fix: Properly handle plain text attachments

mail2misp/mail2misp.py

@@ -83,7 +83,7 @@ class Mail2MISP():
                 forwarded_emails.append(self.forwarded_email(pseudofile=BytesIO(attachment_content.as_bytes())))
             else:
                 if isinstance(attachment_content, str):
-                    attachment_content = BytesIO(attachment_content.encode())
+                    attachment_content = attachment_content.encode()
                 filename = attachment.get_filename()
                 if not filename:
                     filename = 'missing_filename'

tests/mails

@@ -1 +1 @@
-Subproject commit d57c26e25f6da499a806de2b60f1861f3ed882af
+Subproject commit 58d3cfbe1355aa184e0d68fcda88ead371974574

tests/tests.py

@@ -62,5 +62,13 @@ class TestMailToMISP(unittest.TestCase):
         self.assertTrue('attachment' in [a.type for a in self.mail2misp.misp_event.attributes])
         self.assertTrue(self.mail2misp.misp_event.publish)
 
+    def test_textfile(self):
+        config = importlib.import_module('tests.config_forward')
+        self.mail2misp = Mail2MISP('', '', '', config=config, offline=True)
+        with open('tests/mails/test_textattachment.eml', 'rb') as f:
+            self.mail2misp.load_email(BytesIO(f.read()))
+        self.mail2misp.process_email_body()
+
+
 if __name__ == '__main__':
     unittest.main()