@sempervirens/endpoint
v0.9.2
Published
Middleware for handling Express routes
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Sempervirens Endpoint
Middleware for handling Express routes, it provides an organized way to register multiple Express endpoints, an extendable class for isolating endpoint functionality, standardization for sending success and error objects, and built-in authorization with minimal JWT configuration.
Installation
npm install @sempervirens/endpoint
Usage
The following steps provide minimal usage. It is recommneded to have separate files for each RequestHandler
instance, and a separate endpoints
file that imports the RequestHandler
instances and exports an array of endpoint configurations. Also, while @sempervirens/endpoint
may be used independently, or in conjunction with @sempervirens/site-loader
, implementation of both is integrated and streamlined in @sempervirens/server
.
Non-secure Endpoints
Import
express
and Nodehttp
(or use@sempervirens/server
).Import
registerEndpoints
andRequestHandler
from@sempervirens/endpoint
.Create request handlers.
Create an array of endpoint configurations.
Create an Express app.
Register the endpoints with the app.
Start the server.
import express from 'express';
import http from 'http';
import { registerEndpoints, RequestHandler } from '@sempervirens/endpoint';
// Recommended usage, in a separate file
class TestRequestHandler extends RequestHandler {
constructor({ req, res, data, isSecure }) {
super({ req, res, data, isSecure });
if (!this.isAuthorized) return;
this.#init();
}
#init() {
console.log(this.data);
// -> { prop1: 'val1' }
this.res.send('Success');
}
}
// In another separate file
const endpoints = [
{
path: 'GET /api/test',
handler: TestRequestHandler
data: { prop1: 'val1' } // Passed into RequestHandler constructor
}
];
const app = express();
registerEndpoints(app, endpoints);
http.createServer(app).listen(80, () => console.log('Listening'));
Secure Endpoints
Passing isSecure
to the endpoint configuration secures the endpoint by requiring a Authorization Bearer ${token}
header to be passed in the request. See @sempervirens/authorizer
or @sempervirens/server
for details.
Import
express
and Nodehttp
.Import
registerEndpoints
andRequestHandler
from@sempervirens/endpoint
.Import
@sempervirens/authorizer
.Initialize
authorizer
;Create request handlers.
Create a set of endpoint configurations.
Create an Express app.
Register the endpoints with the app.
Start the server.
import express from 'express';
import http from 'http';
import authorizer from '@sempervirens/authorizer';
import { registerEndpoints, RequestHandler } from '@sempervirens/endpoint';
// See @sempervirens/authorizer or @sempervirens/server for details
const jwtPublicKey = readFileSync('./security/jwt/jwtRS256.key.pub', 'utf8');
const jwtPrivateKey = readFileSync('./security/jwt/jwtRS256.key', 'utf8');
authorizer.init({ jwtPublicKey, jwtPrivateKey });
// Recommended usage, in a separate file
class TestRequestHandler extends RequestHandler {
constructor({ req, res, data, isSecure }) {
super({ req, res, data, isSecure });
if (!this.isAuthorized) return;
this.#init();
}
#init() {
this.res.send('Success');
}
}
// In another separate file
const endpoints = [
{
path: 'GET /api/test',
handler: TestRequestHandler,
isSecure: true
}
];
const app = express();
registerEndpoints(app, endpoints);
http.createServer(app).listen(80, () => console.log('Listening'));
API
registerEndpoints (single function)
| Prop | Type | Params | Description |
|-------|------|--------|-------------|
| registerEndpoints
| function | app: Express app, endpoints: { path: string, handler: RequestHandler, data: object, isSecure: boolean }
| Registers the endpoints on the Express app. |
ErrorCodes (enum)
| Prop | Type | Params | Description |
|-------|------|--------|-------------|
| SCRIPT_ERROR
| string | n/a | Default error code
for RequestHandler error()
, it sends a generic Server error
message to the client. |
| USER_ERROR
| string | n/a | When specified as the code
in RequestHandler error()
, it sends the error message given in error: new Error('Message')
to the client. |
RequestHandler (class)
| Prop | Type | Params | Description |
|-------|------|--------|-------------|
| constructor
| function | { req: Express request, res: Express response, data: {}, isSecure: boolean }
| The main entry point that is called when the Express route is invoked. If data
is given, it provides the data to all instances as this.data
, and if the RequestHandler
is of a SiteLoader
instance, both data
parameters are merged with the RequestHandler
set taking precedence if they have any of the same properties. |
| send
| function | { message: string, data: object }
| Sends a standardized response to the client with a message
and data
object. It only sends if an error has not occurred and if a message has not already been sent. |
| error
| function | { number: number, error: Error, code: ErrorCodes, suppressLog: boolean, status: number }
| Sends a standardized error
object to the client. Typically only number
and error
are needed. If code
is USER_ERROR
, then it sends the message for the given error
; otherwise, it sends a generic Server error
message. It also logs to the server console, which provides server-side logging. Status may also be specified, but usally a soft 200
with an error
object is sufficient so as not to throw a hard HTTP error in the browser console. |part