Backend/Api/Auth/ChangeMessageExpiry.go

@@ -0,0 +1,52 @@
+package Auth
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+
+	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Database"
+	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Models"
+)
+
+type rawChangeMessageExpiry struct {
+	MessageExpiry string `json:"message_exipry"`
+}
+
+// ChangeMessageExpiry handles changing default message expiry for user
+func ChangeMessageExpiry(w http.ResponseWriter, r *http.Request) {
+	var (
+		user                Models.User
+		changeMessageExpiry rawChangeMessageExpiry
+		requestBody         []byte
+		err                 error
+	)
+
+	// Ignore error here, as middleware should handle auth
+	user, _ = CheckCookieCurrentUser(w, r)
+
+	requestBody, err = ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	err = json.Unmarshal(requestBody, &changeMessageExpiry)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	user.AsymmetricPrivateKey = changeMessageExpiry.MessageExpiry
+
+	err = Database.UpdateUser(
+		user.ID.String(),
+		&user,
+	)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}

Backend/Api/Auth/ChangePassword.go

@@ -0,0 +1,76 @@
+package Auth
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+
+	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Database"
+	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Models"
+)
+
+type rawChangePassword struct {
+	OldPassword        string `json:"old_password"`
+	NewPassword        string `json:"new_password"`
+	NewPasswordConfirm string `json:"new_password_confirm"`
+	PrivateKey         string `json:"private_key"`
+}
+
+// ChangePassword handle change password action
+func ChangePassword(w http.ResponseWriter, r *http.Request) {
+	var (
+		user           Models.User
+		changePassword rawChangePassword
+		requestBody    []byte
+		err            error
+	)
+
+	user, err = CheckCookieCurrentUser(w, r)
+	if err != nil {
+		// Don't bother showing an error here, as the middleware handles auth
+		return
+	}
+
+	requestBody, err = ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	err = json.Unmarshal(requestBody, &changePassword)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	if !CheckPasswordHash(changePassword.OldPassword, user.Password) {
+		http.Error(w, "Invalid Current Password", http.StatusForbidden)
+		return
+	}
+
+	// This should never occur, due to frontend validation
+	if changePassword.NewPassword != changePassword.NewPasswordConfirm {
+		http.Error(w, "Invalid New Password", http.StatusUnprocessableEntity)
+		return
+	}
+
+	user.Password, err = HashPassword(changePassword.NewPassword)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	// Private key doesn't change at this point, is just re-encrypted with the new password
+	user.AsymmetricPrivateKey = changePassword.PrivateKey
+
+	err = Database.UpdateUser(
+		user.ID.String(),
+		&user,
+	)
+	if err != nil {
+		http.Error(w, "Error", http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}

Backend/Api/Auth/Check.go

@@ -4,6 +4,7 @@ import (
 	"net/http"
 )
 
+// Check is used to check session viability
 func Check(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)
 }

Backend/Api/Auth/Login.go

@@ -1,6 +1,7 @@
 package Auth
 
 import (
+	"database/sql/driver"
 	"encoding/json"
 	"net/http"
 	"time"
@@ -9,7 +10,7 @@ import (
 	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Models"
 )
 
-type Credentials struct {
+type credentials struct {
 	Username string `json:"username"`
 	Password string `json:"password"`
 }
@@ -21,25 +22,32 @@ type loginResponse struct {
 	AsymmetricPrivateKey string `json:"asymmetric_private_key"`
 	UserID               string `json:"user_id"`
 	Username             string `json:"username"`
+	MessageExpiryDefault string `json:"message_expiry_default"`
 }
 
 func makeLoginResponse(w http.ResponseWriter, code int, message, pubKey, privKey string, user Models.User) {
 	var (
-		status     string = "error"
-		returnJson []byte
+		status           = "error"
+		messageExpiryRaw driver.Value
+		messageExpiry    string
+		returnJSON       []byte
 		err              error
 	)
-	if code > 200 && code < 300 {
+	if code >= 200 && code <= 300 {
 		status = "success"
 	}
 
