fix: go back to otpauth instead of converting to json

auth/lib/models/code.dart

@@ -1,3 +1,5 @@
+import 'dart:convert';
+
 import 'package:ente_auth/models/code_display.dart';
 import 'package:ente_auth/utils/totp_util.dart';
 import 'package:flutter/foundation.dart';
@@ -105,7 +107,7 @@ class Code {
         _getType(uri),
         _getCounter(uri),
         rawData,
-        display: display,
+        display: CodeDisplay.fromUri(uri),
       );
     } catch (e) {
       // if account name contains # without encoding,
@@ -148,11 +150,10 @@ class Code {
     }
   }
 
-  Map<String, dynamic> toExportJson() {
-    return {
-      'rawData': rawData,
-      if (display != null) 'display': display?.toJson(),
-    };
+  String toExportFormat() {
+    return Uri.parse(
+      rawData + "&codeDisplay=" + jsonEncode(display ?? CodeDisplay()),
+    ).toString();
   }
 
   static String _getIssuer(Uri uri) {

auth/lib/models/code_display.dart

@@ -1,15 +1,19 @@
+import 'dart:convert';
+
 /// Used to store the display settings of a code.
 class CodeDisplay {
   final bool pinned;
   final bool trashed;
   final int lastUsedAt;
   final int tapCount;
+  final List<String> tags;
 
   CodeDisplay({
     this.pinned = false,
     this.trashed = false,
     this.lastUsedAt = 0,
     this.tapCount = 0,
+    this.tags = const [],
   });
 
   // copyWith
@@ -18,16 +22,20 @@ class CodeDisplay {
     bool? trashed,
     int? lastUsedAt,
     int? tapCount,
+    List<String>? tags,
   }) {
     final bool updatedPinned = pinned ?? this.pinned;
     final bool updatedTrashed = trashed ?? this.trashed;
     final int updatedLastUsedAt = lastUsedAt ?? this.lastUsedAt;
     final int updatedTapCount = tapCount ?? this.tapCount;
+    final List<String> updatedTags = tags ?? this.tags;
+
     return CodeDisplay(
       pinned: updatedPinned,
       trashed: updatedTrashed,
       lastUsedAt: updatedLastUsedAt,
       tapCount: updatedTapCount,
+      tags: updatedTags,
     );
   }
 
@@ -43,6 +51,14 @@ class CodeDisplay {
     );
   }
 
+  static CodeDisplay? fromUri(Uri uri) {
+    if (!uri.queryParameters.containsKey("codeDisplay")) return null;
+    final String codeDisplay = uri.queryParameters['codeDisplay']!;
+    final decodedDisplay = jsonDecode(codeDisplay);
+
+    return CodeDisplay.fromJson(decodedDisplay);
+  }
+
   Map<String, dynamic> toJson() {
     return {
       'pinned': pinned,

auth/lib/store/code_store.dart

@@ -80,14 +80,14 @@ class CodeStore {
       result = AddResult.updateCode;
       await _authenticatorService.updateEntry(
         code.generatedID!,
-        jsonEncode(code.toExportJson()),
+        code.toExportFormat(),
         shouldSync,
         mode,
       );
     } else {
       result = AddResult.newCode;
       code.generatedID = await _authenticatorService.addEntry(
-        jsonEncode(code.toExportJson()),
+        code.toExportFormat(),
         shouldSync,
         mode,
       );

auth/lib/ui/settings/data/export_widget.dart

@@ -172,13 +172,10 @@ Future<void> _exportCodes(BuildContext context, String fileContent) async {
 
 Future<String> _getAuthDataForExport() async {
   final codes = await CodeStore.instance.getAllCodes();
-  List<Map<String, dynamic>> items = [];
+  String data = "";
   for (final code in codes) {
-    items.add(code.toExportJson());
+    data += "${code.rawData}\n";
   }
-  final data = {
-    "items": items,
-  };
 
-  return jsonEncode(data);
+  return data;
 }