Add. Handler for SUBSCRIBE method for call flow application. (#1701)

* Add. Handler for SUBSCRIBE method for call flow application.

Usage:
1. Run form fs_cli `luarun call_flow_subscribe`
2. Create new call flow extension and set feature code to `flow+<EXTENSION>`(e.g. `flow+401`).
3. Set on the phone BLF key to `flow+401`

This code based on `mod_valet_parking`.

* Add. prevent running 2 copy of script.

Remove some unused vars and simplify implementation.

* Fix. Use correct protocol for send event.

* Fix. Do escape SQL arguments

* Fix. escape `+` sign in call flow extension.

resources/install/scripts/resources/functions/database.lua

@@ -77,6 +77,14 @@ local function new_database(backend, backend_name)
     return result
   end
 
+  function Database:escape(str)
+    return (string.gsub(str, "'", "''"))
+  end
+
+  function Database:quote(str)
+    return "'" .. self:escape(str) .. "'"
+  end
+
   function Database.__self_test__(...)
     log.info('self_test Database - ' ..  Database._backend_name)
     local db = Database.new(...)
@@ -151,6 +159,16 @@ local function new_database(backend, backend_name)
     local a = assert(db:first_value("select NULL as a"))
     assert(a == "")
 
+    -- escape
+    local values = {"hello';select 'world", "hello'"}
+    for _, value in ipairs(values) do
+      local a = assert(db:first_value(
+        string.format("select '%s' as a", db:escape(value))
+      ))
+      assert(a == value)
+    end
+
+    -- close
     db:release()
     assert(not db:connected())
 

resources/install/scripts/resources/functions/presence_in.lua

@@ -1,6 +1,17 @@
+require "resources.functions.split"
+
 local function turn_lamp(on, user, uuid)
+	local userid, domain, proto = split_first(user, "@", true)
+	proto, userid = split_first(userid, "+", true)
+	if userid then
+		user = userid  .. "@" .. domain
+	else
+		proto = "sip"
+	end
+
+
 	local event = freeswitch.Event("PRESENCE_IN");
-	event:addHeader("proto", "sip");
+	event:addHeader("proto", proto);
 	event:addHeader("event_type", "presence");
 	event:addHeader("alt_event_type", "dialog");
 	event:addHeader("Presence-Call-Direction", "outbound");