-	returnJson, err = json.MarshalIndent(loginResponse{
+	messageExpiryRaw, _ = user.MessageExpiryDefault.Value()
+	messageExpiry, _ = messageExpiryRaw.(string)
+
+	returnJSON, err = json.MarshalIndent(loginResponse{
 		Status:               status,
 		Message:              message,
 		AsymmetricPublicKey:  pubKey,
 		AsymmetricPrivateKey: privKey,
 		UserID:               user.ID.String(),
 		Username:             user.Username,
+		MessageExpiryDefault: messageExpiry,
 	}, "", "  ")
 	if err != nil {
 		http.Error(w, "Error", http.StatusInternalServerError)
@@ -48,12 +56,13 @@ func makeLoginResponse(w http.ResponseWriter, code int, message, pubKey, privKey
 
 	// Return updated json
 	w.WriteHeader(code)
-	w.Write(returnJson)
+	w.Write(returnJSON)
 }
 
+// Login logs the user into the system
 func Login(w http.ResponseWriter, r *http.Request) {
 	var (
-		creds     Credentials
+		creds     credentials
 		userData  Models.User
 		session   Models.Session
 		expiresAt time.Time

Backend/Api/Auth/Signup.go

@@ -18,15 +18,15 @@ type signupResponse struct {
 
 func makeSignupResponse(w http.ResponseWriter, code int, message string) {
 	var (
-		status     string = "error"
-		returnJson []byte
+		status     = "error"
+		returnJSON []byte
 		err        error
 	)
 	if code > 200 && code < 300 {
 		status = "success"
 	}
 
-	returnJson, err = json.MarshalIndent(signupResponse{
+	returnJSON, err = json.MarshalIndent(signupResponse{
 		Status:  status,
 		Message: message,
 	}, "", "  ")
@@ -37,10 +37,11 @@ func makeSignupResponse(w http.ResponseWriter, code int, message string) {
 
 	// Return updated json
 	w.WriteHeader(code)
-	w.Write(returnJson)
+	w.Write(returnJSON)
 
 }
 
+// Signup to the platform
 func Signup(w http.ResponseWriter, r *http.Request) {
 	var (
 		userData    Models.User

Backend/Api/Routes.go

@@ -61,6 +61,9 @@ func InitAPIEndpoints(router *mux.Router) {
 
 	authAPI.HandleFunc("/check", Auth.Check).Methods("GET")
 
+	authAPI.HandleFunc("/change_password", Auth.ChangePassword).Methods("POST")
+	authAPI.HandleFunc("/message_expiry", Auth.ChangeMessageExpiry).Methods("POST")
+
 	authAPI.HandleFunc("/users", Users.SearchUsers).Methods("GET")
 
 	authAPI.HandleFunc("/friend_requests", Friends.EncryptedFriendRequestList).Methods("GET")

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/Database/Seeder/Seed.go

@@ -58,6 +58,7 @@ var (
 	decodedPrivateKey *rsa.PrivateKey
 )
 
+// Seed seeds semi random data for use in testing & development
 func Seed() {
 	var (
 		block  *pem.Block

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") {
@@ -13,6 +15,42 @@ 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"`
@@ -20,4 +58,6 @@ type User struct {
 	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:"-" sql:"type:ENUM('fifteen_min', 'thirty_min', 'one_hour', 'three_hour', 'six_hour', 'twelve_hour', 'one_day', 'three_day')"` // Stored encrypted
+
 }

mobile/lib/components/custom_title_bar.dart

@@ -8,12 +8,14 @@ class CustomTitleBar extends StatelessWidget with PreferredSizeWidget {
     required this.showBack,
     this.rightHandButton,
     this.backgroundColor,
+    this.beforeBack,
   }) : super(key: key);
 
   final Text title;
   final bool showBack;
   final IconButton? rightHandButton;
   final Color? backgroundColor;
+  final Future<void> Function()? beforeBack;
 
   @override
   Size get preferredSize => const Size.fromHeight(kToolbarHeight);
@@ -59,7 +61,11 @@ class CustomTitleBar extends StatelessWidget with PreferredSizeWidget {
 
   Widget _backButton(BuildContext context) {
     return IconButton(
-      onPressed: (){
+      onPressed: () {
+        if (beforeBack != null) {
+          beforeBack!().then((dynamic) => Navigator.pop(context));
+          return;
+        }
         Navigator.pop(context);
       },
       icon: Icon(

