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49 lines
1.7 KiB
Go
49 lines
1.7 KiB
Go
package generators
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import (
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"crypto/rand"
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"math/big"
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)
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const (
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// PasswordChars contains alphanumeric chars (0-9, A-Z, a-z), plus "-=+!@#$%^&*."
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PasswordChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-=+!@#$%^&*."
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// AlphaNumChars contains alphanumeric chars (0-9, A-Z, a-z)
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AlphaNumChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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)
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// GenerateRandomPassword generates a random password with the given length.
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// The password will contain chars picked from the `PasswordChars` constant.
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// If an error happens, the string will be empty and the error will be non-nil.
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//
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// This is equivalent to `GenerateRandomString(PasswordChars, length)`
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func GenerateRandomPassword(length int) (string, error) {
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return generateString(PasswordChars, length)
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}
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// GenerateRandomString generates a random string with the given length
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// based on the chars provided. You can use `PasswordChars` or `AlphaNumChars`
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// constants, or even any other string.
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//
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// Chars from the provided string will be picked uniformly. The provided
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// constants have unique chars, which means that all the chars will have the
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// same probability of being picked.
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// You can use your own strings to change that probability. For example, using
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// "AAAB" you'll have a 75% of probability of getting "A" and 25% of "B"
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func GenerateRandomString(chars string, length int) (string, error) {
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return generateString(chars, length)
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}
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func generateString(chars string, length int) (string, error) {
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ret := make([]byte, length)
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for i := 0; i < length; i++ {
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num, err := rand.Int(rand.Reader, big.NewInt(int64(len(chars))))
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if err != nil {
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return "", err
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}
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ret[i] = chars[num.Int64()]
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}
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return string(ret), nil
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}
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