somod-http-extension/build/lib/routeBuilder.js

SOMOD middleware to intercept and validate Lambda event for AWS APIGateway

import { MIDDLEWARE_CONTEXT_KEY } from "./constants";
export class RouteBuilder {
    routes = {};
    add(route, method, routeHandler) {
        if (this.routes[route] === undefined) {
            this.routes[route] = {};
        }
        this.routes[route][method] = routeHandler;
        return this;
    }
    getHandler() {
        // eslint-disable-next-line @typescript-eslint/no-this-alias
        const that = this;
        return async (event) => {
            const request = event.somodMiddlewareContext.get(MIDDLEWARE_CONTEXT_KEY);
            const handler = that.routes[request.route]?.[request.method];
            if (handler === undefined) {
                return {
                    statusCode: 404,
                    body: JSON.stringify({
                        message: `No route handler defined for ${request.method} ${request.route}`
                    })
                };
            }
            else {
                return await handler(request, event);
            }
        };
    }
}