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import assertString from './util/assertString';
import isFQDN from './isFQDN';
import isIP from './isIP';
import merge from './util/merge';
/*
options for isURL method
require_protocol - if set as true isURL will return false if protocol is not present in the URL
require_valid_protocol - isURL will check if the URL's protocol is present in the protocols option
protocols - valid protocols can be modified with this option
require_host - if set as false isURL will not check if host is present in the URL
allow_protocol_relative_urls - if set as true protocol relative URLs will be allowed
*/
var default_url_options = {
protocols: ['http', 'https', 'ftp'],
require_tld: true,
require_protocol: false,
require_host: true,
require_valid_protocol: true,
allow_underscores: false,
allow_trailing_dot: false,
allow_protocol_relative_urls: false
};
var wrapped_ipv6 = /^\[([^\]]+)\](?::([0-9]+))?$/;
function isRegExp(obj) {
return Object.prototype.toString.call(obj) === '[object RegExp]';
}
function checkHost(host, matches) {
for (var i = 0; i < matches.length; i++) {
var match = matches[i];
if (host === match || isRegExp(match) && match.test(host)) {
return true;
}
}
return false;
}
export default function isURL(url, options) {
assertString(url);
if (!url || url.length >= 2083 || /[\s<>]/.test(url)) {
return false;
}
if (url.indexOf('mailto:') === 0) {
return false;
}
options = merge(options, default_url_options);
var protocol, auth, host, hostname, port, port_str, split, ipv6;
split = url.split('#');
url = split.shift();
split = url.split('?');
url = split.shift();
split = url.split('://');
if (split.length > 1) {
protocol = split.shift().toLowerCase();
if (options.require_valid_protocol && options.protocols.indexOf(protocol) === -1) {
return false;
}
} else if (options.require_protocol) {
return false;
} else if (url.substr(0, 2) === '//') {
if (!options.allow_protocol_relative_urls) {
return false;
}
split[0] = url.substr(2);
}
url = split.join('://');
if (url === '') {
return false;
}
split = url.split('/');
url = split.shift();
if (url === '' && !options.require_host) {
return true;
}
split = url.split('@');
if (split.length > 1) {
if (options.disallow_auth) {
return false;
}
auth = split.shift();
if (auth.indexOf(':') >= 0 && auth.split(':').length > 2) {
return false;
}
}
hostname = split.join('@');
port_str = null;
ipv6 = null;
var ipv6_match = hostname.match(wrapped_ipv6);
if (ipv6_match) {
host = '';
ipv6 = ipv6_match[1];
port_str = ipv6_match[2] || null;
} else {
split = hostname.split(':');
host = split.shift();
if (split.length) {
port_str = split.join(':');
}
}
if (port_str !== null) {
port = parseInt(port_str, 10);
if (!/^[0-9]+$/.test(port_str) || port <= 0 || port > 65535) {
return false;
}
}
if (!isIP(host) && !isFQDN(host, options) && (!ipv6 || !isIP(ipv6, 6))) {
return false;
}
host = host || ipv6;
if (options.host_whitelist && !checkHost(host, options.host_whitelist)) {
return false;
}
if (options.host_blacklist && checkHost(host, options.host_blacklist)) {
return false;
}
return true;
}
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