-		if strings.HasPrefix(strings.ToLower(question.Name), "_acme-challenge.") {
+		/* if strings.HasPrefix(strings.ToLower(question.Name), "_acme-challenge.") {
 			message.Authoritative = false
-		}
+		} */
 
 		switch question.Qtype {
 		case dns.TypeA:
@@ -399,7 +397,7 @@ func NewXip(zone string, nameservers []string, port int) (xip *Xip) {
 	}
 
 	xip.server = dns.Server{
-		Addr: "0.0.0.0:" + strconv.Itoa(port),
+		Addr: ":" + strconv.Itoa(port),
 		Net:  "udp",
 	}