Add proxy integration test

.github/workflows/test-proxy.yml

@@ -0,0 +1,114 @@
+name: Test Proxy
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+permissions:
+  contents: read
+
+jobs:
+  # End to end upload with proxy
+  test-proxy-upload:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:latest
+      options: --cap-add=NET_ADMIN
+    services:
+      squid-proxy:
+        image: ubuntu/squid:latest
+        ports:
+          - 3128:3128
+    env:
+      http_proxy: http://squid-proxy:3128
+      https_proxy: http://squid-proxy:3128
+    steps:
+    - name: Wait for proxy to be ready
+      shell: bash
+      run: |
+        echo "Waiting for squid proxy to be ready..."
+        echo "Resolving squid-proxy hostname:"
+        getent hosts squid-proxy || echo "DNS resolution failed"
+        for i in $(seq 1 30); do
+          if (echo > /dev/tcp/squid-proxy/3128) 2>/dev/null; then
+            echo "Proxy is ready!"
+            exit 0
+          fi
+          echo "Attempt $i: Proxy not ready, waiting..."
+          sleep 2
+        done
+        echo "Proxy failed to become ready"
+        exit 1
+      env:
+        http_proxy: ""
+        https_proxy: ""
+    - name: Install dependencies
+      run: |
+        apt-get update
+        apt-get install -y iptables curl
+    - name: Verify proxy is working
+      run: |
+        echo "Testing proxy connectivity..."
+        curl -s -o /dev/null -w "%{http_code}" --proxy http://squid-proxy:3128 http://github.com || true
+        echo "Proxy verification complete"
+    - name: Block direct traffic (enforce proxy usage)
+      run: |
+        # Get the squid-proxy container IP
+        PROXY_IP=$(getent hosts squid-proxy | awk '{ print $1 }')
+        echo "Proxy IP: $PROXY_IP"
+
+        # Allow loopback traffic
+        iptables -A OUTPUT -o lo -j ACCEPT
+
+        # Allow traffic to the proxy container
+        iptables -A OUTPUT -d $PROXY_IP -j ACCEPT
+
+        # Allow established connections
+        iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+
+        # Allow DNS (needed for initial resolution)
+        iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
+        iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
+
+        # Block all other outbound traffic (HTTP/HTTPS)
+        iptables -A OUTPUT -p tcp --dport 80 -j REJECT
+        iptables -A OUTPUT -p tcp --dport 443 -j REJECT
+
+        # Log the iptables rules for debugging
+        iptables -L -v -n
+    - name: Verify direct HTTPS is blocked
+      run: |
+        echo "Testing that direct HTTPS requests fail..."
+        if curl --noproxy '*' -s --connect-timeout 5 https://github.com > /dev/null 2>&1; then
+          echo "ERROR: Direct HTTPS request succeeded - blocking is not working!"
+          exit 1
+        else
+          echo "SUCCESS: Direct HTTPS request was blocked as expected"
+        fi
+
+        echo "Testing that HTTPS through proxy succeeds..."
+        if curl --proxy http://squid-proxy:3128 -s --connect-timeout 10 https://github.com > /dev/null 2>&1; then
+          echo "SUCCESS: HTTPS request through proxy succeeded"
+        else
+          echo "ERROR: HTTPS request through proxy failed!"
+          exit 1
+        fi
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Create artifact file
+      run: |
+        mkdir -p test-artifacts
+        echo "Proxy test artifact - $GITHUB_RUN_ID" > test-artifacts/proxy-test.txt
+        echo "Random data: $RANDOM $RANDOM $RANDOM" >> test-artifacts/proxy-test.txt
+        cat test-artifacts/proxy-test.txt
+    - name: Upload artifact through proxy
+      uses: ./
+      with:
+        name: 'Proxy-Test-Artifact-${{ github.run_id }}'
+        path: test-artifacts/proxy-test.txt