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import assertString from './util/assertString';
/**
11.3. Examples
The following addresses
fe80::1234 (on the 1st link of the node)
ff02::5678 (on the 5th link of the node)
ff08::9abc (on the 10th organization of the node)
would be represented as follows:
fe80::1234%1
ff02::5678%5
ff08::9abc%10
(Here we assume a natural translation from a zone index to the
<zone_id> part, where the Nth zone of any scope is translated into
"N".)
If we use interface names as <zone_id>, those addresses could also be
represented as follows:
fe80::1234%ne0
ff02::5678%pvc1.3
ff08::9abc%interface10
where the interface "ne0" belongs to the 1st link, "pvc1.3" belongs
to the 5th link, and "interface10" belongs to the 10th organization.
* * */
var ipv4Maybe = /^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/;
var ipv6Block = /^[0-9A-F]{1,4}$/i;
export default function isIP(str) {
var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
assertString(str);
version = String(version);
if (!version) {
return isIP(str, 4) || isIP(str, 6);
} else if (version === '4') {
if (!ipv4Maybe.test(str)) {
return false;
}
var parts = str.split('.').sort(function (a, b) {
return a - b;
});
return parts[3] <= 255;
} else if (version === '6') {
var addressAndZone = [str]; // ipv6 addresses could have scoped architecture
// according to https://tools.ietf.org/html/rfc4007#section-11
if (str.includes('%')) {
addressAndZone = str.split('%');
if (addressAndZone.length !== 2) {
// it must be just two parts
return false;
}
if (!addressAndZone[0].includes(':')) {
// the first part must be the address
return false;
}
if (addressAndZone[1] === '') {
// the second part must not be empty
return false;
}
}
var blocks = addressAndZone[0].split(':');
var foundOmissionBlock = false; // marker to indicate ::
// At least some OS accept the last 32 bits of an IPv6 address
// (i.e. 2 of the blocks) in IPv4 notation, and RFC 3493 says
// that '::ffff:a.b.c.d' is valid for IPv4-mapped IPv6 addresses,
// and '::a.b.c.d' is deprecated, but also valid.
var foundIPv4TransitionBlock = isIP(blocks[blocks.length - 1], 4);
var expectedNumberOfBlocks = foundIPv4TransitionBlock ? 7 : 8;
if (blocks.length > expectedNumberOfBlocks) {
return false;
} // initial or final ::
if (str === '::') {
return true;
} else if (str.substr(0, 2) === '::') {
blocks.shift();
blocks.shift();
foundOmissionBlock = true;
} else if (str.substr(str.length - 2) === '::') {
blocks.pop();
blocks.pop();
foundOmissionBlock = true;
}
for (var i = 0; i < blocks.length; ++i) {
// test for a :: which can not be at the string start/end
// since those cases have been handled above
if (blocks[i] === '' && i > 0 && i < blocks.length - 1) {
if (foundOmissionBlock) {
return false; // multiple :: in address
}
foundOmissionBlock = true;
} else if (foundIPv4TransitionBlock && i === blocks.length - 1) {// it has been checked before that the last
// block is a valid IPv4 address
} else if (!ipv6Block.test(blocks[i])) {
return false;
}
}
if (foundOmissionBlock) {
return blocks.length >= 1;
}
return blocks.length === expectedNumberOfBlocks;
}
return false;
}
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