forked from casdoor/casdoor
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2021 The Casdoor Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"crypto/rand"
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"math/big"
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"github.com/google/uuid"
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"github.com/thanhpk/randstr"
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)
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func GenerateClientId() string {
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return randstr.Hex(10)
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}
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func GenerateClientSecret() string {
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return randstr.Hex(20)
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}
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func GeneratePasswordSalt() string {
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return randstr.Hex(10)
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}
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// RandomIntn returns a cryptographically secure random int in [0, n).
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func RandomIntn(n int) int {
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val, err := rand.Int(rand.Reader, big.NewInt(int64(n)))
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if err != nil {
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panic(err)
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}
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return int(val.Int64())
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}
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// GenerateUUID returns a random UUID v4 string.
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func GenerateUUID() string {
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return uuid.NewString()
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}
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// RandomStringFromCharset returns a cryptographically secure random string
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// of the given length drawn from charset.
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func RandomStringFromCharset(charset string, length int) string {
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result := make([]byte, length)
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for i := range result {
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result[i] = charset[RandomIntn(len(charset))]
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}
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return string(result)
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}
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func GetRandomName() string {
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return RandomStringFromCharset("0123456789abcdefghijklmnopqrstuvwxyz", 6)
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}
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func generateRandomString(length int) (string, error) {
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return RandomStringFromCharset("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", length), nil
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}
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func GenerateTwoUniqueRandomStrings() (string, string, error) {
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len1 := 16 + int(big.NewInt(17).Int64())
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len2 := 16 + int(big.NewInt(17).Int64())
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str1, err := generateRandomString(len1)
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if err != nil {
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return "", "", err
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}
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str2, err := generateRandomString(len2)
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if err != nil {
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return "", "", err
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}
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for str1 == str2 {
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str2, err = generateRandomString(len2)
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if err != nil {
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return "", "", err
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}
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}
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return str1, str2, nil
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}
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