From 704c42c404be599c65cb954a7c1d8295091e8e00 Mon Sep 17 00:00:00 2001
From: Thomas E Lackey <telackey@bozemanpass.com>
Date: Fri, 23 Feb 2024 20:32:24 +0000
Subject: [PATCH] Use a catchall for single page apps. (#763)

This creates a new environment variable, CERC_SINGLE_PAGE_APP, which controls whether a catchall redirection back to / is applied.

If the value is not explicitly set, we try to detect if the page looks like a single-page app.

Reviewed-on: https://git.vdb.to/cerc-io/stack-orchestrator/pulls/763
Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Co-committed-by: Thomas E Lackey <telackey@bozemanpass.com>
---
 .../scripts/start-serving-app.sh              | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/stack_orchestrator/data/container-build/cerc-webapp-base/scripts/start-serving-app.sh b/stack_orchestrator/data/container-build/cerc-webapp-base/scripts/start-serving-app.sh
index f9aa2c33..4fa1dc03 100755
--- a/stack_orchestrator/data/container-build/cerc-webapp-base/scripts/start-serving-app.sh
+++ b/stack_orchestrator/data/container-build/cerc-webapp-base/scripts/start-serving-app.sh
@@ -3,13 +3,28 @@ if [ -n "$CERC_SCRIPT_DEBUG" ]; then
     set -x
 fi
 
+CERC_LISTEN_PORT=${CERC_LISTEN_PORT:-80}
 CERC_WEBAPP_FILES_DIR="${CERC_WEBAPP_FILES_DIR:-/data}"
 CERC_ENABLE_CORS="${CERC_ENABLE_CORS:-false}"
+CERC_SINGLE_PAGE_APP="${CERC_SINGLE_PAGE_APP}"
+
+if [ -z "${CERC_SINGLE_PAGE_APP}" ]; then
+  if [ 1 -eq $(find "${CERC_WEBAPP_FILES_DIR}" -name '*.html' | wc -l) ] && [ -d "${CERC_WEBAPP_FILES_DIR}/static" ]; then
+    CERC_SINGLE_PAGE_APP=true
+  else
+    CERC_SINGLE_PAGE_APP=false
+  fi
+fi
 
 if [ "true" == "$CERC_ENABLE_CORS" ]; then
   CERC_HTTP_EXTRA_ARGS="$CERC_HTTP_EXTRA_ARGS --cors"
 fi
 
+if [ "true" == "$CERC_SINGLE_PAGE_APP" ]; then
+  # Create a catchall redirect back to /
+  CERC_HTTP_EXTRA_ARGS="$CERC_HTTP_EXTRA_ARGS --proxy http://localhost:${CERC_LISTEN_PORT}?"
+fi
+
 LACONIC_HOSTED_CONFIG_FILE=${LACONIC_HOSTED_CONFIG_FILE}
 if [ -z "${LACONIC_HOSTED_CONFIG_FILE}" ]; then
   if [ -f "/config/laconic-hosted-config.yml" ]; then
@@ -20,8 +35,8 @@ if [ -z "${LACONIC_HOSTED_CONFIG_FILE}" ]; then
 fi
 
 if [ -f "${LACONIC_HOSTED_CONFIG_FILE}" ]; then
-  /scripts/apply-webapp-config.sh $LACONIC_HOSTED_CONFIG_FILE ${CERC_WEBAPP_FILES_DIR}
+  /scripts/apply-webapp-config.sh $LACONIC_HOSTED_CONFIG_FILE "${CERC_WEBAPP_FILES_DIR}"
 fi
 
 /scripts/apply-runtime-env.sh ${CERC_WEBAPP_FILES_DIR}
-http-server $CERC_HTTP_EXTRA_ARGS -p ${CERC_LISTEN_PORT:-80} ${CERC_WEBAPP_FILES_DIR}
+http-server $CERC_HTTP_EXTRA_ARGS -p ${CERC_LISTEN_PORT} "${CERC_WEBAPP_FILES_DIR}"
\ No newline at end of file