ストレージの設定

import { defineStorage } from '@aws-amplify/backend';

export const storage = defineStorage({
  name: 'amplifyTeamDrive'
});

import { defineBackend } from '@aws-amplify/backend';
import { auth } from './auth/resource';
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import { storage } from './storage/resource';

defineBackend({
  auth,
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  storage
});

git commit -am "add storage backend"
git push

export const storage = defineStorage({
  name: 'amplifyTeamDrive',
  access: (allow) => ({
    'profile-pictures/{entity_id}/*': [
      allow.guest.to(['read']),
      allow.entity('identity').to(['read', 'write', 'delete'])
    ],
    'picture-submissions/*': [
      allow.authenticated.to(['read','write']),
      allow.guest.to(['read', 'write'])
    ],
  })
});

export const firstBucket = defineStorage({
  name: 'firstBucket',
  isDefault: true, // デフォルトストレージバケットを識別（必須）
});

export const secondBucket = defineStorage({
  name: 'secondBucket',
  access: (allow) => ({
    'private/{entity_id}/*': [
      allow.entity('identity').to(['read', 'write', 'delete'])
    ]
  })
})

import { defineBackend } from '@aws-amplify/backend';
import { auth } from './auth/resource';
import { firstBucket, secondBucket } from './storage/resource';

defineBackend({
  auth,
  firstBucket,
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  secondBucket
});

import 'package:amplify_flutter/amplify_flutter.dart';

try {
  final result = await Amplify.Storage.downloadData(
    path: const StoragePath.fromString('album/2024/1.jpg'),
    options: StorageDownloadDataOptions(
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      // Amplify Backend で割り当てられた名前を使用してターゲットバケットを指定する
      bucket: StorageBucket.fromOutputs('secondBucket'),
    ),
  ).result;
} on Exception catch (e) {
    print('Error: $e');
}

import 'package:amplify_flutter/amplify_flutter.dart';

try {
  final result = await Amplify.Storage.downloadData(
    path: const StoragePath.fromString('album/2024/1.jpg'),
    options: const StorageDownloadDataOptions(
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      // または、コンソールからバケット名と関連するリージョンを指定する
      bucket: StorageBucket.fromBucketInfo(
        BucketInfo(
          bucketName: 'second-bucket-name-from-console',
          region: 'us-east-2',
        ),
      ),
    ),
  ).result;
} on Exception catch (e) {
  print('Error: $e');
}

export const storage = defineStorage({
  name: 'myProjectFiles',
  // リソースが削除されたときにバケットを保持する
  keepOnDelete: true,
});

dependencies:
  flutter:
    sdk: flutter

  amplify_auth_cognito: ^2.0.0
  amplify_flutter: ^2.0.0
  amplify_storage_s3: ^2.0.0

import 'package:amplify_auth_cognito/amplify_auth_cognito.dart';
import 'package:amplify_flutter/amplify_flutter.dart';
import 'package:amplify_storage_s3/amplify_storage_s3.dart';
import 'package:flutter/material.dart';

import 'amplify_outputs.dart';

Future<void> _configureAmplify() async {
  try {
    final auth = AmplifyAuthCognito();
    final storage = AmplifyStorageS3();
    await Amplify.addPlugins([auth, storage]);

    // アプリケーション内で初期化されたカテゴリを使用するために Amplify.configure を呼び出す
    await Amplify.configure(amplifyConfig);
  } on Exception catch (e) {
    safePrint('An error occurred configuring Amplify: $e');
  }
}

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await _configureAmplify();
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  // ...
}