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server.js
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server.js
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require("dotenv").config();
const fs = require("fs");
const express = require("express");
const bodyParser = require("body-parser");
const cors = require("cors");
const yaml = require("js-yaml");
const helmet = require("helmet");
const Sentry = require("@sentry/node");
const { Elm } = require("./server-app");
const lib = require("./lib");
const memoize = require("fast-memoize");
const app = express(); // web app
const api = express(); // api app
const host = "0.0.0.0";
const express_port = 8001;
const django_port = 8002;
const max_memoize_age = 1000 * 60 * 24; // 24 hours memoization
// Env vars
const { SENTRY_DSN, MATOMO_HOST, MATOMO_SITE_ID, MATOMO_TOKEN } = process.env;
// Matomo
if (process.env.NODE_ENV !== "test" && (!MATOMO_HOST || !MATOMO_SITE_ID || !MATOMO_TOKEN)) {
console.error("Matomo environment variables are missing. Please check the README.");
process.exit(1);
}
// Sentry
if (SENTRY_DSN) {
Sentry.init({ dsn: SENTRY_DSN, tracesSampleRate: 0.1 });
// Note: Sentry middleware *must* be the very first applied to be effective
app.use(Sentry.Handlers.requestHandler());
}
// Web
// Note: helmet middlewares have to be called *after* the Sentry middleware
// but *before* other middlewares to be applied effectively
app.use(
helmet({
crossOriginEmbedderPolicy: false,
hsts: false,
xssFilter: false,
contentSecurityPolicy: {
useDefaults: true,
directives: {
"default-src": [
"'self'",
"https://api.github.com",
"https://raw.githubusercontent.com",
"https://sentry.incubateur.net",
"*.gouv.fr",
],
"frame-src": ["'self'", `https://${process.env.MATOMO_HOST}`, "https://www.loom.com"],
"img-src": [
"'self'",
"data:",
"blob:",
"https://avatars.githubusercontent.com/",
"https://raw.githubusercontent.com",
],
// FIXME: We should be able to remove 'unsafe-inline' as soon as the Matomo
// server sends the appropriate `Access-Control-Allow-Origin` header
// @see https://matomo.org/faq/how-to/faq_18694/
"script-src": ["'self'", "'unsafe-inline'", `https://${process.env.MATOMO_HOST}`],
"object-src": ["blob:"],
},
},
}),
);
app.use(
express.static("dist", {
setHeaders: (res) => {
// Note: helmet sets this header to `0` by default and doesn't allow overriding
// this value
res.set("X-XSS-Protection", "1; mode=block");
},
}),
);
// Redirects: Web
app.get("/accessibilite", (_, res) => res.redirect("/#/pages/accessibilité"));
app.get("/mentions-legales", (_, res) => res.redirect("/#/pages/mentions-légales"));
app.get("/stats", (_, res) => res.redirect("/#/stats"));
// API
const openApiContents = yaml.load(fs.readFileSync("openapi.yaml"));
// Matomo
const apiTracker = lib.setupTracker(openApiContents);
const elmApp = Elm.Server.init();
elmApp.ports.output.subscribe(({ status, body, jsResponseHandler }) => {
return jsResponseHandler({ status, body });
});
api.get("/", (req, res) => {
apiTracker.track(200, req);
res.status(200).send(openApiContents);
});
// Redirects: API
api.get(/^\/countries$/, (_, res) => res.redirect("textile/countries"));
api.get(/^\/materials$/, (_, res) => res.redirect("textile/materials"));
api.get(/^\/products$/, (_, res) => res.redirect("textile/products"));
const cleanRedirect = (url) => (url.startsWith("/") ? url : "");
api.get(/^\/simulator(.*)$/, ({ url }, res) => res.redirect(`/api/textile${cleanRedirect(url)}`));
const getProcesses = async (token) => {
let headers = {};
if (token) {
headers["token"] = token;
}
if (process.env.NODE_ENV == "test") {
headers["fakeDetails"] = "true";
}
const processesUrl = `http://127.0.0.1:${django_port}/processes/processes.json`;
const processesRes = await fetch(processesUrl, { headers: headers });
const processes = await processesRes.json();
return { processes: processes, status: processesRes.status };
};
const memoizedGetProcesses = memoize(getProcesses, { maxAge: max_memoize_age });
// Note: Text/JSON request body parser (JSON is decoded in Elm)
api.all(/(.*)/, bodyParser.json(), async (req, res) => {
let result;
try {
result = await memoizedGetProcesses(req.headers.token);
if (result.status != 200) {
return res.status(result.status).send(result.processes);
}
} catch (err) {
console.error(err.message);
return res.status(500).send("Error while retrieving the processes");
}
elmApp.ports.input.send({
method: req.method,
url: req.url,
body: req.body,
processes: result.processes,
jsResponseHandler: ({ status, body }) => {
apiTracker.track(status, req);
res.status(status).send(body);
},
});
});
api.use(cors()); // Enable CORS for all API requests
app.use("/api", api);
// Sentry error handler
// Note: *must* be called *before* any other error handler
if (SENTRY_DSN) {
app.use(Sentry.Handlers.errorHandler());
}
const server = app.listen(express_port, host, () => {
console.log(`Server listening at http://${host}:${express_port}`);
});
module.exports = server;