#Calendar implementation for the HTWK Leipzig timetable. Evaluation and display of the individual dates in iCal format.
#Copyright (C) 2024 HTWKalender support@htwkalender.de

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU Affero General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU Affero General Public License for more details.

#You should have received a copy of the GNU Affero General Public License
#along with this program.  If not, see <https://www.gnu.org/licenses/>.

worker_processes  4;

error_log  /opt/bitnami/nginx/logs/error.log;
pid        /opt/bitnami/nginx/tmp/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    access_log  /opt/bitnami/nginx/logs/proxy_access.log;
    error_log   /opt/bitnami/nginx/logs/proxy_error.log;

    sendfile        on;
    keepalive_timeout  180s;
    send_timeout 180s;

    client_body_temp_path /opt/bitnami/nginx/tmp/client_temp;
    proxy_temp_path       /opt/bitnami/nginx/tmp/proxy_temp_path;
    fastcgi_temp_path     /opt/bitnami/nginx/tmp/fastcgi_temp;
    uwsgi_temp_path       /opt/bitnami/nginx/tmp/uwsgi_temp;
    scgi_temp_path        /opt/bitnami/nginx/tmp/scgi_temp;

    proxy_buffering on;
    proxy_buffers 8 16k;
    proxy_buffer_size 16k;
    proxy_busy_buffers_size 64k;
    proxy_temp_file_write_size 64k;
    proxy_max_temp_file_size 1024m;

    proxy_set_header    X-Forwarded-Host   $host;
    proxy_set_header    X-Forwarded-Server $host;
    proxy_set_header    X-Forwarded-For    $proxy_add_x_forwarded_for;
    proxy_set_header    X-Forwarded-Proto  $scheme;
    proxy_set_header    X-Real-IP          $remote_addr;
    proxy_set_header    Host               $host;

    geo $admin {
        default 1;
        #10.0.0.0/8 0;     # Private Network
        #127.0.0.0/8 0;    # Localhost Network
        #192.168.0.0/16 0; # Localhost Network
        #141.57.0.0/16 0;  # HTWK Leipzig Network
        #172.16.0.0/12 0;  # Private Network
    }

    map $admin $limit_key {
        0 '';
        1 $binary_remote_addr;
    }

    map $request_method $ratelimit_key {
        POST     $binary_remote_addr;
        default  $binary_remote_addr;
    }

    limit_req_zone $ratelimit_key zone=createFeed:10m rate=1r/s;
    #limit_req_zone $limit_key zone=createFeed:10m rate=1r/m;
    # Limit the number of requests per IP
    limit_req_zone $limit_key zone=feed:20m rate=20r/m;
    limit_req_zone $limit_key zone=modules:10m rate=30r/m;


    server {
        listen              80;
        listen              [::]:80;
        http2               on;

        location /api/feed {
            proxy_pass http://htwkalender-ical:8091;
            client_max_body_size 20m;
            proxy_connect_timeout 600s;
            proxy_read_timeout 600s;
            proxy_send_timeout 600s;
            send_timeout 600s;
            limit_req zone=createFeed nodelay;
        }

        location /api {
            proxy_pass http://htwkalender-data-manager:8090;
            client_max_body_size 20m;
            proxy_connect_timeout 600s;
            proxy_read_timeout 600s;
            proxy_send_timeout 600s;
            send_timeout 600s;
        }

        location /_ {
            proxy_pass http://htwkalender-data-manager:8090;
            # Increase upload file size
            client_max_body_size 100m;
        }

        location / {
            proxy_pass http://htwkalender-frontend:8000;
        }
    }
}