Rewrite email parser using ImapEngine, harden processing loop

Replace webklex/php-imap with directorytree/imapengine in the ticket
email parser. ImapEngine is pure PHP over sockets.

Parser improvements:
- Wrap per-message processing in try/catch so one malformed email
  can't abort the run; failures are flagged and logged with UID
- Query unseen + unflagged so previously-failed (flagged) messages
  are no longer re-processed on every cron run
- Skip vacation/auto-responder emails (RFC 3834) to prevent mail
  loops with the ticket auto-reply
- Cap messages per run (50) and attachment size (15MB); inline
  images over 2MB are stored as attachments instead of base64-embedded
  in ticket details
- Atomic lock file creation
- preg_quote() the ticket prefix in subject matching
- Dedupe CC watchers and exclude the sender
- Map webklex 'tls' encryption setting to STARTTLS for compatibility

NDR/DSN parsing now walks MIME parts via the underlying
zbateson parser instead of relying on attachment extraction.

plugins/vendor/psr/log/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2012 PHP Framework Interoperability Group
+
+Permission is hereby granted, free of charge, to any person obtaining a copy 
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights 
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is 
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in 
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

plugins/vendor/psr/log/README.md

@@ -0,0 +1,58 @@
+PSR Log
+=======
+
+This repository holds all interfaces/classes/traits related to
+[PSR-3](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md).
+
+Note that this is not a logger of its own. It is merely an interface that
+describes a logger. See the specification for more details.
+
+Installation
+------------
+
+```bash
+composer require psr/log
+```
+
+Usage
+-----
+
+If you need a logger, you can use the interface like this:
+
+```php
+<?php
+
+use Psr\Log\LoggerInterface;
+
+class Foo
+{
+    private $logger;
+
+    public function __construct(LoggerInterface $logger = null)
+    {
+        $this->logger = $logger;
+    }
+
+    public function doSomething()
+    {
+        if ($this->logger) {
+            $this->logger->info('Doing work');
+        }
+           
+        try {
+            $this->doSomethingElse();
+        } catch (Exception $exception) {
+            $this->logger->error('Oh no!', array('exception' => $exception));
+        }
+
+        // do something useful
+    }
+}
+```
+
+You can then pick one of the implementations of the interface to get a logger.
+
+If you want to implement the interface, you can require this package and
+implement `Psr\Log\LoggerInterface` in your code. Please read the
+[specification text](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md)
+for details.

plugins/vendor/psr/log/composer.json

@@ -0,0 +1,26 @@
+{
+    "name": "psr/log",
+    "description": "Common interface for logging libraries",
+    "keywords": ["psr", "psr-3", "log"],
+    "homepage": "https://github.com/php-fig/log",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "PHP-FIG",
+            "homepage": "https://www.php-fig.org/"
+        }
+    ],
+    "require": {
+        "php": ">=8.0.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Psr\\Log\\": "src"
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "3.x-dev"
+        }
+    }
+}

plugins/vendor/psr/log/src/AbstractLogger.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * This is a simple Logger implementation that other Loggers can inherit from.
+ *
+ * It simply delegates all log-level-specific methods to the `log` method to
+ * reduce boilerplate code that a simple Logger that does the same thing with
+ * messages regardless of the error level has to implement.
+ */
+abstract class AbstractLogger implements LoggerInterface
+{
+    use LoggerTrait;
+}

plugins/vendor/psr/log/src/InvalidArgumentException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Psr\Log;
+
+class InvalidArgumentException extends \InvalidArgumentException
+{
+}

plugins/vendor/psr/log/src/LogLevel.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * Describes log levels.
+ */
+class LogLevel
+{
+    const EMERGENCY = 'emergency';
+    const ALERT     = 'alert';
+    const CRITICAL  = 'critical';
+    const ERROR     = 'error';
+    const WARNING   = 'warning';
+    const NOTICE    = 'notice';
+    const INFO      = 'info';
+    const DEBUG     = 'debug';
+}

plugins/vendor/psr/log/src/LoggerAwareInterface.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * Describes a logger-aware instance.
+ */
+interface LoggerAwareInterface
+{
+    /**
+     * Sets a logger instance on the object.
+     */
+    public function setLogger(LoggerInterface $logger): void;
+}

plugins/vendor/psr/log/src/LoggerAwareTrait.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * Basic Implementation of LoggerAwareInterface.
+ */
+trait LoggerAwareTrait
+{
+    /**
+     * The logger instance.
+     */
+    protected ?LoggerInterface $logger = null;
+
+    /**
+     * Sets a logger.
+     */
+    public function setLogger(LoggerInterface $logger): void
+    {
+        $this->logger = $logger;
+    }
+}

