Added paper message support

sbapp/main.py

@@ -1,6 +1,6 @@
 __debug_build__ = False
 __disable_shaders__ = True
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 __variant__ = "beta"
 
 import sys
@@ -382,6 +382,35 @@ class SidebandApp(MDApp):
 
         self.check_bluetooth_permissions()
 
+    def on_new_intent(self, intent):
+        RNS.log("Received intent", RNS.LOG_DEBUG)
+        intent_action = intent.getAction()
+        action = None
+        data = None
+
+        if intent_action == "android.intent.action.WEB_SEARCH":
+            SearchManager = autoclass('android.app.SearchManager')
+            data = intent.getStringExtra(SearchManager.QUERY)
+            
+            if data.lower().startswith(LXMF.LXMessage.URI_SCHEMA):
+                action = "lxm_uri"
+
+        if intent_action == "android.intent.action.VIEW":
+            data = intent.getData().toString()
+            if data.lower().startswith(LXMF.LXMessage.URI_SCHEMA):
+                action = "lxm_uri"
+
+        if action != None:
+            self.handle_action(action, data)
+
+    def handle_action(self, action, data):
+        if action == "lxm_uri":
+            self.ingest_lxm_uri(data)
+
+    def ingest_lxm_uri(self, lxm_uri):
+        RNS.log("Ingesting LXMF paper message from URI: "+str(lxm_uri), RNS.LOG_DEBUG)
+        self.sideband.lxm_ingest_uri(lxm_uri)
+        
     def build(self):
         FONT_PATH = self.sideband.asset_dir+"/fonts"
         if RNS.vendor.platformutils.is_darwin():
@@ -396,6 +425,9 @@ class SidebandApp(MDApp):
             activity = autoclass('org.kivy.android.PythonActivity').mActivity
             activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)
 
+            from android import activity as a_activity
+            a_activity.bind(on_new_intent=self.on_new_intent)
+
         screen = Builder.load_string(root_layout)
 
         return screen
@@ -435,6 +467,22 @@ class SidebandApp(MDApp):
             if self.conversations_view != None:
                 self.conversations_view.update()
 
+        if self.sideband.getstate("lxm_uri_ingest.result"):
+            info_text = self.sideband.getstate("lxm_uri_ingest.result")
+            self.sideband.setstate("lxm_uri_ingest.result", False)
+            ok_button = MDRectangleFlatButton(text="OK",font_size=dp(18))
+            dialog = MDDialog(
+                title="Message Scan",
+                text=info_text,
+                buttons=[ ok_button ],
+                # elevation=0,
+            )
+            def dl_ok(s):
+                dialog.dismiss()
+            
+            ok_button.bind(on_release=dl_ok)
+            dialog.open()
+
     def on_start(self):
         self.last_exit_event = time.time()
         self.root.ids.screen_manager.transition.duration = 0.25
@@ -597,6 +645,7 @@ class SidebandApp(MDApp):
         Clock.schedule_once(cb, 0.15)
 
     def open_conversation(self, context_dest):
+        self.outbound_mode_paper = False
         if self.sideband.config["propagation_by_default"]:
             self.outbound_mode_propagation = True
         else:
@@ -662,11 +711,17 @@ class SidebandApp(MDApp):
             else:
                 msg_content = self.root.ids.message_text.text
                 context_dest = self.root.ids.messages_scrollview.active_conversation
-                if self.sideband.send_message(msg_content, context_dest, self.outbound_mode_propagation):
+                if self.outbound_mode_paper:
+                    if self.sideband.paper_message(msg_content, context_dest):
                         self.root.ids.message_text.text = ""
-                    
                         self.root.ids.messages_scrollview.scroll_y = 0
                         self.jobs(0)
+                
+                elif self.sideband.send_message(msg_content, context_dest, self.outbound_mode_propagation):
+                    self.root.ids.message_text.text = ""
+                    self.root.ids.messages_scrollview.scroll_y = 0
+                    self.jobs(0)
+
                 else:
                     self.messages_view.send_error_dialog = MDDialog(
                         title="Error",
@@ -688,22 +743,33 @@ class SidebandApp(MDApp):
 
