Add the ability to change the server URL on signup & profile page

TODO: Change server URL on login. This will only affect new devices with
existing users, so will be done later.

Backend/Database/Init.go

@@ -10,13 +10,14 @@ import (
 )
 
 const (
-	dbUrl     = "postgres://postgres:@localhost:5432/envelope"
-	dbTestUrl = "postgres://postgres:@localhost:5432/envelope_test"
+	dbURL     = "postgres://postgres:@localhost:5432/envelope"
+	dbTestURL = "postgres://postgres:@localhost:5432/envelope_test"
 )
 
+// DB db
 var DB *gorm.DB
 
-func GetModels() []interface{} {
+func getModels() []interface{} {
 	return []interface{}{
 		&Models.Session{},
 		&Models.User{},
@@ -29,6 +30,7 @@ func GetModels() []interface{} {
 	}
 }
 
+// Init initializes the database connection
 func Init() {
 	var (
 		model interface{}
@@ -37,7 +39,7 @@ func Init() {
 
 	log.Println("Initializing database...")
 
-	DB, err = gorm.Open(postgres.Open(dbUrl), &gorm.Config{})
+	DB, err = gorm.Open(postgres.Open(dbURL), &gorm.Config{})
 
 	if err != nil {
 		log.Fatalln(err)
@@ -45,24 +47,28 @@ func Init() {
 
 	log.Println("Running AutoMigrate...")
 
-	for _, model = range GetModels() {
-		DB.AutoMigrate(model)
+	for _, model = range getModels() {
+		err = DB.AutoMigrate(model)
+		if err != nil {
+			log.Fatalln(err)
+		}
 	}
 }
 
+// InitTest initializes the test datbase
 func InitTest() {
 	var (
 		model interface{}
 		err   error
 	)
 
-	DB, err = gorm.Open(postgres.Open(dbTestUrl), &gorm.Config{})
+	DB, err = gorm.Open(postgres.Open(dbTestURL), &gorm.Config{})
 
 	if err != nil {
 		log.Fatalln(err)
 	}
 
-	for _, model = range GetModels() {
+	for _, model = range getModels() {
 		DB.Migrator().DropTable(model)
 		DB.AutoMigrate(model)
 	}

Backend/Database/Seeder/MessageSeeder.go

@@ -298,7 +298,7 @@ func SeedMessages() {
 		panic(err)
 	}
 
-	for i = 0; i <= 20; i++ {
+	for i = 0; i <= 100; i++ {
 		err = seedMessage(
 			primaryUser,
 			secondaryUser,

Backend/Models/Messages.go

@@ -1,12 +1,14 @@
 package Models
 
 import (
+	"database/sql"
 	"time"
 
 	"github.com/gofrs/uuid"
 )
 
-// TODO: Add support for images
+// MessageData holds the content of the message
+// encrypted through the Message.SymmetricKey
 type MessageData struct {
 	Base
 	Data         string `gorm:"not null" json:"data"`          // Stored encrypted
@@ -14,11 +16,13 @@ type MessageData struct {
 	SymmetricKey string `gorm:"not null" json:"symmetric_key"` // Stored encrypted
 }
 
+// Message holds data pertaining to each users' message
 type Message struct {
 	Base
-	MessageDataID  uuid.UUID   `json:"message_data_id"`
-	MessageData    MessageData `json:"message_data"`
-	SymmetricKey   string      `json:"symmetric_key"   gorm:"not null"` // Stored encrypted
-	AssociationKey string      `json:"association_key" gorm:"not null"` // TODO: This links all encrypted messages for a user in a thread together. Find a way to fix this
-	CreatedAt      time.Time   `json:"created_at"      gorm:"not null"`
+	MessageDataID  uuid.UUID    `                       json:"message_data_id"`
+	MessageData    MessageData  `                       json:"message_data"`
+	SymmetricKey   string       `gorm:"not null"        json:"symmetric_key"`   // Stored encrypted
+	AssociationKey string       `gorm:"not null"        json:"association_key"` // Stored encrypted
+	Expiry         sql.NullTime `                       json:"expiry"`
+	CreatedAt      time.Time    `gorm:"not null"        json:"created_at"`
 }

Backend/Models/Users.go

@@ -1,10 +1,12 @@
 package Models
 
 import (
+	"database/sql/driver"
+
 	"gorm.io/gorm"
 )
 
-// Prevent updating the email if it has not changed
+// BeforeUpdate prevents updating the email if it has not changed
 // This stops a unique constraint error
 func (u *User) BeforeUpdate(tx *gorm.DB) (err error) {
 	if !tx.Statement.Changed("Username") {
@@ -13,11 +15,49 @@ func (u *User) BeforeUpdate(tx *gorm.DB) (err error) {
 	return nil
 }
 
