FEAT-1: Add weather app backend functionality to sample app

index.js

@@ -1,11 +1,14 @@
 const express = require('express')
+const weather = require('./src/weatherAPI.js')
+const {requestCityFromIP, requestCoordsFromIP} = require('./src/geoipAPI.js')
+const anonymizeip = require('./src/anonymizeip.js')
 var path = require('path');
 
 const PORT = process.env.PORT || 3000
 const HOST = '0.0.0.0'
 
 // !* Edit here for demos
-const RELEASE_NO = 'PROD-134'
+const RELEASE_NO = 'DEMO-2'
 
 const api = express()
 
@@ -14,10 +17,64 @@ api.set('view engine', 'pug');
 
 api.use(express.static(path.join(__dirname, 'public')));
 
+// Define the main route for the sample app. When the homepage of the sample app
+// is requested, the server will first determine the client's geolocation based
+// on the client's IP address.
 api.get('/', (req, res) => {
-  res.render('index', {
-    release_no: RELEASE_NO
-  })
+
+    const clientIP = req.ip
+    const renderValues = {
+        release_no: RELEASE_NO,
+        ipAddr: anonymizeip(clientIP),
+    }
+
+    requestCityFromIP(clientIP).then((coords) => {
+        console.log('Coords obj:', coords)
+
+        if ("regionName" in coords && "city" in coords && "country" in coords) {
+            renderValues.locationName = `${coords.city}, ${coords.regionName}, ${coords.country}`
+        } else if ("country" in coords) {
+            if ("city" in coords) {
+                renderValues.locationName = `${coords.city}, ${coords.country}`
+            } else if ("region" in coords) {
+                renderValues.locationName = `${coords.regionName}, ${coords.country}`
+            } else {
+                renderValues.locationName = coords.country
+            }
+        } else if ("city" in coords) {
+            renderValues.locationName = coords.city
+        } else {
+            renderValues.locationName = coords.regionName
+        }
+
+        // By default, display the weather in Toronto.
+        return weather("43.7001", "-79.4163", "America/Toronto")
+    }).then((weatherData) => {
+        // renderValues.forecast = JSON.stringify(weatherData)
+        renderValues.forecast = weatherData
+        res.render('index', renderValues)
+    })
+})
+
+api.get('/geolocate', (req, res) => {
+    // If the geolocation permission is denied on the client side, the client
+    // will send a request to `/geolocate` to get the estimated coordinates
+    // of the client's IP address. This will then return the coordinates to the
+    // client, which will use them to call the weather API as it normally would.
+    geoip(req.ip).then((coords) => {
+        res.json(coords)
+    })
+})
+
+api.get('/weather', (req, res) => {
+    const queryParams = req.query
+    if (!queryParams.lat || !queryParams.lon || !queryParams.timezone) {
+        res.status(400).send('Missing query parameters. All of the following are required: lat, lon, timezone')
+    }
+
+    weather(queryParams.lat, queryParams.lon, queryParams.timezone).then((weatherData) => {
+        res.json(weatherData)
+    })
 })
 
 api.listen(PORT, HOST)