Payload limits validation added

config.ts

@@ -26,6 +26,11 @@ const CONFIG_INNER = {
       "PRODUCTION": true,
       "DEVELOPMENT": true
     }
+  },
+  PAYLOAD_LIMITS: {
+    MAX_KB_SIZE: 512,
+    MAX_BYTE_SIZE: 524288, // 512 Kb * 1024 (byte / Kb)
+    MIN_STRING_LENGTH_POSSIBLE_OVERLOAD: 131072 // MAX_BYTE_SIZE / 4
   }
 };
 

helpers/helperFunctions.ts

@@ -1,5 +1,6 @@
 import { CONFIG } from "../config";
 import { ObjectT } from "../types";
+import { payloadSizeValidator } from "./payloadSizeValidator";
 
 export function delay(ms: number) {
   return new Promise(resolve => setTimeout(resolve, ms));
@@ -71,7 +72,7 @@ export const getFormDataMeta = (fData: FormData) => {
 
 // Custom JSON.stringify wrapper that keeps as much metadata as possible
 export const jsonStringifyKeepMeta = (data: ObjectT<any>) => {
-  return JSON.stringify(
+  const dataStringified = JSON.stringify(
     data,
     function(key, value) {
       const type = typeof value;
@@ -86,4 +87,12 @@ export const jsonStringifyKeepMeta = (data: ObjectT<any>) => {
       }
     }
   );
+
+  if (payloadSizeValidator(dataStringified))
+    return dataStringified;
+
+  const message = `Payload data was skipped (${CONFIG.PAYLOAD_LIMITS.MAX_KB_SIZE} Kb limit exceeded)`;
+  codebudConsoleWarn(message);
+
+  return JSON.stringify({message});
 }

helpers/payloadSizeValidator.ts

@@ -0,0 +1,27 @@
+import { CONFIG } from "../config";
+
+// returns the byte length of an utf8 string
+const byteLength = (str: string) => {
+  var s = str.length;
+
+  for (var i = str.length - 1; i >= 0; i--) {
+    var code = str.charCodeAt(i);
+
+    if (code > 0x7f && code <= 0x7ff) 
+      s++;
+    else if (code > 0x7ff && code <= 0xffff) 
+      s += 2;
+    if (code >= 0xDC00 && code <= 0xDFFF) 
+      i--; //trail surrogate
+  }
+
+  return s;
+}
+
+// Returns true if str byte size is ok, and false otherwise
+export const payloadSizeValidator = (str: string) => {
+  if (str.length < CONFIG.PAYLOAD_LIMITS.MIN_STRING_LENGTH_POSSIBLE_OVERLOAD)
+    return true;
+
+  return byteLength(str) <= CONFIG.PAYLOAD_LIMITS.MAX_BYTE_SIZE;
+}