infra-as-typescript-3awscloud.ts

import * as aws from "@pulumi/cloud-aws";

// Create a table `urls`, with `name` as primary key.
let urlTable = new aws.Table("urls", "name");

// Create a web server.
let endpoint = new aws.API("urlshortener");

// Serve all files in the www directory to the root.
endpoint.static("/", "www");

// GET /url/{name} redirects to the target URL based on a short-name.
endpoint.get("/url/{name}", async (req, res) => {
    let name = req.params["name"];
    let value = await urlTable.get({name});
    let url = value && value.url;

    // If we found an entry, 301 redirect to it; else, 404.
    if (url) {
        res.setHeader("Location", url);
        res.status(301);
        res.end("");
    }
    else {
        res.status(404);
        res.end("");
    }
});

// POST /url registers a new URL with a given short-name.
endpoint.post("/url", async (req, res) => {
    let url = req.query["url"];
    let name = req.query["name"];
    await urlTable.insert({ name, url });
    res.json({ shortenedURLName: name });
});

export let endpointUrl = endpoint.publish().url;