Writes a central server file, to serve up API endpoints

server.js

@@ -0,0 +1,63 @@
+const express = require('express');
+const awsServerlessExpress = require('aws-serverless-express');
+const fs = require('fs');
+const path = require('path');
+
+const app = express();
+
+// Read the '/api' directory and import each lambda function
+const handlers = {};
+fs.readdirSync(path.join(__dirname, '/api')).forEach(file => {
+  const route = `/api/${file.split('.')[0]}`; // remove .js extension
+  const handler = require(path.join(__dirname, '/api', file)).handler;
+  handlers[route] = handler;
+  
+  app.get(route, async (req, res) => {
+    try {
+      const result = await new Promise((resolve, reject) => {
+        const cb = (err, response) => err ? reject(err) : resolve(response);
+        const promise = handler(req, {}, cb);
+        if (promise && typeof promise.then === 'function') {
+          promise.then(resolve).catch(reject);
+        }
+      });
+      res.status(result.statusCode).json(JSON.parse(result.body));
+    } catch (err) {
+      res.status(500).json({ error: err.message });
+    }
+  });
+});
+
+app.get('/api', async (req, res) => {
+  const results = {};
+  const url = req.query.url;
+  const handlerPromises = Object.entries(handlers).map(async ([route, handler]) => {
+    try {
+      const result = await new Promise((resolve, reject) => {
+        const cb = (err, response) => err ? reject(err) : resolve(response);
+        const promise = handler({ query: { url } }, {}, cb);
+        if (promise && typeof promise.then === 'function') {
+          promise.then(resolve).catch(reject);
+        }
+      });
+      results[route.slice(5)] = JSON.parse(result.body);  // remove '/api/' prefix
+    } catch (err) {
+      results[route.slice(5)] = { error: err.message };
+    }
+  });
+
+  await Promise.all(handlerPromises);
+  res.json(results);
+});
+
+// Create serverless express server
+const server = awsServerlessExpress
+.createServer(app)
+.listen(3001, () => {
+  console.log('Listening on port 3001');
+});
+
+exports.handler = (event, context) => {
+  console.log(`EVENT: ${JSON.stringify(event)}`);
+  awsServerlessExpress.proxy(server, event, context);
+};