require "base64" sasl = {} function sasl:new_plain(onAuth, onSuccess, onFail, onWrite) local object = { mechanism = "PLAIN", onAuth = onAuth, onSuccess = onSuccess, onFail = onFail, onWrite = onWrite} local challenge = base64.encode(""); onWrite(stanza.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge)) object.feed = function(self, stanza) if (stanza.name ~= "response") then self.onFail() end if (stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl") then self.onFail() end local response = base64.decode(stanza.tag[1]) local authorization = string.match(response, "([^&\0]+)") local authentication = string.match(response, "\0([^&\0]+)\0") local password = string.match(response, "\0[^&\0]+\0([^&\0]+)") if self.onAuth(authorization, password) == true then self.onWrite(stanza.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"})) self.onSuccess() else self.onWrite(stanza.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure")); end end return object end function sasl:new(mechanism, onAuth, onSuccess, onFail, onWrite) local object if mechanism == "PLAIN" then object = new_plain(onAuth, onSuccess, onFail, onWrite) else onFail() end return object end module "sasl"