tCMS/lib/Trog/Routes/HTML.pm

package Trog::Routes::HTML;

use strict;
use warnings;

no warnings 'experimental';
use feature qw{signatures state};

use Errno qw{ENOENT};
use File::Touch();
use List::Util();
use List::MoreUtils();
use Capture::Tiny qw{capture};
use HTML::SocialMeta;

use Encode qw{encode_utf8};
use IO::Compress::Gzip;
use CSS::Minifier::XS;
use Path::Tiny();
use File::Basename qw{dirname};
use URI();

use Trog::Log qw{:all};
use Trog::Utils;
use Trog::Config;
use Trog::Auth;
use Trog::Data;
use Trog::FileHandler;

my $conf         = Trog::Config::get();
my $template_dir = 'www/templates';
my $theme_dir    = '';
$theme_dir = "themes/" . $conf->param('general.theme') if $conf->param('general.theme') && -d "www/themes/" . $conf->param('general.theme');
my $td = $theme_dir ? "/$theme_dir" : '';

use lib 'www';

our $landing_page = 'default.tx';
our $htmltitle    = 'title.tx';
our $midtitle     = 'midtitle.tx';
our $rightbar     = 'rightbar.tx';
our $leftbar      = 'leftbar.tx';
our $topbar       = 'topbar.tx';
our $footbar      = 'footbar.tx';

# Note to maintainers: never ever remove backends from this list.
# the auth => 1 is a crucial protection.
our %routes = (
    default => {
        callback => \&Trog::Routes::HTML::setup,
    },
    '/index' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::index,
    },

    #Deal with most indexDocument directives interfering with proxied requests to /
    #TODO replace with alias routes
    '/index.html' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::index,
    },
    '/index.php' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::index,
    },

    # This should only be enabled to debug
    #    '/setup' => {
    #        method   => 'GET',
    #        callback => \&Trog::Routes::HTML::setup,
    #    },
    '/login' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::login,
    },
    '/logout' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::logout,
    },
    '/auth' => {
        method   => 'POST',
        callback => \&Trog::Routes::HTML::login,
    },
    '/totp' => {
        method   => 'GET',
        auth     => 1,
        callback => \&Trog::Routes::HTML::totp,
    },
    '/post/save' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::post_save,
    },
    '/post/delete' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::post_delete,
    },
    '/config/save' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::config_save,
    },
    '/themeclone' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::themeclone,
    },
    '/profile' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::profile,
    },
    '/manual' => {
        method   => 'GET',
        auth     => 1,
        callback => \&Trog::Routes::HTML::manual,
    },
    '/lib/(.*)' => {
        method   => 'GET',
        auth     => 1,
        captures => ['module'],
        callback => \&Trog::Routes::HTML::manual,
    },

    #TODO transform into posts?
    '/sitemap',
    => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
    },
    '/sitemap_index.xml',
    => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1 },
    },
    '/sitemap_index.xml.gz',
    => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1 },
    },
    '/sitemap/static.xml' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, map => 'static' },
    },
    '/sitemap/static.xml.gz' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1, map => 'static' },
    },
    '/sitemap/(.*).xml' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1 },
        captures => ['map'],
    },
    '/sitemap/(.*).xml.gz' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1 },
        captures => ['map'],
    },
    '/robots.txt' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::robots,
    },
    '/humans.txt' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::posts,
        data     => { tag => ['about'] },
    },
    '/styles/avatars.css' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::avatars,
        data     => { tag => ['about'] },
    },
    '/favicon.ico' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::icon,
    },
    '/styles/rss-style.xsl' => {
        method => 'GET',
        callback => \&Trog::Routes::HTML::rss_style,
    },
    '/rss.xml' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::posts,
        data     => { format => 'rss' },
    }
);

# Grab theme routes
my $themed = 0;
if ($theme_dir) {
    my $theme_mod = "$theme_dir/routes.pm";
    if ( -f "www/$theme_mod" ) {
        require $theme_mod;
        @routes{ keys(%Theme::routes) } = values(%Theme::routes);
        $themed = 1;
    }
}

my $data = Trog::Data->new($conf);

=head1 PRIMARY ROUTE

=head2 index

Implements the primary route used by all pages not behind auth.
Most subsequent functions simply pass content to this function.

