formbuilder/nginx.conf at main · BavariaByte/formbuilder · GitHub

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server {
    listen 80;
    server_name localhost;
    absolute_redirect off;
    server_tokens off;

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

    # Security headers — applied to every response that nginx generates from this server.
    # CSP is intentionally conservative: same-origin everything, plus data: URIs for images
    # (the app stores user-uploaded images as base64 inside playbook JSON) and inline styles
    # (Vue scoped styles and dynamic style attributes).
    # Clickjacking protection is handled by the CSP `frame-ancestors 'none'` directive below;
    # the deprecated X-Frame-Options header is therefore no longer set.
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=(), interest-cohort=()" always;
    add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; script-src 'self'; font-src 'self' data:; connect-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; form-action 'self'" always;

    # Template playbooks served from mounted volume with auto-discovery.
    # NOTE: autoindex is intentionally on — the template_playbooks/ folder is meant to be
    # publicly listable. Do not place non-public content into the mounted volume.
    location /template_playbooks/ {
        alias /usr/share/nginx/html/template_playbooks/;
        autoindex on;
        autoindex_format json;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        # This location has its own add_header block, so the server-level CSP is NOT
        # inherited — set a minimal CSP here just for clickjacking protection.
        add_header Content-Security-Policy "frame-ancestors 'none'" always;
        add_header Referrer-Policy "no-referrer" always;
    }

    # Cache-busted assets (hashed filenames) — cache aggressively
    location /assets/ {
        add_header Cache-Control "public, max-age=31536000, immutable" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # HTML entry point — always revalidate so updates are picked up immediately
    location / {
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header Referrer-Policy "no-referrer" always;
        add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=(), interest-cohort=()" always;
        add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; script-src 'self'; font-src 'self' data:; connect-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; form-action 'self'" always;
        try_files $uri $uri/ /index.html;
    }
}