initial commit

fluxer_api/src/channel/services/message/dmScopeUtils.ts

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import type {ChannelID, UserID} from '~/BrandedTypes';
+import {ChannelTypes} from '~/Constants';
+import type {IUserRepository} from '~/user/IUserRepository';
+
+export type DmSearchScope = 'all_dms' | 'open_dms';
+
+export interface DmScopeOptions {
+	scope: DmSearchScope;
+	userId: UserID;
+	userRepository: IUserRepository;
+	includeChannelId?: ChannelID | null;
+}
+
+export const getDmChannelIdsForScope = async ({
+	scope,
+	userId,
+	userRepository,
+	includeChannelId,
+}: DmScopeOptions): Promise<Array<string>> => {
+	const summaryResults = await userRepository.listPrivateChannelSummaries(userId);
+	const channelIdStrings = new Set<string>();
+
+	for (const summary of summaryResults) {
+		const isDm =
+			summary.channelType === ChannelTypes.DM || summary.channelType === ChannelTypes.GROUP_DM || summary.isGroupDm;
+
+		if (!isDm) {
+			continue;
+		}
+
+		if (scope === 'open_dms' && !summary.open) {
+			continue;
+		}
+
+		channelIdStrings.add(summary.channelId.toString());
+	}
+
+	if (includeChannelId) {
+		channelIdStrings.add(includeChannelId.toString());
+	}
+
+	return Array.from(channelIdStrings);
+};