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/**
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* Hachette main background script
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*
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* Copyright (C) 2021 Wojtek Kosior
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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 TYPE_PREFIX
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* IMPORT get_storage
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* IMPORT light_storage
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* IMPORT start_storage_server
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* IMPORT start_page_actions_server
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* IMPORT browser
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* IMPORT is_privileged_url
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* IMPORT query_best
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* IMPORT gen_nonce
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* IMPORT inject_csp_headers
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* IMPORT apply_stream_filter
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* IMPORT filter_cookie_headers
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* IMPORT is_chrome
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* IMPORTS_END
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*/
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start_storage_server();
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start_page_actions_server();
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async function init_ext(install_details)
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{
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if (install_details.reason != "install")
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return;
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let storage = await get_storage();
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await storage.clear();
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/*
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* Below we add sample settings to the extension.
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*/
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for (let setting of // The next line is replaced with the contents of /default_settings.json by the build script
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`DEFAULT SETTINGS`
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) {
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let [key, value] = Object.entries(setting)[0];
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storage.set(key[0], key.substring(1), value);
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}
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}
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browser.runtime.onInstalled.addListener(init_ext);
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let storage;
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let policy_observable = {};
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function on_headers_received(details)
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{
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const url = details.url;
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if (is_privileged_url(details.url))
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return;
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const [pattern, settings] = query_best(storage, details.url);
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const allow = !!(settings ? settings.allow : policy_observable.value);
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const nonce = gen_nonce();
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const policy = {allow, url, nonce};
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let headers = details.responseHeaders;
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let skip = false;
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for (const header of headers) {
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if ((header.name.toLowerCase().trim() === "content-disposition" &&
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/^\s*attachment\s*(;.*)$/i.test(header.value)))
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skip = true;
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}
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headers = inject_csp_headers(headers, policy);
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skip = skip || (details.statusCode >= 300 && details.statusCode < 400);
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if (!skip) {
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/* Check for API availability. */
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if (browser.webRequest.filterResponseData)
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headers = apply_stream_filter(details, headers, policy);
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}
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return {responseHeaders: headers};
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}
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function on_before_send_headers(details)
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{
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let headers = details.requestHeaders;
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headers = filter_cookie_headers(headers);
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return {requestHeaders: headers};
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}
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const all_types = [
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"main_frame", "sub_frame", "stylesheet", "script", "image", "font",
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"object", "xmlhttprequest", "ping", "csp_report", "media", "websocket",
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"other", "main_frame", "sub_frame"
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];
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async function start_webRequest_operations()
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{
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storage = await get_storage();
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const extra_opts = ["blocking"];
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if (is_chrome)
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extra_opts.push("extraHeaders");
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browser.webRequest.onHeadersReceived.addListener(
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on_headers_received,
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{urls: ["<all_urls>"], types: ["main_frame", "sub_frame"]},
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extra_opts.concat("responseHeaders")
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);
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browser.webRequest.onBeforeSendHeaders.addListener(
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on_before_send_headers,
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{urls: ["<all_urls>"], types: all_types},
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extra_opts.concat("requestHeaders")
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);
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policy_observable = await light_storage.observe_var("default_allow");
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}
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start_webRequest_operations();
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