avoidworkTenso
Tenso is an HTTP REST API framework, that will handle the serialization & creation of hypermedia links; all you have to do is give it Arrays or Objects.
Example
Creating an API with Tenso can be this simple:
import {tenso} from "tenso";
export const app = tenso();
app.get("/", "Hello, World!");
app.start();
Creating Routes
Routes are loaded as a module, with each HTTP method as an export, affording a very customizable API server.
You can use res to res.send(body[, status, headers]), res.redirect(url), or res.error(status[, Error]).
The following example will create GET routes that will return an Array at /, an Error at /reports/tps, & a version 4 UUID at /uuid.
As of 10.3.0 you can specify always as a method to run middleware before authorization middleware, which will skip always middleware registered after it (via instance methods).
As of 17.2.0 you can have routes exit the middleware pipeline immediately by setting them in the exit Array. This differs from unprotect as there is no request body handling.
Example
Routes
import {randomUUID as uuid} from "crypto";
export const initRoutes = {
"get": {
"/": ["reports", "uuid"],
"/reports": ["tps"],
"/reports/tps": (req, res) => res.error(785, Error("TPS Cover Sheet not attached")),
"/uuid": (req, res) => res.send(uuid(), 200, {"cache-control": "no-cache"})
}
};
Server
import {tenso} from "tenso";
import {initRoutes} from "./routes";
export const app = tenso({initRoutes});
app.start();
Protected Routes
Protected routes are routes that require authorization for access, and will redirect to authentication end points if needed.
Unprotected Routes
Unprotected routes are routes that do not require authorization for access, and will exit the authorization pipeline early to avoid rate limiting, csrf tokens, & other security measures. These routes are the DMZ of your API! You must secure these end points with alternative methods if accepting input!
Reserved Route
The /assets/* route is reserved for the HTML browsable interface assets; please do not try to reuse this for data.
Request Helpers
Tenso decorates req with "helpers" such as req.allow, req.csrf, req.ip, req.parsed, & req.private. PATCH, PUT, & POST payloads are available as req.body. Sessions are available as req.session when using local authentication.
Tenso decorates res with "helpers" such as res.send(), res.status(), & res.json().
Extensibility
Tenso is extensible, and can be customized with custom parsers, renderers, & serializers.
Parsers
Custom parsers can be registered with server.parser('mimetype', fn); or directly on server.parsers. The parameters for a parser are (arg).
Tenso has parsers for:
application/jsonapplication/x-www-form-urlencodedapplication/jsonlapplication/json-linestext/json-lines
Renderers
Custom renderers can be registered with server.renderer('mimetype', fn);. The parameters for a renderer are (req, res, arg).
Tenso has renderers for:
application/javascriptapplication/jsonapplication/jsonlapplication/json-linestext/json-linesapplication/yamlapplication/xmltext/csvtext/html
Serializers
Custom serializers can be registered with server.serializer('mimetype', fn);. The parameters for a serializer are (arg, err, status = 200, stack = false).
Tenso has two default serializers which can be overridden:
plainfor plain text responsescustomfor standard response shape
{
"data": "`null` or ?",
"error": "`null` or an `Error` stack trace / message",
"links": [],
"status": 200
}
Responses
Responses will have a standard shape, and will be utf-8 by default. The result will be in data. Hypermedia (pagination & links) will be in links:[ {"uri": "...", "rel": "..."}, ...], & also in the Link HTTP header.
Page size can be specified via the page_size parameter, e.g. ?page_size=25.
Sort order can be specified via then order-by which accepts [field ]asc|desc & can be combined like an SQL 'ORDER BY', e.g. ?order_by=desc or ?order_by=lastName%20asc&order_by=firstName%20asc&order_by=age%20desc
REST / Hypermedia
Hypermedia is a prerequisite of REST, and is best described by the Richardson Maturity Model. Tenso will automagically paginate Arrays of results, or parse Entity representations for keys that imply
relationships, and create the appropriate Objects in the link Array, as well as the Link HTTP header. Object keys that match this pattern: /_(guid|uuid|id|uri|url)$/ will be considered
hypermedia links.
For example, if the key user_id was found, it would be mapped to /users/:id with a link rel of related.
Tenso will bend the rules of REST when using authentication strategies provided by passport.js, or CSRF if is enabled, because they rely on a session. Session storage is in memory, or Redis. You have the option of a stateless or stateful API.
