node/lib/url.js at reload · robbles/node · GitHub

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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

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;

}

// 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 === '');

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

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

var up = 0;

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

last = srcPath[i];

if (last == '.') {

srcPath.splice(i, 1);

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

srcPath.splice(i, 1);

up++;

} else if (up) {

srcPath.splice(i, 1);

up--;

}

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

if (!mustEndAbs && !removeAllDots) {

for (; up--; up) {

srcPath.unshift('..');

}

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

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

srcPath.unshift('');

}

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;

}

node/lib/url.js at reload · robbles/node · GitHub

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