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joplin/packages/lib/clipperUtils.ts

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// Do not import anything here -- the built version of this file is copied to packages/app-clipper's
// content_scripts folder.
function absoluteUrl(url: string) {
if (!url) return url;
const protocol = url.toLowerCase().split(':')[0];
if (['http', 'https', 'file', 'data'].indexOf(protocol) >= 0) return url;
if (url.indexOf('//') === 0) {
return location.protocol + url;
} else if (url[0] === '/') {
return `${location.protocol}//${location.host}${url}`;
} else {
return `${baseUrl()}/${url}`;
}
}
function pageLocationOrigin() {
// location.origin normally returns the protocol + domain + port (eg. https://example.com:8080)
// but for file:// protocol this is browser dependant and in particular Firefox returns "null"
// in this case.
if (location.protocol === 'file:') {
return 'file://';
} else {
return location.origin;
}
}
function baseUrl() {
let output = pageLocationOrigin() + location.pathname;
if (output[output.length - 1] !== '/') {
const output2 = output.split('/');
output2.pop();
output = output2.join('/');
}
return output;
}
function getJoplinClipperSvgClassName(svg: SVGSVGElement) {
for (const className of svg.classList) {
if (className.indexOf('joplin-clipper-svg-') === 0) return className;
}
return '';
}
type ImageObject = {
width: number;
height: number;
naturalWidth?: number;
naturalHeight?: number;
};
export function getImageSizes(element: Document, forceAbsoluteUrls = false) {
const output: Record<string, ImageObject[]> = {};
const images = element.getElementsByTagName('img');
for (let i = 0; i < images.length; i++) {
const img = images[i];
if (img.classList && img.classList.contains('joplin-clipper-hidden')) continue;
let src = imageSrc(img);
src = forceAbsoluteUrls ? absoluteUrl(src) : src;
if (!output[src]) output[src] = [];
output[src].push({
width: img.width,
height: img.height,
naturalWidth: img.naturalWidth,
naturalHeight: img.naturalHeight,
});
}
const svgs = element.getElementsByTagName('svg');
for (let i = 0; i < svgs.length; i++) {
const svg = svgs[i];
if (svg.classList && svg.classList.contains('joplin-clipper-hidden')) continue;
const className = getJoplinClipperSvgClassName(svg);// 'joplin-clipper-svg-' + i;
if (!className) {
console.warn('SVG without a Joplin class:', svg);
continue;
}
if (!svg.classList.contains(className)) {
svg.classList.add(className);
}
const rect = svg.getBoundingClientRect();
if (!output[className]) output[className] = [];
output[className].push({
width: rect.width,
height: rect.height,
});
}
return output;
}
// In general we should use currentSrc because that's the image that's currently displayed,
// especially within <picture> tags or with srcset. In these cases there can be multiple
// sources and the best one is probably the one being displayed, thus currentSrc.
function imageSrc(image: HTMLImageElement) {
if (image.currentSrc) return image.currentSrc;
return image.src;
}
// Given a document, return a <style> tag that contains all the styles
// required to render the page. Not currently used but could be as an
// option to clip pages as HTML.
// eslint-disable-next-line
export function getStyleSheets(doc: Document) {
const output = [];
for (let i = 0; i < doc.styleSheets.length; i++) {
const sheet = doc.styleSheets[i];
try {
for (const cssRule of sheet.cssRules) {
output.push({ type: 'text', value: cssRule.cssText });
}
} catch (error) {
// Calling sheet.cssRules will throw a CORS error on Chrome if the stylesheet is on a different domain.
// In that case, we skip it and add it to the list of stylesheet URLs. These URls will be downloaded
// by the desktop application, since it doesn't have CORS restrictions.
// eslint-disable-next-line
console.info('Could not retrieve stylesheet now:', sheet.href);
// eslint-disable-next-line
console.info('It will downloaded by the main application.');
// eslint-disable-next-line
console.info(error);
output.push({ type: 'url', value: sheet.href });
}
}
return output;
}
// Required to run in Firefox with tabs.executeScript. See
// https://stackoverflow.com/a/44774834
undefined;