local base64 = require "util.encodings".base64;
local sha1 = require "util.hashes".sha1;
local st = require "util.stanza";
local sm_bind_resource = require "core.sessionmanager".bind_resource;
local xmlns_bind2 = "urn:xmpp:bind2:1";
local xmlns_sasl2 = "urn:xmpp:sasl:1";
-- Advertise what we can do
module:hook("stream-features", function(event)
local origin, features = event.origin, event.features;
if origin.type ~= "c2s_unauthed" then
return;
end
local inline = st.stanza("inline", { xmlns = xmlns_bind2 });
module:fire_event("advertise-bind-features", { origin = origin, features = inline });
features:add_direct_child(inline);
end, 1);
module:hook("advertise-sasl-features", function(event)
event.features:tag("bind", { xmlns = xmlns_bind2 }):up();
end, 1);
-- Helper to actually bind a resource to a session
local function do_bind(session, bind_request)
local resource;
local client_id_tag = bind_request:get_child("client-id");
local client_id = client_id_tag and client_id_tag:text() or session.client_id;
if client_id and client_id ~= "" then
local tag = client_id_tag and client_id_tag.attr.tag or "client";
resource = ("%s~%s"):format(tag, base64.encode(sha1(client_id):sub(1, 9)));
end
local success, err_type, err, err_msg = sm_bind_resource(session, resource);
if not success then
session.log("debug", "Resource bind failed: %s", err_msg or err);
return nil, { type = err_type, condition = err, text = err_msg };
end
session.log("debug", "Resource bound: %s", session.full_jid);
return st.stanza("bound", { xmlns = xmlns_bind2 })
:text_tag("jid", session.full_jid)
end
-- Enable inline features requested by the client
local function enable_features(session, bind_request, bind_result)
local features = bind_request:get_child("features");
if not features then return; end
module:fire_event("process-bind-features", {
session = session;
features = features;
result = bind_result;
});
end
-- SASL 2 integration
module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
-- Cache action for future processing (after auth success)
session.sasl2_bind_request = auth:child_with_ns(xmlns_bind2);
end, 100);
module:hook("sasl2/c2s/success", function (event)
local session = event.session;
local bind_request = session.sasl2_bind_request;
if not bind_request then return; end -- No bind requested
session.sasl2_bind_request = nil;
local sm_success = event.sasl2_sm_success;
if sm_success and sm_success.type == "resumed" then
return; -- No need to bind a resource
end
local bind_result, err = do_bind(session, bind_request);
if not bind_result then
bind_result = st.stanza("failed", { xmlns = xmlns_bind2 })
:add_error(err);
else
enable_features(session, bind_request, bind_result);
end
event.success:add_child(bind_result);
end, 100);
-- Inline features
module:hook("advertise-bind-features", function (event)
local features = event.features;
features:tag("feature", { var = "urn:xmpp:carbons:2" }):up();
features:tag("feature", { var = "urn:xmpp:csi:0" }):up();
end);
module:hook("enable-bind-features", function (event)
local session, features = event.session, event.features;
-- Carbons
session.want_carbons = not not features:get_child("enable", "urn:xmpp:carbons:2");
-- CSI
local csi_state_tag = features:child_with_ns("urn:xmpp:csi:0");
if csi_state_tag then
session.state = csi_state_tag.name;
end
end, 10);