# nginx example config
# replace {{yourdomain}} and review the certbot/letsencrypt config

limit_req_zone $binary_remote_addr zone=links.hackliberty.org_ratelimit:10m rate=1r/s;

upstream lemmy {
    # this needs to map to the lemmy (server) docker service hostname
    server "lemmy:8536";
}
upstream lemmy-ui {
    # this needs to map to the lemmy-ui docker service hostname
    server "lemmy-ui:1234";
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name links.hackliberty.org;

    ssl_certificate /config/keys/cert.crt;
    ssl_certificate_key /config/keys/cert.key;

    # Various TLS hardening settings
    # https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
    ssl_session_timeout  10m;
    ssl_session_cache shared:SSL:10m;
    ssl_session_tickets on;
    ssl_stapling on;
    ssl_stapling_verify on;

    # Hide nginx version
    server_tokens off;

    # Enable compression for JS/CSS/HTML bundle, for improved client load times.
    # It might be nice to compress JSON, but leaving that out to protect against potential
    # compression+encryption information leak attacks like BREACH.
    gzip on;
    gzip_types text/css application/javascript image/svg+xml;
    gzip_vary on;

    # Handle Tor Browser's ".onion" link detection
    add_header Onion-Location "http://snb3ufnp67uudsu25epj43schrerbk7o5qlisr7ph6a3wiez7vxfjxqd.onion$request_uri" always;

    # Only connect to this site via HTTPS for the two years
    add_header Strict-Transport-Security "max-age=63072000";

    # Various content security headers
    add_header Referrer-Policy "same-origin";
    add_header X-Content-Type-Options "nosniff";
    add_header X-Frame-Options "DENY";
    add_header X-XSS-Protection "1; mode=block";

    # Upload limit for pictrs
    client_max_body_size 20M;

    # frontend
    location / {
        # distinguish between ui requests and backend
        # don't change lemmy-ui or lemmy here, they refer to the upstream definitions on top
        set $proxpass "http://lemmy-ui";

        if ($http_accept = "application/activity+json") {
            set $proxpass "http://lemmy";
        }
        if ($http_accept = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
            set $proxpass "http://lemmy";
        }
        if ($request_method = POST) {
            set $proxpass "http://lemmy";
        }
        proxy_pass $proxpass;

        rewrite ^(.+)/+$ $1 permanent;

        # Send actual client IP upstream
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # backend
    location ~ ^/(api|feeds|nodeinfo|.well-known) {
        proxy_pass "http://lemmy";
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Rate limit
        limit_req zone=links.hackliberty.org_ratelimit burst=30 nodelay;

        # Add IP forwarding headers
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # pictrs only - for adding browser cache control.
    location ~ ^/(pictrs) {
        # allow browser cache, images never update, we can apply long term cache
        expires 120d;
        add_header Pragma "public";
        add_header Cache-Control "public";

        proxy_pass "http://lemmy";
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Rate limit
        limit_req zone=links.hackliberty.org_ratelimit burst=30 nodelay;

        # Add IP forwarding headers
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # Redirect pictshare images to pictrs
    location ~ /pictshare/(.*)$ {
        return 301 /pictrs/image/$1;
    }
}


# Establish a rate limit for the hidden service address
    limit_req_zone $binary_remote_addr zone=snb3ufnp67uudsu25epj43schrerbk7o5qlisr7ph6a3wiez7vxfjxqd.onion_ratelimit:10m rate=1r/s;

    # Add tor-specific upstream aliases as a visual aid to
    # avoid editing the incorrect server block in the future
    upstream lemmy-tor {
        server "lemmy:8536";
    }
    upstream lemmy-ui-tor {
        server "lemmy-ui:1234";
    }

    # Add a copy of your current internet-facing configuration with
    # "listen" and "server_listen" modified to send all traffic
    # over the Tor network, incorporating the visual upstream aliases
    # above.
    server {
        # Tell nginx to listen on the hidden service port
        listen 10080;

        # Set server_name to the contents of the file:
        # /var/lib/tor/hidden_lemmy_service/hostname
        server_name snb3ufnp67uudsu25epj43schrerbk7o5qlisr7ph6a3wiez7vxfjxqd.onion;

        # Hide nginx version
        server_tokens off;

        # Enable compression for JS/CSS/HTML bundle, for improved client load times.
        # It might be nice to compress JSON, but leaving that out to protect against potential
        # compression+encryption information leak attacks like BREACH.
        gzip on;
        gzip_types text/css application/javascript image/svg+xml;
        gzip_vary on;

        # Various content security headers
        add_header Referrer-Policy "same-origin";
        add_header X-Content-Type-Options "nosniff";
        add_header X-Frame-Options "DENY";
        add_header X-XSS-Protection "1; mode=block";

        # Upload limit for pictrs
        client_max_body_size 20M;

        # frontend
        location / {
            # distinguish between ui requests and backend
            # don't change lemmy-ui or lemmy here, they refer to the upstream definitions on top
            set $proxpass "http://lemmy-ui-tor";

            if ($http_accept = "application/activity+json") {
                set $proxpass "http://lemmy-tor";
            }
            if ($http_accept = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
                set $proxpass "http://lemmy-tor";
            }
            if ($request_method = POST) {
                set $proxpass "http://lemmy-tor";
            }
            proxy_pass $proxpass;

            rewrite ^(.+)/+$ $1 permanent;

            # Send actual client IP upstream
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # backend
        location ~ ^/(api|feeds|nodeinfo|.well-known) {
            proxy_pass "http://lemmy-tor";
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Rate limit
            limit_req zone=snb3ufnp67uudsu25epj43schrerbk7o5qlisr7ph6a3wiez7vxfjxqd.onion_ratelimit burst=30 nodelay;

            # Add IP forwarding headers
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # pictrs only - for adding browser cache control.
        location ~ ^/(pictrs) {
            # allow browser cache, images never update, we can apply long term cache
            expires 120d;
            add_header Pragma "public";
            add_header Cache-Control "public";

            proxy_pass "http://lemmy-tor";
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Rate limit
            limit_req zone=snb3ufnp67uudsu25epj43schrerbk7o5qlisr7ph6a3wiez7vxfjxqd.onion_ratelimit burst=30 nodelay;

            # Add IP forwarding headers
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # Redirect pictshare images to pictrs
        location ~ /pictshare/(.*)$ {
            return 301 /pictrs/image/$1;
        }
    }