Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/Mime/MimePart.php

@@ -0,0 +1,212 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * A MIME part, in a multipart message.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_Mime_MimePart extends Swift_Mime_SimpleMimeEntity
+{
+    /** The format parameter last specified by the user */
+    protected $_userFormat;
+
+    /** The charset last specified by the user */
+    protected $_userCharset;
+
+    /** The delsp parameter last specified by the user */
+    protected $_userDelSp;
+
+    /** The nesting level of this MimePart */
+    private $_nestingLevel = self::LEVEL_ALTERNATIVE;
+
+    /**
+     * Create a new MimePart with $headers, $encoder and $cache.
+     *
+     * @param Swift_Mime_HeaderSet      $headers
+     * @param Swift_Mime_ContentEncoder $encoder
+     * @param Swift_KeyCache            $cache
+     * @param Swift_Mime_Grammar        $grammar
+     * @param string                    $charset
+     */
+    public function __construct(Swift_Mime_HeaderSet $headers, Swift_Mime_ContentEncoder $encoder, Swift_KeyCache $cache, Swift_Mime_Grammar $grammar, $charset = null)
+    {
+        parent::__construct($headers, $encoder, $cache, $grammar);
+        $this->setContentType('text/plain');
+        if (null !== $charset) {
+            $this->setCharset($charset);
+        }
+    }
+
+    /**
+     * Set the body of this entity, either as a string, or as an instance of
+     * {@link Swift_OutputByteStream}.
+     *
+     * @param mixed  $body
+     * @param string $contentType optional
+     * @param string $charset     optional
+     *
+     * @return $this
+     */
+    public function setBody($body, $contentType = null, $charset = null)
+    {
+        if (isset($charset)) {
+            $this->setCharset($charset);
+        }
+        $body = $this->_convertString($body);
+
+        parent::setBody($body, $contentType);
+
+        return $this;
+    }
+
+    /**
+     * Get the character set of this entity.
+     *
+     * @return string
+     */
+    public function getCharset()
+    {
+        return $this->_getHeaderParameter('Content-Type', 'charset');
+    }
+
+    /**
+     * Set the character set of this entity.
+     *
+     * @param string $charset
+     *
+     * @return $this
+     */
+    public function setCharset($charset)
+    {
+        $this->_setHeaderParameter('Content-Type', 'charset', $charset);
+        if ($charset !== $this->_userCharset) {
+            $this->_clearCache();
+        }
+        $this->_userCharset = $charset;
+        parent::charsetChanged($charset);
+
+        return $this;
+    }
+
+    /**
+     * Get the format of this entity (i.e. flowed or fixed).
+     *
+     * @return string
+     */
+    public function getFormat()
+    {
+        return $this->_getHeaderParameter('Content-Type', 'format');
+    }
+
+    /**
+     * Set the format of this entity (flowed or fixed).
+     *
+     * @param string $format
+     *
+     * @return $this
+     */
+    public function setFormat($format)
+    {
+        $this->_setHeaderParameter('Content-Type', 'format', $format);
+        $this->_userFormat = $format;
+
+        return $this;
+    }
+
+    /**
+     * Test if delsp is being used for this entity.
+     *
+     * @return bool
+     */
+    public function getDelSp()
+    {
+        return 'yes' == $this->_getHeaderParameter('Content-Type', 'delsp') ? true : false;
+    }
+
+    /**
+     * Turn delsp on or off for this entity.
+     *
+     * @param bool $delsp
+     *
+     * @return $this
+     */
+    public function setDelSp($delsp = true)
+    {
+        $this->_setHeaderParameter('Content-Type', 'delsp', $delsp ? 'yes' : null);
+        $this->_userDelSp = $delsp;
+
+        return $this;
+    }
+
+    /**
+     * Get the nesting level of this entity.
+     *
+     * @see LEVEL_TOP, LEVEL_ALTERNATIVE, LEVEL_MIXED, LEVEL_RELATED
+     *
+     * @return int
+     */
+    public function getNestingLevel()
+    {
+        return $this->_nestingLevel;
+    }
+
+    /**
+     * Receive notification that the charset has changed on this document, or a
+     * parent document.
+     *
+     * @param string $charset
+     */
+    public function charsetChanged($charset)
+    {
+        $this->setCharset($charset);
+    }
+
+    /** Fix the content-type and encoding of this entity */
+    protected function _fixHeaders()
+    {
+        parent::_fixHeaders();
+        if (count($this->getChildren())) {
+            $this->_setHeaderParameter('Content-Type', 'charset', null);
+            $this->_setHeaderParameter('Content-Type', 'format', null);
+            $this->_setHeaderParameter('Content-Type', 'delsp', null);
+        } else {
+            $this->setCharset($this->_userCharset);
+            $this->setFormat($this->_userFormat);
+            $this->setDelSp($this->_userDelSp);
+        }
+    }
+
+    /** Set the nesting level of this entity */
+    protected function _setNestingLevel($level)
+    {
+        $this->_nestingLevel = $level;
+    }
+
+    /** Encode charset when charset is not utf-8 */
+    protected function _convertString($string)
+    {
+        $charset = strtolower($this->getCharset());
+        if (!in_array($charset, array('utf-8', 'iso-8859-1', 'iso-8859-15', ''))) {
+            // mb_convert_encoding must be the first one to check, since iconv cannot convert some words.
+            if (function_exists('mb_convert_encoding')) {
+                $string = mb_convert_encoding($string, $charset, 'utf-8');
+            } elseif (function_exists('iconv')) {
+                $string = iconv('utf-8//TRANSLIT//IGNORE', $charset, $string);
+            } else {
+                throw new Swift_SwiftException('No suitable convert encoding function (use UTF-8 as your charset or install the mbstring or iconv extension).');
+            }
+
+            return $string;
+        }
+
+        return $string;
+    }
+}