{% set domain = "233233.xyz" %}
#
# nginx/sites: reverse proxy to the Chinese Wikipedia:
# * zw.{{ domain }}    -> zh.wikipedia.org
# * zw.{{ domain }}/m/ -> zh.m.wikipedia.org
#
#
# Aaron LI
# 2017-05-23
#

{% if domains_hascert[domain] %}
server {
    listen            443 ssl http2;
    listen       [::]:443 ssl http2;
    server_name  zw.{{ domain }};

    # SSL/TLS Certificate kindly provided by Let's Encrypt
    ssl_certificate      /usr/local/etc/ssl/acme/{{ domain }}/fullchain.pem;
    ssl_certificate_key  /usr/local/etc/ssl/acme/private/{{ domain }}.pem;

    # Enable caching
    #proxy_cache  CACHE;

    # Replace cookie domain
    proxy_cookie_domain  wikipedia.org  $host;

    # Hide some upstream headers to avoid duplicates/overrideing
    proxy_hide_header  Strict-Transport-Security;
    proxy_hide_header  Content-Security-Policy;
    proxy_hide_header  X-Frame-Options;
    proxy_hide_header  X-XSS-Protection;
    proxy_hide_header  X-Content-Type-Options;
    proxy_hide_header  Referrer-Policy;

    # Substitute links in contents
    # NOTE: Require to set Accept-Encoding="" header in order to request
    #       *uncompressed* data from upstream, otherwise won't work!
    sub_filter_types  text/css text/javascript application/json;
    sub_filter_once   off;
    {% block sub_filter_common %}
    sub_filter  //zh.wikipedia.org/    //$host/;
    sub_filter  //zh.m.wikipedia.org/  //$host/m/;
    {% endblock %}

    # Reverse proxy to zh.wikipedia.org
    location / {
        proxy_pass           https://zh.wikipedia.org;

        # Handle the redirection to the mobile version
        proxy_redirect       default;
        proxy_redirect       https://zh.m.wikipedia.org/ /m/;

        # NOTE: The `Host` header cannot be set to `$host`, otherwise,
        #       we get error "Domain not configured" from Wikipedia.
        proxy_set_header  Host               zh.wikipedia.org;
        proxy_set_header  Referer            https://zh.wikipedia.org;
        {% block proxy_set_header_common %}
        proxy_set_header  User-Agent         $http_user_agent;
        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  Cookie             "";
        proxy_set_header  Accept-Encoding    "";
        proxy_set_header  Accept-Language    $http_accept_language;
        {% endblock %}
    }

    # Reverse proxy to zh.m.wikipedia.org
    location ^~ /m/ {
        # NOTE: This `proxy_pass` directive is specified WITH an URI
        #       (i.e., the trailing `/` here), then when a request is
        #       passed to the server, the part of a *normalized*
        #       request URI matching the location is replaced by the
        #       URI specified in the directive.
        # Reference: http://nginx.org/r/proxy_pass
        proxy_pass           https://zh.m.wikipedia.org/;

        # Handle the redirection to the desktop version
        proxy_redirect       default;
        proxy_redirect       https://zh.wikipedia.org/ /;

        proxy_set_header  Host               zh.m.wikipedia.org;
        proxy_set_header  Referer            https://zh.m.wikipedia.org;
        {{ self.proxy_set_header_common() }}

        # All "sub_filter" directives from upper level must be copied here!
        {{ self.sub_filter_common() }}
        sub_filter  /wiki/  /m/wiki/;
    }

    # Forbid spider
    if ($http_user_agent ~* "qihoobot|Baiduspider|Googlebot|Googlebot-Mobile|Googlebot-Image|Mediapartners-Google|Adsbot-Google|Feedfetcher-Google|Yahoo! Slurp|Yahoo! Slurp China|YoudaoBot|Sosospider|Sogou spider|Sogou web spider|MSNBot|ia_archiver|Tomato Bot") {
        return  403;
    }

    location /robots.txt {
        default_type  text/plain;
        return  200  "User-agent: *\nDisallow: /\n";
    }
}
{% endif %}