Generate Frontend config and serve it (#657)

See #656.

Author: matthew-white

files/nginx/client-config.json.template

@@ -0,0 +1,3 @@
+{
+  "oidcEnabled": $OIDC_ENABLED
+}

files/nginx/odk.conf.template

@@ -67,6 +67,10 @@ server {
       include /usr/share/odk/nginx/common-headers.conf;
       add_header Cache-Control no-cache;
     }
+    location /client-config.json {
+      include /usr/share/odk/nginx/common-headers.conf;
+      add_header Cache-Control no-cache;
+    }
     location /index.html {
       include /usr/share/odk/nginx/common-headers.conf;
       add_header Cache-Control no-cache;

files/prebuild/build-frontend.sh

@@ -1,4 +1,4 @@
 #!/bin/bash -eu
 cd client
 npm clean-install --no-audit --fund=false --update-notifier=false
-VUE_APP_OIDC_ENABLED="$OIDC_ENABLED" npm run build
+npm run build

files/prebuild/write-client-config.sh

@@ -0,0 +1,9 @@
+#!/bin/bash -eu
+set -o pipefail
+
+if [[ $OIDC_ENABLED != 'true' ]] && [[ $OIDC_ENABLED != 'false' ]]; then
+  echo 'OIDC_ENABLED must be either true or false'
+  exit 1
+fi
+
+envsubst < files/nginx/client-config.json.template > /tmp/client-config.json

nginx.dockerfile

@@ -3,12 +3,14 @@ FROM node:20.12.2-slim as intermediate
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         git \
+        gettext-base \
     && rm -rf /var/lib/apt/lists/*
 
 COPY ./ ./
 RUN files/prebuild/write-version.sh
+RUN files/prebuild/build-frontend.sh
 ARG OIDC_ENABLED
-RUN OIDC_ENABLED="$OIDC_ENABLED" files/prebuild/build-frontend.sh
+RUN files/prebuild/write-client-config.sh
 
 
 
@@ -32,3 +34,4 @@ COPY files/nginx/*.conf* /usr/share/odk/nginx/
 
 COPY --from=intermediate client/dist/ /usr/share/nginx/html
 COPY --from=intermediate /tmp/version.txt /usr/share/nginx/html
+COPY --from=intermediate /tmp/client-config.json /usr/share/nginx/html