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