closes primefaces#3446 - support invisible recaptchas

Author: cnsgithub

src/main/java/org/primefaces/component/captcha/CaptchaRenderer.java

@@ -65,6 +65,12 @@ protected void encodeMarkup(FacesContext context, Captcha captcha, String public
         captcha.setRequired(true);
         writer.startElement("div", null);
         writer.writeAttribute("id", clientId, "id");
+        
+        if (captcha.getSize() != null && "invisible".equals(captcha.getSize())) {
+            writer.writeAttribute("class", "g-recaptcha", null);
+            writer.writeAttribute("data-sitekey", publicKey, null);
+            writer.writeAttribute("data-size", "invisible", null);
+        }
 
         renderDynamicPassThruAttributes(context, captcha);
 

src/main/resources/META-INF/resources/primefaces/captcha/captcha.js

@@ -14,6 +14,7 @@ PrimeFaces.widget.Captcha = PrimeFaces.widget.BaseWidget.extend({
 
         $(document.body).append('<script src="https://www.google.com/recaptcha/api.js?onload=' + this.cfg.widgetVar + '_initCallback&render=explicit&hl=' 
                             + this.cfg.language +'" async defer>');
+
     },
 
     render: function() {
@@ -26,6 +27,10 @@ PrimeFaces.widget.Captcha = PrimeFaces.widget.BaseWidget.extend({
             'expired-callback': $this.cfg.expired,
             'size': this.cfg.size 
         });
+
+        if (this.cfg.size === 'invisible') {
+            grecaptcha.execute();
+        }
 
         window[this.cfg.widgetVar + '_initCallback'] = undefined;
     }