# ShopDB Endpoint Agent

A Windows telemetry agent that reports endpoint state to a ShopDB server's
`endpoints` plugin. It runs as a Windows service in production and as a console
app for development and testing.

## Projects

- `ShopDbEndpointAgent.Core` - contracts, config, logging, collection, and the
  resilient collector HTTP client. No host concerns; unit-testable.
- `ShopDbEndpointAgent` - the service host (generic host + Windows service
  lifetime). Composes Core through DI. This is the telemetry runtime.
- `ShopDbEndpointAgent.Tray` - interactive user-session tray app: a system-tray
  icon with "Send Status now" (on-demand report) and the 5-click issue reporter
  (ServiceNow flow is still a scaffold). Separate process from the service,
  because a SYSTEM service cannot draw a tray icon in a user session.

## Configuration

Runtime config is layered. Non-secret defaults live in `appsettings.json`
(shipped with the build). The collector key and base URL are provisioned out of
band in the registry and win over `appsettings.json`, so a distributed build
never carries the secret and the site can rotate the key without a rebuild.

### Registry (production)

Create these values under `HKLM\SOFTWARE\GE\ShopDB` (64-bit view):

| Value          | Type   | Meaning                                          |
|----------------|--------|--------------------------------------------------|
| `BaseUrl`      | String | `https://shopdb.example.net` (server root)       |
| `CollectorKey` | String | The endpoint agent key from Settings -> Endpoints -> Key management |

Example (elevated PowerShell):

```
New-Item -Path 'HKLM:\SOFTWARE\GE\ShopDB' -Force | Out-Null
Set-ItemProperty -Path 'HKLM:\SOFTWARE\GE\ShopDB' -Name 'BaseUrl' -Value 'https://shopdb.example.net'
Set-ItemProperty -Path 'HKLM:\SOFTWARE\GE\ShopDB' -Name 'CollectorKey' -Value '<paste the generated key>'
```

### appsettings.json (all environments)

| Key               | Default     | Meaning                                        |
|-------------------|-------------|------------------------------------------------|
| `baseurl`         | ""          | Dev fallback for the server root (registry wins). |
| `apikey`          | placeholder | Dev fallback for the collector key (registry wins). |
| `cadenceseconds`  | 900         | Report interval (15 min).                      |
| `jitterseconds`   | 60          | Random +/- spread on the interval (anti-herd). |
| `adoptonfirstrun` | true        | Send `adopt=true` on first contact only.       |
| `utilitiespath`   | ""          | Directory of site PowerShell "agent utilities". |
| `logpath`         | ""          | Override the rolling log directory.            |

For a dev box, set `baseurl` and `apikey` here and skip the registry.

## Running

Console (dev), one report then exit:

```
dotnet run --project ShopDbEndpointAgent -- --once
```

Console (dev), continuous cadence loop:

```
dotnet run --project ShopDbEndpointAgent -- --console
```

## Install as a Windows service

Publish self-contained, then register with `sc.exe` (elevated):

```
dotnet publish ShopDbEndpointAgent -c Release -r win-x64 --self-contained -o C:\ProgramData\ShopDB\EndpointAgent\bin
sc.exe create "ShopDBEndpointAgent" binPath= "C:\ProgramData\ShopDB\EndpointAgent\bin\shopdb-endpoint-agent.exe" start= auto DisplayName= "ShopDB Endpoint Agent"
sc.exe description "ShopDBEndpointAgent" "Reports endpoint telemetry to ShopDB."
sc.exe start "ShopDBEndpointAgent"
```

The service runs as LocalSystem by default, which it needs to read the Security
event channel and system WMI.

## Tray app (system-tray icon)

The tray is a per-user process, not a service, so it starts at sign-in rather
than under `sc.exe`. `install-shopdbagent.ps1` handles it: it copies
`shopdb-endpoint-tray.exe` next to the agent, registers an HKCU logon autostart
(`Software\Microsoft\Windows\CurrentVersion\Run\ShopDbEndpointTray`), and
launches it for the current user. Run the installer from the operator's own
session so the autostart lands in the right user hive. Pass `-NoTray` for a
headless, service-only install.

