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<?php |
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|
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namespace FluentSupport\App\Hooks\Handlers; |
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|
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use FluentSupport\App\Models\Attachment; |
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use FluentSupport\App\Models\Ticket; |
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use FluentSupport\App\Services\Helper; |
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use FluentSupport\Framework\Support\Arr; |
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|
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/** |
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* ExternalPages - Handles public-facing ticket and attachment viewing |
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* |
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*/ |
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class ExternalPages |
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{ |
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public function route() |
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{ |
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// Verify this is a GET request for security |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- REQUEST_METHOD is server-controlled, sanitized for comparison only |
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$requestMethod = isset($_SERVER['REQUEST_METHOD']) ? sanitize_text_field(wp_unslash($_SERVER['REQUEST_METHOD'])) : ''; |
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if ($requestMethod !== 'GET') { |
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wp_die('Invalid request method', 'Method Not Allowed', ['response' => 405]); |
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} |
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|
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// Rate limiting check |
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$this->checkRateLimit(); |
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// Validate required parameter exists and sanitize |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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if (!isset($_REQUEST['fs_view'])) { |
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wp_die('Missing required parameter', 'Bad Request', ['response' => 400]); |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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$route = isset($_REQUEST['fs_view']) ? sanitize_text_field(wp_unslash($_REQUEST['fs_view'])) : ''; |
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|
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if (empty($route)) { |
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wp_die('Missing required parameter', 'Bad Request', ['response' => 400]); |
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} |
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|
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// Validate route value |
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$methodMaps = [ |
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'ticket' => 'handleTicketView' |
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]; |
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|
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if (isset($methodMaps[$route])) { |
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// For public endpoints, verify security using ticket hash validation instead of nonces |
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// This is appropriate for public endpoints that must work without user authentication |
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$this->verifyPublicEndpointSecurity($route); |
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$this->{$methodMaps[$route]}(); |
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} else { |
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wp_die('Invalid route', 'Not Found', ['response' => 404]); |
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} |
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} |
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|
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public function handleTicketView() |
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{ |
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if (!Helper::isPublicSignedTicketEnabled()) { |
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$this->handleInvalidTicket(); |
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} else { |
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$this->handleValidTicket(); |
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} |
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} |
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|
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/** |
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* Display the attachment. |
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* |
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* Uses the new rewrite endpoint to get an attachment ID |
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* and display the attachment if the currently logged in user |
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* has the authorization to. |
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* |
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* @return void |
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* @since 3.2.0 |
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*/ |
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public function view_attachment() |
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{ |
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// Verify this is a GET request for security |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- REQUEST_METHOD is server-controlled, sanitized for comparison only |
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$requestMethod = isset($_SERVER['REQUEST_METHOD']) ? sanitize_text_field(wp_unslash($_SERVER['REQUEST_METHOD'])) : ''; |
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if ($requestMethod !== 'GET') { |
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wp_die('Invalid request method', 'Method Not Allowed', ['response' => 405]); |
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} |
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|
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// Rate limiting check |
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$this->checkRateLimit(); |
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|
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// Validate required parameter exists and sanitize |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses signature validation instead of nonces |
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if (!isset($_REQUEST['fst_file'])) { |
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wp_die('Missing required parameter', 'Bad Request', ['response' => 400]); |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses signature validation instead of nonces |
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$attachmentHash = isset($_REQUEST['fst_file']) ? sanitize_text_field(wp_unslash($_REQUEST['fst_file'])) : ''; |
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|
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if (empty($attachmentHash)) { |
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wp_die('Invalid Attachment Hash', 'Bad Request', ['response' => 400]); |
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} |
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|
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$attachment = $this->getAttachmentByHash($attachmentHash); |
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|
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if (!$attachment) { |
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wp_die('Invalid Attachment Hash', 'Not Found', ['response' => 404]); |
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} |
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|
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// Inline attachments (paste images embedded in ticket/email content) are publicly accessible |
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// without a signature because they are already shared with customers via email. |
