feat(analytics): add analytics on deploy script (#32)

lib/settings.js

@@ -0,0 +1,48 @@
+/**
+ * The purpose of this middleware is to set our application settings based
+ * on environment variables or query parameters
+ */
+
+const { initClients } = require('../services/contentful')
+const { updateCookie } = require('./cookies')
+
+const SETTINGS_NAME = 'theExampleAppSettings'
+
+module.exports = async function settingsMiddleware (request, response, next) {
+  // Set default settings based on environment variables
+  let settings = {
+    spaceId: process.env.CONTENTFUL_SPACE_ID,
+    deliveryToken: process.env.CONTENTFUL_DELIVERY_TOKEN,
+    previewToken: process.env.CONTENTFUL_PREVIEW_TOKEN,
+    editorialFeatures: false,
+    // Overwrite default settings using those stored in cookie, if present
+    ...request.cookies.theExampleAppSettings
+  }
+
+  // Allow setting of API credentials via query parameters
+  const { space_id, preview_token, delivery_token } = request.query
+  if (space_id && preview_token && delivery_token) { // eslint-disable-line camelcase
+    settings = {
+      ...settings,
+      spaceId: space_id,
+      deliveryToken: delivery_token,
+      previewToken: preview_token
+    }
+    updateCookie(response, SETTINGS_NAME, settings)
+  }
+
+  // Allow enabling of editorial features via query parameters
+  const { enable_editorial_features } = request.query
+  if (enable_editorial_features !== undefined) { // eslint-disable-line camelcase
+    delete request.query.enable_editorial_features
+    settings.editorialFeatures = true
+    updateCookie(response, SETTINGS_NAME, settings)
+  }
+
+  // The space id needs to be available in the frontend for our example app
+  response.cookie('space_id', settings.spaceId)
+
+  initClients(settings)
+  response.locals.settings = settings
+  next()
+}