add wip controls and statuses buffer

src/util.js

@@ -1,10 +1,66 @@
-export { default as getUrls } from 'get-urls'
-export { default as getYoutubeId } from 'get-youtube-id'
+import getUrls from 'get-urls'
 
-export function isSupportedUrl(url) {
-    return (new URL(url)).hostname === 'youtube.com'
+export function isSupportedUrl(urlAsString) {
+    const url = new URL(urlAsString)
+
+    const hosts = [
+        'youtube.com',
+        'music.youtube.host'
+    ]
+
+    return hosts.includes(url.hostname) && url.searchParams.has('v')
+}
+
+export function getYoutubeVideoId(urlAsString) {
+    return new URL(urlAsString).searchParams.get('v')
 }
 
 export function intersection(xs, ys) {
     return xs.filter(x => ys.includes(x));
+}
+
+export async function fetchTimeline(url) {
+    const urlBuilder = new URL(url)
+    urlBuilder.searchParams.set('limit', 40)
+
+    const response = await fetch(url)
+    const statuses = await response.json()
+    const { next, previous } = parseLinkHeader(response.headers.get('link'))
+
+    return { statuses, nextLink: next, previousLink: previous }
+}
+
+const LINK_RE = /<(.+?)>; rel="(\w+)"/gi
+
+export function parseLinkHeader(link) {
+    const links = {}
+
+    for (const [ , url, name ] of link.matchAll(LINK_RE)) {
+        links[name] = url
+    }
+
+    return links
+}
+
+export function statusesToEntries(statuses) {
+    const entries = []
+
+    return statuses
+        .map(status => {
+            const [url] = Array.from(getUrls(status.content)).filter(isSupportedUrl)
+
+            return { status, url }
+        })
+        .filter(entry => entry.url != null)
+        .map(({ status, url }) => {
+            const id = getYoutubeVideoId(url)
+            const tags = intersection(status.tags.map(tag => tag.name), [
+                'np',
+                'nowplaying',
+                'tootradio',
+                'pouetradio'
+            ])
+
+            return { status, url, id, tags }
+        })
 }