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/select_message_ttl.dart

@@ -0,0 +1,108 @@
+import 'package:flutter/material.dart';
+
+import '/components/custom_title_bar.dart';
+
+const Map<String, String> messageExpiryValues = {
+  'no_expiry': 'No Expiry',
+  'fifteen_min': '15 Minutes',
+  'thirty_min': '30 Minutes',
+  'one_hour': '1 Hour',
+  'three_hour': '3 Hours',
+  'six_hour': '6 Hours',
+  'twelve_day': '12 Hours',
+  'one_day': '1 Day',
+  'three_day': '3 Days',
+};
+
+class SelectMessageTTL extends StatefulWidget {
+  const SelectMessageTTL({
+    Key? key,
+    required this.widgetTitle,
+    required this.backCallback,
+    this.currentSelected,
+  }) : super(key: key);
+
+  final String widgetTitle;
+  final Future<void> Function(String messageExpiry) backCallback;
+  final String? currentSelected;
+
+  @override
+  _SelectMessageTTLState createState() => _SelectMessageTTLState();
+}
+
+class _SelectMessageTTLState extends State<SelectMessageTTL> {
+  String selectedExpiry = 'no_expiry';
+
+  @override
+  void initState() {
+    selectedExpiry = widget.currentSelected ?? 'no_expiry';
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: CustomTitleBar(
+        title: Text(
+          widget.widgetTitle,
+          style: const TextStyle(
+            fontSize: 28,
+            fontWeight: FontWeight.bold
+          )
+        ),
+        showBack: true,
+        backgroundColor: Colors.transparent,
+        beforeBack: () async {
+          widget.backCallback(selectedExpiry);
+        },
+      ),
+      body: Padding(
+        padding: const EdgeInsets.only(top: 30),
+        child: list(),
+      ),
+    );
+  }
+
+  Widget list() {
+    return ListView.builder(
+      itemCount: messageExpiryValues.length,
+      shrinkWrap: true,
+      itemBuilder: (context, i) {
+        String key = messageExpiryValues.keys.elementAt(i);
+
+        return GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          onTap: () {
+            setState(() {
+              selectedExpiry = key;
+            });
+          },
+
+          child: Padding(
+            padding: const EdgeInsets.only(left: 30, right: 20, top: 8, bottom: 8),
+            child: Row(
+              children: [
+                selectedExpiry == key ?
+                  const Icon(Icons.check) :
+                  const SizedBox(width: 20),
+                const SizedBox(width: 16),
+                Expanded(
+                 child: Align(
+                   alignment: Alignment.centerLeft,
+                   child: Text(
+                     messageExpiryValues[key] ?? '',
+                     style: const TextStyle(
+                       fontSize: 20,
+                       fontWeight: FontWeight.normal,
+                     ),
+                   ),
+                 )
+                )
+              ],
+            )
+          )
+        );
+      },
+    );
+  }
+}

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

@@ -49,6 +49,8 @@ class MyApp extends StatelessWidget {
           brightness: Brightness.dark,
           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:Envelope/components/select_message_ttl.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;
@@ -11,6 +18,7 @@ class MyProfile {
   RSAPrivateKey? privateKey;
   RSAPublicKey? publicKey;
   DateTime? loggedInAt;
+  String messageExpiryDefault = 'no_expiry';
 
   MyProfile({
     required this.id,
@@ -19,6 +27,7 @@ class MyProfile {
     this.privateKey,
     this.publicKey,
     this.loggedInAt,
+    required this.messageExpiryDefault,
   });
 
   factory MyProfile._fromJson(Map<String, dynamic> json) {
@@ -36,6 +45,7 @@ class MyProfile {
         privateKey: privateKey,
         publicKey: publicKey,
         loggedInAt: loggedInAt,
+        messageExpiryDefault: json['message_expiry_default']
     );
   }
 
@@ -61,6 +71,7 @@ class MyProfile {
           CryptoUtils.encodeRSAPublicKeyToPem(publicKey!) :
           null,
       'logged_in_at': loggedInAt?.toIso8601String(),
+      'message_expiry_default': messageExpiryDefault,
     });
   }
 
