1 files changed, 68 insertions, 0 deletions
diff --git a/src/stackexchange-com-fixes/register.js b/src/stackexchange-com-fixes/register.js
new file mode 100644
index 0000000..b00dba1
--- /dev/null
+++ b/src/stackexchange-com-fixes/register.js
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: CC0-1.0
+ *
+ * Use Hacktcha on Stack Exchange registration page.
+ *
+ * Copyright (C) 2022 Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the CC0 1.0 Universal License as published by
+ * the Creative Commons Corporation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * CC0 1.0 Universal License for more details.
+ */
+
+/* Use with https://meta.stackexchange.com/users/signup */
+
+/* Load captcha-parent.js first. */
+
+(async () => {
+    const captcha_div = document.createElement("div");
+    const submit_but  = document.getElementById("submit-button");
+    const token_field = document.createElement("textarea");
+
+    /*
+     * Let's remove <noscript> tag with the original reCAPTCHA iframe and an
+     * unnecessary button.
+     */
+    document.querySelector("#no-captcha-here + *").remove();
+    for (const elem of [...captcha_div.childNodes])
+        elem.remove();
+
+    token_field.name = "g-recaptcha-response";
+    token_field.style.display = "none";
+
+    document.getElementById("no-captcha-here").after(token_field);
+    token_field.after(captcha_div);
+
+    /*
+     * The reCAPTCHA site key is present in 2 places: in a script and in fallback iframe's
+     * URL. Let's use the former as the source for now.
+     */
+    let site_key;
+    const site_key_regex = /['"]sitekey['"]\s*:\s*['"]([a-zA-Z0-9-]+)['"]/;
+
+    for (const script of document.scripts) {
+        match = site_key_regex.exec(script.textContent);
+        if (match !== null)
+            site_key = match[1];
+    }
+
+    if (site_key === null) {
+        console.error("Could not extract site key :(");
+        return;
+    }
+
+    submit_but.setAttribute("disabled", "");
+
+    for await (const token of HCHA.run(captcha_div, site_key)) {
+	if (token === null) {
+	    submit_but.setAttribute("disabled", "");
+	} else {
+	    token_field.value = token;
+	    submit_but.removeAttribute("disabled");
+	}
+    }
+})();