init

src/optifine-download-links.zomo.ts

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+// ==UserScript==
+// @name        OptiFine Download Links
+// @namespace   zomo
+// @match       https://optifine.net/*
+// @grant       none
+// @version     1.0
+// @author      zomo
+// @description automatically grab optifine links through the ads
+// ==/UserScript==
+
+const onhover = false // when to load link, false will load immediately
+
+async function getDownload(href: string): Promise<string | null> {
+    let resp = await fetch(href)
+    let text = await resp.text()
+    let match = text.match(/<a href=['"](downloadx.*?)['"]/i)
+    if (match) {
+        return match[1]
+    }
+    return null
+}
+function attachFetchDownloadLink(a: HTMLLinkElement, depth = 0) {
+    function run() {
+        a.innerText = 'Loading'
+        let url = new URL(a.href)
+        if (url.pathname === '/adloadx') {
+            getDownload(a.href).then(downloadUrl => {
+                if (downloadUrl) {
+                    a.href = downloadUrl
+                    a.innerText = 'Download'
+                } else {
+                    a.innerText = 'Failed'
+                    if (onhover) attachFetchDownloadLink(a, ++depth)
+                    else
+                        setTimeout(
+                            () => attachFetchDownloadLink(a, ++depth),
+                            1000
+                        )
+                }
+            })
+        }
+    }
+    if (depth > 5) return
+
+    if (onhover) {
+        a.addEventListener('mouseover', run, { once: true })
+    } else {
+        run()
+    }
+}
+addEventListener('load', () => {
+    document.querySelectorAll<HTMLLinkElement>('a').forEach(a => {
+        let href = new URL(a.href)
+        if (href.hostname === 'adfoc.us') {
+            let params = href.searchParams
+            if (params.has('url')) {
+                let url = params.get('url')?.replace('http://', 'https://')
+                if (url) {
+                    a.href = url
+                    attachFetchDownloadLink(a)
+                }
+            }
+        }
+    })
+})