feat: add 123 link driver (close #4924)

drivers/123_link/util.go

@@ -0,0 +1,30 @@
+package _123Link
+
+import (
+	"crypto/md5"
+	"fmt"
+	"math/rand"
+	"net/url"
+	"time"
+)
+
+func SignURL(originURL, privateKey string, uid uint64, validDuration time.Duration) (newURL string, err error) {
+	if privateKey == "" {
+		return originURL, nil
+	}
+	var (
+		ts     = time.Now().Add(validDuration).Unix() // 有效时间戳
+		rInt   = rand.Int()                           // 随机正整数
+		objURL *url.URL
+	)
+	objURL, err = url.Parse(originURL)
+	if err != nil {
+		return "", err
+	}
+	authKey := fmt.Sprintf("%d-%d-%d-%x", ts, rInt, uid, md5.Sum([]byte(fmt.Sprintf("%s-%d-%d-%d-%s",
+		objURL.Path, ts, rInt, uid, privateKey))))
+	v := objURL.Query()
+	v.Add("auth_key", authKey)
+	objURL.RawQuery = v.Encode()
+	return objURL.String(), nil
+}