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node_modules/@sideway/address/lib/ip.js

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