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URL.js
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URL.js
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/* global Symbol */
// URL Polyfill
// Draft specification: https://url.spec.whatwg.org
// Notes:
// - Primarily useful for parsing URLs and modifying query parameters
// - Should work in IE8+ and everything more modern, with es5.js polyfills
(function (global) {
'use strict';
function isSequence(o) {
if (!o) return false;
if ('Symbol' in global && 'iterator' in global.Symbol &&
typeof o[Symbol.iterator] === 'function') return true;
if (Array.isArray(o)) return true;
return false;
}
;(function() { // eslint-disable-line no-extra-semi
// Browsers may have:
// * No global URL object
// * URL with static methods only - may have a dummy constructor
// * URL with members except searchParams
// * Full URL API support
var origURL = global.URL;
var nativeURL;
try {
if (origURL) {
nativeURL = new global.URL('http://example.com');
if ('searchParams' in nativeURL) {
var url = new URL('http://example.com');
url.search = 'a=1&b=2';
if (url.href === 'http://example.com/?a=1&b=2') {
url.search = '';
if (url.href === 'http://example.com/') {
return;
}
}
}
if (!('href' in nativeURL)) {
nativeURL = undefined;
}
nativeURL = undefined;
}
// eslint-disable-next-line no-empty
} catch (_) {}
// NOTE: Doesn't do the encoding/decoding dance
function urlencoded_serialize(pairs) {
var output = '', first = true;
pairs.forEach(function (pair) {
var name = encodeURIComponent(pair.name);
var value = encodeURIComponent(pair.value);
if (!first) output += '&';
output += name + '=' + value;
first = false;
});
return output.replace(/%20/g, '+');
}
// https://url.spec.whatwg.org/#percent-decode
var cachedDecodePattern;
function percent_decode(bytes) {
// This can't simply use decodeURIComponent (part of ECMAScript) as that's limited to
// decoding to valid UTF-8 only. It throws URIError for literals that look like percent
// encoding (e.g. `x=%`, `x=%a`, and `x=a%2sf`) and for non-UTF8 binary data that was
// percent encoded and cannot be turned back into binary within a JavaScript string.
//
// The spec deals with this as follows:
// * Read input as UTF-8 encoded bytes. This needs low-level access or a modern
// Web API, like TextDecoder. Old browsers don't have that, and it'd a large
// dependency to add to this polyfill.
// * For each percentage sign followed by two hex, blindly decode the byte in binary
// form. This would require TextEncoder to not corrupt multi-byte chars.
// * Replace any bytes that would be invalid under UTF-8 with U+FFFD.
//
// Instead we:
// * Use the fact that UTF-8 is designed to make validation easy in binary.
// You don't have to decode first. There are only a handful of valid prefixes and
// ranges, per RFC 3629. <https://datatracker.ietf.org/doc/html/rfc3629#section-3>
// * Safely create multi-byte chars with decodeURIComponent, by only passing it
// valid and full characters (e.g. "%F0" separately from "%F0%9F%92%A9" throws).
// Anything else is kept as literal or replaced with U+FFFD, as per the URL spec.
if (!cachedDecodePattern) {
// In a UTF-8 multibyte sequence, non-initial bytes are always between %80 and %BF
var uContinuation = '%[89AB][0-9A-F]';
// The length of a UTF-8 sequence is specified by the first byte
//
// One-byte sequences: 0xxxxxxx
// So the byte is between %00 and %7F
var u1Bytes = '%[0-7][0-9A-F]';
// Two-byte sequences: 110xxxxx 10xxxxxx
// So the first byte is between %C0 and %DF
var u2Bytes = '%[CD][0-9A-F]' + uContinuation;
// Three-byte sequences: 1110xxxx 10xxxxxx 10xxxxxx
// So the first byte is between %E0 and %EF
var u3Bytes = '%E[0-9A-F]' + uContinuation + uContinuation;
// Four-byte sequences: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// So the first byte is between %F0 and %F7
var u4Bytes = '%F[0-7]' + uContinuation + uContinuation +uContinuation;
var anyByte = '%[0-9A-F][0-9A-F]';
// Match some consecutive percent-escaped bytes. More precisely, match
// 1-4 bytes that validly encode one character in UTF-8, or 1 byte that
// would be invalid in UTF-8 in this location.
