Initial commit: Nosterm client (terminal-style Nostr chat SPA)

docker-entrypoint.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+# regenerate runtime client config from env before caddy starts.
+#
+# the SPA fetches /config.json at startup, so this lets one prebuilt image be
+# deployed with different relays per environment without a rebuild. set
+# NOSTERM_DEFAULT_RELAYS to a comma-separated list of relay websocket urls.
+set -eu
+
+CONFIG_PATH=/srv/config.json
+RELAYS="${NOSTERM_DEFAULT_RELAYS:-}"
+
+# build a json array from the comma-separated list, trimming blanks.
+relays_json=""
+IFS=','
+for relay in $RELAYS; do
+	# trim surrounding whitespace.
+	trimmed="$(printf '%s' "$relay" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')"
+	[ -z "$trimmed" ] && continue
+	if [ -z "$relays_json" ]; then
+		relays_json="\"$trimmed\""
+	else
+		relays_json="$relays_json,\"$trimmed\""
+	fi
+done
+unset IFS
+
+printf '{\n  "relays": [%s]\n}\n' "$relays_json" > "$CONFIG_PATH"
+
+if [ -n "$relays_json" ]; then
+	echo "[entrypoint] wrote $CONFIG_PATH with relays: $RELAYS"
+else
+	echo "[entrypoint] no NOSTERM_DEFAULT_RELAYS set; wrote empty relay list"
+fi
+
+# hand off to the container command (caddy).
+exec "$@"