90 lines
2.9 KiB
JavaScript
90 lines
2.9 KiB
JavaScript
import RuffleObject from "./ruffle-object";
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import RuffleEmbed from "./ruffle-embed";
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import { install_plugin, FLASH_PLUGIN } from "./plugin-polyfill";
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// Live collection for object and embed tags.
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let objects = null;
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let embeds = null;
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/**
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* Polyfill native elements with Ruffle equivalents.
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*
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* This polyfill isn't fool-proof: If there's a chance site JavaScript has
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* access to a pre-polyfill element, then this will break horribly. We can
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* keep native objects out of the DOM, and thus out of JavaScript's grubby
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* little hands, but only if we load first.
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*/
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function replace_flash_instances() {
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try {
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// Create live collections to track embed tags.
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objects = objects || document.getElementsByTagName("object");
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embeds = embeds || document.getElementsByTagName("embed");
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// Replace <object> first, because <object> often wraps <embed>.
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for (let elem of Array.from(objects)) {
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if (RuffleObject.is_interdictable(elem)) {
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let ruffle_obj = RuffleObject.from_native_object_element(elem);
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elem.replaceWith(ruffle_obj);
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}
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}
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for (let elem of Array.from(embeds)) {
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if (RuffleEmbed.is_interdictable(elem)) {
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let ruffle_obj = RuffleEmbed.from_native_embed_element(elem);
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elem.replaceWith(ruffle_obj);
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}
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}
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} catch (err) {
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console.error("Serious error encountered when polyfilling native Flash elements: " + err);
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}
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}
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function polyfill_static_content() {
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replace_flash_instances();
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}
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function polyfill_dynamic_content() {
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// Listen for changes to the DOM. If nodes are added, re-check for any Flash instances.
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const observer = new MutationObserver(function (mutationsList, observer) {
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// If any nodes were added, re-run the polyfill to replace any new instances.
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let nodesAdded = mutationsList.some(mutation => mutation.addedNodes.length > 0);
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if (nodesAdded) {
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replace_flash_instances();
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}
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});
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observer.observe(document, { childList: true, subtree: true});
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}
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function falsify_plugin_detection() {
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install_plugin(FLASH_PLUGIN);
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}
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var running_polyfills = [];
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var polyfills = {
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"static-content": polyfill_static_content,
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"dynamic-content": polyfill_dynamic_content,
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"plugin-detect": falsify_plugin_detection
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};
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export function polyfill(polyfill_list) {
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for (var i = 0; i < polyfill_list.length; i += 1) {
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if (running_polyfills.indexOf(polyfill_list[i]) !== -1) {
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continue;
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}
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if (!polyfills.hasOwnProperty(polyfill_list[i])) {
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throw new Error("Requested nonexistent polyfill: " + polyfill_list[i]);
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}
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running_polyfills.push(polyfill_list[i]);
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var this_polyfill = polyfills[polyfill_list[i]];
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if (this_polyfill.dependencies !== undefined) {
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polyfill(this_polyfill.dependencies);
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}
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this_polyfill();
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}
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} |