Create savefrom.js

lib/savefrom.js

@@ -0,0 +1,81 @@
+import got from "got";
+import vm from "vm";
+import { DEFAULT_HEADERS } from "./constant.js";
+import { generateHash } from "./util.js";
+import { SavefromArgsSchema, SavefromSchema } from "../lib/types/savefrom-v1.js";
+
+export default async function savefrom(url) {
+    SavefromArgsSchema.parse(arguments);
+
+    const form = {
+        sf_url: url,
+        sf_submit: "",
+        new: "2",
+        lang: "en",
+        app: "",
+        country: "en",
+        os: "Windows",
+        browser: "Chrome",
+        channel: "main",
+        "sf-nomad": "1",
+        url,
+        ts: Date.now(),
+        _ts: 1720433117117,
+        _tsc: 0,
+        _s: generateHash(url),
+        _x: 1,
+    };
+
+    const data = await got
+        .post("https://worker.savefrom.net/savefrom.php", {
+            headers: {
+                ...DEFAULT_HEADERS,
+                "content-type": "application/x-www-form-urlencoded",
+                origin: "https://en.savefrom.net",
+                referer: "https://en.savefrom.net/",
+            },
+            form,
+        })
+        .text();
+
+    const context = {
+        results: null,
+        parent: { document: { location: {} } },
+        frameElement: {},
+        atob: (base64) => Buffer.from(base64, "base64").toString(),
+        _decodeURIComponent: (uri) => {
+            const decoded = decodeURIComponent(uri);
+            if (/showResult/.test(decoded)) {
+                context.results = decoded;
+                return "true";
+            }
+            return decoded;
+        },
+    };
+
+    vm.createContext(context);
+    new vm.Script(`decodeURIComponent=_decodeURIComponent;${data}`).runInContext(context);
+
+    const executed =
+        context.results?.split("window.parent.sf.videoResult.show(")?.[1] ||
+        context.results?.split("window.parent.sf.videoResult.showRows(")?.[1];
+
+    if (!executed) {
+        throw new Error("Cannot find result from evaluation!");
+    }
+
+    let json = null;
+    try {
+        if (context.results?.includes("showRows")) {
+            const splits = executed.split('],"');
+            const lastIndex = splits.findIndex((v) => v.includes("window.parent.sf.enableElement"));
+            json = JSON.parse(splits.slice(0, lastIndex).join('],"') + "]");
+        } else {
+            json = [JSON.parse(executed.split(");")[0])];
+        }
+    } catch (e) {
+        throw new Error("Cannot parse JSON results data from evaluation!");
+    }
+
+    return SavefromSchema.parse(json);
+}