feat(server): admin LiveView for host registration, rotate, delete

server/lib/server_web/live/admin_hosts_live.ex

@@ -0,0 +1,132 @@
+defmodule ServerWeb.AdminHostsLive do
+  use ServerWeb, :live_view
+
+  alias Server.{Hosts, Repo, Schema.Host}
+
+  @impl true
+  def mount(_params, _session, socket) do
+    {:ok,
+     socket
+     |> assign(:hosts, Hosts.list_all())
+     |> assign(:new_token, nil)
+     |> assign(:error, nil)}
+  end
+
+  @impl true
+  def handle_event("create", %{"host" => %{"name" => name}}, socket) do
+    case Hosts.create_host(name) do
+      {:ok, {host, token}} ->
+        {:noreply,
+         socket
+         |> assign(:hosts, Hosts.list_all())
+         |> assign(:new_token, %{name: host.name, token: token})
+         |> assign(:error, nil)}
+
+      {:error, cs} ->
+        {:noreply, assign(socket, :error, changeset_message(cs))}
+    end
+  end
+
+  def handle_event("rotate", %{"id" => id}, socket) do
+    %Host{} = host = Repo.get!(Host, id)
+    {:ok, {_, token}} = Hosts.rotate_token(host)
+
+    {:noreply,
+     socket
+     |> assign(:hosts, Hosts.list_all())
+     |> assign(:new_token, %{name: host.name, token: token})}
+  end
+
+  def handle_event("delete", %{"id" => id}, socket) do
+    %Host{} = host = Repo.get!(Host, id)
+    {:ok, _} = Hosts.delete_host(host)
+    {:noreply, assign(socket, :hosts, Hosts.list_all())}
+  end
+
+  defp changeset_message(cs) do
+    cs.errors
+    |> Enum.map_join(", ", fn {k, {msg, _}} -> "#{k}: #{msg}" end)
+  end
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <div class="p-6 max-w-4xl mx-auto space-y-6">
+      <.link navigate={~p"/"} class="text-sm text-zinc-500 hover:text-zinc-900">← Back</.link>
+      <h1 class="text-2xl font-bold">Hosts</h1>
+
+      <section class="bg-white border rounded-lg p-4">
+        <h2 class="font-semibold mb-2">Register a new host</h2>
+        <form phx-submit="create" class="flex gap-2">
+          <input
+            name="host[name]"
+            placeholder="pve-hostname"
+            required
+            class="flex-1 rounded-md border-zinc-300 focus:border-zinc-400 focus:ring-0"
+          />
+          <button type="submit" class="rounded-md bg-zinc-900 text-white px-4">Add</button>
+        </form>
+        <p :if={@error} class="text-sm text-red-600 mt-2">{@error}</p>
+
+        <div :if={@new_token} class="mt-4 p-3 bg-amber-50 border border-amber-200 rounded">
+          <p class="text-sm font-semibold text-amber-900">
+            Token for {@new_token.name} (shown once):
+          </p>
+          <code class="block mt-1 break-all text-sm">{@new_token.token}</code>
+        </div>
+      </section>
+
+      <section class="bg-white border rounded-lg">
+        <table class="w-full text-sm">
+          <thead>
+            <tr class="text-left text-zinc-500 border-b">
+              <th class="py-2 px-3">Name</th>
+              <th class="py-2 px-3">Status</th>
+              <th class="py-2 px-3">Agent</th>
+              <th class="py-2 px-3">Last seen</th>
+              <th class="py-2 px-3 text-right">Actions</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr :for={h <- @hosts} class="border-b last:border-b-0">
+              <td class="py-2 px-3 font-mono">{h.name}</td>
+              <td class="py-2 px-3">{h.status}</td>
+              <td class="py-2 px-3">{h.agent_version || "—"}</td>
+              <td class="py-2 px-3">{format_seen(h.last_seen_at)}</td>
+              <td class="py-2 px-3 text-right space-x-2">
+                <button
+                  phx-click="rotate"
+                  phx-value-id={h.id}
+                  class="text-xs text-zinc-700 underline"
+                  data-confirm={"Rotate token for #{h.name}? Old token will stop working."}
+                >
+                  Rotate
+                </button>
+                <button
+                  phx-click="delete"
+                  phx-value-id={h.id}
+                  class="text-xs text-red-600 underline"
+                  data-confirm={"Delete #{h.name} and all its metrics?"}
+                >
+                  Delete
+                </button>
+              </td>
+            </tr>
+            <tr :if={@hosts == []}>
+              <td colspan="5" class="py-4 px-3 text-center text-zinc-500">
+                No hosts yet.
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </section>
+    </div>
+    """
+  end
+
+  defp format_seen(nil), do: "never"
+
+  defp format_seen(%DateTime{} = dt) do
+    Calendar.strftime(dt, "%Y-%m-%d %H:%M UTC")
+  end
+end