@@ -107,5 +118,22 @@ 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';
 
@@ -34,31 +36,6 @@ 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);
 
@@ -93,8 +70,8 @@ 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) {
@@ -145,7 +122,7 @@ class _LoginWidgetState extends State<LoginWidget> {
                 ),
                 const SizedBox(height: 30),
                 TextFormField(
-                              controller: usernameController,
+                  controller: _usernameController,
                   decoration: InputDecoration(
                     hintText: 'Username',
                     enabledBorder: inputBorderStyle,
@@ -162,7 +139,7 @@ class _LoginWidgetState extends State<LoginWidget> {
                 ),
                 const SizedBox(height: 10),
                 TextFormField(
-                              controller: passwordController,
+                  controller: _passwordController,
                   obscureText: true,
                   enableSuggestions: false,
                   autocorrect: false,
@@ -189,11 +166,8 @@ class _LoginWidgetState extends State<LoginWidget> {
                         const SnackBar(content: Text('Processing Data')),
                       );
 
-                                  login(
-                                      context,
-                                      usernameController.text,
-                                      passwordController.text,
-                                  ).then((val) {
+                      login()
+                        .then((val) {
                           Navigator.
                             pushNamedAndRemoveUntil(
                               context,
@@ -201,7 +175,10 @@ class _LoginWidgetState extends State<LoginWidget> {
                               ModalRoute.withName('/home'),
                             );
                         }).catchError((error) {
-                                    print(error); // TODO: Show error on interface
+                          showMessage(
+                            'Could not login to Envelope, please try again later.',
+                            context,
+                          );
                         });
                     }
                   },
@@ -214,4 +191,32 @@ class _LoginWidgetState extends State<LoginWidget> {
       )
     );
   }
+
+  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);
@@ -93,15 +63,12 @@ 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();
 
-  @override
-  Widget build(BuildContext context) {
-    const TextStyle inputTextStyle = TextStyle(
-        fontSize: 18,
-    );
+  bool showUrlInput = false;
 
   final OutlineInputBorder inputBorderStyle = OutlineInputBorder(
       borderRadius: BorderRadius.circular(5),
@@ -110,6 +77,13 @@ class _SignupWidgetState extends State<SignupWidget> {
       )
   );
 
+  final TextStyle inputTextStyle = const TextStyle(
+      fontSize: 18,
+  );
+
+  @override
+  Widget build(BuildContext context) {
+
     final ButtonStyle buttonStyle = ElevatedButton.styleFrom(
         primary: Theme.of(context).colorScheme.surface,
         onPrimary: Theme.of(context).colorScheme.onSurface,
@@ -123,6 +97,7 @@ class _SignupWidgetState extends State<SignupWidget> {
     );
 
     return Center(
+      child: SingleChildScrollView(
         child: Form(
           key: _formKey,
           child: Center(
@@ -145,16 +120,11 @@ class _SignupWidgetState extends State<SignupWidget> {
                     ),
                   ),
                   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) {
+                  input(
+                    _usernameController,
+                    'Username',
+                    false,
+                    (value) {
                       if (value == null || value.isEmpty) {
                         return 'Create a username';
                       }
@@ -162,19 +132,11 @@ class _SignupWidgetState extends State<SignupWidget> {
                     },
                   ),
                   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) {
+                  input(
+                    _passwordController,
+                    'Password',
+                    true,
+                    (value) {
                       if (value == null || value.isEmpty) {
                         return 'Enter a password';
                       }
@@ -182,48 +144,40 @@ class _SignupWidgetState extends State<SignupWidget> {
                     },
                   ),
                   const SizedBox(height: 10),
-                          TextFormField(
-                              controller: passwordConfirmController,
-                              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) {
+                  input(
+                    _passwordConfirmController,
+                    'Confirm Password',
+                    true,
+                    (value) {
                       if (value == null || value.isEmpty) {
                         return 'Confirm your password';
                       }
-                                if (value != passwordController.text) {
+                      if (value != _passwordController.text) {
                         return 'Passwords do not match';
                       }
                       return null;
                     },
                   ),
                   const SizedBox(height: 15),
+                  serverUrl(),
+                  const SizedBox(height: 15),
                   ElevatedButton(
                     style: buttonStyle,
                     onPressed: () {
-                                if (_formKey.currentState!.validate()) {
+                      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) {
+                      signUp()
+                        .then((dynamic) {
                           Navigator.of(context).popUntil((route) => route.isFirst);
                         }).catchError((error) {
-                                    print(error); // TODO: Show error on interface
+                          showMessage('Failed to signup to Envelope, please try again later', context);
                         });
-                                }
                     },
                     child: const Text('Submit'),
                   ),
@@ -232,6 +186,120 @@ class _SignupWidgetState extends State<SignupWidget> {
             )
           )
         )
+      )
+    );
+  }
+
+  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/conversation/detail.dart

