--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_mam_adhoc/mod_mam_adhoc.lua	Sun Jun 17 21:12:00 2012 +0200
@@ -0,0 +1,113 @@
+module:depends"adhoc";
+local dataforms_new = require "util.dataforms".new;
+local dm_load = require "util.datamanager".load;
+local dm_store = require "util.datamanager".store;
+local jid_split = require "util.jid".split;
+local t_insert = table.insert;
+
+local mam_prefs_form = dataforms_new{
+	title = "Archive preferences";
+	--instructions = "";
+	{
+		name = "default",
+		label = "Default storage policy",
+		type = "list-single",
+		value = {
+			{ value = "always", label = "Always" },
+			{ value = "never", label = "Never", default = true},
+			{ value = "roster", label = "Roster" },
+		},
+	};
+	{
+		name = "always",
+		label = "Always store messages to/from",
+		type = "jid-multi"
+	};
+	{
+		name = "never",
+		label = "Never store messages to/from",
+		type = "jid-multi"
+	};
+};
+
+local host = module.host;
+
+local default_attrs = {
+	always = true, [true] = "always",
+	never = false, [false] = "never",
+	roster = "roster",
+}
+
+local global_default_policy = module:get_option("default_archive_policy", false);
+local archive_store = "archive2";
+local prefs_store = archive_store .. "_prefs";
+local function get_prefs(user)
+	return dm_load(user, host, prefs_store) or
+		{ [false] = global_default_policy };
+end
+local function set_prefs(user, prefs)
+	return dm_store(user, host, prefs_store, prefs);
+end
+
+local function mam_prefs_handler(self, data, state)
+	local username, hostname = jid_split(data.from);
+	if state then -- the second return value
+		if data.action == "cancel" then
+			return { status = "canceled" };
+		end
+
+		if not username or not hostname or hostname ~= module.host then
+			return { status = "error", error = { type = "cancel",
+				condition = "forbidden", message = "Invalid user or hostname." } };
+		end
+
+		local fields = mam_prefs_form:data(data.form);
+
+		local default, always, never = fields.default, fields.always, fields.never;
+		local prefs = {};
+		if default then
+			prefs[false] = default_attrs[default];
+		end
+		if always then
+			for i=1,#always do
+				prefs[always[i]] = true;
+			end
+		end
+		if never then
+			for i=1,#never do
+				prefs[never[i]] = false;
+			end
+		end
+
+		set_prefs(username, prefs);
+
+		return { status = "completed" }
+	else -- No state, send the form.
+		local prefs = get_prefs(username);
+		local values = {
+			default = {
+				{ value = "always", label = "Always" };
+				{ value = "never", label = "Never" };
+				{ value = "roster", label = "Roster" };
+			};
+			always = {};
+			never = {};
+		};
+
+		for jid, p in pairs(prefs) do
+			if jid then
+				t_insert(values[p and "always" or "never"], jid);
+
+			elseif p == true then -- Yes, this is ugly.  FIXME later.
+				values.default[1].default = true;
+			elseif p == false then
+				values.default[2].default = true;
+			elseif p == "roster" then
+				values.default[3].default = true;
+			end
+		end
+		return { status = "executing", actions  = { "complete" }, form = { layout = mam_prefs_form, values = values } }, true;
+	end
+end
+
+module:provides("adhoc", module:require"adhoc".new("Archive settings", "mamprefs", mam_prefs_handler));