Haketilo

/**

 * Myext querying page settings with regard to wildcard records

 *

 * Copyright (C) 2021 Wojtek Kosior

 * Redistribution terms are gathered in the `copyright' file.

 */

"use strict";

(() => {

    const make_once = window.make_once;

    const get_storage = window.get_storage;

    var storage;

    var exports = {};

    async function init(fun)

    {

	storage = await get_storage();

	return fun;

    }

    // TODO: also support urls with specified ports as well as `data:' urls

    function query(url, multiple)

    {

	let proto_re = "[a-zA-Z]*:\/\/";

	let domain_re = "[^/?#]+";

	let segments_re = "/[^?#]*";

	let query_re = "\\?[^#]*";

	let url_regex = new RegExp(`\

^\

(${proto_re})\

(${domain_re})\

(${segments_re})?\

(${query_re})?\

#?.*\$\

`);

	let regex_match = url_regex.exec(url);

	if (regex_match === null) {

	    console.log("bad url format", url);

	    return multiple ? [] : [undefined, undefined];

	}

	let [_, proto, domain, segments, query] = regex_match;

	domain = domain.split(".");

	let segments_trailing_dash =

	    segments && segments[segments.length - 1] === "/";

	segments = (segments || "").split("/").filter(s => s !== "");

	segments.unshift("");

	let matched = [];

	for (let d_slice = 0; d_slice < domain.length; d_slice++) {

	    let domain_part = domain.slice(d_slice).join(".");

	    let domain_wildcards = [];

	    if (d_slice === 0)

		domain_wildcards.push("");

	    if (d_slice === 1)

		domain_wildcards.push("*.");

	    if (d_slice > 0)

		domain_wildcards.push("**.");

	    domain_wildcards.push("***.");

	    for (let domain_wildcard of domain_wildcards) {

		let domain_pattern = domain_wildcard + domain_part;

		for (let s_slice = segments.length; s_slice > 0; s_slice--) {

		    let segments_part = segments.slice(0, s_slice).join("/");

		    let segments_wildcards = [];

		    if (s_slice === segments.length) {

			if (segments_trailing_dash)

			    segments_wildcards.push("/");

			segments_wildcards.push("");

		    }

		    if (s_slice === segments.length - 1) {

			if (segments[s_slice] !== "*")

			    segments_wildcards.push("/*");

		    }

		    if (s_slice < segments.length &&

			(segments[s_slice] !== "**" ||

			 s_slice < segments.length - 1))

			segments_wildcards.push("/**");

		    if (segments[s_slice] !== "***" ||

			s_slice < segments.length)

			segments_wildcards.push("/***");

		    for (let segments_wildcard of segments_wildcards) {

			let segments_pattern =

			    segments_part + segments_wildcard;

			let pattern = proto + domain_pattern + segments_pattern;

			console.log("trying", pattern);

			let settings = storage.get(TYPE_PREFIX.PAGE, pattern);

			if (settings === undefined)

			    continue;

			if (!multiple)

			    return [pattern, settings];

			matched.push([pattern, settings]);

		    }

		}

	    }

	}

	return multiple ?  matched : [undefined, undefined];

    }

    function query_best(url)

    {

	return query(url, false);

    }

    function query_all(url)

    {

	return query(url, true);

    }

    window.get_query_best = make_once(() => init(query_best));

    window.get_query_all = make_once(() => init(query_all));

})();