Load Flutter runtime config from Vault

.gitea/workflows/build-and-deploy.yml

@@ -16,33 +16,17 @@ jobs:
       SERVICE_NAME: flutter
       IMAGE_SHA: gitea.dsrptlab.com/mapflow/flutter:${{ github.sha }}
       IMAGE_LATEST: gitea.dsrptlab.com/mapflow/flutter:latest
-      VAULT_HOST: mars
-      VAULT_SERVICE: mapflow-vault-zy5kwf
-      VAULT_PROJECT_PATH: secret/projects/mapflow/prod
     steps:
       - uses: actions/checkout@v4
 
       - name: Build and push image
         run: |
           set -euo pipefail
-          mapbox_token_file="$(mktemp)"
-          trap 'rm -f "$mapbox_token_file"' EXIT
-          ssh -o StrictHostKeyChecking=accept-new -o BatchMode=yes "root@$VAULT_HOST" \
-            "set -euo pipefail
-            vault_service='$VAULT_SERVICE'
-            vault_project_path='$VAULT_PROJECT_PATH'
-            c=\$(docker ps --format '{{.Names}}' | grep \"^\$vault_service\" | head -1)
-            token=\$(docker service inspect \"\$vault_service\" --format '{{json .Spec.TaskTemplate.ContainerSpec.Env}}' | jq -r '.[] | select(startswith(\"VAULT_ROOT_TOKEN=\")) | sub(\"^VAULT_ROOT_TOKEN=\"; \"\")')
-            docker exec -e VAULT_ADDR=http://127.0.0.1:8200 -e VAULT_TOKEN=\"\$token\" \"\$c\" vault kv get -field=MAPBOX_ACCESS_TOKEN \"\$vault_project_path\"" \
-            > "$mapbox_token_file"
-          [ -s "$mapbox_token_file" ]
           for attempt in 1 2 3; do
             if docker build \
               --provenance=false \
               --tag "$IMAGE_SHA" \
               --tag "$IMAGE_LATEST" \
-              --secret id=mapbox_access_token,src="$mapbox_token_file" \
-              --build-arg MAPBOX_STYLE="mapbox/standard" \
               --build-arg TELEGRAM_BOT_USERNAME="carfteebot" \
               --build-arg BUILD_VERSION="${GITHUB_SHA}" \
               . &&

Dockerfile

@@ -1,18 +1,12 @@
-# syntax=docker/dockerfile:1.7
 FROM ghcr.io/cirruslabs/flutter:stable AS build
 WORKDIR /app
-ARG MAPBOX_STYLE="mapbox/standard"
 ARG TELEGRAM_BOT_USERNAME="carfteebot"
 ARG BUILD_VERSION="local"
 COPY pubspec.* ./
 RUN flutter pub get
 COPY . .
-RUN --mount=type=secret,id=mapbox_access_token,required=true \
-  MAPBOX_ACCESS_TOKEN="$(cat /run/secrets/mapbox_access_token)" && \
-  rm -rf build/web && \
+RUN rm -rf build/web && \
   flutter build web --release --base-href=/ -o build/web \
-  --dart-define=MAPBOX_ACCESS_TOKEN="$MAPBOX_ACCESS_TOKEN" \
-  --dart-define=MAPBOX_STYLE="$MAPBOX_STYLE" \
   --dart-define=TELEGRAM_BOT_USERNAME="$TELEGRAM_BOT_USERNAME" && \
   cp web/index.prod.html build/web/index.html && \
   rm -f build/web/index.prod.html && \
@@ -22,6 +16,9 @@ RUN --mount=type=secret,id=mapbox_access_token,required=true \
     --version="$BUILD_VERSION"
 
 FROM nginx:1.27-alpine
+RUN apk add --no-cache curl jq
 COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY scripts/40-mapflow-runtime-config.sh /docker-entrypoint.d/40-mapflow-runtime-config.sh
 COPY --from=build /app/build/web /usr/share/nginx/html
+RUN chmod +x /docker-entrypoint.d/40-mapflow-runtime-config.sh
 EXPOSE 80

lib/features/mapflow/presentation/mapflow_shell.dart

@@ -15,16 +15,17 @@ import '../../../app/router/app_router.dart';
 import '../../../app/theme/mapflow_theme.dart';
 import '../../../shared/auth/telegram_login_button.dart';
 import '../../../shared/auth/telegram_session.dart' as telegram_session;
+import '../../../shared/runtime_config/runtime_config.dart' as runtime_config;
 import '../application/place_cubit.dart';
 import '../data/auth_repository.dart';
 import '../data/places_repository.dart';
 import '../domain/place_models.dart';
 import 'widgets/place_photo_card.dart';
 
