From c0bd20304b9b2f8c2f59e88447a2b98654800af6 Mon Sep 17 00:00:00 2001
From: LuckShiba <LuckShiba@protonmail.com>
Date: Sat, 11 May 2024 19:13:21 -0300
Subject: [PATCH] add: cpf and cnpj validators in FluentValidator

---
 README.md                                     | 18 +++--
 .../Extensions/RuleBuilderExtension.cs        | 79 +++++++++++++++++++
 2 files changed, 92 insertions(+), 5 deletions(-)
 create mode 100644 TakasakiStudio.Lina.Common/Extensions/RuleBuilderExtension.cs

diff --git a/README.md b/README.md
index a9125ed..51a2703 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ A framework to simplify application creation by improving dependency injection,
   - Fluent api
   - Reliable library
   - Easy usage
+  - CPF and CNPJ validators
 - Dependency Injection
   - Life time configurable
   - Easy manipulation
@@ -139,6 +140,7 @@ public class UserConfiguration : IEntityTypeConfiguration<User>
 ```csharp
 using FluentValidation;
 using TakasakiStudio.Lina.Common;
+using TakasakiStudio.Lina.Common.Extensions;
 using TakasakiStudio.Lina.Database.Models;
 
 var user = new User()
@@ -152,6 +154,8 @@ if (!await user.IsValid())
 }
 
 user.Name = "Foo";
+user.Cpf = "349.306.930-80";
+user.Cnpj = "82.099.001/0001-08";
 
 await user.Validate();
 
@@ -159,7 +163,9 @@ Console.WriteLine("Valid");
 
 public class User : BaseEntityValidate<User, UserValidation, int>
 {
-    public string Name { get; set; } = string.Empty;
+    public required string Name { get; set; }
+    public required string Cpf { get; set; }
+    public required string Cnpj { get; set; }
 }
 
 public class UserValidation : AbstractValidator<User>
@@ -167,19 +173,21 @@ public class UserValidation : AbstractValidator<User>
     public UserValidation()
     {
         RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.Cpf).ValidCpf();
+        RuleFor(x => x.Cnpj).ValidCnpj();
     }
 }
 
-public record UserViewModel() : BaseValidationRecord<UserViewModel, UserViewModelValidation>
-{
-    public string Name { get; set; } = string.Empty;
-}
+public record UserViewModel(string Name, string Cpf, string Cnpj)
+    : BaseValidationRecord<UserViewModel, UserViewModelValidation>;
 
 public class UserViewModelValidation : AbstractValidator<UserViewModel>
 {
     public UserViewModelValidation()
     {
         RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.Cpf).ValidCpf();
+        RuleFor(x => x.Cnpj).ValidCnpj();
     }
 }
 ```
diff --git a/TakasakiStudio.Lina.Common/Extensions/RuleBuilderExtension.cs b/TakasakiStudio.Lina.Common/Extensions/RuleBuilderExtension.cs
new file mode 100644
index 0000000..ca2ae0f
--- /dev/null
+++ b/TakasakiStudio.Lina.Common/Extensions/RuleBuilderExtension.cs
@@ -0,0 +1,79 @@
+using System.Text.RegularExpressions;
+using FluentValidation;
+
+namespace TakasakiStudio.Lina.Common.Extensions;
+
+public static partial class RuleBuilderExtension
+{
+    public static IRuleBuilder<T, string> ValidCpf<T>(this IRuleBuilder<T, string> ruleBuilder)
+    {
+        return ruleBuilder.Must(BeAValidCpf);
+    }
+    
+    public static IRuleBuilder<T, string> ValidCnpj<T>(this IRuleBuilder<T, string> ruleBuilder)
+    {
+        return ruleBuilder.Must(BeAValidCnpj);
+    }
+
+    private static bool BeAValidCpf(string input)
+    {
+        var numbers = ToNumbers(input);
+        if (numbers.Length != 11 || numbers.Distinct().Count() == 1)
+            return false;
+
+        var v1 = 0;
+        var v2 = 0;
+
+        for (var i = 0; i < 9; i++) {
+            var number = numbers[8 - i];
+            v1 += number * (9 - i % 10);
+            v2 += number * (9 - (i + 1) % 10);
+        }
+
+        v1 %= 11;
+        v1 %= 10;
+
+        v2 += v1 * 9;
+        v2 %= 11;
+        v2 %= 10;
+		
+        return numbers[9] == v1 && numbers[10] == v2;
+    }
+
+    private static bool BeAValidCnpj(string input)
+    {
+        var numbers = ToNumbers(input);
+        if (numbers.Length != 14)
+            return false;
+		
+        var v1 = 5 * numbers[0] + 4 * numbers[1] + 3 * numbers[2] + 2 * numbers[3] +
+                 9 * numbers[4] + 8 * numbers[5] + 7 * numbers[6] + 6 * numbers[7] +
+                 5 * numbers[8] + 4 * numbers[9] + 3 * numbers[10] + 2 * numbers[11];
+		
+        var v2 = 6 * numbers[0] + 5 * numbers[1] + 4 * numbers[2] + 3 * numbers[3] +
+                 2 * numbers[4] + 9 * numbers[5] + 8 * numbers[6] + 7 * numbers[7] +
+                 6 * numbers[8] + 5 * numbers[9] + 4 * numbers[10] + 3 * numbers[11] +
+                 2 * numbers[12];
+		
+        v1 = 11 - v1 % 11;
+        if (v1 >= 10)
+            v1 = 0;
+	
+        v2 = 11 - v2 % 11;
+        if (v2 >= 10)
+            v2 = 0;
+		
+        return numbers[12] == v1 && numbers[13] == v2;
+    }
+	
+    private static int[] ToNumbers(string input)
+    {
+        var clean = NotNumberRegex().Replace(input, string.Empty);
+        var numbers = clean.ToCharArray().Select(x => int.Parse(x.ToString()));
+		
+        return numbers.ToArray();
+    }
+
+    [GeneratedRegex(@"[^\d]")]
+    private static partial Regex NotNumberRegex();
+}
\ No newline at end of file