Function findScreenshotObjectKey

packages/web-backend/src/Videos/index.ts:44–73

(
	contents: ReadonlyArray<ScreenshotObject>,
)

	return Number.isFinite(time) ? time : null;
};
export const findScreenshotObjectKey = (
	contents: ReadonlyArray<ScreenshotObject>,
) => {
	const candidates = contents
		.map((item): ScreenshotCandidate | null => {
			const key = item.Key;
			if (!key) return null;
			const suffixIndex = SCREENSHOT_OBJECT_KEY_SUFFIXES.findIndex((suffix) =>
				key.endsWith(suffix),
			);
			if (suffixIndex < 0) return null;
			return {
				key,
				suffixIndex,
				lastModified: getScreenshotObjectTime(item.LastModified),
			};
		})
		.filter((item): item is ScreenshotCandidate => item !== null)
		.sort((a, b) => {
			if (a.lastModified !== null || b.lastModified !== null) {
				const timeDiff =
					(b.lastModified ?? Number.NEGATIVE_INFINITY) -
					(a.lastModified ?? Number.NEGATIVE_INFINITY);
				if (timeDiff !== 0) return timeDiff;
			}
			return a.suffixIndex - b.suffixIndex;
		});

	return candidates[0]?.key ?? null;
};
const getFileExtensionFromKey = (fileKey: string) => {
	const fileName = fileKey.split("/").at(-1) ?? "";
	const extension = fileName.split(".").at(-1)?.toLowerCase();