c3ca8e2974
This commit removes various modules that can be migrated to the github.com/tkw1536/pkglib package without any code changes (beyond module renamings).
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Package password allows generating random passwords
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package password
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import (
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"crypto/rand"
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"math/big"
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"github.com/tkw1536/pkglib/pools"
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)
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// NOTE(twiesing): A bunch of scripts cannot properly handle the extra characters in the password.
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// For now it is disabled, but it should be re-enabled later.
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const PasswordCharSet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" // + "!@#$%&*"
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var passwordCharCount = big.NewInt(int64(len(PasswordCharSet)))
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// Password returns a randomly generated string with the provided length.
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// It consists of alphanumeric characters only.
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//
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// When an error occurs, it is guaranteed to return "", err.
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// [rand.Reader] is used as the source of randomness.
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func Password(length int) (string, error) {
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if length < 0 {
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panic("length < 0")
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}
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// create a buffer to write the string to!
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password := pools.GetBuilder()
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defer pools.ReleaseBuilder(password)
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password.Grow(length)
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for i := 0; i < length; i++ {
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// grab a random bIndex!
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bIndex, err := rand.Int(rand.Reader, passwordCharCount)
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if err != nil {
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return "", err
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}
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// and use that index!
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index := int(bIndex.Int64())
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if err := password.WriteByte(PasswordCharSet[index]); err != nil {
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return "", err
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}
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}
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// return the password!
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return password.String(), nil
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}
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