plugins/vendor/psr/log/src/LoggerInterface.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * Describes a logger instance.
+ *
+ * The message MUST be a string or object implementing __toString().
+ *
+ * The message MAY contain placeholders in the form: {foo} where foo
+ * will be replaced by the context data in key "foo".
+ *
+ * The context array can contain arbitrary data. The only assumption that
+ * can be made by implementors is that if an Exception instance is given
+ * to produce a stack trace, it MUST be in a key named "exception".
+ *
+ * See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
+ * for the full interface specification.
+ */
+interface LoggerInterface
+{
+    /**
+     * System is unusable.
+     *
+     * @param mixed[] $context
+     */
+    public function emergency(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Action must be taken immediately.
+     *
+     * Example: Entire website down, database unavailable, etc. This should
+     * trigger the SMS alerts and wake you up.
+     *
+     * @param mixed[] $context
+     */
+    public function alert(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Critical conditions.
+     *
+     * Example: Application component unavailable, unexpected exception.
+     *
+     * @param mixed[] $context
+     */
+    public function critical(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Runtime errors that do not require immediate action but should typically
+     * be logged and monitored.
+     *
+     * @param mixed[] $context
+     */
+    public function error(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Exceptional occurrences that are not errors.
+     *
+     * Example: Use of deprecated APIs, poor use of an API, undesirable things
+     * that are not necessarily wrong.
+     *
+     * @param mixed[] $context
+     */
+    public function warning(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Normal but significant events.
+     *
+     * @param mixed[] $context
+     */
+    public function notice(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Interesting events.
+     *
+     * Example: User logs in, SQL logs.
+     *
+     * @param mixed[] $context
+     */
+    public function info(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Detailed debug information.
+     *
+     * @param mixed[] $context
+     */
+    public function debug(string|\Stringable $message, array $context = []): void;
+
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param mixed $level
+     * @param mixed[] $context
+     *
+     * @throws \Psr\Log\InvalidArgumentException
+     */
+    public function log($level, string|\Stringable $message, array $context = []): void;
+}

plugins/vendor/psr/log/src/LoggerTrait.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * This is a simple Logger trait that classes unable to extend AbstractLogger
+ * (because they extend another class, etc) can include.
+ *
+ * It simply delegates all log-level-specific methods to the `log` method to
+ * reduce boilerplate code that a simple Logger that does the same thing with
+ * messages regardless of the error level has to implement.
+ */
+trait LoggerTrait
+{
+    /**
+     * System is unusable.
+     */
+    public function emergency(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::EMERGENCY, $message, $context);
+    }
+
+    /**
+     * Action must be taken immediately.
+     *
+     * Example: Entire website down, database unavailable, etc. This should
+     * trigger the SMS alerts and wake you up.
+     */
+    public function alert(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::ALERT, $message, $context);
+    }
+
+    /**
+     * Critical conditions.
+     *
+     * Example: Application component unavailable, unexpected exception.
+     */
+    public function critical(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::CRITICAL, $message, $context);
+    }
+
+    /**
+     * Runtime errors that do not require immediate action but should typically
+     * be logged and monitored.
+     */
+    public function error(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::ERROR, $message, $context);
+    }
+
+    /**
+     * Exceptional occurrences that are not errors.
+     *
+     * Example: Use of deprecated APIs, poor use of an API, undesirable things
+     * that are not necessarily wrong.
+     */
+    public function warning(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::WARNING, $message, $context);
+    }
+
+    /**
+     * Normal but significant events.
+     */
+    public function notice(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::NOTICE, $message, $context);
+    }
+
+    /**
+     * Interesting events.
+     *
+     * Example: User logs in, SQL logs.
+     */
+    public function info(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::INFO, $message, $context);
+    }
+
+    /**
+     * Detailed debug information.
+     */
+    public function debug(string|\Stringable $message, array $context = []): void
+    {
+        $this->log(LogLevel::DEBUG, $message, $context);
+    }
+
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param mixed $level
+     *
+     * @throws \Psr\Log\InvalidArgumentException
+     */
+    abstract public function log($level, string|\Stringable $message, array $context = []): void;
+}

plugins/vendor/psr/log/src/NullLogger.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * This Logger can be used to avoid conditional log calls.
+ *
+ * Logging should always be optional, and if no logger is provided to your
+ * library creating a NullLogger instance to have something to throw logs at
+ * is a good way to avoid littering your code with `if ($this->logger) { }`
+ * blocks.
+ */
+class NullLogger extends AbstractLogger
+{
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param mixed[] $context
+     *
+     * @throws \Psr\Log\InvalidArgumentException
+     */
+    public function log($level, string|\Stringable $message, array $context = []): void
+    {
+        // noop
+    }
+}