nginx.conf

# ╔══════════════════════════════════════════════════════════════╗
# ║         🔐  Keyper  –  nginx SPA Server Config              ║
# ╚══════════════════════════════════════════════════════════════╝
#
# Placed at /etc/nginx/conf.d/default.conf inside the container.
# Handles:
#  • React SPA single-page routing (try_files fallback)
#  • WebAssembly MIME type (required for argon2-browser)
#  • Long-lived cache headers for immutable assets
#  • Gzip compression
#  • Hardened security headers

server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # ── Compression ──────────────────────────────────────────────────────────
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 1024;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/json
        application/xml
        application/wasm
        image/svg+xml
        font/woff
        font/woff2;

    # ── Security headers ─────────────────────────────────────────────────────
    add_header X-Frame-Options           "SAMEORIGIN"                          always;
    add_header X-Content-Type-Options    "nosniff"                             always;
    add_header X-XSS-Protection          "1; mode=block"                       always;
    add_header Referrer-Policy           "strict-origin-when-cross-origin"    always;
    add_header Permissions-Policy        "camera=(), microphone=(), geolocation=()" always;
    add_header Cross-Origin-Opener-Policy "same-origin"                        always;
    # SharedArrayBuffer is required by argon2-browser WASM
    add_header Cross-Origin-Embedder-Policy "require-corp"                     always;

    # ── WebAssembly – correct MIME + cache ───────────────────────────────────
    location ~* \.wasm$ {
        default_type application/wasm;
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # ── Immutable static assets ──────────────────────────────────────────────
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|otf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # ── SPA fallback routing ─────────────────────────────────────────────────
    # All unmatched paths serve index.html so React Router can handle routing
    location / {
        try_files $uri $uri/ /index.html =404;
    }

    # ── Health check endpoint ────────────────────────────────────────────────
    location /healthz {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
}