[Feat] Applications

[RichardAnderson]

This pull request introduces a robust application management system, adding support for a new "Application" resource and its types (notably a "Reverse Proxy" type), as well as SSL management for applications. The changes include new action classes for creating, updating, deploying, and deleting applications, a flexible application type abstraction, and significant updates to SSL logic to support both sites and applications.

Application Interface:

Edit Interface:

Below are the most important changes grouped by theme:

Application Management Core:

• Introduced new action classes for application lifecycle: CreateApplication, UpdateApplication, DeleteApplication, DeployApplication, ResetTemplate, and UpdateTemplate, enabling creation, update, deployment, deletion, and template management for applications. [1] [2] [3] [4] [5] [6]
• Added a new application type system with the ApplicationType interface and AbstractApplicationType base class, allowing for pluggable application types. [1] [2]

Reverse Proxy Application Type:

• Implemented the ReverseProxy application type, including form fields, validation, vhost rendering, and uninstall logic. This allows users to create reverse proxy applications with customizable backend settings.
• Added deployment logic for reverse proxy applications with DeployReverseProxy, handling vhost file generation, writing, and webserver reloads.

SSL Management Enhancements:

• Refactored SSL actions (CreateSSL, ActivateSSL, DeactivateSSL, DeleteSSL) to support both Site and Application as parent resources, ensuring SSL certificates can be managed for applications as well as sites. [1] [2] [3] [4] [5]

Validation Improvements:

• Updated domain validation in CreateSite and CreateApplication to enforce uniqueness of domains across both sites and applications on the same server, preventing conflicts. [1] [2]

These changes establish a foundation for managing applications and their SSL certificates in a flexible, extensible way, and introduce the first application type (reverse proxy) with full lifecycle and deployment support.