map $request_uri $redirect_uri {
    /credibility-indicators         https://learn.civil.co/credibility-indicators;
    /about                          https://learn.civil.co/about;
    /about/                         https://learn.civil.co/about;
    /contact                        https://learn.civil.co/contact;
    /contact/                       https://learn.civil.co/contact;
    /constitution                   https://learn.civil.co/constitution;
    /constitution/                  https://learn.civil.co/constitution;
    /help                           https://learn.civil.co/help;
    /help/                          https://learn.civil.co/help;
    /our-team                       https://learn.civil.co/team;
    /our-team/                      https://learn.civil.co/team;
}

server {
  listen 3000 default_server;
  root /usr/share/nginx/html;
  index index.html index.htm;

  gzip on;
  gzip_disable "msie6";

  gzip_vary on;
  gzip_proxied any;
  gzip_comp_level 6;
  gzip_buffers 16 8k;
  gzip_http_version 1.1;
  gzip_min_length 256;
  gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript application/vnd.ms-fontobject application/x-font-ttf font/opentype image/svg+xml image/x-icon;

  if ( $redirect_uri ) {
      return 301 $redirect_uri;
  }

  location / {
    try_files $uri @prerender;
  }

   ### force utf-8 and content type
  location = /.well-known/apple-developer-merchantid-domain-association {
    types { } default_type "text/plain;charset=utf-8";
    add_header x-robots-tag "noindex, nofollow";
  }

  location @prerender {
        proxy_set_header X-Prerender-Token $PRERENDER_TOKEN;
        
        set $prerender 0;
        if ($http_user_agent ~* "googlebot|bingbot|yandex|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator") {
            set $prerender 1;
        }
        if ($args ~ "_escaped_fragment_") {
            set $prerender 1;
        }
        if ($http_user_agent ~ "Prerender") {
            set $prerender 0;
        }
        if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
            set $prerender 0;
        }
        
        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;
 
        if ($prerender = 1) {
            
            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "service.prerender.io";
            rewrite .* /https://$host$request_uri? break;
            proxy_pass https://$prerender;
        }
        if ($prerender = 0) {
            add_header Cache-Control 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
            rewrite .* /index.html break;
        }
    }

  location /static/ { 
    autoindex off;
    alias /usr/share/nginx/html/static/;
  }

}