迁移并重构项目，优化了执行流程

internal/Func/CheckNodes.go

@@ -0,0 +1,18 @@
+package Func
+
+import (
+	"SafeLine-Acme/internal/class/SafeLine"
+	"time"
+)
+
+func CheckNodes(nodes []SafeLine.Nodes, n int) []SafeLine.Nodes {
+	var need []SafeLine.Nodes
+	date := time.Now()
+	for _, node := range nodes {
+		days := int(node.ValidBefore.Sub(date).Hours() / 24)
+		if days <= n {
+			need = append(need, node)
+		}
+	}
+	return need
+}

internal/Func/ChooseProvider.go

@@ -0,0 +1,20 @@
+package Func
+
+import (
+	"SafeLine-Acme/internal/app/logger"
+	"SafeLine-Acme/internal/class/Acme"
+
+	"github.com/go-acme/lego/v4/challenge"
+)
+
+func ChooseProvider(config Acme.Object) ([]challenge.Provider, bool) {
+	providers, errors := config.DNSProvider.Choose()
+	for _, e := range errors {
+		logger.Error.Println(e)
+	}
+	if len(providers) == 0 {
+		logger.Error.Println()
+		return nil, true
+	}
+	return providers, false
+}

internal/Func/UpdateCheck.go

@@ -0,0 +1,19 @@
+package Func
+
+import (
+	"SafeLine-Acme/internal/app/logger"
+	"SafeLine-Acme/internal/class/SafeLine"
+	"log"
+)
+
+func UpdateCertCheck(server SafeLine.Object, days int) ([]SafeLine.Nodes, bool) {
+	nodes := server.GetCertNodes()
+	needUpdate := CheckNodes(nodes, days)
+	if len(needUpdate) != 0 {
+		log.Printf("本次需要更新证书数量有 %s%d%s 个，现在开始更新...", logger.Yellow, len(needUpdate), logger.Reset)
+	} else {
+		log.Print("本次无需更新证书，即将退出本程序。")
+		return nil, true
+	}
+	return needUpdate, false
+}