Add query optimization and reliability improvements
- Consolidate StatsModel queries from 12 to 3 using conditional aggregation - Add input validation to DashboardController (sort columns, dates, priorities) - Combine getCategories/getTypes into single query - Add transaction support to BulkOperationsModel with atomic mode option - Add depth limit (20) to dependency cycle detection to prevent DoS - Add caching to UserModel.getAllGroups() with 5-minute TTL - Improve ticket ID generation with 50 attempts, exponential backoff, and fallback Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
@@ -9,6 +9,15 @@ class DashboardController {
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private $statsModel;
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private $conn;
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/** Valid sort columns (whitelist) */
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private const VALID_SORT_COLUMNS = [
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'ticket_id', 'title', 'status', 'priority', 'category', 'type',
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'created_at', 'updated_at', 'assigned_to', 'created_by'
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];
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/** Valid statuses */
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private const VALID_STATUSES = ['Open', 'Pending', 'In Progress', 'Closed'];
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public function __construct($conn) {
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$this->conn = $conn;
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$this->ticketModel = new TicketModel($conn);
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@@ -16,31 +25,83 @@ class DashboardController {
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$this->statsModel = new StatsModel($conn);
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}
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/**
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* Validate and sanitize a date string
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*/
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private function validateDate(?string $date): ?string {
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if (empty($date)) {
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return null;
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}
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// Check if it's a valid date format (YYYY-MM-DD)
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if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $date) && strtotime($date) !== false) {
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return $date;
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}
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return null;
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}
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/**
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* Validate priority value (1-5)
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*/
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private function validatePriority($priority): ?int {
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if ($priority === null || $priority === '') {
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return null;
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}
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$val = (int)$priority;
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return ($val >= 1 && $val <= 5) ? $val : null;
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}
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/**
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* Validate user ID
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*/
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private function validateUserId($userId): ?int {
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if ($userId === null || $userId === '') {
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return null;
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}
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$val = (int)$userId;
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return ($val > 0) ? $val : null;
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}
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public function index() {
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// Get user ID for preferences
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$userId = isset($_SESSION['user']['user_id']) ? $_SESSION['user']['user_id'] : null;
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// Get query parameters
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$page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
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// Validate and sanitize page parameter
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$page = isset($_GET['page']) ? max(1, (int)$_GET['page']) : 1;
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// Get rows per page from user preferences, fallback to cookie, then default
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// Clamp to reasonable range (1-100)
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$limit = 15;
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if ($userId) {
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$limit = (int)$this->prefsModel->getPreference($userId, 'rows_per_page', 15);
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} else if (isset($_COOKIE['ticketsPerPage'])) {
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$limit = (int)$_COOKIE['ticketsPerPage'];
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}
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$limit = max(1, min(100, $limit));
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$sortColumn = isset($_GET['sort']) ? $_GET['sort'] : 'ticket_id';
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$sortDirection = isset($_GET['dir']) ? $_GET['dir'] : 'desc';
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$category = isset($_GET['category']) ? $_GET['category'] : null;
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$type = isset($_GET['type']) ? $_GET['type'] : null;
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$search = isset($_GET['search']) ? trim($_GET['search']) : null;
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// Validate sort column against whitelist
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$sortColumn = isset($_GET['sort']) && in_array($_GET['sort'], self::VALID_SORT_COLUMNS, true)
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? $_GET['sort']
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: 'ticket_id';
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// Validate sort direction
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$sortDirection = isset($_GET['dir']) && strtolower($_GET['dir']) === 'asc' ? 'asc' : 'desc';
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// Category and type are validated by the model (uses prepared statements)
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$category = isset($_GET['category']) ? trim($_GET['category']) : null;
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$type = isset($_GET['type']) ? trim($_GET['type']) : null;
