89 lines
2.7 KiB
Go
89 lines
2.7 KiB
Go
/*
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* Copyright 2024 Jonas Kaninda
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package middlewares
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import (
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"fmt"
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"github.com/golang-jwt/jwt"
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"net/http"
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"time"
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)
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func (oauth Oauth) AuthMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if isProtectedPath(r.URL.Path, oauth.Paths) {
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oauthConf := oauth2Config(oauth)
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// Check if the user is authenticated
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token, err := r.Cookie("goma.oauth")
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if err != nil {
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// If no token, redirect to OAuth provider
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url := oauthConf.AuthCodeURL(oauth.State)
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http.Redirect(w, r, url, http.StatusTemporaryRedirect)
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return
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}
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ok, err := validateJWT(token.Value, oauth)
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if err != nil {
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// If no token, redirect to OAuth provider
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url := oauthConf.AuthCodeURL(oauth.State)
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http.Redirect(w, r, url, http.StatusTemporaryRedirect)
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return
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}
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if !ok {
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// If no token, redirect to OAuth provider
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url := oauthConf.AuthCodeURL(oauth.State)
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http.Redirect(w, r, url, http.StatusTemporaryRedirect)
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return
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}
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}
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// Token exists, proceed with request
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next.ServeHTTP(w, r)
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})
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}
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func validateJWT(signedToken string, oauth Oauth) (bool, error) {
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// Parse the JWT token and provide the key function
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token, err := jwt.Parse(signedToken, func(token *jwt.Token) (interface{}, error) {
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// Ensure the signing method is HMAC and specifically HS256
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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// Return the shared secret key for validation
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return []byte(oauth.JWTSecret), nil
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})
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// If there's an error or token is invalid, return false
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if err != nil || !token.Valid {
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return false, fmt.Errorf("token is invalid: %v", err)
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}
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// Check if token claims are valid
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if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
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// Optional: Check token expiration
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if exp, ok := claims["exp"].(float64); ok {
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if time.Unix(int64(exp), 0).Before(time.Now()) {
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return false, fmt.Errorf("token has expired")
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}
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}
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// Token is valid and not expired
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return true, nil
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}
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return false, fmt.Errorf("token is invalid or missing claims")
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}
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