+// MessageExpiry holds values for how long messages should expire by default
+type MessageExpiry []uint8
+
+const (
+	// MessageExpiryFifteenMin expires after 15 minutes
+	MessageExpiryFifteenMin = "fifteen_min"
+	// MessageExpiryThirtyMin expires after 30 minutes
+	MessageExpiryThirtyMin = "thirty_min"
+	// MessageExpiryOneHour expires after one hour
+	MessageExpiryOneHour = "one_hour"
+	// MessageExpiryThreeHour expires after three hours
+	MessageExpiryThreeHour = "three_hour"
+	// MessageExpirySixHour expires after six hours
+	MessageExpirySixHour = "six_hour"
+	// MessageExpiryTwelveHour expires after twelve hours
+	MessageExpiryTwelveHour = "twelve_hour"
+	// MessageExpiryOneDay expires after one day
+	MessageExpiryOneDay = "one_day"
+	// MessageExpiryThreeDay expires after three days
+	MessageExpiryThreeDay = "three_day"
+	// MessageExpiryNoExpiry never expires
+	MessageExpiryNoExpiry = "no_expiry"
+)
+
+// Scan new value into MessageExpiry
+func (e *MessageExpiry) Scan(value interface{}) error {
+	*e = MessageExpiry(value.(string))
+	return nil
+}
+
+// Value gets value out of MessageExpiry column
+func (e MessageExpiry) Value() (driver.Value, error) {
+	return string(e), nil
+}
+
+// User holds user data
 type User struct {
 	Base
-	Username             string `gorm:"not null;unique" json:"username"`
-	Password             string `gorm:"not null"        json:"password"`
-	ConfirmPassword      string `gorm:"-"               json:"confirm_password"`
-	AsymmetricPrivateKey string `gorm:"not null"        json:"asymmetric_private_key"` // Stored encrypted
-	AsymmetricPublicKey  string `gorm:"not null"        json:"asymmetric_public_key"`
+	Username             string        `gorm:"not null;unique"   json:"username"`
+	Password             string        `gorm:"not null"          json:"password"`
+	ConfirmPassword      string        `gorm:"-"                 json:"confirm_password"`
+	AsymmetricPrivateKey string        `gorm:"not null"          json:"asymmetric_private_key"` // Stored encrypted
+	AsymmetricPublicKey  string        `gorm:"not null"          json:"asymmetric_public_key"`
+	MessageExpiryDefault MessageExpiry `gorm:"default:no_expiry" json:"message_expiry_default" sql:"type:ENUM('fifteen_min', 'thirty_min', 'one_hour', 'three_hour', 'six_hour', 'twelve_hour', 'one_day', 'three_day')"` // Stored encrypted
+
 }

mobile/lib/components/qr_reader.dart

@@ -1,9 +1,7 @@
 import 'dart:convert';
 import 'dart:io';
 
-import 'package:Envelope/utils/storage/session_cookie.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:pointycastle/impl.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
 import 'package:sqflite/sqflite.dart';
@@ -16,6 +14,7 @@ import '/utils/encryption/aes_helper.dart';
 import '/utils/encryption/crypto_utils.dart';
 import '/utils/storage/database.dart';
 import '/utils/strings.dart';
+import '/utils/storage/session_cookie.dart';
 import 'flash_message.dart';
 
 class QrReader extends StatefulWidget {
@@ -128,7 +127,7 @@ class _QrReaderState extends State<QrReader> {
     ]);
 
     var resp = await http.post(
-      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/friend_request/qr_code'),
+      await MyProfile.getServerUrl('api/v1/auth/friend_request/qr_code'),
       headers: <String, String>{
         'Content-Type': 'application/json; charset=UTF-8',
         'cookie': await getSessionCookie(),

mobile/lib/components/user_search_result.dart

@@ -119,7 +119,7 @@ class _UserSearchResultState extends State<UserSearchResult>{
     });
 
     var resp = await http.post(
-        Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/friend_request'),
+        await MyProfile.getServerUrl('api/v1/auth/friend_request'),
         headers: {
           'cookie': await getSessionCookie(),
         },

mobile/lib/main.dart

@@ -50,6 +50,7 @@ class MyApp extends StatelessWidget {
           primaryColor: Colors.orange.shade900,
           backgroundColor: Colors.grey.shade800,
           scaffoldBackgroundColor: Colors.grey[850],
+          disabledColor: Colors.grey[400],
           colorScheme: ColorScheme(
               brightness: Brightness.dark,
               primary: Colors.orange.shade900,

mobile/lib/models/my_profile.dart

@@ -1,9 +1,16 @@
 import 'dart:convert';
-import 'package:Envelope/utils/encryption/aes_helper.dart';
-import 'package:Envelope/utils/encryption/crypto_utils.dart';
+
+import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:pointycastle/impl.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import '/utils/encryption/aes_helper.dart';
+import '/utils/encryption/crypto_utils.dart';
+
+// TODO: Replace this with the prod url when server is deployed
+String defaultServerUrl = dotenv.env['SERVER_URL'] ?? 'http://192.168.1.5:8080';
+
+
 class MyProfile {
   String id;
   String username;
@@ -107,5 +114,22 @@ class MyProfile {
     }
     return profile.privateKey!;
   }
+
+  static setServerUrl(String url) async {
+    final preferences = await SharedPreferences.getInstance();
+    preferences.setString('server_url', url);
+  }
+
+  static Future<Uri> getServerUrl(String path) async {
+    final preferences = await SharedPreferences.getInstance();
+
+    String? baseUrl = preferences.getString('server_url');
+    if (baseUrl == null) {
+      setServerUrl(defaultServerUrl);
+      return Uri.parse('$defaultServerUrl$path');
+    }
+
+    return Uri.parse('$baseUrl$path');
+  }
 }
 

mobile/lib/utils/storage/conversations.dart

@@ -1,12 +1,11 @@
 import 'dart:convert';
 
-import 'package:Envelope/components/flash_message.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 import 'package:pointycastle/export.dart';
 import 'package:sqflite/sqflite.dart';
 
