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fluxer_app/src/components/channel/messageAttachmentUtils.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 {MessageAttachment} from '~/records/MessageRecord';
+
+export const isImageType = (contentType?: string): boolean => contentType?.startsWith('image/') ?? false;
+
+export const isVideoType = (contentType?: string): boolean => contentType?.startsWith('video/') ?? false;
+
+export const isAudioType = (contentType?: string): boolean => contentType?.startsWith('audio/') ?? false;
+
+export const isGifType = (contentType?: string): boolean => contentType === 'image/gif';
+
+const hasDimensions = (attachment: MessageAttachment): boolean =>
+	typeof attachment.width === 'number' && typeof attachment.height === 'number';
+
+export const isMediaAttachment = (attachment: MessageAttachment): boolean =>
+	hasDimensions(attachment) &&
+	(isImageType(attachment.content_type) ||
+		isVideoType(attachment.content_type) ||
+		isAudioType(attachment.content_type));
+
+export function splitMediaAndFileAttachments(attachments: ReadonlyArray<MessageAttachment>): {
+	mediaAttachments: Array<MessageAttachment>;
+	fileAttachments: Array<MessageAttachment>;
+} {
+	const mediaAttachments: Array<MessageAttachment> = [];
+	const fileAttachments: Array<MessageAttachment> = [];
+
+	for (const attachment of attachments) {
+		if (isMediaAttachment(attachment)) {
+			mediaAttachments.push(attachment);
+		} else {
+			fileAttachments.push(attachment);
+		}
+	}
+
+	return {mediaAttachments, fileAttachments};
+}