add trim option to validator

README.MD

@@ -48,7 +48,7 @@ app:use( rate_limiter{
 ```lua
 local validator = require("validator").middleware
 app:get("/", validator({
-	steamid = "required|string|starts_with:765|size:17",
+	steamid = "required|string|trim|starts_with:765|size:17",
 	amount  = "required|integer|min:1|max:100",
 	sum     = "optional|decimal|min:1.5|max:99.5",
 }), function(req, res, next)

lua/validator.lua

@@ -38,6 +38,10 @@ rulesets["string"] = function(value)
 	end
 end
 
+rulesets["trim"] = function(value)
+	return value:match("^%s*(.-)%s*$")
+end
+
 rulesets["match"] = function(value, patt)
 	return ({value:match(patt)})[1] -- return only one value
 end
@@ -173,8 +177,8 @@ local function express_middleware(params_with_rules, messages) -- messages may b
 		end
 
 		local formatted_values, errors = validate_all(params_with_rules, params_values, messages)
-		if next(errors) then
-			local param_name, msg = next(errors)
+		if errors then
+			local param_name, msg = _G.next(errors)
 			next({
 				message = "Parameter validation failed. " .. param_name .. ": " .. msg,
 				status  = 400,
@@ -187,7 +191,7 @@ local function express_middleware(params_with_rules, messages) -- messages may b
 		end
 
 		if req.valid then print("validator: Some of middlewares already created the req.valid field. Override") end
-		req.valid = params_values
+		req.valid = formatted_values
 
 		next()
 	end