# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1320193074 -3600
# Node ID 7fc17e40fbafe0628e872b30eb68b142d5a92ed8
# Parent  30e66eabffa902adab035adc2fbcafa380579313
plugins.carbons: Add, implements Message Carbons (XEP 280)

diff -r 30e66eabffa9 -r 7fc17e40fbaf plugins/carbons.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/carbons.lua	Wed Nov 02 01:17:54 2011 +0100
@@ -0,0 +1,58 @@
+local xmlns_carbons = "urn:xmpp:carbons:1";
+local xmlns_forward = "urn:xmpp:forward:0";
+local os_date = os.date;
+local datetime = function(t) return os_date("!%Y-%m-%dT%H:%M:%SZ", t); end
+
+-- TODO Check disco for support
+
+function verse.plugins.carbons(stream)
+	local carbons = {};
+	carbons.enabled = false;
+	stream.carbons = carbons;
+
+	function carbons:enable(callback)
+		stream:send_iq(verse.iq{type="set"}
+		:tag("enable", { xmlns = xmlns_carbons })
+		, function(result)
+			local success = result.attr.type == "result";
+			if success then
+				carbons.enabled = true;
+			end
+			if callback then
+				callback(success);
+			end
+		end or nil);
+	end
+
+	function carbons:disable(callback)
+		stream:send_iq(verse.iq{type="set"}
+		:tag("disable", { xmlns = xmlns_carbons })
+		, function(result)
+			local success = result.attr.type == "result";
+			if success then
+				carbons.enabled = false;
+			end
+			if callback then
+				callback(success);
+			end
+		end or nil);
+	end
+
+	stream:hook("message", function(stanza)
+		stream:debug(stanza);
+		local fwd = stanza:get_child("forwarded", xmlns_forward);
+		if fwd then
+			local carbon_dir = fwd:get_child(nil, xmlns_carbons);
+			carbon_dir = carbon_dir and carbon_dir.name;
+			if carbon_dir then
+				local fwd_stanza = fwd:get_child("message", "jabber:client");
+				assert(fwd_stanza, "No stanza included.\n"..tostring(stanza).."\n--\n"..tostring(fwd_stanza));
+				return stream:event("carbon", {
+					dir = carbon_dir,
+					stanza = fwd_stanza,
+					timestamp = nil or datetime(), -- TODO check for delay tag
+				});
+			end
+		end
+	end, 1);
+end