updates to allow server communication

loc_chain_app/android/app/build.gradle

@@ -35,7 +35,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.loc_chain_app"
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

loc_chain_app/lib/main.dart

@@ -5,6 +5,7 @@ import 'package:loc_chain_app/widgets/navbar.dart';
 import 'package:flutter_udid/flutter_udid.dart';
 
 void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
   runApp(App());
   (await SharedPreferences.getInstance())
       .setString('userName', await FlutterUdid.consistentUdid);
@@ -14,11 +15,10 @@ class App extends StatelessWidget {
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
-    Connect.stop();
     Connect.start();
 
     return MaterialApp(
-      title: 'Flutter Demo',
+      title: 'Loc-Chain',
       theme: ThemeData(
         primarySwatch: Colors.lightBlue,
       ),

loc_chain_app/lib/pages/home.dart

@@ -78,4 +78,6 @@ class _HomePageState extends State<HomePage> {
       content: Text(a.toString()),
     ));
   }
+
+  Future<void> reportExposure() async {}
 }

loc_chain_app/lib/util/transaction_manager.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_udid/flutter_udid.dart';
 import 'package:loc_chain_app/util/keyfile_manager.dart';
 
@@ -19,3 +20,50 @@ class Transaction {
   Future<String> generateP2PPayload(String otherUserId) async =>
       "${await generateHash(otherUserId)}:${KeyFileManager.keyPair.publicKey}";
 }
+
+class EncounterTransaction {
+  EncounterTransaction({
+    required this.combinedHash,
+    required this.encodedGPSLocation,
+    required this.partnerPublicKey,
+    required this.validationSignature,
+  }) : timestamp = "${DateTime.now().millisecondsSinceEpoch}";
+  final String combinedHash;
+  final String timestamp;
+  final String encodedGPSLocation;
+  final String partnerPublicKey;
+  final String validationSignature;
+
+  EncounterTransaction.fromJson(Map<String, dynamic> json)
+      : combinedHash = json['combinedHash'],
+        timestamp = json['timestamp'],
+        encodedGPSLocation = json['encodedGPSLocation'],
+        partnerPublicKey = json['partnerPublicKey'],
+        validationSignature = json['validationSignature'];
+
+  Map<String, dynamic> toJson() => {
+        "combinedHash": combinedHash,
+        "timestamp": timestamp,
+        "encodedGPSLocation": encodedGPSLocation,
+        "partnerPublicKey": partnerPublicKey,
+        "validationSignature": validationSignature,
+      };
+}
+
+class ExposureTransaction {
+  final String clientID;
+  final String timestamp;
+
+  ExposureTransaction({
+    required this.clientID,
+  }) : timestamp = "${DateTime.now().millisecondsSinceEpoch}";
+
+  ExposureTransaction.fromJson(Map<String, dynamic> json)
+      : clientID = json['clientID'],
+        timestamp = json['timestamp'];
+
+  Map<String, dynamic> toJson() => {
+        "clientID": clientID,
+        "timestamp": timestamp,
+      };
+}

loc_chain_app/pubspec.lock

@@ -92,34 +92,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "6.1.0"
-  firebase_core:
-    dependency: transitive
-    description:
-      name: firebase_core
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.3"
-  firebase_core_platform_interface:
-    dependency: transitive
-    description:
-      name: firebase_core_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "4.0.0"
-  firebase_core_web:
-    dependency: transitive
-    description:
-      name: firebase_core_web
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.2"
-  firebase_database:
-    dependency: "direct main"
-    description:
-      name: firebase_database
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "6.1.2"
   fixnum:
     dependency: transitive
     description:
@@ -156,6 +128,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.3"
+  loading_animations:
+    dependency: "direct main"
+    description:
+      name: loading_animations
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.0"
   matcher:
     dependency: transitive
     description:
@@ -177,6 +156,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
+  openpgp:
+    dependency: "direct main"
+    description:
+      name: openpgp
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0-nullsafety.0"
   path:
     dependency: transitive
     description:

loc_chain_app/pubspec.yaml

@@ -34,7 +34,8 @@ dependencies:
   sqflite: ^2.0.0+3
   dbcrypt: ^2.0.0
   flutter_udid: ^2.0.0
-  firebase_database: ^6.1.2
+  loading_animations: ^2.2.0
+  openpgp: ^2.0.0-nullsafety.0
 
 dev_dependencies:
   flutter_test: