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exports.parse = urlParse;
exports.resolve = urlResolve;
exports.resolveObject = urlResolveObject;
exports.format = urlFormat;
// define these here so at least they only have to be
// compiled once on the first module load.
var protocolPattern = /^([a-z0-9]+:)/,
portPattern = /:[0-9]+$/,
nonHostChars = ['/', '?', ';', '#'],
hostlessProtocol = {
'file': true,
'file:': true
},
slashedProtocol = {
'http': true,
'https': true,
'ftp': true,
'gopher': true,
'file': true,
'http:': true,
'https:': true,
'ftp:': true,
'gopher:': true,
'file:': true
},
path = require('path'), // internal module, guaranteed to be loaded already.
querystring = require('querystring');
function urlParse(url, parseQueryString, slashesDenoteHost) {
if (url && typeof(url) === 'object' && url.href) return url;
var out = { href: url },
rest = url;
var proto = protocolPattern.exec(rest);
if (proto) {
proto = proto[0];
out.protocol = proto;
rest = rest.substr(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.
if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
var slashes = rest.substr(0, 2) === '//';
if (slashes && !(proto && hostlessProtocol[proto])) {
rest = rest.substr(2);
out.slashes = true;
}
}
if (!hostlessProtocol[proto] &&
(slashes || (proto && !slashedProtocol[proto]))) {
// there's a hostname.
// the first instance of /, ?, ;, or # ends the host.
// don't enforce full RFC correctness, just be unstupid about it.
var firstNonHost = -1;
for (var i = 0, l = nonHostChars.length; i < l; i++) {
var index = rest.indexOf(nonHostChars[i]);
if (index !== -1 &&
(firstNonHost < 0 || index < firstNonHost)) firstNonHost = index;
}
if (firstNonHost !== -1) {
out.host = rest.substr(0, firstNonHost);
rest = rest.substr(firstNonHost);
} else {
out.host = rest;
rest = '';
}
// pull out the auth and port.
var p = parseHost(out.host);
var keys = Object.keys(p);
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
out[key] = p[key];
}
// we've indicated that there is a hostname,
// so even if it's empty, it has to be present.
out.hostname = out.hostname || '';
}
// now rest is set to the post-host stuff.
// chop off from the tail first.
var hash = rest.indexOf('#');
if (hash !== -1) {
// got a fragment string.
out.hash = rest.substr(hash);
rest = rest.slice(0, hash);
}
var qm = rest.indexOf('?');
if (qm !== -1) {
out.search = rest.substr(qm);
out.query = rest.substr(qm + 1);
if (parseQueryString) {
out.query = querystring.parse(out.query);
}
rest = rest.slice(0, qm);
} else if (parseQueryString) {
// no query string, but parseQueryString still requested
out.query = {};
}
if (rest) out.pathname = rest;
return out;
}
// format a parsed object into a url string
function urlFormat(obj) {
// ensure it's an object, and not a string url.
// If it's an obj, this is a no-op.
// this way, you can call url_format() on strings
// to clean up potentially wonky urls.
if (typeof(obj) === 'string') obj = urlParse(obj);
var protocol = obj.protocol || '',
host = (obj.host !== undefined) ? obj.host :
obj.hostname !== undefined ? (
(obj.auth ? obj.auth + '@' : '') +
obj.hostname +
(obj.port ? ':' + obj.port : '')
) :
false,
pathname = obj.pathname || '',
search = obj.search || (
obj.query && ('?' + (
typeof(obj.query) === 'object' ?
querystring.stringify(obj.query) :
String(obj.query)
))
) || '',
hash = obj.hash || '';
if (protocol && protocol.substr(-1) !== ':') protocol += ':';
// only the slashedProtocols get the //. Not mailto:, xmpp:, etc.
