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/**
* Implements fast shallow verification of hostnames. This does not perform a
* struct check on the content of labels (classes of Unicode characters, etc.)
* but instead check that the structure is valid (number of labels, length of
* labels, etc.).
*
* If you need stricter validation, consider using an external library.
*/
function isValidAscii(code) {
return ((code >= 97 && code <= 122) || (code >= 48 && code <= 57) || code > 127);
}
/**
* Check if a hostname string is valid. It's usually a preliminary check before
* trying to use getDomain or anything else.
*
* Beware: it does not check if the TLD exists.
*/
export default function (hostname) {
if (hostname.length > 255) {
return false;
}
if (hostname.length === 0) {
return false;
}
if (!isValidAscii(hostname.charCodeAt(0))) {
return false;
}
// Validate hostname according to RFC
var lastDotIndex = -1;
var lastCharCode = -1;
var len = hostname.length;
for (var i = 0; i < len; i += 1) {
var code = hostname.charCodeAt(i);
if (code === 46 /* '.' */) {
if (
// Check that previous label is < 63 bytes long (64 = 63 + '.')
i - lastDotIndex > 64 ||
// Check that previous character was not already a '.'
lastCharCode === 46 ||
// Check that the previous label does not end with a '-' (dash)
lastCharCode === 45 ||
// Check that the previous label does not end with a '_' (underscore)
lastCharCode === 95) {
return false;
}
lastDotIndex = i;
}
else if (!(isValidAscii(code) || code === 45 || code === 95)) {
// Check if there is a forbidden character in the label
return false;
}
lastCharCode = code;
}
return (
// Check that last label is shorter than 63 chars
len - lastDotIndex - 1 <= 63 &&
// Check that the last character is an allowed trailing label character.
// Since we already checked that the char is a valid hostname character,
// we only need to check that it's different from '-'.
lastCharCode !== 45);
}
//# sourceMappingURL=is-valid.js.map
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