You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
856 B
48 lines
856 B
6 years ago
|
|
||
|
|
/**
|
||
|
|
* Expose `isUrl`.
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = isUrl;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* RegExps.
|
||
|
|
* A URL must match #1 and then at least one of #2/#3.
|
||
|
|
* Use two levels of REs to avoid REDOS.
|
||
|
|
*/
|
||
|
|
|
||
|
|
var protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
|
||
|
|
|
||
|
|
var localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/
|
||
|
|
var nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Loosely validate a URL `string`.
|
||
|
|
*
|
||
|
|
* @param {String} string
|
||
|
|
* @return {Boolean}
|
||
|
|
*/
|
||
|
|
|
||
|
|
function isUrl(string){
|
||
|
|
if (typeof string !== 'string') {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
var match = string.match(protocolAndDomainRE);
|
||
|
|
if (!match) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
var everythingAfterProtocol = match[1];
|
||
|
|
if (!everythingAfterProtocol) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (localhostDomainRE.test(everythingAfterProtocol) ||
|
||
|
|
nonLocalhostDomainRE.test(everythingAfterProtocol)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|