73 lines
2.5 KiB
Go
73 lines
2.5 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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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 Licensee 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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//
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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 Licensee for more details.
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//
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// You should have received a copy of the GNU Affero General Public Licensee
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package utils
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import (
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"code.vikunja.io/api/pkg/log"
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"crypto/rand"
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"math/big"
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)
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// MakeRandomString return a random string
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// Deprecated: use CryptoRandomString instead
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func MakeRandomString(n int) string {
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str, err := CryptoRandomString(int64(n))
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if err != nil {
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log.Errorf("Could not generate random string: %s", err)
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}
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return str
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}
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// CryptoRandomInt returns a crypto random integer between 0 and limit, inclusive
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// Copied from https://github.com/go-gitea/gitea/blob/main/modules/util/util.go#L121-L127
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func CryptoRandomInt(limit int64) (int64, error) {
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rInt, err := rand.Int(rand.Reader, big.NewInt(limit))
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if err != nil {
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return 0, err
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}
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return rInt.Int64(), nil
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}
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const alphanumericalChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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// CryptoRandomString generates a crypto random alphanumerical string, each byte is generated by [0,61] range
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// Copied from https://github.com/go-gitea/gitea/blob/main/modules/util/util.go#L131-L143
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func CryptoRandomString(length int64) (string, error) {
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buf := make([]byte, length)
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limit := int64(len(alphanumericalChars))
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for i := range buf {
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num, err := CryptoRandomInt(limit)
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if err != nil {
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return "", err
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}
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buf[i] = alphanumericalChars[num]
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}
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return string(buf), nil
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}
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// CryptoRandomBytes generates `length` crypto bytes
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// This differs from CryptoRandomString, as each byte in CryptoRandomString is generated by [0,61] range
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// This function generates totally random bytes, each byte is generated by [0,255] range
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// Copied from https://github.com/go-gitea/gitea/blob/main/modules/util/util.go#L145-L152
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func CryptoRandomBytes(length int64) ([]byte, error) {
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buf := make([]byte, length)
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_, err := rand.Read(buf)
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return buf, err
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}
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