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Faster

A fast middleware server with an absurdly small amount of code, inspired by the koa and oak projects. It also has a collection of useful middlewares. Faster’s ideology is: all you need is an optimized middleware manager, all other functionality is middleware. The middlware manager is just 298 lines of code and is written over Deno’s native http APIs, with no dependencies.

Example

Defining routes

Static (/foo, /foo/bar)

Parameter (/:title, /books/:title, /books/:genre/:title)

Parameter w/ Suffix (/movies/:title.mp4, /movies/:title.(mp4|mov))

Optional Parameters (/:title?, /books/:title?, /books/:genre/:title?)

Wildcards (*, /books/*, /books/:genre/*)

POST, read and return JSON:

import { req, res, Server } from "https://deno.land/x/faster/mod.ts";
const server = new Server();
server.post(
  "/upload",
  res("json"),
  req("json"),
  async (ctx: any, next: any) => {
    console.log(ctx.body);
    ctx.res.body = { msg: "json response example" };
    await next();
  },
);
await server.listen({ port: 80 });

GET, return html:

server.get(
  "/example_html",
  res("html"),
  async (ctx: any, next: any) => {
    ctx.res.body = `
      <!DOCTYPE html>
      <html>
        <head>
          <meta charset="utf-8">
          <title>title example</title>
        </head>
        </body>
          HTML body example
        <body>
      </html>
    `;
    await next();
  },
);

Get url params:

server.get(
  "/example_params/:ex1?foo=bar",
  async (ctx: any, next: any) => {
    console.log(ctx.params.ex1);
    console.log(ctx.url.searchParams.get("foo")); //you can explore the URL (ctx.url) object
    await next();
  },
);

Cookies:

import {
  Cookie,
  deleteCookie,
  getCookies,
  Server,
  setCookie,
} from "https://deno.land/x/faster/mod.ts"; //alias to deno std
server.get(
  "/cookies",
  async (ctx: any, next: any) => {
    setCookie(ctx.res.headers, { name: "user_name", value: "San" }); //explore interface 'Cookie' for more options
    deleteCookie(ctx.res.headers, "last_order");
    console.log(getCookies(ctx.req.headers));
    await next();
  },
);

Redirect:

server.get(
  "/redirect_example",
  async (ctx: any, next: any) => {
    ctx.redirect("/my_custom_url_or_path");
    await next();
  },
);

Middleares

This project has a standard set of middleware useful for most cases.

Logger

Example:

server.use(logger());

You can pass custom log file:

logger("./my_dir/my_custom_log.txt");

Parsers (“res” and “req”)

Example:

server.post(
  "/example_parsers",
  res("json"),
  req("json"),
  async (ctx: any, next: any) => {
    console.log(ctx.body); //the original (no parser) body is in ctx.req.body
    ctx.res.body = { msg: "json response example" };
    await next();
  },
);

The current supported options for “req” are: “arrayBuffer”, “blob”, “formData”, “json”, “text”.

The current supported options for “res” are: “json”, “html”, “javascript”.

If there are no parsers for your data, don’t worry, you can handle the data manually, Ex:

server.post(
  "/upload",
  async (ctx: any, next: any) => {
    ctx.res.headers.append(
      "Content-Type",
      "application/json",
    );
    const data = await exCustomParseBody(ctx.req.body); //do what you want with ctx.req.body
    ctx.res.body = JSON.stringify({ msg: "ok" });
    await next();
  },
);

Rate Limit

Example:

server.use(rateLimit());

With custom options:

rateLimit({ attempts: 30, interval: 10, maxTableSize: 100000 });

Serve Static

Example (must end with “/*”):

server.get(
  "/pub/*",
  serveStatic("./pub"),
);

Set Cors

Example:

server.options("/example_cors", setCORS()); //enable pre-fligh request
server.get(
  "/example_cors",
  setCORS(),
  async (ctx, next) => {
    await next();
  },
);

You can pass valid hosts to cors function:

setCORS("http://my.custom.url:8080");

