Files
amsterdam/util/random.go
T

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2.5 KiB
Go

/*
* Amsterdam Web Communities System
* Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
// Package util contains utility definitions.
package util
import (
crand "crypto/rand"
"io"
mrand "math/rand"
"strings"
)
// authAlphabet is the set of characters from which we generate auth strings.
const authAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./"
// authStringLen is the standard lengtth of authentication strings.
const authStringLen = 32
// syllabary is used to generate random passwords.
var syllabary = [...]string{
"ba",
"be",
"bi", "bo", "bu",
"da", "de", "di", "do", "du",
"cha", "chi", "cho", "chu",
"fa", "fe", "fi", "fo", "fu",
"ga", "ge", "gi", "go", "gu",
"ha", "he", "hi", "ho", "hu",
"ja", "je", "ji", "jo", "ju",
"ka", "ke", "ki", "ko", "ku",
"la", "le", "li", "lo", "lu",
"ma", "me", "mi", "mo", "mu",
"na", "ne", "ni", "no", "nu",
"pa", "pe", "pi", "po", "pu",
"ra", "re", "ri", "ro", "ru",
"sa", "se", "si", "so", "su",
"sha", "she", "sho", "shu",
"ta", "te", "ti", "to", "tu",
"va", "ve", "vi", "vo", "vu",
"wa", "we", "wi", "wo", "wu",
"ya", "ye", "yi", "yo", "yu",
"za", "ze", "zi", "zo", "zu",
}
// GenerateRandomAuthString generates a random authentication string.
func GenerateRandomAuthString() string {
b := make([]byte, authStringLen)
if _, err := io.ReadFull(crand.Reader, b); err != nil {
// can't happen (at least on a modern OS)
panic("failed to read random: " + err.Error())
}
for i := 0; i < authStringLen; i++ {
b[i] = authAlphabet[int(b[i])%len(authAlphabet)]
}
return string(b)
}
// GenerateRandomConfirmationNumber generates a random 7-digit confirmation number.
func GenerateRandomConfirmationNumber() int32 {
return mrand.Int31n(9000000) + 1000000
}
// GenerateRandomPassword generates a random password string.
func GenerateRandomPassword() string {
var b strings.Builder
rd := make([]byte, 7)
if _, err := io.ReadFull(crand.Reader, rd); err != nil {
// can't happen (at least on a modern OS)
panic("failed to read random: " + err.Error())
}
for i := 0; i < 4; i++ { // add random syllables
b.WriteString(syllabary[int(rd[i])%len(syllabary)])
}
for i := 4; i < 7; i++ { // add random digits
b.WriteByte(byte('0' + int(rd[i])%10))
}
return b.String()
}