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token.go
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/
token.go
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package libsf
import (
"encoding/base64"
"fmt"
"log"
"strconv"
"strings"
"time"
)
// TimeFromToken retrieves datetime from cursor/sync token.
func TimeFromToken(token string) time.Time {
raw, err := base64.URLEncoding.DecodeString(token) // meh, there aren't none ASCII characters in a Unix timestamp.
if err != nil {
log.Println("GetTimeFromToken:", err)
return time.Now().UTC()
}
parts := strings.Split(string(raw), ":")
if parts[0] == "1" {
// Do not support v1 `1:474536275' (Unix timestamp in seconds)
log.Println("GetTimeFromToken: unsupported v1 token date")
return time.Now().UTC()
}
// v2 token `1:4745362752134567' (Unix timestamp in nanoseconds)
timestamp, err := strconv.ParseInt(parts[1], 10, 64)
if err != nil {
log.Println("GetTimeFromToken:", err)
return time.Now().UTC()
}
return time.Unix(0, timestamp).UTC()
}
// TokenFromTime generates cursor/sync token for given time.
func TokenFromTime(t time.Time) (token string) {
token = fmt.Sprintf("2:%d", t.UTC().UnixNano())
// meh, there aren't none ASCII characters in a Unix timestamp.
return base64.URLEncoding.EncodeToString([]byte(token))
}