first commit

util/session.go

@@ -0,0 +1,65 @@
+package util
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"github.com/go-think/openssl"
+	"strconv"
+	"strings"
+	"time"
+)
+
+//有效时间30天
+const validTime = 30*24*time.Hour
+const key = ("1234567890123456")
+
+type Session struct {
+	MTime time.Time
+	Id    int
+}
+
+func NewSession(id int, time time.Time) *Session {
+	return &Session{Id: id, MTime: time}
+}
+
+func ParseSession(session string) (*Session, error) {
+	if session == ""{
+		return nil, errors.New("session is empty")
+	}
+	decode, err := base64.StdEncoding.DecodeString(session)
+	if err != nil{
+		return nil, err
+	}
+
+	data, _ := AesCBCDecrypt(decode, []byte(key), []byte(key),openssl.ZEROS_PADDING)
+	arr := strings.Split(string(data), "|")
+	if len(arr) != 2 {
+		return nil, errors.New("session format error")
+	}
+
+	int, err := strconv.Atoi(arr[0])
+	if err != nil{
+		return nil, err
+	}
+
+	time, err :=time.Parse("2006-01-02 15:04:05", arr[1])
+	if err != nil{
+		return nil, err
+	}
+
+	return &Session{Id: int, MTime: time}, nil
+}
+
+func (self *Session) String() string {
+	timeStr := self.MTime.Format("2006-01-02 15:04:05")
+	str := fmt.Sprintf("%d|%s", self.Id, timeStr)
+	data, _ := AesCBCEncrypt([]byte(str), []byte(key), []byte(key),openssl.ZEROS_PADDING)
+	encode := base64.StdEncoding.EncodeToString(data)
+	return encode
+}
+
+func (self *Session) IsValid() bool {
+	diff := time.Now().Sub(self.MTime)
+	return diff - time.Duration(validTime) < 0
+}