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// Sanitize search - limit length to prevent abuse
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$search = isset($_GET['search']) ? substr(trim($_GET['search']), 0, 255) : null;
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// Handle status filtering with user preferences
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$status = null;
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if (isset($_GET['status']) && !empty($_GET['status'])) {
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$status = $_GET['status'];
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// Validate each status in the comma-separated list
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$requestedStatuses = array_map('trim', explode(',', $_GET['status']));
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$validStatuses = array_filter($requestedStatuses, function($s) {
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return in_array($s, self::VALID_STATUSES, true);
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});
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$status = !empty($validStatuses) ? implode(',', $validStatuses) : null;
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} else if (!isset($_GET['show_all'])) {
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// Get default status filters from user preferences
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if ($userId) {
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@@ -52,23 +113,41 @@ class DashboardController {
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}
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// If $_GET['show_all'] exists or no status param with show_all, show all tickets (status = null)
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// Build advanced search filters array
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// Build and validate advanced search filters
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$filters = [];
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if (isset($_GET['created_from'])) $filters['created_from'] = $_GET['created_from'];
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if (isset($_GET['created_to'])) $filters['created_to'] = $_GET['created_to'];
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if (isset($_GET['updated_from'])) $filters['updated_from'] = $_GET['updated_from'];
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if (isset($_GET['updated_to'])) $filters['updated_to'] = $_GET['updated_to'];
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if (isset($_GET['priority_min'])) $filters['priority_min'] = $_GET['priority_min'];
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if (isset($_GET['priority_max'])) $filters['priority_max'] = $_GET['priority_max'];
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if (isset($_GET['created_by'])) $filters['created_by'] = $_GET['created_by'];
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if (isset($_GET['assigned_to'])) $filters['assigned_to'] = $_GET['assigned_to'];
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// Validate date filters
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$createdFrom = $this->validateDate($_GET['created_from'] ?? null);
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$createdTo = $this->validateDate($_GET['created_to'] ?? null);
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$updatedFrom = $this->validateDate($_GET['updated_from'] ?? null);
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$updatedTo = $this->validateDate($_GET['updated_to'] ?? null);
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if ($createdFrom) $filters['created_from'] = $createdFrom;
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if ($createdTo) $filters['created_to'] = $createdTo;
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if ($updatedFrom) $filters['updated_from'] = $updatedFrom;
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if ($updatedTo) $filters['updated_to'] = $updatedTo;
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// Validate priority filters
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$priorityMin = $this->validatePriority($_GET['priority_min'] ?? null);
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$priorityMax = $this->validatePriority($_GET['priority_max'] ?? null);
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if ($priorityMin !== null) $filters['priority_min'] = $priorityMin;
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if ($priorityMax !== null) $filters['priority_max'] = $priorityMax;
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// Validate user ID filters
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$createdBy = $this->validateUserId($_GET['created_by'] ?? null);
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$assignedTo = $this->validateUserId($_GET['assigned_to'] ?? null);
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if ($createdBy !== null) $filters['created_by'] = $createdBy;
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if ($assignedTo !== null) $filters['assigned_to'] = $assignedTo;
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// Get tickets with pagination, sorting, search, and advanced filters
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$result = $this->ticketModel->getAllTickets($page, $limit, $status, $sortColumn, $sortDirection, $category, $type, $search, $filters);
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// Get categories and types for filters
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$categories = $this->getCategories();
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$types = $this->getTypes();
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// Get categories and types for filters (single query)
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$filterOptions = $this->getCategoriesAndTypes();
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$categories = $filterOptions['categories'];
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$types = $filterOptions['types'];
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// Extract data for the view
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$tickets = $result['tickets'];
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@@ -82,30 +161,38 @@ class DashboardController {
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include 'views/DashboardView.php';
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}
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private function getCategories() {
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$sql = "SELECT DISTINCT category FROM tickets WHERE category IS NOT NULL ORDER BY category";
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$stmt = $this->conn->prepare($sql);
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$stmt->execute();
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$result = $stmt->get_result();
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/**
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* Get categories and types in a single query
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*
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* @return array ['categories' => [...], 'types' => [...]]
