mod_compression: Remove and replace with placeholder that logs an error

1 files changed, 3 insertions, 192 deletions

diff --git a/plugins/mod_compression.lua b/plugins/mod_compression.lua
index d49e3880..17be2ef2 100644
--- a/plugins/mod_compression.lua
+++ b/plugins/mod_compression.lua
@@ -1,198 +1,9 @@
 -- Prosody IM
--- Copyright (C) 2009-2012 Tobias Markmann
+-- Copyright (C) 2016 Matthew Wild
 --
 -- This project is MIT/X11 licensed. Please see the
 -- COPYING file in the source package for more information.
 --
 
-local st = require "util.stanza";
-local zlib = require "zlib";
-local pcall = pcall;
-local tostring = tostring;
-
-local xmlns_compression_feature = "http://jabber.org/features/compress"
-local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
-local xmlns_stream = "http://etherx.jabber.org/streams";
-local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
-local add_filter = require "util.filters".add_filter;
-
-local compression_level = module:get_option_number("compression_level", 7);
-
-if not compression_level or compression_level < 1 or compression_level > 9 then
-	module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
-	module:log("warn", "Module loading aborted. Compression won't be available.");
-	return;
-end
-
-module:hook("stream-features", function(event)
-	local origin, features = event.origin, event.features;
-	if not origin.compressed and origin.type == "c2s" then
-		features:add_child(compression_stream_feature);
-	end
-end);
-
-module:hook("s2s-stream-features", function(event)
-	local origin, features = event.origin, event.features;
-	if not origin.compressed and origin.type == "s2sin" then
-		features:add_child(compression_stream_feature);
-	end
-end);
-
--- Hook to activate compression if remote server supports it.
-module:hook_stanza(xmlns_stream, "features",
-		function (session, stanza)
-			if not session.compressed and session.type == "s2sout" then
-				-- does remote server support compression?
-				local comp_st = stanza:get_child("compression", xmlns_compression_feature);
-				if comp_st then
-					-- do we support the mechanism
-					for a in comp_st:childtags("method") do
-						local algorithm = a:get_text();
-						if algorithm == "zlib" then
-							session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
-							session.log("debug", "Enabled compression using zlib.")
-							return true;
-						end
-					end
-					session.log("debug", "Remote server supports no compression algorithm we support.")
-				end
-			end
-		end
-, 250);
-
-
--- returns either nil or a fully functional ready to use inflate stream
-local function get_deflate_stream(session)
-	local status, deflate_stream = pcall(zlib.deflate, compression_level);
-	if status == false then
-		local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
-		(session.sends2s or session.send)(error_st);
-		session.log("error", "Failed to create zlib.deflate filter.");
-		module:log("error", "%s", tostring(deflate_stream));
-		return
-	end
-	return deflate_stream
-end
-
--- returns either nil or a fully functional ready to use inflate stream
-local function get_inflate_stream(session)
-	local status, inflate_stream = pcall(zlib.inflate);
-	if status == false then
-		local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
-		(session.sends2s or session.send)(error_st);
-		session.log("error", "Failed to create zlib.inflate filter.");
-		module:log("error", "%s", tostring(inflate_stream));
-		return
-	end
-	return inflate_stream
-end
-
--- setup compression for a stream
-local function setup_compression(session, deflate_stream)
-	add_filter(session, "bytes/out", function(t)
-		local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
-		if status == false then
-			module:log("warn", "%s", tostring(compressed));
-			session:close({
-				condition = "undefined-condition";
-				text = compressed;
-				extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
-			});
-			return;
-		end
-		return compressed;
-	end);
-end
-
--- setup decompression for a stream
-local function setup_decompression(session, inflate_stream)
-	add_filter(session, "bytes/in", function(data)
-		local status, decompressed, eof = pcall(inflate_stream, data);
-		if status == false then
-			module:log("warn", "%s", tostring(decompressed));
-			session:close({
-				condition = "undefined-condition";
-				text = decompressed;
-				extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
-			});
-			return;
-		end
-		return decompressed;
-	end);
-end
-
-module:hook("stanza/http://jabber.org/protocol/compress:compressed", function(event)
-	local session = event.origin;
-	
-	if session.type == "s2sout" then
-		session.log("debug", "Activating compression...")
-		-- create deflate and inflate streams
-		local deflate_stream = get_deflate_stream(session);
-		if not deflate_stream then return true; end
-
-		local inflate_stream = get_inflate_stream(session);
-		if not inflate_stream then return true; end
-
-		-- setup compression for session.w
-		setup_compression(session, deflate_stream);
-
-		-- setup decompression for session.data
-		setup_decompression(session, inflate_stream);
-		session:reset_stream();
-		session:open_stream(session.from_host, session.to_host);
-		session.compressed = true;
-		return true;
-	end
-end);
-
-module:hook("stanza/http://jabber.org/protocol/compress:failure", function(event)
-	local err = event.stanza:get_child();
-	(event.origin.log or module._log)("warn", "Compression setup failed (%s)", err and err.name or "unknown reason");
-	return true;
-end);
-
-module:hook("stanza/http://jabber.org/protocol/compress:compress", function(event)
-	local session, stanza = event.origin, event.stanza;
-
-	if session.type == "c2s" or session.type == "s2sin" then
-		-- fail if we are already compressed
-		if session.compressed then
-			local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
-			(session.sends2s or session.send)(error_st);
-			session.log("debug", "Client tried to establish another compression layer.");
-			return true;
-		end
-
-		-- checking if the compression method is supported
-		local method = stanza:get_child_text("method");
-		if method == "zlib" then
-			session.log("debug", "zlib compression enabled.");
-
-			-- create deflate and inflate streams
-			local deflate_stream = get_deflate_stream(session);
-			if not deflate_stream then return true; end
-
-			local inflate_stream = get_inflate_stream(session);
-			if not inflate_stream then return true; end
-
-			(session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
-			session:reset_stream();
-
-			-- setup compression for session.w
-			setup_compression(session, deflate_stream);
-
-			-- setup decompression for session.data
-			setup_decompression(session, inflate_stream);
-
-			session.compressed = true;
-		elseif method then
-			session.log("debug", "%s compression selected, but we don't support it.", tostring(method));
-			local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
-			(session.sends2s or session.send)(error_st);
-		else
-			(session.sends2s or session.send)(st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"));
-		end
-		return true;
-	end
-end);
-
+-- COMPAT w/ pre-0.10 configs
+error("mod_compression has been removed in Prosody 0.10+. Please see https://prosody.im/doc/modules/mod_compression for more information.");