cachedDecodePattern = new RegExp(
'(' + u4Bytes + ')|(' + u3Bytes + ')|(' + u2Bytes + ')|(' + u1Bytes + ')|(' + anyByte + ')',
'gi'
);
}
return bytes.replace(cachedDecodePattern, function (match, u4, u3, u2, u1, uBad) {
return (uBad !== undefined) ? '\uFFFD' : decodeURIComponent(match);
});
}
// NOTE: Doesn't do the encoding/decoding dance
//
// https://url.spec.whatwg.org/#concept-urlencoded-parser
function urlencoded_parse(input, isindex) {
var sequences = input.split('&');
if (isindex && sequences[0].indexOf('=') === -1)
sequences[0] = '=' + sequences[0];
var pairs = [];
sequences.forEach(function (bytes) {
if (bytes.length === 0) return;
var index = bytes.indexOf('=');
if (index !== -1) {
var name = bytes.substring(0, index);
var value = bytes.substring(index + 1);
} else {
name = bytes;
value = '';
}
name = name.replace(/\+/g, ' ');
value = value.replace(/\+/g, ' ');
pairs.push({ name: name, value: value });
});
var output = [];
pairs.forEach(function (pair) {
output.push({
name: percent_decode(pair.name),
value: percent_decode(pair.value)
});
});
return output;
}
function URLUtils(url) {
if (nativeURL)
return new origURL(url);
var anchor = document.createElement('a');
anchor.href = url;
return anchor;
}
function URLSearchParams(init) {
var $this = this;
this._list = [];
if (init === undefined || init === null) {
// no-op
} else if (init instanceof URLSearchParams) {
// In ES6 init would be a sequence, but special case for ES5.
this._list = urlencoded_parse(String(init));
} else if (typeof init === 'object' && isSequence(init)) {
Array.from(init).forEach(function(e) {
if (!isSequence(e)) throw TypeError();
var nv = Array.from(e);
if (nv.length !== 2) throw TypeError();
$this._list.push({name: String(nv[0]), value: String(nv[1])});
});
} else if (typeof init === 'object' && init) {
Object.keys(init).forEach(function(key) {
$this._list.push({name: String(key), value: String(init[key])});
});
} else {
init = String(init);
if (init.substring(0, 1) === '?')
init = init.substring(1);
this._list = urlencoded_parse(init);
}
this._url_object = null;
this._setList = function (list) { if (!updating) $this._list = list; };
var updating = false;
this._update_steps = function() {
if (updating) return;
updating = true;
if (!$this._url_object) return;
// Partial workaround for IE issue with 'about:'
if ($this._url_object.protocol === 'about:' &&
$this._url_object.pathname.indexOf('?') !== -1) {
$this._url_object.pathname = $this._url_object.pathname.split('?')[0];
}
$this._url_object.search = urlencoded_serialize($this._list);
updating = false;
};
}
Object.defineProperties(URLSearchParams.prototype, {
append: {
value: function (name, value) {
this._list.push({ name: name, value: value });
this._update_steps();
}, writable: true, enumerable: true, configurable: true
},
'delete': {
value: function (name) {
for (var i = 0; i < this._list.length;) {
if (this._list[i].name === name)
this._list.splice(i, 1);
else
++i;
}
this._update_steps();
}, writable: true, enumerable: true, configurable: true
},
get: {
value: function (name) {
for (var i = 0; i < this._list.length; ++i) {
if (this._list[i].name === name)
return this._list[i].value;
}
return null;
}, writable: true, enumerable: true, configurable: true
},
getAll: {
value: function (name) {
var result = [];
for (var i = 0; i < this._list.length; ++i) {
if (this._list[i].name === name)
result.push(this._list[i].value);
}
return result;
}, writable: true, enumerable: true, configurable: true
},
has: {
value: function (name) {
for (var i = 0; i < this._list.length; ++i) {
if (this._list[i].name === name)
return true;
}
return false;
}, writable: true, enumerable: true, configurable: true
},
set: {
value: function (name, value) {
var found = false;
for (var i = 0; i < this._list.length;) {
if (this._list[i].name === name) {
if (!found) {
this._list[i].value = value;
found = true;
++i;
} else {
this._list.splice(i, 1);
}
} else {
++i;
}
}
if (!found)
this._list.push({ name: name, value: value });
this._update_steps();