+import '/components/flash_message.dart';
 import '/models/conversation_users.dart';
 import '/models/conversations.dart';
 import '/models/my_profile.dart';
@@ -20,7 +19,7 @@ Future<void> updateConversation(Conversation conversation, { includeUsers = true
   Map<String, dynamic> conversationJson = await conversation.payloadJson(includeUsers: includeUsers);
 
   var x = await http.put(
-    Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/conversations'),
+    await MyProfile.getServerUrl('api/v1/auth/conversations'),
     headers: <String, String>{
       'Content-Type': 'application/json; charset=UTF-8',
       'cookie': sessionCookie,
@@ -38,7 +37,7 @@ Future<void> updateConversations() async {
 
   // try {
     var resp = await http.get(
-      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/conversations'),
+      await MyProfile.getServerUrl('api/v1/auth/conversations'),
       headers: {
         'cookie': await getSessionCookie(),
       }
@@ -68,7 +67,7 @@ Future<void> updateConversations() async {
 
     Map<String, String> params = {};
     params['conversation_detail_ids'] = conversationsDetailIds.join(',');
-    var uri = Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/conversation_details');
+    var uri = await MyProfile.getServerUrl('api/v1/auth/conversation_details');
     uri = uri.replace(queryParameters: params);
 
     resp = await http.get(
@@ -150,7 +149,7 @@ Future<void> uploadConversation(Conversation conversation, BuildContext context)
   Map<String, dynamic> conversationJson = await conversation.payloadJson();
 
   var resp = await http.post(
-    Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/conversations'),
+    await MyProfile.getServerUrl('api/v1/auth/conversations'),
     headers: <String, String>{
       'Content-Type': 'application/json; charset=UTF-8',
       'cookie': sessionCookie,

mobile/lib/utils/storage/friends.dart

@@ -1,6 +1,5 @@
 import 'dart:convert';
 
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 import 'package:pointycastle/export.dart';
 import 'package:sqflite/sqflite.dart';
@@ -15,7 +14,7 @@ Future<void> updateFriends() async {
 
   // try {
     var resp = await http.get(
-        Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/friend_requests'),
+        await MyProfile.getServerUrl('api/v1/auth/friend_requests'),
         headers: {
           'cookie': await getSessionCookie(),
         }

mobile/lib/utils/storage/messages.dart

@@ -1,6 +1,5 @@
 import 'dart:convert';
 
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 import 'package:sqflite/sqflite.dart';
 import 'package:uuid/uuid.dart';
@@ -43,9 +42,9 @@ Future<void> sendMessage(Conversation conversation, String data) async {
   String sessionCookie = await getSessionCookie();
 
   message.payloadJson(conversation, messageId)
-      .then((messageJson) {
+      .then((messageJson) async {
         return http.post(
-            Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/message'),
+            await MyProfile.getServerUrl('api/v1/auth/message'),
             headers: <String, String>{
               'Content-Type': 'application/json; charset=UTF-8',
               'cookie': sessionCookie,
@@ -75,7 +74,7 @@ Future<void> updateMessageThread(Conversation conversation, {MyProfile? profile}
   ConversationUser currentUser = await getConversationUser(conversation, profile.id);
 
   var resp = await http.get(
-      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/messages/${currentUser.associationKey}'),
+      await MyProfile.getServerUrl('api/v1/auth/messages/${currentUser.associationKey}'),
       headers: {
         'cookie': await getSessionCookie(),
       }

mobile/lib/views/authentication/login.dart

@@ -1,7 +1,9 @@
 import 'dart:convert';
+
 import 'package:flutter/material.dart';
 import 'package:http/http.dart' as http;
-import 'package:flutter_dotenv/flutter_dotenv.dart';
+
+import '/components/flash_message.dart';
 import '/models/my_profile.dart';
 import '/utils/storage/session_cookie.dart';
 
@@ -34,51 +36,26 @@ class LoginResponse {
   }
 }
 
-Future<dynamic> login(context, String username, String password) async {
-  final resp = await http.post(
-      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/login'),
-      headers: <String, String>{
-        'Content-Type': 'application/json; charset=UTF-8',
-      },
-      body: jsonEncode(<String, String>{
-        'username': username,
-        'password': password,
-      }),
-  );
-
-  if (resp.statusCode != 200) {
-    throw Exception(resp.body);
-  }
-
-  String? rawCookie = resp.headers['set-cookie'];
-  if (rawCookie != null) {
-    int index = rawCookie.indexOf(';');
-    setSessionCookie((index == -1) ? rawCookie : rawCookie.substring(0, index));
-  }
-
-  return await MyProfile.login(json.decode(resp.body), password);
-}
-
 class Login extends StatelessWidget {
   const Login({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-        appBar: AppBar(
-            title: null,
-            automaticallyImplyLeading: true,
-            leading: IconButton(icon: const Icon(Icons.arrow_back),
-                onPressed:() => {
-                  Navigator.pop(context)
-                }
-            ),
-            backgroundColor: Colors.transparent,
-            shadowColor: Colors.transparent,
-        ),
-        body: const SafeArea(
-            child: LoginWidget(),
+      appBar: AppBar(
+        title: null,
+        automaticallyImplyLeading: true,
+        leading: IconButton(icon: const Icon(Icons.arrow_back),
+          onPressed:() => {
+            Navigator.pop(context)
+          }
         ),
+        backgroundColor: Colors.transparent,
+        shadowColor: Colors.transparent,
+      ),
+      body: const SafeArea(
+        child: LoginWidget(),
+      ),
     );
   }
 }
@@ -93,125 +70,154 @@ class LoginWidget extends StatefulWidget {
 class _LoginWidgetState extends State<LoginWidget> {
   final _formKey = GlobalKey<FormState>();
 
