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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = minifyUrls;
var _helpers = require("../helpers");
const RelateUrl = (0, _helpers.optionalRequire)('relateurl');
const srcset = (0, _helpers.optionalRequire)('srcset');
const terser = (0, _helpers.optionalRequire)('terser'); // Adopts from https://github.com/kangax/html-minifier/blob/51ce10f4daedb1de483ffbcccecc41be1c873da2/src/htmlminifier.js#L209-L221
const tagsHaveUriValuesForAttributes = new Set(['a', 'area', 'link', 'base', 'object', 'blockquote', 'q', 'del', 'ins', 'form', 'input', 'head', 'audio', 'embed', 'iframe', 'img', 'script', 'track', 'video']);
const tagsHasHrefAttributes = new Set(['a', 'area', 'link', 'base']);
const attributesOfImgTagHasUriValues = new Set(['src', 'longdesc', 'usemap']);
const attributesOfObjectTagHasUriValues = new Set(['classid', 'codebase', 'data', 'usemap']);
const tagsHasCiteAttributes = new Set(['blockquote', 'q', 'ins', 'del']);
const tagsHasSrcAttributes = new Set(['audio', 'embed', 'iframe', 'img', 'input', 'script', 'track', 'video',
/**
* https://html.spec.whatwg.org/#attr-source-src
*
* Although most of browsers recommend not to use "src" in <source>,
* but technically it does comply with HTML Standard.
*/
'source']);
const isUriTypeAttribute = (tag, attr) => {
return tagsHasHrefAttributes.has(tag) && attr === 'href' || tag === 'img' && attributesOfImgTagHasUriValues.has(attr) || tag === 'object' && attributesOfObjectTagHasUriValues.has(attr) || tagsHasCiteAttributes.has(tag) && attr === 'cite' || tag === 'form' && attr === 'action' || tag === 'input' && attr === 'usemap' || tag === 'head' && attr === 'profile' || tag === 'script' && attr === 'for' || tagsHasSrcAttributes.has(tag) && attr === 'src';
};
const isSrcsetAttribute = (tag, attr) => {
return tag === 'source' && attr === 'srcset' || tag === 'img' && attr === 'srcset' || tag === 'link' && attr === 'imagesrcset';
};
const processModuleOptions = options => {
// FIXME!
// relateurl@1.0.0-alpha only supports URL while stable version (0.2.7) only supports string
// should convert input into URL instance after relateurl@1 is stable
if (typeof options === 'string') return options;
if (options instanceof URL) return options.toString();
return false;
};
const isLinkRelCanonical = ({
tag,
attrs
}) => {
// Return false early for non-"link" tag
if (tag !== 'link') return false;
for (const [attrName, attrValue] of Object.entries(attrs)) {
if (attrName.toLowerCase() === 'rel' && attrValue === 'canonical') return true;
}
return false;
};
const JAVASCRIPT_URL_PROTOCOL = 'javascript:';
let relateUrlInstance;
let STORED_URL_BASE;
/** Convert absolute url into relative url */
function minifyUrls(tree, options, moduleOptions) {
let promises = [];
const urlBase = processModuleOptions(moduleOptions); // Invalid configuration, return tree directly
if (!urlBase) return tree;
/** Bring up a reusable RelateUrl instances (only once)
*
* STORED_URL_BASE is used to invalidate RelateUrl instances,
* avoiding require.cache acrossing multiple htmlnano instance with different configuration,
* e.g. unit tests cases.
*/
if (!relateUrlInstance || STORED_URL_BASE !== urlBase) {
if (RelateUrl) {
relateUrlInstance = new RelateUrl(urlBase);
}
STORED_URL_BASE = urlBase;
}
tree.walk(node => {
if (!node.attrs) return node;
if (!node.tag) return node;
if (!tagsHaveUriValuesForAttributes.has(node.tag)) return node; // Prevent link[rel=canonical] being processed
// Can't be excluded by isUriTypeAttribute()
if (isLinkRelCanonical(node)) return node;
for (const [attrName, attrValue] of Object.entries(node.attrs)) {
const attrNameLower = attrName.toLowerCase();
if (isUriTypeAttribute(node.tag, attrNameLower)) {
if (isJavaScriptUrl(attrValue)) {
promises.push(minifyJavaScriptUrl(node, attrName));
} else {
if (relateUrlInstance) {
// FIXME!
// relateurl@1.0.0-alpha only supports URL while stable version (0.2.7) only supports string
// the WHATWG URL API is very strict while attrValue might not be a valid URL
// new URL should be used, and relateUrl#relate should be wrapped in try...catch after relateurl@1 is stable
node.attrs[attrName] = relateUrlInstance.relate(attrValue);
}
}
continue;
}
if (isSrcsetAttribute(node.tag, attrNameLower)) {
if (srcset) {
try {
const parsedSrcset = srcset.parse(attrValue);
node.attrs[attrName] = srcset.stringify(parsedSrcset.map(srcset => {
if (relateUrlInstance) {
srcset.url = relateUrlInstance.relate(srcset.url);
}
return srcset;
}));
} catch (e) {// srcset will throw an Error for invalid srcset.
}
}
continue;
}
}
return node;
});
if (promises.length > 0) return Promise.all(promises).then(() => tree);
return Promise.resolve(tree);
}
function isJavaScriptUrl(url) {
return typeof url === 'string' && url.toLowerCase().startsWith(JAVASCRIPT_URL_PROTOCOL);
}
function minifyJavaScriptUrl(node, attrName) {
if (!terser) return Promise.resolve();
const jsWrapperStart = 'function a(){';
const jsWrapperEnd = '}a();';
let result = node.attrs[attrName];
if (result) {
result = result.slice(JAVASCRIPT_URL_PROTOCOL.length);
return terser.minify(result, {}) // Default Option is good enough
.then(({
code
}) => {
const minifiedJs = code.substring(jsWrapperStart.length, code.length - jsWrapperEnd.length);
node.attrs[attrName] = minifiedJs;
});
}
return Promise.resolve();
}