Right-click the tray icon for:

- `Send Status now` - reports this PC to ShopDB immediately so the monitor page
  refreshes without waiting for the next cadence tick. It shells out to
  `shopdbagent.exe --once`, reusing the exact production collection path; the
  tray holds no collector key. A balloon tip reflects success or failure (on
  failure, see the rolling agent log).
- `Report an issue...` - the ServiceNow ticket flow (scaffold; submission path
  is an open decision).

A desktop shortcut to `shopdb-endpoint-tray.exe` can be added later for an
explicitly launchable ServiceNow surface.

## WebUI command execution model (security context)

The WebUI can send an endpoint an allowlisted command (server source of truth:
`plugins/endpoints/commands.py`; agent handler: `CommandExecutor`). The agent
service runs as LocalSystem, but not every command runs in that context. The
launch context is chosen per action so processes surface to the operator while
privileged operations keep the token they need:

- Generic `process_start` (for example DncMain, UDC) launches into the ACTIVE
  CONSOLE USER's session at medium integrity, so the app is visible on the
  operator's desktop. CyberArk/EPM brokers any elevation afterward.
- Generic `process_stop` / `process_status` run as SYSTEM (kill and probe).
- `service_start` / `service_stop` / `service_status` run as SYSTEM, because
  service control requires the admin/SYSTEM token.
- `mtconnect_start` / `mtconnect_stop` / `mtconnect_status` all run as SYSTEM,
  because MTConnect is the "UDC MTConnect Agent" Windows service and service
  control requires the admin/SYSTEM token. `mtconnect_start` runs `install.bat`
  (`Agent.exe install`) to install or repair the service, then ensures it is
  running; `mtconnect_stop` stops the service; `mtconnect_status` queries it.
  `run.bat` (`agent.exe run agent.cfg`) is a foreground TESTING launcher and is
  deliberately NOT used by the agent.
- `system_restart` runs as SYSTEM and reboots the machine immediately via
  `shutdown.exe /r /t 0` (no grace timer). It is a fixed action with no target,
  gated server-side by the dedicated `endpoints.restart` permission on top of
  `endpoints.command`, and fronted by a WebUI confirmation gate.

Do not route MTConnect through the generic `process_start` user-session path or
service control breaks. MTConnect is intentionally absent from the
`process_start` launch map for the same reason; the fixed `mtconnect_*` handler
owns it.

Behavior note for redeploys: the MTConnect service-control model is a runtime
change, so the agent must be rebuilt and redeployed for it to take effect.
Server-side command/allowlist/RBAC changes are picked up by the container
rebuild; rebuild and redeploy the agent whenever the runtime launch/control
logic itself changes.

## Diagnostics

- Rolling file log: `%ProgramData%\ShopDB\EndpointAgent\logs\agent-YYYYMMDD.log`
  (14-day retention).
- Windows Event Log: agent runtime failures and unhandled exceptions are written
  to the `Application` log under source `ShopDB Endpoint Agent`. The source is
  created on first elevated run (or by the installer). Filter Event Viewer by
  that source to see agent/system interop failures.

## Agent utilities (PowerShell seam)

If `utilitiespath` points at a directory, the runtime runs each `*.ps1` there
per report, parses its JSON stdout, and merges the result into the report. This
is the seam the future server-side "Agent configuration" settings page uses to
push site-authored collectors down. Scripts must be code-signed and
allow-listed before this is enabled in the field (rollout concern).

## Logging extensibility

All runtime code logs through `Microsoft.Extensions.Logging` (`ILogger`). Adding
a sink later (a ShopDB HTTP sink, Seq, syslog) is a host-builder change in
`Program.cs::ConfigureLogging` with no changes to the worker, collector, or
client.