-  TextEditingController usernameController = TextEditingController();
-  TextEditingController passwordController = TextEditingController();
+  final TextEditingController _usernameController = TextEditingController();
+  final TextEditingController _passwordController = TextEditingController();
 
   @override
   Widget build(BuildContext context) {
     const TextStyle inputTextStyle = TextStyle(
-        fontSize: 18,
+      fontSize: 18,
     );
 
     final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
-        borderRadius: BorderRadius.circular(5),
-        borderSide: const BorderSide(
-            color: Colors.transparent,
-        )
+      borderRadius: BorderRadius.circular(5),
+      borderSide: const BorderSide(
+        color: Colors.transparent,
+      )
     );
 
     final ButtonStyle buttonStyle = ElevatedButton.styleFrom(
-        primary: Theme.of(context).colorScheme.surface,
-        onPrimary: Theme.of(context).colorScheme.onSurface,
-        minimumSize: const Size.fromHeight(50),
-        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
-        textStyle: TextStyle(
-            fontSize: 20,
-            fontWeight: FontWeight.bold,
-            color: Theme.of(context).colorScheme.error,
-        ),
+      primary: Theme.of(context).colorScheme.surface,
+      onPrimary: Theme.of(context).colorScheme.onSurface,
+      minimumSize: const Size.fromHeight(50),
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
+      textStyle: TextStyle(
+        fontSize: 20,
+        fontWeight: FontWeight.bold,
+        color: Theme.of(context).colorScheme.error,
+      ),
     );
 
     return Center(
-        child: Form(
-            key: _formKey,
-            child: Center(
-                child: Padding(
-                    padding: const EdgeInsets.only(
-                        left: 20,
-                        right: 20,
-                        top: 0,
-                        bottom: 80,
-                    ),
-                    child: Column(
-                        mainAxisAlignment: MainAxisAlignment.center,
-                        crossAxisAlignment: CrossAxisAlignment.center,
-                        children: [
-                          Text(
-                              'Login',
-                              style: TextStyle(
-                                  fontSize: 35,
-                                  color: Theme.of(context).colorScheme.onBackground,
-                              ),
-                          ),
-                          const SizedBox(height: 30),
-                          TextFormField(
-                              controller: usernameController,
-                              decoration: InputDecoration(
-                                  hintText: 'Username',
-                                  enabledBorder: inputBorderStyle,
-                                  focusedBorder: inputBorderStyle,
-                              ),
-                              style: inputTextStyle,
-                              // The validator receives the text that the user has entered.
-                              validator: (value) {
-                                if (value == null || value.isEmpty) {
-                                  return 'Enter a username';
-                                }
-                                return null;
-                              },
-                          ),
-                          const SizedBox(height: 10),
-                          TextFormField(
-                              controller: passwordController,
-                              obscureText: true,
-                              enableSuggestions: false,
-                              autocorrect: false,
-                              decoration: InputDecoration(
-                                  hintText: 'Password',
-                                  enabledBorder: inputBorderStyle,
-                                  focusedBorder: inputBorderStyle,
-                              ),
-                              style: inputTextStyle,
-                              // The validator receives the text that the user has entered.
-                              validator: (value) {
-                                if (value == null || value.isEmpty) {
-                                  return 'Enter a password';
-                                }
-                                return null;
-                              },
-                          ),
-                          const SizedBox(height: 15),
-                          ElevatedButton(
-                              style: buttonStyle,
-                              onPressed: () {
-                                if (_formKey.currentState!.validate()) {
-                                  ScaffoldMessenger.of(context).showSnackBar(
-                                      const SnackBar(content: Text('Processing Data')),
-                                  );
-
-                                  login(
-                                      context,
-                                      usernameController.text,
-                                      passwordController.text,
-                                  ).then((val) {
-                                    Navigator.
-                                        pushNamedAndRemoveUntil(
-                                            context,
-                                            '/home',
-                                            ModalRoute.withName('/home'),
-                                        );
-                                  }).catchError((error) {
-                                    print(error); // TODO: Show error on interface
-                                  });
-                                }
-                              },
-                              child: const Text('Submit'),
-                          ),
-                      ],
-                  )
-              )
+      child: Form(
+        key: _formKey,
+        child: Center(
+          child: Padding(
+            padding: const EdgeInsets.only(
+              left: 20,
+              right: 20,
+              top: 0,
+              bottom: 80,
+            ),
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              crossAxisAlignment: CrossAxisAlignment.center,
+              children: [
+                Text(
+                  'Login',
+                  style: TextStyle(
+                    fontSize: 35,
+                    color: Theme.of(context).colorScheme.onBackground,
+                  ),
+                ),
+                const SizedBox(height: 30),
+                TextFormField(
+                  controller: _usernameController,
+                  decoration: InputDecoration(
+                    hintText: 'Username',
+                    enabledBorder: inputBorderStyle,
+                    focusedBorder: inputBorderStyle,
+                  ),
+                  style: inputTextStyle,
+                  // The validator receives the text that the user has entered.
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Enter a username';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 10),
+                TextFormField(
+                  controller: _passwordController,
+                  obscureText: true,
+                  enableSuggestions: false,
+                  autocorrect: false,
+                  decoration: InputDecoration(
+                    hintText: 'Password',
+                    enabledBorder: inputBorderStyle,
+                    focusedBorder: inputBorderStyle,
+                  ),
+                  style: inputTextStyle,
+                  // The validator receives the text that the user has entered.
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Enter a password';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 15),
+                ElevatedButton(
+                  style: buttonStyle,
+                  onPressed: () {
+                    if (_formKey.currentState!.validate()) {
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        const SnackBar(content: Text('Processing Data')),
+                      );
+
+                      login()
+                        .then((val) {
+                          Navigator.
+                            pushNamedAndRemoveUntil(
+                              context,
+                              '/home',
+                              ModalRoute.withName('/home'),
+                            );
+                        }).catchError((error) {
+                          showMessage(
+                            'Could not login to Envelope, please try again later.',
+                            context,
+                          );
+                        });
+                    }
+                  },
+                  child: const Text('Submit'),
+                ),
+              ],
+            )
           )
+        )
       )
     );
   }
+
+
+  Future<dynamic> login() async {
+    final resp = await http.post(
+      await MyProfile.getServerUrl('api/v1/login'),
+      headers: <String, String>{
+        'Content-Type': 'application/json; charset=UTF-8',
+      },
+      body: jsonEncode(<String, String>{
+        'username': _usernameController.text,
+        'password': _passwordController.text,
+      }),
+    );
+
+    if (resp.statusCode != 200) {
+      throw Exception(resp.body);
+    }
+
+    String? rawCookie = resp.headers['set-cookie'];
+    if (rawCookie != null) {
+      int index = rawCookie.indexOf(';');
+      setSessionCookie((index == -1) ? rawCookie : rawCookie.substring(0, index));
+    }
+
+    return await MyProfile.login(
+      json.decode(resp.body),
+      _passwordController.text,
+    );
+  }
 }

