Add data layer for GetEmailContent

lib/features/email/data/datasource/email_datasource.dart

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+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+
+abstract class EmailDataSource {
+  Future<Email> getEmailContent(AccountId accountId, EmailId emailId);
+}

lib/features/email/data/datasource_impl/email_datasource_impl.dart

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+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:tmail_ui_user/features/email/data/datasource/email_datasource.dart';
+import 'package:tmail_ui_user/features/email/data/network/email_api.dart';
+
+class EmailDataSourceImpl extends EmailDataSource {
+
+  final EmailAPI emailAPI;
+
+  EmailDataSourceImpl(this.emailAPI);
+
+  @override
+  Future<Email> getEmailContent(AccountId accountId, EmailId emailId) {
+    return Future.sync(() async {
+      return await emailAPI.getEmailContent(accountId, emailId);
+    }).catchError((error) {
+      throw error;
+    });
+  }
+}

lib/features/email/data/network/email_api.dart

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+import 'dart:async';
+
+import 'package:jmap_dart_client/http/http_client.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/properties/properties.dart';
+import 'package:jmap_dart_client/jmap/jmap_request.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:jmap_dart_client/jmap/mail/email/get/get_email_method.dart';
+import 'package:jmap_dart_client/jmap/mail/email/get/get_email_response.dart';
+
+class EmailAPI {
+
+  final HttpClient httpClient;
+
+  EmailAPI(this.httpClient);
+
+  Future<Email> getEmailContent(AccountId accountId, EmailId emailId) async {
+    final processingInvocation = ProcessingInvocation();
+
+    final jmapRequestBuilder = JmapRequestBuilder(httpClient, processingInvocation);
+
+    final getEmailMethod = GetEmailMethod(accountId)
+      ..addIds({emailId.id})
+      ..addProperties(Properties({'bodyValues', 'htmlBody', 'attachments'}))
+      ..addFetchHTMLBodyValues(true);
+
+    final getEmailInvocation = jmapRequestBuilder.invocation(getEmailMethod);
+
+    final result = await (jmapRequestBuilder
+        ..usings(getEmailMethod.requiredCapabilities))
+      .build()
+      .execute();
+
+    final resultList = result.parse<GetEmailResponse>(
+        getEmailInvocation.methodCallId, GetEmailResponse.deserialize);
+
+    return Future.sync(() async {
+      return resultList!.list.first;
+    }).catchError((error) {
+      throw error;
+    });
+  }
+}

lib/features/email/data/repository/email_repository_impl.dart

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+
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:tmail_ui_user/features/email/data/datasource/email_datasource.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/email_repository.dart';
+
+class EmailRepositoryImpl extends EmailRepository {
+
+  final EmailDataSource emailDataSource;
+
+  EmailRepositoryImpl(this.emailDataSource);
+
+  @override
+  Future<Email> getEmailContent(AccountId accountId, EmailId emailId) {
+    return emailDataSource.getEmailContent(accountId, emailId);
+  }
+}