commit b613307a6f14c353dda24df9ce049628aee3e8b1
Author: Maximilian Giller <m.giller.dev@gmail.com>
Date:   Tue Feb 21 04:29:53 2023 +0100

    Initial version

diff --git a/index.php b/index.php
new file mode 100755
index 0000000..25bf28f
--- /dev/null
+++ b/index.php
@@ -0,0 +1,65 @@
+<?php
+
+// Config
+$SECRET_KEY = "ENTER_SECRET_HERE";
+$FILENAME = "last_activity.txt";
+$IDLE_DURATION_THRESHOLD = 60 * 30;    // In seconds
+$SLEEP_DURATION_THRESHOLD = 60 * 60 * 4;    // In seconds
+$EXPECTED_SLEEP_DURATION = 60 * 60 * 9.5;    // In seconds
+
+
+function storeTime($time)
+{
+    global $FILENAME;
+    $file = fopen($FILENAME, "w");
+    fwrite($file, $time);
+    fclose($file);
+}
+
+function getTime()
+{
+    global $FILENAME;
+    $file = fopen($FILENAME, "r");
+    $time = fread($file, filesize($FILENAME));
+    fclose($file);
+    return $time;
+}
+
+
+// Is secret given?
+if (isset($_GET['secret']) && $_GET['secret'] == $SECRET_KEY) {
+    // Update the file
+    storeTime(time());
+    echo "Last activity udpated";
+    die();
+}
+
+// Current status requested
+$last_activity = getTime();
+$response = array(
+    "last_activity" => date(DATE_ATOM, $last_activity)
+);
+
+// Estimate current activity
+$now = time();
+$diff = $now - $last_activity;  // DIFFERENCE IN SECONDS
+if ($diff >= $SLEEP_DURATION_THRESHOLD) {
+    $response['status'] = "Sleeping";
+} else if ($diff >= $IDLE_DURATION_THRESHOLD) {
+    $response['status'] = "Idle";
+} else {
+    $response['status'] = "Active";
+}
+
+// Estimated time until wake up
+if ($response['status'] == "Sleeping") {
+    $response['time_until_wake'] = $EXPECTED_SLEEP_DURATION - $diff;
+} else {
+    $response['time_until_wake'] = 0;
+}
+
+// Respond with JSON
+header('Content-Type: application/json');
+echo json_encode($response);
+
+