misc.go

   1 /*
   2  * Misc function definitions for fbfp.
   3  *
   4  * Copyright (C) 2024  Runxi Yu <https://runxiyu.org>
   5  * SPDX-License-Identifier: AGPL-3.0-or-later
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  */
  20
  21 package main
  22
  23 import (
  24         "crypto/rand"
  25         "encoding/base64"
  26 )
  27
  28 func e(err error) {
  29         if err != nil {
  30                 panic(err)
  31         }
  32 }
  33
  34 func er[v_t any](v v_t, err error) v_t {
  35         if err != nil {
  36                 panic(err)
  37         }
  38         return v
  39 }
  40
  41 /*
  42  * Generate a random url-safe string.
  43  * Note that the "len" parameter specifies the number of bytes taken from the
  44  * random source divided by three and does NOT represent the length of the
  45  * encoded string.
  46  */
  47 func random(len int) string {
  48         r := make([]byte, 3*len)
  49         rand.Read(r)
  50         return base64.RawURLEncoding.EncodeToString(r)
  51 }