Auto discover internal WebRTC candidate for add-on

docker/install_deps.sh

@@ -10,7 +10,9 @@ apt-get -qq install --no-install-recommends -y \
     wget \
     procps vainfo \
     unzip locales tzdata libxml2 xz-utils \
-    python3-pip
+    python3-pip \
+    curl \
+    jq
 
 mkdir -p -m 600 /root/.gnupg
 

docker/rootfs/etc/cont-init.d/prepare-go2rtc.sh

@@ -0,0 +1,47 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash
+# Prepare the go2rtc config
+
+set -o errexit -o nounset -o pipefail
+
+if [[ -z "${SUPERVISOR_TOKEN:-}" ]]; then
+    # Not running as a Home Assistant add-on, don't do anything
+    exit 0
+fi
+
+# Example: 192.168.1.10/24
+ip_regex='^([0-9]{1,3}\.{3}[0-9]{1,3})/[0-9]{1,2}$'
+if ip_address=$(
+    curl -fsSL \
+        -H "Authorization: Bearer ${SUPERVISOR_TOKEN}" \
+        -H "Content-Type: application/json" \
+        http://supervisor/network/interface/default/info |
+        jq --exit-status --raw-output '.data.ipv4.address[0]'
+) && [[ "${ip_address}" =~ ${ip_regex} ]]; then
+    ip_address="${BASH_REMATCH[1]}"
+    echo "Got IP address from supervisor: ${ip_address}"
+else
+    echo "Failed to get IP address from supervisor"
+    # Exit with success so that the container can still start
+    exit 0
+fi
+
+port_regex='^([0-9]{1,5})$'
+if webrtc_port=$(
+    curl -fsSL \
+        -H "Authorization: Bearer ${SUPERVISOR_TOKEN}" \
+        -H "Content-Type: application/json" \
+        http://supervisor/addons/self/info |
+        jq --exit-status --raw-output '.data.network["22/tcp"]'
+) && [[ "${webrtc_port}" =~ ${port_regex} ]]; then
+    webrtc_port="${BASH_REMATCH[1]}"
+    echo "Got WebRTC port from supervisor: ${ip_address}"
+else
+    echo "Failed to get WebRTC port from supervisor"
+    # Exit with success so that the container can still start
+    exit 0
+fi
+
+# Replace the IP address in the config
+candidate="${ip_address}:${webrtc_port}"
+sed --in-place "s/# - %%CANDIDATE%%/- ${candidate}/" /usr/local/go2rtc/go2rtc.yaml

docker/rootfs/usr/local/go2rtc/go2rtc.yaml

@@ -4,4 +4,5 @@ log:
 webrtc:
   listen: ":8555"
   candidates:
+    # - %%CANDIDATE%%
     - stun:8555