mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-30 14:09:42 -05:00
616146f904
* Various Mermaid improvments - Render into iframe for improved security - Use built-in dark theme instead of color inversion - Remove flexbox attributes, resulting in more consistent size rendering - Update API usage and update to latest version * restart ci * misc tweaks * remove unneccesary declaration * make it work without allow-same-origin, add loading=lazy * remove loading attribute, does not seem to work * rename variable * skip roundtrip to DOM for rendering * don't guess chart height * update comment to make it clear it's intentional * tweak * replace deprecated 'scrolling' property * remove unused css file Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
import {isDarkTheme} from '../utils.js';
|
|
const {mermaidMaxSourceCharacters} = window.config;
|
|
|
|
const iframeCss = `
|
|
body {margin: 0; padding: 0}
|
|
#mermaid {display: block; margin: 0 auto}
|
|
`;
|
|
|
|
function displayError(el, err) {
|
|
el.closest('pre').classList.remove('is-loading');
|
|
const errorNode = document.createElement('div');
|
|
errorNode.setAttribute('class', 'ui message error markup-block-error mono');
|
|
errorNode.textContent = err.str || err.message || String(err);
|
|
el.closest('pre').before(errorNode);
|
|
}
|
|
|
|
export async function renderMermaid() {
|
|
const els = document.querySelectorAll('.markup code.language-mermaid');
|
|
if (!els.length) return;
|
|
|
|
const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
|
|
|
|
mermaid.initialize({
|
|
startOnLoad: false,
|
|
theme: isDarkTheme() ? 'dark' : 'neutral',
|
|
securityLevel: 'strict',
|
|
});
|
|
|
|
for (const el of els) {
|
|
const source = el.textContent;
|
|
|
|
if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
|
|
displayError(el, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
|
|
continue;
|
|
}
|
|
|
|
let valid;
|
|
try {
|
|
valid = mermaid.parse(source);
|
|
} catch (err) {
|
|
displayError(el, err);
|
|
}
|
|
|
|
if (!valid) {
|
|
el.closest('pre').classList.remove('is-loading');
|
|
continue;
|
|
}
|
|
|
|
try {
|
|
// can't use bindFunctions here because we can't cross the iframe boundary. This
|
|
// means js-based interactions won't work but they aren't intended to work either
|
|
mermaid.mermaidAPI.render('mermaid', source, (svgStr) => {
|
|
const heightStr = (svgStr.match(/height="(.+?)"/) || [])[1];
|
|
if (!heightStr) return displayError(el, new Error('Could not determine chart height'));
|
|
const iframe = document.createElement('iframe');
|
|
iframe.classList.add('markup-render');
|
|
iframe.sandbox = 'allow-scripts';
|
|
iframe.style.height = `${Math.ceil(parseFloat(heightStr))}px`;
|
|
iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svgStr}</body></html>`;
|
|
el.closest('pre').replaceWith(iframe);
|
|
});
|
|
} catch (err) {
|
|
displayError(el, err);
|
|
}
|
|
}
|
|
}
|