}, writable: true, enumerable: true, configurable: true
},
entries: {
value: function() { return new Iterator(this._list, 'key+value'); },
writable: true, enumerable: true, configurable: true
},
keys: {
value: function() { return new Iterator(this._list, 'key'); },
writable: true, enumerable: true, configurable: true
},
values: {
value: function() { return new Iterator(this._list, 'value'); },
writable: true, enumerable: true, configurable: true
},
forEach: {
value: function(callback) {
var thisArg = (arguments.length > 1) ? arguments[1] : undefined;
this._list.forEach(function(pair) {
callback.call(thisArg, pair.value, pair.name);
});
}, writable: true, enumerable: true, configurable: true
},
toString: {
value: function () {
return urlencoded_serialize(this._list);
}, writable: true, enumerable: false, configurable: true
},
sort: {
value: function sort() {
var entries = this.entries();
var entry = entries.next();
var keys = [];
var values = {};
while (!entry.done) {
var value = entry.value;
var key = value[0];
keys.push(key);
if (!(Object.prototype.hasOwnProperty.call(values, key))) {
values[key] = [];
}
values[key].push(value[1]);
entry = entries.next();
}
keys.sort();
for (var i = 0; i < keys.length; i++) {
this["delete"](keys[i]);
}
for (var j = 0; j < keys.length; j++) {
key = keys[j];
this.append(key, values[key].shift());
}
}
}
});
function Iterator(source, kind) {
var index = 0;
this.next = function() {
if (index >= source.length)
return {done: true, value: undefined};
var pair = source[index++];
return {done: false, value:
kind === 'key' ? pair.name :
kind === 'value' ? pair.value :
[pair.name, pair.value]};
};
}
if ('Symbol' in global && 'iterator' in global.Symbol) {
Object.defineProperty(URLSearchParams.prototype, global.Symbol.iterator, {
value: URLSearchParams.prototype.entries,
writable: true, enumerable: true, configurable: true});
Object.defineProperty(Iterator.prototype, global.Symbol.iterator, {
value: function() { return this; },
writable: true, enumerable: true, configurable: true});
}
function URL(url, base) {
if (!(this instanceof global.URL))
throw new TypeError("Failed to construct 'URL': Please use the 'new' operator.");
if (base) {
url = (function () {
if (nativeURL) return new origURL(url, base).href;
var iframe;
try {
var doc;
// Use another document/base tag/anchor for relative URL resolution, if possible
if (Object.prototype.toString.call(window.operamini) === "[object OperaMini]") {
iframe = document.createElement('iframe');
iframe.style.display = 'none';
document.documentElement.appendChild(iframe);
doc = iframe.contentWindow.document;
} else if (document.implementation && document.implementation.createHTMLDocument) {
doc = document.implementation.createHTMLDocument('');
} else if (document.implementation && document.implementation.createDocument) {
doc = document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null);
doc.documentElement.appendChild(doc.createElement('head'));
doc.documentElement.appendChild(doc.createElement('body'));
} else if (window.ActiveXObject) {
doc = new window.ActiveXObject('htmlfile');
doc.write('<head></head><body></body>');
doc.close();
}
if (!doc) throw Error('base not supported');
var baseTag = doc.createElement('base');
baseTag.href = base;
doc.getElementsByTagName('head')[0].appendChild(baseTag);
var anchor = doc.createElement('a');
anchor.href = url;
return anchor.href;
} finally {
if (iframe)
iframe.parentNode.removeChild(iframe);
}
}());
}
// An inner object implementing URLUtils (either a native URL
// object or an HTMLAnchorElement instance) is used to perform the
// URL algorithms. With full ES5 getter/setter support, return a
// regular object For IE8's limited getter/setter support, a
// different HTMLAnchorElement is returned with properties
// overridden
var instance = URLUtils(url || '');
// Detect for ES5 getter/setter support
// (an Object.defineProperties polyfill that doesn't support getters/setters may throw)
var ES5_GET_SET = (function() {
if (!('defineProperties' in Object)) return false;
try {