Token

This middleware is encapsulated in an entire static class. It uses Bearer Token and default options with the “HS256” algorithm, and generates a random secret when starting the application (you can also set a secret manually). Ex:

server.get(
  "/example_verify_token", //send token to server in Header => Authorization: Bearer TOKEN
  Token.middleware,
  async (ctx, next) => {
    console.log(ctx.extra.tokenPayload);
    console.log(ctx.extra.token);
    await next();
  },
);

Generate Token ex:

await Token.generate({ user_id: "172746" }, null); //null to never expire, this parameter defaults to "1h"

Set secret ex:

Token.setSecret("a3d2r366wgb3dh6yrwzw99kzx2"); //Do this at the beginning of your application

Get token payload out of middleware:

await Token.getPayload("YOUR_TOKEN_STRING"); //Do this at the beginning of your application

Redirect

Ex:

server.get(
  "/my_url_1",
  redirect("/my_url_2"), //or the full url
);

Upload

This middleware automatically organizes uploads to avoid file system problems and create dirs if not exists, perform validations and optimizes ram usage when uploading large files using Deno standard libraries!

Usage:

Ex:

.post("/upload", upload(), async (ctx: any, next: any) => { ...

Ex (with custom options):

.post("/upload", upload({ path: 'uploads_custom_dir' , extensions: ['jpg', 'png'], maxSizeBytes: 20000000, maxFileSizeBytes: 10000000, saveFile: true, readFile: false, useCurrentDir: true }), async (ctx: any, next: any) => { ...

Uploads will be in ctx.extra.uploadedFiles;

upload(

path: storage directory.

extensions: optional ex: [‘jpg’, ‘png’], default allow all - [].

maxSizeBytes: optional, max total size in bytes for all files in form, default unlimited - Number.MAX_SAFE_INTEGER.

maxFileSizeBytes: optional, max size in bytes for each file in form, default unlimited - Number.MAX_SAFE_INTEGER.

saveFile: optional, if false the file will not be saved in the file system, and a temporary file generated by Deno std will returned in ‘tempfile’ field, default true. You can use it as an option to save the file in a custom way, like in a database.

readFile: optional, if true the file will be fully loaded on the ram and a Uint8Array will be returned in the ‘data’ field, default false.

useCurrentDir: optional, if true the path is relative to current Deno working directory, default true.

), next middlewares …

Request must contains a body with form type “multipart/form-data”, and inputs with type=”file”.

Ex:

.post("/pre_upload", preUploadValidate(["jpg", "png"], 20000000, 10000000), async (ctx: any, next: any) => { ...

preUploadValidate(

extensions: optional ex: [‘jpg’, ‘png’], default allow all - [],

maxSizeBytes: optional, max total size in bytes for all files in form, default unlimited - Number.MAX_SAFE_INTEGER,

maxFileSizeBytes: optional, max size in bytes for each file in form, default unlimited - Number.MAX_SAFE_INTEGER

), next middlewares …

This middleware does a pre-validation before sending the form, for optimizations. To use it, send a JSON containing the objects “file”.

Examples:

Below an example to work with AJAX, also accepting type=”file” multiple:

var files = document.querySelector("#yourFormId input[type=file]").files;
var name = document.querySelector("#yourFormId input[type=file]").getAttribute(
  "name",
);

var form = new FormData();
for (var i = 0; i < files.length; i++) {
  form.append(`${name}_${i}`, files[i]);
}
var res = await fetch("/upload", { //Fetch API automatically puts the form in the format "multipart/form-data".
  method: "POST",
  body: form,
}).then((response) => response.json());
console.log(res);

//VALIDATIONS --------------

var validationData = {};
for (var i = 0; i < files.length; i++) {
  var newObj = { //newObj is needed, JSON.stringify(files[i]) not work
    "name": files[i].name,
    "size": files[i].size,
  };
  validationData[`${name}_${i}`] = newObj;
}
var validations = await fetch("/pre_upload", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify(validationData),
}).then((response) => response.json());
console.log(validations);

