[feat] SMTP server to send MMS

README.md

@@ -1,24 +1,29 @@
 # mms2mail
 
-Convert mmsd MMS file to mbox.
+Mail bridge for mmsd.
 
-mms2mail can convert mms in batch mode, or wait for new mms via a dbus signal
-sent by mmsd.
-By default it store them in the current user mbox (```/var/mail/$USER```) 
-in case the mbox is locked by another process the output could be found in :
-```$HOME/.mms/failsafembox```
+mms2mail: 
+* convert incoming mms from mmsd to mail and store it in unix mbox.
+* provide a smtp server converting mail to mms with mmsd.
+
+By default:
+* store mails in the current user mbox (```/var/mail/$USER```) 
+  * in case the mbox is locked by another process the output could be found in ```$HOME/.mms/failsafembox```
+* listen on localhost port 2525 for mail
 
 ## installation
 
 ### dependency
 
  - python3 
+ - python3-aiosmtpd
  - python-messaging (pip install python-messaging)
 
 ### setup
-Install the dependency and mms2mail: 
+Install the dependency and mms2mail (on debian based distribution): 
 ```
 sudo apt-get install python3
+sudo apt-get install python3-aiosmtpd
 pip install --user python-messaging
 
 mkdir -p ~/.local/bin
@@ -42,22 +47,38 @@ mailbox = /var/mail/$USER  ; the mailbox where mms are appended
 user = $USER               ; the user account specified as recipient
 domain = $HOSTNAME         ; the domain part appended to phone number and user
 attach_mms = false         ; whether to attach the full mms binary file
+
+[smtp]
+hostname = localhost
+port = 2525
 ```
 
 ## usage 
+
+### reference
 ```
-mms2mail [-h] [-d | -f FILES [FILES ...]] [--delete] [--force-read]
-                [--force-unlock] [-l {critical,error,warning,info,debug}]
+ mms2mail [-h] [-d | -f FILES [FILES ...]] [--disable-smtp] [--disable-mms-delivery] [--delete] [--force-read] [--force-unlock] [-l {critical,error,warning,info,debug}]
 
 optional arguments:
   -h, --help            show this help message and exit
-  -d, --daemon          Use dbus signal from mmsd to trigger conversion
+  -d, --daemon          start in daemon mode
   -f FILES [FILES ...], --file FILES [FILES ...]
-                        Parse specified mms files and quit
+                        Start in batch mode, parse specified mms files
+  --disable-smtp
+  --disable-mms-delivery
   --delete              Ask mmsd to delete the converted MMS
   --force-read          Force conversion even if MMS is marked as read
-  --force-unlock        BEWARE COULD LEAD TO WHOLE MBOX CORRUPTION Force unlocking the
-                        mbox after a few minutes /!\
+  --force-unlock        BEWARE COULD LEAD TO WHOLE MBOX CORRUPTION Force unlocking the mbox after a few minutes /!\
   -l {critical,error,warning,info,debug}, --logging {critical,error,warning,info,debug}
                         Define the logger output level
+```
+
+### Using with Mutt :
+To be able to send mms with mutt you need it to be built with SMTP support. 
+And and the following line in your ```$HOME/.muttrc```:
+```
+set smtp_url = "smtp://localhost:2525"
+set ssl_starttls = no
+set ssl_force_tls = no
+
 ```

TODO.md

@@ -0,0 +1,11 @@
+# mms2mail
+
+## To Do
+
+* Convert all previously received mms on start
+
+* HTML message 
+  * mms2mail : add as HTML body, currently added as attachments
+  * mail2mms : convert to text plain in case of html only mail
+
+* A lot of other things...

mms2mail

@@ -17,46 +17,67 @@ from gi.repository import GLib
 import dbus
 import dbus.mainloop.glib
 
+import os
+import re
+import tempfile
+from aiosmtpd.controller import Controller
+from email import parser
+
 log = logging.getLogger(__name__)
 
 
+class Config:
+    """Allow sharing configuration between classes."""
+
+    def __init__(self):
+        """Return the config instance."""
+        self.config = configparser.ConfigParser()
+        self.config.read(f"{Path.home()}/.mms/modemmanager/mms2mail.ini")
+
+    def get_config(self):
+        """Return the config element.
+
+        :rtype ConfigParser
+        :return The parsed configuration
+        """
+        return self.config
+
+
 class MMS2Mail:
     """
     The class handling the conversion between MMS and mail format.
 
