mirror of
https://github.com/go-gitea/gitea.git
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49dd906753
* Use base32 for 2FA scratch token * rename Secure* to Crypto*, add comments
173 lines
4.0 KiB
Go
173 lines
4.0 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package util
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import (
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"bytes"
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"crypto/rand"
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"errors"
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"math/big"
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"strconv"
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"strings"
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)
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// OptionalBool a boolean that can be "null"
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type OptionalBool byte
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const (
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// OptionalBoolNone a "null" boolean value
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OptionalBoolNone OptionalBool = iota
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// OptionalBoolTrue a "true" boolean value
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OptionalBoolTrue
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// OptionalBoolFalse a "false" boolean value
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OptionalBoolFalse
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)
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// IsTrue return true if equal to OptionalBoolTrue
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func (o OptionalBool) IsTrue() bool {
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return o == OptionalBoolTrue
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}
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// IsFalse return true if equal to OptionalBoolFalse
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func (o OptionalBool) IsFalse() bool {
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return o == OptionalBoolFalse
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}
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// IsNone return true if equal to OptionalBoolNone
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func (o OptionalBool) IsNone() bool {
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return o == OptionalBoolNone
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}
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// OptionalBoolOf get the corresponding OptionalBool of a bool
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func OptionalBoolOf(b bool) OptionalBool {
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if b {
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return OptionalBoolTrue
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}
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return OptionalBoolFalse
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}
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// OptionalBoolParse get the corresponding OptionalBool of a string using strconv.ParseBool
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func OptionalBoolParse(s string) OptionalBool {
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b, e := strconv.ParseBool(s)
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if e != nil {
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return OptionalBoolNone
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}
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return OptionalBoolOf(b)
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}
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// Max max of two ints
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func Max(a, b int) int {
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if a < b {
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return b
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}
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return a
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}
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// Min min of two ints
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func Min(a, b int) int {
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if a > b {
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return b
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}
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return a
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}
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// IsEmptyString checks if the provided string is empty
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func IsEmptyString(s string) bool {
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return len(strings.TrimSpace(s)) == 0
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}
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// NormalizeEOL will convert Windows (CRLF) and Mac (CR) EOLs to UNIX (LF)
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func NormalizeEOL(input []byte) []byte {
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var right, left, pos int
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if right = bytes.IndexByte(input, '\r'); right == -1 {
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return input
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}
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length := len(input)
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tmp := make([]byte, length)
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// We know that left < length because otherwise right would be -1 from IndexByte.
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copy(tmp[pos:pos+right], input[left:left+right])
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pos += right
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tmp[pos] = '\n'
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left += right + 1
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pos++
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for left < length {
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if input[left] == '\n' {
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left++
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}
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right = bytes.IndexByte(input[left:], '\r')
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if right == -1 {
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copy(tmp[pos:], input[left:])
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pos += length - left
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break
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}
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copy(tmp[pos:pos+right], input[left:left+right])
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pos += right
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tmp[pos] = '\n'
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left += right + 1
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pos++
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}
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return tmp[:pos]
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}
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// MergeInto merges pairs of values into a "dict"
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func MergeInto(dict map[string]interface{}, values ...interface{}) (map[string]interface{}, error) {
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for i := 0; i < len(values); i++ {
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switch key := values[i].(type) {
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case string:
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i++
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if i == len(values) {
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return nil, errors.New("specify the key for non array values")
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}
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dict[key] = values[i]
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case map[string]interface{}:
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m := values[i].(map[string]interface{})
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for i, v := range m {
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dict[i] = v
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}
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default:
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return nil, errors.New("dict values must be maps")
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}
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}
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return dict, nil
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}
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// CryptoRandomInt returns a crypto random integer between 0 and limit, inclusive
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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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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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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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