Workaround for prosody PEP support in group chat with OMEMO

image_build/mod_omemo_all_access.lua

@@ -0,0 +1,55 @@
+-- OMEMO all access module
+-- Copyright (c) 2017 Daniel Gultsch
+--
+-- This module is MIT/X11 licensed
+--
+
+local jid_bare = require "util.jid".bare;
+local st = require "util.stanza"
+local white_listed_namespace = "eu.siacs.conversations.axolotl."
+local disco_feature_namespace = white_listed_namespace .. "whitelisted"
+
+local mod_pep = module:depends"pep";
+local pep_data = mod_pep.module.save().data;
+
+local function on_account_disco_info(event)
+	(event.reply or event.stanza):tag("feature", {var=disco_feature_namespace}):up();
+end
+
+local function on_pep_request(event)
+	local session, stanza = event.origin, event.stanza
+	local payload = stanza.tags[1];
+	if stanza.attr.type == 'get' then
+		local node, requested_id;
+		payload = payload.tags[1]
+		if payload and payload.name == 'items' then
+			node = payload.attr.node
+			local item = payload.tags[1];
+			if item and item.name == 'item' then
+				requested_id = item.attr.id;
+			end 
+		end
+		if node and string.sub(node,1,string.len(white_listed_namespace)) == white_listed_namespace then
+			local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
+			local user_data = pep_data[user];
+			if user_data and user_data[node] then
+				local id, item = unpack(user_data[node]);
+				if not requested_id or id == requested_id then
+					local stanza = st.reply(stanza)
+						:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
+							:tag('items', {node=node})
+								:add_child(item)
+							:up()
+						:up();
+					session.send(stanza);
+					module:log("debug","provided access to omemo node",node)
+					return true;
+				end
+			end
+			module:log("debug","requested node was white listed", node)
+		end
+	end
+end
+
+module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", on_pep_request, 10);
+module:hook("account-disco-info", on_account_disco_info);

src/freedombone-app-xmpp

@@ -326,6 +326,43 @@ function update_prosody_modules {
         return
     fi
 
+    # This module is a workaround for OMEMO within group chat
+    # See https://github.com/iNPUTmice/omemo_all_access
+    if [ -f ~/freedombone/image_build/mod_omemo_all_access.lua ]; then
+        if [ ! -d /var/lib/prosody/prosody-modules ]; then
+            mkdir -p /var/lib/prosody/prosody-modules
+        fi
+
+        copy_omemo_all_access=1
+        if [ -f /usr/lib/prosody/modules/mod_omemo_all_access.lua ]; then
+            curr_hash=$(sha256sum /usr/lib/prosody/modules/mod_omemo_all_access.lua)
+            new_hash=$(sha256sum ~/freedombone/image_build/mod_omemo_all_access.lua)
+            if [[ "$curr_hash" == "$new_hash" ]]; then
+                copy_omemo_all_access=
+            fi
+        fi
+
+        if [ $copy_omemo_all_access ]; then
+            systemctl stop prosody
+            cp ~/freedombone/image_build/mod_omemo_all_access.lua /var/lib/prosody/prosody-modules/mod_omemo_all_access.lua
+            cp ~/freedombone/image_build/mod_omemo_all_access.lua /usr/lib/prosody/modules/mod_omemo_all_access.lua
+
+            if ! grep -q "omemo_all_access" /etc/prosody/prosody.cfg.lua; then
+                sed -i '/"pep";/a "omemo_all_access"; -- Fix for PEP with OMEMO' /etc/prosody/prosody.cfg.lua
+                sed -i 's|"omemo_all_access";|  "omemo_all_access";|g' /etc/prosody/prosody.cfg.lua
+            fi
+
+            if ! grep -q "omemo_all_access" /etc/prosody/conf.avail/xmpp.cfg.lua; then
+                sed -i '/"pep";/a "omemo_all_access"; -- Fix for PEP with OMEMO' /etc/prosody/conf.avail/xmpp.cfg.lua
+                sed -i 's|"omemo_all_access";|  "omemo_all_access";|g' /etc/prosody/conf.avail/xmpp.cfg.lua
+            fi
+
+            chown -R prosody:prosody /var/lib/prosody/prosody-modules
+            chown -R prosody:prosody /usr/lib/prosody/modules
+            systemctl start prosody
+        fi
+    fi
+
     if [ ! -f $INSTALL_DIR/$prosody_modules_filename ]; then
         # Obtain the modules
         if [ -f ~/freedombone/image_build/$prosody_modules_filename ]; then
@@ -624,6 +661,7 @@ function xmpp_modules {
     echo '  "smacks"; -- Stream management' >> $filename
     echo '  "smacks_offline"; -- Stream management' >> $filename
     echo '  "pep"; -- Personal Eventing Protocol (to support OMEMO)' >> $filename
+    echo '  "omemo_all_access"; -- Fix for PEP with OMEMO' >> $filename
     echo '  "vcard"; -- Personal Eventing Protocol (to support OMEMO)' >> $filename
     echo '  "e2e_policy"; -- To support OMEMO' >> $filename
     echo '  "pep_vcard_avatar"; -- Personal Eventing Protocol (to support OMEMO)' >> $filename