mod_blocklist: Drop blocked messages without error, option to restore compliant behavior
From XEP-0191:
> For message stanzas, the server SHOULD return an error, which SHOULD
> be <service-unavailable/>.
Following this may leak to a blocked JID that they have been blocked,
which seems contrary to the goal of pretending to be perpetually
offline.
-- Compatibility layer for bitwise operations
-- First try the bit32 lib
-- Lua 5.3 has it with compat enabled
-- Lua 5.2 has it by default
if _G.bit32 then
return _G.bit32;
else
-- Lua 5.1 may have it as a standalone module that can be installed
local ok, bitop = pcall(require, "bit32")
if ok then
return bitop;
end
end
do
-- Lua 5.3 and 5.4 would be able to use native infix operators
local ok, bitop = pcall(require, "util.bit53")
if ok then
return bitop;
end
end
do
-- Lastly, try the LuaJIT bitop library
local ok, bitop = pcall(require, "bit")
if ok then
return bitop;
end
end
error "No bit module found. See https://prosody.im/doc/depends#bitop";