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/**
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* This file is part of Haketilo.
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*
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* Function: Filtering request headers to remove haketilo cookies that might
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* have slipped through.
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*
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* Copyright (C) 2021 Wojtek Kosior
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* As additional permission under GNU GPL version 3 section 7, you
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* may distribute forms of that code without the copy of the GNU
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* GPL normally required by section 4, provided you include this
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* license notice and, in case of non-source distribution, a URL
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* through which recipients can access the Corresponding Source.
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* If you modify file(s) with this exception, you may extend this
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* exception to your version of the file(s), but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* As a special exception to the GPL, any HTML file which merely
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* makes function calls to this code, and for that purpose
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* includes it by reference shall be deemed a separate work for
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* copyright law purposes. If you modify this code, you may extend
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* this exception to your version of the code, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
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* license. Although I request that you do not make use this code in a
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* proprietary program, I am not going to enforce this in court.
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*/
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/*
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* IMPORTS_START
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* IMPORT extract_signed
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* IMPORTS_END
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*/
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function is_valid_haketilo_cookie(cookie)
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{
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const match = /^haketilo-(\w*)=(.*)$/.exec(cookie);
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if (!match)
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return false;
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return !extract_signed(match.slice(1, 3)).fail;
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}
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function remove_haketilo_cookies(header)
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{
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if (header.name !== "Cookie")
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return header;
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const cookies = header.value.split("; ");
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const value = cookies.filter(c => !is_valid_haketilo_cookie(c)).join("; ");
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return value ? {name: "Cookie", value} : null;
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}
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function filter_cookie_headers(headers)
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{
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return headers.map(remove_haketilo_cookies).filter(h => h);
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}
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/*
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* EXPORTS_START
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* EXPORT filter_cookie_headers
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* EXPORTS_END
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*/
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