mobile/lib/views/authentication/signup.dart

@@ -1,44 +1,14 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
+import 'package:Envelope/components/flash_message.dart';
+import 'package:Envelope/models/my_profile.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 
 import '/utils/encryption/aes_helper.dart';
 import '/utils/encryption/crypto_utils.dart';
 
-Future<SignupResponse> signUp(context, String username, String password, String confirmPassword) async {
-  var keyPair = CryptoUtils.generateRSAKeyPair();
-
-  var rsaPubPem = CryptoUtils.encodeRSAPublicKeyToPem(keyPair.publicKey);
-  var rsaPrivPem = CryptoUtils.encodeRSAPrivateKeyToPem(keyPair.privateKey);
-
-  String encRsaPriv = AesHelper.aesEncrypt(password, Uint8List.fromList(rsaPrivPem.codeUnits));
-
-  // TODO: Check for timeout here
-  final resp = await http.post(
-    Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/signup'),
-    headers: <String, String>{
-      'Content-Type': 'application/json; charset=UTF-8',
-    },
-    body: jsonEncode(<String, String>{
-      'username': username,
-      'password': password,
-      'confirm_password': confirmPassword,
-      'asymmetric_public_key': rsaPubPem,
-      'asymmetric_private_key': encRsaPriv,
-    }),
-  );
-
-  SignupResponse response = SignupResponse.fromJson(jsonDecode(resp.body));
-
-  if (resp.statusCode != 201) {
-    throw Exception(response.message);
-  }
-
-  return response;
-}
 
 class Signup extends StatelessWidget {
   const Signup({Key? key}) : super(key: key);
@@ -93,22 +63,26 @@ class SignupWidget extends StatefulWidget {
 class _SignupWidgetState extends State<SignupWidget> {
   final _formKey = GlobalKey<FormState>();
 
-  TextEditingController _usernameController = TextEditingController();
-  TextEditingController _passwordController = TextEditingController();
-  TextEditingController _passwordConfirmController = TextEditingController();
+  final TextEditingController _usernameController = TextEditingController();
+  final TextEditingController _passwordController = TextEditingController();
+  final TextEditingController _passwordConfirmController = TextEditingController();
+  final TextEditingController _serverUrlController = TextEditingController();
+
+  bool showUrlInput = false;
+
+  final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
+      borderRadius: BorderRadius.circular(5),
+      borderSide: const BorderSide(
+          color: Colors.transparent,
+      )
+  );
+
+  final TextStyle inputTextStyle = const TextStyle(
+      fontSize: 18,
+  );
 
   @override
   Widget build(BuildContext context) {
-    const TextStyle inputTextStyle = TextStyle(
-        fontSize: 18,
-    );
-
-    final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
-        borderRadius: BorderRadius.circular(5),
-        borderSide: const BorderSide(
-            color: Colors.transparent,
-        )
-    );
 
     final ButtonStyle buttonStyle = ElevatedButton.styleFrom(
         primary: Theme.of(context).colorScheme.surface,
@@ -123,117 +97,209 @@ class _SignupWidgetState extends State<SignupWidget> {
     );
 
