forked from Fediversity/fediversity.eu
64 lines
1.9 KiB
JavaScript
Executable file
64 lines
1.9 KiB
JavaScript
Executable file
'use strict';
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const Assert = require('@hapi/hoek/lib/assert');
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const Uri = require('./uri');
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const internals = {};
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exports.regex = function (options = {}) {
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// CIDR
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Assert(options.cidr === undefined || typeof options.cidr === 'string', 'options.cidr must be a string');
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const cidr = options.cidr ? options.cidr.toLowerCase() : 'optional';
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Assert(['required', 'optional', 'forbidden'].includes(cidr), 'options.cidr must be one of required, optional, forbidden');
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// Versions
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Assert(options.version === undefined || typeof options.version === 'string' || Array.isArray(options.version), 'options.version must be a string or an array of string');
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let versions = options.version || ['ipv4', 'ipv6', 'ipvfuture'];
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if (!Array.isArray(versions)) {
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versions = [versions];
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}
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Assert(versions.length >= 1, 'options.version must have at least 1 version specified');
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for (let i = 0; i < versions.length; ++i) {
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Assert(typeof versions[i] === 'string', 'options.version must only contain strings');
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versions[i] = versions[i].toLowerCase();
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Assert(['ipv4', 'ipv6', 'ipvfuture'].includes(versions[i]), 'options.version contains unknown version ' + versions[i] + ' - must be one of ipv4, ipv6, ipvfuture');
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}
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versions = Array.from(new Set(versions));
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// Regex
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const parts = versions.map((version) => {
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// Forbidden
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if (cidr === 'forbidden') {
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return Uri.ip[version];
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}
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// Required
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const cidrpart = `\\/${version === 'ipv4' ? Uri.ip.v4Cidr : Uri.ip.v6Cidr}`;
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if (cidr === 'required') {
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return `${Uri.ip[version]}${cidrpart}`;
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}
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// Optional
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return `${Uri.ip[version]}(?:${cidrpart})?`;
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});
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const raw = `(?:${parts.join('|')})`;
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const regex = new RegExp(`^${raw}$`);
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return { cidr, versions, regex, raw };
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};
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