✨ Handle risk detection

lib/i18n/app_en.arb

@@ -3,9 +3,11 @@
   "explore": "Explore",
   "chat": "Chat",
   "account": "Account",
+  "riskDetection": "Risk Detection",
   "signIn": "Sign In",
   "signInCaption": "Sign in to create post, start a realm, message your friend and more!",
   "signInRequired": "Sign in required",
+  "signInRiskDetected": "Risk detected, click Next to open a webpage and signin through it to pass security check.",
   "signUp": "Sign Up",
   "signUpCaption": "Create an account on Solarpass and then get the access of entire Solar Networks!",
   "poweredBy": "Powered by Project Hydrogen",

lib/i18n/app_zh.arb

@@ -3,9 +3,11 @@
   "explore": "探索",
   "chat": "聊天",
   "account": "账号",
+  "riskDetection": "风险监测",
   "signIn": "登陆",
   "signInCaption": "登陆以发表帖子、文章、创建领域、和你的朋友聊天，以及获取更多功能！",
   "signInRequired": "请先登陆",
+  "signInRiskDetected": "检测到风险，点击下一步按钮来打开一个网页，并通过在其上面登陆来通过安全检查。",
   "signUp": "注册",
   "signUpCaption": "在 Solarpass 注册一个账号以获得整个 Solar Networks 的存取权！",
   "poweredBy": "由 Project Hydrogen 强力驱动",

lib/screens/signin.dart

@@ -3,7 +3,9 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:provider/provider.dart';
 import 'package:solian/providers/auth.dart';
 import 'package:solian/router.dart';
+import 'package:solian/utils/service_url.dart';
 import 'package:solian/widgets/indent_wrapper.dart';
+import 'package:url_launcher/url_launcher_string.dart';
 
 class SignInScreen extends StatelessWidget {
   final _usernameController = TextEditingController();
@@ -59,9 +61,33 @@ class SignInScreen extends StatelessWidget {
                   auth.signin(context, username, password).then((_) {
                     router.pop(true);
                   }).catchError((e) {
-                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
-                      content: Text(e.toString()),
-                    ));
+                    List<String> messages = e.toString().split('\n');
+                    if (messages.last.contains("risk")) {
+                      showDialog(
+                        context: context,
+                        builder: (context) {
+                          return AlertDialog(
+                            title: Text(AppLocalizations.of(context)!.riskDetection),
+                            content: Text(AppLocalizations.of(context)!.signInRiskDetected),
+                            actions: [
+                              TextButton(
+                                child: Text(AppLocalizations.of(context)!.next),
+                                onPressed: () {
+                                  launchUrlString(getRequestUri('passport', '/sign-in').toString());
+                                  if (Navigator.canPop(context)) {
+                                    Navigator.pop(context);
+                                  }
+                                },
+                              )
+                            ],
+                          );
+                        },
+                      );
+                    } else {
+                      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text(messages.last),
+                      ));
+                    }
                   });
                 },
               )