Added login endpoint

Started adding endpoint to login users

Controllers/PasswordVerification.cs

@@ -3,20 +3,39 @@ using System.Security.Cryptography;
 using System.Text;
 
 using TextSender_API.Models;
+using TextSender_API.Repositories;
 
 namespace TextSender_API.Controllers;
 
 public class PasswordVerification
 {
     #region Fiends
+    private UsersRepository? _userRepo;
+    private SaltRepository? _saltRepo;
     private int _keySize = 64;
     private int _iterations = 350000;
     #endregion
 
     #region Constructors
+    public PasswordVerification()
+    {
+    }
+
+    public PasswordVerification(UsersRepository userRepo, SaltRepository saltRepo)
+    {
+        this._userRepo = userRepo;
+        this._saltRepo = saltRepo;
+    }
     #endregion
 
     #region Methods
+    public bool VerifyPassword(User user, string password)
+    {
+        var salt = this._saltRepo.Retrieve(user.Id);
+        var hashedPassword = this.HashPassword(user, salt, password);
+
+        return hashedPassword.Equals(user.Password);
+    }
     public Salt CreateSalt(User user)
     {
         var salt = new Salt();
@@ -25,10 +44,15 @@ public class PasswordVerification
         return salt;
     }
 
-    public string HashPassword(User user, Salt salt)
+    public string HashPassword(User user, Salt salt, string password = "")
     {
         var hashAlgorithm = HashAlgorithmName.SHA512;
 
+        if (!string.IsNullOrEmpty(password))
+        {
+            user.Password = password;
+        }
+
         var hash = Rfc2898DeriveBytes.Pbkdf2(
             Encoding.UTF8.GetBytes(user.Password!),
             salt.Key!,

Controllers/UsersController.cs

@@ -27,6 +27,34 @@ public class UsersController : ControllerBase
     #endregion
 
     #region Methods
+    [HttpPost("login")]
+    public IActionResult Login([FromBody] User userRequest)
+    {
+        try
+        {
+            var connString = this._config.GetConnectionString("MongoDBURI");
+            var userRepo = new UsersRepository(connString!);
+            var saltRepo = new SaltRepository(connString!);
+            var pwdVerify = new PasswordVerification(userRepo, saltRepo);
+            var result = userRepo.Exists(userRequest);
+
+            if (result.Item1 && pwdVerify.VerifyPassword(result.Item2, userRequest.Password!))
+            {
+                Ok(result.Item2);
+            }
+            else
+            {
+                return NotFound();
+            }
+        }
+        catch (Exception ex)
+        {
+            this._logger.LogError($"An error occurred: {ex.Message}");
+        }
+
+        return Ok();
+    }
+
     [HttpPost("register"), DisableRequestSizeLimit]
     public IActionResult Upload([FromBody] User userRequest)
     {

Repositories/UsersRepository.cs

@@ -30,6 +30,20 @@ public class UsersRepository
     #endregion
 
     #region Metods
+    public Tuple<bool, User> Exists(User user)
+    {
+        var allUsers = this.RetrieveAllUsers();
+        var result = allUsers.FirstOrDefault(ea => ea.Username!.Equals(user.Username));
+
+        if (result != null)
+        {
+            return new Tuple<bool, User>(true, result!);
+        }
+        else
+        {
+            return new Tuple<bool, User>(false, new User());
+        }
+    }
     public void CreateUser(User user)
     {
         this._bookCollection.InsertOne(user);
@@ -92,6 +106,11 @@ public class SaltRepository
         return this._bookCollection.Find(_ => true).ToList();
     }
 
+    public Salt Retrieve(string userId)
+    {
+        return this._bookCollection.Find(s => s.UserId.Equals(userId)).FirstOrDefault();
+    }
+
     public void Update(Salt salt)
     {
         var filter = Builders<Salt>.Filter.Eq(u => u.Id, salt.Id);