 
     def message_propagation_action(self, sender):
+        if self.outbound_mode_paper:
+            self.outbound_mode_paper = False
+            self.outbound_mode_propagation = False
+        else:
             if self.outbound_mode_propagation:
+                self.outbound_mode_paper = True
                 self.outbound_mode_propagation = False
             else:
                 self.outbound_mode_propagation = True
+                self.outbound_mode_paper = False
+
         self.update_message_widgets()
 
     def update_message_widgets(self):
         toolbar_items = self.root.ids.messages_toolbar.ids.right_actions.children
         mode_item = toolbar_items[1]
 
+        if self.outbound_mode_paper:
+            mode_item.icon = "qrcode"
+            self.root.ids.message_text.hint_text = "Paper message"
+        else:
             if not self.outbound_mode_propagation:
                 mode_item.icon = "lan-connect"
-            self.root.ids.message_text.hint_text = "Write message for direct delivery"
+                self.root.ids.message_text.hint_text = "Message for direct delivery"
             else:
                 mode_item.icon = "upload-network"
-            self.root.ids.message_text.hint_text = "Write message for propagation"
+                self.root.ids.message_text.hint_text = "Message for propagation"
                 # self.root.ids.message_text.hint_text = "Write message for delivery via propagation nodes"
     
     def key_query_action(self, sender):
@@ -791,7 +857,51 @@ class SidebandApp(MDApp):
             self.connectivity_updater.cancel()
         self.connectivity_updater = Clock.schedule_interval(cs_updater, 1.0)
 
+    def ingest_lxm_action(self, sender):
+        def cb(dt):
+            self.open_ingest_lxm_dialog(sender)
+        Clock.schedule_once(cb, 0.15)
 
+    def open_ingest_lxm_dialog(self, sender=None):
+        try:
+            cancel_button = MDRectangleFlatButton(text="Cancel",font_size=dp(18))
+            ingest_button = MDRectangleFlatButton(text="Read LXM",font_size=dp(18), theme_text_color="Custom", line_color=self.color_accept, text_color=self.color_accept)
+            
+            dialog = MDDialog(
+                title="Ingest Paper Message",
+                text="You can read LXMF paper messages into this program by scanning a QR-code containing the message with your device camera or QR-scanner app, and then opening the resulting link in Sideband.\n\nAlternatively, you can copy an [b]lxm://[/b] link from any source to your clipboard, and ingest it using the [i]Read LXM[/i] button below.",
+                buttons=[ ingest_button, cancel_button ],
+            )
+            def dl_yes(s):
+                try:
+                    lxm_uri = Clipboard.paste()
+                    if not lxm_uri.lower().startswith(LXMF.LXMessage.URI_SCHEMA+"://"):
+                        lxm_uri = LXMF.LXMessage.URI_SCHEMA+"://"+lxm_uri
+
+                    self.ingest_lxm_uri(lxm_uri)
+                    dialog.dismiss()
+
+                except Exception as e:
+                    response = "Error ingesting message from URI: "+str(e)
+                    RNS.log(response, RNS.LOG_ERROR)
+                    self.sideband.setstate("lxm_uri_ingest.result", response)
+                    dialog.dismiss()
+
+            def dl_no(s):
+                dialog.dismiss()
+
+            def dl_ds(s):
+                self.dialog_open = False
+
+            ingest_button.bind(on_release=dl_yes)
+            cancel_button.bind(on_release=dl_no)
+
+            dialog.bind(on_dismiss=dl_ds)
+            dialog.open()
+            self.dialog_open = True
+
+        except Exception as e:
+            RNS.log("Error while creating ingest LXM dialog: "+str(e), RNS.LOG_ERROR)
 
     def lxmf_sync_action(self, sender):
         def cb(dt):
@@ -921,7 +1031,7 @@ class SidebandApp(MDApp):
         self.root.ids.information_scrollview.effect_cls = ScrollEffect
         self.root.ids.information_logo.icon = self.sideband.asset_dir+"/rns_256.png"
 
