// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

const {

Int8Array,

ObjectCreate,

ObjectKeys,

SafeSet,

StringPrototypeCharCodeAt,

decodeURIComponent,

} = primordials;

const { toASCII } = require('internal/idna');

const { encodeStr, hexTable } = require('internal/querystring');

const querystring = require('querystring');

const {

ERR_INVALID_ARG_TYPE,

ERR_INVALID_URL,

} = require('internal/errors').codes;

const { validateString } = require('internal/validators');

// This ensures setURLConstructor() is called before the native

// URL::ToObject() method is used.

const { spliceOne } = require('internal/util');

// WHATWG URL implementation provided by internal/url

const {

URL,

URLSearchParams,

domainToASCII,

domainToUnicode,

fileURLToPath,

formatSymbol,

pathToFileURL,

urlToHttpOptions,

} = require('internal/url');

// Original url.parse() API

function Url() {

this.protocol = null;

this.slashes = null;

this.auth = null;

this.host = null;

this.port = null;

this.hostname = null;

this.hash = null;

this.search = null;

this.query = null;

this.pathname = null;

this.path = null;

this.href = null;

}

// Reference: RFC 3986, RFC 1808, RFC 2396

// define these here so at least they only have to be

// compiled once on the first module load.

const protocolPattern = /^[a-z0-9.+-]+:/i;

const portPattern = /:[0-9]*$/;

const hostPattern = /^\/\/[^@/]+@[^@/]+/;

// Special case for a simple path URL

const simplePathPattern = /^(\/\/?(?!\/)[^?\s]*)(\?[^\s]*)?$/;

const hostnameMaxLen = 255;

// Protocols that can allow "unsafe" and "unwise" chars.

const unsafeProtocol = new SafeSet([

'javascript',

'javascript:',

]);

// Protocols that never have a hostname.

const hostlessProtocol = new SafeSet([

'javascript',

'javascript:',

]);

// Protocols that always contain a // bit.

const slashedProtocol = new SafeSet([

'http',

'http:',

'https',

'https:',

'ftp',

'ftp:',

'gopher',

'gopher:',

'file',

'file:',

'ws',

'ws:',

'wss',

'wss:',

]);

const {

CHAR_SPACE,

CHAR_TAB,

CHAR_CARRIAGE_RETURN,

CHAR_LINE_FEED,

CHAR_NO_BREAK_SPACE,

CHAR_ZERO_WIDTH_NOBREAK_SPACE,

CHAR_HASH,

CHAR_FORWARD_SLASH,

CHAR_LEFT_SQUARE_BRACKET,

CHAR_RIGHT_SQUARE_BRACKET,

CHAR_LEFT_ANGLE_BRACKET,

CHAR_RIGHT_ANGLE_BRACKET,

CHAR_LEFT_CURLY_BRACKET,

CHAR_RIGHT_CURLY_BRACKET,

CHAR_QUESTION_MARK,

CHAR_LOWERCASE_A,

CHAR_LOWERCASE_Z,

CHAR_UPPERCASE_A,

CHAR_UPPERCASE_Z,

CHAR_DOT,

CHAR_0,

CHAR_9,

CHAR_HYPHEN_MINUS,

CHAR_PLUS,

CHAR_UNDERSCORE,

CHAR_DOUBLE_QUOTE,

CHAR_SINGLE_QUOTE,

CHAR_PERCENT,

CHAR_SEMICOLON,

CHAR_BACKWARD_SLASH,

CHAR_CIRCUMFLEX_ACCENT,

CHAR_GRAVE_ACCENT,

CHAR_VERTICAL_LINE,

CHAR_AT,

} = require('internal/constants');

function urlParse(url, parseQueryString, slashesDenoteHost) {

if (url instanceof Url) return url;

const urlObject = new Url();

urlObject.parse(url, parseQueryString, slashesDenoteHost);

return urlObject;

}

function isIpv6Hostname(hostname) {

return (

StringPrototypeCharCodeAt(hostname, 0) === CHAR_LEFT_SQUARE_BRACKET &&

StringPrototypeCharCodeAt(hostname, hostname.length - 1) ===

CHAR_RIGHT_SQUARE_BRACKET

);

