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jwt.go
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jwt.go
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package jwt
import (
"fmt"
"net/http"
"strings"
"github.com/dgrijalva/jwt-go/v4"
"github.com/alrusov/auth"
"github.com/alrusov/config"
"github.com/alrusov/log"
"github.com/alrusov/misc"
"github.com/alrusov/stdhttp"
)
//----------------------------------------------------------------------------------------------------------------------------//
type (
// AuthHandler --
AuthHandler struct {
http *stdhttp.HTTP
authCfg *config.Auth
cfg *config.AuthMethod
options *methodOptions
}
methodOptions struct {
Secret string `toml:"secret"`
LifetimeAccess config.Duration `toml:"lifetime-access"`
LifetimeRefresh config.Duration `toml:"lifetime-refresh"`
}
)
const (
module = "jwt"
method = "Bearer"
)
//----------------------------------------------------------------------------------------------------------------------------//
// Автоматическая регистрация при запуске приложения
func init() {
config.AddAuthMethod(module, &methodOptions{})
}
// Проверка валидности дополнительных опций метода
func (options *methodOptions) Check(cfg any) (err error) {
msgs := misc.NewMessages()
if options.Secret == "" {
msgs.Add(`%s.checkConfig: secret parameter isn't defined"`, module)
}
//if options.LifetimeAccess <= 0 {
// msgs.Add(`%s.checkConfig: illegal lifetime-access"`, module)
//}
//
//if options.LifetimeRefresh <= 0 {
// msgs.Add(`%s.checkConfig: illegal lifetime-refresh"`, module)
//}
err = msgs.Error()
return
}
//----------------------------------------------------------------------------------------------------------------------------//
// Init --
func (ah *AuthHandler) Init(cfg *config.Listener) (err error) {
ah.authCfg = nil
ah.cfg = nil
ah.options = nil
if ah.http != nil {
ah.http.AddHandler(ah, false)
ah.http.AddEndpointsInfo(
misc.StringMap{
"/tools/jwt/login": "Get jwt access and refresh tokens. Body: {\"username\": <username>, \"password\": <password>}",
"/tools/jwt/refresh": "Refresh jwt access and refresh tokens. Body: {\"refresh\": <refresh>}",
"/tools/jwt/verify": "verify jwt access or refresh tokens. Body: {\"token\": <token>}",
},
)
}
methodCfg, exists := cfg.Auth.Methods[module]
if !exists || !methodCfg.Enabled || methodCfg.Options == nil {
return nil
}
options, ok := methodCfg.Options.(*methodOptions)
if !ok {
return fmt.Errorf(`options for module "%s" is "%T", expected "%T"`, module, methodCfg.Options, options)
}
if options.Secret == "" {
return fmt.Errorf(`secret for module "%s" cannot be empty`, module)
}
if options.LifetimeAccess <= 0 {
options.LifetimeAccess = config.JWTdefaultLifetimeAccess
}
if options.LifetimeRefresh <= 0 {
options.LifetimeRefresh = config.JWTdefaultLifetimeRefresh
}
ah.authCfg = &cfg.Auth
ah.cfg = methodCfg
ah.options = options
return nil
}
//----------------------------------------------------------------------------------------------------------------------------//
// Add --
func Add(http *stdhttp.HTTP) (err error) {
return http.AddAuthHandler(
&AuthHandler{
http: http,
},
)
}
//----------------------------------------------------------------------------------------------------------------------------//
// Enabled --
func (ah *AuthHandler) Enabled() bool {
return ah.cfg != nil && ah.cfg.Enabled
}
//----------------------------------------------------------------------------------------------------------------------------//
// Score --
func (ah *AuthHandler) Score() int {
return ah.cfg.Score
}
//----------------------------------------------------------------------------------------------------------------------------//
// WWWAuthHeader --
func (ah *AuthHandler) WWWAuthHeader() (name string, withRealm bool) {
return method, false
}
//----------------------------------------------------------------------------------------------------------------------------//
// Check --
func (ah *AuthHandler) Check(id uint64, prefix string, path string, w http.ResponseWriter, r *http.Request) (identity *auth.Identity, tryNext bool, err error) {
if ah.options.Secret == "" {
return nil, true, nil
}
token := strings.SplitN(r.Header.Get(auth.Header), " ", 2)
if len(token) != 2 || token[0] != method {
return nil, true, nil
}
identity, err = CheckToken(token[1], "access", ah.options.Secret)
if identity != nil {
identity.Method = module
return identity, false, nil
}
auth.Log.Message(log.INFO, `[%d] JWT login error: %s`, id, err.Error())
return nil, false, err
}
//----------------------------------------------------------------------------------------------------------------------------//
// claims --
type claims struct {
jwt.StandardClaims `json:"-"`
User string `json:"username"`
Exp int64 `json:"exp"`
Type string `json:"type"`
}
// Valid --
func (c claims) Valid(v *jwt.ValidationHelper) error {
return nil
}
//----------------------------------------------------------------------------------------------------------------------------//
func CheckToken(tokenRaw, tokenType, secret string) (*auth.Identity, error) {
keyFunc := func(t *jwt.Token) (any, error) {
return []byte(secret), nil
}
claimsToken := jwt.MapClaims{}
_, err := jwt.ParseWithClaims(tokenRaw, claimsToken, keyFunc)
if err != nil {
return nil, err
}
tokenI, exists := claimsToken["type"]
if !exists {
return nil, fmt.Errorf(`the "type" claim is not found in the authorization header`)
}
token, _ := tokenI.(string)
if token != tokenType {
return nil, fmt.Errorf(`token "type" is not %s`, tokenType)
}
ui, exists := claimsToken["username"]
if !exists {
return nil, fmt.Errorf(`the "username" claim is not found in the authorization header`)
}
u, _ := ui.(string)
identity, err := auth.StdGetIdentity(u)
if err != nil {
return nil, err
}
if identity == nil {
return nil, fmt.Errorf(`unknown user "%s"`, u)
}
return identity, nil
}
// В теории является дубликатом CheckToken, не не знаю как лучше исправить
func ExtractToken(tokenRaw, secret string) (tokenType string, status bool, err error) {
status = false
keyFunc := func(t *jwt.Token) (any, error) {
return []byte(secret), nil
}
claimsToken := jwt.MapClaims{}
_, err = jwt.ParseWithClaims(tokenRaw, claimsToken, keyFunc)
if err == nil {
status = true
} else {
_, ok := err.(*jwt.TokenExpiredError)
if !ok {
return
}
}
tokenI, exists := claimsToken["type"]
if !exists {
err = fmt.Errorf(`the "type" claim is not found in the authorization header`)
return
}
tokenType, _ = tokenI.(string)
if tokenType != "access" && tokenType != "refresh" {
err = fmt.Errorf(`unknown token "type" - %s`, tokenType)
return
}
ui, exists := claimsToken["username"]
if !exists {
return "", false, fmt.Errorf(`the "username" claim is not found in the authorization header`)
}
u, _ := ui.(string)
identity, err := auth.StdGetIdentity(u)
if err != nil {
return "", false, err
}
if identity == nil {
return "", false, fmt.Errorf(`unknown user "%s"`, u)
}
return
}
//----------------------------------------------------------------------------------------------------------------------------//