-        info = "This is Sideband v"+__version__+" "+__variant__+", on RNS v"+RNS.__version__+"\n\nHumbly build using the following open components:\n\n - [b]Reticulum[/b] (MIT License)\n - [b]LXMF[/b] (MIT License)\n - [b]KivyMD[/b] (MIT License)\n - [b]Kivy[/b] (MIT License)\n - [b]Python[/b] (PSF License)"+"\n\nGo to [u][ref=link]https://unsigned.io/donate[/ref][/u] to support the project.\n\nThe Sideband app is Copyright (c) 2022 Mark Qvist / unsigned.io\n\nPermission is granted to freely share and distribute binary copies of Sideband v"+__version__+" "+__variant__+", so long as no payment or compensation is charged for said distribution or sharing.\n\nIf you were charged or paid anything for this copy of Sideband, please report it to [b]license@unsigned.io[/b].\n\nTHIS IS EXPERIMENTAL SOFTWARE - USE AT YOUR OWN RISK AND RESPONSIBILITY"
+        info = "This is Sideband v"+__version__+" "+__variant__+", on RNS v"+RNS.__version__+" and LXMF v"+LXMF.__version__+".\n\nHumbly build using the following open components:\n\n - [b]Reticulum[/b] (MIT License)\n - [b]LXMF[/b] (MIT License)\n - [b]KivyMD[/b] (MIT License)\n - [b]Kivy[/b] (MIT License)\n - [b]Python[/b] (PSF License)"+"\n\nGo to [u][ref=link]https://unsigned.io/donate[/ref][/u] to support the project.\n\nThe Sideband app is Copyright (c) 2022 Mark Qvist / unsigned.io\n\nPermission is granted to freely share and distribute binary copies of Sideband v"+__version__+" "+__variant__+", so long as no payment or compensation is charged for said distribution or sharing.\n\nIf you were charged or paid anything for this copy of Sideband, please report it to [b]license@unsigned.io[/b].\n\nTHIS IS EXPERIMENTAL SOFTWARE - USE AT YOUR OWN RISK AND RESPONSIBILITY"
         self.root.ids.information_info.text = info
         self.root.ids.information_info.bind(on_ref_press=link_exec)
         self.root.ids.screen_manager.transition.direction = "left"
@@ -1003,6 +1113,17 @@ class SidebandApp(MDApp):
                 self.sideband.config["lxmf_sync_limit"] = self.root.ids.settings_lxmf_sync_limit.active
                 self.sideband.save_configuration()
 
+            def save_print_command(sender=None, event=None):
+                in_cmd = self.root.ids.settings_print_command.text
+                if in_cmd == "":
+                    new_cmd = "lp"
+                else:
+                    new_cmd = in_cmd
+
+                self.sideband.config["print_command"] = new_cmd.strip()
+                self.root.ids.settings_print_command.text = self.sideband.config["print_command"]
+                self.sideband.save_configuration()
+
             def save_lxmf_periodic_sync(sender=None, event=None, save=True):
                 if self.root.ids.settings_lxmf_periodic_sync.active:
                     self.widget_hide(self.root.ids.lxmf_syncslider_container, False)
@@ -1029,6 +1150,13 @@ class SidebandApp(MDApp):
             self.root.ids.settings_display_name.bind(on_text_validate=save_disp_name)
             self.root.ids.settings_display_name.bind(focus=save_disp_name)
 
+            if RNS.vendor.platformutils.is_android():
+                self.widget_hide(self.root.ids.settings_print_command, True)
+            else:
+                self.root.ids.settings_print_command.text = self.sideband.config["print_command"]
+                self.root.ids.settings_print_command.bind(on_text_validate=save_print_command)
+                self.root.ids.settings_print_command.bind(focus=save_print_command)
+
             if self.sideband.config["lxmf_propagation_node"] == None:
                 prop_node_addr = ""
             else:

sbapp/sideband/core.py

@@ -120,6 +120,7 @@ class SidebandCore():
         self.identity_path = self.app_dir+"/app_storage/primary_identity"
         self.db_path       = self.app_dir+"/app_storage/sideband.db"
         self.lxmf_storage  = self.app_dir+"/app_storage/"
+        self.tmp_dir       = self.app_dir+"/app_storage/tmp"
         
         self.first_run     = True
 
@@ -130,6 +131,11 @@ class SidebandCore():
                 self.__load_config()
                 self.first_run = False
 
