►Web Server: HTTP Server
▼2 Dispatchers
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url->path/ c
make-url->path
make-url->valid-path
filter-url->path
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2.2 Mapping URLs to Paths

 (require web-server/dispatchers/filesystem-map)
This module provides a means of mapping URLs to paths on the filesystem.

value

url->path/c : contract?

This contract is equivalent to (->* (url?) (path? (listof path-piece?))). The returned path? is the path on disk. The list is the list of path elements that correspond to the path of the URL.

procedure

(make-url->path base) → url->path/c

  base : path-string?
The url->path/c returned by this procedure considers the root URL to be base. It ensures that ".."s in the URL do not escape the base and removes them silently otherwise.

procedure

(make-url->valid-path url->path) → url->path/c

  url->path : url->path/c
Runs the underlying url->path, but only returns if the path refers to a file that actually exists. If it is does not, then the suffix elements of the URL are removed until a file is found. If this never occurs, then an error is thrown.

This is primarily useful for dispatchers that allow path information after the name of a service to be used for data, but where the service is represented by a file. The most prominent example is obviously servlets.

procedure

(filter-url->path regex url->path) → url->path/c

  regex : regexp?
  url->path : url->path/c
Runs the underlying url->path but will only return if the path, when considered as a string, matches the regex. This is useful to disallow strange files, like GIFs, from being considered servlets when using the servlet dispatchers. It will return a exn:fail:filesystem:exists? exception if the path does not match.

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