Revision of lastfm-weekly-report.ts

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1 file changed, 131 insertions

lastfm-weekly-report.ts(file created)

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1	+	const LASTFM_API_KEY = process.env.FEED_LASTFM_API_KEY \|\| "";
2	+	const LASTFM_USERNAME = process.env.FEED_LASTFM_USERNAME \|\| "";
3	+	const LASTFM_API = "https://ws.audioscrobbler.com/2.0/";
4	+
5	+	function formatItem({
6	+	artist,
7	+	image,
8	+	name,
9	+	playcount,
10	+	url,
11	+	}: {
12	+	artist: { "#text": string };
13	+	image?: { "#text": string }[];
14	+	name: string;
15	+	playcount: string;
16	+	url: string;
17	+	}) {
18	+	return {
19	+	name: artist ? `${name} by ${artist?.["#text"]}` : name,
20	+	image: image ? image?.at(-1)?.["#text"] : undefined,
21	+	playcount,
22	+	url,
23	+	};
24	+	}
25	+
26	+	function epochToIso(epoch: string) {
27	+	const date = new Date(Number.parseInt(epoch) * 1000);
28	+	return date?.toISOString();
29	+	}
30	+
31	+	function isoToYearAndWeek(iso: string) {
32	+	const date = new Date(iso);
33	+	const year = date.getFullYear();
34	+	const firstOfYear = new Date(year, 0, 1);
35	+	const daysSinceFirstOfYear = Math.floor(
36	+	(+date - +firstOfYear) / (24 * 60 * 60 * 1000),
37	+	);
38	+	const week = Math.ceil((date.getDay() + 1 + daysSinceFirstOfYear) / 7);
39	+	return {
40	+	week,
41	+	year,
42	+	};
43	+	}
44	+
45	+	function listToHTML(
46	+	arr: {
47	+	name: string;
48	+	playcount: string;
49	+	url: string;
50	+	}[],
51	+	) {
52	+	return arr
53	+	.map(
54	+	({ name, playcount, url }) =>
55	+	`<li><a href="${url}">${name}</a> (${playcount} plays)</li>`,
56	+	)
57	+	.join("");
58	+	}
59	+
60	+	async function lastFm(method = "") {
61	+	const data = await fetch(
62	+	`${LASTFM_API}?method=${method}&api_key=${LASTFM_API_KEY}&format=json&user=${LASTFM_USERNAME}`,
63	+	);
64	+	return await data.json();
65	+	}
66	+
67	+	async function getWeeklyChartList(limit = 5) {
68	+	const data = await lastFm("user.getWeeklyChartList");
69	+	return data?.weeklychartlist?.chart?.slice(limit * -1);
70	+	}
71	+
72	+	async function getWeeklyTrackChart(to: string, from: string, limit = 5) {
73	+	const data = await lastFm(`user.getWeeklyTrackChart&from=${from}&to=${to}`);
74	+	return data?.weeklytrackchart?.track?.slice(0, limit)?.map(formatItem);
75	+	}
76	+
77	+	async function getWeeklyAlbumChart(to: string, from: string, limit = 5) {
78	+	const data = await lastFm(`user.getWeeklyAlbumChart&from=${from}&to=${to}`);
79	+	return data?.weeklyalbumchart?.album?.slice(0, limit)?.map(formatItem);
80	+	}
81	+
82	+	async function getWeeklyArtistChart(to: string, from: string, limit = 5) {
83	+	const data = await lastFm(`user.getWeeklyArtistChart&from=${from}&to=${to}`);
84	+	return data?.weeklyartistchart?.artist?.slice(0, limit)?.map(formatItem);
85	+	}
86	+
87	+	async function buildReport() {
88	+	const output = [];
89	+	const weeks = await getWeeklyChartList();
90	+	for (const week of weeks) {
91	+	output.push({
92	+	to: week.to,
93	+	from: week.from,
94	+	tracks: await getWeeklyTrackChart(week.to, week.from),
95	+	albums: await getWeeklyAlbumChart(week.to, week.from),
96	+	artists: await getWeeklyArtistChart(week.to, week.from),
97	+	});
98	+	}
99	+	return output;
100	+	}
101	+
102	+	export default async function buildFeedItems() {
103	+	const data = await buildReport();
104	+	return data
105	+	.map(({ to, from, tracks, albums, artists }) => {
106	+	const trackList = listToHTML(tracks);
107	+	const albumList = listToHTML(albums);
108	+	const artistList = listToHTML(artists);
109	+	const toIso = epochToIso(to);
110	+	const fromIso = epochToIso(from);
111	+	const { week, year } = isoToYearAndWeek(fromIso);
112	+
113	+	if (!trackList && !albumList && !artistList) {
114	+	return;
115	+	}
116	+
117	+	return {
118	+	content_html: [
119	+	artistList ? `<h2>Top Artists</h2><ol>${artistList}</ol>` : "",
120	+	albumList ? `<h2>Top Albums</h2><ol>${albumList}</ol>` : "",
121	+	trackList ? `<h2>Top Tracks</h2><ol>${trackList}</ol>` : "",
122	+	].join(""),
123	+	date_published: toIso,
124	+	id: `last.fm-${from}-${to}`,
125	+	title: "weekly last.fm report",
126	+	url: `https://www.last.fm/user/ZicklePop/listening-report/year/${year}/week/${week}`,
127	+	tags: ["last.fm"],
128	+	};
129	+	})
130	+	.filter((o) => !!o);
131	+	}

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