     MMS support is provided by python-messaging
-    Mail support is provided by marrow.mailer
     """
 
-    def __init__(self, delete=False, force_read=False,
+    def __init__(self, config, delete=False, force_read=False,
                  force_unlock=False):
         """
         Return class instance.
 
+        :param config: The module configuration file
+        :type config: ConfigParser
+
         :param delete: delete MMS after conversion
         :type delete: bool
 
         :param force_read: force converting an already read MMS (batch mode)
         :type force_read: bool
 
-        :param disable_dbus: Disable sending dbus commands to mmsd (batch mode)
-        :type disable_dbus: bool
-
         :param force_unlock: Force mbox unlocking after a few minutes
         :type force_unlock: bool
         """
         self.delete = delete
         self.force_read = force_read
         self.force_unlock = force_unlock
-        self.config = configparser.ConfigParser()
-        self.config.read(f"{Path.home()}/.mms/modemmanager/mms2mail.ini")
-        self.attach_mms = self.config.getboolean('mail', 'attach_mms',
-                                                 fallback=False)
-        self.domain = self.config.get('mail', 'domain',
-                                      fallback=socket.getfqdn())
-        self.user = self.config.get('mail', 'user', fallback=getpass.getuser())
-        mbox_file = self.config.get('mail', 'mailbox',
-                                    fallback=f"/var/mail/{self.user}")
+        cfg = config.get_config()
+        self.attach_mms = cfg.getboolean('mail', 'attach_mms',
+                                         fallback=False)
+        self.domain = cfg.get('mail', 'domain',
+                              fallback=socket.getfqdn())
+        self.user = cfg.get('mail', 'user', fallback=getpass.getuser())
+        mbox_file = cfg.get('mail', 'mailbox',
+                            fallback=f"/var/mail/{self.user}")
         self.mailbox = mailbox.mbox(mbox_file)
         self.dbus = None
 
@@ -178,7 +199,8 @@ class MMS2Mail:
                 maintype, subtype = datacontent[0].split('/', 1)
                 if 'text/plain' in datacontent[0]:
                     encoding = datacontent[1].get('Charset', 'utf-8')
-                    body += data_part.data.decode(encoding) + '\n'
+                    body += data_part.data.decode(encoding,
+                                                  errors='replace') + '\n'
                     continue
                 extension = str(mimetypes.guess_extension(datacontent[0]))
                 filename = datacontent[1].get('Name', str(data_id))
@@ -246,6 +268,103 @@ class MMS2Mail:
                 self.dbus.delete_mms(dbus_path)
 
