Fix upcloud

src/backend/embeds/upcloud.ts

@@ -29,6 +29,32 @@ function isJSON(json: string) {
   }
 }
 
+function extractKey(script: string): [number, number][] | null {
+  const startOfSwitch = script.lastIndexOf("switch");
+  const endOfCases = script.indexOf("partKeyStartPosition");
+  const switchBody = script.slice(startOfSwitch, endOfCases);
+
+  const nums: [number, number][] = [];
+  const matches = switchBody.matchAll(
+    /:[a-zA-Z0-9]+=([a-zA-Z0-9]+),[a-zA-Z0-9]+=([a-zA-Z0-9]+);/g
+  );
+  for (const match of matches) {
+    const innerNumbers: number[] = [];
+    for (const varMatch of [match[1], match[2]]) {
+      const regex = new RegExp(`${varMatch}=0x([a-zA-Z0-9]+)`, "g");
+      const varMatches = [...script.matchAll(regex)];
+      const lastMatch = varMatches[varMatches.length - 1];
+      if (!lastMatch) return null;
+      const number = parseInt(lastMatch[1], 16);
+      innerNumbers.push(number);
+    }
+
+    nums.push([innerNumbers[0], innerNumbers[1]]);
+  }
+
+  return nums;
+}
+
 registerEmbedScraper({
   id: "upcloud",
   displayName: "UpCloud",
@@ -54,23 +80,31 @@ registerEmbedScraper({
     let sources: { file: string; type: string } | null = null;
 
     if (!isJSON(streamRes.sources)) {
-      const decryptionKey = JSON.parse(
-        await proxiedFetch<string>(
-          `https://raw.githubusercontent.com/enimax-anime/key/e4/key.txt`
-        )
-      ) as [number, number][];
+      const scriptJs = await proxiedFetch<string>(
+        `https://rabbitstream.net/js/player/prod/e4-player.min.js`,
+        {
+          responseType: "text" as any,
+        }
+      );
+      const decryptionKey = extractKey(scriptJs);
+      if (!decryptionKey) throw new Error("Key extraction failed");
 
       let extractedKey = "";
-      const sourcesArray = streamRes.sources.split("");
-      for (const index of decryptionKey) {
-        for (let i: number = index[0]; i < index[1]; i += 1) {
-          extractedKey += streamRes.sources[i];
-          sourcesArray[i] = "";
-        }
-      }
+      let strippedSources = streamRes.sources;
+      let totalledOffset = 0;
+      decryptionKey.forEach(([a, b]) => {
+        const start = a + totalledOffset;
+        const end = start + b;
+        extractedKey += streamRes.sources.slice(start, end);
+        strippedSources = strippedSources.replace(
+          streamRes.sources.substring(start, end),
+          ""
+        );
+        totalledOffset += b;
+      });
 
       const decryptedStream = AES.decrypt(
-        sourcesArray.join(""),
+        strippedSources,
         extractedKey
       ).toString(enc.Utf8);
       const parsedStream = JSON.parse(decryptedStream)[0];