In Deno:

import {
  preUploadValidate,
  res,
  Server,
  upload,
} from "https://deno.land/x/faster/mod.ts";
const server = new Server();
server.post(
  "/upload",
  res("json"),
  upload({
    path: "my_uploads",
    extensions: ["jpg", "png"],
    maxSizeBytes: 20000000,
    maxFileSizeBytes: 10000000,
  }),
  async (ctx: any, next: any) => {
    ctx.res.body = ctx.extra.uploadedFiles;
    await next();
  },
);
server.post(
  "/pre_upload",
  res("json"),
  preUploadValidate(["jpg", "png"], 20000000, 10000000),
  async (ctx: any, next: any) => {
    ctx.res.body = { msg: "Passed upload validations." };
    await next();
  },
);
server.get("/", res("html"), async (ctx: any, next: any) => {
  ctx.res.body = `
  <form id="yourFormId" enctype="multipart/form-data" action="/upload" method="post">
    <input type="file" name="file1" multiple><br>
    <input type="submit" value="Submit">
  </form>
    `;
  await next();
});
await server.listen({ port: 80 });

All imports:

import {
  Context,
  Cookie, //type, alias to deno std
  deleteCookie, //alias to deno std
  getCookies, //alias to deno std
  logger,
  NextFunc, //type
  Params, //type
  parse,
  preUploadValidate,
  ProcessorFunc, //type
  rateLimit,
  redirect,
  req,
  res,
  Route, //type
  RouteFn, //type
  Server,
  serveStatic,
  setCookie, //alias to deno std
  setCORS,
  Token,
  upload,
} from "https://deno.land/x/faster/mod.ts";

Example Deploy

Example of depoly application “my-deno-app” in ubuntu environment. Change the “my-deno-app” and the directories to yours.

Create service

Create run script (“run-server.sh”) in your application folder with the content:

#!/bin/bash
/home/ubuntu/.deno/bin/deno run --allow-net --allow-read --allow-write /home/ubuntu/my-deno-app/app.ts

Give permission to the script:

chmod +x run-server.sh

Create service files:

sudo touch /etc/systemd/system/my-deno-app.service
sudo nano /etc/systemd/system/my-deno-app.service

In “my-deno-app”.service (change the “Description”, “WorkingDirectory” and “ExecStart” to yours):

[Unit]
Description=My Deno App

[Service]
WorkingDirectory=/home/ubuntu/my-deno-app
ExecStart=/home/ubuntu/my-deno-app/run-server.sh
TimeoutSec=30
Restart=always
RestartSec=1

[Install]
WantedBy=multi-user.target

If your application needs to wait for another service to start, such as the mongodb database, you can use the ´[Unit]´ section like this:

[Unit]
Description=My Deno App
After=mongod.service

Enable the “my-deno-app” service:

sudo systemctl enable my-deno-app.service

To start and stop the “my-deno-app” service:

sudo service my-deno-app stop
sudo service my-deno-app start

See log:

journalctl -u my-deno-app.service --since=today -e

Configure https

Install certbot:

sudo apt install certbot

Generate certificates:

sudo certbot certonly --manual

In your application, to verify the domain you will need something like:

import { Server, serveStatic } from "https://deno.land/x/faster/mod.ts";
const server = new Server();
server.get( //verify http://<YOUR_DOMAIN>/.well-known/acme-challenge/<TOKEN>
  "/.well-known/*",
  serveStatic("./.well-known"), // ex: create .well-known folder in yor app folder
);
await server.listen({ port: 80 });

To run your application on https (Change “yourdomain.link” to your domain):

await server.listen({
  port: 443,
  certFile: "/etc/letsencrypt/live/yourdomain.link/fullchain.pem",
  keyFile: "/etc/letsencrypt/live/yourdomain.link/privkey.pem",
});

The certificate is valid for a short period. Set crontab to update automatically. The command ‘sudo crontab’ opens roots crontab, all commands are executed as sudo. Do like this:

sudo crontab -e

Add to the end of the file (to check and renew if necessary every 12 hours):

0 */12 * * * certbot -q renew

Or also to check every 7 days:

0 0 * * 0 certbot -q renew

About

Author: Henrique Emanoel Viana, a Brazilian computer scientist, enthusiast of web technologies, cel: +55 (41) 99999-4664. URL: https://sites.google.com/site/henriqueemanoelviana

Improvements and suggestions are welcome!