AndreGoepel.AppFoundation.MailService 1.0.0

app-foundation

An opinionated application foundation for .NET 10 / Blazor projects — built to be forked, not just read. Implements the boilerplate that every serious web app needs before any business logic can begin.

What this is

Starting a new .NET web application means solving the same problems every time: authentication, user management, roles, admin UI — before a single line of actual product code can be written. This foundation solves that once, cleanly, and in a way that can be extended without fighting the architecture.

It's the base used for client projects and internal tools. Made public because the patterns might be useful to others.

For a deeper look at technical decisions and architecture, see .

Stack

Features

Authentication — three paths, one system

• Username / Password — standard credential flow with hashed storage
• Passkey (WebAuthn / FIDO2) — passwordless login via device biometrics or hardware key
• OTP (Time-based One-Time Password) — TOTP-based two-factor authentication

All three live in the same Identity pipeline — no separate auth services, no third-party auth provider required.

User & Role Management

• Full user administration UI (create, edit, deactivate users)
• Role assignment per user
• Admin-protected area, separated from the public app surface

Admin Frontend

A functional Blazor admin interface — not a UI demo, but a working management layer wired to real data operations via Wolverine handlers and Marten persistence.

Infrastructure

• .NET Aspire orchestration for local development and deployment
• Docker support via docker-compose.example.yml
• CI/CD pipeline via GitHub Actions

Architecture notes

Why Marten? PostgreSQL as a document store removes the ORM mapping layer for most use cases while keeping the option to use relational queries when needed. Event sourcing support is built in for when that pattern fits. No separate NoSQL infrastructure required.

Why Wolverine? Clean handler dispatch without the ceremony of MediatR — with built-in support for message persistence, retries and outbox patterns. The foundation is wired for async messaging from day one, not bolted on later.

Why .NET Aspire? Local orchestration and service discovery without Docker Compose complexity. Aspire handles the coordination between app, database and any future services — and maps cleanly to cloud deployment targets.

Why not microservices from the start? Modular monolith by design. Modules are separated by namespace and handler boundary, not by network boundary. Splitting later is possible — splitting prematurely creates operational overhead before there's a scaling problem that justifies it.

Getting started

Prerequisites

• .NET 10 SDK
• Docker (for the local PostgreSQL container via Aspire)
• (Optional) A FIDO2-capable device or browser for Passkey testing

Run with Aspire (recommended)

git clone https://github.com/andregoepel/app-foundation.git
cd app-foundation

Set required secrets (see Development secrets below), then:

dotnet run --project AndreGoepel.AppFoundation/AndreGoepel.AppFoundation.AppHost

Aspire starts the app and spins up a local PostgreSQL container automatically. The Aspire dashboard is available at https://localhost:15888.

Run with Docker Compose

cp docker-compose.example.yml docker-compose.yml
# Edit docker-compose.yml — adjust credentials if needed
docker compose up

Development secrets

Secrets are stored via dotnet user-secrets and are never committed to source control.

AppHost (AndreGoepel.AppFoundation.AppHost)

Run from AndreGoepel.AppFoundation/AndreGoepel.AppFoundation.AppHost/:

dotnet user-secrets set "Parameters:database-password" "<your-password>"

App (AndreGoepel.AppFoundation)

Run from AndreGoepel.AppFoundation/AndreGoepel.AppFoundation/:

dotnet user-secrets set "ConnectionStrings:appfoundation-database" "Host=localhost;Port=59746;Username=db-user;Password=<your-password>;Database=appfoundation-database"

Status

Active development. Core authentication flows and admin UI are functional. Identity stores, projections, middleware, and cleanup are covered by unit and Testcontainers-backed integration tests; the interactive auth pages have bUnit coverage on the form-submit paths. Not yet: production deployment guides, exhaustive Manage/Administration UI tests, formal security review of the login handoff.

Feedback and issues welcome.

License

MIT — use freely, attribution appreciated but not required.

Built by André Göpel — Senior Web Engineer · .NET & Blazor