Haketilo

/**

 * Myext querying page settings with regard to wildcard records

 *

 * Copyright (C) 2021 Wojtek Kosior

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

 */

/*

 * IMPORTS_START

 * IMPORT make_once

 * IMPORT get_storage

 * IMPORT TYPE_PREFIX

 * IMPORTS_END

 */

var storage;

var exports = {};

async function init(fun)

{

    storage = await get_storage();

    return fun;

}

// TODO: also support urls with specified ports

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);

}

const get_query_best = make_once(() => init(query_best));

const get_query_all = make_once(() => init(query_all));

/*

 * EXPORTS_START

 * EXPORT get_query_best

 * EXPORT get_query_all

 * EXPORTS_END

 */