--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_captcha_registration/modules/mod_register.lua	Sat Mar 29 22:56:24 2014 +0700
@@ -0,0 +1,389 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+-- Modifications copyright (C) 2014 mrDoctorWho
+-- 
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+
+local st = require "util.stanza";
+local dataform_new = require "util.dataforms".new;
+local usermanager_user_exists = require "core.usermanager".user_exists;
+local usermanager_create_user = require "core.usermanager".create_user;
+local usermanager_set_password = require "core.usermanager".set_password;
+local usermanager_delete_user = require "core.usermanager".delete_user;
+local os_time = os.time;
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local jid_bare = require "util.jid".bare;
+local timer = require "util.timer";
+
+
+local math = require "math";
+local captcha = require "captcha";
+
+
+
+local base64 = require "util.encodings".base64.encode;
+local sha1 = require "util.hashes".sha1;
+
+
+local captcha_ids = {};
+
+local config = module:get_option("captcha_config") or {};
+
+
+local compat = module:get_option_boolean("registration_compat", true);
+local allow_registration = module:get_option_boolean("allow_registration", false);
+local additional_fields = module:get_option("additional_registration_fields", {});
+
+local account_details = module:open_store("account_details");
+
+local field_map = {
+	username = { name = "username", type = "text-single", label = "Username", required = true };
+	password = { name = "password", type = "text-private", label = "Password", required = true };
+	nick = { name = "nick", type = "text-single", label = "Nickname" };
+	name = { name = "name", type = "text-single", label = "Full Name" };
+	first = { name = "first", type = "text-single", label = "Given Name" };
+	last = { name = "last", type = "text-single", label = "Family Name" };
+	email = { name = "email", type = "text-single", label = "Email" };
+	address = { name = "address", type = "text-single", label = "Street" };
+	city = { name = "city", type = "text-single", label = "City" };
+	state = { name = "state", type = "text-single", label = "State" };
+	zip = { name = "zip", type = "text-single", label = "Postal code" };
+	phone = { name = "phone", type = "text-single", label = "Telephone number" };
+	url = { name = "url", type = "text-single", label = "Webpage" };
+	date = { name = "date", type = "text-single", label = "Birth date" };
+
+	-- something new
+	formtype = { name = "FORM_TYPE", type = "hidden"};
+	captcha_text = { name = "captcha_text", type = "fixed", label = "Warning: "};
+	captcha_psi = { name = "captchahidden", type = "hidden" }; -- Don't know exactly why, but it exists in ejabberd register form
+	captcha_url = { name = "url", type = "text-single", label = "Captcha url"};
+	from = { name = "from", type = "hidden" };
+	captcha_challenge = { name = "challenge", type = "hidden" };
+	sid = { name = "sid", type = "hidden" };
+	ocr = { name = "ocr", label = "Enter shown text", required = true, type = "media" }
+};
+
+local registration_form = dataform_new{
+
+	field_map.formtype;
+	field_map.username;
+	field_map.password;
+	field_map.captcha_text;
+--	field_map.captcha_psi; -- Maybe later, i really have no idea why it used in ejabberd reg form
+	field_map.captcha_url;
+	field_map.from;
+	field_map.captcha_challenge;
+	field_map.sid;
+	field_map.ocr;
+};
+
+
+function delete_captcha(cid)
+	os.remove(string.format("%s/%s.png", config.dir, cid))
+	captcha_ids[cid] = nil;
+end
+
+for _, field in ipairs(additional_fields) do
+	if type(field) == "table" then
+		registration_form[#registration_form + 1] = field;
+	else
+		if field:match("%+$") then
+			field = field:sub(1, #field - 1);
+			field_map[field].required = true;
+		end
+
+		registration_form[#registration_form + 1] = field_map[field];
+		registration_query:tag(field):up();
+	end
+end
+
+module:add_feature("jabber:iq:register");
+
+local register_stream_feature = st.stanza("register", {xmlns="http://jabber.org/features/iq-register"}):up();
+module:hook("stream-features", function(event)
+        local session, features = event.origin, event.features;
+
+	-- Advertise registration to unauthorized clients only.
+	if not(allow_registration) or session.type ~= "c2s_unauthed" then
+		return
+	end
+
+	features:add_child(register_stream_feature);
+end);
+
+local function handle_registration_stanza(event)
+	local session, stanza = event.origin, event.stanza;
+
+	local query = stanza.tags[1];
+	if stanza.attr.type == "get" then
+		local reply = st.reply(stanza);
+		reply:tag("query", {xmlns = "jabber:iq:register"})
+			:tag("registered"):up()
+			:tag("username"):text(session.username):up()
+			:tag("password"):up();
+		session.send(reply);
+	else -- stanza.attr.type == "set"
+		if query.tags[1] and query.tags[1].name == "remove" then
+			local username, host = session.username, session.host;
+
+			local old_session_close = session.close;
+			session.close = function(session, ...)
