82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
const {HttpError} = require('../server/HttpError');
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const {RequestHandler} = require('../server/RequestHandler');
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const {VirtualSequenceDiagram} = require('../../lib/sequence-diagram');
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const NUM_MATCH = '[0-9]+(?:\\.[0-9]+)?';
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function beginTimer() {
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return process.hrtime();
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}
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function endTimer(timer) {
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const delay = process.hrtime(timer);
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return delay[0] * 1e9 + delay[1];
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}
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function getNumeric(v, name) {
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if(!v) {
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return null;
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}
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const n = Number.parseFloat(v);
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if(Number.isNaN(n)) {
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throw new HttpError(400, 'Invalid value for ' + name);
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}
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return n;
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}
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function readEncoded(str, encoding) {
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switch(encoding) {
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case 'b64':
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return Buffer
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.from(decodeURIComponent(str), 'base64')
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.toString('utf8');
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case 'uri':
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return str.split('/').map(decodeURIComponent).join('\n');
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default:
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throw new HttpError(400, 'Unknown encoding');
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}
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}
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class RenderRequestHandler extends RequestHandler {
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constructor(baseUrlPattern) {
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super('GET', new RegExp(
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`^${baseUrlPattern}/` +
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`(?:(?:w(${NUM_MATCH}))?(?:h(${NUM_MATCH}))?/|z(${NUM_MATCH})/)?` +
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'(?:(uri|b64)/)?' +
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'(.*?)' +
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'(?:\\.(svg))?$',
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'i'
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));
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this.info = `Rendering sequence diagrams at ${baseUrlPattern}/`;
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}
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handle(req, res, {match, pickEncoding, log, writeEncoded}) {
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this.applyCommonHeaders(req, res);
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const encoding = pickEncoding();
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const size = {
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height: getNumeric(match[2], 'height'),
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width: getNumeric(match[1], 'width'),
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zoom: getNumeric(match[3], 'zoom'),
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};
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const code = readEncoded(match[5], (match[4] || 'uri').toLowerCase());
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const format = (match[6] || 'svg').toLowerCase();
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const timer = beginTimer();
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const svg = VirtualSequenceDiagram.render(code, {size});
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const delay = endTimer(timer);
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log('RENDER (' + (delay / 1e6).toFixed(3) + 'ms)');
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switch(format) {
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case 'svg':
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res.setHeader('Content-Type', 'image/svg+xml; charset=utf-8');
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writeEncoded(encoding, svg);
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break;
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default:
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throw new HttpError(400, 'Unsupported image format');
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}
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}
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}
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module.exports = {RenderRequestHandler};
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