GDPR-Content-Blocker/gdpr-content-blocker/assets/frontend.js

/**
 * Content Blocker – frontend.js
 * Click-to-load: the real iframe is CREATED only after the user actively
 * consents per service. Consent is stored in localStorage per service id.
 */

( function () {
	'use strict';

	const STORAGE_PREFIX = 'cb_consent_';
	const CFG = window.cbConfig || { services: [], i18n: {} };

	/* ───────────────────────── consent storage ───────────────────────── */

	function hasConsent( serviceId ) {
		try {
			return localStorage.getItem( STORAGE_PREFIX + serviceId ) === '1';
		} catch ( e ) {
			return false;
		}
	}

	function grantConsent( serviceId ) {
		try {
			localStorage.setItem( STORAGE_PREFIX + serviceId, '1' );
		} catch ( e ) {
			// localStorage unavailable; allow the load for this session only.
		}
	}

	/* ───────────────────────── iframe loading ────────────────────────── */

	/** Replace a .cb-blocker element with the real iframe. src comes from data-src. */
	function loadContent( blockerEl ) {
		const src = blockerEl.dataset.src;
		if ( ! src ) {
			blockerEl.remove();
			return;
		}

		const iframe = document.createElement( 'iframe' );

		if ( blockerEl.dataset.width )  iframe.width  = blockerEl.dataset.width;
		if ( blockerEl.dataset.height ) iframe.height = blockerEl.dataset.height;

		iframe.setAttribute( 'loading', 'lazy' );
		iframe.setAttribute( 'allowfullscreen', '' );
		iframe.setAttribute( 'referrerpolicy', 'no-referrer-when-downgrade' );
		iframe.setAttribute( 'data-cb-loaded', '1' ); // mark as ours (observer skips)

		// Set src last — this is the moment the network request is made.
		iframe.src = src;

		blockerEl.parentNode.replaceChild( iframe, blockerEl );
	}

	function loadPreConsented() {
		document.querySelectorAll( '.cb-blocker[data-cb-id]' ).forEach( function ( el ) {
			const id = el.dataset.cbId;
			if ( id && hasConsent( id ) ) {
				loadContent( el );
			}
		} );
	}

	/* ───────────────────────── consent buttons ───────────────────────── */

	function attachButtons() {
		document.addEventListener( 'click', function ( e ) {
			const btn = e.target.closest( '.cb-blocker__button' );
			if ( ! btn ) return;

			const serviceId = btn.dataset.cbId;
			if ( ! serviceId ) return;

			const wrapper = btn.closest( '.cb-blocker' );

			// "Remember" checkbox (default checked): persist consent only when
			// ticked; otherwise load this embed once without storing consent.
			const remember = wrapper
				? wrapper.querySelector( '.cb-blocker__remember-cb' )
				: null;
			if ( ! remember || remember.checked ) {
				grantConsent( serviceId );
			}

			if ( wrapper ) {
				loadContent( wrapper );
			}
		} );
	}

	/* ───────────────────────── revoke (Art. 7 (3)) ───────────────────── */

	window.cbRevokeAll = function () {
		try {
			const keysToRemove = [];
			for ( let i = 0; i < localStorage.length; i++ ) {
				const key = localStorage.key( i );
				if ( key && key.indexOf( STORAGE_PREFIX ) === 0 ) {
					keysToRemove.push( key );
				}
			}
			keysToRemove.forEach( function ( k ) {
				localStorage.removeItem( k );
			} );
		} catch ( e ) {
			// Silently ignore if localStorage is unavailable.
		}
		window.location.reload();
	};

	/* ─────────────── client-side detection (JS-injected iframes) ─────────────── */

	/** Find a configured service whose match pattern is contained in the URL. */
	function findService( url ) {
		if ( ! url ) return null;
		const list = CFG.services || [];
		for ( let i = 0; i < list.length; i++ ) {
			if ( list[ i ].match && url.indexOf( list[ i ].match ) !== -1 ) {
				return list[ i ];
			}
		}
		return null;
	}

	/** Convert a YouTube/Vimeo watch URL into its embeddable URL. */
	function toEmbedUrl( url ) {
		let m = url.match( /(?:youtube\.com\/(?:watch\?v=|embed\/)|youtu\.be\/)([\w-]+)/ );
		if ( m ) return 'https://www.youtube.com/embed/' + m[ 1 ];
		m = url.match( /(?:player\.)?vimeo\.com\/(?:video\/)?(\d+)/ );
		if ( m ) return 'https://player.vimeo.com/video/' + m[ 1 ];
		return url;
	}

	/** Build a consent placeholder element (mirrors PHP render_placeholder). */
	function buildPlaceholder( svc, src, dims ) {
		const i18n = CFG.i18n || {};
		dims = dims || {};

		const wrap = document.createElement( 'div' );
		wrap.className = 'cb-blocker';
		wrap.setAttribute( 'data-cb-id', svc.id );
		wrap.dataset.src = src;
		if ( dims.width )  wrap.dataset.width  = dims.width;
		if ( dims.height ) wrap.dataset.height = dims.height;
		if ( dims.height && /^\d+$/.test( String( dims.height ) ) ) {
			wrap.style.minHeight = dims.height + 'px';
		}

		const inner = document.createElement( 'div' );
		inner.className = 'cb-blocker__inner';