-const _mapboxStyle = String.fromEnvironment(
-  'MAPBOX_STYLE',
-  defaultValue: 'mapbox/standard',
-);
+String get _mapboxStyle {
+  final style = runtime_config.mapboxStyle();
+  return style.isEmpty ? 'mapbox/standard' : style;
+}
 
 class MapflowShell extends StatelessWidget {
   const MapflowShell({super.key});

lib/main.dart

@@ -4,13 +4,13 @@ import 'package:mapbox_maps_flutter/mapbox_maps_flutter.dart' as mbx;
 
 import 'app/app.dart';
 import 'shared/auth/telegram_session.dart' as telegram_session;
-
-const _mapboxAccessToken = String.fromEnvironment('MAPBOX_ACCESS_TOKEN');
+import 'shared/runtime_config/runtime_config.dart' as runtime_config;
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
-  if (_mapboxAccessToken.isNotEmpty) {
-    mbx.MapboxOptions.setAccessToken(_mapboxAccessToken);
+  final mapboxAccessToken = runtime_config.mapboxAccessToken();
+  if (mapboxAccessToken.isNotEmpty) {
+    mbx.MapboxOptions.setAccessToken(mapboxAccessToken);
   }
   usePathUrlStrategy();
   telegram_session.configureTelegramWebApp();

lib/shared/runtime_config/runtime_config.dart

@@ -0,0 +1,2 @@
+export 'runtime_config_stub.dart'
+    if (dart.library.js_interop) 'runtime_config_web.dart';

lib/shared/runtime_config/runtime_config_stub.dart

@@ -0,0 +1,3 @@
+String mapboxAccessToken() => '';
+
+String mapboxStyle() => '';

lib/shared/runtime_config/runtime_config_web.dart

@@ -0,0 +1,13 @@
+import 'dart:js_interop';
+
+@JS('__MAPFLOW_CONFIG__')
+external _MapflowConfig? get _config;
+
+extension type _MapflowConfig(JSObject _) implements JSObject {
+  external JSString? get mapboxAccessToken;
+  external JSString? get mapboxStyle;
+}
+
+String mapboxAccessToken() => _config?.mapboxAccessToken?.toDart ?? '';
+
+String mapboxStyle() => _config?.mapboxStyle?.toDart ?? '';

nginx.conf

@@ -28,7 +28,7 @@ server {
     try_files /index.html =404;
   }
 
-  location ~* ^/(bootstrap\.js|sw\.js)$ {
+  location ~* ^/(bootstrap\.js|sw\.js|config\.js)$ {
     add_header Cache-Control "no-cache" always;
     add_header Pragma "no-cache" always;
     add_header Expires "0" always;

scripts/40-mapflow-runtime-config.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+set -eu
+
+config_path="/usr/share/nginx/html/config.js"
+
+require_env() {
+  name="$1"
+  eval "value=\${$name:-}"
+  if [ -z "$value" ]; then
+    echo "$name is required when VAULT_ENABLED=true." >&2
+    exit 1
+  fi
+}
+
+read_vault_path() {
+  path="$1"
+  curl -fsS \
+    -H "X-Vault-Token: $VAULT_TOKEN" \
+    "$VAULT_ADDR/v1/$VAULT_KV_MOUNT/data/$path" |
+    jq -e '.data.data'
+}
+
+json_string() {
+  jq -Rn --arg value "$1" '$value'
+}
+
+if [ "${VAULT_ENABLED:-}" = "true" ]; then
+  require_env VAULT_ADDR
+  require_env VAULT_TOKEN
+  require_env VAULT_KV_MOUNT
+  require_env VAULT_SHARED_PATH
+  require_env VAULT_PROJECT_PATH
+
+  shared_env="$(read_vault_path "$VAULT_SHARED_PATH")"
+  project_env="$(read_vault_path "$VAULT_PROJECT_PATH")"
+  runtime_env="$(jq -n --argjson shared "$shared_env" --argjson project "$project_env" '$shared * $project')"
+
+  MAPBOX_ACCESS_TOKEN="$(printf '%s' "$runtime_env" | jq -er '.MAPBOX_ACCESS_TOKEN')"
+  MAPBOX_STYLE="$(printf '%s' "$runtime_env" | jq -r '.MAPBOX_STYLE // "mapbox/standard"')"
+else
+  MAPBOX_ACCESS_TOKEN="${MAPBOX_ACCESS_TOKEN:-}"
+  MAPBOX_STYLE="${MAPBOX_STYLE:-mapbox/standard}"
+fi
+
+cat >"$config_path" <<EOF
+window.__MAPFLOW_CONFIG__ = {
+  mapboxAccessToken: $(json_string "$MAPBOX_ACCESS_TOKEN"),
+  mapboxStyle: $(json_string "$MAPBOX_STYLE")
+};
+EOF

web/index.prod.html

@@ -87,6 +87,7 @@
       });
     }
   </script>
+  <script src="config.js"></script>
   <script
     defer
     data-sw-bootstrap