/*
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Code to serve the web app in PRODUCTION.
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Injects environment variables at runtime in build/index.html
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*/
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require("dotenv").config();
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const express = require("express");
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const path = require("path");
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const fs = require("fs").promises;
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const app = express();
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const BUILD_PATH = path.join(__dirname, "build");
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app.use(express.static(BUILD_PATH));
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// Return index.html, with injected env variables
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const indexFilePath = path.join(__dirname, "build", "index.html");
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app.get("/*", async(request, response) => {
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log(request);
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const content = await injectEnvironmentInHTml(indexFilePath);
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response.send(content);
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});
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const PORT = process.env.PORT || 8080;
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app.listen(PORT, () => {
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console.log(`Server listening at ${PORT}`);
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});
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function log(req) {
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console.log(`${(new Date()).toISOString()} - GET ${req.url}`);
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}
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async function injectEnvironmentInHTml(filePath) {
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// Only consider variables starting with REACT_APP
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const environment = {};
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Object.keys(process.env)
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.filter(key => key.startsWith("REACT_APP_"))
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.forEach(key => {
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environment[key] = process.env[key];
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});
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const content = await fs.readFile(filePath);
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return content
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.toString()
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.replace(
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"__PRODUCTION_ENV__",
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JSON.stringify(environment)
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);
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}
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