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/**
* This file is part of Haketilo.
*
* Function: Injecting policy to page by modifying HTTP headers.
*
* Copyright (C) 2021, Wojtek Kosior
* Copyright (C) 2021, jahoti
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#FROM common/misc.js IMPORT csp_header_regex
/* Re-enable the import below once nonce stuff here is ready */
#IF NEVER
#FROM common/misc.js IMPORT gen_nonce
#ENDIF
/* CSP rule that blocks scripts according to policy's needs. */
function make_csp_rule(policy)
{
let rule = "prefetch-src 'none'; script-src-attr 'none';";
const script_src = policy.nonce !== undefined ?
`'nonce-${policy.nonce}'` : "'none'";
rule += ` script-src ${script_src}; script-src-elem ${script_src};`;
return rule;
}
function inject_csp_headers(headers, policy)
{
let csp_headers;
if (policy.payload) {
headers = headers.filter(h => !csp_header_regex.test(h.name));
// TODO: make CSP rules with nonces and facilitate passing them to
// content scripts via dynamic content script registration or
// synchronous XHRs
// policy.nonce = gen_nonce();
}
if (!policy.allow && (policy.nonce || !policy.payload)) {
headers.push({
name: "content-security-policy",
value: make_csp_rule(policy)
});
}
return headers;
}
#EXPORT inject_csp_headers
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