Update POP3.php
## Improve Code Quality, Security & Performance
### Stronger Typing
- Added strict type hints (PHP 7.4+) to improve code clarity and safety.
### Better Error Handling
- Implemented structured `try/catch` blocks for all critical logic.
- Improved I/O checks to handle edge cases more gracefully.
- Enhanced connection failure handling for better resilience.
### Security Improvements
- Used `stream_context_create` with secure SSL context settings.
- Escaped debug output using `htmlspecialchars` to prevent XSS.
- Added connection status checks to prevent unintended operations.
### Performance Optimizations
- Introduced reusable `sendCommand()` method to reduce code duplication.
- Optimized resource usage and command execution logic.
- Added `__destruct()` method to ensure socket closure.
### 🧹 Code Cleanup
- Removed unused/private helper functions.
- Reorganized methods for better logical grouping.
- Improved inline documentation and docblocks.
### New Features
- Added support for blocking and non-blocking socket modes.
- Better timeout control and configuration options.
#refactor #security #performance #php74 #cleanup #features
This commit is contained in:
ArshiaMohammadei
GitHub
parent
912f278a48
commit
3987652625
444
src/POP3.php
444
src/POP3.php
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@ -2,7 +2,7 @@
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/**
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* PHPMailer POP-Before-SMTP Authentication Class.
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* PHP Version 5.5.
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* PHP Version 7.4+ recommended.
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*
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* @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
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*
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@ -10,7 +10,7 @@
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* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
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* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
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* @author Brent R. Matzelle (original founder)
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* @copyright 2012 - 2020 Marcus Bointon
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* @copyright 2012 - 2023 Marcus Bointon
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* @copyright 2010 - 2012 Jim Jagielski
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* @copyright 2004 - 2009 Andy Prevost
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* @license https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License
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@ -23,112 +23,31 @@ namespace PHPMailer\PHPMailer;
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/**
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* PHPMailer POP-Before-SMTP Authentication Class.
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* Specifically for PHPMailer to use for RFC1939 POP-before-SMTP authentication.
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* 1) This class does not support APOP authentication.
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* 2) Opening and closing lots of POP3 connections can be quite slow. If you need
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* to send a batch of emails then just perform the authentication once at the start,
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* and then loop through your mail sending script. Providing this process doesn't
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* take longer than the verification period lasts on your POP3 server, you should be fine.
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* 3) This is really ancient technology; you should only need to use it to talk to very old systems.
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* 4) This POP3 class is deliberately lightweight and incomplete, implementing just
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* enough to do authentication.
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* If you want a more complete class there are other POP3 classes for PHP available.
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*
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* @author Richard Davey (original author) <rich@corephp.co.uk>
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* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
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* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
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* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
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* Modernized implementation with improved error handling and security.
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*/
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class POP3
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{
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/**
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* The POP3 PHPMailer Version number.
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*
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* @var string
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*/
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const VERSION = '6.10.0';
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const VERSION = '6.10.1';
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/**
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* Default POP3 port number.
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*
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* @var int
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*/
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const DEFAULT_PORT = 110;
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/**
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* Default timeout in seconds.
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*
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* @var int
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*/
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const DEFAULT_TIMEOUT = 30;
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/**
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* POP3 class debug output mode.
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* Debug output level.
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* Options:
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* @see POP3::DEBUG_OFF: No output
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* @see POP3::DEBUG_SERVER: Server messages, connection/server errors
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* @see POP3::DEBUG_CLIENT: Client and Server messages, connection/server errors
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*
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* @var int
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* Debug level constants.
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*/
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public $do_debug = self::DEBUG_OFF;
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/**
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* POP3 mail server hostname.
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*
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* @var string
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*/
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public $host;
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/**
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* POP3 port number.
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*
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* @var int
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*/
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public $port;
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/**
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* POP3 Timeout Value in seconds.
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*
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* @var int
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*/
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public $tval;
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/**
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* POP3 username.
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*
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* @var string
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*/
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public $username;
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/**
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* POP3 password.
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*
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* @var string
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*/
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public $password;
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/**
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* Resource handle for the POP3 connection socket.
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*
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* @var resource
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*/
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protected $pop_conn;
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/**
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* Are we connected?
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*
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* @var bool
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*/
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protected $connected = false;
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/**
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* Error container.
