Add user avatar and profile feature, consolidate Auth and UserManagement features (#257)

web/backend/Features/Features.Users/Identity/Argon2PasswordHasher.cs

@@ -0,0 +1,28 @@
+using Infrastructure.PasswordHashing;
+using Microsoft.AspNetCore.Identity;
+
+namespace Features.Auth.Identity;
+
+/// <summary>Adapts <see cref="IPasswordInfrastructure" />'s Argon2 hashing to <see cref="IPasswordHasher{TUser}" />.</summary>
+public sealed class Argon2PasswordHasher(IPasswordInfrastructure passwordInfrastructure)
+    : IPasswordHasher<ApplicationUser>
+{
+    /// <inheritdoc />
+    public string HashPassword(ApplicationUser user, string password) =>
+        passwordInfrastructure.Hash(password);
+
+    /// <inheritdoc />
+    /// <remarks>
+    ///     Never returns <see cref="PasswordVerificationResult.SuccessRehashNeeded" />: Argon2 parameters are
+    ///     fixed by <see cref="IPasswordInfrastructure" />, so <see cref="UserManager{TUser}" />'s automatic
+    ///     rehash-on-verify path never triggers.
+    /// </remarks>
+    public PasswordVerificationResult VerifyHashedPassword(
+        ApplicationUser user,
+        string hashedPassword,
+        string providedPassword
+    ) =>
+        passwordInfrastructure.Verify(providedPassword, hashedPassword)
+            ? PasswordVerificationResult.Success
+            : PasswordVerificationResult.Failed;
+}