}

// This prevents some common spoofing bugs due to our use of IDNA toASCII. For

// compatibility, the set of characters we use here is the *intersection* of

// "forbidden host code point" in the WHATWG URL Standard [1] and the

// characters in the host parsing loop in Url.prototype.parse, with the

// following additions:

//

// - ':' since this could cause a "protocol spoofing" bug

// - '@' since this could cause parts of the hostname to be confused with auth

// - '[' and ']' since this could cause a non-IPv6 hostname to be interpreted

// as IPv6 by isIpv6Hostname above

//

// [1]: https://url.spec.whatwg.org/#forbidden-host-code-point

const forbiddenHostChars = /[\t\n\r #%/:<>?@[\\\]^|]/;

Url.prototype.parse = function parse(url, parseQueryString, slashesDenoteHost) {

validateString(url, 'url');

// Copy chrome, IE, opera backslash-handling behavior.

// Back slashes before the query string get converted to forward slashes

// See: https://code.google.com/p/chromium/issues/detail?id=25916

let hasHash = false;

let hasAt = false;

let start = -1;

let end = -1;

let rest = '';

let lastPos = 0;

for (let i = 0, inWs = false, split = false; i < url.length; ++i) {

const code = url.charCodeAt(i);

// Find first and last non-whitespace characters for trimming

const isWs = code < 33 ||

code === CHAR_NO_BREAK_SPACE ||

code === CHAR_ZERO_WIDTH_NOBREAK_SPACE;

if (start === -1) {

if (isWs)

continue;

lastPos = start = i;

} else if (inWs) {

if (!isWs) {

end = -1;

inWs = false;

}

} else if (isWs) {

end = i;

inWs = true;

}

// Only convert backslashes while we haven't seen a split character

if (!split) {

switch (code) {

case CHAR_AT:

hasAt = true;

break;

case CHAR_HASH:

hasHash = true;

// Fall through

case CHAR_QUESTION_MARK:

split = true;

break;

case CHAR_BACKWARD_SLASH:

if (i - lastPos > 0)

rest += url.slice(lastPos, i);

rest += '/';

lastPos = i + 1;

break;

}

} else if (!hasHash && code === CHAR_HASH) {

hasHash = true;

}

}

// Check if string was non-empty (including strings with only whitespace)

if (start !== -1) {

if (lastPos === start) {

// We didn't convert any backslashes

if (end === -1) {

if (start === 0)

rest = url;

else

rest = url.slice(start);

} else {

rest = url.slice(start, end);

}

} else if (end === -1 && lastPos < url.length) {

// We converted some backslashes and have only part of the entire string

rest += url.slice(lastPos);

} else if (end !== -1 && lastPos < end) {

// We converted some backslashes and have only part of the entire string

rest += url.slice(lastPos, end);

}

}

if (!slashesDenoteHost && !hasHash && !hasAt) {

// Try fast path regexp

const simplePath = simplePathPattern.exec(rest);

if (simplePath) {

this.path = rest;

this.href = rest;

this.pathname = simplePath[1];

if (simplePath[2]) {

this.search = simplePath[2];

if (parseQueryString) {

this.query = querystring.parse(this.search.slice(1));

} else {

this.query = this.search.slice(1);

}

} else if (parseQueryString) {

this.search = null;

this.query = ObjectCreate(null);

}

return this;

}

}

let proto = protocolPattern.exec(rest);

let lowerProto;

if (proto) {

proto = proto[0];

lowerProto = proto.toLowerCase();

this.protocol = lowerProto;

rest = rest.slice(proto.length);

}

// Figure out if it's got a host

// user@server is *always* interpreted as a hostname, and url

// resolution will treat //foo/bar as host=foo,path=bar because that's

// how the browser resolves relative URLs.

let slashes;

if (slashesDenoteHost || proto || hostPattern.test(rest)) {

slashes = rest.charCodeAt(0) === CHAR_FORWARD_SLASH &&

rest.charCodeAt(1) === CHAR_FORWARD_SLASH;

if (slashes && !(proto && hostlessProtocol.has(lowerProto))) {

rest = rest.slice(2);

this.slashes = true;

}

}

if (!hostlessProtocol.has(lowerProto) &&

(slashes || (proto && !slashedProtocol.has(proto)))) {

// there's a hostname.

