local st = require "util.stanza";
local sha256_hash = require "util.hashes".sha256;
local nameprep = require "util.encodings".stringprep.nameprep;
local st = require "util.stanza";
local sha256_hash = require "util.hashes".sha256;
local nameprep = require "util.encodings".stringprep.nameprep;
local xmlns_stream = "http://etherx.jabber.org/streams";
local dialback_requests = setmetatable({}, { __mode = 'v' });
local xmlns_stream = "http://etherx.jabber.org/streams";
local dialback_requests = setmetatable({}, { __mode = 'v' });