# Run as www-data
user www-data www-data;

# Use two worker processes
worker_processes  2;

# Define PID files
pid /var/run/nginx.pid;

# Define error log
error_log /var/log/nginx/error.log;

events {
    # max clients = worker_processes * worker_connections
    worker_connections  1024;
}

http {
    # Configure MIME types 
    include /etc/nginx/mime.types;
    default_type  application/octet-stream;

    # Configure network details
    sendfile on;
    keepalive_timeout 65;
    tcp_nodelay on;

    # Define access log
    access_log /var/log/nginx/access.log;

    # Configure compression (text/html is compressed by default)
    gzip on;
    gzip_min_length 1100;
    gzip_buffers 4 8k;
    gzip_types text/plain application/x-javascript application/x-shockwave-flash text/css;
    
    #NO CGI SUPPORT IN NGINX fix stat .pl later

    # Define fastcgi backend for web pages
    upstream web_backend {
        server 127.0.0.1:8000;
        server 127.0.0.1:8001;
        server 127.0.0.1:8002;
        server 127.0.0.1:8003;
        server 127.0.0.1:8004;
        server 127.0.0.1:8005;
        server 127.0.0.1:8006;
        server 127.0.0.1:8007;
        server 127.0.0.1:8008;
        server 127.0.0.1:8009;
        server 127.0.0.1:8010;
        server 127.0.0.1:8011;
        server 127.0.0.1:8012;
        server 127.0.0.1:8013;
        server 127.0.0.1:8014;
        server 127.0.0.1:8015;
        server 127.0.0.1:8016;
        server 127.0.0.1:8017;
        server 127.0.0.1:8018;
        server 127.0.0.1:8019;
        server 127.0.0.1:8020;
        server 127.0.0.1:8021;
        server 127.0.0.1:8022;
        server 127.0.0.1:8023;
        server 127.0.0.1:8024;
        server 127.0.0.1:8025;
    }

    # Define fastcgi backend for geocoder searches
    upstream geocoder_backend {
        server 127.0.0.1:8026;
        server 127.0.0.1:8027;
        server 127.0.0.1:8028;
        server 127.0.0.1:8029;
    }

    # Define fastcgi backend for api requests
    upstream api_backend {
        server 127.0.0.1:8030;
        server 127.0.0.1:8031;
        server 127.0.0.1:8032;
        server 127.0.0.1:8033;
        server 127.0.0.1:8034;
        server 127.0.0.1:8035;
        server 127.0.0.1:8036;
        server 127.0.0.1:8037;
        server 127.0.0.1:8038;
        server 127.0.0.1:8039;
        server 127.0.0.1:8040;
        server 127.0.0.1:8041;
        server 127.0.0.1:8042;
        server 127.0.0.1:8043;
        server 127.0.0.1:8044;
    }

    # Define fastcgi backend for bulk api requests
    upstream bulkapi_backend {
        server 10.0.0.10:8000;
        server 10.0.0.11:8000;
        server 10.0.0.12:8000;
        server 10.0.0.10:8001;
        server 10.0.0.11:8001;
        server 10.0.0.12:8001;
        server 10.0.0.10:8002;
        server 10.0.0.11:8002;
        server 10.0.0.12:8002;
        server 10.0.0.10:8003;
        server 10.0.0.11:8003;
        server 10.0.0.12:8003;
        server 10.0.0.10:8004;
        server 10.0.0.11:8004;
        server 10.0.0.12:8004;
    }
    
    # Define fastcgi backend for tiles@home requests
    upstream tah_backend {
        server 10.0.0.10:8005;
        server 10.0.0.11:8005;
        server 10.0.0.12:8005;
    }

    server {
        # Listen on port 80
        listen 80;

        # Serve rails public files
        root /home/rails/public;

        # Use index.html as the index page
        index index.html;

        # Redirect trac requests for historical reasons
        location /trac/ {
            rewrite ^/trac/(.*)$ http://trac.openstreetmap.org/$1 permanent;
        }

        # Redirect wiki requests for historical reasons
        location /wiki/ {
            rewrite ^/wiki/(.*)$ http://wiki.openstreetmap.org/$1 permanent;
        }

        # Placeholder for blocking abuse
        include /etc/nginx/blocked_hosts;
        allow all; 

        # Block some bulk download agents
        if ($http_user_agent ~* LWP::Simple|downloadosm|BBBike) {
            return 403;
        }

        # Block some robots
        if ($http_user_agent ~* msnbot|twiceler) {
            return 403;
        }
 
        # Map api.openstreetmap/0.n/... to api.openstreetmap/api/0.n/...
        if ($host ~* ^api\.) {
            rewrite ^/(0\.[0-9]+)/(.*)$ /api/$1/$2;
            rewrite ^/capabilities$ /api/capabilities;
        }
 
        # Strip asset tags
        location ~ ^/(images|javascripts|openlayers|stylesheets|user/image)/ {
            # Strip asset tags
            rewrite ^/(.*)/[0-9]+$ /$1;

            # Set expiry to the maximum - the asset tag will change
            # when there is a new version
            expires max;

            # Only cache OpenLayers for seven days though
            if ($uri ~ ^/openlayers/) {
                expires 7d;
            }
        }

        # Cache the embedded map page for seven days
        location ~ ^/export/embed.html$ {
            expires 7d;
        }

        # Include fastcgi configuration
        include /etc/nginx/fastcgi_params;
        fastcgi_param REQUEST_URI $uri;

        # Handle tiles@home requests
        location /api/ {
            if ($http_user_agent ~ "^tilesAtHome") {
                #deny all;
                fastcgi_pass tah_backend;
                break;
            }
        }

        # Handle bulk api requests
        location ~ ^/api/0\.6/(map|relation|trackpoints|amf|amf/read|swf/trackpoints|trace/[0-9]+/data)$ {
            fastcgi_read_timeout 300;
            fastcgi_pass bulkapi_backend;
            break;
        }
        
        # Send search requests to the bulk api backend
        location ~ ^/api/0\.6/.*/search$ {
            fastcgi_read_timeout 300;
            fastcgi_pass bulkapi_backend;
            break;
        }

        # Send requests for full objects to the bulk api backend
        location ~ ^/api/0\.6/.*/full$ {
            fastcgi_read_timeout 300;
            fastcgi_pass bulkapi_backend;
            break;
        }

        # Handle the remaining api requests
        location ~ ^/api/0\.6/ {
            fastcgi_pass api_backend;
            break;
        }

        # Deny old and unknown API versions
        location ~ ^/api/0\.[0-9]+/ {
            return 404;
        }
            
        # Send unversioned capabilities requests to the api backend
        location = /api/capabilities {
            fastcgi_pass api_backend;
            break;
        }

        # Send geocoder searches to the geocoder backend
        location /geocoder/ { 
            fastcgi_pass geocoder_backend;
            break;
        }

        # Send everything else to the web backend unless it exists
        # in the rails public tree    
        location / {
            fastcgi_index index.html;

            if (!-f $request_filename) {
                fastcgi_pass web_backend;
                break;
            }
        }

        # Set the MIME type for crossdomain.xml policy files
        # or flash will ignore it
        location ~ /crossdomain\.xml$ {
            types {
                text/x-cross-domain-policy xml;
            }
        }

        # Give munin access to some statistics
        location /server-status {
            stub_status on;
            access_log off;
            allow 127.0.0.1;
            deny all;
        }
    }
}