Added initial Aluminum Wire files

src/wire/main.js is based upon the "fileserver" feature of the previous version of this project, homeserver. This commit also includes a default 404 error page under defaults/errors/404.html . API documentation will soon be added.
aluminumjs · Aug 23, 2020 · 4399317 · 4399317
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diff --git a/defaults/errors/404.html b/defaults/errors/404.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>404 Error | Aluminum Wire</title>
+</head>
+<body>
+    <h1>404 Error</h1>
+    <p>The requested resource $requrl$ was not found on this server. Please check the request URL.</p>
+    <p>
+        Error Message: $errmessage$<br />
+        Error Code: $errcode$<br />
+        Error Number: $errno$
+    </p>
+    <hr />
+    <p>Aluminum Wire on $osplatform$ ($ostype$) version $osversion$ at port $port$</p>
+    <div style="text-align: center">
+        <img src="/aluminum-internals/logo.svg" alt="Aluminum logo" style="width: 150pt" />
+    </div>
+</body>
+</html>
diff --git a/src/wire/main.js b/src/wire/main.js
@@ -0,0 +1,59 @@
+const http = require('http') // For creating an HTTP server
+// const https = require('https') // For creating an HTTPS server (capability will be added later)
+const fs = require('fs') // For reading files from the server filesystem
+const os = require('os') // For retrieving operating system information (for error pages)
+const path = require('path') // For manipulating request paths
+const mimeTypes = require('mime-types') // For sending the correct Content-Type HTTP header
+
+const errorPage = fs.readFileSync('../../defaults/errors/404.html', 'utf8') // Default error page content
+const logo = fs.readFileSync('../../logo.svg', 'utf8')
+
+function serverHandler (req, res) {
+  const filename = path.join(__dirname, '..', '..', '..', path.normalize(req.url))
+  const mimetype = mimeTypes.lookup(filename)
+  const reqURLArray = req.url.split('/')
+  if (reqURLArray[1] === 'aluminum-internals') {
+    switch (reqURLArray[2]) {
+      case 'logo.svg':
+        res.writeHead(200, { 'Content-Type': 'image/svg+xml' })
+        res.write(logo)
+        return res.end()
+      default:
+        res.writeHead(404, { 'Content-Type': 'text/plain' })
+        res.write('404 ERROR | NOT FOUND' +
+          os.EOL +
+          os.EOL +
+          'The requested internal Aluminum resource, ' +
+          reqURLArray.slice(2).join('/') +
+          ', does not exist. Please check the request URL.' +
+          os.EOL +
+          'Please note that if you have files in a directory named aluminum-internals, then they will not be served. ' +
+          'The URL /aluminum-internals is reserved for AluminumJS internal resources.'
+        )
+        return res.end()
+    }
+  }
+  fs.readFile(filename, function (err, data) {
+    if (err) {
+      res.writeHead(404, { 'Content-Type': 'html' })
+      res.write(
+        errorPage.replace(/\$requrl\$/g, req.url)
+          .replace(/\$osplatform\$/g, os.platform())
+          .replace(/\$ostype\$/g, os.type())
+          .replace(/\$osversion\$/g, os.release())
+          .replace(/\$port\$/g, '80')
+          .replace(/\$errcode\$/, err.code)
+          .replace(/\$errno\$/, err.errno.toString())
+          .replace(/\$errmessage\$/, err.message)
+      )
+      return res.end()
+    }
+    res.writeHead(200, { 'Content-Type': mimetype })
+    res.write(data)
+    return res.end()
+  }
+  )
+}
+
+const server = http.createServer(serverHandler)
+server.listen(80)