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https://github.com/kiwix/libkiwix.git
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009eb7f905
warc2zim's service worker captures all requests and then decides what to do based on availability of the URL in the ZIM or not. To allow the external URL blocking mechanism, it needs to known whether this was enabled or not (as those in-iframe links won't be caught). It detects this by looking for the `window.block_path` variable that is set in the `block_external.js` script. As this is fragile, we're adding a comment so that a future maintainer knows that a third party tools relies on it.
74 lines
2.5 KiB
JavaScript
74 lines
2.5 KiB
JavaScript
// `block_path` variable used by openzim/warc2zim to detect whether URL blocking is enabled or not
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var block_path = "/catch/external";
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// called only on external links
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function capture_event(e, target) { target.setAttribute("href", encodeURI(block_path + "?source=" + target.href)); }
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// called on all link clicks. filters external and call capture_event
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function on_click_event(e) {
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var target = findParent("a", e.target);
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if (target !== null && "href" in target) {
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var href = target.href;
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if (window.location.pathname.indexOf(block_path) == 0) // already in catch page
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return;
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if (href.indexOf(window.location.origin) == 0)
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return;
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if (href.substr(0, 2) == "//")
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return capture_event(e, target);
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if (href.substr(0, 5) == "http:")
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return capture_event(e, target);
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if (href.substr(0, 6) == "https:")
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return capture_event(e, target);
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return;
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}
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}
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// script entrypoint (called on document ready)
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function run() { live('a', 'click', on_click_event); }
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// find first parent with tagname
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function findParent(tagname, el) {
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while (el) {
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if ((el.nodeName || el.tagName).toLowerCase() === tagname.toLowerCase()) {
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return el;
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}
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el = el.parentNode;
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}
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return null;
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}
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// matches polyfill
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this.Element && function(ElementPrototype) {
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ElementPrototype.matches = ElementPrototype.matches ||
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ElementPrototype.matchesSelector ||
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ElementPrototype.webkitMatchesSelector ||
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ElementPrototype.msMatchesSelector ||
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function(selector) {
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var node = this, nodes = (node.parentNode || node.document).querySelectorAll(selector), i = -1;
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while (nodes[++i] && nodes[i] != node);
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return !!nodes[i];
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}
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}(Element.prototype);
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// helper for enabling IE 8 event bindings
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function addEvent(el, type, handler) {
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if (el.attachEvent) el.attachEvent('on'+type, handler); else el.addEventListener(type, handler);
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}
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// live binding helper using matchesSelector
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function live(selector, event, callback, context) {
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addEvent(context || document, event, function(e) {
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var found, el = e.target || e.srcElement;
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while (el && el.matches && el !== context && !(found = el.matches(selector))) el = el.parentElement;
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if (found) callback.call(el, e);
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});
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}
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// in case the document is already rendered
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if (document.readyState!='loading') run();
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// modern browsers
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else if (document.addEventListener) document.addEventListener('DOMContentLoaded', run);
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// IE <= 8
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else document.attachEvent('onreadystatechange', function(){
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if (document.readyState=='complete') run();
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});
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