♻️ Refactor code

🔥 Remove update detection

common/sub.go

@@ -0,0 +1,85 @@
+package common
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sub2clash/config"
+	"sync"
+	"time"
+)
+
+var subsDir = "subs"
+var fileLock sync.RWMutex
+
+func LoadSubscription(url string, refresh bool) ([]byte, error) {
+	if refresh {
+		return FetchSubscriptionFromAPI(url)
+	}
+	hash := sha256.Sum224([]byte(url))
+	fileName := filepath.Join(subsDir, hex.EncodeToString(hash[:]))
+	stat, err := os.Stat(fileName)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return nil, err
+		}
+		return FetchSubscriptionFromAPI(url)
+	}
+	lastGetTime := stat.ModTime().Unix() // 单位是秒
+	if lastGetTime+config.Default.CacheExpire > time.Now().Unix() {
+		file, err := os.Open(fileName)
+		if err != nil {
+			return nil, err
+		}
+		defer func(file *os.File) {
+			if file != nil {
+				_ = file.Close()
+			}
+		}(file)
+		fileLock.RLock()
+		defer fileLock.RUnlock()
+		subContent, err := io.ReadAll(file)
+		if err != nil {
+			return nil, err
+		}
+		return subContent, nil
+	}
+	return FetchSubscriptionFromAPI(url)
+}
+
+func FetchSubscriptionFromAPI(url string) ([]byte, error) {
+	hash := sha256.Sum224([]byte(url))
+	fileName := filepath.Join(subsDir, hex.EncodeToString(hash[:]))
+	resp, err := Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer func(Body io.ReadCloser) {
+		if Body != nil {
+			_ = Body.Close()
+		}
+	}(resp.Body)
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+	file, err := os.Create(fileName)
+	if err != nil {
+		return nil, err
+	}
+	defer func(file *os.File) {
+		if file != nil {
+			_ = file.Close()
+		}
+	}(file)
+	fileLock.Lock()
+	defer fileLock.Unlock()
+	_, err = file.Write(data)
+	if err != nil {
+		return nil, fmt.Errorf("failed to write to sub.yaml: %w", err)
+	}
+	return data, nil
+}