Implement missing sample data loading and one-time use security

- Fix UI to load server-hosted sample data at startup as per specification
- Add one-time use security: server clears sample data after retrieval
- Ensure React app periodically checks for new sample data availability
- Remove complex same-origin protection in favor of simpler one-time use model
- Improve data security by preventing data persistence after consumption

Dockerfile

@@ -31,8 +31,14 @@ RUN if [ -n "$VERSION" ]; then \
       echo "📝 Generated version.js with VERSION=$VERSION, IS_RELEASE=$IS_RELEASE"; \
     fi
 
-# Build the application
-RUN npm run build
+# Build the application (skip prebuild if we already generated version.js)
+RUN if [ -n "$VERSION" ]; then \
+      echo "🚀 Building with pre-generated version.js" && \
+      npx react-scripts build; \
+    else \
+      echo "🚀 Building with version-check.js" && \
+      npm run build; \
+    fi
 
 # Production stage
 FROM node:24-alpine AS production

bin/upload-jmespath

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+API_URL="https://jmespath-playground.koszewscy.waw.pl"
+JSON_FILE="-"
+
+function usage() {
+    echo "Usage: $0 [--api-url <url>] [--json-file <file>]"
+    exit 1
+}
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --api-url)
+            API_URL="$2"
+            shift 2
+            ;;
+        --json-file)
+            JSON_FILE="$2"
+            shift 2
+            ;;
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        *)
+            echo "ERROR: Unknown argument: $1"
+            usage
+            exit 1
+            ;;
+    esac
+done
+
+# Send the POST request
+curl -s -X POST \
+    -H "Content-Type: application/json" \
+    -H "Accept: application/json" \
+    --data @${JSON_FILE} \
+    "$API_URL/api/v1/upload"
+

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jmespath-playground",
-  "version": "1.1.3",
+  "version": "1.1.7",
   "description": "A React-based web application for testing JMESPath expressions against JSON data",
   "main": "index.js",
   "scripts": {

scripts/build-image.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# JMESPath Testing Tool - Docker Image Build Script
+
+set -e
+
+echo "🐳 JMESPath Testing Tool - Docker Image Build"
+echo "=============================================="
+echo ""
+
+# Check if Docker is available
+if ! command -v docker &> /dev/null; then
+    echo "❌ Docker not found. Please install Docker to build container images."
+    exit 1
+fi
+
+# Determine version information for Docker build
+VERSION=$(git tag --points-at HEAD 2>/dev/null | sed 's/^v//' | head -n 1)
+
+if [ -n "$VERSION" ]; then
+    # We're at a tagged commit - release build
+    echo "📦 Building release version: $VERSION"
+    docker build \
+        --build-arg VERSION="$VERSION" \
+        --build-arg IS_RELEASE="true" \
+        -t skoszewski/jmespath-playground:$VERSION \
+        -t skoszewski/jmespath-playground:latest .
+    echo "✅ Built Docker images: skoszewski/jmespath-playground:$VERSION, skoszewski/jmespath-playground:latest"
+
+    echo ""
+    echo "To run the release container:"
+    echo "  docker run -p 3000:3000 skoszewski/jmespath-playground:$VERSION"
+    echo "  docker run -p 3000:3000 skoszewski/jmespath-playground:latest"
+
+    echo ""
+    echo "To push to Docker Hub:"
+    echo "  docker push skoszewski/jmespath-playground:$VERSION"
+    echo "  docker push skoszewski/jmespath-playground:latest"
+else
+    # Development build
+    PACKAGE_VERSION=$(grep '"version"' package.json | cut -d'"' -f4)
+    DEV_VERSION="${PACKAGE_VERSION}-dev"
+    echo "📦 Building development version: $DEV_VERSION"
+    docker build \
+        --build-arg VERSION="$DEV_VERSION" \
+        --build-arg IS_RELEASE="false" \
+        -t skoszewski/jmespath-playground:dev \
+        -t skoszewski/jmespath-playground:latest .
+    echo "✅ Built Docker images: skoszewski/jmespath-playground:dev, skoszewski/jmespath-playground:latest"
+
+    echo ""
+    echo "To run the development container:"
+    echo "  docker run -p 3000:3000 skoszewski/jmespath-playground:dev"
+    echo "  docker run -p 3000:3000 skoszewski/jmespath-playground:latest"
+
+    echo ""
+    echo "To push to Docker Hub:"
+    echo "  docker push skoszewski/jmespath-playground:dev"
+    echo "  docker push skoszewski/jmespath-playground:latest"
+fi
+
+echo ""
+echo "🎉 Docker image build completed successfully!"

