add cloudflare provider

internal/applicant/applicant.go

@@ -16,8 +16,9 @@ import (
 )
 
 const (
-	configTypeTencent = "tencent"
-	configTypeAliyun  = "aliyun"
+	configTypeTencent    = "tencent"
+	configTypeAliyun     = "aliyun"
+	configTypeCloudflare = "cloudflare"
 )
 
 type Certificate struct {
@@ -67,6 +68,8 @@ func Get(record *models.Record) (Applicant, error) {
 		return NewTencent(option), nil
 	case configTypeAliyun:
 		return NewAliyun(option), nil
+	case configTypeCloudflare:
+		return NewCloudflare(option), nil
 	default:
 		return nil, errors.New("unknown config type")
 	}