39 lines
894 B
Go
39 lines
894 B
Go
package utils
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import (
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"crypto/rand"
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"fmt"
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"math"
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"math/big"
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)
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type CustomError struct {
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Message string
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}
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func (e *CustomError) Error() string {
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return e.Message
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}
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// RandomString generates a string with the given length using crypt/rand
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func RandomString(length int) (string, error) {
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if length < 0 {
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err := &CustomError{Message: "Length has to be bigger than 0"}
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return "", err
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}
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if length > math.MaxInt32 {
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err := &CustomError{Message: fmt.Sprintf("Length has to be bigger than %d", math.MaxInt32)}
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return "", err
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}
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const characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
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byteSlice := make([]byte, length)
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for i := 0; i < length; i++ {
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randomInt, err := rand.Int(rand.Reader, big.NewInt(int64(len(characters))))
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if err != nil {
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return "", err
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}
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byteSlice[i] = characters[randomInt.Int64()]
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}
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return string(byteSlice), nil
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}
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