// the first instance of /, ?, ;, or # ends the host.

//

// If there is an @ in the hostname, then non-host chars *are* allowed

// to the left of the last @ sign, unless some host-ending character

// comes *before* the @-sign.

// URLs are obnoxious.

//

// ex:

// http://a@b@c/ => user:a@b host:c

// http://a@b?@c => user:a host:b path:/?@c

let hostEnd = -1;

let atSign = -1;

let nonHost = -1;

for (let i = 0; i < rest.length; ++i) {

switch (rest.charCodeAt(i)) {

case CHAR_TAB:

case CHAR_LINE_FEED:

case CHAR_CARRIAGE_RETURN:

case CHAR_SPACE:

case CHAR_DOUBLE_QUOTE:

case CHAR_PERCENT:

case CHAR_SINGLE_QUOTE:

case CHAR_SEMICOLON:

case CHAR_LEFT_ANGLE_BRACKET:

case CHAR_RIGHT_ANGLE_BRACKET:

case CHAR_BACKWARD_SLASH:

case CHAR_CIRCUMFLEX_ACCENT:

case CHAR_GRAVE_ACCENT:

case CHAR_LEFT_CURLY_BRACKET:

case CHAR_VERTICAL_LINE:

case CHAR_RIGHT_CURLY_BRACKET:

// Characters that are never ever allowed in a hostname from RFC 2396

if (nonHost === -1)

nonHost = i;

break;

case CHAR_HASH:

case CHAR_FORWARD_SLASH:

case CHAR_QUESTION_MARK:

// Find the first instance of any host-ending characters

if (nonHost === -1)

nonHost = i;

hostEnd = i;

break;

case CHAR_AT:

// At this point, either we have an explicit point where the

// auth portion cannot go past, or the last @ char is the decider.

atSign = i;

nonHost = -1;

break;

}

if (hostEnd !== -1)

break;

}

start = 0;

if (atSign !== -1) {

this.auth = decodeURIComponent(rest.slice(0, atSign));

start = atSign + 1;

}

if (nonHost === -1) {

this.host = rest.slice(start);

rest = '';

} else {

this.host = rest.slice(start, nonHost);

rest = rest.slice(nonHost);

}

// pull out port.

this.parseHost();

// We've indicated that there is a hostname,

// so even if it's empty, it has to be present.

if (typeof this.hostname !== 'string')

this.hostname = '';

const hostname = this.hostname;

// If hostname begins with [ and ends with ]

// assume that it's an IPv6 address.

const ipv6Hostname = isIpv6Hostname(hostname);

// validate a little.

if (!ipv6Hostname) {

rest = getHostname(this, rest, hostname);

}

if (this.hostname.length > hostnameMaxLen) {

this.hostname = '';

} else {

// Hostnames are always lower case.

this.hostname = this.hostname.toLowerCase();

}

if (!ipv6Hostname && this.hostname !== '') {

// IDNA Support: Returns a punycoded representation of "domain".

// It only converts parts of the domain name that

// have non-ASCII characters, i.e. it doesn't matter if

// you call it with a domain that already is ASCII-only.

// Use lenient mode (`true`) to try to support even non-compliant

// URLs.

this.hostname = toASCII(this.hostname, true);

// Prevent two potential routes of hostname spoofing.

// 1. If this.hostname is empty, it must have become empty due to toASCII

// since we checked this.hostname above.

// 2. If any of forbiddenHostChars appears in this.hostname, it must have

// also gotten in due to toASCII. This is since getHostname would have

// filtered them out otherwise.

// Rather than trying to correct this by moving the non-host part into

// the pathname as we've done in getHostname, throw an exception to

// convey the severity of this issue.

if (this.hostname === '' || forbiddenHostChars.test(this.hostname)) {

throw new ERR_INVALID_URL(url);

}

}

const p = this.port ? ':' + this.port : '';

const h = this.hostname || '';

this.host = h + p;

// strip [ and ] from the hostname

// the host field still retains them, though

if (ipv6Hostname) {

this.hostname = this.hostname.slice(1, -1);

if (rest[0] !== '/') {

rest = '/' + rest;

}

}

}

// Now rest is set to the post-host stuff.

