Implement individual song download

src/utils/search.ts

@@ -75,3 +75,31 @@ export async function getTracks(url: string, lastReqRef: React.RefObject<number>
 
   return tracks
 }
+
+export async function getDownloadUrl(trackPageUrl: string, lastReqRef: React.RefObject<number>) {
+  const trackPageHtml = await (await politeFetch(trackPageUrl, lastReqRef)).text()
+  const $ = cheerio.load(trackPageHtml)
+
+  const audioLinks: string[] = []
+
+  $('a[href$=".mp3"], a[href$=".flac"]').each((index, link) => {
+    let href = $(link).attr('href')
+    if (!href) return
+
+    href = decodeURIComponent(href)
+    if (!href.startsWith('http')) {
+      href = `https://downloads.khinsider.com${href}`
+    }
+    audioLinks.push(href)
+  })
+
+  const flacLinks = audioLinks.filter((link) => link.endsWith('.flac'))
+  if (flacLinks.length > 0) {
+    return flacLinks[0]
+  }
+
+  const mp3Links = audioLinks.filter((link) => link.endsWith('.mp3'))
+  if (mp3Links.length > 0) {
+    return mp3Links[0]
+  }
+}