fix(auth): support stream codes completely

auth/lib/utils/totp_util.dart

@@ -1,8 +1,12 @@
 import 'package:ente_auth/models/code.dart';
 import 'package:flutter/foundation.dart';
 import 'package:otp/otp.dart' as otp;
+import 'package:steam_totp/steam_totp.dart';
 
 String getOTP(Code code) {
+  if (code.issuer.toLowerCase() == 'steam') {
+    return _getSteamCode(code);
+  }
   if (code.type == Type.hotp) {
     return _getHOTPCode(code);
   }
@@ -26,7 +30,18 @@ String _getHOTPCode(Code code) {
   );
 }
 
+String _getSteamCode(Code code, [bool isNext = false]) {
+  final SteamTOTP steamtotp = SteamTOTP(secret: code.secret);
+
+  return steamtotp.generate(
+    DateTime.now().millisecondsSinceEpoch ~/ 1000 + (isNext ? code.period : 0),
+  );
+}
+
 String getNextTotp(Code code) {
+  if (code.issuer.toLowerCase() == 'steam') {
+    return _getSteamCode(code, true);
+  }
   return otp.OTP.generateTOTPCodeString(
     getSanitizedSecret(code.secret),
     DateTime.now().millisecondsSinceEpoch + code.period * 1000,

auth/pubspec.lock

@@ -745,6 +745,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.0"
+  hashlib:
+    dependency: transitive
+    description:
+      name: hashlib
+      sha256: "67e640e19cc33070113acab3125cd48ebe480a0300e15554dec089b8878a729f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.16.0"
+  hashlib_codecs:
+    dependency: transitive
+    description:
+      name: hashlib_codecs
+      sha256: "49e2a471f74b15f1854263e58c2ac11f2b631b5b12c836f9708a35397d36d626"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
   hex:
     dependency: transitive
     description:
@@ -1439,6 +1455,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.11.1"
+  steam_totp:
+    dependency: "direct main"
+    description:
+      name: steam_totp
+      sha256: "3c09143c983f6bb05bb53e9232f9d40bbcc01c596ba0273c3e6bb246729abfa1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.0.1"
   step_progress_indicator:
     dependency: "direct main"
     description:

auth/pubspec.yaml

@@ -94,6 +94,7 @@ dependencies:
   sqflite_common_ffi: ^2.3.0+4
   sqlite3: ^2.1.0
   sqlite3_flutter_libs: ^0.5.19+1
+  steam_totp: ^0.0.1
   step_progress_indicator: ^1.0.2
   styled_text: ^8.1.0
   tray_manager: ^0.2.1