--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_email_pass/mod_email_pass.lua	Mon Mar 10 08:22:58 2014 +0000
@@ -0,0 +1,366 @@
+local dm_load = require "util.datamanager".load;
+local st = require "util.stanza";
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local usermanager = require "core.usermanager";
+local http = require "net.http";
+local vcard = module:require "vcard";
+local datetime = require "util.datetime";
+local timer = require "util.timer";
+local jidutil = require "util.jid";
+
+-- SMTP related params. Readed from config
+local os_time = os.time;
+local smtp = require "socket.smtp";
+local smtp_server = module:get_option_string("smtp_server", "localhost");
+local smtp_port = module:get_option_string("smtp_port", "25");
+local smtp_ssl = module:get_option_boolean("smtp_ssl", false);
+local smtp_user = module:get_option_string("smtp_username");
+local smtp_pass = module:get_option_string("smtp_password");
+local smtp_address = module:get_option("smtp_from") or ((smtp_user or "no-responder").."@"..(smtp_server or module.host));
+local mail_subject = module:get_option_string("msg_subject")
+local mail_body = module:get_option_string("msg_body");
+local url_path = module:get_option_string("url_path", "/resetpass");
+
+
+-- This table has the tokens submited by the server
+tokens_mails = {};
+tokens_expiration = {};
+
+-- URL 
+local https_host = module:get_option_string("https_host");
+local http_host = module:get_option_string("http_host");
+local https_port = module:get_option("https_ports", { 443 });
+local http_port = module:get_option("http_ports", { 80 });
+
+local timer_repeat = 120;		-- repeat after 120 secs
+
+function enablessl()
+    local sock = socket.tcp()
+    return setmetatable({
+        connect = function(_, host, port)
+            local r, e = sock:connect(host, port)
+            if not r then return r, e end
+            sock = ssl.wrap(sock, {mode='client', protocol='tlsv1'})
+            return sock:dohandshake()
+        end
+    }, {
+        __index = function(t,n)
+            return function(_, ...)
+                return sock[n](sock, ...)
+            end
+        end
+    })
+end
+
+function template(data)
+	-- Like util.template, but deals with plain text
+	return { apply = function(values) return (data:gsub("{([^}]+)}", values)); end }
+end
+
+local function get_template(name, extension)
+	local fh = assert(module:load_resource("templates/"..name..extension));
+	local data = assert(fh:read("*a"));
+	fh:close();
+	return template(data);
+end
+
+local function render(template, data)
+	return tostring(template.apply(data));
+end
+
+function send_email(address, smtp_address, message_text, subject)
+	local rcpt = "<"..address..">";
+
+	local mesgt = {
+		headers = {
+			to = address;
+			subject = subject or ("Jabber password reset "..jid_bare(from_address));
+		};
+		body = message_text;
+	};
+	local ok, err = nil;
+
+	if not smtp_ssl then
+		ok, err = smtp.send{ from = smtp_address, rcpt = rcpt, source = smtp.message(mesgt),
+		        server = smtp_server, user = smtp_user, password = smtp_pass, port = 25 };
+	else
+		ok, err = smtp.send{ from = smtp_address, rcpt = rcpt, source = smtp.message(mesgt),
+                server = smtp_server, user = smtp_user, password = smtp_pass, port = smtp_port, create = enablessl };
+	end
+
+	if not ok then
+		module:log("error", "Failed to deliver to %s: %s", tostring(address), tostring(err));
+		return;
+	end
+	return true;
+end
+
+local vCard_mt = {
+	__index = function(t, k)
+		if type(k) ~= "string" then return nil end
+		for i=1,#t do
+			local t_i = rawget(t, i);
+			if t_i and t_i.name == k then
+				rawset(t, k, t_i);
+				return t_i;
+			end
+		end
+	end
+};
+
+local function get_user_vcard(user, host)
+        local vCard = dm_load(user, host or base_host, "vcard");
+        if vCard then
+                vCard = st.deserialize(vCard);
+                vCard = vcard.from_xep54(vCard);
+                return setmetatable(vCard, vCard_mt);
+        end
+end
+
+local changepass_tpl = get_template("changepass",".html");
+local sendmail_success_tpl = get_template("sendmailok",".html");
+local reset_success_tpl = get_template("resetok",".html");
+local token_tpl = get_template("token",".html");
+
+function generate_page(event, display_options)
+	local request = event.request;
+
+	return render(changepass_tpl, {
+		path = request.path; hostname = module.host;
+		notice = display_options and display_options.register_error or "";
+	})
+end
+
+function generate_token_page(event, display_options)
+        local request = event.request;
+
+        return render(token_tpl, {
+                path = request.path; hostname = module.host;
+				token = request.url.query;
+                notice = display_options and display_options.register_error or "";
+        })
+end
+
+function generateToken(address)
+	math.randomseed(os.time())
+	length = 16
+    if length < 1 then return nil end
+        local array = {}
+        for i = 1, length, 2 do
+            array[i] = string.char(math.random(48,57))
+			array[i+1] = string.char(math.random(97,122))
+        end
+	local token = table.concat(array);
+	if not tokens_mails[token] then
+
+		tokens_mails[token] = address;
+		tokens_expiration[token] = os.time();
+		return token
+	else
+		module:log("error", "Reset password token collision: '%s'", token);
+		return generateToken(address)
+	end
+end
+
+function isExpired(token) 
+	if not tokens_expiration[token] then
+		return nil;
+	end
+	if os.difftime(os.time(), tokens_expiration[token]) < 86400 then -- 86400 secs == 24h
+		-- token is valid yet
+		return nil;
+	else
+		-- token invalid, we can create a fresh one.
