feat: sine wave!

BREAKING CHANGE: extra anti-hack protection

Author: ColinEberhardt

src/applause-button.js

@@ -10,14 +10,25 @@ const getClaps = url =>
     }
   }).then(response => response.text());
 
+
+const WAVELENGTH = 60 * 5;
+const secondsForClap = a => (WAVELENGTH * Math.asin(a / 10)) / (Math.PI * 2);
+
+const computeRequest = clapCount => {
+  const requiredSeconds = secondsForClap(clapCount);
+  const serverSeconds = (Date.now() / 1000) % 60;
+  const delta = requiredSeconds - serverSeconds;
+  return delta;
+}
+
 const updateClaps = (claps, url) =>
   // TODO: polyfill for IE (not edge)
   fetch(`${API}/update-claps` + (url ? `?url=${url}` : ""), {
     method: "POST",
     headers: {
       "Content-Type": "text/plain"
     },
-    body: JSON.stringify(claps)
+    body: JSON.stringify(computeRequest(claps))
   }).then(response => response.text());
 
 const arrayOfSize = size => new Array(size).fill(undefined);