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/**
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* Hachette main content script run in all frames
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Copyright (C) 2021 jahoti
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT handle_page_actions
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* IMPORT extract_signed
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* IMPORT gen_nonce
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* IMPORT csp_rule
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* IMPORT is_privileged_url
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* IMPORT sanitize_attributes
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* IMPORT mozilla_suppress_scripts
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* IMPORT is_chrome
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* IMPORT is_mozilla
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* IMPORT start_activity_info_server
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* IMPORTS_END
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*/
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/*
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* Due to some technical limitations the chosen method of whitelisting sites
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* is to smuggle whitelist indicator in page's url as a "magical" string
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* after '#'. Right now this is only supplemental in HTTP(s) pages where
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* blocking of native scripts also happens through CSP header injection but is
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* necessary for protocols like ftp:// and file://.
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*
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* The code that actually injects the magical string into ftp:// and file://
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* urls has not yet been added to the extension.
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*/
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var nonce = undefined;
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function handle_mutation(mutations, observer)
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{
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if (document.readyState === 'complete') {
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console.log("mutation handling complete");
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observer.disconnect();
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return;
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}
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for (const mutation of mutations) {
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for (const node of mutation.addedNodes)
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block_node(node);
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}
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}
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function block_nodes_recursively(node)
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{
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block_node(node);
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for (const child of node.children)
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block_nodes_recursively(child);
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}
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function block_node(node)
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{
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/*
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* Modifying <script> element doesn't always prevent its execution in some
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* Mozilla browsers. This is Chromium-specific code.
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*/
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if (node.tagName === "SCRIPT") {
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block_script(node);
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return;
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}
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sanitize_attributes(node);
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if (node.tagName === "HEAD")
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inject_csp(node);
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}
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function block_script(node)
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{
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/*
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* Disabling scripts this way allows them to still be relatively
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* easily accessed in case they contain some useful data.
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*/
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if (node.hasAttribute("type"))
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node.setAttribute("blocked-type", node.getAttribute("type"));
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node.setAttribute("type", "application/json");
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}
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function inject_csp(head)
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{
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let meta = document.createElement("meta");
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meta.setAttribute("http-equiv", "Content-Security-Policy");
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meta.setAttribute("content", csp_rule(nonce));
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if (head.firstElementChild === null)
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head.appendChild(meta);
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else
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head.insertBefore(meta, head.firstElementChild);
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}
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if (!is_privileged_url(document.URL)) {
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const reductor =
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(ac, [_, sig, pol]) => ac[0] && ac || [extract_signed(sig, pol), sig];
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const matches = [...document.cookie.matchAll(/hachette-(\w*)=([^;]*)/g)];
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let [policy, signature] = matches.reduce(reductor, []);
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if (!policy || policy.url !== document.URL) {
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console.log("WARNING! Using default policy!!!");
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policy = {allow: false, nonce: gen_nonce()};
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}
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if (signature)
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document.cookie = `hachette-${signature}=; Max-Age=-1;`;
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handle_page_actions(policy.nonce);
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if (!policy.allow) {
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block_nodes_recursively(document.documentElement);
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if (is_chrome) {
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var observer = new MutationObserver(handle_mutation);
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observer.observe(document.documentElement, {
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attributes: true,
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childList: true,
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subtree: true
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});
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}
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if (is_mozilla)
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addEventListener('beforescriptexecute', mozilla_suppress_scripts, true);
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}
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start_activity_info_server();
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}
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