Hypermedia processing of the response body can be disabled as of 10.2.0, by setting req.hypermedia = false and/or req.hypermediaHeader via middleware.
Configuration
This is the default configuration for Tenso, without authentication or SSL. This would be ideal for development, but not production! Enabling SSL is as easy as providing file paths for the two keys.
Everything is optional! You can provide as much, or as little configuration as you like.
{
auth: {
delay: 0,
protect: [],
unprotect: [],
basic: {
enabled: false,
list: []
},
bearer: {
enabled: false,
tokens: []
},
jwt: {
enabled: false,
auth: null,
audience: EMPTY,
algorithms: [
"HS256",
"HS384",
"HS512"
],
ignoreExpiration: false,
issuer: "",
scheme: "bearer",
secretOrKey: ""
},
msg: {
login: "POST 'username' & 'password' to authenticate"
},
oauth2: {
enabled: false,
auth: null,
auth_url: "",
token_url: "",
client_id: "",
client_secret: ""
},
uri: {
login: "/auth/login",
logout: "/auth/logout",
redirect: "/",
root: "/auth"
},
saml: {
enabled: false,
auth: null
}
},
autoindex: false,
cacheSize: 1000,
cacheTTL: 300000,
catchAll: true,
charset: "utf-8",
corsExpose: "cache-control, content-language, content-type, expires, last-modified, pragma",
defaultHeaders: {
"content-type": "application/json; charset=utf-8",
"vary": "accept, accept-encoding, accept-language, origin"
},
digit: 3,
etags: true,
exit: [],
host: "0.0.0.0",
hypermedia: {
enabled: true,
header: true
},
index: [],
initRoutes: {},
jsonIndent: 0,
logging: {
enabled: true,
format: "%h %l %u %t \"%r\" %>s %b",
level: "debug",
stack: true
},
maxBytes: 0,
mimeType: "application/json",
origins: ["*"],
pageSize: 5,
port: 8000,
prometheus: {
enabled: false,
metrics: {
includeMethod: true,
includePath: true,
includeStatusCode: true,
includeUp: true,
buckets: [0.001, 0.01, 0.1, 1, 2, 3, 5, 7, 10, 15, 20, 25, 30, 35, 40, 50, 70, 100, 200],
customLabels: {}
}
},
rate: {
enabled: false,
limit: 450,
message: "Too many requests",
override: null,
reset: 900,
status: 429
},
renderHeaders: true,
time: true,
security: {
key: "x-csrf-token",
secret: "",
csrf: true,
csp: null,
xframe: "",
p3p: "",
hsts: null,
xssProtection: true,
nosniff: true
},
session: {
cookie: {
httpOnly: true,
path: "/",
sameSite: true,
secure: "auto"
},
name: "tenso.sid",
proxy: true,
redis: {
host: "127.0.0.1",
port: 6379
},
rolling: true,
resave: true,
saveUninitialized: true,
secret: "tensoABC",
store: "memory"
},
silent: false,
ssl: {
cert: null,
key: null,
pfx: null
},
webroot: {
root: "process.cwd()/www",
static: "/assets",
template: "template.html"
}
}
Authentication
The protect Array is the endpoints that will require authentication. The redirect String is the end point users will be redirected to upon successfully authenticating, the default is /.
Sessions are used for non Basic or Bearer Token authentication, and will have /login, /logout, & custom routes. Redis is supported for session storage.
Multiple authentication strategies can be enabled at once.
Authentication attempts have a random delay to deal with "timing attacks"; always rate limit in production environment!
Basic Auth
{
"auth": {
"basic": {
"enabled": true,
"list": ["username:password", ...],
},
"protect": ["/"]
}
}
JSON Web Token
JSON Web Token (JWT) authentication is stateless and does not have an entry point. The auth(token, callback) function must verify token.sub, and must execute callback(err, user).
This authentication strategy relies on out-of-band information for the secret, and other optional token attributes.
{
"auth": {
"jwt": {
"enabled": true,
"auth": function (token, cb) { ... }, /* Authentication handler, to 'find' or 'create' a User */
"algorithms": [], /* Optional signing algorithms, defaults to ["HS256", "HS384", "HS512"] */
"audience": "", /* Optional, used to verify `aud` */
"issuer: "", /* Optional, used to verify `iss` */
"ignoreExpiration": false, /* Optional, set to `true` to ignore expired tokens */
"scheme": "Bearer", /* Optional, set to specify the `Authorization` scheme */
"secretOrKey": ""
}
"protect": ["/private"]
}
}
OAuth2
OAuth2 authentication will create /auth, /auth/oauth2, & /auth/oauth2/callback routes. auth(accessToken, refreshToken, profile, callback) must execute callback(err, user).
