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basic.go
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basic.go
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package auth
import (
"encoding/base64"
"github.com/go-martini/martini"
"net/http"
"strings"
)
// User is the authenticated username that was extracted from the request.
type User string
// BasicRealm is used when setting the WWW-Authenticate response header.
var BasicRealm = "Authorization Required"
// Basic returns a Handler that authenticates via Basic Auth. Writes a http.StatusUnauthorized
// if authentication fails.
func Basic(username string, password string) martini.Handler {
var siteAuth = base64.StdEncoding.EncodeToString([]byte(username + ":" + password))
return func(res http.ResponseWriter, req *http.Request, c martini.Context) {
auth := req.Header.Get("Authorization")
if !SecureCompare(auth, "Basic "+siteAuth) {
unauthorized(res)
return
}
c.Map(User(username))
}
}
// BasicFunc returns a Handler that authenticates via Basic Auth using the provided function.
// The function should return true for a valid username/password combination.
func BasicFunc(authfn func(string, string) bool) martini.Handler {
return func(res http.ResponseWriter, req *http.Request, c martini.Context) {
auth := req.Header.Get("Authorization")
if len(auth) < 6 || auth[:6] != "Basic " {
unauthorized(res)
return
}
b, err := base64.StdEncoding.DecodeString(auth[6:])
if err != nil {
unauthorized(res)
return
}
tokens := strings.SplitN(string(b), ":", 2)
if len(tokens) != 2 || !authfn(tokens[0], tokens[1]) {
unauthorized(res)
return
}
c.Map(User(tokens[0]))
}
}
func unauthorized(res http.ResponseWriter) {
res.Header().Set("WWW-Authenticate", "Basic realm=\""+BasicRealm+"\"")
http.Error(res, "Not Authorized", http.StatusUnauthorized)
}