const {RequestHandler} = require('../server/RequestHandler');
const {VirtualSequenceDiagram} = require('../../lib/sequence-diagram');
const UNSAFE_HTML = /[^a-zA-Z0-9 :;.,]/g;
const escChar = (c) => `&#x${c.charCodeAt(0).toString(16).padStart(4, '0')};`;
const escapeHTML = (v) => v.replaceAll(UNSAFE_HTML, escChar);
class PreviewRequestHandler extends RequestHandler {
constructor(baseUrlPattern) {
super('GET', new RegExp(`^${baseUrlPattern}/?(.*)$`, 'i'));
this.info = `Rendering preview at ${baseUrlPattern}/`;
}
handle(req, res, {match, pickEncoding, writeEncoded}) {
this.applyCommonHeaders(req, res);
res.setHeader('Content-Type', 'text/html; charset=utf-8');
const encoding = pickEncoding();
const params = new URLSearchParams(match[1]);
const code = params.get('c');
const encoded = code
.replaceAll(/[\r\n]+/g, '\n')
.split('\n')
.filter((ln) => ln !== '')
.map(encodeURIComponent)
.join('/');
let content = '';
try {
new VirtualSequenceDiagram().process(code);
content = [
'',
'',
'',
'',
'',
'',
`
`,
'',
'',
].join('');
} catch(e) {
content = [
'',
'',
'',
'',
'',
'',
`${escapeHTML(String(e))}
`,
'',
'',
].join('');
}
writeEncoded(encoding, content);
}
}
module.exports = {PreviewRequestHandler};