ruffle/web/extension/build/js/lv0.js

(/**
 * Pierce the extension sandbox by copying our code into window space.
 * 
 * The isolation extension content scripts get is neat, but it causes problems
 * based on what browser you use:
 * 
 * 1. On Chrome, you are explicitly banned from registering custom elements
 * 2. On Firefox, you can register custom elements but they can't expose any
 *    useful API surface, and can't even see their own methods.
 * 
 * This code exists to pierce the extension sandbox, while maintaining:
 * 
 * 1. The isolation of not interfering with the page's execution environment
 *    unintentionally.
 * 2. The ability to load extension resources such as .wasm files
 */
    async function () {
        let page_optout = document.getElementsByTagName("html")[0].dataset.ruffleOptout !== undefined;
        let obfuscated_event_prefix = "rufEvent" + Math.floor(Math.random() * 100000000000);

        if (!page_optout) {
            let ext_path = "";
            if (chrome && chrome.extension && chrome.extension.getURL) {
                ext_path = chrome.extension.getURL("dist/ruffle.js").replace("dist/ruffle.js", "");
            } else if (browser && browser.runtime && browser.runtime.getURL) {
                ext_path = browser.runtime.getURL("dist/ruffle.js").replace("dist/ruffle.js", "");
            }

            let ruffle_src_resp = await fetch(ext_path + "dist/ruffle.js");
            if (ruffle_src_resp.ok) {
                let ruffle_src = "(function () { var runtime_path = \"" +
                    ext_path + "\";\nvar obfuscated_event_prefix = \"" +
                    obfuscated_event_prefix + "\";\n" +
                    await ruffle_src_resp.text() + "}())";
                let scriptelem = document.createElement("script");
                scriptelem.appendChild(document.createTextNode(ruffle_src));
                document.head.appendChild(scriptelem);
            } else {
                console.error("Critical error loading Ruffle into page")
            }
        }
    }());