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/**
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* This file is part of Haketilo.
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*
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* Function: Operations on page URL patterns.
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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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const MAX = {
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URL_PATH_LEN: 12,
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URL_PATH_CHARS: 255,
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DOMAIN_LEN: 7,
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DOMAIN_CHARS: 100
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};
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const proto_regex = /^(\w+):\/\/(.*)$/;
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const user_re = "[^/?#@]+@"
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const domain_re = "[.*a-zA-Z0-9-]+";
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const path_re = "[^?#]*";
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const query_re = "\\??[^#]*";
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const http_regex = new RegExp(`^(${domain_re})(${path_re})(${query_re}).*`);
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const file_regex = new RegExp(`^(/${path_re}).*`);
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const ftp_regex = new RegExp(`^(${user_re})?(${domain_re})(${path_re}).*`);
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function match_or_throw(regex, string, error_msg)
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{
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const match = regex.exec(string);
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if (match === null)
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throw error_msg;
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return match;
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}
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function deconstruct_url(url, use_limits=true)
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{
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const max = MAX;
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if (!use_limits) {
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for (key in MAX)
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max[key] = Infinity;
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}
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const matcher = (re, str) => match_or_throw(re, str, `bad url '${url}'`)
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const proto_match = matcher(proto_regex, url);
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const deco = {proto: proto_match[1]};
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if (deco.proto === "file") {
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deco.path = matcher(file_regex, proto_match[2])[1];
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} else if (deco.proto === "ftp") {
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[deco.domain, deco.path] =
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matcher(ftp_regex, proto_match[2]).slice(2, 4);
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} else if (deco.proto === "http" || deco.proto === "https") {
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[deco.domain, deco.path, deco.query] =
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matcher(http_regex, proto_match[2]).slice(1, 4);
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deco.domain = deco.domain.toLowerCase();
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} else {
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throw `unsupported protocol in url '${url}'`;
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}
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deco.trailing_dash = deco.path[deco.path.length - 1] === "/";
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if (deco.domain) {
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if (deco.domain.length > max.DOMAIN_CHARS) {
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const idx = deco.domain.indexOf(".", deco.domain.length -
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max.DOMAIN_CHARS);
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if (idx === -1)
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deco.domain = [];
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else
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deco.domain = deco.domain.substring(idx + 1);
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deco.domain_truncated = true;
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}
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if (deco.path.length > max.URL_PATH_CHARS) {
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deco.path = deco.path.substring(0, deco.path.lastIndexOf("/"));
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deco.path_truncated = true;
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}
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}
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if (typeof deco.domain === "string") {
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deco.domain = deco.domain.split(".");
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if (deco.domain.splice(0, deco.domain.length - max.DOMAIN_LEN).length
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> 0)
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deco.domain_truncated = true;
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}
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deco.path = deco.path.split("/").filter(s => s !== "");
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if (deco.domain && deco.path.splice(max.URL_PATH_LEN).length > 0)
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deco.path_truncated = true;
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return deco;
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}
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function* each_domain_pattern(deco)
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{
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for (let slice = 0; slice < deco.domain.length - 1; slice++) {
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const domain_part = deco.domain.slice(slice).join(".");
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const domain_wildcards = [];
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if (slice === 0 && !deco.domain_truncated)
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yield domain_part;
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if (slice === 1 && !deco.domain_truncated)
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yield "*." + domain_part;
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if (slice > 1)
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yield "**." + domain_part;
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yield "***." + domain_part;
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}
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}
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function* each_path_pattern(deco)
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{
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for (let slice = deco.path.length; slice >= 0; slice--) {
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const path_part = ["", ...deco.path.slice(0, slice)].join("/");
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const path_wildcards = [];
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if (slice === deco.path.length && !deco.path_truncated) {
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if (deco.trailing_dash)
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yield path_part + "/";
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if (slice > 0 || deco.proto !== "file")
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yield path_part;
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}
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if (slice === deco.path.length - 1 && !deco.path_truncated &&
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deco.path[slice] !== "*")
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yield path_part + "/*";
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if (slice < deco.path.length - 1)
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yield path_part + "/**";
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if (slice !== deco.path.length - 1 || deco.path_truncated ||
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deco.path[slice] !== "***")
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yield path_part + "/***";
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}
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}
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/* Generate every possible pattern that matches url. */
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function* each_url_pattern(url)
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{
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const deco = deconstruct_url(url);
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if (deco === undefined) {
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console.error("bad url format", url);
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return false;
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}
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const all_domains = deco.domain ? each_domain_pattern(deco) : [""];
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for (const domain of all_domains) {
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for (const path of each_path_pattern(deco))
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yield `${deco.proto}://${domain}${path}`;
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}
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}
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/*
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* EXPORTS_START
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* EXPORT each_url_pattern
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* EXPORT deconstruct_url
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* EXPORTS_END
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*/
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