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// Other attachments require HMAC signature validation. |
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if ($attachment->status !== 'inline' && !$this->validateAttachmentSignature($attachment)) { |
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$dieMessage = esc_html__('Sorry, Your secure sign is invalid, Please reload the previous page and get new signed url', 'fluent-support'); |
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wp_die(esc_html($dieMessage), 'Forbidden', ['response' => 403]); |
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} |
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|
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//If external file, redirect to the secure download URL |
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if ('local' !== $attachment->driver) { |
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$fileUrl = apply_filters('fluent_support/external_attachment_url', $attachment->full_url, $attachment); |
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if (!empty($fileUrl)) { |
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$this->redirectToExternalAttachment($fileUrl); |
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} else { |
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die('File could not be found'); |
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} |
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} |
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|
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//Handle Local file |
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if (!file_exists($attachment->file_path)) { |
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die('File could not be found'); |
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} |
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$this->serveLocalAttachment($attachment); |
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} |
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|
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private function getAttachmentByHash($attachmentHash) |
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{ |
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return Attachment::where('file_hash', $attachmentHash)->first(); |
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} |
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|
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private function validateAttachmentSignature($attachment) |
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{ |
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// Sanitize and validate secure_sign input - don't trust any input |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses signature validation instead of nonces |
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if (!isset($_REQUEST['secure_sign'])) { |
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return false; |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses signature validation instead of nonces |
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$secureSign = isset($_REQUEST['secure_sign']) ? sanitize_text_field(wp_unslash($_REQUEST['secure_sign'])) : ''; |
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|
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if (empty($secureSign)) { |
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return false; |
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} |
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|
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// Use HMAC-SHA256 for secure signature verification |
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$sign = hash_hmac('sha256', $attachment->id . '|' . gmdate('YmdH'), wp_salt('secure_auth')); |
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return hash_equals($sign, $secureSign); |
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} |
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|
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private function handleInvalidTicket() |
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{ |
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// Validate required parameter exists and sanitize |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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if (!isset($_REQUEST['ticket_id'])) { |
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wp_die('Missing ticket ID parameter', 'Bad Request', ['response' => 400]); |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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$ticketId = isset($_REQUEST['ticket_id']) ? absint($_REQUEST['ticket_id']) : 0; |
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|
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// Validate ticket ID is positive integer |
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if ($ticketId <= 0) { |
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wp_die('Invalid ticket ID', 'Bad Request', ['response' => 400]); |
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} |
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|
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$ticket = Ticket::wherePublicIdentifier($ticketId)->first(); |
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|
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if (!$ticket) { |
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$this->showInvalidPortalMessage(); |
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} else { |
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$this->redirectToTicketView($ticket); |
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} |
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} |
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|
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private function handleValidTicket() |
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{ |
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// Validate required parameters exist and sanitize |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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if (!isset($_REQUEST['support_hash']) || !isset($_REQUEST['ticket_id'])) { |
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wp_die('Missing required parameters', 'Bad Request', ['response' => 400]); |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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$ticketHash = isset($_REQUEST['support_hash']) ? sanitize_text_field(wp_unslash($_REQUEST['support_hash'])) : ''; |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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$ticketId = isset($_REQUEST['ticket_id']) ? absint($_REQUEST['ticket_id']) : 0; |
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|
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// Validate hash format (should be alphanumeric) |
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if (empty($ticketHash) || !preg_match('/^[a-zA-Z0-9]+$/', $ticketHash)) { |
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wp_die('Invalid ticket hash format', 'Bad Request', ['response' => 400]); |
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} |
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|
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// Validate ticket ID is positive integer |
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if ($ticketId <= 0) { |
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wp_die('Invalid ticket ID', 'Bad Request', ['response' => 400]); |
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} |
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|
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$ticket = Ticket::where('hash', $ticketHash) |
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->wherePublicIdentifier($ticketId) |
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->first(); |
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|
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if (!$ticket) { |
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$this->showInvalidPortalMessage(); |
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} elseif (get_current_user_id()) { |
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// Only redirect if user is logged in (to clean up URL) |
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$this->redirectToTicketView($ticket); |
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} |
