Store OAuth2 session data in database (#3660)

* Store OAuth2 session data in database

* Rename table to `oauth2_session` and do not skip xormstorage initialization error

vendor/github.com/lafriks/xormstore/util/time_stamp.go

@@ -0,0 +1,60 @@
+package util
+
+import (
+	"time"
+)
+
+// TimeStamp defines a timestamp
+type TimeStamp int64
+
+// TimeStampNow returns now int64
+func TimeStampNow() TimeStamp {
+	return TimeStamp(time.Now().Unix())
+}
+
+// Add adds seconds and return sum
+func (ts TimeStamp) Add(seconds int64) TimeStamp {
+	return ts + TimeStamp(seconds)
+}
+
+// AddDuration adds time.Duration and return sum
+func (ts TimeStamp) AddDuration(interval time.Duration) TimeStamp {
+	return ts + TimeStamp(interval/time.Second)
+}
+
+// Year returns the time's year
+func (ts TimeStamp) Year() int {
+	return ts.AsTime().Year()
+}
+
+// AsTime convert timestamp as time.Time in Local locale
+func (ts TimeStamp) AsTime() (tm time.Time) {
+	tm = time.Unix(int64(ts), 0).Local()
+	return
+}
+
+// AsTimePtr convert timestamp as *time.Time in Local locale
+func (ts TimeStamp) AsTimePtr() *time.Time {
+	tm := time.Unix(int64(ts), 0).Local()
+	return &tm
+}
+
+// Format formats timestamp as
+func (ts TimeStamp) Format(f string) string {
+	return ts.AsTime().Format(f)
+}
+
+// FormatLong formats as RFC1123Z
+func (ts TimeStamp) FormatLong() string {
+	return ts.Format(time.RFC1123Z)
+}
+
+// FormatShort formats as short
+func (ts TimeStamp) FormatShort() string {
+	return ts.Format("Jan 02, 2006")
+}
+
+// IsZero is zero time
+func (ts TimeStamp) IsZero() bool {
+	return ts.AsTime().IsZero()
+}