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package api
import (
"net/http"
"golang.org/x/crypto/bcrypt"
)
// NewPasswordHash returns the hash of the given plaintext password, for use
// with Auther.
func NewPasswordHash(plaintext string) string {
hashedPassword, err := bcrypt.GenerateFromPassword([]byte(plaintext), 12)
if err != nil {
panic(err)
}
return string(hashedPassword)
}
// Auther determines who can do what.
type Auther interface {
Allowed(username, password string) bool
}
type auther struct {
users map[string]string
}
// NewAuther initializes and returns an Auther will which allow the given
// username and password hash combinations. Password hashes must have been
// created using NewPasswordHash.
func NewAuther(users map[string]string) Auther {
return &auther{users: users}
}
func (a *auther) Allowed(username, password string) bool {
hashedPassword, ok := a.users[username]
if !ok {
return false
}
err := bcrypt.CompareHashAndPassword(
[]byte(hashedPassword), []byte(password),
)
return err == nil
}
func authMiddleware(auther Auther, h http.Handler) http.Handler {
respondUnauthorized := func(rw http.ResponseWriter) {
rw.Header().Set("WWW-Authenticate", `Basic realm="NOPE"`)
rw.WriteHeader(http.StatusUnauthorized)
}
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
username, password, ok := r.BasicAuth()
if !ok {
respondUnauthorized(rw)
return
}
if !auther.Allowed(username, password) {
respondUnauthorized(rw)
return
}
h.ServeHTTP(rw, r)
})
}
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