+		return true;
+	end 
+end
+
+-- Expire tokens 
+expireTokens = function()
+	for token,value in pairs(tokens_mails) do
+		if isExpired(token) then
+			module:log("info","Expiring password reset request from user '%s', not used.", tokens_mails[token]);
+			tokens_mails[token] = nil;
+			tokens_expiration[token] = nil;
+		end
+	end
+	return timer_repeat;
+end
+
+-- Check if a user has a active token not used yet.
+function hasTokenActive(address)
+	for token,value in pairs(tokens_mails) do
+		if address == value and not isExpired(token) then
+			return token;
+		end
+	end
+	return nil;
+end
+
+function generateUrl(token)
+	local url;
+	
+	if https_host then
+		url = "https://" .. https_host;
+	else
+		url = "http://" .. http_host;
+	end
+	
+	if https_port then
+		url = url .. ":" .. https_port[1];
+	else
+		url = url .. ":" .. http_port[1];
+	end
+	
+	url = url .. url_path .. "token.html?" .. token;
+	
+	return url;
+end
+
+function sendMessage(jid, subject, message)
+  local msg = st.message({ from = module.host; to = jid; }):
+	    tag("subject"):text(subject):up():
+	    tag("body"):text(message);
+  module:send(msg);
+end
+
+function send_token_mail(form, origin)
+	local user, host, resource = jidutil.split(form.username);
+	local prepped_username = nodeprep(user);
+	local prepped_mail = form.email;
+	local jid = prepped_username .. "@" .. host;
+	
+    if not prepped_username then
+    	return nil, "El usuario contiene caracteres incorrectos";
+    end
+    if #prepped_username == 0 then
+    	return nil, "El campo usuario está vacio";
+    end
+    if not usermanager.user_exists(prepped_username, module.host) then
+    	return nil, "El usuario NO existe";
+    end
+	
+	if #prepped_mail == 0 then
+    	return nil, "El campo email está vacio";
+    end
+
+	local vcarduser = get_user_vcard(prepped_username, module.host);
+	
+	if not vcarduser then
+		return nil, "User has not vCard";
+	else
+		if not vcarduser.EMAIL then
+			return nil, "Esa cuente no tiene ningún email configurado en su vCard";
+		end
+
+		email = string.lower(vcarduser.EMAIL[1]);
+
+		if email ~= string.lower(prepped_mail) then
+			return nil, "Dirección eMail incorrecta";
+		end
+		
+		-- Check if has already a valid token, not used yet.
+		if hasTokenActive(jid) then
+			local valid_until = tokens_expiration[hasTokenActive(jid)] + 86400;
+			return nil, "Ya tienes una petición de restablecimiento de clave válida hasta: " .. datetime.date(valid_until) .. " " .. datetime.time(valid_until);
+		end
+		
+		local url_token = generateToken(jid);
+		local url = generateUrl(url_token);
+		local email_body =  render(get_template("sendtoken",".mail"), {jid = jid, url = url} );
+		
+		module:log("info", "Sending password reset mail to user %s", jid);
+		send_email(email, smtp_address, email_body, mail_subject);
+		return "ok";
+	end
+
+end
+
+function reset_password_with_token(form, origin)
+	local token = form.token;
+	local password = form.newpassword;
+	
+	if not token then
+		return nil, "El Token es inválido";
+	end
+	if not tokens_mails[token] then
+		return nil, "El Token no existe o ya fué usado";
+	end
+	if not password then
+		return nil, "La campo clave no puede estar vacio";
+	end
+	if #password < 5 then
+		return nil, "La clave debe tener una longitud de al menos 5 caracteres";
+	end
+	local jid = tokens_mails[token];
+	local user, host, resource = jidutil.split(jid);
+	
+	usermanager.set_password(user, password, host);
+	module:log("info", "Password changed with token for user %s", jid);
+	tokens_mails[token] = nil;
+	tokens_expiration[token] = nil;
+	sendMessage(jid, mail_subject, mail_body);
+	return "ok";
+end
+
+function generate_success(event, form)
+	return render(sendmail_success_tpl, { jid = nodeprep(form.username).."@"..module.host });
+end
+
+function generate_register_response(event, form, ok, err)
+	local message;
+	if ok then
+		return generate_success(event, form);
+	else
+		return generate_page(event, { register_error = err });
+	end
+end
+
+function handle_form_token(event)
+	local request, response = event.request, event.response;
+	local form = http.formdecode(request.body);
+
+	local token_ok, token_err = send_token_mail(form, request);
+        response:send(generate_register_response(event, form, token_ok, token_err));
+
+	return true; -- Leave connection open until we respond above
+end
+
+function generate_reset_success(event, form)
+        return render(reset_success_tpl, { });
+end
+
+function generate_reset_response(event, form, ok, err)
+        local message;
+        if ok then
+                return generate_reset_success(event, form);
+        else
+                return generate_token_page(event, { register_error = err });
+        end
+end
+
+function handle_form_reset(event)
+	local request, response = event.request, event.response;
+        local form = http.formdecode(request.body);
+
+        local reset_ok, reset_err = reset_password_with_token(form, request);
+        response:send(generate_reset_response(event, form, reset_ok, reset_err));
+
+        return true; -- Leave connection open until we respond above
+
+end
+
+timer.add_task(timer_repeat, expireTokens);
+
+module:provides("http", {
+	default_path = url_path;
+	route = {
+	    ["GET /style.css"] = render(get_template("style",".css"), {});
+		["GET /token.html"] = generate_token_page;
+		["GET /"] = generate_page;
+		["POST /token.html"] = handle_form_reset;
+		["POST /"] = handle_form_token;
+	};
+});
+
+