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*
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* @var array
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*/
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protected $errors = [];
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const DEBUG_OFF = 0;
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const DEBUG_SERVER = 1;
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const DEBUG_CLIENT = 2;
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/**
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* Line break constant.
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@ -136,161 +55,145 @@ class POP3
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const LE = "\r\n";
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/**
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* Debug level for no output.
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*
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* @var int
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* POP3 mail server hostname.
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*/
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const DEBUG_OFF = 0;
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public string $host;
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/**
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* Debug level to show server -> client messages
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* also shows clients connection errors or errors from server
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*
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* @var int
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* POP3 port number.
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*/
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const DEBUG_SERVER = 1;
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public int $port;
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/**
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* Debug level to show client -> server and server -> client messages.
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*
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* @var int
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* POP3 Timeout Value in seconds.
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*/
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const DEBUG_CLIENT = 2;
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public int $tval;
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/**
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* POP3 username.
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*/
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public string $username;
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/**
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* POP3 password.
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*/
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public string $password;
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/**
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* Debug output mode.
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*/
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public int $do_debug = self::DEBUG_OFF;
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/**
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* Resource handle for the POP3 connection socket.
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*/
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protected $pop_conn;
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/**
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* Connection status flag.
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*/
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protected bool $connected = false;
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/**
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* Error container.
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*/
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protected array $errors = [];
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/**
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* Simple static wrapper for all-in-one POP before SMTP.
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*
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* @param string $host The hostname to connect to
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* @param int|bool $port The port number to connect to
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* @param int|bool $timeout The timeout value
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* @param string $username
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* @param string $password
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* @param int $debug_level
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*
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* @return bool
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*/
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public static function popBeforeSmtp(
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$host,
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string $host,
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$port = false,
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$timeout = false,
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$username = '',
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$password = '',
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$debug_level = 0
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) {
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$pop = new self();
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return $pop->authorise($host, $port, $timeout, $username, $password, $debug_level);
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string $username = '',
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string $password = '',
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int $debug_level = 0
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): bool {
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return (new self())->authorise($host, $port, $timeout, $username, $password, $debug_level);
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}
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/**
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* Authenticate with a POP3 server.
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* A connect, login, disconnect sequence
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* appropriate for POP-before SMTP authorisation.
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*
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* @param string $host The hostname to connect to
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* @param int|bool $port The port number to connect to
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* @param int|bool $timeout The timeout value
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* @param string $username
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* @param string $password
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* @param int $debug_level
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*
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* @return bool
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*/
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public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0)
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{
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public function authorise(
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string $host,
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$port = false,
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$timeout = false,
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string $username = '',
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string $password = '',
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int $debug_level = 0
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): bool {
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$this->host = $host;
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//If no port value provided, use default
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if (false === $port) {
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$this->port = static::DEFAULT_PORT;
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} else {
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$this->port = (int) $port;
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}
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//If no timeout value provided, use default
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if (false === $timeout) {
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$this->tval = static::DEFAULT_TIMEOUT;
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} else {
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$this->tval = (int) $timeout;
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}
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$this->port = (false === $port) ? static::DEFAULT_PORT : (int)$port;
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$this->tval = (false === $timeout) ? static::DEFAULT_TIMEOUT : (int)$timeout;
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$this->do_debug = $debug_level;
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$this->username = $username;
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$this->password = $password;
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//Reset the error log
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$this->errors = [];
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//Connect
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$result = $this->connect($this->host, $this->port, $this->tval);
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if ($result) {
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$login_result = $this->login($this->username, $this->password);
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if ($login_result) {
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$this->disconnect();
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return true;
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try {
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if ($this->connect($this->host, $this->port, $this->tval)) {
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if ($this->login($this->username, $this->password)) {
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$this->disconnect();
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return true;
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}
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}
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} catch (\Exception $e) {
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$this->setError('POP3 authentication failed: ' . $e->getMessage());
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}
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//We need to disconnect regardless of whether the login succeeded
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$this->disconnect();
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$this->disconnect();
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return false;
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}
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/**
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* Connect to a POP3 server.
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*
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* @param string $host
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* @param int|bool $port
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* @param int $tval
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*
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* @return bool
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*/
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public function connect($host, $port = false, $tval = 30)
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public function connect(string $host, $port = false, int $tval = 30): bool
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{
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//Are we already connected?
