/** * Hachette main content script run in all frames * * Copyright (C) 2021 Wojtek Kosior * Copyright (C) 2021 jahoti * Redistribution terms are gathered in the `copyright' file. */ /* * IMPORTS_START * IMPORT handle_page_actions * IMPORT extract_signed * IMPORT sign_data * IMPORT gen_nonce * IMPORT is_privileged_url * IMPORT is_chrome * IMPORT is_mozilla * IMPORT start_activity_info_server * IMPORT csp_rule * IMPORT is_csp_header_name * IMPORT sanitize_csp_header * IMPORTS_END */ document.content_loaded = document.readyState === "complete"; const wait_loaded = e => e.content_loaded ? Promise.resolve() : new Promise(c => e.addEventListener("DOMContentLoaded", c, {once: true})); wait_loaded(document).then(() => document.content_loaded = true); function extract_cookie_policy(cookie, min_time) { let best_result = {time: -1}; let policy = null; const extracted_signatures = []; for (const match of cookie.matchAll(/hachette-(\w*)=([^;]*)/g)) { const new_result = extract_signed(...match.slice(1, 3)); if (new_result.fail) continue; extracted_signatures.push(match[1]); if (new_result.time < Math.max(min_time, best_result.time)) continue; /* This should succeed - it's our self-produced valid JSON. */ const new_policy = JSON.parse(decodeURIComponent(new_result.data)); if (new_policy.url !== document.URL) continue; best_result = new_result; policy = new_policy; } return [policy, extracted_signatures]; } function extract_url_policy(url, min_time) { const [base_url, payload, anchor] = /^([^#]*)#?([^#]*)(#?.*)$/.exec(url).splice(1, 4); const match = /^hachette_([^_]+)_(.*)$/.exec(payload); if (!match) return [null, url]; const result = extract_signed(...match.slice(1, 3)); if (result.fail) return [null, url]; const original_url = base_url + anchor; const policy = result.time < min_time ? null : JSON.parse(decodeURIComponent(result.data)); return [policy.url === original_url ? policy : null, original_url]; } function employ_nonhttp_policy(policy) { if (!policy.allow) return; policy.nonce = gen_nonce(); const [base_url, target] = /^([^#]*)(#?.*)$/.exec(policy.url).slice(1, 3); const encoded_policy = encodeURIComponent(JSON.stringify(policy)); const payload = "hachette_" + sign_data(encoded_policy, new Date().getTime()).join("_"); const resulting_url = `${base_url}#${payload}${target}`; location.href = resulting_url; location.reload(); } /* * In the case of HTML documents: * 1. When injecting some payload we need to sanitize CSP tags before * they reach the document. * 2. Only tags inside are considered valid by the browser and * need to be considered. * 3. We want to detach from document, wait until its completes * loading, sanitize it and re-attach . * 4. We shall wait for anything to appear in or after and take that as * a sign has finished loading. * 5. Otherwise, getting the `DOMContentLoaded' event on the document shall also * be a sign that is fully loaded. */ function make_body_start_observer(DOM_element, waiting) { const observer = new MutationObserver(() => try_body_started(waiting)); observer.observe(DOM_element, {childList: true}); return observer; } function try_body_started(waiting) { const body = waiting.detached_html.querySelector("body"); if ((body && (body.firstChild || body.nextSibling)) || waiting.doc.documentElement.nextSibling) { finish_waiting(waiting); return true; } if (body && waiting.observers.length < 2) waiting.observers.push(make_body_start_observer(body, waiting)); } function finish_waiting(waiting) { if (waiting.finished) return; waiting.finished = true; waiting.observers.forEach(observer => observer.disconnect()); setTimeout(waiting.callback, 0); } function _wait_for_head(doc, detached_html, callback) { const waiting = {doc, detached_html, callback, observers: []}; if (try_body_started(waiting)) return; waiting.observers = [make_body_start_observer(detached_html, waiting)]; wait_loaded(doc).then(() => finish_waiting(waiting)); } function wait_for_head(doc, detached_html) { return new Promise(cb => _wait_for_head(doc, detached_html, cb)); } const blocked_str = "blocked"; function block_attribute(node, attr, ns=null) { const [hasa, geta, seta, rema] = ["has", "get", "set", "remove"] .map(m => (n, ...args) => typeof ns === "string" ? n[`${m}AttributeNS`](ns, ...args) : n[`${m}Attribute`](...args)); /* * Disabling attributes by prepending `-blocked' allows them to still be * relatively easily accessed in case they contain some useful data. */ const construct_name = [attr]; while (hasa(node, construct_name.join(""))) construct_name.unshift(blocked_str); while (construct_name.length > 1) { construct_name.shift(); const name = construct_name.join(""); seta(node, `${blocked_str}-${name}`, geta(node, name)); } } function sanitize_meta(meta, policy) { const value = meta.content || ""; if (!value || !is_csp_header_name(meta.httpEquiv || "", true)) return; block_attribute(meta, "content"); } /* * Used to disable