distribution/docs/handlers/basicauth_prego14.go

// +build !go1.4

package handlers

import (
	"encoding/base64"
	"net/http"
	"strings"
)

// NOTE(stevvooe): This is basic auth support from go1.4 present to ensure we
// can compile on go1.3 and earlier.

// BasicAuth returns the username and password provided in the request's
// Authorization header, if the request uses HTTP Basic Authentication.
// See RFC 2617, Section 2.
func basicAuth(r *http.Request) (username, password string, ok bool) {
	auth := r.Header.Get("Authorization")
	if auth == "" {
		return
	}
	return parseBasicAuth(auth)
}

// parseBasicAuth parses an HTTP Basic Authentication string.
// "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" returns ("Aladdin", "open sesame", true).
func parseBasicAuth(auth string) (username, password string, ok bool) {
	if !strings.HasPrefix(auth, "Basic ") {
		return
	}
	c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
	if err != nil {
		return
	}
	cs := string(c)
	s := strings.IndexByte(cs, ':')
	if s < 0 {
		return
	}
	return cs[:s], cs[s+1:], true
}