+            if not os.path.isdir(self.tmp_dir):
+                os.makedirs(self.tmp_dir)
+            else:
+                self.clear_tmp_dir()
+                
         except Exception as e:
             RNS.log("Error while configuring Sideband: "+str(e), RNS.LOG_ERROR)
 
@@ -165,6 +171,12 @@ class SidebandCore():
         RNS.Transport.register_announce_handler(self)
         RNS.Transport.register_announce_handler(self.propagation_detector)
 
+    def clear_tmp_dir(self):
+        if os.path.isdir(self.tmp_dir):
+            for file in os.listdir(self.tmp_dir):
+                fpath = self.tmp_dir+"/"+file
+                os.unlink(fpath)
+
     def __init_config(self):
         RNS.log("Creating new Sideband configuration...")
         if os.path.isfile(self.identity_path):
@@ -189,6 +201,8 @@ class SidebandCore():
         self.config["lxmf_sync_interval"] = 43200
         self.config["last_lxmf_propagation_node"] = None
         self.config["nn_home_node"] = None
+        self.config["print_command"] = "lp"
+
         # Connectivity
         self.config["connect_transport"] = False
         self.config["connect_local"] = True
@@ -277,6 +291,8 @@ class SidebandCore():
             self.config["lxmf_sync_interval"] = 43200
         if not "notifications_on" in self.config:
             self.config["notifications_on"] = True
+        if not "print_command" in self.config:
+            self.config["print_command"] = "lp"
 
         if not "connect_transport" in self.config:
             self.config["connect_transport"] = False
@@ -945,7 +961,20 @@ class SidebandCore():
             return None
         else:
             entry = result[0]
-            lxm = LXMF.LXMessage.unpack_from_bytes(entry[10])
+
+            lxm_method = entry[7]
+            if lxm_method == LXMF.LXMessage.PAPER:
+                lxm_data = msgpack.unpackb(entry[10])
+                packed_lxm = lxm_data[0]
+                paper_packed_lxm = lxm_data[1]
+            else:
+                packed_lxm = entry[10]
+
+            lxm = LXMF.LXMessage.unpack_from_bytes(packed_lxm, original_method = lxm_method)
+
+            if lxm.desired_method == LXMF.LXMessage.PAPER:
+                lxm.paper_packed = paper_packed_lxm
+
             message = {
                 "hash": lxm.hash,
                 "dest": lxm.destination_hash,
@@ -980,7 +1009,19 @@ class SidebandCore():
         else:
             messages = []
             for entry in result:
-                lxm = LXMF.LXMessage.unpack_from_bytes(entry[10])
+                lxm_method = entry[7]
+                if lxm_method == LXMF.LXMessage.PAPER:
+                    lxm_data = msgpack.unpackb(entry[10])
+                    packed_lxm = lxm_data[0]
+                    paper_packed_lxm = lxm_data[1]
+                else:
+                    packed_lxm = entry[10]
+
+                lxm = LXMF.LXMessage.unpack_from_bytes(packed_lxm, original_method = lxm_method)
+                
+                if lxm.desired_method == LXMF.LXMessage.PAPER:
+                    lxm.paper_packed = paper_packed_lxm
+                
                 message = {
                     "hash": lxm.hash,
                     "dest": lxm.destination_hash,
@@ -1006,6 +1047,11 @@ class SidebandCore():
         if not lxm.packed:
             lxm.pack()
 
