[charts:sftd] Introduce flag to enable TURN discovery (#1519)

* [charts:sftd] Introduce flag to enable TURN discovery

* -f integrate review feedback

* changelog

Co-authored-by: jschaul <[email protected]>

Author: lucendio

changelog.d/2-features/pr-1519

@@ -0,0 +1 @@
+SFT: allow using TURN discovery using 'turnDiscoveryEnabled'

charts/sftd/templates/statefulset.yaml

@@ -83,7 +83,12 @@ spec:
               else
                 ACCESS_ARGS="-A ${EXTERNAL_IP}"
               fi
-              exec sftd  -I "${POD_IP}" -M "${POD_IP}" ${ACCESS_ARGS} -u "https://{{ required "must specify host" .Values.host }}/sfts/${POD_NAME}"
+              exec sftd \
+                      -I "${POD_IP}" \
+                      -M "${POD_IP}" \
+                      ${ACCESS_ARGS} \
+                      {{ if .Values.turnDiscoveryEnabled }}-T{{ end }} \
+                      -u "https://{{ required "must specify host" .Values.host }}/sfts/${POD_NAME}"
           ports:
             - name: sft
               containerPort: 8585

charts/sftd/values.yaml

@@ -81,3 +81,7 @@ joinCall:
     # Overrides the image tag whose default is the chart appVersion.
     tag: "1.19.5"
 
+# Allow SFT instances to choose/consider using a TURN server for themselves as a proxy when
+# trying to establish a connection to clients
+# DOCS: https://docs.wire.com/understand/sft.html#prerequisites
+turnDiscoveryEnabled: false