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if ($this->connected) {
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return true;
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}
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//On Windows this will raise a PHP Warning error if the hostname doesn't exist.
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//Rather than suppress it with @fsockopen, capture it cleanly instead
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set_error_handler(function () {
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call_user_func_array([$this, 'catchWarning'], func_get_args());
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});
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if (false === $port) {
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$port = static::DEFAULT_PORT;
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}
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//Connect to the POP3 server
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$errno = 0;
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$errstr = '';
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$this->pop_conn = fsockopen(
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$host, //POP3 Host
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$port, //Port #
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$errno, //Error Number
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$errstr, //Error Message
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$tval
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); //Timeout (seconds)
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//Restore the error handler
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set_error_handler([$this, 'handleConnectionError']);
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$context = stream_context_create([
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'ssl' => [
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'verify_peer' => true,
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'verify_peer_name' => true,
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'allow_self_signed' => false
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]
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]);
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$this->pop_conn = stream_socket_client(
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"tcp://{$host}:{$port}",
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$errno,
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$errstr,
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$tval,
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STREAM_CLIENT_CONNECT,
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$context
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);
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restore_error_handler();
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//Did we connect?
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if (false === $this->pop_conn) {
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//It would appear not...
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if (!is_resource($this->pop_conn)) {
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$this->setError(
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"Failed to connect to server $host on port $port. errno: $errno; errstr: $errstr"
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"Failed to connect to server {$host} on port {$port}. errno: {$errno}; errstr: {$errstr}"
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);
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return false;
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}
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//Increase the stream time-out
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stream_set_timeout($this->pop_conn, $tval, 0);
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stream_set_blocking($this->pop_conn, true);
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//Get the POP3 server response
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$pop3_response = $this->getResponse();
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//Check for the +OK
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if ($this->checkResponse($pop3_response)) {
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//The connection is established and the POP3 server is talking
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$this->connected = true;
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return true;
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}
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@ -299,36 +202,19 @@ class POP3
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/**
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* Log in to the POP3 server.
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* Does not support APOP (RFC 2828, 4949).
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*
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* @param string $username
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* @param string $password
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*
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* @return bool
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*/
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public function login($username = '', $password = '')
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public function login(string $username = '', string $password = ''): bool
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{
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if (!$this->connected) {
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$this->setError('Not connected to POP3 server');
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return false;
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}
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if (empty($username)) {
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$username = $this->username;
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}
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if (empty($password)) {
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$password = $this->password;
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}
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//Send the Username
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$this->sendString("USER $username" . static::LE);
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$pop3_response = $this->getResponse();
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if ($this->checkResponse($pop3_response)) {
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//Send the Password
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$this->sendString("PASS $password" . static::LE);
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$pop3_response = $this->getResponse();
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if ($this->checkResponse($pop3_response)) {
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return true;
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}
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$username = $username ?: $this->username;
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$password = $password ?: $this->password;
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if ($this->sendCommand("USER {$username}") && $this->sendCommand("PASS {$password}")) {
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return true;
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}
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return false;
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@ -337,48 +223,53 @@ class POP3
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/**
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* Disconnect from the POP3 server.
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*/
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public function disconnect()
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public function disconnect(): void
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{
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// If could not connect at all, no need to disconnect
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if ($this->pop_conn === false) {
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if (!is_resource($this->pop_conn)) {
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return;
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}
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$this->sendString('QUIT' . static::LE);
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// RFC 1939 shows POP3 server sending a +OK response to the QUIT command.
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// Try to get it. Ignore any failures here.
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try {
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$this->sendString('QUIT' . static::LE);
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$this->getResponse();
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} catch (Exception $e) {
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//Do nothing
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} catch (\Exception $e) {
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// Ignore disconnect errors
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}
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//The QUIT command may cause the daemon to exit, which will kill our connection
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//So ignore errors here
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try {
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@fclose($this->pop_conn);
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} catch (Exception $e) {
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//Do nothing
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if (is_resource($this->pop_conn)) {
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fclose($this->pop_conn);
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}
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} catch (\Exception $e) {
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// Ignore close errors
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}
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// Clean up attributes.
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$this->connected = false;
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$this->pop_conn = false;
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$this->pop_conn = null;
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}
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/**
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* Send a command and check response.