     return Center(
-      child: Form(
-        key: _formKey,
-        child: Center(
-          child: Padding(
-            padding: const EdgeInsets.only(
-                left: 20,
-                right: 20,
-                top: 0,
-                bottom: 100,
-            ),
-            child: Column(
-              mainAxisAlignment: MainAxisAlignment.center,
-              crossAxisAlignment: CrossAxisAlignment.center,
-              children: [
-                Text(
-                  'Sign Up',
-                  style: TextStyle(
-                    fontSize: 35,
-                    color: Theme.of(context).colorScheme.onBackground,
+      child: SingleChildScrollView(
+        child: Form(
+          key: _formKey,
+          child: Center(
+            child: Padding(
+              padding: const EdgeInsets.only(
+                  left: 20,
+                  right: 20,
+                  top: 0,
+                  bottom: 100,
+              ),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                crossAxisAlignment: CrossAxisAlignment.center,
+                children: [
+                  Text(
+                    'Sign Up',
+                    style: TextStyle(
+                      fontSize: 35,
+                      color: Theme.of(context).colorScheme.onBackground,
+                    ),
                   ),
-                ),
-                const SizedBox(height: 30),
-                TextFormField(
-                  controller: _usernameController,
-                  decoration: InputDecoration(
-                    hintText: 'Username',
-                    enabledBorder: inputBorderStyle,
-                    focusedBorder: inputBorderStyle,
+                  const SizedBox(height: 30),
+                  input(
+                    _usernameController,
+                    'Username',
+                    false,
+                    (value) {
+                      if (value == null || value.isEmpty) {
+                        return 'Create a username';
+                      }
+                      return null;
+                    },
                   ),
-                  style: inputTextStyle,
-                  // The validator receives the text that the user has entered.
-                  validator: (value) {
-                    if (value == null || value.isEmpty) {
-                      return 'Create a username';
-                    }
-                    return null;
-                  },
-                ),
-                const SizedBox(height: 10),
-                TextFormField(
-                  controller: _passwordController,
-                  obscureText: true,
-                  enableSuggestions: false,
-                  autocorrect: false,
-                  decoration: InputDecoration(
-                    hintText: 'Password',
-                    enabledBorder: inputBorderStyle,
-                    focusedBorder: inputBorderStyle,
+                  const SizedBox(height: 10),
+                  input(
+                    _passwordController,
+                    'Password',
+                    true,
+                    (value) {
+                      if (value == null || value.isEmpty) {
+                        return 'Enter a password';
+                      }
+                      return null;
+                    },
                   ),
-                  style: inputTextStyle,
-                  // The validator receives the text that the user has entered.
-                  validator: (value) {
-                    if (value == null || value.isEmpty) {
-                      return 'Enter a password';
-                    }
-                    return null;
-                  },
-                ),
-                const SizedBox(height: 10),
-                TextFormField(
-                  controller: _passwordConfirmController,
-                  obscureText: true,
-                  enableSuggestions: false,
-                  autocorrect: false,
-                  decoration: InputDecoration(
-                    hintText: 'Confirm Password',
-                    enabledBorder: inputBorderStyle,
-                    focusedBorder: inputBorderStyle,
+                  const SizedBox(height: 10),
+                  input(
+                    _passwordConfirmController,
+                    'Confirm Password',
+                    true,
+                    (value) {
+                      if (value == null || value.isEmpty) {
+                        return 'Confirm your password';
+                      }
+                      if (value != _passwordController.text) {
+                        return 'Passwords do not match';
+                      }
+                      return null;
+                    },
                   ),
-                  style: inputTextStyle,
-                  // The validator receives the text that the user has entered.
-                  validator: (value) {
-                    if (value == null || value.isEmpty) {
-                      return 'Confirm your password';
-                    }
-                    if (value != _passwordController.text) {
-                      return 'Passwords do not match';
-                    }
-                    return null;
-                  },
-                ),
-                const SizedBox(height: 15),
-                ElevatedButton(
-                  style: buttonStyle,
-                  onPressed: () {
-                    if (!_formKey.currentState!.validate()) {
-                      return;
-                    }
-
-                    ScaffoldMessenger.of(context).showSnackBar(
-                      const SnackBar(content: Text('Processing Data')),
-                    );
-
-                    signUp(
-                      context,
-                      _usernameController.text,
-                      _passwordController.text,
-                      _passwordConfirmController.text
-                    ).then((value) {
-                      Navigator.of(context).popUntil((route) => route.isFirst);
-                    }).catchError((error) {
-                      print(error); // TODO: Show error on interface
-                    });
-                  },
-                  child: const Text('Submit'),
-                ),
-              ],
+                  const SizedBox(height: 15),
+                  serverUrl(),
+                  const SizedBox(height: 15),
+                  ElevatedButton(
+                    style: buttonStyle,
+                    onPressed: () {
+                      if (!_formKey.currentState!.validate()) {
+                        return;
+                      }
+
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        const SnackBar(content: Text('Processing Data')),
+                      );
+
+                      signUp()
+                        .then((dynamic) {
+                          Navigator.of(context).popUntil((route) => route.isFirst);
+                        }).catchError((error) {
+                          showMessage('Failed to signup to Envelope, please try again later', context);
+                        });
+                    },
+                    child: const Text('Submit'),
+                  ),
+                ],
+              )
             )
           )
         )
       )
     );
   }
+
+  Widget input(
+    TextEditingController textController,
+    String hintText,
+    bool password,
+    String? Function(dynamic) validationFunction,
+  ) {
+    return TextFormField(
+      controller: textController,
+      obscureText: password,
+      enableSuggestions: false,
+      autocorrect: false,
+      decoration: InputDecoration(
+        hintText: hintText,
+        enabledBorder: inputBorderStyle,
+        focusedBorder: inputBorderStyle,
+      ),
+      style: inputTextStyle,
+      validator: validationFunction,
+    );
+  }
+
+  Widget serverUrl() {
+    if (!showUrlInput) {
+      return 
+          Padding(
+          padding: const EdgeInsets.only(top: 0, bottom: 10),
+          child: Row(
+            children: [
+              SizedBox(
+                height: 10,
+                child: IconButton(
+                  onPressed: () { 
+                    setState(() {
+                      showUrlInput = true; 
+                    });
+                  },
+                  icon: Icon(
+                    Icons.edit,
+                    color: Theme.of(context).disabledColor,
+                  ),
+                  splashRadius: 2,
+                  padding: const EdgeInsets.all(2),
+                  iconSize: 15,
+                ),
+              ),
+              const SizedBox(width: 2),
+              Column(
+                children: [
+                  const SizedBox(height: 10),
+                  Text(
+                    'Server URL - $defaultServerUrl',
+                    style: TextStyle(
+                      color: Theme.of(context).disabledColor,
+                      fontSize: 12,
+                    ),
+                  ),
+                ],
+              ),
+            ],
+        ),
+      );
+    }
+
+    if (_serverUrlController.text == '') {
+      _serverUrlController.text = defaultServerUrl;
+    }
+
+    return input(
+      _serverUrlController,
+      'Server URL',
+      false,
+      (dynamic) {
+        return null;
+      },
+    );
+  }
+
+  Future<SignupResponse> signUp() async {
+    await MyProfile.setServerUrl(_serverUrlController.text);
+
+    var keyPair = CryptoUtils.generateRSAKeyPair();
+
+    var rsaPubPem = CryptoUtils.encodeRSAPublicKeyToPem(keyPair.publicKey);
+    var rsaPrivPem = CryptoUtils.encodeRSAPrivateKeyToPem(keyPair.privateKey);
+
+    String encRsaPriv = AesHelper.aesEncrypt(
+      _passwordController.text, 
+      Uint8List.fromList(rsaPrivPem.codeUnits),
+    );
+
+    final resp = await http.post(
+      await MyProfile.getServerUrl('api/v1/signup'),
+      headers: <String, String>{
+        'Content-Type': 'application/json; charset=UTF-8',
+      },
+      body: jsonEncode(<String, String>{
+        'username': _usernameController.text,
+        'password': _passwordController.text,
+        'confirm_password': _passwordConfirmController.text,
+        'asymmetric_public_key': rsaPubPem,
+        'asymmetric_private_key': encRsaPriv,
+      }),
+    );
+
+    SignupResponse response = SignupResponse.fromJson(jsonDecode(resp.body));
+
+    if (resp.statusCode != 201) {
+      throw Exception(response.message);
+    }
+
+    return response;
+  }
 }

