113 lines
1.9 KiB
Go
113 lines
1.9 KiB
Go
package passwd
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import (
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"errors"
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"fmt"
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"strings"
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)
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type Passwder interface {
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Passwd(string, string) (string, error)
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ApplyPasswd(*Passwd)
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}
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type Passwd struct {
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m map[string]Passwder
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d Passwder
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f Passwder
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}
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func New(opts ...Passwder) *Passwd {
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p := &Passwd{m: make(map[string]Passwder)}
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p.Options(opts...)
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return p
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}
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func (p *Passwd) Options(opts ...Passwder) {
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for _, o := range opts {
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o.ApplyPasswd(p)
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}
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}
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func (p *Passwd) Register(name string, pass Passwder) {
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p.m[name] = pass
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if p.d == nil {
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p.SetDefault(pass)
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}
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}
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func (p *Passwd) SetDefault(pass Passwder) {
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p.d = pass
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}
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func (p *Passwd) SetFallthrough(pass Passwder) {
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p.f = pass
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}
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func (p *Passwd) Passwd(pass, hash string) (string, error) {
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if hash == "" {
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return p.d.Passwd(pass, hash)
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}
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name, algo := p.getAlgo(hash)
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if algo == nil {
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algo = p.f
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}
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if algo == nil {
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return "", fmt.Errorf("%w: %s", ErrNoHandler, name)
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}
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return algo.Passwd(pass, hash)
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}
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func (p *Passwd) IsPreferred(hash string) bool {
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_, algo := p.getAlgo(hash)
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if algo != nil && algo == p.d {
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// if the algorithm defines its own check for preference.
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if ck, ok := algo.(interface{ IsPreferred(string) bool }); ok {
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return ck.IsPreferred(hash)
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}
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return true
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}
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return false
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}
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func (p *Passwd) getAlgo(hash string) (string, Passwder) {
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var algo string
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if !strings.HasPrefix(hash, "$") {
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return p.getName(p.f), p.f
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}
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if _, h, ok := strings.Cut(hash, "$"); ok {
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algo, _, ok = strings.Cut(h, "$")
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if !ok {
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return "", nil
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}
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if passwd, ok := p.m[algo]; ok {
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return algo, passwd
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}
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return algo, nil
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}
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return p.getName(p.f), p.f
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}
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func (p *Passwd) getName(n Passwder) string {
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if n == nil {
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return ""
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}
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for k, v := range p.m {
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if v == n {
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return k
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}
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}
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return "none"
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}
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var ErrNoMatch = errors.New("password does not match")
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var ErrBadHash = errors.New("password hash is malformed")
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var ErrNoHandler = errors.New("password handler not registered")
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