		const text = document.createElement( 'p' );
		text.className = 'cb-blocker__text';
		if ( svc.placeholder ) {
			text.textContent = svc.placeholder;
		} else {
			const tpl = i18n.defaultText || '%s';
			const parts = tpl.split( '%s' );
			text.appendChild( document.createTextNode( parts[ 0 ] || '' ) );
			const strong = document.createElement( 'strong' );
			strong.textContent = svc.name;
			text.appendChild( strong );
			text.appendChild( document.createTextNode( parts[ 1 ] || '' ) );
		}
		inner.appendChild( text );

		const rec = document.createElement( 'p' );
		rec.className = 'cb-blocker__recipient';
		const recLabel = document.createElement( 'strong' );
		recLabel.textContent = ( i18n.recipient || 'Empfänger:' ) + ' ';
		rec.appendChild( recLabel );
		rec.appendChild( document.createTextNode( svc.recipient || '' ) );
		if ( svc.third_country ) {
			rec.appendChild( document.createTextNode( ' — ' ) );
			const tc = document.createElement( 'span' );
			tc.className = 'cb-blocker__third-country';
			tc.textContent = i18n.thirdCountry || '';
			rec.appendChild( tc );
		}
		inner.appendChild( rec );

		const pur = document.createElement( 'p' );
		pur.className = 'cb-blocker__purpose';
		const purLabel = document.createElement( 'strong' );
		purLabel.textContent = ( i18n.purpose || 'Zweck:' ) + ' ';
		pur.appendChild( purLabel );
		pur.appendChild( document.createTextNode( svc.purpose || '' ) );
		inner.appendChild( pur );

		if ( svc.privacy_url ) {
			const p = document.createElement( 'p' );
			const a = document.createElement( 'a' );
			a.className = 'cb-blocker__privacy-link';
			a.href = svc.privacy_url;
			a.target = '_blank';
			a.rel = 'noopener noreferrer';
			a.textContent = i18n.privacy || 'Datenschutz';
			p.appendChild( a );
			inner.appendChild( p );
		}

		const btn = document.createElement( 'button' );
		btn.type = 'button';
		btn.className = 'cb-blocker__button';
		btn.setAttribute( 'data-cb-id', svc.id );
		btn.textContent = ( i18n.load || '%s' ).replace( '%s', svc.name );
		inner.appendChild( btn );

		const label = document.createElement( 'label' );
		label.className = 'cb-blocker__remember';
		const cb = document.createElement( 'input' );
		cb.type = 'checkbox';
		cb.className = 'cb-blocker__remember-cb';
		cb.checked = true;
		label.appendChild( cb );
		label.appendChild( document.createTextNode( ' ' + ( i18n.remember || '' ) ) );
		inner.appendChild( label );

		wrap.appendChild( inner );
		return wrap;
	}

	/** Replace a freshly seen iframe with a placeholder (or let it load if consented). */
	function handleIframe( iframe ) {
		if ( iframe.dataset.cbLoaded ) return;            // one we created
		if ( iframe.closest( '.cb-blocker' ) ) return;    // inside a placeholder
		const rawSrc = iframe.getAttribute( 'src' ) || '';
		const svc = findService( rawSrc );
		if ( ! svc ) return;

		if ( hasConsent( svc.id ) ) return; // already consented → leave it

		iframe.setAttribute( 'src', 'about:blank' ); // stop the request ASAP
		const dims = {
			width:  iframe.getAttribute( 'width' )  || '',
			height: iframe.getAttribute( 'height' ) || '',
		};
		const placeholder = buildPlaceholder( svc, rawSrc, dims );
		if ( iframe.parentNode ) {
			iframe.parentNode.replaceChild( placeholder, iframe );
		}
	}

	/** Elementor video widgets store the URL in data-settings and build the
	 *  player via JS — handle them before that happens. */
	function handleElementorVideos() {
		document.querySelectorAll( '.elementor-widget-video[data-settings]' ).forEach( function ( widget ) {
			let settings;
			try {
				settings = JSON.parse( widget.dataset.settings );
			} catch ( e ) {
				return;
			}
			const raw = settings.youtube_url || settings.vimeo_url || settings.external_url || '';
			if ( ! raw ) return;

			const embed = toEmbedUrl( raw );
			const svc = findService( raw ) || findService( embed );
			if ( ! svc ) return;

			if ( hasConsent( svc.id ) ) return; // consented → let Elementor build it

			// Neutralise Elementor so it won't build the player / load the overlay.
			widget.removeAttribute( 'data-settings' );
			const container = widget.querySelector( '.elementor-widget-container' ) || widget;
			container.innerHTML = '';
			container.appendChild( buildPlaceholder( svc, embed, {} ) );
		} );
	}

	function scanExistingIframes() {
		document.querySelectorAll( 'iframe[src]' ).forEach( handleIframe );
	}

	function startObserver() {
		if ( typeof MutationObserver === 'undefined' ) return;
		const obs = new MutationObserver( function ( mutations ) {
			for ( const m of mutations ) {
				for ( const node of m.addedNodes ) {
					if ( node.nodeType !== 1 ) continue;
					if ( node.tagName === 'IFRAME' ) {
						handleIframe( node );
					} else if ( node.querySelectorAll ) {
						node.querySelectorAll( 'iframe[src]' ).forEach( handleIframe );
					}
				}
			}
		} );
		obs.observe( document.documentElement, { childList: true, subtree: true } );
	}

	/* ───────────────────────── bootstrap ─────────────────────────────── */

	function init() {
		loadPreConsented();
		attachButtons();
		handleElementorVideos();
		scanExistingIframes();
		startObserver();
	}

	if ( document.readyState === 'loading' ) {
		document.addEventListener( 'DOMContentLoaded', init );
	} else {
		init();
	}
} )();