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parse.js
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parse.js
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/*
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the 'License');
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an 'AS IS' BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import qs from 'querystring';
import format from './format';
import { BASE_URL, HOST } from './constants';
const slashedProtocols = /^https?|ftp|gopher|file/;
const urlRegex = /^(.*?)([#?].*)/;
const protocolRegex = /^([a-z0-9.+-]*:)(\/{0,3})(.*)/i;
const slashesRegex = /^([a-z0-9.+-]*:)?\/\/\/*/i;
const ipv6Regex = /^([a-z0-9.+-]*:)(\/{0,2})\[(.*)\]$/i;
function safeDecode(url) {
try {
return decodeURI(url);
} catch (_) {
return url;
}
}
export default function(urlStr, parseQs = false, slashesDenoteHost = false) {
urlStr = urlStr.trim();
const slashesMatch = urlStr.match(urlRegex);
if (slashesMatch) {
urlStr = safeDecode(slashesMatch[1]).replace(/\\/g, '/') + slashesMatch[2];
} else {
urlStr = safeDecode(urlStr).replace(/\\/g, '/');
}
// IPv6 check
if (ipv6Regex.test(urlStr)) {
// Add trailing slash to IPV6 urls to match parsing
if (urlStr.slice(-1) !== '/') urlStr += '/';
}
const protocolMatch =
!/(^javascript)/.test(urlStr) && urlStr.match(protocolRegex);
let slashes = slashesRegex.test(urlStr);
let protocolPrefix = '';
if (protocolMatch) {
if (!slashedProtocols.test(protocolMatch[1])) {
// Replace invalid protocol with a valid one for correct parsing
protocolPrefix = protocolMatch[1].toLowerCase();
urlStr = `${protocolMatch[2]}${protocolMatch[3]}`;
}
if (!protocolMatch[2]) {
slashes = false;
if (slashedProtocols.test(protocolMatch[1])) {
protocolPrefix = protocolMatch[1];
urlStr = `${protocolMatch[3]}`;
} else {
urlStr = `//${protocolMatch[3]}`;
}
}
// Handle '///' in url Eg: http:///s//a/b/c
// TODO: file:/some/dir/# should become file:///some/dir/# according to the url module in node
if (protocolMatch[2].length === 3 || protocolMatch[2].length === 1) {
protocolPrefix = protocolMatch[1];
urlStr = `/${protocolMatch[3]}`;
}
}
// If port is 80 we change it to 8000 and undo it later
let portMatch = urlStr.match(/(:[0-9]+)/);
let portSuffix = '';
if (portMatch && portMatch[1] && portMatch[1].length === 3) {
portSuffix = portMatch[1];
urlStr = urlStr.replace(portSuffix, `${portSuffix}00`);
}
let url;
let res = {};
let err = '';
let preSlash = '';
try {
url = new URL(urlStr);
} catch (e) {
err = e;
// Handle url with slashes - Eg: //some_url
if (
!protocolPrefix &&
!slashesDenoteHost &&
/^\/\//.test(urlStr) &&
!/^\/\/.+[@.]/.test(urlStr)
) {
preSlash = '/';
urlStr = urlStr.substr(1);
}
try {
url = new URL(urlStr, BASE_URL);
} catch (_) {
// Unable to parse the url
// If the URL has only the protocol - Eg: "foo:"
res.protocol = protocolPrefix;
res.href = protocolPrefix;
return res;
}
}
res.slashes = slashes && !preSlash;
res.host = url.host === HOST ? '' : url.host;
res.hostname =
url.hostname === HOST ? '' : url.hostname.replace(/(\[|\])/g, '');
res.protocol = err ? protocolPrefix || null : url.protocol;
res.search = url.search.replace(/\\/g, '%5C');
res.hash = url.hash.replace(/\\/g, '%5C');
const hashSplit = urlStr.split('#');
// Handle case when there is a lone '?' in url
// Eg: http://example.com/?
if (!res.search && ~hashSplit[0].indexOf('?')) {
res.search = '?';
}
// Similarly handle lone '#' Eg: http://example.com/#
if (!res.hash && hashSplit[1] === '') {
res.hash = '#';
}
// URLSearchParams is not supported in Edge 16
// res.query = res.searchParams;
res.query = parseQs ? qs.decode(url.search.substr(1)) : res.search.substr(1);
res.pathname = preSlash + safeDecode(url.pathname).replace(/"/g, '%22');
// Chrome parses "#abc" as "about:blank#abc"
if (res.protocol === 'about:' && res.pathname === 'blank') {
res.protocol = '';
res.pathname = '';
}
// Partial url that does not start with a /
// example www.example.com
if (err && urlStr[0] !== '/') res.pathname = res.pathname.substr(1);
// Remove additional trailing slashes added by URL
if (
protocolPrefix &&
!slashedProtocols.test(protocolPrefix) &&
urlStr.slice(-1) !== '/' &&
res.pathname === '/'
) {
res.pathname = '';
}
res.path = res.pathname + res.search;
res.auth = [url.username, url.password]
.map(decodeURIComponent)
.filter(Boolean)
.join(':');
res.port = url.port;
// Undo port to its original value, 8000 -> 80
if (portSuffix) {
res.host = res.host.replace(`${portSuffix}00`, portSuffix);
res.port = res.port.slice(0, -2);
}
res.href = preSlash ? `${res.pathname}${res.search}${res.hash}` : format(res);
const excludedKeys = /^(file)/.test(res.href) ? ['host', 'hostname'] : [];
Object.keys(res).forEach(k => {
if (!~excludedKeys.indexOf(k)) res[k] = res[k] || null;
});
return res;
}