mobile/lib/views/main/friend/add_search.dart

@@ -2,12 +2,11 @@ import 'dart:convert';
 
 import 'package:flutter/material.dart';
 import 'package:http/http.dart' as http;
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 
 import '/utils/storage/session_cookie.dart';
 import '/components/user_search_result.dart';
 import '/data_models/user_search.dart';
-
+import '/models/my_profile.dart';
 
 class FriendAddSearch extends StatefulWidget {
   const FriendAddSearch({
@@ -123,7 +122,7 @@ class _FriendAddSearchState extends State<FriendAddSearch> {
 
     Map<String, String> params = {};
     params['username'] = searchController.text;
-    var uri = Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/users');
+    var uri = await MyProfile.getServerUrl('api/v1/auth/users');
     uri = uri.replace(queryParameters: params);
 
     var resp = await http.get(

mobile/lib/views/main/friend/request_list_item.dart

@@ -1,16 +1,15 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:Envelope/components/flash_message.dart';
-import 'package:Envelope/utils/storage/database.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 
+import '/components/flash_message.dart';
 import '/components/custom_circle_avatar.dart';
 import '/models/friends.dart';
-import '/utils/storage/session_cookie.dart';
 import '/models/my_profile.dart';
+import '/utils/storage/session_cookie.dart';
+import '/utils/storage/database.dart';
 import '/utils/encryption/aes_helper.dart';
 import '/utils/encryption/crypto_utils.dart';
 import '/utils/strings.dart';
@@ -122,7 +121,7 @@ class _FriendRequestListItemState extends State<FriendRequestListItem> {
     });
 
     var resp = await http.post(
-        Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/friend_request/${widget.friend.id}'),
+        await MyProfile.getServerUrl('api/v1/auth/friend_request/${widget.friend.id}'),
         headers: {
           'cookie': await getSessionCookie(),
         },
@@ -153,7 +152,7 @@ class _FriendRequestListItemState extends State<FriendRequestListItem> {
 
   Future<void> rejectFriendRequest() async {
     var resp = await http.delete(
-        Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/friend_request/${widget.friend.id}'),
+        await MyProfile.getServerUrl('api/v1/auth/friend_request/${widget.friend.id}'),
         headers: {
           'cookie': await getSessionCookie(),
         },

mobile/lib/views/main/home.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 
 import '/models/conversations.dart';
@@ -94,7 +93,7 @@ class _HomeState extends State<Home> {
     int statusCode = 200;
     try {
       var resp = await http.get(
-          Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/check'),
+          await MyProfile.getServerUrl('api/v1/auth/check'),
           headers: {
             'cookie': await getSessionCookie(),
           }

mobile/lib/views/main/profile/change_password.dart

@@ -1,13 +1,13 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 import 'package:flutter/material.dart';
 import 'package:pointycastle/impl.dart';
 
