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'use strict';
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
const DATA_URL_DEFAULT_MIME_TYPE = 'text/plain';
const DATA_URL_DEFAULT_CHARSET = 'us-ascii';
const testParameter = (name, filters) => {
return filters.some(filter => filter instanceof RegExp ? filter.test(name) : filter === name);
};
const normalizeDataURL = (urlString, {stripHash}) => {
const match = /^data:(?<type>[^,]*?),(?<data>[^#]*?)(?:#(?<hash>.*))?$/.exec(urlString);
if (!match) {
throw new Error(`Invalid URL: ${urlString}`);
}
let {type, data, hash} = match.groups;
const mediaType = type.split(';');
hash = stripHash ? '' : hash;
let isBase64 = false;
if (mediaType[mediaType.length - 1] === 'base64') {
mediaType.pop();
isBase64 = true;
}
// Lowercase MIME type
const mimeType = (mediaType.shift() || '').toLowerCase();
const attributes = mediaType
.map(attribute => {
let [key, value = ''] = attribute.split('=').map(string => string.trim());
// Lowercase `charset`
if (key === 'charset') {
value = value.toLowerCase();
if (value === DATA_URL_DEFAULT_CHARSET) {
return '';
}
}
return `${key}${value ? `=${value}` : ''}`;
})
.filter(Boolean);
const normalizedMediaType = [
...attributes
];
if (isBase64) {
normalizedMediaType.push('base64');
}
if (normalizedMediaType.length !== 0 || (mimeType && mimeType !== DATA_URL_DEFAULT_MIME_TYPE)) {
normalizedMediaType.unshift(mimeType);
}
return `data:${normalizedMediaType.join(';')},${isBase64 ? data.trim() : data}${hash ? `#${hash}` : ''}`;
};
const normalizeUrl = (urlString, options) => {
options = {
defaultProtocol: 'http:',
normalizeProtocol: true,
forceHttp: false,
forceHttps: false,
stripAuthentication: true,
stripHash: false,
stripTextFragment: true,
stripWWW: true,
removeQueryParameters: [/^utm_\w+/i],
removeTrailingSlash: true,
removeSingleSlash: true,
removeDirectoryIndex: false,
sortQueryParameters: true,
...options
};
urlString = urlString.trim();
// Data URL
if (/^data:/i.test(urlString)) {
return normalizeDataURL(urlString, options);
}
if (/^view-source:/i.test(urlString)) {
throw new Error('`view-source:` is not supported as it is a non-standard protocol');
}
const hasRelativeProtocol = urlString.startsWith('//');
const isRelativeUrl = !hasRelativeProtocol && /^\.*\//.test(urlString);
// Prepend protocol
if (!isRelativeUrl) {
urlString = urlString.replace(/^(?!(?:\w+:)?\/\/)|^\/\//, options.defaultProtocol);
}
const urlObj = new URL(urlString);
if (options.forceHttp && options.forceHttps) {
throw new Error('The `forceHttp` and `forceHttps` options cannot be used together');
}
if (options.forceHttp && urlObj.protocol === 'https:') {
urlObj.protocol = 'http:';
}
if (options.forceHttps && urlObj.protocol === 'http:') {
urlObj.protocol = 'https:';
}
// Remove auth
if (options.stripAuthentication) {
urlObj.username = '';
urlObj.password = '';
}
// Remove hash
if (options.stripHash) {
urlObj.hash = '';
} else if (options.stripTextFragment) {
urlObj.hash = urlObj.hash.replace(/#?:~:text.*?$/i, '');
}
// Remove duplicate slashes if not preceded by a protocol
if (urlObj.pathname) {
urlObj.pathname = urlObj.pathname.replace(/(?<!\b(?:[a-z][a-z\d+\-.]{1,50}:))\/{2,}/g, '/');
}
// Decode URI octets
if (urlObj.pathname) {
try {
urlObj.pathname = decodeURI(urlObj.pathname);
} catch (_) {}
}
// Remove directory index
if (options.removeDirectoryIndex === true) {
options.removeDirectoryIndex = [/^index\.[a-z]+$/];
}
if (Array.isArray(options.removeDirectoryIndex) && options.removeDirectoryIndex.length > 0) {
let pathComponents = urlObj.pathname.split('/');
const lastComponent = pathComponents[pathComponents.length - 1];
if (testParameter(lastComponent, options.removeDirectoryIndex)) {
pathComponents = pathComponents.slice(0, pathComponents.length - 1);
urlObj.pathname = pathComponents.slice(1).join('/') + '/';
}
}
if (urlObj.hostname) {
// Remove trailing dot
urlObj.hostname = urlObj.hostname.replace(/\.$/, '');
// Remove `www.`
if (options.stripWWW && /^www\.(?!www\.)(?:[a-z\-\d]{1,63})\.(?:[a-z.\-\d]{2,63})$/.test(urlObj.hostname)) {
// Each label should be max 63 at length (min: 1).
// Source: https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
// Each TLD should be up to 63 characters long (min: 2).
// It is technically possible to have a single character TLD, but none currently exist.
urlObj.hostname = urlObj.hostname.replace(/^www\./, '');
}
}
// Remove query unwanted parameters
if (Array.isArray(options.removeQueryParameters)) {
for (const key of [...urlObj.searchParams.keys()]) {
if (testParameter(key, options.removeQueryParameters)) {
urlObj.searchParams.delete(key);
}
}
}
if (options.removeQueryParameters === true) {
urlObj.search = '';
}
// Sort query parameters
if (options.sortQueryParameters) {
urlObj.searchParams.sort();
}
if (options.removeTrailingSlash) {
urlObj.pathname = urlObj.pathname.replace(/\/$/, '');
}
const oldUrlString = urlString;
// Take advantage of many of the Node `url` normalizations
urlString = urlObj.toString();
if (!options.removeSingleSlash && urlObj.pathname === '/' && !oldUrlString.endsWith('/') && urlObj.hash === '') {
urlString = urlString.replace(/\/$/, '');
}
// Remove ending `/` unless removeSingleSlash is false
if ((options.removeTrailingSlash || urlObj.pathname === '/') && urlObj.hash === '' && options.removeSingleSlash) {
urlString = urlString.replace(/\/$/, '');
}
// Restore relative protocol, if applicable
if (hasRelativeProtocol && !options.normalizeProtocol) {
urlString = urlString.replace(/^http:\/\//, '//');
}
// Remove http/https
if (options.stripProtocol) {
urlString = urlString.replace(/^(?:https?:)?\/\//, '');
}
return urlString;
};
module.exports = normalizeUrl;
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