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