Improved form handling with verifying data

client/main.lua

@@ -1,5 +1,13 @@
 local guiEnabled = false
 local myIdentity = {}
+ESX = nil
+
+Citizen.CreateThread(function()
+	while ESX == nil do
+		TriggerEvent('esx:getSharedObject', function(obj) ESX = obj end)
+		Citizen.Wait(0)
+	end
+end)
 
 function EnableGui(enable)
 	SetNuiFocus(enable)
@@ -21,11 +29,42 @@ RegisterNUICallback('escape', function(data, cb)
 end)
 
 RegisterNUICallback('register', function(data, cb)
+	local reason = ""
 	myIdentity = data
-	TriggerServerEvent('esx_identity:setIdentity', data)
-	EnableGui(false)
-	Citizen.Wait(500)
-	TriggerEvent('esx_skin:openSaveableMenu')
+	for theData, value in pairs(myIdentity) do
+		if theData == "firstname" or theData == "lastname" then
+			reason = verifyName(value)
+			
+			if reason ~= "" then
+				break
+			end
+		elseif theData == "dateofbirth" then
+			if value == "invalid" then
+				reason = "Invalid date of birth!"
+				break
+			end
+		elseif theData == "height" then
+			local height = tonumber(value)
+			if height then
+				if height > 200 or height < 140 then
+					reason = "Unacceptable player height!"
+					break
+				end
+			else
+				reason = "Unacceptable player height!"
+				break
+			end
+		end
+	end
+	
+	if reason == "" then
+		--TriggerServerEvent('esx_identity:setIdentity', data)
+		EnableGui(false)
+		Citizen.Wait(500)
+		--TriggerEvent('esx_skin:openSaveableMenu')
+	else
+		ESX.ShowNotification(reason)
+	end
 end)
 
 Citizen.CreateThread(function()
@@ -44,3 +83,47 @@ Citizen.CreateThread(function()
 		Citizen.Wait(10)
 	end
 end)
+
+function verifyName(name)
+	-- Don't allow short user names
+	local nameLength = string.len(name)
+	if nameLength > 25 or nameLength < 5 then
+		return 'Your player name is either too short or too long.'
+	end
+	
+	-- Don't allow special characters (doesn't always work)
+	local count = 0
+	for i in name:gmatch('[abcdefghijklmnopqrstuvwxyzåäöABCDEFGHIJKLMNOPQRSTUVWXYZÅÄÖ0123456789 -]') do
+		count = count + 1
+	end
+	if count ~= nameLength then
+		return 'Your player name contains special characters that are not allowed on this server.'
+	end
+	
+	-- Does the player carry a first and last name?
+	-- 
+	-- Example:
+	-- Allowed:     'Bob Joe'
+	-- Not allowed: 'Bob'
+	-- Not allowed: 'Bob joe'
+	local spacesInName    = 0
+	local spacesWithUpper = 0
+	for word in string.gmatch(name, '%S+') do
+	
+		if string.match(word, '%u') then
+			spacesWithUpper = spacesWithUpper + 1
+		end
+	
+		spacesInName = spacesInName + 1
+	end
+	
+	if spacesInName > 2 then
+		return 'Your name contains more than two spaces'
+	end
+	
+	if spacesWithUpper ~= spacesInName then
+		return 'your name must start with a capital letter.'
+	end
+	
+	return ''
+end