Add CORS

package.json

@@ -27,6 +27,7 @@
     "auto-link": "^1.0.0",
     "babel-runtime": "^6.26.0",
     "classnames": "^2.2.6",
+    "cors": "^2.8.5",
     "isomorphic-unfetch": "^3.0.0",
     "lodash": "^4.17.19",
     "next": "^9.4.5-canary.42",

pages/api/route.js

@@ -1,3 +1,23 @@
+import Cors from 'cors'
+
+const cors = Cors({
+  methods: ['GET', 'HEAD'],
+})
+
+// Helper method to wait for a middleware to execute before continuing
+// And to throw an error when an error happens in a middleware
+function runMiddleware(req, res, fn) {
+  return new Promise((resolve, reject) => {
+    fn(req, res, (result) => {
+      if (result instanceof Error) {
+        return reject(result)
+      }
+
+      return resolve(result)
+    })
+  })
+}
+
 function getServerUrl(scenario) {
   if (scenario === '1' || scenario === '2' || scenario === '3') {
     return 'http://ec2-54-208-197-111.compute-1.amazonaws.com'
@@ -9,6 +29,9 @@ function getServerUrl(scenario) {
 }
 
 export default async (request, response) => {
+  // Run the CORS middleware
+  await runMiddleware(request, response, cors)
+
   const { lat1, lng1, lat2, lng2, scenario } = request.query
 
   const server = getServerUrl(scenario)

yarn.lock

@@ -3556,6 +3556,14 @@ core-util-is@~1.0.0:
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
   integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
 
+cors@^2.8.5:
+  version "2.8.5"
+  resolved "https://registry.yarnpkg.com/cors/-/cors-2.8.5.tgz#eac11da51592dd86b9f06f6e7ac293b3df875d29"
+  integrity sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==
+  dependencies:
+    object-assign "^4"
+    vary "^1"
+
 cosmiconfig@^5.0.0:
   version "5.2.1"
   resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-5.2.1.tgz#040f726809c591e77a17c0a3626ca45b4f168b1a"
@@ -6613,7 +6621,7 @@ obj-props@^1.0.0:
   resolved "https://registry.yarnpkg.com/obj-props/-/obj-props-1.3.0.tgz#8884ab21c8d8496c4a7f696c78bf82289c51680b"
   integrity sha512-k2Xkjx5wn6eC3537SWAXHzB6lkI81kS+icMKMkh4nG3w7shWG6MaWOBrNvhWVOszrtL5uxdfymQQfPUxwY+2eg==
 
-object-assign@*, object-assign@^4.0.1, object-assign@^4.1.0, object-assign@^4.1.1:
+object-assign@*, object-assign@^4, object-assign@^4.0.1, object-assign@^4.1.0, object-assign@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
   integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
@@ -9111,6 +9119,11 @@ validate-npm-package-license@^3.0.1:
     spdx-correct "^3.0.0"
     spdx-expression-parse "^3.0.0"
 
+vary@^1:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"
+  integrity sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=
+
 vendors@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/vendors/-/vendors-1.0.4.tgz#e2b800a53e7a29b93506c3cf41100d16c4c4ad8e"