+				session.send(st.reply(stanza));
+				return old_session_close(session, ...);
+			end
+			
+			local ok, err = usermanager_delete_user(username, host);
+			
+			if not ok then
+				module:log("debug", "Removing user account %s@%s failed: %s", username, host, err);
+				session.close = old_session_close;
+				session.send(st.error_reply(stanza, "cancel", "service-unavailable", err));
+				return true;
+			end
+			
+			module:log("info", "User removed their account: %s@%s", username, host);
+			module:fire_event("user-deregistered", { username = username, host = host, source = "mod_register", session = session });
+		else
+			local username = nodeprep(query:get_child("username"):get_text());
+			local password = query:get_child("password"):get_text();
+			if username and password then
+				if username == session.username then
+					if usermanager_set_password(username, password, session.host) then
+						session.send(st.reply(stanza));
+					else
+						-- TODO unable to write file, file may be locked, etc, what's the correct error?
+						session.send(st.error_reply(stanza, "wait", "internal-server-error"));
+					end
+				else
+					session.send(st.error_reply(stanza, "modify", "bad-request"));
+				end
+			else
+				session.send(st.error_reply(stanza, "modify", "bad-request"));
+			end
+		end
+	end
+	return true;
+end
+
+module:hook("iq/self/jabber:iq:register:query", handle_registration_stanza);
+if compat then
+	module:hook("iq/host/jabber:iq:register:query", function (event)
+		local session, stanza = event.origin, event.stanza;
+		if session.type == "c2s" and jid_bare(stanza.attr.to) == session.host then
+			return handle_registration_stanza(event);
+		end
+	end);
+end
+
+local function parse_response(query)
+	local form = query:get_child("x", "jabber:x:data");
+	if form then
+		return registration_form:data(form);
+	else
+		local data = {};
+		local errors = {};
+		for _, field in ipairs(registration_form) do
+			local name, required = field.name, field.required;
+			if field_map[name] then
+				data[name] = query:get_child_text(name);
+				if (not data[name] or #data[name] == 0) and required then
+					errors[name] = "Required value missing";
+				end
+			end
+		end
+		if next(errors) then
+			return data, errors;
+		end
+		return data;
+	end
+end
+
+local recent_ips = {};
+local min_seconds_between_registrations = module:get_option("min_seconds_between_registrations");
+local whitelist_only = module:get_option("whitelist_registration_only");
+local whitelisted_ips = module:get_option("registration_whitelist") or { "127.0.0.1" };
+local blacklisted_ips = module:get_option("registration_blacklist") or {};
+
+for _, ip in ipairs(whitelisted_ips) do whitelisted_ips[ip] = true; end
+for _, ip in ipairs(blacklisted_ips) do blacklisted_ips[ip] = true; end
+
+
+local function get_file(name)
+	local file = io.open(name, "rb")
+	local data = file:read("*all")
+	file:close()
+	return data
+end
+
+
+local function get_captcha()
+	local cap = captcha.new();
+	math.randomseed(os_time());
+	local cid = tostring(math.random(1000, 90000)); -- random cid used for cap name
+	cap:font(config.font);
+	cap:scribble();
+	captcha_ids[cid] = cap:write(string.format("%s/%s.png", config.dir, cid)):lower();
+	timer.add_task(config.timeout, function() delete_captcha(cid) end); -- Add new function to use arguments. Is there any other way in lua? Or it even works?
