switch simple analytics proxy to a netlify function

functions/hello.js

@@ -1,12 +0,0 @@
-export async function handler(event, context) {
-  return {
-    statusCode: 200,
-    headers: {
-      "Content-Type": "application/json",
-    },
-    body: JSON.stringify({
-      message: "Hello from the other side...",
-      lucky_num: `${Math.floor(Math.random() * 100)}`,
-    }),
-  };
-}

functions/send_view.js

@@ -0,0 +1,45 @@
+const request = require("request");
+
+exports.handler = function (event, context, callback) {
+  const reqHeaders = {
+    referer: event.headers["referer"],
+    "user-agent": event.headers["user-agent"],
+  };
+
+  const reqQuery = event.queryStringParameters;
+  reqQuery["ignore-dnt"] = true; // this isn't nefarious, we're not tracking in the first place!
+
+  const reqOptions = {
+    method: "GET",
+    url: "https://queue.simpleanalyticscdn.com/simple.gif",
+    headers: reqHeaders,
+    qs: reqQuery,
+  };
+
+  request(reqOptions, (error, response, body) => {
+    if (error) {
+      console.error(error);
+
+      callback(null, {
+        statusCode: 500,
+      });
+    } else {
+      console.info(response.statusCode, response.headers["simple-analytics-feedback"]);
+
+      const resHeaders = {
+        "content-type": response.headers["content-type"],
+        "cache-control": "no-cache, no-store, must-revalidate",
+        expires: "0",
+        pragma: "no-cache",
+        "x-api-feedback": response.headers["simple-analytics-feedback"],
+        "x-api-destination": response.headers["simple-analytics-location"],
+      };
+
+      callback(null, {
+        statusCode: response.statusCode,
+        headers: resHeaders,
+        body: body,
+      });
+    }
+  });
+};