feat: Add about server page

lib/pages/settings_homeserver/settings_homeserver.dart

@@ -0,0 +1,58 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+
+import 'package:http/http.dart' as http;
+import 'package:matrix/matrix.dart';
+
+import '../../widgets/matrix.dart';
+import 'settings_homeserver_view.dart';
+
+class SettingsHomeserver extends StatefulWidget {
+  const SettingsHomeserver({super.key});
+
+  @override
+  SettingsHomeserverController createState() => SettingsHomeserverController();
+}
+
+class SettingsHomeserverController extends State<SettingsHomeserver> {
+  Future<({String name, String version, Uri federationBaseUrl})>
+      fetchServerInfo() async {
+    final client = Matrix.of(context).client;
+    final domain = client.userID!.domain!;
+    final httpClient = client.httpClient;
+    var federationBaseUrl = Uri(host: domain, port: 8448, scheme: 'https');
+    try {
+      final serverWellKnownResult = await httpClient.get(
+        Uri.https(domain, '/.well-known/matrix/server'),
+      );
+      final serverWellKnown = jsonDecode(serverWellKnownResult.body);
+      federationBaseUrl = Uri.https(serverWellKnown['m.server']);
+    } catch (e, s) {
+      Logs().w(
+        'Unable to fetch federation base uri. Use $federationBaseUrl',
+        e,
+        s,
+      );
+    }
+
+    final serverVersionResult = await http.get(
+      federationBaseUrl.resolveUri(
+        Uri(path: '/_matrix/federation/v1/version'),
+      ),
+    );
+    final {
+      'server': {
+        'name': String name,
+        'version': String version,
+      },
+    } = Map<String, Map<String, dynamic>>.from(
+      jsonDecode(serverVersionResult.body),
+    );
+
+    return (name: name, version: version, federationBaseUrl: federationBaseUrl);
+  }
+
+  @override
+  Widget build(BuildContext context) => SettingsHomeserverView(this);
+}