迁移并重构项目，优化了执行流程

pkg/utils/apply.go

@@ -0,0 +1,71 @@
+package utils
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+
+	"github.com/go-acme/lego/v4/certcrypto"
+	"github.com/go-acme/lego/v4/certificate"
+	"github.com/go-acme/lego/v4/challenge"
+	"github.com/go-acme/lego/v4/lego"
+	"github.com/go-acme/lego/v4/registration"
+)
+
+func ApplyCert(domains []string, email string, provider challenge.Provider) ([]byte, []byte, error) {
+
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	user := RegistrationUser{
+		Email: email,
+		Key:   privateKey,
+	}
+
+	config := lego.NewConfig(&user)
+	config.Certificate.KeyType = certcrypto.RSA2048
+	client, err := lego.NewClient(config)
+	if err != nil {
+		return nil, nil, err
+	}
+	err = client.Challenge.SetDNS01Provider(provider)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	_, err = client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	request := certificate.ObtainRequest{
+		Domains: domains,
+		Bundle:  true,
+	}
+
+	certResource, err := client.Certificate.Obtain(request)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return certResource.Certificate, certResource.PrivateKey, err
+}
+
+type RegistrationUser struct {
+	Email        string
+	Registration *registration.Resource
+	Key          crypto.PrivateKey
+}
+
+func (registrationUser *RegistrationUser) GetEmail() string {
+	return registrationUser.Email
+}
+func (registrationUser *RegistrationUser) GetRegistration() *registration.Resource {
+	return registrationUser.Registration
+}
+func (registrationUser *RegistrationUser) GetPrivateKey() crypto.PrivateKey {
+	return registrationUser.Key
+}