 
+class Mail2MMSHandler:
+    """The class handling the conversion between mail and MMS format."""
+
+    def __init__(self, dbusmmsd):
+        """
+        Return the Mail2MMS instance.
+
+        :param dbusmmsd: The DBus MMSd abstraction class
+        :type dbusmmsd: DbusMMSd()
+
+        :param config: The module configuration file
+        :type config: ConfigParser
+        """
+        self.parser = parser.BytesParser()
+        self.pattern = re.compile('^\+[0-9]+$')
+        self.dbusmmsd = dbusmmsd
+        mmsd_config = dbusmmsd.get_manager_config()
+        self.auto_create_smil = mmsd_config.get('AutoCreateSMIL', False)
+        self.max_attachments = mmsd_config.get('MaxAttachments', 25)
+        self.total_max_attachment_size = mmsd_config.get(
+                                                    'TotalMaxAttachmentSize',
+                                                    1100000)
+        self.use_delivery_reports = mmsd_config.get('UseDeliveryReports',
+                                                    False)
+
+    async def handle_DATA(self, server, session, envelope):
+        """
+        Handle the reception of a new mail via smtp.
+
+        :param server: The SMTP server instance
+        :type server: SMTP
+
+        :param session: The session instance currently being handled
+        :type session: Session
+
+        :param envelope: The envelope instance of the current SMTP Transaction
+        :type envelope: Envelope
+        """
+        recipients = []
+        attachments = []
+        smil = None
+        for r in envelope.rcpt_tos:
+            number = r.split('@')[0]
+            if self.pattern.search(number):
+                log.debug(f'Add recipient number : {number}')
+                recipients.append(number)
+            else:
+                log.debug(f'Ignoring recipient : {r}')
+        if len(recipients) == 0:
+            log.info('No sms recipient')
+            return '553 Requested action not taken: mailbox name not allowed'
+
+        mail = self.parser.parsebytes(envelope.content)
+        cid = 1
+        total_size = 0
+        with tempfile.TemporaryDirectory(prefix='mailtomms-') as tmp_dir:
+            for part in mail.walk():
+                content_type = part.get_content_type()
+                if 'multipart' in content_type:
+                    continue
+                filename = part.get_filename()
+                if not filename:
+                    ext = mimetypes.guess_extension(part.get_content_type())
+                    if not ext:
+                        # Use a generic bag-of-bits extension
+                        ext = '.bin'
+                    filename = f'part-{cid:03d}{ext}'
+                if filename == 'smil.xml':
+                    smil = part.get_payload(decode=True)
+                    continue
+                path = os.path.join(tmp_dir, filename)
+                if content_type == 'text/plain':
+                    with open(path, 'wt', encoding='utf-8') as af:
+                        charset = part.get_content_charset(failobj='utf-8')
+                        total_size += af.write(part.
+                                               get_payload(decode=True).
+                                               decode(charset))
+                else:
+                    with open(path, 'wb') as af:
+                        total_size += af.write(part.
+                                               get_payload(decode=True))
+                attachments.append((f"cid-{cid}", content_type, path))
+                cid += 1
+            if len(attachments) == 0:
+                return '550 No attachments found'
+            elif len(attachments) > self.max_attachments:
+                return '550 Too much attachments'
+            elif total_size > self.total_max_attachment_size:
+                return '554 5.3.4 Message too big for system'
+            try:
+                self.dbusmmsd.send_mms(recipients, attachments, smil)
+            except dbus.exceptions.DBusException as e:
+                log.error(e)
+                return '421 mmsd service not available'
+            return '250 OK'
+
+
 class DbusMMSd():
     """Use DBus communication with mmsd."""
 
@@ -297,6 +416,69 @@ class DbusMMSd():
         log.debug(f"Deleting MMS {dbus_path}")
         message.Delete()
 
