add cookie usage banner utility script (#28449)

plonetheme/pcfweb/static/js/cookie_usage_consent.js

@@ -0,0 +1,81 @@
+var hostname = document.location.hostname.split('.');
+var domain;
+var path = ";path=/";
+if (hostname.length > 2) {
+    domain = '.' + hostname.slice(1, hostname.length).join('.');
+} else {
+    domain = '.' + document.location.hostname;
+}
+domain = ";domain=" + domain;
+
+
+function get_cookie(cookie_name) {
+    if (document.cookie.length > 0) {
+        start = document.cookie.indexOf(cookie_name + "=");
+        if (start < 0) return null;
+        end = document.cookie.indexOf(";", start);
+        if (end == -1) { end = document.cookie.length; }
+        return unescape(document.cookie.substring(start, end));
+    }
+    return null;
+}
+
+function has_consent() {
+    return navigator.doNotTrack != '1' && get_cookie('hasConsent') == 'hasConsent=true';
+}
+
+function purge_cookie(cookie_name) {
+    var expiration = "Thu, 01-Jan-1970 00:00:01 GMT";
+    document.cookie = cookie_name + "=" + path + ";expires=" + expiration;
+}
+
+function purge_ga_cookies() {
+    var names = ["__utma","__utmb","__utmc","__utmz", "__utmt", "_ga", "_gat"]
+    for (var i = 0; i < names.length; i++) {
+        purge_cookie(names[i]);
+    }
+}
+
+function get_expiration() {
+    var date = new Date();
+    date.setMonth(date.getMonth() + 1);
+    var expires = ";expires="+date.toGMTString();
+    return expires;
+}
+
+function close_banner() {
+    var div = document.getElementById('consent_banner');
+    div.style.display = 'none';
+}
+
+function ga_refuse() {
+    document.cookie = 'hasConsent=false'+ get_expiration() + path + domain;
+    var banner = document.getElementById('consent_banner');
+    banner.innerHTML='Vous vous êtes opposé au dépôt de cookies de mesures \
+d\'audience dans votre navigateur.';
+    window.setTimeout(function() { banner.style.display = 'none'; return true; }, 5000);
+    purge_ga_cookies();
+}
+
+function consent_banner() {
+    var body = document.getElementsByTagName('body')[0];
+    var banner = document.createElement('div');
+    var content = '<button type="button" onclick="javascript:close_banner()" title="Utiliser ce bouton signifie acceptation du suivi">×</button>';
+    content += 'En poursuivant votre navigation sur ce site, vous acceptez l\'utilisation de cookies à des fins de mesure d\'audience.';
+    content += '<div class="actions"><span class="accept"><a href="javascript:close_banner()">Accepter le suivi</a></span> / <span class="refuse"><a href="javascript:ga_refuse()">M\'opposer au suivi</a></span></div>';
+    banner.setAttribute('id', 'consent_banner');
+    banner.innerHTML = content;
+    body.insertBefore(banner, body.firstChild);
+    /* no action is accepting */
+    document.cookie = 'hasConsent=true'+ get_expiration() + path + domain;
+}
+
+if (navigator.doNotTrack != '1') {
+    var consent_cookie = get_cookie('hasConsent');
+
+    if (!consent_cookie) {
+        window.onload = consent_banner;
+    } else {
+        if (!has_consent()) {purge_ga_cookies();}
+    }
+}