5 files changed, 61 insertions, 2 deletions
diff --git a/Models/Book.cs b/Models/Book.cs
index 49bd527..4a05865 100644
--- a/Models/Book.cs
+++ b/Models/Book.cs
@@ -19,4 +19,4 @@ namespace LibraryAPI.Models {
         [StringLength(128, ErrorMessage = "Title too long")]
         public string? Title { get; set; }
     }
-}
-\ No newline at end of file
+}
diff --git a/Models/Group.cs b/Models/Group.cs
new file mode 100644
index 0000000..f5ed59d
--- /dev/null
+++ b/Models/Group.cs
@@ -0,0 +1,12 @@
+using System.ComponentModel.DataAnnotations;
+using LibraryAPI.Validators;
+
+namespace LibraryAPI.Models {
+    public class Group {
+	public long Id { get; set; }
+	public ICollection<GroupUserAccount>? Users { get; set; }
+	[Required]
+	[Name]
+	public string? Name {get; set; }
+    }
+}
diff --git a/Models/GroupUserAccount.cs b/Models/GroupUserAccount.cs
new file mode 100644
index 0000000..706c2e9
--- /dev/null
+++ b/Models/GroupUserAccount.cs
@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace LibraryAPI.Models {
+    public class GroupUserAccount {
+        public long GroupId { get; set; }
+	public Group? Group { get; set; }
+	public long UserAccountId { get; set; }
+	public UserAccount? UserAccount { get; set; }
+    }
+}
diff --git a/Models/LibraryContext.cs b/Models/LibraryContext.cs
index b07ba54..3f56b0c 100644
--- a/Models/LibraryContext.cs
+++ b/Models/LibraryContext.cs
@@ -4,6 +4,13 @@ namespace LibraryAPI.Models {
     public class LibraryContext : DbContext {
         public DbSet<Author>? Authors { get; set; }
         public DbSet<Book>? Books { get; set; }
+	public DbSet<UserAccount>? Users { get; set; }
+	public DbSet<Group>? Groups { get; set; }
+	public DbSet<GroupUserAccount>? GroupUserAccounts { get; set; }
         public LibraryContext(DbContextOptions<LibraryContext> options) : base(options) {}
+
+	protected override void OnModelCreating(ModelBuilder modelBuilder) {
+            modelBuilder.Entity<GroupUserAccount>().HasKey(sc => new { sc.UserAccountId, sc.GroupId });
+        }
     }
-}
-\ No newline at end of file
+}
diff --git a/Models/UserAccount.cs b/Models/UserAccount.cs
new file mode 100644
index 0000000..e3184ed
--- /dev/null
+++ b/Models/UserAccount.cs
@@ -0,0 +1,30 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.AspNetCore.Identity;
+
+namespace LibraryAPI.Models {
+    public class UserAccount {
+	public long Id { get; set; }
+	[Required]
+	public string? Email { get; set; }
+        private string? _password;
+        [Required]
+	public string? Password { get { return _password; } set { _password = HashPassword(value); } }
+	public ICollection<GroupUserAccount>? Groups { get; set; }
+        private PasswordHasher<UserAccount> _hasher;
+
+	public UserAccount() {
+	    _hasher = new PasswordHasher<UserAccount>();
+	}
+
+	public PasswordVerificationResult VerifyPassword(string to_verify) {
+	     return _hasher.VerifyHashedPassword(this, Password, to_verify);
+	}
+	
+	private string? HashPassword(string? unhashed_password) {
+	    if(unhashed_password != null)
+		return _hasher.HashPassword(this, unhashed_password);
+
+	    return null;
+	}
+    }
+}