@@ -22,7 +22,11 @@ class ConversationDetail extends StatefulWidget{
 
 class _ConversationDetailState extends State<ConversationDetail> {
   List<Message> messages = [];
-  MyProfile profile = MyProfile(id: '', username: '');
+  MyProfile profile = MyProfile(
+    id: '',
+    username: '',
+    messageExpiryDefault: 'no_expiry',
+  );
 
   TextEditingController msgController = TextEditingController();
 

mobile/lib/views/main/conversation/list.dart

@@ -47,7 +47,7 @@ class _ConversationListState extends State<ConversationList> {
             children: <Widget>[
              TextField(
                decoration: const InputDecoration(
-                 hintText: "Search...",
+                 hintText: 'Search...',
                  prefixIcon: Icon(
                    Icons.search,
                    size: 20

mobile/lib/views/main/conversation/list_item.dart

@@ -6,7 +6,7 @@ import '/models/conversations.dart';
 import '/views/main/conversation/detail.dart';
 import '/utils/time.dart';
 
-class ConversationListItem extends StatefulWidget{
+class ConversationListItem extends StatefulWidget {
   final Conversation conversation;
   const ConversationListItem({
     Key? key,
@@ -33,6 +33,7 @@ class _ConversationListItemState extends State<ConversationListItem> {
           );
         })).then(onGoBack) : null;
       },
+
       child: Container(
          padding: const EdgeInsets.only(left: 16,right: 0,top: 10,bottom: 10),
          child: !loaded ? null : Row(

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';
@@ -27,6 +26,7 @@ class _HomeState extends State<Home> {
   MyProfile profile = MyProfile(
     id: '',
     username: '',
+    messageExpiryDefault: 'no_expiry',
   );
 
   bool isLoading = true;
@@ -38,6 +38,7 @@ class _HomeState extends State<Home> {
       profile: MyProfile(
         id: '',
         username: '',
+        messageExpiryDefault: 'no_expiry',
       )
     ),
   ];
@@ -94,7 +95,7 @@ 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