 import '/components/flash_message.dart';
 import '/components/custom_title_bar.dart';
+import '/models/my_profile.dart';
 import '/utils/encryption/aes_helper.dart';
 import '/utils/encryption/crypto_utils.dart';
 import '/utils/storage/session_cookie.dart';
@@ -155,7 +155,7 @@ class ChangePassword extends StatelessWidget {
     });
 
     var resp = await http.post(
-      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/change_password'),
+      await MyProfile.getServerUrl('api/v1/auth/change_password'),
       headers: <String, String>{
         'Content-Type': 'application/json; charset=UTF-8',
         'cookie': await getSessionCookie(),

mobile/lib/views/main/profile/change_server_url.dart

@@ -0,0 +1,142 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '/components/custom_title_bar.dart';
+import '/models/my_profile.dart';
+import '/utils/storage/database.dart';
+
+@immutable
+class ChangeServerUrl extends StatefulWidget {
+  const ChangeServerUrl({
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  State<ChangeServerUrl> createState() => _ChangeServerUrl();
+}
+
+class _ChangeServerUrl extends State<ChangeServerUrl> {
+  final _formKey = GlobalKey<FormState>();
+
+  final TextEditingController _serverUrlController = TextEditingController();
+
+  bool invalidCurrentPassword = false;
+
+  @override
+  void initState() {
+    setUrl();
+    super.initState();
+  }
+
+  Future<void> setUrl() async {
+    final preferences = await SharedPreferences.getInstance();
+    _serverUrlController.text = preferences.getString('server_url') ?? defaultServerUrl;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: const CustomTitleBar(
+        title: Text(
+          'Profile',
+          style: TextStyle(
+            fontSize: 32,
+            fontWeight: FontWeight.bold
+          )
+        ),
+        showBack: true,
+        backgroundColor: Colors.transparent,
+      ),
+      body: SingleChildScrollView(
+        child: Center(
+          child: Form(
+            key: _formKey,
+            child: Padding(
+              padding: const EdgeInsets.only(
+                left: 20,
+                right: 20,
+                top: 30,
+              ),
+              child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  children: [
+                    const Text(
+                      'Change Server Url',
+                      style: TextStyle(
+                        fontSize: 25,
+                      ),
+                    ),
+                    const SizedBox(height: 30),
+                    showWarning(),
+                    const SizedBox(height: 30),
+                    TextFormField(
+                      controller: _serverUrlController,
+                      decoration: const InputDecoration(
+                          hintText: 'Server Url',
+                      ),
+                      // The validator receives the text that the user has entered.
+                      validator: (String? value) {
+                        if (value == null || !Uri.parse(value).isAbsolute) {
+                          return 'Invalid URL';
+                        }
+                        return null;
+                      },
+                    ),
+                    const SizedBox(height: 15),
+                    ElevatedButton(
+                      onPressed: () {
+                        if (!_formKey.currentState!.validate()) {
+                          return;
+                        }
+
+                        ScaffoldMessenger.of(context).showSnackBar(
+                          const SnackBar(content: Text('Processing Data')),
+                        );
+
+                      },
+                      child: const Text('CHANGE SERVER URL'),
+                  ),
+                ],
+              )
+            )
+          )
+        )
+      )
+    );
+  }
+
+  Widget showWarning() {
+    String warning1 = '''
+WARNING: Do not use this feature unless you know what you\'re doing!
+''';
+
+    String warning2 = '''
+Changing the server url will disconnect you from all friends and conversations on this server, and connect you to a fresh environment. This feature is intended to be used by people that are willing to host their own Envelope server, which you can find by going to \nhttps://github.com/SomeUsername/SomeRepo.\n\n
+You can revert this by entering \nhttps://envelope-messenger.com\n on the login screen.
+''';
+
+    return Column(
+      children: [
+        Text(
+          warning1,
+          textAlign: TextAlign.center,
+          style: TextStyle(
+            color: Theme.of(context).colorScheme.error,
+          )
+        ),
+        Text(
+          warning2,
+          textAlign: TextAlign.center,
+        ),
+      ],
+    );
+  }
+
+  // TODO: Write user data to new server??
+  Future<void> changeUrl() async {
+    MyProfile.setServerUrl(_serverUrlController.text);
+    deleteDb();
+    MyProfile.logout();
+    Navigator.pushNamedAndRemoveUntil(context, '/landing', ModalRoute.withName('/landing'));
+  }
+}

mobile/lib/views/main/profile/profile.dart

@@ -1,7 +1,5 @@
 import 'dart:convert';
 
-import 'package:Envelope/utils/encryption/crypto_utils.dart';
-import 'package:Envelope/views/main/profile/change_password.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:qr_flutter/qr_flutter.dart';
@@ -10,7 +8,10 @@ import 'package:sliding_up_panel/sliding_up_panel.dart';
 import '/components/custom_circle_avatar.dart';
 import '/components/custom_title_bar.dart';
 import '/models/my_profile.dart';
+import '/utils/encryption/crypto_utils.dart';
 import '/utils/storage/database.dart';
+import '/views/main/profile/change_password.dart';
+import '/views/main/profile/change_server_url.dart';
 
 class Profile extends StatefulWidget {
   final MyProfile profile;
@@ -178,7 +179,10 @@ class _ProfileState extends State<Profile> {
               )
             ),
             onPressed: () {
-              print('Server URL');
+              Navigator.of(context).push(
+                MaterialPageRoute(builder: (context) => ChangeServerUrl(
+                ))
+              );
             }
           ),
           const SizedBox(height: 5),