+    def get_service(self):
+        """
+        Get mmsd Service Interface.
+
+        :return the mmsd service
+        :rtype dbus.Interface
+        """
+        manager = dbus.Interface(self.bus.get_object('org.ofono.mms',
+                                                     '/org/ofono/mms'),
+                                 'org.ofono.mms.Manager')
+        services = manager.GetServices()
+        path = services[0][0]
+        service = dbus.Interface(self.bus.get_object('org.ofono.mms', path),
+                                 'org.ofono.mms.Service')
+        return service
+
+    def get_manager_config(self):
+        """
+        Ask mmsd its properties.
+
+        :return the mmsd manager service properties
+        :rtype dict
+        """
+        service = self.get_service()
+        return service.GetProperties()
+
+    def send_mms(self, recipients, attachments, smil=None):
+        """
+        Ask mmsd to send a MMS.
+
+        :param recipients: The mms recipients phone numbers
+        :type recipients: Array(str)
+
+        :param attachments: The mms attachments [name, mime type, filepath]
+        :type attachments: Array(str,str,str)
+
+        :param smil: The Smil.xml content allowing MMS customization
+        :type smil: str
+        """
+        service = self.get_service()
+
+        mms_recipients = dbus.Array([], signature=dbus.Signature('s'))
+        for r in recipients:
+            mms_recipients.append(dbus.String(r))
+
+        if smil:
+            log.debug("Send MMS as Related")
+            mms_smil = dbus.String(smil)
+        else:
+            log.debug("Send MMS as Mixed")
+            mms_smil = ""
+
+        mms_attachments = dbus.Array([], signature=dbus.Signature('(sss)'))
+        for a in attachments:
+            log.debug("Attachment: ({})".format(a))
+            mms_attachments.append(dbus.Struct((dbus.String(a[0]),
+                                                dbus.String(a[1]),
+                                                dbus.String(a[2])
+                                                ), signature=None))
+
+        path = service.SendMessage(mms_recipients, mms_smil, mms_attachments)
+        log.debug(path)
+
     def add_signal_receiver(self):
         """Add a signal receiver to the current bus."""
         if self.mms2mail:
@@ -326,10 +508,15 @@ def main():
     parser = argparse.ArgumentParser()
     mode = parser.add_mutually_exclusive_group()
     mode.add_argument("-d", "--daemon",
-                      help="Use dbus signal from mmsd to trigger conversion",
-                      action='store_true', dest='watcher')
+                      help="start in daemon mode ",
+                      action='store_true', dest='daemon')
     mode.add_argument("-f", "--file", nargs='+',
-                      help="Parse specified mms files and quit", dest='files')
+                      help="Start in batch mode, parse specified mms files",
+                      dest='files')
+    parser.add_argument('--disable-smtp', action='store_true',
+                        dest='disable_smtp')
+    parser.add_argument('--disable-mms-delivery', action='store_true',
+                        dest='disable_mms_delivery')
     parser.add_argument('--delete', action='store_true', dest='delete',
                         help="Ask mmsd to delete the converted MMS")
     parser.add_argument('--force-read', action='store_true',
@@ -356,8 +543,20 @@ def main():
     ch.setFormatter(formatter)
     log.addHandler(ch)
 
+    c = Config()
     d = DbusMMSd()
-    m = MMS2Mail(delete=args.delete, force_read=args.force_read,
+
+    h = Mail2MMSHandler(dbusmmsd=d)
+
+    controller = Controller(h,
+                            hostname=c.get_config().get('smtp', 'hostname',
+                                                        fallback='localhost'),
+                            port=c.get_config().get('smtp', 'port',
+                                                    fallback=2525))
+
+    m = MMS2Mail(config=c,
+                 delete=args.delete,
+                 force_read=args.force_read,
                  force_unlock=args.force_unlock)
     m.set_dbus(d)
 
@@ -365,13 +564,21 @@ def main():
         for mms_file in args.files:
             m.convert(path=mms_file)
         return
-    elif args.watcher:
+    elif args.daemon:
         log.info("Starting mms2mail in daemon mode")
-        d.set_mms2mail(m)
-        d.add_signal_receiver()
+        if not args.disable_smtp:
+            log.info("Activating smtp to mmsd server")
+            controller.start()
+        if not args.disable_mms_delivery:
+            log.info("Activating mms to mbox server")
+            d.set_mms2mail(m)
+            d.add_signal_receiver()
     else:
         parser.print_help()
+        return
+
     d.run()
+    controller.stop()
 
 
 if __name__ == '__main__':

mms2mail.ini

@@ -3,3 +3,7 @@ mailbox = /var/mail/mobian
 account = mobian
 domain = mobian.lan
 attach_mms = false
+
+[smtp]
+hostname = localhost
+port = 2525