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-- Manage snap audio permissions
--
-- Copyright © 2023 Canonical Ltd.
-- @author Sergio Costas Rodriguez <sergio.costas@canonical.com>
--
-- SPDX-License-Identifier: MIT
function removeClientPermissionsForOtherClients (client)
-- Remove access to any other clients, but allow all the process of the
-- same snap to access their elements
local client_id = client.properties["pipewire.snap.id"]
for snap_client in clients_snap:iterate() do
local snap_client_id = snap_client.properties["pipewire.snap.id"]
if snap_client_id ~= client_id then
client:update_permissions { [snap_client["bound-id"]] = "-" }
end
end
for no_snap_client in clients_no_snap:iterate() do
client:update_permissions { [no_snap_client["bound-id"]] = "-" }
end
end
function updateClientPermissions (client)
-- Remove access to Audio/Sources and Audio/Sinks based on snap permissions
for node in nodes_om:iterate() do
local node_id = node["bound-id"]
local property = "pipewire.snap.audio.playback"
if node.properties["media.class"] == "Audio/Source" then
property = "pipewire.snap.audio.record"
end
if client.properties[property] ~= "true" then
client:update_permissions { [node_id] = "-" }
end
end
end
clients_snap = ObjectManager {
Interest {
type = "client",
Constraint { "pipewire.snap.id", "+", type = "pw"},
}
}
clients_no_snap = ObjectManager {
Interest {
type = "client",
Constraint { "pipewire.snap.id", "-", type = "pw"},
}
}
nodes_om = ObjectManager {
Interest {
type = "node",
Constraint { "media.class", "matches", "Audio/*"}
}
}
clients_snap:connect("object-added", function (om, client)
-- If a new snap client is added, adjust its permissions
updateClientPermissions (client)
removeClientPermissionsForOtherClients (client)
end)
clients_no_snap:connect("object-added", function (om, client)
-- If a new, non-snap client is added,
-- remove access to it from other snaps
client_id = client["bound-id"]
for snap_client in clients_snap:iterate() do
if client.properties["pipewire.snap.id"] ~= nil then
snap_client:update_permissions { [client_id] = "-" }
end
end
end)
nodes_om:connect("object-added", function (om, node)
-- If a new Audio/Sink or Audio/Source node is added,
-- adjust the permissions in the snap clients
for client in clients_snap:iterate() do
updateClientPermissions (client)
end
end)
clients_snap:activate()
clients_no_snap:activate()
nodes_om:activate()