Feature: #86214 - Implement static routes

See Issue #86214

Description

The site configuration module now has configuration options to add static routes on a per site basis. Take the following example: In a multi-site installation you want to have different robots.txt files for each site that should be reachable at /robots.txt on each site. You can now add a static route "robots.txt" to your site and define which content should be delivered.

The TYPO3 SEO extension provides a sitemap for TYPO3 out of the box, but it's only reachable at a specific page type. To enable easier access you can now configure a static route sitemap.xml that maps to that page type (see example below).

Routes can be configured as toplevel files (as in the sitemap.xml and robots.txt case) but may also be configured to deeper route paths (my/deep/path/to/a/static/text for example). Matching is done on the full path but without any parameters.

Impact

Static routes can be configured via the user interface or directly in the yaml configuration. There are two options: deliver static text or resolve a TYPO3 URL.

StaticText

The staticText option allows to deliver simple text content. The text can be added through a text field directly in the site configuration. This is suitable for files like robots.txt or humans.txt.

YAML Configuration Example:

route: robots.txt
type: staticText
content: |
  Sitemap: https://example.com/sitemap.xml
  User-agent: *
  Allow: /
  Disallow: /forbidden/

TYPO3 URL (t3://)

The type uri for TYPO3 URL provides the option to render either a file, page or url. Internally a request to the file or URL is done and its content delivered.

YAML Configuration Examples:

-
  route: sitemap.xml
  type: uri
  source: 't3://page?uid=1&type=1533906435'
-
  route: favicon.ico
  type: uri
  source: 't3://file?uid=77'

Implementation

Static route resolving is implemented as a PSR-15 middleware. If the route path requested matches any one of the configured site routes, a response is directly generated and returned. This way there is minimal bootstrap code to be executed on a static route resolving request, mainly the site configuration needs to be loaded. Static routes cannot get parameters as the matching is done solely on the path level.