@@ -0,0 +1,180 @@
+import 'dart:convert';
+import 'dart:typed_data';
+
+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';
+
+@immutable
+class ChangePassword extends StatelessWidget {
+  ChangePassword({
+    Key? key,
+    required this.privateKey
+  }) : super(key: key);
+
+  final RSAPrivateKey privateKey;
+
+  final _formKey = GlobalKey<FormState>();
+
+  final TextEditingController _currentPasswordController = TextEditingController();
+  final TextEditingController _newPasswordController = TextEditingController();
+  final TextEditingController _newPasswordConfirmController = TextEditingController();
+
+  bool invalidCurrentPassword = false;
+
+  @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: Form(
+        key: _formKey,
+        child: Padding(
+          padding: const EdgeInsets.only(
+            left: 20,
+            right: 20,
+            top: 30,
+          ),
+          child: Column(
+              crossAxisAlignment: CrossAxisAlignment.center,
+              children: [
+                const Text(
+                  'Change Password',
+                  style: TextStyle(
+                    fontSize: 25,
+                  ),
+                ),
+                const SizedBox(height: 30),
+                TextFormField(
+                  controller: _currentPasswordController,
+                  decoration: const InputDecoration(
+                      hintText: 'Current Password',
+                  ),
+                  // The validator receives the text that the user has entered.
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Enter your current password';
+                    }
+                    if (invalidCurrentPassword) {
+                      return 'Invalid password';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 10),
+                TextFormField(
+                  controller: _newPasswordController,
+                  obscureText: true,
+                  enableSuggestions: false,
+                  autocorrect: false,
+                  decoration: const InputDecoration(
+                      hintText: 'New Password',
+                  ),
+                  // The validator receives the text that the user has entered.
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Enter a new password';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 10),
+                TextFormField(
+                  controller: _newPasswordConfirmController,
+                  obscureText: true,
+                  enableSuggestions: false,
+                  autocorrect: false,
+                  decoration: const InputDecoration(
+                      hintText: 'Confirm Password',
+                  ),
+                  // The validator receives the text that the user has entered.
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Confirm your password';
+                    }
+                    if (value != _newPasswordController.text) {
+                      return 'Passwords do not match';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 15),
+                ElevatedButton(
+                  onPressed: () {
+                    if (!_formKey.currentState!.validate()) {
+                      return;
+                    }
+
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(content: Text('Processing Data')),
+                    );
+
+                    _changePassword(context)
+                      .then((dynamic) {
+                        Navigator.of(context).pop();
+                      });
+                  },
+                  child: const Text('Submit'),
+              ),
+            ],
+          )
+        )
+      )
+    );
+  }
+
+  Future<void> _changePassword(BuildContext context) async {
+    String privateKeyPem = CryptoUtils.encodeRSAPrivateKeyToPem(privateKey);
+
+    String privateKeyEncrypted = AesHelper.aesEncrypt(
+      _newPasswordController.text,
+      Uint8List.fromList(privateKeyPem.codeUnits),
+    );
+
+    String payload = jsonEncode({
+      'old_password': _currentPasswordController.text,
+      'new_password': _newPasswordController.text,
+      'new_password_confirm': _newPasswordConfirmController.text,
+      'private_key': privateKeyEncrypted,
+    });
+
+    var resp = await http.post(
+      await MyProfile.getServerUrl('api/v1/auth/change_password'),
+      headers: <String, String>{
+        'Content-Type': 'application/json; charset=UTF-8',
+        'cookie': await getSessionCookie(),
+      },
+      body: payload,
+    );
+
+    if (resp.statusCode == 403) {
+      invalidCurrentPassword = true;
+      _formKey.currentState!.validate();
+      return;
+    }
+
+    if (resp.statusCode != 200) {
+      showMessage(
+        'An unexpected error occured, please try again later.',
+        context,
+      );
+    }
+  }
+}
+

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

@@ -1,10 +1,21 @@
-import 'package:Envelope/components/custom_title_bar.dart';
+import 'dart:convert';
+
+import 'package:Envelope/components/flash_message.dart';
+import 'package:Envelope/utils/storage/session_cookie.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:qr_flutter/qr_flutter.dart';
-import '/utils/storage/database.dart';
-import '/models/my_profile.dart';
+import 'package:sliding_up_panel/sliding_up_panel.dart';
+import 'package:http/http.dart' as http;
+
+import '/components/select_message_ttl.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;
@@ -18,6 +29,51 @@ class Profile extends StatefulWidget {
 }
 