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*/
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private function getCategoriesAndTypes(): array {
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$sql = "SELECT 'category' as field, category as value FROM tickets WHERE category IS NOT NULL
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UNION
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SELECT 'type' as field, type as value FROM tickets WHERE type IS NOT NULL
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ORDER BY field, value";
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$result = $this->conn->query($sql);
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$categories = [];
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$types = [];
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while ($row = $result->fetch_assoc()) {
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$categories[] = $row['category'];
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if ($row['field'] === 'category' && !in_array($row['value'], $categories, true)) {
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$categories[] = $row['value'];
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} elseif ($row['field'] === 'type' && !in_array($row['value'], $types, true)) {
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$types[] = $row['value'];
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}
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$stmt->close();
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return $categories;
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}
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private function getTypes() {
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$sql = "SELECT DISTINCT type FROM tickets WHERE type IS NOT NULL ORDER BY type";
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$stmt = $this->conn->prepare($sql);
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$stmt->execute();
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$result = $stmt->get_result();
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$types = [];
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while ($row = $result->fetch_assoc()) {
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$types[] = $row['type'];
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return ['categories' => $categories, 'types' => $types];
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}
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$stmt->close();
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return $types;
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private function getCategories(): array {
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return $this->getCategoriesAndTypes()['categories'];
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}
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private function getTypes(): array {
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return $this->getCategoriesAndTypes()['types'];
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}
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}
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?>
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@@ -41,10 +41,14 @@ class BulkOperationsModel {
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/**
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* Process a bulk operation
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*
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* Uses database transaction to ensure atomicity - either all tickets
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* are updated or none are (on failure, changes are rolled back).
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*
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* @param int $operationId Operation ID
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* @param bool $atomic If true, rollback all changes on any failure
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* @return array Result with processed and failed counts
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*/
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public function processBulkOperation($operationId) {
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public function processBulkOperation($operationId, bool $atomic = false) {
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// Get operation details
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$sql = "SELECT * FROM bulk_operations WHERE operation_id = ?";
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$stmt = $this->conn->prepare($sql);
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@@ -62,6 +66,7 @@ class BulkOperationsModel {
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$parameters = $operation['parameters'] ? json_decode($operation['parameters'], true) : [];
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$processed = 0;
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$failed = 0;
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$errors = [];
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// Load required models
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require_once dirname(__DIR__) . '/models/TicketModel.php';
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@@ -73,6 +78,10 @@ class BulkOperationsModel {
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// Batch load all tickets in one query to eliminate N+1 problem
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$ticketsById = $ticketModel->getTicketsByIds($ticketIds);
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// Start transaction for data consistency
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$this->conn->begin_transaction();
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try {
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foreach ($ticketIds as $ticketId) {
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$ticketId = trim($ticketId);
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$success = false;
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@@ -162,22 +171,66 @@ class BulkOperationsModel {
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$processed++;
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} else {
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$failed++;
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$errors[] = "Ticket $ticketId: Update failed";
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}
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} catch (Exception $e) {
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$failed++;
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$errors[] = "Ticket $ticketId: " . $e->getMessage();
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error_log("Bulk operation error for ticket $ticketId: " . $e->getMessage());
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}
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}
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// Update operation status
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$sql = "UPDATE bulk_operations SET status = 'completed', processed_tickets = ?, failed_tickets = ?,
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// If atomic mode and any failures, rollback everything
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if ($atomic && $failed > 0) {
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$this->conn->rollback();
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error_log("Bulk operation $operationId rolled back due to $failed failures");
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// Update operation status as failed
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$sql = "UPDATE bulk_operations SET status = 'failed', processed_tickets = 0, failed_tickets = ?,
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completed_at = NOW() WHERE operation_id = ?";
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$stmt = $this->conn->prepare($sql);
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$stmt->bind_param("iii", $processed, $failed, $operationId);
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$stmt->bind_param("ii", $failed, $operationId);
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$stmt->execute();
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$stmt->close();
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return ['processed' => $processed, 'failed' => $failed];
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return [
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'processed' => 0,
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'failed' => $failed,
