first attempt at a webhook consumer

Start-DoneTickConsumer.ps1

@@ -0,0 +1,123 @@
+[string] $ListenUrl = "http://localhost:8080/"
+
+function Write-JsonResponse
+{
+    param(
+        [Parameter(Mandatory=$true)]
+        [System.Net.HttpListenerResponse]
+        $Response,
+
+        [Parameter(Mandatory=$true)]
+        [int]
+        $StatusCode,
+
+        [Parameter(Mandatory=$true)]
+        [hashtable]
+        $Body
+    )
+
+    $json = $Body | ConvertTo-Json -Depth 10
+    $bytes = [System.Text.Encoding]::UTF8.GetBytes($json)
+
+    $Response.StatusCode = $StatusCode
+    $Response.ContentType = "application/json"
+    $Response.ContentEncoding = [System.Text.Encoding]::UTF8
+    $Response.ContentLength64 = $bytes.Length
+    $Response.OutputStream.Write($bytes, 0, $bytes.Length)
+    $Response.OutputStream.Close()
+}
+
+function Read-RequestBody
+{
+    param(
+        [Parameter(Mandatory=$true)]
+        [System.Net.HttpListenerRequest]
+        $Request
+    )
+
+    $reader = [System.IO.StreamReader]::new($Request.InputStream, $Request.ContentEncoding)
+    try {
+        return $reader.ReadToEnd()
+    }
+    finally {
+        $reader.Close()
+    }
+}
+
+function Receive-Webhook
+{
+    param(
+        [Parameter(Mandatory=$true)]
+        [System.Net.HttpListenerContext]
+        $Context
+    )
+
+    $request = $Context.Request
+    $response = $Context.Response
+
+    if ($request.HttpMethod -ne "POST") {
+        Write-JsonResponse -Response $response -StatusCode 405 -Body @{
+            ok = $false
+            error = "Only POST requests are supported."
+        }
+        return
+    }
+
+    $rawBody = Read-RequestBody -Request $request
+    $payload = $null
+
+    try {
+        if ($rawBody) {
+            $payload = $rawBody | ConvertFrom-Json
+        }
+    }
+    catch {
+        Write-JsonResponse -Response $response -StatusCode 400 -Body @{
+            ok = $false
+            error = "Request body was not valid JSON."
+        }
+        return
+    }
+
+    Write-Host "Webhook received at $(Get-Date -Format o)"
+    Write-Host "From: $($request.RemoteEndPoint)"
+    Write-Host "Path: $($request.Url.AbsolutePath)"
+
+    if ($payload) {
+        Write-Host "Payload:"
+        Write-Host ($payload | ConvertTo-Json -Depth 20)
+    }
+    else {
+        Write-Host "Payload: <empty>"
+    }
+
+    # Add your real webhook handling here.
+    # Example: inspect $payload.event, save data, or call another API.
+
+    Write-JsonResponse -Response $response -StatusCode 200 -Body @{
+        ok = $true
+        message = "Webhook accepted."
+        receivedAt = (Get-Date -Format o)
+    }
+}
+
+$listener = [System.Net.HttpListener]::new()
+$listener.Prefixes.Add($ListenUrl)
+
+try {
+    $listener.Start()
+    Write-Host "Webhook consumer listening on $ListenUrl"
+    Write-Host "Press Ctrl+C to stop."
+
+    while ($listener.IsListening) {
+        $context = $listener.GetContext()
+        Receive-Webhook -Context $context
+    }
+}
+finally {
+    if ($listener.IsListening) {
+        $listener.Stop()
+    }
+
+    $listener.Close()
+}