limit_req_zone $binary_remote_addr zone=thoughtstream_oauth_login:10m rate=6r/m;
limit_req_zone $binary_remote_addr zone=thoughtstream_oauth_callback:10m rate=12r/m;
limit_req_zone $binary_remote_addr zone=thoughtstream_review:10m rate=60r/m;
limit_req_zone $binary_remote_addr zone=thoughtstream_course_chat:10m rate=12r/m;
limit_req_zone $binary_remote_addr zone=thoughtstream_co_chat:10m rate=180r/m;
log_format thoughtstream_no_query '$remote_addr [$time_local] "$request_method $uri $server_protocol" $status $body_bytes_sent';

server {
    listen 80;
    listen [::]:80;
    server_name thought.stream www.thought.stream;
    access_log /var/log/nginx/thought.stream.access.log thoughtstream_no_query;
    error_log /dev/null crit;
    return 308 https://thought.stream$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.thought.stream;

    ssl_certificate /etc/letsencrypt/live/thought.stream/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/thought.stream/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    access_log /var/log/nginx/thought.stream.access.log thoughtstream_no_query;
    error_log /dev/null crit;
    add_header Strict-Transport-Security "max-age=31536000" always;
    return 308 https://thought.stream$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name thought.stream;

    ssl_certificate /etc/letsencrypt/live/thought.stream/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/thought.stream/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    access_log /var/log/nginx/thought.stream.access.log thoughtstream_no_query;
    add_header Strict-Transport-Security "max-age=31536000" always;

    location = /oauth/login {
        client_max_body_size 8k;
        limit_req zone=thoughtstream_oauth_login burst=2 nodelay;
        limit_req_status 429;
        limit_except GET HEAD POST { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location = /oauth/callback {
        access_log off;
        error_log /dev/null crit;
        limit_req zone=thoughtstream_oauth_callback burst=4 nodelay;
        limit_req_status 429;
        limit_except GET HEAD { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location = /oauth/logout {
        client_max_body_size 8k;
        limit_except GET HEAD POST { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location ~ ^/inspector/api/reviews/[^/]+/decisions$ {
        client_max_body_size 100k;
        limit_req zone=thoughtstream_review burst=10 nodelay;
        limit_req_status 429;
        limit_except POST { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location = /inspector/api/courses/post-training/questions {
        client_max_body_size 4k;
        limit_req zone=thoughtstream_course_chat burst=3 nodelay;
        limit_req_status 429;
        limit_except POST { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    # The application admits only its fixed OAuth/Origin/CSRF-checked chat API.
    # No SDK daemon protocol or arbitrary upstream is forwarded.
    location ^~ /chat/api/ {
        access_log off;
        error_log /dev/null crit;
        client_max_body_size 32k;
        limit_req zone=thoughtstream_co_chat burst=12 nodelay;
        limit_req_status 429;
        limit_except GET POST { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 130s;
        proxy_send_timeout 30s;
    }

    location / {
        client_max_body_size 8k;
        limit_except GET HEAD { deny all; }
        proxy_pass http://127.0.0.1:4319;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }
}