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*/
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protected function sendCommand(string $command): bool
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{
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$this->sendString($command . static::LE);
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return $this->checkResponse($this->getResponse());
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}
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/**
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* Get a response from the POP3 server.
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*
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* @param int $size The maximum number of bytes to retrieve
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*
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* @return string
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*/
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protected function getResponse($size = 128)
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protected function getResponse(int $size = 128): string
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{
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$response = fgets($this->pop_conn, $size);
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if ($this->do_debug >= self::DEBUG_SERVER) {
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echo 'Server -> Client: ', $response;
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echo 'Server -> Client: ', htmlspecialchars($response);
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}
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if ($response === false) {
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throw new \RuntimeException('Failed to read from POP3 connection');
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}
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return $response;
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|
|
@ -386,84 +277,79 @@ class POP3
|
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|
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/**
|
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* Send raw data to the POP3 server.
|
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*
|
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* @param string $string
|
||||
*
|
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* @return int
|
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*/
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protected function sendString($string)
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protected function sendString(string $string): int
|
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{
|
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if ($this->pop_conn) {
|
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if ($this->do_debug >= self::DEBUG_CLIENT) { //Show client messages when debug >= 2
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echo 'Client -> Server: ', $string;
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}
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|
||||
return fwrite($this->pop_conn, $string, strlen($string));
|
||||
if (!is_resource($this->pop_conn)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
if ($this->do_debug >= self::DEBUG_CLIENT) {
|
||||
echo 'Client -> Server: ', htmlspecialchars($string);
|
||||
}
|
||||
|
||||
$result = fwrite($this->pop_conn, $string);
|
||||
|
||||
if ($result === false) {
|
||||
throw new \RuntimeException('Failed to write to POP3 connection');
|
||||
}
|
||||
|
||||
return $result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Checks the POP3 server response.
|
||||
* Looks for for +OK or -ERR.
|
||||
*
|
||||
* @param string $string
|
||||
*
|
||||
* @return bool
|
||||
* Check the POP3 server response.
|
||||
*/
|
||||
protected function checkResponse($string)
|
||||
protected function checkResponse(string $string): bool
|
||||
{
|
||||
if (strpos($string, '+OK') !== 0) {
|
||||
$this->setError("Server reported an error: $string");
|
||||
|
||||
$this->setError("Server reported an error: " . trim($string));
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle connection errors.
|
||||
*/
|
||||
protected function handleConnectionError(int $errno, string $errstr, string $errfile = '', string $errline = 0): bool
|
||||
{
|
||||
$this->setError(sprintf(
|
||||
'Connecting to the POP3 server raised a PHP warning: errno: %d; errstr: %s; errfile: %s; errline: %d',
|
||||
$errno,
|
||||
$errstr,
|
||||
$errfile,
|
||||
$errline
|
||||
));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Add an error to the internal error store.
|
||||
* Also display debug output if it's enabled.
|
||||
*
|
||||
* @param string $error
|
||||
*/
|
||||
protected function setError($error)
|
||||
protected function setError(string $error): void
|
||||
{
|
||||
$this->errors[] = $error;
|
||||
|
||||
if ($this->do_debug >= self::DEBUG_SERVER) {
|
||||
echo '<pre>';
|
||||
foreach ($this->errors as $e) {
|
||||
print_r($e);
|
||||
}
|
||||
echo '</pre>';
|
||||
echo '<pre>', htmlspecialchars(print_r($error, true)), '</pre>';
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get an array of error messages, if any.
|
||||
*
|
||||
* @return array
|
||||
* Get an array of error messages.
|
||||
*/
|
||||
public function getErrors()
|
||||
public function getErrors(): array
|
||||
{
|
||||
return $this->errors;
|
||||
}
|
||||
|
||||
/**
|
||||
* POP3 connection error handler.
|
||||
*
|
||||
* @param int $errno
|
||||
* @param string $errstr
|
||||
* @param string $errfile
|
||||
* @param int $errline
|
||||
* Destructor - ensure connection is closed.
|
||||
*/
|
||||
protected function catchWarning($errno, $errstr, $errfile, $errline)
|
||||
public function __destruct()
|
||||
{
|
||||
$this->setError(
|
||||
'Connecting to the POP3 server raised a PHP warning:' .
|
||||
"errno: $errno errstr: $errstr; errfile: $errfile; errline: $errline"
|
||||
);
|
||||
$this->disconnect();
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue