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gitea/modules/util/util.go
2024-03-14 01:10:51 +00:00

223 lines
5 KiB
Go

// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package util
import (
"bytes"
"crypto/rand"
"fmt"
"math/big"
"strconv"
"strings"
"code.gitea.io/gitea/modules/optional"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
// OptionalBoolParse get the corresponding optional.Option[bool] of a string using strconv.ParseBool
func OptionalBoolParse(s string) optional.Option[bool] {
v, e := strconv.ParseBool(s)
if e != nil {
return optional.None[bool]()
}
return optional.Some(v)
}
// IsEmptyString checks if the provided string is empty
func IsEmptyString(s string) bool {
return len(strings.TrimSpace(s)) == 0
}
// NormalizeEOL will convert Windows (CRLF) and Mac (CR) EOLs to UNIX (LF)
func NormalizeEOL(input []byte) []byte {
var right, left, pos int
if right = bytes.IndexByte(input, '\r'); right == -1 {
return input
}
length := len(input)
tmp := make([]byte, length)
// We know that left < length because otherwise right would be -1 from IndexByte.
copy(tmp[pos:pos+right], input[left:left+right])
pos += right
tmp[pos] = '\n'
left += right + 1
pos++
for left < length {
if input[left] == '\n' {
left++
}
right = bytes.IndexByte(input[left:], '\r')
if right == -1 {
copy(tmp[pos:], input[left:])
pos += length - left
break
}
copy(tmp[pos:pos+right], input[left:left+right])
pos += right
tmp[pos] = '\n'
left += right + 1
pos++
}
return tmp[:pos]
}
// CryptoRandomInt returns a crypto random integer between 0 and limit, inclusive
func CryptoRandomInt(limit int64) (int64, error) {
rInt, err := rand.Int(rand.Reader, big.NewInt(limit))
if err != nil {
return 0, err
}
return rInt.Int64(), nil
}
const alphanumericalChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
// CryptoRandomString generates a crypto random alphanumerical string, each byte is generated by [0,61] range
func CryptoRandomString(length int64) (string, error) {
buf := make([]byte, length)
limit := int64(len(alphanumericalChars))
for i := range buf {
num, err := CryptoRandomInt(limit)
if err != nil {
return "", err
}
buf[i] = alphanumericalChars[num]
}
return string(buf), nil
}
// CryptoRandomBytes generates `length` crypto bytes
// This differs from CryptoRandomString, as each byte in CryptoRandomString is generated by [0,61] range
// This function generates totally random bytes, each byte is generated by [0,255] range
func CryptoRandomBytes(length int64) ([]byte, error) {
buf := make([]byte, length)
_, err := rand.Read(buf)
return buf, err
}
// ToUpperASCII returns s with all ASCII letters mapped to their upper case.
func ToUpperASCII(s string) string {
b := []byte(s)
for i, c := range b {
if 'a' <= c && c <= 'z' {
b[i] -= 'a' - 'A'
}
}
return string(b)
}
// ToTitleCase returns s with all english words capitalized
func ToTitleCase(s string) string {
// `cases.Title` is not thread-safe, do not use global shared variable for it
return cases.Title(language.English).String(s)
}
// ToTitleCaseNoLower returns s with all english words capitalized without lower-casing
func ToTitleCaseNoLower(s string) string {
// `cases.Title` is not thread-safe, do not use global shared variable for it
return cases.Title(language.English, cases.NoLower).String(s)
}
// ToInt64 transform a given int into int64.
func ToInt64(number any) (int64, error) {
var value int64
switch v := number.(type) {
case int:
value = int64(v)
case int8:
value = int64(v)
case int16:
value = int64(v)
case int32:
value = int64(v)
case int64:
value = v
case uint:
value = int64(v)
case uint8:
value = int64(v)
case uint16:
value = int64(v)
case uint32:
value = int64(v)
case uint64:
value = int64(v)
case float32:
value = int64(v)
case float64:
value = int64(v)
case string:
var err error
if value, err = strconv.ParseInt(v, 10, 64); err != nil {
return 0, err
}
default:
return 0, fmt.Errorf("unable to convert %v to int64", number)
}
return value, nil
}
// ToFloat64 transform a given int into float64.
func ToFloat64(number any) (float64, error) {
var value float64
switch v := number.(type) {
case int:
value = float64(v)
case int8:
value = float64(v)
case int16:
value = float64(v)
case int32:
value = float64(v)
case int64:
value = float64(v)
case uint:
value = float64(v)
case uint8:
value = float64(v)
case uint16:
value = float64(v)
case uint32:
value = float64(v)
case uint64:
value = float64(v)
case float32:
value = float64(v)
case float64:
value = v
case string:
var err error
if value, err = strconv.ParseFloat(v, 64); err != nil {
return 0, err
}
default:
return 0, fmt.Errorf("unable to convert %v to float64", number)
}
return value, nil
}
// ToPointer returns the pointer of a copy of any given value
func ToPointer[T any](val T) *T {
return &val
}
// IfZero returns "def" if "v" is a zero value, otherwise "v"
func IfZero[T comparable](v, def T) T {
var zero T
if v == zero {
return def
}
return v
}