import assertString from './util/assertString';
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import merge from './util/merge';
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var default_fqdn_options = {
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require_tld: true,
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allow_underscores: false,
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allow_trailing_dot: false,
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allow_numeric_tld: false,
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allow_wildcard: false,
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ignore_max_length: false
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};
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export default function isFQDN(str, options) {
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assertString(str);
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options = merge(options, default_fqdn_options);
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/* Remove the optional trailing dot before checking validity */
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if (options.allow_trailing_dot && str[str.length - 1] === '.') {
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str = str.substring(0, str.length - 1);
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}
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/* Remove the optional wildcard before checking validity */
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if (options.allow_wildcard === true && str.indexOf('*.') === 0) {
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str = str.substring(2);
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}
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var parts = str.split('.');
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var tld = parts[parts.length - 1];
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if (options.require_tld) {
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// disallow fqdns without tld
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if (parts.length < 2) {
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return false;
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}
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if (!options.allow_numeric_tld && !/^([a-z\u00A1-\u00A8\u00AA-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]{2,}|xn[a-z0-9-]{2,})$/i.test(tld)) {
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return false;
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}
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// disallow spaces
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if (/\s/.test(tld)) {
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return false;
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}
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}
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// reject numeric TLDs
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if (!options.allow_numeric_tld && /^\d+$/.test(tld)) {
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return false;
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}
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return parts.every(function (part) {
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if (part.length > 63 && !options.ignore_max_length) {
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return false;
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}
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if (!/^[a-z_\u00a1-\uffff0-9-]+$/i.test(part)) {
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return false;
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}
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// disallow full-width chars
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if (/[\uff01-\uff5e]/.test(part)) {
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return false;
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}
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// disallow parts starting or ending with hyphen
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if (/^-|-$/.test(part)) {
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return false;
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}
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if (!options.allow_underscores && /_/.test(part)) {
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return false;
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}
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return true;
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});
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}
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