+	return cid
+end
+
+
+
+module:hook("stanza/iq/jabber:iq:register:query", function(event)
+	local session, stanza = event.origin, event.stanza;
+
+	if not(allow_registration) or session.type ~= "c2s_unauthed" then
+		session.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+	else
+		local query = stanza.tags[1];
+		if stanza.attr.type == "get" then
+			local reply = st.reply(stanza):query("jabber:iq:register");
+			-- TODO: Move this in standalone function
+			local challenge = get_captcha()
+			local captcha_data = get_file(config.dir.."/"..challenge..".png")
+			local captcha_sha = sha1(captcha_data, true) -- omg
+			local captcha_base64 = base64(captcha_data) -- lol wut
+			xml = registration_form:form(({FORM_TYPE = "urn:xmpp:captcha",
+				from = session.host,
+				ocr = {{ 
+					type = "image/png",
+					uri = string.format("cid:sha1+%s@bob.xmpp.org", captcha_sha) 
+				}};
+				url = string.format("http://%s:5280/%s/%s", session.host, config.web_path, challenge);
+				captcha_text = "If you can't see an image, follow link below";
+				challenge = challenge;
+				sid = "1";
+			}));
+
+			data = st.stanza("data", 
+				{xmlns = "urn:xmpp:bob", 
+				cid = string.format("sha1+%s@bob.xmpp.org", captcha_sha), 
+				type = "image/png", 
+				["max-age"] = config.timeout})
+			:text(captcha_base64);
+			
+			reply = reply:add_child(xml);
+			reply = reply:add_child(data);
+			session.send(reply);
+
+		elseif stanza.attr.type == "set" then
+			if query.tags[1] and query.tags[1].name == "remove" then
+				session.send(st.error_reply(stanza, "auth", "registration-required"));
+			else
+				local data, errors = parse_response(query);
+				if errors then
+					session.send(st.error_reply(stanza, "modify", "not-acceptable"));
+				else
+					-- Check that the user is not blacklisted or registering too often
+					if not session.ip then
+						module:log("debug", "User's IP not known; can't apply blacklist/whitelist");
+					elseif blacklisted_ips[session.ip] or (whitelist_only and not whitelisted_ips[session.ip]) then
+						session.send(st.error_reply(stanza, "cancel", "not-acceptable", "You are not allowed to register an account."));
+						return true;
+					elseif min_seconds_between_registrations and not whitelisted_ips[session.ip] then
+						if not recent_ips[session.ip] then
+							recent_ips[session.ip] = { time = os_time(), count = 1 };
+						else
+							local ip = recent_ips[session.ip];
+							ip.count = ip.count + 1;
+							
+							if os_time() - ip.time < min_seconds_between_registrations then
+								ip.time = os_time();
+								session.send(st.error_reply(stanza, "wait", "not-acceptable"));
+								return true;
+							end
+							ip.time = os_time();
+						end
+					end
+					local host = module.host;
+					local ocr = data.ocr:lower();
+					local challenge = data.challenge;
+					local username, password = nodeprep(data.username), data.password;
+					data.username, data.password = nil, nil; 
+
+					if challenge == nil or captcha_ids[challenge] == nil then
+						session.send(st.error_reply(stanza, "modify", "not-acceptable", "Captcha id is invalid or it has expired"));
+						delete_captcha(challenge);
+						return true;
+					elseif ocr ~= captcha_ids[challenge] then
+						session.send(st.error_reply(stanza, "modify", "not-acceptable", "Invalid captcha text"));
+						delete_captcha(challenge);
+						return true;
+					end
+					if not username or username == "" then
+						session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));
+						delete_captcha(challenge);
+						return true;
+					end
+					local user = { username = username , host = host, allowed = true }
+					module:fire_event("user-registering", user);
+					if not user.allowed then
+						delete_captcha(challenge);
+						session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is forbidden."));
+					elseif usermanager_user_exists(username, host) then
+						delete_captcha(challenge)
+						session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));
+					else
+						-- TODO unable to write file, file may be locked, etc, what's the correct error?
+						local error_reply = st.error_reply(stanza, "wait", "internal-server-error", "Failed to write data to disk.");
+						if usermanager_create_user(username, password, host) then
+							if next(data) and not account_details:set(username, data) then
+								delete_captcha(challenge);
+								usermanager_delete_user(username, host);
+								session.send(error_reply);
+								return true;
+							end
+							session.send(st.reply(stanza)); -- user created!
+							module:log("info", "User account created: %s@%s", username, host);
+							module:fire_event("user-registered", {
+								username = username, host = host, source = "mod_register",
+								session = session });
+						else
+							delete_captcha(challenge);
+							session.send(error_reply);
+						end
+					end
+				end
+			end
+		end
+	end
+	return true;
+end);
+
+function string:split(sep)
+	local sep, fields = sep or ":", {}
+	local pattern = string.format("([^%s]+)", sep)
+	self:gsub(pattern, function(c) fields[#fields+1] = c end)
+	return fields
+end
+
+
+function handle_http_request(event) 
+	local request = event.request;
+	local path = request.path;
+	local cid = path:split("/")[2];
+	if cid == nil or captcha_ids[cid] == nil then
+		return nil;
+	end
+	request.response = {
+		status_code = 200;
+		headers = {	
+			content_type = "image/png" 
+		};
+		body = get_file(string.format("%s/%s.png", config.dir, cid));
+	};
+	return request.response;
+
+
+end;
+
+module:provides("http", {
+	default_path = "/"..config.web_path;
+	route = {
+		["GET /*"] = handle_http_request;
+	};
+});
\ No newline at end of file