add GA, email, stripe, url shortener templates

Author: sw-yx

src/functions-templates/js/google-analytics/.netlify-function-template.js

@@ -0,0 +1,7 @@
+module.exports = {
+  name: "google-analytics",
+  description: "Google Analytics: proxy for GA on your domain to avoid adblock",
+  async onComplete() {
+    // your message here
+  }
+};

src/functions-templates/js/google-analytics/google-analytics.js

@@ -0,0 +1,129 @@
+// with thanks to https://github.com/codeniko/simple-tracker/blob/master/examples/server-examples/aws-lambda/google-analytics.js
+const request = require("request");
+const querystring = require("querystring");
+const uuidv4 = require("uuid/v4");
+
+const GA_ENDPOINT = `https://www.google-analytics.com/collect`;
+
+// Domains to whitelist. Replace with your own!
+const originWhitelist = []; // keep this empty and append domains to whitelist using whiteListDomain()
+whitelistDomain("test.com");
+whitelistDomain("nfeld.com");
+
+function whitelistDomain(domain, addWww = true) {
+  const prefixes = ["https://", "http://"];
+  if (addWww) {
+    prefixes.push("https://www.");
+    prefixes.push("http://www.");
+  }
+  prefixes.forEach(prefix => originWhitelist.push(prefix + domain));
+}
+
+function proxyToGoogleAnalytics(event, done) {
+  // get GA params whether GET or POST request
+  const params =
+    event.httpMethod.toUpperCase() === "GET"
+      ? event.queryStringParameters
+      : JSON.parse(event.body);
+  const headers = event.headers || {};
+
+  // attach other GA params, required for IP address since client doesn't have access to it. UA and CID can be sent from client
+  params.uip = headers["x-forwarded-for"] || headers["x-bb-ip"] || ""; // ip override. Look into headers for clients IP address, as opposed to IP address of host running lambda function
+  params.ua = params.ua || headers["user-agent"] || ""; // user agent override
+  params.cid = params.cid || uuidv4(); // REQUIRED: use given cid, or generate a new one as last resort. Generating should be avoided because one user can show up in GA multiple times. If user refresh page `n` times, you'll get `n` pageviews logged into GA from "different" users. Client should generate a uuid and store in cookies, local storage, or generate a fingerprint. Check simple-tracker client example
+
+  console.info("proxying params:", params);
+  const qs = querystring.stringify(params);
+
+  const reqOptions = {
+    method: "POST",
+    headers: {
+      "Content-Type": "image/gif"
+    },
+    url: GA_ENDPOINT,
+    body: qs
+  };
+
+  request(reqOptions, (error, result) => {
+    if (error) {
+      console.info("googleanalytics error!", error);
+    } else {
+      console.info(
+        "googleanalytics status code",
+        result.statusCode,
+        result.statusMessage
+      );
+    }
+  });
+
+  done();
+}
+
+exports.handler = function(event, context, callback) {
+  const origin = event.headers["origin"] || event.headers["Origin"] || "";
+  console.log(`Received ${event.httpMethod} request from, origin: ${origin}`);
+
+  const isOriginWhitelisted = originWhitelist.indexOf(origin) >= 0;
+  console.info("is whitelisted?", isOriginWhitelisted);
+
+  const headers = {
+    //'Access-Control-Allow-Origin': '*', // allow all domains to POST. Use for localhost development only
+    "Access-Control-Allow-Origin": isOriginWhitelisted
+      ? origin
+      : originWhitelist[0],
+    "Access-Control-Allow-Methods": "GET,POST,OPTIONS",
+    "Access-Control-Allow-Headers": "Content-Type,Accept"
+  };
+
+  const done = () => {
+    callback(null, {
+      statusCode: 200,
+      headers,
+      body: ""
+    });
+  };
+
+  const httpMethod = event.httpMethod.toUpperCase();
+
+  if (event.httpMethod === "OPTIONS") {
+    // CORS (required if you use a different subdomain to host this function, or a different domain entirely)
+    done();
+  } else if (
+    (httpMethod === "GET" || httpMethod === "POST") &&
+    isOriginWhitelisted
+  ) {
+    // allow GET or POST, but only for whitelisted domains
+    proxyToGoogleAnalytics(event, done);
+  } else {
+    callback("Not found");
+  }
+};
+
+/*
+ Docs on GA endpoint and example params
+
+ https://developers.google.com/analytics/devguides/collection/protocol/v1/devguide
+
+v: 1
+_v: j67
+a: 751874410
+t: pageview
+_s: 1
+dl: https://nfeld.com/contact.html
+dr: https://google.com
+ul: en-us
+de: UTF-8
+dt: Nikolay Feldman - Software Engineer
+sd: 24-bit
+sr: 1440x900
+vp: 945x777
+je: 0
+_u: blabla~
+jid: 
+gjid: 
+cid: 1837873423.1522911810
+tid: UA-116530991-1
+_gid: 1828045325.1524815793
+gtm: u4d
+z: 1379041260
+*/