// unless they had them to begin with.
if (obj.slashes ||
(!protocol || slashedProtocol[protocol]) && host !== false) {
host = '//' + (host || '');
if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
} else if (!host) {
host = '';
}
if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
if (search && search.charAt(0) !== '?') search = '?' + search;
return protocol + host + pathname + search + hash;
}
function urlResolve(source, relative) {
return urlFormat(urlResolveObject(source, relative));
}
function urlResolveObject(source, relative) {
if (!source) return relative;
source = urlParse(urlFormat(source), false, true);
relative = urlParse(urlFormat(relative), false, true);
// hash is always overridden, no matter what.
source.hash = relative.hash;
if (relative.href === '') return source;
// hrefs like //foo/bar always cut to the protocol.
if (relative.slashes && !relative.protocol) {
relative.protocol = source.protocol;
return relative;
}
if (relative.protocol && relative.protocol !== source.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[relative.protocol]) return relative;
source.protocol = relative.protocol;
if (!relative.host && !hostlessProtocol[relative.protocol]) {
var relPath = (relative.pathname || '').split('/');
while (relPath.length && !(relative.host = relPath.shift()));
if (!relative.host) relative.host = '';
if (relPath[0] !== '') relPath.unshift('');
if (relPath.length < 2) relPath.unshift('');
relative.pathname = relPath.join('/');
}
source.pathname = relative.pathname;
source.search = relative.search;
source.query = relative.query;
source.host = relative.host || '';
delete source.auth;
delete source.hostname;
source.port = relative.port;
return source;
}
var isSourceAbs = (source.pathname && source.pathname.charAt(0) === '/'),
isRelAbs = (
relative.host !== undefined ||
relative.pathname && relative.pathname.charAt(0) === '/'
),
mustEndAbs = (isRelAbs || isSourceAbs ||
(source.host && relative.pathname)),
removeAllDots = mustEndAbs,
srcPath = source.pathname && source.pathname.split('/') || [],
relPath = relative.pathname && relative.pathname.split('/') || [],
psychotic = source.protocol &&
!slashedProtocol[source.protocol] &&
source.host !== undefined;
// 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.
// source.protocol has already been set by now.
// Later on, put the first path part into the host field.
if (psychotic) {
delete source.hostname;
delete source.auth;
delete source.port;
if (source.host) {
if (srcPath[0] === '') srcPath[0] = source.host;
else srcPath.unshift(source.host);
}
delete source.host;
if (relative.protocol) {
delete relative.hostname;
delete relative.auth;
delete relative.port;
if (relative.host) {
if (relPath[0] === '') relPath[0] = relative.host;
else relPath.unshift(relative.host);
}
delete relative.host;
}
mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
}
if (isRelAbs) {
// it's absolute.
source.host = (relative.host || relative.host === '') ?
relative.host : source.host;
source.search = relative.search;
source.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);
source.search = relative.search;
source.query = relative.query;
} else if ('search' in relative) {
// just pull out the search.
// like href='?foo'.
// Put this after the other two cases because it simplifies the booleans
if (psychotic) {
source.host = srcPath.shift();
}
source.search = relative.search;
source.query = relative.query;
return source;
}
if (!srcPath.length) {
// no path at all. easy.
// we've already handled the other stuff above.
delete source.pathname;
return source;
}
// resolve dots.
// 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.
var last = srcPath.slice(-1)[0];
var hasTrailingSlash = (
(source.host || relative.host) && (last === '.' || last === '..') ||
last === '');
// Figure out if this has to end up as an absolute url,
// or should continue to be relative.
srcPath = path.normalizeArray(srcPath, true);
if (srcPath.length === 1 && srcPath[0] === '.') srcPath = [];
if (mustEndAbs || removeAllDots) {
// all dots must go.
var dirs = [];
srcPath.forEach(function(dir, i) {
if (dir === '..') {
dirs.pop();
} else if (dir !== '.') {
dirs.push(dir);
}
});
if (mustEndAbs && dirs[0] !== '' &&
(!dirs[0] || dirs[0].charAt(0) !== '/')) {
dirs.unshift('');
}
srcPath = dirs;
}
if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
srcPath.push('');
}
var isAbsolute = srcPath[0] === '' ||
(srcPath[0] && srcPath[0].charAt(0) === '/');
// put the host back
if (psychotic) {
source.host = isAbsolute ? '' : srcPath.shift();
}
mustEndAbs = mustEndAbs || (source.host && srcPath.length);
if (mustEndAbs && !isAbsolute) {
srcPath.unshift('');
}
source.pathname = srcPath.join('/');
return source;
}
function parseHost(host) {
var out = {};
var at = host.indexOf('@');
if (at !== -1) {
out.auth = host.substr(0, at);
host = host.substr(at + 1); // drop the @
}
var port = portPattern.exec(host);
if (port) {
port = port[0];
out.port = port.substr(1);
host = host.substr(0, host.length - port.length);
}
if (host) out.hostname = host;
return out;
}