commit vendor

vendor/laminas/laminas-mail/src/Header/HeaderValue.php

@@ -0,0 +1,116 @@
+<?php
+
+/**
+ * @see       https://github.com/laminas/laminas-mail for the canonical source repository
+ * @copyright https://github.com/laminas/laminas-mail/blob/master/COPYRIGHT.md
+ * @license   https://github.com/laminas/laminas-mail/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Laminas\Mail\Header;
+
+final class HeaderValue
+{
+    /**
+     * No public constructor.
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Filter the header value according to RFC 2822
+     *
+     * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
+     * @param  string $value
+     * @return string
+     */
+    public static function filter($value)
+    {
+        $result = '';
+        $total  = strlen($value);
+
+        // Filter for CR and LF characters, leaving CRLF + WSP sequences for
+        // Long Header Fields (section 2.2.3 of RFC 2822)
+        for ($i = 0; $i < $total; $i += 1) {
+            $ord = ord($value[$i]);
+            if ($ord === 10 || $ord > 127) {
+                continue;
+            }
+
+            if ($ord === 13) {
+                if ($i + 2 >= $total) {
+                    continue;
+                }
+
+                $lf = ord($value[$i + 1]);
+                $sp = ord($value[$i + 2]);
+
+                if ($lf !== 10 || $sp !== 32) {
+                    continue;
+                }
+
+                $result .= "\r\n ";
+                $i += 2;
+                continue;
+            }
+
+            $result .= $value[$i];
+        }
+
+        return $result;
+    }
+
+    /**
+     * Determine if the header value contains any invalid characters.
+     *
+     * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
+     * @param string $value
+     * @return bool
+     */
+    public static function isValid($value)
+    {
+        $total = strlen($value);
+        for ($i = 0; $i < $total; $i += 1) {
+            $ord = ord($value[$i]);
+
+            // bare LF means we aren't valid
+            if ($ord === 10 || $ord > 127) {
+                return false;
+            }
+
+            if ($ord === 13) {
+                if ($i + 2 >= $total) {
+                    return false;
+                }
+
+                $lf = ord($value[$i + 1]);
+                $sp = ord($value[$i + 2]);
+
+                if ($lf !== 10 || ! in_array($sp, [9, 32], true)) {
+                    return false;
+                }
+
+                // skip over the LF following this
+                $i += 2;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Assert that the header value is valid.
+     *
+     * Raises an exception if invalid.
+     *
+     * @param string $value
+     * @throws Exception\RuntimeException
+     * @return void
+     */
+    public static function assertValid($value)
+    {
+        if (! self::isValid($value)) {
+            throw new Exception\RuntimeException('Invalid header value detected');
+        }
+    }
+}