 class _ProfileState extends State<Profile> {
+  final PanelController _panelController = PanelController();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: const CustomTitleBar(
+        title: Text(
+          'Profile',
+          style: TextStyle(
+            fontSize: 32,
+            fontWeight: FontWeight.bold
+          )
+        ),
+        showBack: false,
+        backgroundColor: Colors.transparent,
+      ),
+      body: SlidingUpPanel(
+        controller: _panelController,
+        slideDirection: SlideDirection.DOWN,
+        defaultPanelState: PanelState.CLOSED,
+        color: Theme.of(context).scaffoldBackgroundColor,
+        backdropTapClosesPanel: true,
+        backdropEnabled: true,
+        backdropOpacity: 0.2,
+        minHeight: 0,
+        maxHeight: 450,
+        panel: Center(
+              child: _profileQrCode(),
+        ),
+        body: Padding(
+          padding: const EdgeInsets.only(top: 16,left: 16,right: 16),
+          child: Column(
+            children: <Widget>[
+              usernameHeading(),
+              const SizedBox(height: 30),
+              settings(),
+              const SizedBox(height: 30),
+              logout(),
+            ],
+          )
+        ),
+      ),
+    );
+  }
+
   Widget usernameHeading() {
     return Row(
       children: <Widget> [
@@ -27,37 +83,62 @@ class _ProfileState extends State<Profile> {
           radius: 30,
         ),
         const SizedBox(width: 20),
-          Text(
+        Expanded(
+          flex: 1,
+          child: Text(
             widget.profile.username,
             style: const TextStyle(
               fontSize: 25,
               fontWeight: FontWeight.w500,
             ),
           ),
-          // widget.conversation.admin ? IconButton(
-          //     iconSize: 20,
-          //     icon: const Icon(Icons.edit),
-          //     padding: const EdgeInsets.all(5.0),
-          //     splashRadius: 25,
-          //     onPressed: () {
-          //       // TODO: Redirect to edit screen
-          //     },
-          // ) : const SizedBox.shrink(),
+        ),
+        IconButton(
+          onPressed: () => _panelController.open(),
+          icon: const Icon(Icons.qr_code_2),
+        ),
       ],
     );
   }
 
-  Widget _profileQrCode() {
-    return Container(
-        child: QrImage(
-            data: 'This is a simple QR code',
-            version: QrVersions.auto,
-            size: 130,
-            gapless: true,
+  Widget logout() {
+    bool isTesting = dotenv.env['ENVIRONMENT'] == 'development';
+
+    return Align(
+        alignment: Alignment.centerLeft,
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+             TextButton.icon(
+                label: const Text(
+                    'Logout',
+                    style: TextStyle(fontSize: 16)
+                ),
+                icon: const Icon(Icons.exit_to_app),
+                style: const ButtonStyle(
+                    alignment: Alignment.centerLeft,
+                ),
+                onPressed: () {
+                  deleteDb();
+                  MyProfile.logout();
+                  Navigator.pushNamedAndRemoveUntil(context, '/landing', ModalRoute.withName('/landing'));
+                }
+            ),
+            isTesting ? TextButton.icon(
+                label: const Text(
+                    'Delete Database',
+                    style: TextStyle(fontSize: 16)
+                ),
+                icon: const Icon(Icons.delete_forever),
+                style: const ButtonStyle(
+                    alignment: Alignment.centerLeft,
+                ),
+                onPressed: () {
+                  deleteDb();
+                }
+            ) : const SizedBox.shrink(),
+          ],
       ),
-        width: 130,
-        height: 130,
-        color: Theme.of(context).colorScheme.onPrimary,
     );
   }
 
@@ -67,7 +148,9 @@ class _ProfileState extends State<Profile> {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: [
+
           const SizedBox(height: 5),
+
           TextButton.icon(
             label: const Text(
               'Disappearing Messages',
@@ -83,82 +166,120 @@ class _ProfileState extends State<Profile> {
               )
             ),
             onPressed: () {
-                  print('Disappearing Messages');
+              Navigator.of(context).push(
+                MaterialPageRoute(builder: (context) => SelectMessageTTL(
+                    widgetTitle: 'Message Expiry',
+                    currentSelected: widget.profile.messageExpiryDefault,
+                    backCallback: (String messageExpiry) async {
+                      widget.profile.messageExpiryDefault = messageExpiry;
+
+                      http.post(
+                        await MyProfile.getServerUrl('api/v1/auth/message_expiry'),
+                        headers: {
+                          'cookie': await getSessionCookie(),
+                        },
+                        body: jsonEncode({
+                          'message_expiry': messageExpiry,
+                        }),
+                      ).then((http.Response response) {
+                        if (response.statusCode == 200) {
+                          return;
                         }
-            ),
-          ],
-      ),
+
+                        showMessage(
+                          'Could not change your default message expiry, please try again later.',
+                          context,
+                        );
+                      });
+                    },
+                ))
               );
             }
+          ),
+
+          const SizedBox(height: 5),
 
