[statistics] Add soft-delete feature: Resets a client's IP and location

Soft-deleting a client doesn't remove its entire data and usage history
from the database, but just resets IP and location, so it doesn't appear
in its former location anymore.
In case a client is removed from a room, this declutters the client
statistics. Once the client boots again, location and and IP address
will be updated again.

1 files changed, 16 insertions, 4 deletions

diff --git a/modules-available/statistics/page.inc.php b/modules-available/statistics/page.inc.php
index b51e2956..20ff929a 100644
--- a/modules-available/statistics/page.inc.php
+++ b/modules-available/statistics/page.inc.php
@@ -70,8 +70,10 @@ class Page_Statistics extends Page
 			));
 			Message::addSuccess('notes-saved');
 			Util::redirect('?do=statistics&uuid=' . $uuid);
+		} elseif ($action === 'clear-machines') {
+			$this->deleteMachines(true);
 		} elseif ($action === 'delmachines') {
-			$this->deleteMachines();
+			$this->deleteMachines(false);
 			Util::redirect('?do=statistics', true);
 		} elseif ($action === 'rebootmachines') {
 			$this->rebootControl(true);
@@ -184,7 +186,7 @@ class Page_Statistics extends Page
 		}
 	}
 
-	private function deleteMachines()
+	private function deleteMachines($soft)
 	{
 		$ids = Request::post('uuid', [], 'array');
 		$ids = array_values($ids);
@@ -209,8 +211,18 @@ class Page_Statistics extends Page
 			}
 		}
 		if (!empty($delete)) {
-			Database::exec('DELETE FROM machine WHERE machineuuid IN (:delete)', compact('delete'));
-			Message::addSuccess('deleted-n-machines', count($delete));
+			if ($soft) {
+				// "Soft delete" -- keep all data, but set IP address to 0.0.0.0, so it will not be assigned to its
+				// old location anymore. Upon next boot some time in the future, the machine is hopefully relocated
+				// to somewhere else and will appear in a new location
+				Database::exec("UPDATE machine SET clientip = '0.0.0.0', fixedlocationid = NULL, subnetlocationid = NULL
+					WHERE machineuuid IN (:delete)", compact('delete'));
+				Message::addSuccess('cleared-n-machines', count($delete));
+			} else {
+				// Actually purge from DB
+				Database::exec('DELETE FROM machine WHERE machineuuid IN (:delete)', compact('delete'));
+				Message::addSuccess('deleted-n-machines', count($delete));
+			}
 		}
 		if (!empty($ids)) {
 			Message::addWarning('unknown-machine', implode(', ', array_keys($ids)));