[Google Forms] Support forms with reCAPTCHA

3 files changed, 96 insertions, 3 deletions

diff --git a/src/docs-google-com-fix-forms/google-forms-hacktcha.js b/src/docs-google-com-fix-forms/google-forms-hacktcha.js
new file mode 100644
index 0000000..e37f095
--- /dev/null
+++ b/src/docs-google-com-fix-forms/google-forms-hacktcha.js
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: CC0-1.0
+ *
+ * Code to run Hacktcha on Google forms.
+ *
+ * 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 strict";
+
+(async () => {
+    const recaptcha_div = document.getElementById("recaptcha");
+
+    if (recaptcha_div === null)
+	return;
+
+    recaptcha_div.style.display = "block";
+
+    const site_key = recaptcha_div.getAttribute("data-sitekey");
+
+    const token_field = document.createElement("textarea");
+    token_field.name = "g-recaptcha-response";
+    token_field.style.display = "none";
+    recaptcha_div.before(token_field);
+
+    let authenticated = false;
+
+    /* Function called from google_forms.js. */
+    window.hacktcha_completed = function() {
+	return authenticated;
+    }
+
+    const submit_buttons = [...document.querySelectorAll('[jsname=M2UYVd]')];
+
+    for (const button of submit_buttons) {
+	button._color_orig = getComputedStyle(button)["background-color"];
+	button.style.backgroundColor = "lightgray";
+    }
+
+    for await (const token of HCHA.run(recaptcha_div, site_key)) {
+	if (token === null) {
+	    authenticated = false;
+
+	    for (const button of submit_buttons)
+		button.style.backgroundColor = "lightgray";
+	} else {
+	    authenticated = true;
+
+	    for (const button of submit_buttons)
+		button.style.backgroundColor = button._color_orig;
+
+	    token_field.value = token;
+	}
+    }
+})();
diff --git a/src/docs-google-com-fix-forms/google_forms.js b/src/docs-google-com-fix-forms/google_forms.js
index 4652426..73d6840 100644
--- a/src/docs-google-com-fix-forms/google_forms.js
+++ b/src/docs-google-com-fix-forms/google_forms.js
@@ -82,7 +82,19 @@ document.querySelectorAll('[jsname=LwH6nd]').forEach(n => n.remove());
 
 /* Enable the form sumbission button (if any). */
 for (const submit_but of document.querySelectorAll('[jsname=M2UYVd]'))
-    submit_but.addEventListener("click", () => form.submit());
+    submit_but.addEventListener("click", () => {
+	/*
+	 * hacktcha_completed() will be defined by google-forms-hacktcha.js but only
+	 * if we have the actual captcha support enabled. It will return true if
+	 * we're already authenticated.
+	 */
+	if (typeof window.hacktcha_completed === "function") {
+	    if (!window.hacktcha_completed())
+		return;
+	}
+
+	form.submit()
+    });
 
 /* Enable the "next page" button (if any). */
 function goToNext()
@@ -109,6 +121,5 @@ for (const warning of
    * support dropdown inputs
    * support "other" radio buttons and "other" checkbox buttons, in which the
      user types text in addition to selecting the "other" box
- * support reCAPTCHA integration
  * support displaying public analytics ("viewanalytics" instead of "viewform")
 */
diff --git a/src/docs-google-com-fix-forms/index.json b/src/docs-google-com-fix-forms/index.json
index c74688a..5aad90d 100644
--- a/src/docs-google-com-fix-forms/index.json
+++ b/src/docs-google-com-fix-forms/index.json
@@ -17,7 +17,7 @@
 	"identifier":   "docs-google-com-fix-forms",
 	"long_name":    "Google Forms submission fix",
 	"uuid":         "23f51630-6118-4ef2-9709-2a1dba7ebb52",
-	"version":      [2022, 8, 16],
+	"version":      [2022, 8, 17],
 	"revision":     1,
 	"description":  "Enable filling and submitting of Google Forms without relying on site-served JavaScript.",
 	"dependencies": [],
@@ -33,6 +33,25 @@
 	    }
 	}
     }, {
+	"type":         "mapping_and_resource",
+	"identifier":   "docs-google-com-fix-forms-hacktcha",
+	"long_name":    "Google Forms submission fix (with reCAPTCHA/Hacktcha support)",
+	"uuid":         "a8433924-102b-482a-9958-f7e8880f539e",
+	"version":      [2022, 8, 17],
+	"revision":     1,
+	"description":  "Enable filling and submitting of Google Forms without relying on site-served JavaScript. Also submit forms with reCAPTCHA challenge.",
+	"dependencies": [{"identifier": "hacktcha"}, {"identifier": "docs-google-com-fix-forms"}],
+	"scripts":      [{"file": "google-forms-hacktcha.js"}],
+	"payloads": {
+	    // same as above
+	    "https://docs.google.com/forms/d/**": {
+		"identifier": "docs-google-com-fix-forms-hacktcha"
+	    },
+	    "https://docs.google.com/forms/u/1/d/**": {
+		"identifier": "docs-google-com-fix-forms-hacktcha"
+	    }
+	}
+    }, {
 	"type":	        "mapping",
 	"identifier":   "google-forms-fix",
 	"long_name":    "Google Forms submission fix (transitional package)",