+        if lxm.method == LXMF.LXMessage.PAPER:
+            packed_lxm = msgpack.packb([lxm.packed, lxm.paper_packed])
+        else:
+            packed_lxm = lxm.packed
+
         query = "INSERT INTO lxm (lxm_hash, dest, source, title, tx_ts, rx_ts, state, method, t_encrypted, t_encryption, data) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
         data = (
             lxm.hash,
@@ -1018,7 +1064,7 @@ class SidebandCore():
             lxm.method,
             lxm.transport_encrypted,
             lxm.transport_encryption,
-            lxm.packed
+            packed_lxm,
         )
 
         dbc.execute(query, data)
@@ -1611,6 +1657,26 @@ class SidebandCore():
         else:
             self.lxm_ingest(message, originator=True)
 
+    def paper_message(self, content, destination_hash):
+        try:
+            if content == "":
+                raise ValueError("Message content cannot be empty")
+
+            dest_identity = RNS.Identity.recall(destination_hash)
+            dest = RNS.Destination(dest_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "lxmf", "delivery")
+            source = self.lxmf_destination
+            
+            desired_method = LXMF.LXMessage.PAPER
+            lxm = LXMF.LXMessage(dest, source, content, title="", desired_method=desired_method)
+
+            self.lxm_ingest(lxm, originator=True)
+
+            return True
+
+        except Exception as e:
+            RNS.log("Error while creating paper message: "+str(e), RNS.LOG_ERROR)
+            return False
+
     def send_message(self, content, destination_hash, propagation):
         try:
             if content == "":
@@ -1665,6 +1731,30 @@ class SidebandCore():
 
         return True
 
+    def lxm_ingest_uri(self, uri):
+        local_delivery_signal = "local_delivery_occurred"
+        duplicate_signal = "duplicate_lxm"
+        ingest_result = self.message_router.ingest_lxm_uri(
+            uri,
+            signal_local_delivery=local_delivery_signal,
+            signal_duplicate=duplicate_signal
+        )
+
+        if ingest_result == False:
+            response = "The URI contained no decodable messages"
+        
+        elif ingest_result == local_delivery_signal:
+            response = "Message was decoded, decrypted successfully, and added to your conversation list."
+
+        elif ingest_result == duplicate_signal:
+            response = "The decoded message has already been processed by the LXMF Router, and will not be ingested again."
+        
+        else:
+            # TODO: Add message to sneakernet queues
+            response = "The decoded message was not addressed to your LXMF address, and has been discarded."
+
+        self.setstate("lxm_uri_ingest.result", response)
+
     def lxm_ingest(self, message, originator = False):
         should_notify = False
         is_trusted = False

sbapp/ui/helpers.py

@@ -6,6 +6,7 @@ from kivymd.uix.list import OneLineIconListItem, MDList, IconLeftWidget, IconRig
 from kivy.properties import StringProperty
 
 ts_format = "%Y-%m-%d %H:%M:%S"
+file_ts_format = "%Y_%m_%d_%H_%M_%S"
 
 def mdc(color, hue=None):
     if hue == None:
@@ -14,6 +15,7 @@ def mdc(color, hue=None):
 
 color_received = "LightGreen"
 color_delivered = "Blue"
+color_paper = "Indigo"
 color_propagated = "Indigo"
 color_failed = "Red"
 color_unknown = "Gray"

sbapp/ui/layouts.py

@@ -88,6 +88,7 @@ MDNavigationLayout:
                         ]
                     right_action_items:
                         [
+                        ['qrcode', lambda x: root.ids.screen_manager.app.ingest_lxm_action(self)],
                         ['webhook', lambda x: root.ids.screen_manager.app.connectivity_status(self)],
                         ['access-point', lambda x: root.ids.screen_manager.app.announce_now_action(self)],
                         ['email-sync', lambda x: root.ids.screen_manager.app.lxmf_sync_action(self)],
@@ -1007,6 +1008,14 @@ MDNavigationLayout:
                                 max_text_length: 32
                                 font_size: dp(24)
 
