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index.js
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index.js
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const express = require("express");
const http = require("http");
const https = require("https");
const app = express();
const fs = require("fs");
const path = require("path");
const escapeHTML = require("escape-html");
let httpPort = 80;
const htmlTop = `<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<link href="/css/main.css" rel="stylesheet" media="screen" type="text/css">
<title>MDN Code Samples</title>
</head>
<body>
<div class="page-wrapper">
<div class="mdn-header">
<h1>
MDN Code Samples
</h1>
</div>
<div class="mdn-content">
<p>
This site hosts <a href="https://github.com/mdn/samples-server/"> code samples</a>
for MDN Web Docs that require server assistance to operate, such as examples for WebSocket,
WebRTC, and other APIs.
</p>
</div>
<div class="mdn-filelist">
`;
const htmlBottom = `</div>
<div class="mdn-footer">
All text content on MDN is offered under the
<a href="http://creativecommons.org/licenses/by-sa/2.5/">CC-SA-BY</a> license,
version 2.5 or later. All sample code offered on this site is provided under the
<a href="https://creativecommons.org/publicdomain/zero/1.0/">CC0 (Public
Domain)</a> license and may be reused or repurposed without attribution.
</div>
</div>
</body>
</html>`;
app.get("/", (request, response) => {
let menuHTML = buildMenu("s");
let html = htmlTop + "\r" + menuHTML + "\r" + htmlBottom;
response.send(html);
});
app.use("/s", express.static(path.join(__dirname, "s")));
app.use("/css", express.static(path.join(__dirname, "css")));
// Try to load the key and certificate for HTTPS
let httpsOptions = {};
try {
httpsOptions.key = fs.readFileSync("/etc/pki/tls/private/mdn-samples.mozilla.org.key");
httpsOptions.cert = fs.readFileSync("/etc/pki/tls/certs/mdn-samples.mozilla.org.crt");
} catch(err) {
console.error("Unable to load HTTPS cert and/or key; available on HTTP only: " + err);
httpsOptions = null;
}
let httpServer = http.createServer(app);
httpServer.listen(httpPort);
httpServer.on("error", (err) => {
if (err.code === "EADDRINUSE") {
httpPort = 8888;
httpServer = http.createServer(app);
httpServer.listen(httpPort);
console.log("Listening on port " + httpPort);
} else {
console.error("HTTP startup error: " + err);
}
});
if (httpsOptions) {
let httpServer = https.createServer(httpsOptions, app);
httpServer.listen(443);
console.log("HTTPS listening on port 443");
}
function readJSONFile(pathname) {
const options = {
encoding: "utf8"
};
try {
let data = fs.readFileSync(pathname, options);
const obj = JSON.parse(data);
return obj;
} catch(err) {
console.error(`Error loading JSON data for file ${pathname}: ${err}`);
}
return null;
}
function buildMenuEntry(manifest) {
let {name, docsUrl, description, pathname} = manifest;
let docsLink = `[<a href="${docsUrl}">Documentation</a>]`;
let dt = `<dt><a href="${pathname}">${name}</a></dt>`;
let dd = `<dd>${escapeHTML(description)} ${docsLink}</dd>`;
output = dt+"\n"+dd+"\n";
return output;
}
function buildMenuHTML(manifestList) {
let output = "";
manifestList.forEach(entry => {
output += buildMenuEntry(entry);
});
return output;
}
function getManifestFromDirectory(pathname) {
let manifestPath = `${pathname}${path.sep}manifest.json`;
let manifest = readJSONFile(manifestPath);
return manifest;
}
function compareManifests(a, b) {
if (a.name < b.name) {
return -1;
}
if (a.name > b.name) {
return 1;
}
return 0;
}
function loadAllManifests(files, pathname) {
let manifestList = [];
files.forEach(entry => {
if (entry.isDirectory()) {
const entryPath = `${pathname}${path.sep}${entry.name}`;
let manifest = getManifestFromDirectory(entryPath);
if (manifest) {
manifest.pathname = entryPath;
manifestList.push(manifest);
}
}
});
return manifestList.sort(compareManifests);
}
function buildMenu(pathname) {
let output = "";
const readdirOptions = {
encoding: "utf8",
withFileTypes: true
};
try {
let files = fs.readdirSync(pathname, readdirOptions);
let manifestList = loadAllManifests(files, pathname);
output = buildMenuHTML(manifestList);
} catch(err) {
console.error("Error reading directory: " + err);
return null;
}
output = `<dl>\n${output}</dl>\n`;
return output;
}