IO-3051 canvas-handler optimization

Signed-off-by: Allan Carr <allan.carr@thinkimex.com>

server/middleware/validateCanvasRequestMiddleware.js

@@ -0,0 +1,20 @@
+const { isObject } = require("lodash");
+
+const validateCanvasRequestMiddleware = (req, res, next) => {
+  const { w, h, values, keys, override } = req.body;
+  if (!values || !keys) {
+    return res.status(400).send("Missing required data");
+  }
+  if (override && !isObject(override)) {
+    return res.status(400).send("Override must be an object");
+  }
+  if (w && (!Number.isFinite(w) || w <= 0)) {
+    return res.status(400).send("Width must be a positive number");
+  }
+  if (h && (!Number.isFinite(h) || h <= 0)) {
+    return res.status(400).send("Height must be a positive number");
+  }
+  next();
+};
+
+module.exports = validateCanvasRequestMiddleware;