Message headers: skip records with unsupported characters

src/Message/Headers.php

@@ -14,7 +14,11 @@ public function __construct(\stdClass $headers)
         $headers = \array_change_key_case((array) $headers);
 
         foreach ($headers as $key => $value) {
-            $this[$key] = $this->parseHeader($key, $value);
+            try {
+                $this[$key] = $this->parseHeader($key, $value);
+            } catch (\Ddeboer\Imap\Exception\UnsupportedCharsetException $e) {
+                // safely skip header with unsupported charset
+            }
         }
     }
 

tests/MessageTest.php

@@ -1067,4 +1067,20 @@ public function testGbkCharsetDecoding(): void
 
         static::assertSame('Hi', \trim($message->getDecodedContent()));
     }
+
+    public function testUndefinedCharset(): void
+    {
+        $this->mailbox->addMessage($this->getFixture('undefined_charset_header'));
+
+        $message = $this->mailbox->getMessage(1);
+
+        $headers = $message->getHeaders();
+
+        static::assertCount(1, $message->getTo());
+        static::assertSame('<[email protected]>', $headers['message_id']);
+        static::assertArrayNotHasKey('subject', $headers);
+        static::assertArrayNotHasKey('from', $headers);
+        static::assertNull($message->getSubject());
+        static::assertNull($message->getFrom());
+    }
 }

tests/fixtures/undefined_charset_header.eml

@@ -0,0 +1,20 @@
+X-Real-To: <[email protected]>
+X-Stored-In: BlaBla
+Return-Path: <[email protected]>
+Received: from <[email protected]>
+  by bla.bla (CommuniGate Pro RULE 6.1.13)
+  with RULE id 14057804; Mon, 27 Feb 2017 13:21:44 +0930
+X-Autogenerated: Mirror
+Resent-From: <[email protected]>
+Resent-Date: Mon, 27 Feb 2017 13:21:44 +0930
+Message-Id: <[email protected]>
+From: =?X-IAS-German?B?bXlHb3Y=?=<[email protected]>
+To: [email protected]
+Subject: =?X-IAS-German?B?U3VibWl0IHlvdXIgdGF4IHJlZnVuZCB8IEF1c3RyYWxpYW4gVGF4YXRpb24gT2ZmaWNlLg==?=
+Date: 27 Feb 2017 04:51:29 +0100
+MIME-Version: 1.0
+Content-Type: text/html;
+        charset="iso-8859-1"
+Content-Transfer-Encoding: quoted-printable
+
+)