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check fetched theme data sha256 hash

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This commit is contained in:
julian 2023-05-10 13:21:08 -06:00
parent 9e39d995e2
commit 7c4237f8f8
1 changed files with 21 additions and 5 deletions
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26
lib/themes/theme_service.dart
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@ -3,6 +3,7 @@ import 'dart:io';
import 'dart:typed_data'; import 'dart:typed_data';
import 'package:archive/archive_io.dart'; import 'package:archive/archive_io.dart';
import 'package:crypto/crypto.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart'; import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:http/http.dart'; import 'package:http/http.dart';
import 'package:isar/isar.dart'; import 'package:isar/isar.dart';
@ -136,15 +137,27 @@ class ThemeService {
} }
} }
Future<ByteData> fetchTheme({required String themeId}) async { Future<ByteData> fetchTheme({
required StackThemeMetaData themeMetaData,
}) async {
try { try {
final response = await get(Uri.parse("$baseServerUrl/theme/$themeId")); final response =
await get(Uri.parse("$baseServerUrl/theme/${themeMetaData.id}"));
final bytes = response.bodyBytes; final bytes = response.bodyBytes;
final result = ByteData.view(bytes.buffer); // verify hash
final digest = sha256.convert(bytes);
if (digest.toString() == themeMetaData.sha256) {
final result = ByteData.view(bytes.buffer);
return result; return result;
} else {
throw Exception(
"Fetched theme archive sha256 hash ($digest) does not"
" match requested $themeMetaData",
);
}
} catch (e, s) { } catch (e, s) {
Logging.instance.log( Logging.instance.log(
"Failed to fetch themes list: $e\n$s", "Failed to fetch themes list: $e\n$s",
@ -164,10 +177,12 @@ class ThemeService {
class StackThemeMetaData { class StackThemeMetaData {
final String name; final String name;
final String id; final String id;
final String sha256;
StackThemeMetaData({ StackThemeMetaData({
required this.name, required this.name,
required this.id, required this.id,
required this.sha256,
}); });
static StackThemeMetaData fromMap(Map<String, dynamic> map) { static StackThemeMetaData fromMap(Map<String, dynamic> map) {
@ -175,6 +190,7 @@ class StackThemeMetaData {
return StackThemeMetaData( return StackThemeMetaData(
name: map["name"] as String, name: map["name"] as String,
id: map["id"] as String, id: map["id"] as String,
sha256: map["sha256"] as String,
); );
} catch (e, s) { } catch (e, s) {
Logging.instance.log( Logging.instance.log(
@ -187,6 +203,6 @@ class StackThemeMetaData {
@override @override
String toString() { String toString() {
return "$runtimeType(name: $name, id: $id)"; return "$runtimeType(name: $name, id: $id, sha256: $sha256)";
} }
} }