var obj = {};
Object.defineProperties(obj, { prop: { get: function () { return true; } } });
return obj.prop;
} catch (_) {
return false;
}
}());
var self = ES5_GET_SET ? this : document.createElement('a');
var query_object = new URLSearchParams(
instance.search ? instance.search.substring(1) : null);
query_object._url_object = self;
Object.defineProperties(self, {
href: {
get: function () { return instance.href; },
set: function (v) { instance.href = v; tidy_instance(); update_steps(); },
enumerable: true, configurable: true
},
origin: {
get: function () {
if (this.protocol.toLowerCase() === "data:") {
return null
}
if ('origin' in instance) return instance.origin;
return this.protocol + '//' + this.host;
},
enumerable: true, configurable: true
},
protocol: {
get: function () { return instance.protocol; },
set: function (v) { instance.protocol = v; },
enumerable: true, configurable: true
},
username: {
get: function () { return instance.username; },
set: function (v) { instance.username = v; },
enumerable: true, configurable: true
},
password: {
get: function () { return instance.password; },
set: function (v) { instance.password = v; },
enumerable: true, configurable: true
},
host: {
get: function () {
// IE returns default port in |host|
var re = {'http:': /:80$/, 'https:': /:443$/, 'ftp:': /:21$/}[instance.protocol];
return re ? instance.host.replace(re, '') : instance.host;
},
set: function (v) { instance.host = v; },
enumerable: true, configurable: true
},
hostname: {
get: function () { return instance.hostname; },
set: function (v) { instance.hostname = v; },
enumerable: true, configurable: true
},
port: {
get: function () { return instance.port; },
set: function (v) { instance.port = v; },
enumerable: true, configurable: true
},
pathname: {
get: function () {
// IE does not include leading '/' in |pathname|
if (instance.pathname.charAt(0) !== '/') return '/' + instance.pathname;
return instance.pathname;
},
set: function (v) { instance.pathname = v; },
enumerable: true, configurable: true
},
search: {
get: function () { return instance.search; },
set: function (v) {
if (instance.search === v) return;
instance.search = v; tidy_instance(); update_steps();
},
enumerable: true, configurable: true
},
searchParams: {
get: function () { return query_object; },
enumerable: true, configurable: true
},
hash: {
get: function () { return instance.hash; },
set: function (v) { instance.hash = v; tidy_instance(); },
enumerable: true, configurable: true
},
toString: {
value: function() { return instance.toString(); },
enumerable: false, configurable: true
},
valueOf: {
value: function() { return instance.valueOf(); },
enumerable: false, configurable: true
}
});
function tidy_instance() {
var href = instance.href.replace(/#$|\?$|\?(?=#)/g, '');
if (instance.href !== href)
instance.href = href;
}
function update_steps() {
query_object._setList(instance.search ? urlencoded_parse(instance.search.substring(1)) : []);
query_object._update_steps();
}
return self;
}
if (origURL) {
for (var i in origURL) {
if (Object.prototype.hasOwnProperty.call(origURL, i) && typeof origURL[i] === 'function')
URL[i] = origURL[i];
}
}
global.URL = URL;
global.URLSearchParams = URLSearchParams;
})();
// Patch native URLSearchParams constructor to handle sequences/records
// if necessary.
(function() {
if (new global.URLSearchParams([['a', 1]]).get('a') === '1' &&
new global.URLSearchParams({a: 1}).get('a') === '1')
return;
var orig = global.URLSearchParams;
global.URLSearchParams = function(init) {
if (init && typeof init === 'object' && isSequence(init)) {
var o = new orig();
Array.from(init).forEach(function (e) {
if (!isSequence(e)) throw TypeError();
var nv = Array.from(e);
if (nv.length !== 2) throw TypeError();
o.append(nv[0], nv[1]);
});
return o;
} else if (init && typeof init === 'object') {
o = new orig();
Object.keys(init).forEach(function(key) {
o.set(key, init[key]);
});
return o;
} else {
return new orig(init);
}
};
})();
}(self));

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