详解如何使用go-acme/lego实现自动签发证书

go install github.com/go-acme/lego/v4/cmd/lego@latest

lego --email="you@example.com" --domains="example.com" --http run

TENCENTCLOUD_SECRET_ID=abcdefghijklmnopqrstuvwx \ 
TENCENTCLOUD_SECRET_KEY=your-secret-key \ 
lego --email you@example.com --dns tencentcloud --domains my.example.org run

package main

import (
	"crypto"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"fmt"
	"github.com/go-acme/lego/v4/certcrypto"
	"github.com/go-acme/lego/v4/certificate"
	"github.com/go-acme/lego/v4/lego"
	"github.com/go-acme/lego/v4/providers/dns/tencentcloud"
	"github.com/go-acme/lego/v4/registration"
	"log"
	"os"
)

type MyUser struct {
	Email        string
	Registration *registration.Resource
	key          crypto.PrivateKey
}

func (u *MyUser) GetEmail() string {
	return u.Email
}
func (u MyUser) GetRegistration() *registration.Resource {
	return u.Registration
}
func (u *MyUser) GetPrivateKey() crypto.PrivateKey {
	return u.key
}

func main() {
	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		log.Fatal(err)
	}
	myUser := MyUser{
		Email: "you@example.com",
		key:   privateKey,
	}
	config := lego.NewConfig(&myUser)
	config.Certificate.KeyType = certcrypto.RSA2048
	client, err := lego.NewClient(config)
	if err != nil {
		log.Fatal(err)
	}
        
   // 使用dns验证的方式，这边以腾讯云为例子。
	cfg := tencentcloud.NewDefaultConfig()
	cfg.SecretID = "abcdefghijklmnopqrstuvwx"
	cfg.SecretKey = "your-secret-key"
	p, err := tencentcloud.NewDNSProviderConfig(cfg)
	if err != nil {
		log.Fatal(err)
	}
	err = client.Challenge.SetDNS01Provider(p)
	if err != nil {
		log.Fatal(err)
	}
   // ---------使用dns-腾讯云验证的方式结束-----------
   
   // 使用http服务器验证的方式，注释上面dns验证的代码部分，取消下面http验证的代码注释部分
	// err = client.Challenge.SetHTTP01Provider(http01.NewProviderServer("", "80"))
	// if err != nil {
	// 	log.Fatal(err)
	// }
	// err = client.Challenge.SetTLSALPN01Provider(tlsalpn01.NewProviderServer("", "443"))
	// if err != nil {
	// 	log.Fatal(err)
	// }
   //-----------使用http服务器验证的方式结束-----------
   
	reg, err := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
	if err != nil {
		log.Fatal(err)
	}
	myUser.Registration = reg
	request := certificate.ObtainRequest{
		Domains: []string{"sd.pigudaxiang.cn"},
		Bundle:  true,
	}
	certificates, err := client.Certificate.Obtain(request)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%#v\n", certificates)
	err = os.WriteFile("PrivateKey", certificates.PrivateKey, os.ModePerm)
	if err != nil {
		log.Print(err)
	}
	err = os.WriteFile("Certificate", certificates.Certificate, os.ModePerm)
	if err != nil {
		log.Print(err)
	}
	err = os.WriteFile("IssuerCertificate", certificates.IssuerCertificate, os.ModePerm)
	if err != nil {
		log.Print(err)
	}
	err = os.WriteFile("CSR", certificates.CSR, os.ModePerm)
	if err != nil {
		log.Print(err)
	}
}