scripts/build.sh

@@ -30,49 +30,10 @@ npm install
 echo "🔨 Building production bundle..."
 npm run build
 
-# Optional container build with Docker
-if command -v docker &> /dev/null; then
-    echo "🐳 Building Docker container (optional)..."
-
-    # Determine version information for Docker build
-    VERSION=$(git tag --points-at HEAD 2>/dev/null | sed 's/^v//' | head -n 1)
-
-    if [ -n "$VERSION" ]; then
-        # We're at a tagged commit - release build
-        echo "📦 Building release version: $VERSION"
-        docker build \
-            --build-arg VERSION="$VERSION" \
-            --build-arg IS_RELEASE="true" \
-            -t jmespath-playground:$VERSION \
-            -t jmespath-playground:latest .
-        echo "✅ Built Docker images: jmespath-playground:$VERSION, jmespath-playground:latest"
-    else
-        # Development build
-        PACKAGE_VERSION=$(grep '"version"' package.json | cut -d'"' -f4)
-        DEV_VERSION="${PACKAGE_VERSION}-dev"
-        echo "📦 Building development version: $DEV_VERSION"
-        docker build \
-            --build-arg VERSION="$DEV_VERSION" \
-            --build-arg IS_RELEASE="false" \
-            -t jmespath-playground:dev \
-            -t jmespath-playground:latest .
-        echo "✅ Built Docker images: jmespath-playground:dev, jmespath-playground:latest"
-    fi
-else
-    echo "💡 Docker not found. Container build is optional."
-    echo "   Install Docker if you want to build containers."
-fi
-
 echo "✅ Build completed successfully!"
 echo ""
 echo "To run the application:"
 echo "  npm run server         # Run integrated server locally"
-if command -v docker &> /dev/null; then
-    VERSION=$(git tag --points-at HEAD 2>/dev/null | sed 's/^v//' | head -n 1)
-    if [ -n "$VERSION" ]; then
-        echo "  docker run -p 3000:3000 jmespath-playground:$VERSION  # Run release container"
-    else
-        echo "  docker run -p 3000:3000 jmespath-playground:dev      # Run dev container"
-    fi
-    echo "  docker run -p 3000:3000 jmespath-playground:latest      # Run latest container"
-fi
+echo ""
+echo "To build Docker image:"
+echo "  scripts/build-image.sh # Build Docker container image"

server.js

@@ -51,7 +51,13 @@ function createApp() {
 
   app.get('/api/v1/sample', (req, res) => {
     try {
-      res.json(sampleData);
+      const dataToReturn = sampleData;
+
+      // Security: Clear the sample data after it's retrieved (one-time use)
+      sampleData = null;
+      console.log('📤 Sample data retrieved and cleared from server memory');
+
+      res.json(dataToReturn);
     } catch (error) {
       res.status(500).json({ error: 'Failed to retrieve sample data' });
     }

src/App.js

@@ -54,22 +54,30 @@ function App() {
     localStorage.setItem('theme', theme);
   }, [theme]);
 
-  // API polling for state changes
+  // API polling for state changes and initial sample data load
   useEffect(() => {
-    // Initial state load
-    const loadInitialState = async () => {
+    // Initial load: get both state and sample data
+    const loadInitialData = async () => {
       try {
-        const response = await fetch('/api/v1/state');
-        if (response.ok) {
-          const data = await response.json();
-          setCurrentStateGuid(data.state);
+        // Load sample data first
+        const sampleResponse = await fetch('/api/v1/sample');
+        if (sampleResponse.ok) {
+          const sampleData = await sampleResponse.json();
+          setJsonData(JSON.stringify(sampleData, null, 2));
+        }
+
+        // Then load state GUID
+        const stateResponse = await fetch('/api/v1/state');
+        if (stateResponse.ok) {
+          const stateData = await stateResponse.json();
+          setCurrentStateGuid(stateData.state);
         }
       } catch (error) {
         console.debug('API not available:', error);
       }
     };
 
-    loadInitialState();
+    loadInitialData();
 
     // Poll for state changes every 3 seconds
     const interval = setInterval(async () => {