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auth.go
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auth.go
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package auth
import (
"crypto/subtle"
"encoding/base64"
"errors"
"net/http"
"strconv"
"github.com/sohaha/zlsgo/zerror"
"github.com/sohaha/zlsgo/znet"
"github.com/sohaha/zlsgo/zstring"
)
const UserKey = "auth_user"
type (
Accounts map[string]string
authPairs []authPair
authPair struct {
value string
user string
}
)
func (a authPairs) searchCredential(authValue string) (string, bool) {
if authValue == "" {
return "", false
}
for _, pair := range a {
if subtle.ConstantTimeCompare(zstring.String2Bytes(pair.value), zstring.String2Bytes(authValue)) == 1 {
return pair.user, true
}
}
return "", false
}
func New(accounts Accounts) znet.Handler {
return BasicRealm(accounts, "")
}
func BasicRealm(accounts Accounts, realm string) znet.Handler {
if realm == "" {
realm = "Authorization Required"
}
realm = "Basic realm=" + strconv.Quote(realm)
pairs, err := processAccounts(accounts)
zerror.Panic(err)
return func(c *znet.Context) {
user, found := pairs.searchCredential(c.GetHeader("Authorization"))
if !found {
c.SetHeader("WWW-Authenticate", realm)
c.Abort(http.StatusUnauthorized)
return
}
c.WithValue(UserKey, user)
c.Next()
}
}
func processAccounts(accounts Accounts) (authPairs, error) {
length := len(accounts)
if length == 0 {
return nil, errors.New("empty list of authorized credentials")
}
pairs := make(authPairs, 0, length)
for user, password := range accounts {
if user == "" {
return nil, errors.New("user can not be empty")
}
value := authorizationHeader(user, password)
pairs = append(pairs, authPair{
value: value,
user: user,
})
}
return pairs, nil
}
func authorizationHeader(user, password string) string {
base := user + ":" + password
return "Basic " + base64.StdEncoding.EncodeToString(zstring.String2Bytes(base))
}