// Chop off any delim chars.

if (!unsafeProtocol.has(lowerProto)) {

// First, make 100% sure that any "autoEscape" chars get

// escaped, even if encodeURIComponent doesn't think they

// need to be.

rest = autoEscapeStr(rest);

}

let questionIdx = -1;

let hashIdx = -1;

for (let i = 0; i < rest.length; ++i) {

const code = rest.charCodeAt(i);

if (code === CHAR_HASH) {

this.hash = rest.slice(i);

hashIdx = i;

break;

} else if (code === CHAR_QUESTION_MARK && questionIdx === -1) {

questionIdx = i;

}

}

if (questionIdx !== -1) {

if (hashIdx === -1) {

this.search = rest.slice(questionIdx);

this.query = rest.slice(questionIdx + 1);

} else {

this.search = rest.slice(questionIdx, hashIdx);

this.query = rest.slice(questionIdx + 1, hashIdx);

}

if (parseQueryString) {

this.query = querystring.parse(this.query);

}

} else if (parseQueryString) {

// No query string, but parseQueryString still requested

this.search = null;

this.query = ObjectCreate(null);

}

const useQuestionIdx =

questionIdx !== -1 && (hashIdx === -1 || questionIdx < hashIdx);

const firstIdx = useQuestionIdx ? questionIdx : hashIdx;

if (firstIdx === -1) {

if (rest.length > 0)

this.pathname = rest;

} else if (firstIdx > 0) {

this.pathname = rest.slice(0, firstIdx);

}

if (slashedProtocol.has(lowerProto) &&

this.hostname && !this.pathname) {

this.pathname = '/';

}

// To support http.request

if (this.pathname || this.search) {

const p = this.pathname || '';

const s = this.search || '';

this.path = p + s;

}

// Finally, reconstruct the href based on what has been validated.

this.href = this.format();

return this;

};

function getHostname(self, rest, hostname) {

for (let i = 0; i < hostname.length; ++i) {

const code = hostname.charCodeAt(i);

const isValid = (code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z) ||

code === CHAR_DOT ||

(code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z) ||

(code >= CHAR_0 && code <= CHAR_9) ||

code === CHAR_HYPHEN_MINUS ||

code === CHAR_PLUS ||

code === CHAR_UNDERSCORE ||

code > 127;

// Invalid host character

if (!isValid) {

self.hostname = hostname.slice(0, i);

return `/${hostname.slice(i)}${rest}`;

}

}

return rest;

}

// Escaped characters. Use empty strings to fill up unused entries.

// Using Array is faster than Object/Map

const escapedCodes = [

/* 0 - 9 */ '', '', '', '', '', '', '', '', '', '%09',

/* 10 - 19 */ '%0A', '', '', '%0D', '', '', '', '', '', '',

/* 20 - 29 */ '', '', '', '', '', '', '', '', '', '',

/* 30 - 39 */ '', '', '%20', '', '%22', '', '', '', '', '%27',

/* 40 - 49 */ '', '', '', '', '', '', '', '', '', '',

/* 50 - 59 */ '', '', '', '', '', '', '', '', '', '',

/* 60 - 69 */ '%3C', '', '%3E', '', '', '', '', '', '', '',

/* 70 - 79 */ '', '', '', '', '', '', '', '', '', '',

/* 80 - 89 */ '', '', '', '', '', '', '', '', '', '',

/* 90 - 99 */ '', '', '%5C', '', '%5E', '', '%60', '', '', '',

/* 100 - 109 */ '', '', '', '', '', '', '', '', '', '',

/* 110 - 119 */ '', '', '', '', '', '', '', '', '', '',

/* 120 - 125 */ '', '', '', '%7B', '%7C', '%7D',

];

// Automatically escape all delimiters and unwise characters from RFC 2396.

// Also escape single quotes in case of an XSS attack.

// Return the escaped string.

function autoEscapeStr(rest) {

let escaped = '';

let lastEscapedPos = 0;

for (let i = 0; i < rest.length; ++i) {

// `escaped` contains substring up to the last escaped character.

const escapedChar = escapedCodes[rest.charCodeAt(i)];

if (escapedChar) {

// Concat if there are ordinary characters in the middle.

if (i > lastEscapedPos)

escaped += rest.slice(lastEscapedPos, i);

escaped += escapedChar;

lastEscapedPos = i + 1;

}

}

if (lastEscapedPos === 0) // Nothing has been escaped.

return rest;

// There are ordinary characters at the end.

if (lastEscapedPos < rest.length)

escaped += rest.slice(lastEscapedPos);

return escaped;

}

// Format a parsed object into a url string

function urlFormat(urlObject, options) {

// Ensure it's an object, and not a string url.