{
"auth": {
"oauth2": {
"enabled": true,
"auth": function ( ... ) { ... }, /* Authentication handler, to 'find' or 'create' a User */
"auth_url": "", /* Authorization URL */
"token_url": "", /* Token URL */
"client_id": "", /* Get this from authorization server */
"client_secret": "" /* Get this from authorization server */
},
"protect": ["/private"]
}
}
Oauth2 Bearer Token
{
"auth": {
"bearer": {
"enabled": true,
"tokens": ["abc", ...]
},
"protect": ["/"]
}
}
SAML
SAML authentication will create /auth, /auth/saml, & /auth/saml/callback routes. auth(profile, callback) must execute callback(err, user).
Tenso uses passport-saml, for configuration options please visit it's homepage.
{
"auth": {
"saml": {
"enabled": true,
...
},
"protect": ["/private"]
}
}
Sessions
Sessions can use a memory (default) or redis store. Memory will limit your sessions to a single server instance, while redis will allow you to share sessions across a cluster of processes, or machines. To use redis, set the store property to "redis".
If the session secret is not provided, a version 4 UUID will be used.
{
"session" : {
cookie: {
httpOnly: true,
path: "/",
sameSite: true,
secure: false
},
name: "tenso.sid",
proxy: true,
redis: {
host: "127.0.0.1",
port: 6379
},
rolling: true,
resave: true,
saveUninitialized: true,
secret: "tensoABC",
store: "memory"
}
}
Security
Tenso uses lusca for security as a middleware. Please see it's documentation for how to configure it; each method & argument is a key:value pair for security.
{
"security": { ... }
}
Rate Limiting
Rate limiting is controlled by configuration, and is disabled by default. Rate limiting is based on token, session, or ip, depending upon authentication method.
Rate limiting can be overridden by providing an override function that takes req & rate, and must return (a modified) rate.
{
"rate": {
"enabled": true,
"limit": 450, /* Maximum requests allowed before `reset` */
"reset": 900, /* TTL in seconds */
"status": 429, /* Optional HTTP status */
"message": "Too many requests", /* Optional error message */
"override": function ( req, rate ) { ... } /* Override the default rate limiting */
}
}
Limiting upload size
A 'max byte' limit can be enforced on all routes that handle PATCH, POST, & PUT requests. The default limit is 20 KB (20480 B).
{
"maxBytes": 5242880
}
Logging
Standard log levels are supported, and are emitted to stdout & stderr. Stack traces can be enabled.
{
"logging": {
"level": "warn",
"enabled": true,
"stack": true
}
}
HTML Renderer
The HTML template can be overridden with a custom HTML document.
Dark mode is supported! The dark class will be added to the body tag if the user's browser is in dark mode.
webroot: {
root: "full path",
static: "folder to serve static assets",
template: "html template"
}
Serving files
Custom file routes can be created like this:
app.files("/folder", "/full/path/to/parent");
EventSource streams
Create & cache an EventSource stream to send messages to a Client. See tiny-eventsource for configuration options:
const streams = new Map();
...
"/stream": (req, res) => {
const id = req.user.userId;
if (streams.has(id) === false) {
streams.set(id, req.server.eventsource({ms: 3e4), "initialized");
}
streams.get(id).init(req, res);
}
...
// Send data to Clients
streams.get(id).send({...});
Prometheus
Prometheus metrics can be enabled by setting {prometheus: {enabled: true}}. The metrics will be available at /metrics.
Testing
Tenso has ~80% code coverage with its tests. Test coverage will be added in the future.
-----------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-----------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------
All files | 78.15 | 54.93 | 68.75 | 78.58 |
tenso.cjs | 78.15 | 54.93 | 68.75 | 78.58 | ...85,1094,1102,1104,1115-1118,1139,1149-1175,1196-1200,1243-1251,1297-1298,1325-1365,1370,1398-1406,1412-1413,1425,1455-1456
-----------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------
Benchmark
- Clone repository from GitHub.
- Install dependencies with
npmoryarn. - Execute
benchmarkscript withnpmoryarn.
License
Copyright (c) 2024 Jason Mulligan
Licensed under the BSD-3-Clause license.