From 59f298a935c87077a6abd50656f8a4ead44bd979 Mon Sep 17 00:00:00 2001
From: Kingkor Roy Tirtho <krtirtho@gmail.com>
Date: Sat, 15 Mar 2025 01:41:16 +0600
Subject: [PATCH] fix: spotify login broken due to new totp requirement #2494

---
 .../authentication/authentication.dart        | 94 ++++++++++++++++++-
 pubspec.lock                                  | 18 +++-
 pubspec.yaml                                  |  2 +-
 3 files changed, 109 insertions(+), 5 deletions(-)

diff --git a/lib/provider/authentication/authentication.dart b/lib/provider/authentication/authentication.dart
index 40949e68..f6c6acfb 100644
--- a/lib/provider/authentication/authentication.dart
+++ b/lib/provider/authentication/authentication.dart
@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:collection/collection.dart';
@@ -15,6 +16,9 @@ import 'package:spotube/extensions/context.dart';
 import 'package:spotube/models/database/database.dart';
 import 'package:spotube/provider/database/database.dart';
 import 'package:spotube/utils/platform.dart';
+import 'package:otp_util/otp_util.dart';
+// ignore: implementation_imports
+import 'package:otp_util/src/utils/generic_util.dart';
 
 extension ExpirationAuthenticationTableData on AuthenticationTableData {
   bool get isExpired => DateTime.now().isAfter(expiration);
@@ -100,6 +104,83 @@ class AuthenticationNotifier extends AsyncNotifier<AuthenticationTableData?> {
         .insert(refreshedCredentials, mode: InsertMode.replace);
   }
 
+  String base32FromBytes(Uint8List e, String secretSauce) {
+    var t = 0;
+    var n = 0;
+    var r = "";
+    for (int i = 0; i < e.length; i++) {
+      n = n << 8 | e[i];
+      t += 8;
+      while (t >= 5) {
+        r += secretSauce[n >>> t - 5 & 31];
+        t -= 5;
+      }
+    }
+    if (t > 0) {
+      r += secretSauce[n << 5 - t & 31];
+    }
+    return r;
+  }
+
+  Uint8List cleanBuffer(String e) {
+    e = e.replaceAll(" ", "");
+    final t = List.filled(e.length ~/ 2, 0);
+    final n = Uint8List.fromList(t);
+    for (int r = 0; r < e.length; r += 2) {
+      n[r ~/ 2] = int.parse(e.substring(r, r + 2), radix: 16);
+    }
+    return n;
+  }
+
+  Future<String> generateTotp() async {
+    const secretSauce = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+    final secretCipherBytes = const [
+      12,
+      56,
+      76,
+      33,
+      88,
+      44,
+      88,
+      33,
+      78,
+      78,
+      11,
+      66,
+      22,
+      22,
+      55,
+      69,
+      54
+    ].mapIndexed((t, e) => e ^ t % 33 + 9).toList();
+
+    final secretBytes = cleanBuffer(
+      utf8
+          .encode(secretCipherBytes.join(""))
+          .map((e) => e.toRadixString(16))
+          .join(),
+    );
+
+    final secret = base32FromBytes(secretBytes, secretSauce);
+
+    final res = await dio.get("https://open.spotify.com/server-time");
+    final serverTimeSeconds = res.data["serverTime"] as int;
+
+    final totp = TOTP(
+      secret: secret,
+      algorithm: OTPAlgorithm.SHA1,
+      digits: 6,
+      interval: 30,
+    );
+
+    return totp.generateOTP(
+      input: Util.timeFormat(
+        time: DateTime.fromMillisecondsSinceEpoch(serverTimeSeconds * 1000),
+        interval: 30,
+      ),
+    );
+  }
+
   Future<AuthenticationTableCompanion> credentialsFromCookie(
     String cookie,
   ) async {
@@ -108,10 +189,17 @@ class AuthenticationNotifier extends AsyncNotifier<AuthenticationTableData?> {
           .split("; ")
           .firstWhereOrNull((c) => c.trim().startsWith("sp_dc="))
           ?.trim();
+
+      final totp = await generateTotp();
+      final timestamp = (DateTime.now().millisecondsSinceEpoch / 1000).floor();
+
+      final accessTokenUrl = Uri.parse(
+        "https://open.spotify.com/get_access_token?reason=transport&productType=web_player"
+        "&totp=$totp&totpVer=5&ts=$timestamp",
+      );
+
       final res = await dio.getUri(
-        Uri.parse(
-          "https://open.spotify.com/get_access_token?reason=transport&productType=web_player",
-        ),
+        accessTokenUrl,
         options: Options(
           headers: {
             "Cookie": spDc ?? "",
diff --git a/pubspec.lock b/pubspec.lock
index 6bdc876f..89e33185 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -166,6 +166,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.0"
+  base32:
+    dependency: transitive
+    description:
+      name: base32
+      sha256: ddad4ebfedf93d4500818ed8e61443b734ffe7cf8a45c668c9b34ef6adde02e2
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.3"
   bonsoir:
     dependency: "direct main"
     description:
@@ -440,7 +448,7 @@ packages:
     source: hosted
     version: "0.3.4+2"
   crypto:
-    dependency: "direct dev"
+    dependency: transitive
     description:
       name: crypto
       sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
@@ -1639,6 +1647,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.0.3"
+  otp_util:
+    dependency: "direct main"
+    description:
+      name: otp_util
+      sha256: dd8956c6472bacc3ffabe62c03f8a9782d1e5a5a3f2674420970f549d642b1cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   package_config:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index 98161c4b..bb7b58b5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -140,10 +140,10 @@ dependencies:
       url: https://github.com/KRTirtho/flutter_new_pipe_extractor.git
   http_parser: ^4.1.2
   collection: any
+  otp_util: ^1.0.2
 
 dev_dependencies:
   build_runner: ^2.4.13
-  crypto: ^3.0.3
   envied_generator: ^1.0.0
   flutter_gen_runner: ^5.4.0
   flutter_launcher_icons: ^0.14.2