+                            MDTextField:
+                                id: settings_print_command
+                                hint_text: "Print Command"
+                                disabled: False
+                                text: ""
+                                max_text_length: 32
+                                font_size: dp(24)
+
                             MDLabel:
                                 text: ""
                                 font_style: "H6"

sbapp/ui/messages.py

@@ -16,13 +16,17 @@ from kivy.clock import Clock
 from kivymd.uix.button import MDRectangleFlatButton
 from kivymd.uix.dialog import MDDialog
 
+import os
+import plyer
+import subprocess
+import shlex
 
 if RNS.vendor.platformutils.get_platform() == "android":
-    from ui.helpers import ts_format, mdc
+    from ui.helpers import ts_format, file_ts_format, mdc
-    from ui.helpers import color_received, color_delivered, color_propagated, color_failed, color_unknown, intensity_msgs_dark, intensity_msgs_light
+    from ui.helpers import color_received, color_delivered, color_propagated, color_paper, color_failed, color_unknown, intensity_msgs_dark, intensity_msgs_light
 else:
-    from .helpers import ts_format, mdc
+    from .helpers import ts_format, file_ts_format, mdc
-    from .helpers import color_received, color_delivered, color_propagated, color_failed, color_unknown, intensity_msgs_dark, intensity_msgs_light
+    from .helpers import color_received, color_delivered, color_propagated, color_paper, color_failed, color_unknown, intensity_msgs_dark, intensity_msgs_light
 
 class ListLXMessageCard(MDCard):
 # class ListLXMessageCard(MDCard, FakeRectangularElevationBehavior):
@@ -85,6 +89,15 @@ class Messages():
                     w.heading = titlestr+"[b]Sent[/b] "+txstr+"\n[b]State[/b] Delivered"
                     m["state"] = msg["state"]
 
+                if msg["method"] == LXMF.LXMessage.PAPER:
+                    w.md_bg_color = msg_color = mdc(color_paper, intensity_msgs)
+                    txstr = time.strftime(ts_format, time.localtime(msg["sent"]))
+                    titlestr = ""
+                    if msg["title"]:
+                        titlestr = "[b]Title[/b] "+msg["title"].decode("utf-8")+"\n"
+                    w.heading = titlestr+"[b]Sent[/b] "+txstr+"\n[b]State[/b] Paper Message"
+                    m["state"] = msg["state"]
+
                 if msg["method"] == LXMF.LXMessage.PROPAGATED and msg["state"] == LXMF.LXMessage.SENT:
                     w.md_bg_color = msg_color = mdc(color_propagated, intensity_msgs)
                     txstr = time.strftime(ts_format, time.localtime(msg["sent"]))
@@ -130,6 +143,10 @@ class Messages():
                         msg_color = mdc(color_propagated, intensity_msgs)
                         heading_str = titlestr+"[b]Sent[/b] "+txstr+"\n[b]State[/b] On Propagation Net"
 
+                    elif m["method"] == LXMF.LXMessage.PAPER:
+                        msg_color = mdc(color_paper, intensity_msgs)
+                        heading_str = titlestr+"[b]Created[/b] "+txstr+"\n[b]State[/b] Paper Message"
+
                     elif m["state"] == LXMF.LXMessage.FAILED:
                         msg_color = mdc(color_failed, intensity_msgs)
                         heading_str = titlestr+"[b]Sent[/b] "+txstr+"\n[b]State[/b] Failed"
@@ -189,11 +206,139 @@ class Messages():
                 def gen_copy(msg, item):
                     def x():
                         Clipboard.copy(msg)
-                        RNS.log(str(item))
                         item.dmenu.dismiss()
 
