Create messageboard.py

nomadnet/apps/messageboard/messageboard.py

@@ -0,0 +1,187 @@
+# Simple message board that can be hosted on a NomadNet node, messages can be posted by 'conversing' with a unique peer, all messages are then forwarded to the message board.
+# https://github.com/chengtripp/lxmf_messageboard
+
+import RNS
+import LXMF
+import os, time
+from queue import Queue
+import RNS.vendor.umsgpack as msgpack
+
+display_name = "NomadNet Message Board"
+max_messages = 20
+
+def setup_lxmf():
+    if os.path.isfile(identitypath):
+        identity = RNS.Identity.from_file(identitypath)
+        RNS.log('Loaded identity from file', RNS.LOG_INFO)
+    else:
+        RNS.log('No Primary Identity file found, creating new...', RNS.LOG_INFO)
+        identity = RNS.Identity()
+        identity.to_file(identitypath)
+
+    return identity
+
+def lxmf_delivery(message):
+    # Do something here with a received message
+    RNS.log("A message was received: "+str(message.content.decode('utf-8')))
+
+    message_content = message.content.decode('utf-8')
+    source_hash_text = RNS.hexrep(message.source_hash, delimit=False)
+
+    #Create username (just first 5 char of your addr)
+    username = source_hash_text[0:5]
+
+    RNS.log('Username: {}'.format(username), RNS.LOG_INFO)
+
+    time_string = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(message.timestamp))
+    new_message = '{} {}: {}\n'.format(time_string, username, message_content)
+
+    # Push message to board
+    # First read message board (if it exists
+    if os.path.isfile(boardpath):
+        f = open(boardpath, "rb")
+        message_board = msgpack.unpack(f)
+        f.close()
+    else:
+        message_board = []
+
+    #Check we aren't doubling up (this can sometimes happen if there is an error initially and it then gets fixed)
+    if new_message not in message_board:
+        # Append our new message to the list
+        message_board.append(new_message)
+
+    # Prune the message board if needed
+    while len(message_board) > max_messages:
+        RNS.log('Pruning Message Board')
+        message_board.pop(0)
+
+    # Now open the board and write the updated list
+    f = open(boardpath, "wb")
+    msgpack.pack(message_board, f)
+    f.close()
+
+    # Send reply
+    message_reply = '{}_{}_Your message has been added to the messageboard'.format(source_hash_text, time.time())
+    q.put(message_reply)
+
+def announce_now(lxmf_destination):
+    lxmf_destination.announce()
+
+def send_message(destination_hash, message_content):
+    try:
+      # Make a binary destination hash from a hexadecimal string
+      destination_hash = bytes.fromhex(destination_hash)
+
+    except Exception as e:
+      RNS.log("Invalid destination hash", RNS.LOG_ERROR)
+      return
+
+    # Check that size is correct
+    if not len(destination_hash) == RNS.Reticulum.TRUNCATED_HASHLENGTH//8:
+      RNS.log("Invalid destination hash length", RNS.LOG_ERROR)
+
+    else:
+      # Length of address was correct, let's try to recall the
+      # corresponding Identity
+      destination_identity = RNS.Identity.recall(destination_hash)
+
+      if destination_identity == None:
+        # No path/identity known, we'll have to abort or request one
+        RNS.log("Could not recall an Identity for the requested address. You have probably never received an announce from it. Try requesting a path from the network first. In fact, let's do this now :)", RNS.LOG_ERROR)
+        RNS.Transport.request_path(destination_hash)
+        RNS.log("OK, a path was requested. If the network knows a path, you will receive an announce with the Identity data shortly.", RNS.LOG_INFO)
+
+      else:
+        # We know the identity for the destination hash, let's
+        # reconstruct a destination object.
+        lxmf_destination = RNS.Destination(destination_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "lxmf", "delivery")
+
+        # Create a new message object
+        lxm = LXMF.LXMessage(lxmf_destination, local_lxmf_destination, message_content, title="Reply", desired_method=LXMF.LXMessage.DIRECT)
+
+        # You can optionally tell LXMF to try to send the message
+        # as a propagated message if a direct link fails
+        lxm.try_propagation_on_fail = True
+
+        # Send it
+        message_router.handle_outbound(lxm)
+
+def announce_check():
+    if os.path.isfile(announcepath):
+        f = open(announcepath, "r")
+        announce = int(f.readline())
+        f.close()
+    else:
+        RNS.log('failed to open announcepath', RNS.LOG_DEBUG)
+        announce = 1
+
+    if announce > int(time.time()):
+        RNS.log('Recent announcement', RNS.LOG_DEBUG)
+    else:
+        f = open(announcepath, "w")
+        next_announce = int(time.time()) + 1800
+        f.write(str(next_announce))
+        f.close()
+        announce_now(local_lxmf_destination)
+        RNS.log('Announcement sent, expr set 1800 seconds', RNS.LOG_INFO)
+
+#Setup Paths and Config Files
+userdir = os.path.expanduser("~")
+
+if os.path.isdir("/etc/nomadmb") and os.path.isfile("/etc/nomadmb/config"):
+    configdir = "/etc/nomadmb"
+elif os.path.isdir(userdir+"/.config/nomadmb") and os.path.isfile(userdir+"/.config/nomadmb/config"):
+    configdir = userdir+"/.config/nomadmb"
+else:
+    configdir = userdir+"/.nomadmb"
+
+storagepath  = configdir+"/storage"
+if not os.path.isdir(storagepath):
+    os.makedirs(storagepath)
+
+identitypath = configdir+"/storage/identity"
+announcepath = configdir+"/storage/announce"
+boardpath = configdir+"/storage/board"
+
+# Message Queue
+q = Queue(maxsize = 5)
+
+# Start Reticulum and print out all the debug messages
+reticulum = RNS.Reticulum(loglevel=RNS.LOG_VERBOSE)
+
+# Create a Identity.
+current_identity = setup_lxmf()
+
+# Init the LXMF router
+message_router = LXMF.LXMRouter(identity = current_identity, storagepath = configdir)
+
+# Register a delivery destination (for yourself)
+# In this example we use the same Identity as we used
+# to instantiate the LXMF router. It could be a different one,
+# but it can also just be the same, depending on what you want.
+local_lxmf_destination = message_router.register_delivery_identity(current_identity, display_name=display_name)
+
+# Set a callback for when a message is received
+message_router.register_delivery_callback(lxmf_delivery)
+
+# Announce node properties
+
+RNS.log('LXMF Router ready to receive on: {}'.format(RNS.prettyhexrep(local_lxmf_destination.hash)), RNS.LOG_INFO)
+announce_check()
+
+while True:
+
+    # Work through internal message queue
+    for i in list(q.queue):
+        message_id = q.get()
+        split_message = message_id.split('_')
+        destination_hash = split_message[0]
+        message = split_message[2]
+        RNS.log('{} {}'.format(destination_hash, message), RNS.LOG_INFO)
+        send_message(destination_hash, message)
+
+    # Check whether we need to make another announcement
+    announce_check()
+
+    #Sleep
+    time.sleep(10)