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// If not logged in, let the page load normally with the hash parameters |
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// The frontend will handle displaying the ticket based on the URL |
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} |
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|
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private function showInvalidPortalMessage() |
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{ |
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echo '<h3 style="text-align: center; margin: 50px 0;">' . esc_html__('Invalid Support Portal URL', 'fluent-support') . '</h3>'; |
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die(); |
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} |
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|
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private function redirectToTicketView($ticket) |
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{ |
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$redirectUrl = Helper::getTicketViewUrl($ticket); |
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$this->redirectToExternalAttachment($redirectUrl); |
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} |
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|
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private function redirectToExternalAttachment($redirectUrl) |
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{ |
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// This redirect is required to serve attachments stored on third-party services (Google Drive, Dropbox). |
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// Safe and intentional: not a malicious or undesired redirect. |
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wp_redirect($redirectUrl, 307); |
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exit(); |
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} |
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|
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// Helper method to serve an attachment |
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private function serveLocalAttachment($attachment) |
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{ |
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$file_path = realpath($attachment->file_path); |
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$uploads = wp_upload_dir(); |
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$uploads_dir = realpath($uploads['basedir']); // Ensures both paths are absolute |
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|
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if (!$file_path || !$uploads_dir || strpos($file_path, $uploads_dir) !== 0 || !file_exists($file_path)) { |
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wp_die(esc_html__('File not found or access denied', 'fluent-support'), 403); |
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return; |
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} |
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|
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ob_get_clean(); |
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$original_user_agent = ini_get('user_agent'); |
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// phpcs:ignore WordPress.PHP.IniSet.Risky -- Temporary change for file serving, restored immediately after |
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ini_set('user_agent', 'Fluent Support/' . FLUENT_SUPPORT_VERSION . '; ' . esc_url(get_bloginfo('url'))); |
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|
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header("Content-Type: " . esc_attr($attachment->file_type)); |
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header("Content-Disposition: inline; filename=\"" . esc_attr($attachment->title) . "\""); |
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|
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_readfile -- Direct file serving required for attachment download |
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readfile($file_path); |
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|
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// phpcs:ignore WordPress.PHP.IniSet.Risky -- Restoring original value |
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ini_set('user_agent', $original_user_agent); |
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die(); |
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} |
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|
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/** |
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* Verify security for public endpoints |
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* This implements a custom security mechanism appropriate for public endpoints |
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* that need to work without user authentication while maintaining security |
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*/ |
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private function verifyPublicEndpointSecurity($route) |
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{ |
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switch ($route) { |
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case 'ticket': |
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// For ticket viewing, we need at least ticket_id |
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// support_hash is required only when public signed tickets are enabled |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Public endpoint uses hash validation instead of nonces |
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if (!isset($_REQUEST['ticket_id'])) { |
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wp_die('Missing ticket ID parameter', 'Bad Request', ['response' => 400]); |
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} |
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|
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// Additional validation will be done in handleValidTicket/handleInvalidTicket |
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break; |
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|
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default: |
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// For any other routes, ensure basic security |
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break; |
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} |
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} |
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|
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/** |
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* Basic rate limiting for public endpoints |
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* Prevents abuse of public ticket/attachment viewing |
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*/ |
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private function checkRateLimit() |
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{ |
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$ip = Helper::getIp(); |
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$transient_key = 'fs_rate_limit_' . wp_hash($ip); |
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$requests = get_transient($transient_key); |
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|
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if ($requests === false) { |
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// First request in this minute |
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set_transient($transient_key, 1, 60); // 60 seconds |
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} else { |
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$requests++; |
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if ($requests > 30) { // Max 30 requests per minute per IP |
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wp_die('Rate limit exceeded. Please try again later.', 'Too Many Requests', ['response' => 429]); |
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} |
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set_transient($transient_key, $requests, 60); |
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} |
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} |
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} |
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|