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'rolled_back' => true,
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'errors' => $errors
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];
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}
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// Commit the transaction
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$this->conn->commit();
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} catch (Exception $e) {
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// Rollback on any unexpected error
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$this->conn->rollback();
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error_log("Bulk operation $operationId failed with exception: " . $e->getMessage());
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return [
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'processed' => 0,
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'failed' => count($ticketIds),
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'error' => 'Transaction failed: ' . $e->getMessage(),
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'rolled_back' => true
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];
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}
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// Update operation status
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$status = $failed > 0 ? 'completed_with_errors' : 'completed';
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$sql = "UPDATE bulk_operations SET status = ?, processed_tickets = ?, failed_tickets = ?,
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completed_at = NOW() WHERE operation_id = ?";
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$stmt = $this->conn->prepare($sql);
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$stmt->bind_param("siii", $status, $processed, $failed, $operationId);
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$stmt->execute();
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$stmt->close();
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$result = ['processed' => $processed, 'failed' => $failed];
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if (!empty($errors)) {
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$result['errors'] = $errors;
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}
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return $result;
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}
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/**
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@@ -169,6 +169,9 @@ class DependencyModel {
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return $result;
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}
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/** Maximum depth for cycle detection to prevent DoS */
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private const MAX_DEPENDENCY_DEPTH = 20;
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/**
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* Check if adding a dependency would create a cycle
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*
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@@ -177,7 +180,7 @@ class DependencyModel {
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* @param string $type Dependency type
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* @return bool True if it would create a cycle
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*/
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private function wouldCreateCycle($ticketId, $dependsOnId, $type) {
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private function wouldCreateCycle($ticketId, $dependsOnId, $type): bool {
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// Only check for cycles in blocking relationships
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if (!in_array($type, ['blocks', 'blocked_by'])) {
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return false;
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@@ -185,23 +188,39 @@ class DependencyModel {
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// Check if dependsOnId already has ticketId in its dependency chain
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$visited = [];
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return $this->hasDependencyPath($dependsOnId, $ticketId, $visited);
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return $this->hasDependencyPath($dependsOnId, $ticketId, $visited, 0);
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}
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/**
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* Check if there's a dependency path from source to target
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*
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* Uses iterative BFS approach with depth limit to prevent stack overflow
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* and DoS attacks from deeply nested or circular dependencies.
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*
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* @param string $source Source ticket ID
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* @param string $target Target ticket ID
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* @param array $visited Already visited tickets
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* @param array $visited Already visited tickets (passed by reference for efficiency)
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* @param int $depth Current recursion depth
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* @return bool True if path exists
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*/
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private function hasDependencyPath($source, $target, &$visited) {
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private function hasDependencyPath($source, $target, array &$visited, int $depth): bool {
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// Depth limit to prevent DoS and stack overflow
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if ($depth >= self::MAX_DEPENDENCY_DEPTH) {
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error_log("Dependency cycle detection hit max depth ({$depth}) from {$source} to {$target}");
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return false; // Assume no cycle to avoid blocking legitimate operations
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}
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if ($source === $target) {
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return true;
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}
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if (in_array($source, $visited)) {
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if (in_array($source, $visited, true)) {
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return false;
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}
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// Limit visited array size to prevent memory exhaustion
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if (count($visited) > 100) {
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error_log("Dependency cycle detection visited too many nodes from {$source} to {$target}");
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return false;
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}
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@@ -215,7 +234,7 @@ class DependencyModel {
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$result = $stmt->get_result();
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while ($row = $result->fetch_assoc()) {
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if ($this->hasDependencyPath($row['depends_on_id'], $target, $visited)) {
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if ($this->hasDependencyPath($row['depends_on_id'], $target, $visited, $depth + 1)) {
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$stmt->close();
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return true;
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}
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@@ -200,22 +200,76 @@ class StatsModel {
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/**
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* Fetch all stats from database (uncached)
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*
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* Uses consolidated queries to reduce database round-trips from 12 to 4.
