Add code snippet for ICS-generation.

index.js

@@ -0,0 +1,56 @@
+const express = require("express");
+const fs = require("fs");
+const ics = require("ics");
+const marked = require("marked");
+
+// Define defaults of HTTP port/host, can be redefined by environment variables.
+const HTTP_PORT = process.env.HTTP_PORT || 8080;
+const HTTP_HOST = process.env.HTTP_HOST || "localhost";
+const README_FILE = "README.md";
+
+// Init the Express application instance.
+const app = express();
+
+// Just show `README.md` file as a main page.
+app.get("/", (req, res) => {
+  fs.readFile(README_FILE, { encoding: "utf8" }, (error, file) => {
+    if (error) {
+      console.error(error);
+      process.exit(1);
+      return;
+    }
+    const html = marked.marked(file);
+    res.send(html);
+  });
+});
+
+// Generate ICS-file example tuned with URL query parameters.
+app.get("/generate-event", function (req, res) {
+  // Load event template from the file.
+  const eventTemplate = require("./eventTemplate");
+  let event = JSON.parse(JSON.stringify(eventTemplate.eventTemplate));
+  event.description = req.query.description;
+  ics.createEvent(event, (error, iCalEventText) => {
+    if (error) {
+      console.error(error);
+      return;
+    }
+
+    // Response as a file if required.
+    if (req.query.output === "file") {
+      res.set({
+        "Content-Type": "text/calendar",
+        "Content-Disposition": "inline;filename=calendar.ics",
+      });
+    } else {
+      res.set({
+        "Content-Type": "text/plain",
+      });
+    }
+    res.send(iCalEventText);
+  });
+});
+
+// Starting a HTTP server.
+console.log(`Server is running on http://${HTTP_HOST}:${HTTP_PORT}...`);
+app.listen(HTTP_PORT);