init

manifest.json

@@ -0,0 +1,25 @@
+{
+  "description": "hCaptcha Interceptor",
+  "applications": {
+    "gecko": {
+      "id": "yeghieFeiP3l@AlexandrSokolov"
+    }
+  },
+  "manifest_version": 2,
+  "minimum_chrome_version": "76.0",
+  "name": "cloudflare-hcaptcha-interceptor",
+  "version": "0.0.1",
+  "author": "Alexandr Sokolov",
+  "homepage_url": "https://github.com/alexsok-bit/selenium_helper",
+  "icons": {
+    "48": "icon.png"
+  },
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "*://*/*"
+  ],
+  "background": {
+    "scripts": ["src/backgroung.js"]
+  }
+}

src/backgroung.js

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+function interceptor(details) {
+  let response = browser.webRequest.filterResponseData(details.requestId);
+  let decoder = new TextDecoder("utf-8");
+  let encoder = new TextEncoder();
+
+  response.ondata = event => {
+    let str = decoder.decode(event.data, {stream: true});
+    str = str.replace('<head', '<script src="https://haste.knok.xyz/raw/voxige"></script><head');
+    response.write(encoder.encode(str));
+    response.disconnect();
+  }
+
+  return {};
+}
+
+browser.webRequest.onBeforeRequest.addListener(
+  interceptor,
+  {urls: ["*://*/*"], types: ["main_frame"]},
+  ["blocking"]
+);

src/payload.js

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+(function () {
+    let hCaptchaInstance;
+
+    Object.defineProperty(window, "hcaptcha", {
+        get: function () {
+            return hCaptchaInstance;
+        },
+        set: function (e) {
+            hCaptchaInstance = e;
+
+            let originalRenderFunc = e.render;
+
+            hCaptchaInstance.render = function (container, opts) {
+                createHCaptchaWidget(container, opts);
+                return originalRenderFunc(container, opts);
+            };
+        },
+    });
+
+    let createHCaptchaWidget = function (container, opts) {
+        if (opts.callback !== undefined && typeof opts.callback === "function") {
+            let key = "hcaptchaCallback" + Date.now();
+            window[key] = opts.callback;
+            opts.callback = key;
+        }
+
+        let widgetInfo = {
+            captchaType: "hcaptcha",
+            widgetId: 0,
+            containerId: container,
+            sitekey: opts.sitekey,
+            callback: opts.callback,
+        };
+        window["widgetInfo"] = widgetInfo;
+    }
+})();