// If it's an object, this is a no-op.

// this way, you can call urlParse() on strings

// to clean up potentially wonky urls.

if (typeof urlObject === 'string') {

urlObject = urlParse(urlObject);

} else if (typeof urlObject !== 'object' || urlObject === null) {

throw new ERR_INVALID_ARG_TYPE('urlObject',

['Object', 'string'], urlObject);

} else if (!(urlObject instanceof Url)) {

const format = urlObject[formatSymbol];

return format ?

format.call(urlObject, options) :

Url.prototype.format.call(urlObject);

}

return urlObject.format();

}

// These characters do not need escaping:

// ! - . _ ~

// ' ( ) * :

// digits

// alpha (uppercase)

// alpha (lowercase)

const noEscapeAuth = new Int8Array([

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00 - 0x0F

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x10 - 0x1F

0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, // 0x20 - 0x2F

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, // 0x30 - 0x3F

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x40 - 0x4F

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, // 0x50 - 0x5F

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6F

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, // 0x70 - 0x7F

]);

Url.prototype.format = function format() {

let auth = this.auth || '';

if (auth) {

auth = encodeStr(auth, noEscapeAuth, hexTable);

auth += '@';

}

let protocol = this.protocol || '';

let pathname = this.pathname || '';

let hash = this.hash || '';

let host = '';

let query = '';

if (this.host) {

host = auth + this.host;

} else if (this.hostname) {

host = auth + (

this.hostname.includes(':') && !isIpv6Hostname(this.hostname) ?

'[' + this.hostname + ']' :

this.hostname

);

if (this.port) {

host += ':' + this.port;

}

}

if (this.query !== null && typeof this.query === 'object') {

query = querystring.stringify(this.query);

}

let search = this.search || (query && ('?' + query)) || '';

if (protocol && protocol.charCodeAt(protocol.length - 1) !== 58/* : */)

protocol += ':';

let newPathname = '';

let lastPos = 0;

for (let i = 0; i < pathname.length; ++i) {

switch (pathname.charCodeAt(i)) {

case CHAR_HASH:

if (i - lastPos > 0)

newPathname += pathname.slice(lastPos, i);

newPathname += '%23';

lastPos = i + 1;

break;

case CHAR_QUESTION_MARK:

if (i - lastPos > 0)

newPathname += pathname.slice(lastPos, i);

newPathname += '%3F';

lastPos = i + 1;

break;

}

}

if (lastPos > 0) {

if (lastPos !== pathname.length)

pathname = newPathname + pathname.slice(lastPos);

else

pathname = newPathname;

}

// Only the slashedProtocols get the //. Not mailto:, xmpp:, etc.

// unless they had them to begin with.

if (this.slashes || slashedProtocol.has(protocol)) {

if (this.slashes || host) {

if (pathname && pathname.charCodeAt(0) !== CHAR_FORWARD_SLASH)

pathname = '/' + pathname;

host = '//' + host;

} else if (protocol.length >= 4 &&

protocol.charCodeAt(0) === 102/* f */ &&

protocol.charCodeAt(1) === 105/* i */ &&

protocol.charCodeAt(2) === 108/* l */ &&

protocol.charCodeAt(3) === 101/* e */) {

host = '//';

}

}

search = search.replace(/#/g, '%23');

if (hash && hash.charCodeAt(0) !== CHAR_HASH)

hash = '#' + hash;

if (search && search.charCodeAt(0) !== CHAR_QUESTION_MARK)

search = '?' + search;

return protocol + host + pathname + search + hash;

};

function urlResolve(source, relative) {

return urlParse(source, false, true).resolve(relative);

}

Url.prototype.resolve = function resolve(relative) {

return this.resolveObject(urlParse(relative, false, true)).format();

};

function urlResolveObject(source, relative) {

if (!source) return relative;

return urlParse(source, false, true).resolveObject(relative);

}

Url.prototype.resolveObject = function resolveObject(relative) {

if (typeof relative === 'string') {

const rel = new Url();

rel.parse(relative, false, true);

relative = rel;

}

const result = new Url();

const tkeys = ObjectKeys(this);

for (let tk = 0; tk < tkeys.length; tk++) {

const tkey = tkeys[tk];

result[tkey] = this[tkey];

}

// Hash is always overridden, no matter what.

