have export endpoint actually return a list of valid keys

Dynamically get a list of attributes to get the keys from, get their
values, ensure they are in a valid format using a regex and finally
return the list of keys as a JSON list.

Co-authored-by: kritzl <kritzl@kritzl.dev>

ssh-key-provider/src/main/java/de/ccc/hamburg/keycloak/ssh_key/AuthHelper.java

@@ -1,7 +1,7 @@
 package de.ccc.hamburg.keycloak.ssh_key;
 
-import jakarta.ws.rs.ForbiddenException;
+import java.util.function.Function;
-import jakarta.ws.rs.NotAuthorizedException;
+
 import org.keycloak.models.ClientModel;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
@@ -9,7 +9,8 @@ import org.keycloak.services.managers.AppAuthManager;
 import org.keycloak.services.managers.Auth;
 import org.keycloak.services.managers.AuthenticationManager;
 
-import java.util.function.Function;
+import jakarta.ws.rs.ForbiddenException;
+import jakarta.ws.rs.NotAuthorizedException;
 
 public class AuthHelper {
 
@@ -47,4 +48,4 @@ public class AuthHelper {
 		return new Auth(realm, authResult.getToken(), authResult.getUser(), client, authResult.getSession(), false);
 	}
 
-}
+}

ssh-key-provider/src/main/java/de/ccc/hamburg/keycloak/ssh_key/SSHKeyResourceProvider.java

@@ -1,27 +1,37 @@
 package de.ccc.hamburg.keycloak.ssh_key;
 
+import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
 import org.jboss.logging.Logger;
-import jakarta.ws.rs.GET;
-import jakarta.ws.rs.Path;
-import jakarta.ws.rs.PathParam;
-import jakarta.ws.rs.Produces;
-import jakarta.ws.rs.core.Response;
-import jakarta.ws.rs.core.MediaType;
 import org.keycloak.models.GroupModel;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
 import org.keycloak.models.UserModel;
 import org.keycloak.models.UserProvider;
-import org.keycloak.services.managers.Auth;
+import org.keycloak.representations.userprofile.config.UPConfig;
 import org.keycloak.services.resource.RealmResourceProvider;
+import org.keycloak.userprofile.UserProfileProvider;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.PathParam;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
 
 public class SSHKeyResourceProvider implements RealmResourceProvider {
     private static final Logger LOG = Logger.getLogger(SSHKeyResourceProvider.class);
     private final KeycloakSession session;
 
+    // taken from: https://github.com/nemchik/ssh-key-regex
+    private static final Pattern SSH_PUBLIC_KEY = Pattern.compile(
+            "^(?<key>(ssh-dss AAAAB3NzaC1kc3|ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNT|ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzOD|ecdsa-sha2-nistp521 AAAAE2VjZHNhLXNoYTItbmlzdHA1Mj|sk-ecdsa-sha2-nistp256@openssh.com AAAAInNrLWVjZHNhLXNoYTItbmlzdHAyNTZAb3BlbnNzaC5jb2|ssh-ed25519 AAAAC3NzaC1lZDI1NTE5|sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29t|ssh-rsa AAAAB3NzaC1yc2)[0-9A-Za-z+/]+[=]{0,3})(\\s.*)?$");
+
     public SSHKeyResourceProvider(KeycloakSession keycloakSession) {
         this.session = keycloakSession;
     }
@@ -40,26 +50,43 @@ public class SSHKeyResourceProvider implements RealmResourceProvider {
     @Produces(MediaType.APPLICATION_JSON)
     public Response exportKeys(@PathParam("group_id") String groupId) {
         UserProvider userProvider = session.users();
+        UserProfileProvider profileProvider = session.getProvider(UserProfileProvider.class);
+        UPConfig upconfig = profileProvider.getConfiguration();
+
+        Stream<String> attributeNames = upconfig.getAttributes()
+                .stream()
+                .filter(a -> a.getGroup() != null && a.getGroup().equals("de.ccc.hamburg.keycloak.ssh_key.keys"))
+                .map(a -> a.getName());
 
         try {
-            Auth auth = AuthHelper.getAuth(session,
+            AuthHelper.getAuth(
+                    session,
                     authResult -> authResult.getToken().getIssuedFor().equals("admin-cli"));
 
             RealmModel realm = session.getContext().getRealm();
+
             // TODO: add allowlist check
             GroupModel group = realm.getGroupById(groupId);
 
-            LOG.info(String.format("Getting Users from Group \"%s\" with ID %s", group.getName(), group.getId()));
-
             Stream<UserModel> users = userProvider.getGroupMembersStream(realm, group);
 
-            users.forEach(user -> {
+            List<String> keys = users
-                String sshKey = user.getAttributeStream("ssh-key-1").findFirst().get();
+                    .map(user -> {
-                LOG.info(String.format("SSH Key of %s: %s", user.getUsername(), sshKey));
+                        return attributeNames
-            });
+                            .map(attributeName -> user.getAttributeStream(attributeName).findFirst())
+                            .filter(attribute -> attribute.isPresent())
+                            .map(attribute -> attribute.get())
+                            .toList();
+                    })
+                    .flatMap(List::stream)
+                    .map(key -> {
+                        final Matcher matcher = SSH_PUBLIC_KEY.matcher(key);
+                        return matcher.find() ? matcher.group("key") : null;
+                    })
+                    .filter(Objects::nonNull)
+                    .toList();
 
-
+            return Response.ok(Map.of("keys", keys)).build();
-            return Response.ok(Map.of("hello", auth.getUser().getUsername())).build();
         } catch (Exception e) {
             System.err.println(e);
             return Response.status(401, e.getMessage()).build();

ssh-key-provider/src/main/java/de/ccc/hamburg/keycloak/ssh_key/SSHKeyResourceProviderFactory.java

@@ -1,11 +1,12 @@
 package de.ccc.hamburg.keycloak.ssh_key;
 
+import org.keycloak.Config;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.KeycloakSessionFactory;
 import org.keycloak.services.resource.RealmResourceProvider;
 import org.keycloak.services.resource.RealmResourceProviderFactory;
+
 import com.google.auto.service.AutoService;
-import org.keycloak.Config;
 
 @AutoService(RealmResourceProviderFactory.class)
 public class SSHKeyResourceProviderFactory implements RealmResourceProviderFactory {