reserve

`file` handler

Answers the request using file system.

{
  "match": "^/(.*)",
  "file": "./$1"
}

Example of mapping with the file handler

Features

Supports GET and HEAD
Capturing groups can be used as substitution parameters
Always relative to the handler’s cwd member (see mappings)
- 🛂 Path traversal is blocked
Incoming URL parameters (and hash) are removed when resolving to file system names
Directory access is mapped to the inner index.html file (if any)
If the path resolves to a missing / unreadable / invalid file or directory, the handler does not process the request

[!WARNING] Folder names are case-sensitively checked (Windows)

Supports Range HTTP header (only one range)
If the response already owns a statusCode different from 200, the file handler will keep it
Only a limited subset of mime types is pre-configured (see mime.json), use mime-types to extend

Options

option	type	default	description
`mime-types`	`{ [key: string]: string }`	`{}`	Dictionary indexed by file extension that overrides mime type resolution. For instance : `{ "gsf": "application/x-font-ghostscript" }`.
`caching-strategy`	`'modified'` \| `number`	`0`	Configures caching strategy : • `'modified'` : use file last modification date, meaning the response header will contain `Last-Modified` and the handler reacts to request headers `If-Modified-Since` and `If-Range`, • `number` : duration (in seconds), based on the response header `Cache-Control` with `max-age`, • `0` : `Cache-Control` with `no-store`.
`custom-file-system`	`ExternalModule` \| `CustomFileSystem`	`undefined`	Provides custom file system API (see below).
`static`	`boolean` \| `PunycacheOptions`	`false`	Cache file system information for performance. An object can be used to pass options to the cache handler, see `punycache` documentation.

[!WARNING] When static is enabled, REserve does not expect the files / folders to change. For instance, if the file size changes while its information is being cached, the result might appear corrupted.

Custom File System

The custom file system is an object exposing several asynchronous methods.

`async readdir (folderPath)`

This is the asynchronous equivalent of fs.readdir. No option is transmitted.

It must return a promise resolved to an array of names listing the files or folders contained in the folderPath.

`async stat (filePath)`

This is the asynchronous equivalent of fs.stat. No option is transmitted.

It must return an object equivalent to fs.Stats but limited to :

`async createReadStream (filePath, options)`

This is the asynchronous equivalent of fs.createReadStream. When options is specified, it contains only start and end.

It must return a readable stream.

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reserve

file handler