[API] Add Email/Domain Validation

api/functions/index.js

@@ -1,27 +1,66 @@
 const functions = require("firebase-functions");
 const unicodeRange = require("unicode-range");
+const { parse, tldExists } = require('tldjs');
+const { getDomain } = require('tldjs');
+const punycode = require('punycode');
 
 exports.emailValidation = functions.https.onRequest((request, response) => {
 
-  var email = request.query.email.toString();
+  var regex = /.+@.+\..{2,}/
+  var exception = /[^$!%^&*()=+<>,;|\s]/g
 
-  var getRange = c => unicodeRange("U+" + c.charCodeAt(0).toString(16));
-  var range = getRange(email);
-  var isConsistent = ![...email].some(c => getRange(c) !== range);
+  var email = `${request.query.email}`
+  if (email === "" || email === "undefined") {
+    response.json({ message: "Provide email address!" })
+    return
+  }
 
-  var rangesRTL = [
-    "Arabic",
-    "Imperial Aramaic",
-    "Old Turkic",
-    "Hebrew",
-    "Old Persian"
-  ];
-  var isRTL = rangesRTL.some(r => r === range)
+  var rawEmail = email.replace(/[@_.-]/g, "");
+
+  var getRange = c => unicodeRange(`U+${c.charCodeAt(0).toString(16)}`);
+  var range = getRange(rawEmail);
+  var isConsistent = ![...rawEmail].some(c => getRange(c) !== range);
+  var isEmail = regex.test(email) && exception.test(email)
+  var isTldExists = tldExists(email)
+  var isEmailValid = isConsistent && isEmail && isTldExists
+  var isDomainValid = isDomainValid(email)
 
   response.json({
+    email,
     range: isConsistent ? range : "MIXED",
-    isRTL: isConsistent ? isRTL : "MIXED",
-    isConsistent
+    isConsistent,
+    isEmail,
+    isTldExists,
+    isEmailValid,
+    isDomainValid
   });
 
-});
+});
+
+function isDomainValid(validating){
+  var isDomainLengthValid = true
+  var isTldLengthValid = true
+  var domain = getDomain(email)
+  var tldName  = domain.split(".")[1]
+  var domainLength
+  var tldLength 
+
+  if(range !== "English"){
+    domainLength = (punycode.encode(domain)).length + 4
+    tldLength = (punycode.encode(tldName)).length + 4
+  }
+  else {
+    domainLength = domain.length
+    tldLength = tldName.length
+  }
+
+  if(domainLength > 255) {
+  isDomainLengthValid === false
+  }
+  if(tldLength > 63){
+    isTldLengthValid === false
+  }  
+
+  return isDomainLengthValid && isTldLengthValid
+
+}