--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_captcha_registration/util/dataforms.lua	Sat Mar 29 22:56:24 2014 +0700
@@ -0,0 +1,256 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+-- 
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local setmetatable = setmetatable;
+local pairs, ipairs = pairs, ipairs;
+local tostring, type, next = tostring, type, next;
+local t_concat = table.concat;
+local st = require "util.stanza";
+local jid_prep = require "util.jid".prep;
+
+module "dataforms"
+
+local xmlns_forms = 'jabber:x:data';
+
+local form_t = {};
+local form_mt = { __index = form_t };
+
+function new(layout)
+	return setmetatable(layout, form_mt);
+end
+
+function form_t.form(layout, data, formtype)
+	local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype or "form" });
+	if layout.title then
+		form:tag("title"):text(layout.title):up();
+	end
+	if layout.instructions then
+		form:tag("instructions"):text(layout.instructions):up();
+	end
+	for n, field in ipairs(layout) do
+		local field_type = field.type or "text-single";
+		-- Add field tag
+		form:tag("field", { type = field_type, var = field.name, label = field.label });
+
+		local value = (data and data[field.name]) or field.value;
+		
+		if value then
+			-- Add value, depending on type
+			if field_type == "hidden" then
+				if type(value) == "table" then
+					-- Assume an XML snippet
+					form:tag("value")
+						:add_child(value)
+						:up();
+				else
+					form:tag("value"):text(tostring(value)):up();
+				end
+			elseif field_type == "boolean" then
+				form:tag("value"):text((value and "1") or "0"):up();
+			elseif field_type == "fixed" then
+				form:tag("value"):text(value):up();
+			elseif field_type == "jid-multi" then
+				for _, jid in ipairs(value) do
+					form:tag("value"):text(jid):up();
+				end
+			elseif field_type == "jid-single" then
+				form:tag("value"):text(value):up();
+			elseif field_type == "text-single" or field_type == "text-private" then
+				form:tag("value"):text(value):up();
+			elseif field_type == "text-multi" then
+				-- Split into multiple <value> tags, one for each line
+				for line in value:gmatch("([^\r\n]+)\r?\n*") do
+					form:tag("value"):text(line):up();
+				end
+			elseif field_type == "list-single" then
+				local has_default = false;
+				for _, val in ipairs(value) do
+					if type(val) == "table" then
+						form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
+						if val.default and (not has_default) then
+							form:tag("value"):text(val.value):up();
+							has_default = true;
+						end
+					else
+						form:tag("option", { label= val }):tag("value"):text(tostring(val)):up():up();
+					end
+				end
+			elseif field_type == "list-multi" then
+				for _, val in ipairs(value) do
+					if type(val) == "table" then
+						form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
+						if val.default then
+							form:tag("value"):text(val.value):up();
+						end
+					else
+						form:tag("option", { label= val }):tag("value"):text(tostring(val)):up():up();
+					end
+				end
+			elseif field_type == "media" then
+				form:tag("media", { xmlns = "urn:xmpp:media-element" });
+				for _, val in ipairs(value) do
+					form:tag("uri", { type = val.type }):text(val.uri):up()
+				end
+				form:up();
+			end
+		end
+		
+		if field.required then
+			form:tag("required"):up();
+		end
+		
+		-- Jump back up to list of fields
+		form:up();
+	end
+	return form;
+end
+
+local field_readers = {};
+
+function form_t.data(layout, stanza)
+	local data = {};
+	local errors = {};
+
+	for _, field in ipairs(layout) do
+		local tag;
+		for field_tag in stanza:childtags() do
+			if field.name == field_tag.attr.var then
+				tag = field_tag;
+				break;
+			end
+		end
+
+		if not tag then
+			if field.required then
+				errors[field.name] = "Required value missing";
+			end
+		else
+			local reader = field_readers[field.type];
+			if reader then
+				data[field.name], errors[field.name] = reader(tag, field.required);
+			end
+		end
+	end
+	if next(errors) then
+		return data, errors;
+	end
+	return data;
+end
+
+field_readers["text-single"] =
+	function (field_tag, required)
+		local data = field_tag:get_child_text("value");
+		if data and #data > 0 then
+			return data
+		elseif required then
+			return nil, "Required value missing";
+		end
+	end
+
+field_readers["text-private"] =
+	field_readers["text-single"];
+
+field_readers["jid-single"] =
+	function (field_tag, required)
+		local raw_data = field_tag:get_child_text("value")
+		local data = jid_prep(raw_data);
+		if data and #data > 0 then
+			return data
+		elseif raw_data then
+			return nil, "Invalid JID: " .. raw_data;
+		elseif required then
+			return nil, "Required value missing";
+		end
+	end
+
+field_readers["jid-multi"] =
+	function (field_tag, required)
+		local result = {};
+		local err = {};
+		for value_tag in field_tag:childtags("value") do
+			local raw_value = value_tag:get_text();
+			local value = jid_prep(raw_value);
+			result[#result+1] = value;
+			if raw_value and not value then
+				err[#err+1] = ("Invalid JID: " .. raw_value);
+			end
+		end
+		if #result > 0 then
+			return result, (#err > 0 and t_concat(err, "\n") or nil);
+		elseif required then
+			return nil, "Required value missing";
+		end
+	end
+
+field_readers["list-multi"] =
+	function (field_tag, required)
+		local result = {};
+		for value in field_tag:childtags("value") do
+			result[#result+1] = value:get_text();
+		end
+		if #result > 0 then
+			return result;
+		elseif required then
+			return nil, "Required value missing";
+		end
+	end
+
+field_readers["text-multi"] =
+	function (field_tag, required)
+		local data, err = field_readers["list-multi"](field_tag, required);
+		if data then
+			data = t_concat(data, "\n");
+		end
+		return data, err;
+	end
+
+field_readers["list-single"] =
+	field_readers["text-single"];
+
+local boolean_values = {
+	["1"] = true, ["true"] = true,
+	["0"] = false, ["false"] = false,
+};
+
+field_readers["boolean"] =
+	function (field_tag, required)
+		local raw_value = field_tag:get_child_text("value");
+		local value = boolean_values[raw_value ~= nil and raw_value];
+		if value ~= nil then
+			return value;
+		elseif raw_value then
+			return nil, "Invalid boolean representation";
+		elseif required then
+			return nil, "Required value missing";
+		end
+	end
+
+field_readers["hidden"] =
+	function (field_tag)
+		return field_tag:get_child_text("value");
+	end
+
+field_readers["media"] = field_readers["text-single"]
+
+return _M;
+
+
+--[=[
+
+Layout:
+{
+
+	title = "MUC Configuration",
+	instructions = [[Use this form to configure options for this MUC room.]],
+
+	{ name = "FORM_TYPE", type = "hidden", required = true };
+	{ name = "field-name", type = "field-type", required = false };
+}
+
+
+--]=]