make sure __toString always delivers same result for base64 and quote…

…d printable encoding, prevents wrong dkim signatures

src/Stream/Base64EncodedStream.php

@@ -80,6 +80,7 @@ private function removeFilter(): void
      */
     public function __toString(): string
     {
+        $this->rewind();
         return $this->decoratedStream->__toString();
     }
 

src/Stream/QuotedPrintableStream.php

@@ -89,6 +89,7 @@ private function removeFilter(): void
      */
     public function __toString(): string
     {
+        $this->rewind();
         return $this->decoratedStream->__toString();
     }
 

test/Stub/BugReport/issue-30.txt

@@ -0,0 +1,15 @@
+Deze e-mail online lezen
+
+*Nieuwsbrief december 2017*
+
+Goedendag,
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur iaculis velit ac blandit
+rutrum. Donec imperdiet hendrerit placerat. Donec suscipit ut leo vel laoreet. Curabitur
+facilisis nunc ac urna laoreet finibus vitae luctus odio. Ut porttitor tempor hendrerit.
+Interdum et malesuada fames ac ante ipsum primis in faucibus. Fusce sollicitudin placerat
+scelerisque. Quisque luctus sapien quis augue malesuada, ac fringilla augue luctus. Vestibulum
+pharetra et libero at pellentesque. Sed non semper magna. Fusce auctor sit amet ex vitae euismod.
+Sed nec arcu a est molestie ullamcorper.
+
+*12 januari congres Impact van ullamcorper op auctor et ABC*

test/Unit/Stream/Base64StreamTest.php

@@ -113,4 +113,15 @@ function ($line) {
         $this->assertLessThanOrEqual(76, max($lines));
     }
 
+    /**
+     * @test
+     */
+    public function it_produces_equally_result_with_to_string_twice()
+    {
+        $stream = Base64EncodedStream::fromString(
+            file_get_contents(__DIR__.'/../../Stub/BugReport/issue-30.txt')
+        );
+
+        $this->assertEquals((string)$stream, (string)$stream);
+    }
 }

test/Unit/Stream/QuotedPrintableStreamTest.php

@@ -149,4 +149,16 @@ public function it_uses_correct_line_endings_tab()
         $this->assertEquals(str_repeat("tëst1\ttest2\r\n", 50), quoted_printable_decode($encoded));
     }
 
+    /**
+     * @test
+     */
+    public function it_produces_equally_result_with_to_string_twice()
+    {
+        $stream = QuotedPrintableStream::fromString(
+            file_get_contents(__DIR__.'/../../Stub/BugReport/issue-30.txt')
+        );
+
+        $this->assertEquals((string)$stream, (string)$stream);
+    }
+
 }