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/**
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* Myext injecting policy to page using webRequest
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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 browser
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* IMPORT is_chrome
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* IMPORT gen_unique
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* IMPORT url_item
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* IMPORT get_query_best
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* IMPORT csp_rule
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* IMPORTS_END
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*/
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var storage;
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var query_best;
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let csp_header_names = {
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"content-security-policy" : true,
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"x-webkit-csp" : true,
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"x-content-security-policy" : true
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};
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function is_noncsp_header(header)
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{
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return !csp_header_names[header.name.toLowerCase()];
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}
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function inject(details)
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{
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let url = url_item(details.url);
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let [pattern, settings] = query_best(url);
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if (settings !== undefined && settings.allow)
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return {cancel : false};
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let nonce = gen_unique(url);
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let headers = details.responseHeaders.filter(is_noncsp_header);
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headers.push({
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name : "content-security-policy",
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value : csp_rule(nonce)
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});
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return {responseHeaders: headers};
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}
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async function start_policy_injector()
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{
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storage = await get_storage();
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query_best = await get_query_best();
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let extra_opts = ["blocking", "responseHeaders"];
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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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inject,
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{
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urls: ["<all_urls>"],
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types: ["main_frame", "sub_frame"]
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},
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extra_opts
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);
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}
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/*
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* EXPORTS_START
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* EXPORT start_policy_injector
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* EXPORTS_END
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*/
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