Validate base_url and server_name (#13941)

* Validate base_url and server_name

* Fix style

* add return types

LibreNMS/Validations/WebServer.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * WebServer.php
+ *
+ * -Description-
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * @link       https://www.librenms.org
+ *
+ * @copyright  2022 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Validations;
+
+use Illuminate\Support\Str;
+use LibreNMS\Config;
+use LibreNMS\Validator;
+
+class WebServer extends BaseValidation
+{
+    /**
+     * @inheritDoc
+     */
+    public function validate(Validator $validator): void
+    {
+        if (! app()->runningInConsole()) {
+            $url = request()->url();
+            $expected = Str::finish(Config::get('base_url'), '/') . 'validate/results';
+            if ($url !== $expected) {
+                preg_match('#://([^/]+)/#', $url, $actual_host_match);
+                preg_match('#://([^/]+)/#', $expected, $expected_host_match);
+                $actual_host = $actual_host_match[1];
+                if ($actual_host != $expected_host_match[1]) {
+                    $nginx = Str::startsWith(request()->server->get('SERVER_SOFTWARE'), 'nginx');
+                    $server_name = $nginx ? 'server_name' : 'ServerName';
+                    $fix = $nginx ? "server_name $actual_host;" : "ServerName $actual_host";
+                    $validator->fail("$server_name is set incorrectly for your webserver, update your webserver config.", $fix);
+                } else {
+                    $correct_base = str_replace('validate/results', '', $url);
+                    $validator->fail('base_url is not set correctly', "lnms config:set base_url $correct_base");
+                }
+            }
+        }
+    }
+
+    public function isDefault(): bool
+    {
+        return ! app()->runningInConsole();
+    }
+}