src/routes/mangadex/manga/+server.ts


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export const GET = async ({ url }) => {
	const nullIfNullString = (s) => (s === 'null' ? null : s);
	const get = async (title) => {
		return await (
			await fetch(
				`https://api.mangadex.org/manga?title=${encodeURIComponent(
					title
				)}&year=${url.searchParams.get('year')}`
			)
		).json();
	};

	let mangadexData = await get(
		nullIfNullString(url.searchParams.get('native')) ||
			nullIfNullString(url.searchParams.get('english')) ||
			nullIfNullString(url.searchParams.get('romaji')) ||
			''
	);

	if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
		mangadexData = await get(nullIfNullString(url.searchParams.get('english')) || '');

		if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
			mangadexData = await get(nullIfNullString(url.searchParams.get('romaji')) || '');
		}
	}

	return Response.json(mangadexData);
};