# [matrix #23] SPA routes (/, /home/…, /login/…) are rewritten to /index.html
# inside `location /`, where no cache headers were set: browsers then reused a
# heuristically fresh shell after a deploy and requested deleted assets. Only
# the rewritten shell gets no-cache; other files there keep their defaults.
map $uri $lotus_shell_cache_control {
    /index.html "no-cache, no-store, must-revalidate";
    default     "";
}

# All traffic arrives through Nginx Proxy Manager (10.10.10.27), so without
# realip every visitor shared ONE chat_limit bucket (20 r/s, keyed by
# $binary_remote_addr = the proxy): a scanner burst got real users 503s.
# Each server block below trusts X-Real-IP from the proxy only (NPM sets it
# to the client address, overwriting anything the client sent).
#
# [matrix #22] Decorations get their own, larger budget: opening the profile
# decoration picker can fetch hundreds of thumbnails, which would otherwise use
# up chat_limit and 503 the app's own files.
limit_req_zone $binary_remote_addr zone=decorations_limit:10m rate=100r/s;

server {
    listen 80;
    listen [::]:80;
    server_name chat.lotusguild.org;

    # Brotli compression (better than gzip for modern browsers)
    brotli on;
    brotli_static on;
    brotli_comp_level 6;
    brotli_types text/plain text/css application/javascript application/json
                 image/svg+xml application/wasm font/woff2;

    root /var/www/html;
    server_tokens off;
    client_max_body_size 50m;

    set_real_ip_from 10.10.10.27;
    real_ip_header X-Real-IP;
    limit_req zone=chat_limit burst=60 nodelay;
    limit_conn chat_conn 25;
    index index.html;

    # Security headers (incl. CSP) — see the snippet
    include snippets/cinny-security-headers.conf;
    # HSTS: TLS terminates upstream (this server is listen 80), so this reaches
    # the browser only if the front proxy passes upstream response headers
    # through; otherwise set it at the TLS terminator. includeSubDomains covers
    # all *.lotusguild.org (all HTTPS); `preload` is inert until submitted to
    # hstspreload.org.
    # Permissions-Policy: allow only what the app uses (self) — calls
    # (camera/microphone/display-capture), location share (geolocation), sounds
    # (autoplay), Element Call (fullscreen/encrypted-media) — and deny the rest.

    # Block all source map files and dotfiles from public access
    location ~* \.(js|css)\.map$ {
        deny all;
        return 404;
    }
    location ~ /\. {
        deny all;
        return 404;
    }
    location = /netlify.toml {
        deny all;
        return 404;
    }


    # Service worker must never be cached so updates are picked up immediately
    location = /sw.js {
        include snippets/cinny-security-headers.conf;
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
    }

    # Bundled Element Call: framed by the app itself, so it must not carry the
    # app CSP (frame-ancestors 'none' blocked every web call). Same caching as
    # below: HTML never cached, hashed assets for a year.
    location ^~ /public/element-call/ {
        include snippets/cinny-security-headers-framed.conf;
        location ~* \.html$ {
            include snippets/cinny-security-headers-framed.conf;
            expires -1;
            add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        }
        location ~* \.(?:js|css|woff2?|png|svg|ico|webp|wasm)$ {
            include snippets/cinny-security-headers-framed.conf;
            expires 1y;
            add_header Cache-Control "public, immutable" always;
        }
    }

    # Cache content-addressed static assets aggressively
    location ~* \.(?:js|css|woff2?|png|svg|ico|webp)$ {
        include snippets/cinny-security-headers.conf;
        expires 1y;
        add_header Cache-Control "public, immutable" always;
    }

    # Never cache HTML or JSON (index.html, config.json, manifest.json)
    location ~* \.(json|html)$ {
        include snippets/cinny-security-headers.conf;
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
    }

    # [Gitea #155] PWA share target. The service worker normally answers this
    # POST itself; if it isn't controlling the page yet, land on /share
    # (the shared files are lost, but nothing 405s).
    location = /share-target {
        absolute_redirect off;
        return 303 /share;
    }

    # Auto-deploy webhook — proxied to local webhook service
    location = /hooks/lotus-deploy {
        proxy_pass http://127.0.0.1:9001/hooks/lotus-deploy;
        proxy_set_header Host $host;
        proxy_read_timeout 300;
        proxy_connect_timeout 5;
    }

    # [matrix #22] Avatar decorations, installed by deploy/lxc106-cinny.sh from
    # the Gitea generic package (outside the web root, so app deploys'
    # rsync --delete never touches them). ^~ beats the image regex below: these
    # can be replaced in place under the same name, so a week, not immutable.
    location ^~ /decorations/ {
        alias /var/www/decorations/;
        # Replaces the server-level chat_limit here (nginx doesn't inherit
        # limit_req into a location that sets its own).
        limit_req zone=decorations_limit burst=700 nodelay;
        include snippets/cinny-security-headers.conf;
        add_header Cache-Control "public, max-age=604800" always;
        location ~ /MANIFEST\.sha256$ { return 404; }
    }

    location / {
        # add_header here drops the server-level headers, so include them again.
        include snippets/cinny-security-headers.conf;
        add_header Cache-Control $lotus_shell_cache_control always;
        rewrite ^/config\.json$          /config.json break;
        rewrite ^/manifest\.json$        /manifest.json break;
        rewrite ^/sw\.js$                /sw.js break;
        rewrite ^/pdf\.worker\.min\.js$ /pdf.worker.min.js break;
        rewrite ^/public/(.*)$           /public/$1 break;
        rewrite ^/assets/(.*)$           /assets/$1 break;
        rewrite ^(.+)$                   /index.html break;
    }
}

# [cinny #43] Element Call on its own origin. The web app frames
# https://call.chat.lotusguild.org/public/element-call/index.html (config.json
# `elementCallUrl`), so the call page can no longer read the app's storage
# (login token, crypto store) or use its service worker. Serves ONLY the call
# page — the same files as chat.lotusguild.org/public/element-call/ — and 404s
# everything else, so this hostname exposes nothing new.
server {
    listen 80;
    listen [::]:80;
    server_name call.chat.lotusguild.org;

    brotli on;
    brotli_static on;
    brotli_comp_level 6;
    brotli_types text/plain text/css application/javascript application/json
                 image/svg+xml application/wasm font/woff2;

    root /var/www/html;
    server_tokens off;
    set_real_ip_from 10.10.10.27;
    real_ip_header X-Real-IP;
    limit_req zone=chat_limit burst=60 nodelay;
    limit_conn chat_conn 25;

    include snippets/cinny-security-headers-call.conf;

    location ^~ /public/element-call/ {
        include snippets/cinny-security-headers-call.conf;
        location ~* \.map$ {
            return 404;
        }
        location ~ /\. {
            return 404;
        }
        location ~* \.html$ {
            include snippets/cinny-security-headers-call.conf;
            expires -1;
            add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        }
        location ~* \.(?:js|css|woff2?|png|svg|ico|webp|wasm)$ {
            include snippets/cinny-security-headers-call.conf;
            expires 1y;
            add_header Cache-Control "public, immutable" always;
        }
        try_files $uri =404;
    }

    location / {
        return 404;
    }
}