// even href="" will remove it.

result.hash = relative.hash;

// If the relative url is empty, then there's nothing left to do here.

if (relative.href === '') {

result.href = result.format();

return result;

}

// Hrefs like //foo/bar always cut to the protocol.

if (relative.slashes && !relative.protocol) {

// Take everything except the protocol from relative

const rkeys = ObjectKeys(relative);

for (let rk = 0; rk < rkeys.length; rk++) {

const rkey = rkeys[rk];

if (rkey !== 'protocol')

result[rkey] = relative[rkey];

}

// urlParse appends trailing / to urls like http://www.example.com

if (slashedProtocol.has(result.protocol) &&

result.hostname && !result.pathname) {

result.path = result.pathname = '/';

}

result.href = result.format();

return result;

}

if (relative.protocol && relative.protocol !== result.protocol) {

// If it's a known url protocol, then changing

// the protocol does weird things

// first, if it's not file:, then we MUST have a host,

// and if there was a path

// to begin with, then we MUST have a path.

// if it is file:, then the host is dropped,

// because that's known to be hostless.

// anything else is assumed to be absolute.

if (!slashedProtocol.has(relative.protocol)) {

const keys = ObjectKeys(relative);

for (let v = 0; v < keys.length; v++) {

const k = keys[v];

result[k] = relative[k];

}

result.href = result.format();

return result;

}

result.protocol = relative.protocol;

if (!relative.host &&

!/^file:?$/.test(relative.protocol) &&

!hostlessProtocol.has(relative.protocol)) {

const relPath = (relative.pathname || '').split('/');

while (relPath.length && !(relative.host = relPath.shift()));

if (!relative.host) relative.host = '';

if (!relative.hostname) relative.hostname = '';

if (relPath[0] !== '') relPath.unshift('');

if (relPath.length < 2) relPath.unshift('');

result.pathname = relPath.join('/');

} else {

result.pathname = relative.pathname;

}

result.search = relative.search;

result.query = relative.query;

result.host = relative.host || '';

result.auth = relative.auth;

result.hostname = relative.hostname || relative.host;

result.port = relative.port;

// To support http.request

if (result.pathname || result.search) {

const p = result.pathname || '';

const s = result.search || '';

result.path = p + s;

}

result.slashes = result.slashes || relative.slashes;

result.href = result.format();

return result;

}

const isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/');

const isRelAbs = (

relative.host || (relative.pathname && relative.pathname.charAt(0) === '/')

);

let mustEndAbs = (isRelAbs || isSourceAbs ||

(result.host && relative.pathname));

const removeAllDots = mustEndAbs;

let srcPath = (result.pathname && result.pathname.split('/')) || [];

const relPath = (relative.pathname && relative.pathname.split('/')) || [];

const noLeadingSlashes = result.protocol &&

!slashedProtocol.has(result.protocol);

// If the url is a non-slashed url, then relative

// links like ../.. should be able

// to crawl up to the hostname, as well. This is strange.

// result.protocol has already been set by now.

// Later on, put the first path part into the host field.

if (noLeadingSlashes) {

result.hostname = '';

result.port = null;

if (result.host) {

if (srcPath[0] === '') srcPath[0] = result.host;

else srcPath.unshift(result.host);

}

result.host = '';

if (relative.protocol) {

relative.hostname = null;

relative.port = null;

result.auth = null;

if (relative.host) {

if (relPath[0] === '') relPath[0] = relative.host;

else relPath.unshift(relative.host);

}

relative.host = null;

}

mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');

}

if (isRelAbs) {

// it's absolute.

if (relative.host || relative.host === '') {

if (result.host !== relative.host) result.auth = null;

result.host = relative.host;

result.port = relative.port;

}

if (relative.hostname || relative.hostname === '') {

if (result.hostname !== relative.hostname) result.auth = null;

result.hostname = relative.hostname;

}

result.search = relative.search;

result.query = relative.query;

srcPath = relPath;

// Fall through to the dot-handling below.

