Fix serveFiles to work w/ dynamic swaggerDoc

`serveFiles` did not respect on-the-fly changes in a swagger doc,
but rendered the old content.

The fix now also enables this pattern, where `serveFiles` doesn't need
the swaggerDoc upfront (which is desired in dynamic cases):

```js
app.use('/api-docs-dynamic', function(req, res, next){
  swaggerDocument.info.description = `Hello ${count}!`;
  req.swaggerDoc = swaggerDocument;
  next();
}, swaggerUi.serveFiles(), swaggerUi.setup());
//                     ^^^
```

index.js

@@ -139,7 +139,7 @@ window.onload = function() {
  const authorized = ui.preauthorizeApiKey(key, value);
  if(!!authorized) clearInterval(pid);
  }, 500)
- 
+
  }
  }
 
@@ -254,6 +254,7 @@ var swaggerInitFunction = function (swaggerDoc, opts) {
  res.sendStatus(404)
  } else if (trimQuery(req.url).endsWith('/swagger-ui-init.js')) {
  if (req.swaggerDoc) {
+ opts.swaggerDoc = req.swaggerDoc
  swaggerInitFile = jsTplString.toString().replace('<% swaggerOptions %>', stringify(opts))
  }
  res.set('Content-Type', 'application/javascript')

test/test.spec.js

@@ -120,4 +120,13 @@ describe('integration', function() {
  assert(!classes.includes('unlocked'));
  });
 
+ it('should have API Documentation hosted at /api-docs-dynamic', async function() {
+ const httpResponse = await sitepage.goto('http://localhost:3001/api-docs-dynamic/');
+ assert.ok(httpResponse.ok());
+ const html = await sitepage.evaluate(() => document.querySelector('.swagger-ui').innerHTML);
+ assert.ok(html);
+ console.log(html);
+ assert.match(html, /Hello [\d]+/);
+ });
+
 });

test/testapp/app.js

@@ -101,6 +101,14 @@ var swaggerHtml = swaggerUi.generateHTML(swaggerDocument, swaggerUiOpts)
 app.use('/api-docs-html1', swaggerUi.serveFiles(swaggerDocument, swaggerUiOpts))
 app.get('/api-docs-html1', (req, res) => { res.send(swaggerHtml) });
 
+let count = 0
+app.use('/api-docs-dynamic', function(req, res, next){
+ count = count + 1
+ swaggerDocument.info.description = `Hello ${count}!`;
+ req.swaggerDoc = swaggerDocument;
+ next();
+}, swaggerUi.serveFiles(), swaggerUi.setup());
+
 var swaggerUiOpts3 = {
  explorer: false,
  swaggerOptions: options,
@@ -113,14 +121,6 @@ var swaggerUiOpts3 = {
 app.use('/api-docs-jsstr', swaggerUi.serve)
 app.get('/api-docs-jsstr', swaggerUi.setup(null, swaggerUiOpts3));
 
-// let count = 0
-// app.use('/api-docs-dynamic', function(req, res, next){
-// count = count + 1
-// swaggerDocument.info.description = `Hello ${count}!`;
-// req.swaggerDoc = swaggerDocument;
-// next();
-// }, swaggerUi.serveFiles(swaggerDocument, options), swaggerUi.setup());
-
 var swaggerUiOpts4 = {
  swaggerOptions: {
  url: 'http://localhost:' + (app.get('port') || 3001) + '/swagger.json'