payment hash added to captcha for server-side verification

lnbits/extensions/captcha/static/js/captcha.js

@@ -44,6 +44,10 @@ document.addEventListener("DOMContentLoaded", function() {
 });
 
 function receiveMessage(event){
+   if (event.data.includes("paymenthash")){
+        // console.log("paymenthash received: ", event.data);
+        document.getElementById("captchapayhash").value = event.data.split("_")[1];
+   }
    if (event.data.includes("removetheiframe")){
       if (event.data.includes("nok")){
         //invoice was NOT paid

lnbits/extensions/captcha/templates/captcha/display.html

@@ -143,6 +143,8 @@
                       )
                     }
 
+                    parent.window.postMessage("paymenthash_"+response.data.payment_hash, "*");
+
                     self.$q.notify({
                       type: 'positive',
                       message: 'Payment received!',

lnbits/extensions/captcha/templates/captcha/index.html

@@ -365,7 +365,8 @@
 
         var captchasnippet = '<!-- Captcha Checkbox Start -->\n'
           + '<input type="checkbox" id="captchacheckbox">\n'
-          + '<label for="captchacheckbox">I\'m not a robot</label>\n'
+          + '<label for="captchacheckbox">I\'m not a robot</label><br/>\n'
+          + '<input type="text" id="captchapayhash" style="display: none;"/>\n'
           + '<script type="text/javascript" src="'+ locationPath +'static/js/captcha.js" id="captchascript" data-captchaid="'+ captchaId +'">\n'
           + '<\/script>\n'
           + '<!-- Captcha Checkbox End -->';