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woodland

Lightweight HTTP router with automatic headers

  • 16.1.3
  • Source
  • npm
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383
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woodland

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Lightweight HTTP router with automatic headers. Routes can use parameter syntax, i.e. /users/:id, or RegExp syntax. Route parameters are not sanitized. If 2+ routes with parameters match a request the first route will be used to extract parameters. All HTTP methods are supported.

CORS (Cross Origin Resource Sharing) is automatically handled, and indicated with cors Boolean on the request Object for middleware.

Middleware arguments can be req, res, next or error, req, res, next. If no Error handling middleware is registered woodland will handle it.

"use strict";

const http = require("http"),
	router = require("woodland")({defaultHeaders: {"cache-control": "public, max-age=3600", "content-type": "text/plain"}, time: true});

router.get("/", (req, res) => res.send("Custom greeting at '/:user', try it out!"));
router.get("/:user", (req, res) => res.send(`Hello ${req.params.user}!`));
http.createServer(router.route).listen(8000);

API

woodland ({...})

Returns a woodland router. Enable directory browsing & traversal with autoindex. Create an automatic x-response-time response header with time & digit. Customize etag response header with seed.

See configuration options below.

allowed (method, uri, override = false)

Calls routes() and returns a Boolean to indicate if method is allowed for uri.

allows (uri, override = false)

Returns a String for the Allow header. Caches value, & will update cache if override is true.

always (path, fn)

Registers middleware for a route for all HTTP methods; runs first. path is a regular expression (as a string), and if not passed it defaults to /.*.

Execute ignore(fn) if you do not want the middleware included for calculating the Allow header.

ignore (fn)

Ignores fn for calculating the return of allows().

decorate (req, res)

Decorates allow, body, cors, host, ip, params, & parsed on req and error(status[, body, headers]), header(key, value), json(body[, status, headers]), locals{} & redirect(url[, perm = false]) on res.

etag (...args)

Returns a String to be used as an ETag response header value.

list (method = "get", type = "array")

Returns an Array or Object of routes for the specified method.

log (msg = "", level = "debug")

Logs to stdout or stderr depending on the level, & what the minimum log level is set to.

onsend (req, res, body, status, headers)

Override to customize response body, status, or headers. Must return [body, status, headers]!

route (req, res)

Function for http.createServer() or https.createServer().

routes (uri, method, override = false)

Returns an Array of middleware for the request. Caches value, & will update cache if override is true.

serve (req, res, localFilePath, folderPath, indexes = this.indexes)

Serve static files on disk. Use a route parameter or remove folderPath from req.parsed.pathname to create localFilePath.

Without autoindex
router.use("/files/:file", (req, res) => router.serve(req, res, req.params.file, path.join(__dirname, "files")));
With autoindex
router.use("/files(/.*)?", (req, res) => router.serve(req, res, req.parsed.pathname.replace(/^\/files\/?/, ""), join(__dirname, "files")));
use ([path = "/.*",] ...fn[, method = "GET"])

Registers middleware for a route. path is a regular expression (as a string), and if not passed it defaults to /.*. See always() if you want the middleware to be used for all HTTP methods.

All HTTP methods are available on the prototype (partial application of the third argument), e.g. get([path,] ...fn) & options([path,] ...fn).

Benchmark

Please benchmark woodland on your target hardware to understand the overhead; expected to be 15-20%, e.g. if http can handle 50k req/s, then woodland should handle >= 40k req/s.

  1. Clone repository from GitHub.
  2. Install dependencies with npm or yarn.
  3. Execute benchmark script with npm or yarn.

Command Line Interface (CLI)

When woodland is installed as a global module you can serve the contents of a folder by executing woodland in a shell. Optional parameters are --ip=127.0.0.1 & --port=8000.

Configuration

{
  "autoindex": false,
  "cacheSize": 1000,
  "cacheTTL": 300000,
  "charset": "utf-8",
  "corsExpose": "",
  "defaultHeaders": {},
  "digit": 3,
  "etags": true,
  "indexes": [
    "index.htm",
    "index.html"
  ],
  "logging": {
    "enabled": true,
    "format": "%h %l %u %t \"%r\" %>s %b",
    "level": "info"
  },
  "origins": [
    "*"
  ],
  "seed": 42,
  "sendError": false,
  "time": false
}

Event Handlers

Event Emitter syntax for the following events:

router.on("connect", (req, res) => res.header("x-custom-header", "abc-def"));
connect (req, res)

Executes after the connection has been decorated, but before the middleware executes.

error (req, res, err)

Executes after the response has been sent.

finish (req, res)

Executes after the response has been sent.

Helpers

req & res are decorated with helper functions to simplify responding.

res.error (status[, body, headers])

Sends an error response.

res.header (key, value)

Shorthand of res.setHeader().

res.json (body, [status = 200, headers])

Sends a JSON response.

res.last (req, res, next)

Last middleware of the route for the HTTP method as a way to "skip" to the middleware which sends a response.

res.redirect (uri[, perm = false])

Sends a redirection response.

res.send (body, [status = 200, headers = {}])

Sends a response. Range header is ignored on stream responses.

res.status (arg)

Sets the response statusCode property & status.

Logging

Woodland defaults to Common Log Format but supports Common Log Format with Virtual Host, & NCSA extended/combined log format with an info level by default. You can change the stdout output by changing logging.format with valid placeholders.

You can disable woodland's logging by configuration with {logging: {enabled: false}}.

Testing Code Coverage

Run the coverage script with npm or yarn. Coverage test gaps are Error handling edge cases within serve() & use().

---------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------
File           | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
---------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------
All files      |   91.67 |    72.61 |   95.38 |   91.92 |                                                                                    
 woodland      |     100 |      100 |     100 |     100 |                                                                                    
  index.js     |     100 |      100 |     100 |     100 |                                                                                    
 woodland/lib  |   91.54 |    72.61 |   95.31 |   91.79 |                                                                                    
  constants.js |     100 |      100 |     100 |     100 |                                                                                    
  utility.js   |   92.44 |    71.32 |     100 |   92.31 | 34,161-163,178-179,181,185,203                                                     
  woodland.js  |   91.01 |    73.28 |   92.86 |   91.42 | 142,154-155,173-174,229-230,235,244,275-279,294,301,411,425,434-435,442,448,478,482
---------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------

License

Copyright (c) 2021 Jason Mulligan

Licensed under the BSD-3 license.

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Package last updated on 04 Jan 2021

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