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auth.go
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auth.go
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// Copyright (c) Autovia GmbH
// SPDX-License-Identifier: Apache-2.0
package structs
import (
"context"
"errors"
"fmt"
"net/http"
"github.com/autovia/flightdeck/api/utils"
jwt "github.com/golang-jwt/jwt/v5"
corev1 "k8s.io/api/core/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
const (
namespace = "flightdeck"
tokenSecret = "flightdeck-token"
tokenKey = "key"
)
type AuthManager interface {
Authorize(r *http.Request) (bool, string, error)
Secret() string
}
type authManager struct {
secret string
client *kubernetes.Clientset
}
type JwtCustomClaims struct {
Username string `json:"username"`
Token string `json:"token"`
jwt.RegisteredClaims
}
func (am *authManager) init() {
secret, err := am.client.CoreV1().Secrets(namespace).Get(context.TODO(), tokenSecret, metav1.GetOptions{})
if apierr.IsNotFound(err) {
newToken, err := utils.RandomString()
if err != nil {
panic(err)
}
_, err = am.client.CoreV1().Secrets(namespace).Create(context.TODO(), &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: tokenSecret}, StringData: map[string]string{tokenKey: newToken}}, metav1.CreateOptions{})
if err != nil {
panic(err)
}
am.secret = newToken
} else {
token := string(secret.Data[tokenKey])
if len(token) == 0 {
newToken, err := utils.RandomString()
if err != nil {
panic(err)
}
secret.StringData = map[string]string{tokenKey: newToken}
_, err = am.client.CoreV1().Secrets(namespace).Update(context.TODO(), secret, metav1.UpdateOptions{})
if err != nil {
panic(err)
}
am.secret = newToken
} else {
am.secret = token
}
}
}
func (am *authManager) Authorize(r *http.Request) (bool, string, error) {
cookie, err := r.Cookie("jwt")
if err != nil {
return false, "", errors.New("Authorization token missing")
}
token, err := jwt.ParseWithClaims(cookie.Value, &JwtCustomClaims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return []byte(am.secret), nil
})
if claims, ok := token.Claims.(*JwtCustomClaims); ok && token.Valid {
return true, claims.Token, nil
}
return false, "", err
}
func (am *authManager) Secret() string {
return am.secret
}
func NewAuthManager(k8s *kubernetes.Clientset) AuthManager {
am := &authManager{client: k8s}
am.init()
return am
}