(chore): initial MVP release

core/check.php

@@ -0,0 +1,121 @@
+<?php
+// core/check.php
+declare(strict_types=1);
+
+require __DIR__ . '/connection.php';
+
+date_default_timezone_set('Asia/Kolkata');
+
+// fetch regions from DB
+$regions = db()->query("
+    SELECT region, url
+    FROM regions
+    ORDER BY id ASC
+")->fetchAll();
+
+function runCheck(string $url): array
+{
+    $ch = curl_init($url);
+
+    curl_setopt_array($ch, [
+        CURLOPT_RETURNTRANSFER => true,
+        CURLOPT_FOLLOWLOCATION => true,
+        CURLOPT_TIMEOUT        => 10,
+        CURLOPT_CONNECTTIMEOUT => 5,
+        CURLOPT_NOBODY         => false,
+        CURLOPT_ENCODING       => '',
+        CURLOPT_USERAGENT      =>
+            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) ' .
+            'AppleWebKit/605.1.15 (KHTML, like Gecko) ' .
+            'Version/17.0 Safari/605.1.15',
+    ]);
+
+    $start  = microtime(true);
+    curl_exec($ch);
+    $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    $error  = curl_error($ch);
+    $end    = microtime(true);
+
+    curl_close($ch);
+
+    $rt = (int) round(($end - $start) * 1000);
+
+    // default values
+    $up   = 0;
+    $note = null;
+    $lat  = $rt;
+
+    if ($error) {
+        // cannot reach the domain at all
+        $up   = 0;
+        $lat  = null;
+        $note = 'cannot_fetch_web';
+    } else {
+        // 200–499 = server is UP
+        if ($status >= 200 && $status < 500) {
+            $up = 1;
+
+            if ($status === 403) {
+                $note = 'blocked_by_protection';
+            } elseif ($status === 429) {
+                $note = 'too_many_requests';
+            }
+        }
+        // 500–599 = Cloudflare-style origin error / server-side error
+        elseif ($status >= 500 && $status <= 599) {
+            $up   = 0;
+            $note = 'cloudflare_origin_error';
+        }
+    }
+
+    return [
+        'status'  => $status,
+        'up'      => $up,
+        'latency' => $lat,
+        'error'   => $note
+    ];
+}
+
+$stmt = db()->prepare("
+    INSERT INTO checks (
+        region,
+        monitor_url,
+        checked_at,
+        status_code,
+        is_up,
+        response_time_ms,
+        error_message
+    ) VALUES (
+        :region,
+        :url,
+        NOW(),
+        :status,
+        :up,
+        :lat,
+        :err
+    )
+");
+
+$output = [];
+
+foreach ($regions as $r) {
+    $check = runCheck($r['url']);
+
+    $stmt->execute([
+        ':region' => $r['region'],
+        ':url'    => $r['url'],
+        ':status' => $check['status'],
+        ':up'     => $check['up'],
+        ':lat'    => $check['latency'],
+        ':err'    => $check['error']
+    ]);
+
+    $output[] = [
+        'region' => $r['region'],
+        'url'    => $r['url'],
+        'check'  => $check
+    ];
+}
+
+header("Content-Type: application/json; charset=utf-8");
+echo json_encode($output, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);