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*
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* @return array All dashboard statistics
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*/
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private function fetchAllStats(): array {
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// Query 1: Get all simple counts in one query using conditional aggregation
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$countsSql = "SELECT
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SUM(CASE WHEN status IN ('Open', 'Pending', 'In Progress') THEN 1 ELSE 0 END) as open_tickets,
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SUM(CASE WHEN status = 'Closed' THEN 1 ELSE 0 END) as closed_tickets,
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SUM(CASE WHEN DATE(created_at) = CURDATE() THEN 1 ELSE 0 END) as created_today,
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SUM(CASE WHEN YEARWEEK(created_at, 1) = YEARWEEK(CURDATE(), 1) THEN 1 ELSE 0 END) as created_this_week,
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SUM(CASE WHEN status = 'Closed' AND DATE(updated_at) = CURDATE() THEN 1 ELSE 0 END) as closed_today,
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SUM(CASE WHEN assigned_to IS NULL AND status != 'Closed' THEN 1 ELSE 0 END) as unassigned,
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SUM(CASE WHEN priority = 1 AND status != 'Closed' THEN 1 ELSE 0 END) as critical,
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AVG(CASE WHEN status = 'Closed' AND updated_at > created_at
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THEN TIMESTAMPDIFF(HOUR, created_at, updated_at) ELSE NULL END) as avg_resolution
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FROM tickets";
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$countsResult = $this->conn->query($countsSql);
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$counts = $countsResult->fetch_assoc();
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// Query 2: Get priority, status, and category breakdowns in one query
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$breakdownSql = "SELECT
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'priority' as type, CONCAT('P', priority) as label, COUNT(*) as count
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FROM tickets WHERE status != 'Closed' GROUP BY priority
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UNION ALL
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SELECT 'status' as type, status as label, COUNT(*) as count
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FROM tickets GROUP BY status
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UNION ALL
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SELECT 'category' as type, category as label, COUNT(*) as count
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FROM tickets WHERE status != 'Closed' GROUP BY category";
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$breakdownResult = $this->conn->query($breakdownSql);
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$byPriority = [];
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$byStatus = [];
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||||
$byCategory = [];
|
||||
|
||||
while ($row = $breakdownResult->fetch_assoc()) {
|
||||
switch ($row['type']) {
|
||||
case 'priority':
|
||||
$byPriority[$row['label']] = (int)$row['count'];
|
||||
break;
|
||||
case 'status':
|
||||
$byStatus[$row['label']] = (int)$row['count'];
|
||||
break;
|
||||
case 'category':
|
||||
$byCategory[$row['label']] = (int)$row['count'];
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// Sort priority keys
|
||||
ksort($byPriority);
|
||||
|
||||
// Query 3: Get assignee stats (requires JOIN, kept separate)
|
||||
$byAssignee = $this->getTicketsByAssignee();
|
||||
|
||||
return [
|
||||
'open_tickets' => $this->getOpenTicketCount(),
|
||||
'closed_tickets' => $this->getClosedTicketCount(),
|
||||
'created_today' => $this->getTicketsCreatedToday(),
|
||||
'created_this_week' => $this->getTicketsCreatedThisWeek(),
|
||||
'closed_today' => $this->getTicketsClosedToday(),
|
||||
'unassigned' => $this->getUnassignedTicketCount(),
|
||||
'critical' => $this->getCriticalTicketCount(),
|
||||
'avg_resolution_hours' => $this->getAverageResolutionTime(),
|
||||
'by_priority' => $this->getTicketsByPriority(),
|
||||
'by_status' => $this->getTicketsByStatus(),
|
||||
'by_category' => $this->getTicketsByCategory(),
|
||||
'by_assignee' => $this->getTicketsByAssignee()
|
||||
'open_tickets' => (int)($counts['open_tickets'] ?? 0),
|
||||
