middy-middleware-jwt-auth

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middy-middleware-jwt-auth

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A Middy middleware for authentication via JSON web tokens

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# middy-middleware-jwt-auth

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A [middy](https://github.com/middyjs/middy) JSON web token authorization middleware inspired by express-jwt.

## Installation

Download node at [nodejs.org](http://nodejs.org) and install it, if you haven't already.

```sh
npm install middy-middleware-jwt-auth --save
```

## Documentation

There is [additional documentation](https://dbartholomae.github.io/middy-middleware-jwt-auth/).

## Usage

```typescript
import createHttpError from "http-errors";
import middy from "@middy/core";
import httpErrorHandler from "@middy/http-error-handler";
import httpHeaderNormalizer from "@middy/http-header-normalizer";
import JWTAuthMiddleware, {
  EncryptionAlgorithms,
  IAuthorizedEvent,
} from "middy-middleware-jwt-auth";

// Optionally define the token payload you expect to receive
interface ITokenPayload {
  permissions: string[];
}

// Optionally define a type guard for the token payload
function isTokenPayload(token: any): token is ITokenPayload {
  return (
    token != null &&
    Array.isArray(token.permissions) &&
    token.permissions.every((permission: any) => typeof permission === "string")
  );
}

// This is your AWS handler
const helloWorld = async (event: IAuthorizedEvent<ITokenPayload>) => {
  // The middleware adds auth information if a valid token was added
  // If no auth was found and credentialsRequired is set to true, a 401 will be thrown. If auth exists you
  // have to check that it has the expected form.
  if (event.auth!.payload.permissions.indexOf("helloWorld") === -1) {
    throw createHttpError(
      403,
      `User not authorized for helloWorld, only found permissions [${event.auth!.permissions.join(", ")}]`,
      {
        type: "NotAuthorized",
      },
    );
  }

return {
    body: JSON.stringify({
      data: `Hello world! Here's your token: ${event.auth!.token}`,
    }),
    statusCode: 200,
  };
};

// Let's "middyfy" our handler, then we will be able to attach middlewares to it
export const handler = middy(helloWorld)
  .use(httpHeaderNormalizer()) // Make sure authorization header is saved in lower case
  .use(httpErrorHandler()) // This middleware is needed do handle the errors thrown by the JWTAuthMiddleware
  .use(
    JWTAuthMiddleware({
      /** Algorithm to verify JSON web token signature */
      algorithm: EncryptionAlgorithms.HS256,
      /** An optional boolean that enables making authorization mandatory */
      credentialsRequired: true,
      /** An optional function that checks whether the token payload is formatted correctly */
      isPayload: isTokenPayload,
      /** A string or buffer containing either the secret for HMAC algorithms, or the PEM encoded public key for RSA and ECDSA */
      secretOrPublicKey: "secret",
      /**
       * An optional function used to search for a token e. g. in a query string. By default, and as a fall back,
       * event.headers.authorization and event.headers.Authorization are used.
       */
      tokenSource: (event: any) => event.queryStringParameters.token,
    }),
  );
```

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