                     return x
 
+                def gen_copy_lxm_uri(lxm, item):
+                    def x():
+                        Clipboard.copy(lxm.as_uri())
+                        item.dmenu.dismiss()
+
+                    return x
+
+                def gen_save_qr(lxm, item):
+                    if RNS.vendor.platformutils.is_android():
+                        def x():
+                            item.dmenu.dismiss()
+                        return x
+
+                    else:
+                        def x():
+                            try:
+                                qr_image = lxm.as_qr()
+                                hash_str = RNS.hexrep(lxm.hash[-2:], delimit=False)
+                                filename = "Paper_Message_"+time.strftime(file_ts_format, time.localtime(m["sent"]))+"_"+hash_str+".png"
+                                save_path = plyer.storagepath.get_downloads_dir()+"/"+filename
+                                qr_image.save(save_path)
+                                item.dmenu.dismiss()
+
+                                ok_button = MDRectangleFlatButton(text="OK",font_size=dp(18))
+                                dialog = MDDialog(
+                                    title="QR Code Saved",
+                                    text="The paper message has been saved to: "+save_path+"",
+                                    buttons=[ ok_button ],
+                                    # elevation=0,
+                                )
+                                def dl_ok(s):
+                                    dialog.dismiss()
+                                
+                                ok_button.bind(on_release=dl_ok)
+                                dialog.open()
+
+                            except Exception as e:
+                                item.dmenu.dismiss()
+                                ok_button = MDRectangleFlatButton(text="OK",font_size=dp(18))
+                                dialog = MDDialog(
+                                    title="Error",
+                                    text="Could not save the paper message QR-code to:\n\n"+save_path+"\n\n"+str(e),
+                                    buttons=[ ok_button ],
+                                    # elevation=0,
+                                )
+                                def dl_ok(s):
+                                    dialog.dismiss()
+                                
+                                ok_button.bind(on_release=dl_ok)
+                                dialog.open()
+
+                        return x
+
+                def gen_print_qr(lxm, item):
+                    if RNS.vendor.platformutils.is_android():
+                        def x():
+                            item.dmenu.dismiss()
+                        return x
+                    
+                    else:
+                        def x():
+                            try:
+                                qr_image = lxm.as_qr()
+                                qr_tmp_path = self.app.sideband.tmp_dir+"/"+str(RNS.hexrep(lxm.hash, delimit=False))
+                                qr_image.save(qr_tmp_path)
+
+                                print_command = self.app.sideband.config["print_command"]+" "+qr_tmp_path
+                                return_code = subprocess.call(shlex.split(print_command), stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+                                os.unlink(qr_tmp_path)
+
+                                item.dmenu.dismiss()
+
+                            except Exception as e:
+                                item.dmenu.dismiss()
+                                ok_button = MDRectangleFlatButton(text="OK",font_size=dp(18))
+                                dialog = MDDialog(
+                                    title="Error",
+                                    text="Could not print the paper message QR-code.\n\n"+str(e),
+                                    buttons=[ ok_button ],
+                                    # elevation=0,
+                                )
+                                def dl_ok(s):
+                                    dialog.dismiss()
+                                
+                                ok_button.bind(on_release=dl_ok)
+                                dialog.open()
+
+                        return x
+
+                if m["method"] == LXMF.LXMessage.PAPER:
+                    if RNS.vendor.platformutils.is_android():
+                        qr_save_text = "Share QR Code"
+                    else:
+                        qr_save_text = "Save QR Code"
+
+                    dm_items = [
+                        {
+                            "viewclass": "OneLineListItem",
+                            "text": "Print QR Code",
+                            "height": dp(40),
+                            "on_release": gen_print_qr(m["lxm"], item)
+                        },
+                        {
+                            "viewclass": "OneLineListItem",
+                            "text": qr_save_text,
+                            "height": dp(40),
+                            "on_release": gen_save_qr(m["lxm"], item)
+                        },
+                        {
+                            "viewclass": "OneLineListItem",
+                            "text": "Copy LXM URI",
+                            "height": dp(40),
+                            "on_release": gen_copy_lxm_uri(m["lxm"], item)
+                        },
+                        {
+                            "viewclass": "OneLineListItem",
+                            "text": "Copy message text",
+                            "height": dp(40),
+                            "on_release": gen_copy(m["content"].decode("utf-8"), item)
+                        },
+                        {
+                            "text": "Delete",
+                            "viewclass": "OneLineListItem",
+                            "height": dp(40),
+                            "on_release": gen_del(m["hash"], item)
+                        }
+                    ]
+                else:
                     dm_items = [
                         {
                             "viewclass": "OneLineListItem",