} else if (relPath.length) {

// it's relative

// throw away the existing file, and take the new path instead.

if (!srcPath) srcPath = [];

srcPath.pop();

srcPath = srcPath.concat(relPath);

result.search = relative.search;

result.query = relative.query;

} else if (relative.search !== null && relative.search !== undefined) {

// Just pull out the search.

// like href='?foo'.

// Put this after the other two cases because it simplifies the booleans

if (noLeadingSlashes) {

result.hostname = result.host = srcPath.shift();

// Occasionally the auth can get stuck only in host.

// This especially happens in cases like

// url.resolveObject('mailto:local1@domain1', 'local2@domain2')

const authInHost =

result.host && result.host.indexOf('@') > 0 && result.host.split('@');

if (authInHost) {

result.auth = authInHost.shift();

result.host = result.hostname = authInHost.shift();

}

}

result.search = relative.search;

result.query = relative.query;

// To support http.request

if (result.pathname !== null || result.search !== null) {

result.path = (result.pathname ? result.pathname : '') +

(result.search ? result.search : '');

}

result.href = result.format();

return result;

}

if (!srcPath.length) {

// No path at all. All other things were already handled above.

result.pathname = null;

// To support http.request

if (result.search) {

result.path = '/' + result.search;

} else {

result.path = null;

}

result.href = result.format();

return result;

}

// If a url ENDs in . or .., then it must get a trailing slash.

// however, if it ends in anything else non-slashy,

// then it must NOT get a trailing slash.

let last = srcPath.slice(-1)[0];

const hasTrailingSlash = (

((result.host || relative.host || srcPath.length > 1) &&

(last === '.' || last === '..')) || last === '');

// Strip single dots, resolve double dots to parent dir

// if the path tries to go above the root, `up` ends up > 0

let up = 0;

for (let i = srcPath.length - 1; i >= 0; i--) {

last = srcPath[i];

if (last === '.') {

spliceOne(srcPath, i);

} else if (last === '..') {

spliceOne(srcPath, i);

up++;

} else if (up) {

spliceOne(srcPath, i);

up--;

}

}

// If the path is allowed to go above the root, restore leading ..s

if (!mustEndAbs && !removeAllDots) {

while (up--) {

srcPath.unshift('..');

}

}

if (mustEndAbs && srcPath[0] !== '' &&

(!srcPath[0] || srcPath[0].charAt(0) !== '/')) {

srcPath.unshift('');

}

if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {

srcPath.push('');

}

const isAbsolute = srcPath[0] === '' ||

(srcPath[0] && srcPath[0].charAt(0) === '/');

// put the host back

if (noLeadingSlashes) {

result.hostname =

result.host = isAbsolute ? '' : srcPath.length ? srcPath.shift() : '';

// Occasionally the auth can get stuck only in host.

// This especially happens in cases like

// url.resolveObject('mailto:local1@domain1', 'local2@domain2')

const authInHost = result.host && result.host.indexOf('@') > 0 ?

result.host.split('@') : false;

if (authInHost) {

result.auth = authInHost.shift();

result.host = result.hostname = authInHost.shift();

}

}

mustEndAbs = mustEndAbs || (result.host && srcPath.length);

if (mustEndAbs && !isAbsolute) {

srcPath.unshift('');

}

if (!srcPath.length) {

result.pathname = null;

result.path = null;

} else {

result.pathname = srcPath.join('/');

}

// To support request.http

if (result.pathname !== null || result.search !== null) {

result.path = (result.pathname ? result.pathname : '') +

(result.search ? result.search : '');

}

result.auth = relative.auth || result.auth;

result.slashes = result.slashes || relative.slashes;

result.href = result.format();

return result;

};

Url.prototype.parseHost = function parseHost() {

let host = this.host;

let port = portPattern.exec(host);

if (port) {

port = port[0];

if (port !== ':') {

this.port = port.slice(1);

}

host = host.slice(0, host.length - port.length);

}

if (host) this.hostname = host;

};

module.exports = {

// Original API

Url,