-  Widget logout() {
-    bool isTesting = dotenv.env["ENVIRONMENT"] == 'development';
-    return Align(
-        alignment: Alignment.centerLeft,
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
           TextButton.icon(
             label: const Text(
-                    'Logout',
+              'Server URL',
               style: TextStyle(fontSize: 16)
             ),
-                icon: const Icon(Icons.exit_to_app),
-                style: const ButtonStyle(
+            icon: const Icon(Icons.dataset_linked_outlined),
+            style: ButtonStyle(
               alignment: Alignment.centerLeft,
+              foregroundColor: MaterialStateProperty.resolveWith<Color>(
+                (Set<MaterialState> states) {
+                  return Theme.of(context).colorScheme.onBackground;
+                },
+              )
             ),
             onPressed: () {
-                  deleteDb();
-                  MyProfile.logout();
-                  Navigator.pushNamedAndRemoveUntil(context, '/landing', ModalRoute.withName('/landing'));
+              Navigator.of(context).push(
+                MaterialPageRoute(builder: (context) => const ChangeServerUrl())
+              );
             }
           ),
-            isTesting ? TextButton.icon(
+
+          const SizedBox(height: 5),
+
+          TextButton.icon(
             label: const Text(
-                    'Delete Database',
+              'Change Password',
               style: TextStyle(fontSize: 16)
             ),
-                icon: const Icon(Icons.delete_forever),
-                style: const ButtonStyle(
+            icon: const Icon(Icons.password),
+            style: ButtonStyle(
               alignment: Alignment.centerLeft,
+              foregroundColor: MaterialStateProperty.resolveWith<Color>(
+                (Set<MaterialState> states) {
+                  return Theme.of(context).colorScheme.onBackground;
+                },
+              )
             ),
             onPressed: () {
-                  deleteDb();
+              Navigator.of(context).push(
+                MaterialPageRoute(builder: (context) => ChangePassword(
+                    privateKey: widget.profile.privateKey!,
+                ))
+              );
             }
-            ) : const SizedBox.shrink(),
+          ),
         ],
       ),
     );
   }
 
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: const CustomTitleBar(
-        title: Text(
-          'Profile',
-          style: TextStyle(
-            fontSize: 32,
-            fontWeight: FontWeight.bold
-          )
+  Widget _profileQrCode() {
+    String payload = jsonEncode({
+      'i': widget.profile.id,
+      'u': widget.profile.username,
+      'k': base64.encode(
+        CryptoUtils.encodeRSAPublicKeyToPem(widget.profile.publicKey!).codeUnits
+      ),
+    });
+
+    return Column(
+      children: [ 
+        Padding(   
+          padding: const EdgeInsets.all(20),
+          child: QrImage(
+            backgroundColor: Theme.of(context).colorScheme.primary,
+            data: payload,
+            version: QrVersions.auto,
+            gapless: true,
+          ),
+        ),
+        Align(
+          alignment: Alignment.centerRight,
+          child: Padding(
+            padding: const EdgeInsets.only(right: 20),
+            child: IconButton(
+              onPressed: () => _panelController.close(),
+              icon: const Icon(Icons.arrow_upward),
             ),
-        showBack: false,
-        backgroundColor: Colors.transparent,
           ),
-      body: Padding(
-        padding: const EdgeInsets.only(top: 16,left: 16,right: 16),
-        child: Column(
-          children: <Widget>[
-            usernameHeading(),
-            const SizedBox(height: 30),
-            _profileQrCode(),
-            const SizedBox(height: 30),
-            settings(),
-            const SizedBox(height: 30),
-            logout(),
-          ],
-        )
         ),
+      ]
     );
   }
 }

mobile/pubspec.lock

@@ -322,6 +322,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.99"
+  sliding_up_panel:
+    dependency: "direct main"
+    description:
+      name: sliding_up_panel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0+1"
   source_span:
     dependency: transitive
     description:

mobile/pubspec.yaml

@@ -24,6 +24,7 @@ dependencies:
   uuid: ^3.0.6
   qr_flutter: ^4.0.0
   qr_code_scanner: ^1.0.1
+  sliding_up_panel: ^2.0.0+1
 
 dev_dependencies:
   flutter_test: