77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
/*
|
|
GoToSocial
|
|
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package id
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"math/big"
|
|
"time"
|
|
|
|
"github.com/oklog/ulid"
|
|
)
|
|
|
|
const (
|
|
Highest = "ZZZZZZZZZZZZZZZZZZZZZZZZZZ" // Highest is the highest possible ULID
|
|
Lowest = "00000000000000000000000000" // Lowest is the lowest possible ULID
|
|
randomRange = 631152381 // ~20 years in seconds
|
|
)
|
|
|
|
// ULID represents a Universally Unique Lexicographically Sortable Identifier of 26 characters. See https://github.com/oklog/ulid
|
|
type ULID string
|
|
|
|
// NewULID returns a new ULID string using the current time, or an error if something goes wrong.
|
|
func NewULID() (string, error) {
|
|
newUlid, err := ulid.New(ulid.Timestamp(time.Now()), rand.Reader)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return newUlid.String(), nil
|
|
}
|
|
|
|
// NewULIDFromTime returns a new ULID string using the given time, or an error if something goes wrong.
|
|
func NewULIDFromTime(t time.Time) (string, error) {
|
|
newUlid, err := ulid.New(ulid.Timestamp(t), rand.Reader)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return newUlid.String(), nil
|
|
}
|
|
|
|
// NewRandomULID returns a new ULID string using a random time in an ~80 year range around the current datetime, or an error if something goes wrong.
|
|
func NewRandomULID() (string, error) {
|
|
b1, err := rand.Int(rand.Reader, big.NewInt(randomRange))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
r1 := time.Duration(int(b1.Int64()))
|
|
|
|
b2, err := rand.Int(rand.Reader, big.NewInt(randomRange))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
r2 := -time.Duration(int(b2.Int64()))
|
|
|
|
arbitraryTime := time.Now().Add(r1 * time.Second).Add(r2 * time.Second)
|
|
newUlid, err := ulid.New(ulid.Timestamp(arbitraryTime), rand.Reader)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return newUlid.String(), nil
|
|
}
|