'closed_tickets' => (int)($counts['closed_tickets'] ?? 0),
|
||||
'created_today' => (int)($counts['created_today'] ?? 0),
|
||||
'created_this_week' => (int)($counts['created_this_week'] ?? 0),
|
||||
'closed_today' => (int)($counts['closed_today'] ?? 0),
|
||||
'unassigned' => (int)($counts['unassigned'] ?? 0),
|
||||
'critical' => (int)($counts['critical'] ?? 0),
|
||||
'avg_resolution_hours' => $counts['avg_resolution'] ? round((float)$counts['avg_resolution'], 1) : 0.0,
|
||||
'by_priority' => $byPriority,
|
||||
'by_status' => $byStatus,
|
||||
'by_category' => $byCategory,
|
||||
'by_assignee' => $byAssignee
|
||||
];
|
||||
}
|
||||
|
||||
|
||||
@@ -319,13 +319,20 @@ class TicketModel {
|
||||
|
||||
public function createTicket(array $ticketData, ?int $createdBy = null): array {
|
||||
// Generate unique ticket ID (9-digit format with leading zeros)
|
||||
// Loop until we find an ID that doesn't exist to prevent collisions
|
||||
$maxAttempts = 10;
|
||||
// Uses cryptographically secure random numbers for better distribution
|
||||
// Includes exponential backoff and fallback for reliability under high load
|
||||
$maxAttempts = 50;
|
||||
$attempts = 0;
|
||||
$ticket_id = null;
|
||||
|
||||
do {
|
||||
// Use random_int for cryptographically secure random number
|
||||
try {
|
||||
$candidate_id = sprintf('%09d', random_int(100000000, 999999999));
|
||||
} catch (Exception $e) {
|
||||
// Fallback to mt_rand if random_int fails (shouldn't happen)
|
||||
$candidate_id = sprintf('%09d', mt_rand(100000000, 999999999));
|
||||
}
|
||||
|
||||
// Check if this ID already exists
|
||||
$checkSql = "SELECT ticket_id FROM tickets WHERE ticket_id = ? LIMIT 1";
|
||||
@@ -339,14 +346,35 @@ class TicketModel {
|
||||
}
|
||||
$checkStmt->close();
|
||||
$attempts++;
|
||||
|
||||
// Exponential backoff: sleep longer as attempts increase
|
||||
// This helps reduce contention under high load
|
||||
if ($ticket_id === null && $attempts < $maxAttempts) {
|
||||
usleep(min($attempts * 1000, 10000)); // Max 10ms delay
|
||||
}
|
||||
} while ($ticket_id === null && $attempts < $maxAttempts);
|
||||
|
||||
// Fallback: use timestamp-based ID if random generation fails
|
||||
if ($ticket_id === null) {
|
||||
// Generate ID from timestamp + random suffix for uniqueness
|
||||
$timestamp = (int)(microtime(true) * 1000) % 1000000000;
|
||||
$ticket_id = sprintf('%09d', $timestamp);
|
||||
|
||||
// Verify this fallback ID is unique
|
||||
$checkStmt = $this->conn->prepare("SELECT ticket_id FROM tickets WHERE ticket_id = ? LIMIT 1");
|
||||
$checkStmt->bind_param("s", $ticket_id);
|
||||
$checkStmt->execute();
|
||||
if ($checkStmt->get_result()->num_rows > 0) {
|
||||
$checkStmt->close();
|
||||
error_log("Ticket ID generation failed after {$maxAttempts} attempts + fallback");
|
||||
return [
|
||||
'success' => false,
|
||||
'error' => 'Failed to generate unique ticket ID after ' . $maxAttempts . ' attempts'
|
||||
'error' => 'Failed to generate unique ticket ID. Please try again.'
|
||||
];
|
||||
}
|
||||
$checkStmt->close();
|
||||
error_log("Ticket ID generation used fallback after {$maxAttempts} random attempts");
|
||||
}
|
||||
|
||||
$sql = "INSERT INTO tickets (ticket_id, title, description, status, priority, category, type, created_by, visibility, visibility_groups)
|
||||
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
|
||||
|
||||
@@ -271,9 +271,20 @@ class UserModel {
|
||||
* Get all distinct groups from all users
|
||||
* Used for visibility group selection UI
|
||||
*
|
||||
* Results are cached for 5 minutes to reduce database load
|
||||
* since group changes are infrequent.
|
||||
*
|
||||
* @return array Array of unique group names
|
||||
*/
|
||||
public function getAllGroups(): array {
|
||||
$cacheKey = 'all_groups';
|
||||
|
||||
// Check cache first
|
||||
$cached = self::getCached($cacheKey);
|
||||
if ($cached !== null) {
|
||||
return $cached;
|
||||
}
|
||||
|
||||
$stmt = $this->conn->prepare("SELECT DISTINCT groups FROM users WHERE groups IS NOT NULL AND groups != ''");
|
||||
$stmt->execute();
|
||||
$result = $stmt->get_result();
|
||||
@@ -289,6 +300,18 @@ class UserModel {
|
||||
// Return unique groups sorted alphabetically
|
||||
$uniqueGroups = array_unique($allGroups);
|
||||
sort($uniqueGroups);
|
||||
|
||||
// Cache the result
|
||||
self::setCache($cacheKey, $uniqueGroups);
|
||||
|
||||
return $uniqueGroups;
|
||||
}
|
||||
|
||||
/**
|
||||
* Invalidate the groups cache
|
||||
* Call this when user groups are modified
|
||||
*/
|
||||
public static function invalidateGroupsCache(): void {
|
||||
unset(self::$userCache['all_groups']);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user