1 /*
2 * Copyright (c) 2002-2025, City of Paris
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice
10 * and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice
13 * and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * 3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 *
32 * License 1.0
33 */
34 package fr.paris.lutece.plugins.oauth2.jwt;
35
36 import java.security.Key;
37
38 import fr.paris.lutece.portal.service.util.AppException;
39 import fr.paris.lutece.util.httpaccess.HttpAccess;
40 import fr.paris.lutece.util.httpaccess.HttpAccessException;
41 import io.jsonwebtoken.JwsHeader;
42 import io.jsonwebtoken.LocatorAdapter;
43 import io.jsonwebtoken.security.JwkSet;
44 import io.jsonwebtoken.security.Jwks;
45
46 /**
47 * Key locator which fetches keys from a JWKS endpoint
48 */
49 public class KeyLocator extends LocatorAdapter<Key>
50 {
51 private final String _strJwksEndpointUri;
52 private final HttpAccess _httpAccess;
53
54 /**
55 * Constructs a Key Locator
56 *
57 * @param strJwksEndpointUri
58 * the URI of the JKWS resource
59 * @param httpAccess
60 * the httpAccess for fetching the file
61 */
62 public KeyLocator( String strJwksEndpointUri, HttpAccess httpAccess )
63 {
64 _strJwksEndpointUri = strJwksEndpointUri;
65 _httpAccess = httpAccess;
66 }
67
68 @Override
69 protected Key locate( JwsHeader header )
70 {
71 try
72 {
73 return getKey( header.getKeyId( ) );
74 }
75 catch( HttpAccessException e )
76 {
77 throw new AppException( e.getMessage( ), e );
78 }
79 }
80
81 private Key getKey( String keyId ) throws HttpAccessException
82 {
83 String jwks = _httpAccess.doGet( _strJwksEndpointUri );
84 JwkSet jwkSet = Jwks.setParser( ).build( ).parse( jwks );
85 return jwkSet.getKeys( ).stream( ).filter( k -> k.getId( ).equals( keyId ) ).map( k -> k.toKey( ) ).findFirst( ).orElse( null );
86 }
87
88 }