=cut

sub index ( $query, $content = '', $i_styles = [] ) {
    $query->{theme_dir} = $td;

    $content ||= themed_render( $landing_page, $query );

    my @styles = ('/styles/avatars.css');
    if ($theme_dir) {
        if ( $query->{embed} ) {
            unshift( @styles, _themed_style("embed.css") ) if -f 'www/' . _themed_style("embed.css");
        }
        unshift( @styles, _themed_style("screen.css") )    if -f 'www/' . _themed_style("screen.css");
        unshift( @styles, _themed_style("print.css") )     if -f 'www/' . _themed_style("print.css");
        unshift( @styles, _themed_style("structure.css") ) if -f 'www/' . _themed_style("structure.css");
    }
    push( @styles, @$i_styles );

    #TODO allow theming of print css
    my @series = _get_series(0);

    my $title = $query->{primary_post}{title} // $query->{title} // $Theme::default_title // 'tCMS';

    # Handle link "unfurling" correctly
    my ( $default_tags, $meta_desc, $meta_tags ) = _build_social_meta( $query, $title );

    #Do embed content
    my $tmpl = $query->{embed} ? 'embed.tx' : 'index.tx';
    return finish_render(
        $tmpl,
        {
            %$query,
            search_lang  => $data->lang(),
            search_help  => $data->help(),
            theme_dir    => $td,
            content      => $content,
            title        => $title,
            htmltitle    => themed_render( $htmltitle, $query ),
            midtitle     => themed_render( $midtitle,  $query ),
            rightbar     => themed_render( $rightbar,  $query ),
            leftbar      => themed_render( $leftbar,   $query ),
            topbar       => themed_render( $topbar,    $query ),
            footbar      => themed_render( $footbar,   $query ),
            categories   => \@series,
            stylesheets  => \@styles,
            show_madeby  => $Theme::show_madeby ? 1 : 0,
            embed        => $query->{embed}     ? 1 : 0,
            embed_video  => $query->{primary_post}{is_video},
            default_tags => $default_tags,
            meta_desc    => $meta_desc,
            meta_tags    => $meta_tags,
        }
    );
}

sub _build_social_meta ( $query, $title ) {
    return ( undef, undef, undef ) unless $query->{social_meta} && $query->{route} && $query->{domain};

    my $default_tags = $Theme::default_tags;
    $default_tags .= ',' . join( ',', @{ $query->{primary_post}->{tags} } ) if $default_tags && $query->{primary_post}->{tags};

    my $meta_desc = $query->{primary_post}{data} // $Theme::description // "tCMS Site";
    $meta_desc = Trog::Utils::strip_and_trunc($meta_desc) || '';

    my $meta_tags = '';
    my $card_type = 'summary';
    $card_type = 'featured_image' if $query->{primary_post} && $query->{primary_post}{is_image};
    $card_type = 'player'         if $query->{primary_post} && $query->{primary_post}{is_video};

    my $image = $Theme::default_image ? "https://$query->{domain}/$td/$Theme::default_image" : '';
    $image = "https://$query->{domain}/$query->{primary_post}{preview}" if $query->{primary_post} && $query->{primary_post}{preview};
    $image = "https://$query->{domain}/$query->{primary_post}{href}"    if $query->{primary_post} && $query->{primary_post}{is_image};

    my $primary_route = "https://$query->{domain}/$query->{route}";
    $primary_route =~ s/[\/]+/\//g;

    my $display_name = $Theme::display_name // 'Another tCMS Site';

    my $extra_tags = '';

    my %sopts = (
        site_name   => $display_name,
        app_name    => $display_name,
        title       => $title,
        description => $meta_desc,
        url         => $primary_route,
    );
    $sopts{site}      = $Theme::twitter_account if $Theme::twitter_account;
    $sopts{image}     = $image                  if $image;
    $sopts{fb_app_id} = $Theme::fb_app_id       if $Theme::fb_app_id;
    if ( $query->{primary_post} && $query->{primary_post}{is_video} ) {

        #$sopts{player} = "$primary_route?embed=1";
        $sopts{player} = "https://$query->{domain}/$query->{primary_post}{href}";

        #XXX don't hardcode this
        $sopts{player_width}  = 1280;
        $sopts{player_height} = 720;
        $extra_tags .= "<meta property='og:video:type' content='$query->{primary_post}{content_type}' />\n";
    }
    my $social = HTML::SocialMeta->new(%sopts);
    $meta_tags = eval { $social->create($card_type) };
    $meta_tags =~ s/content="video"/content="video:other"/mg if $meta_tags;
    $meta_tags .= $extra_tags                                if $extra_tags;

    print STDERR "WARNING: Theme misconfigured, social media tags will not be included\n$@\n" if $theme_dir && !$meta_tags;
    return ( $default_tags, $meta_desc, $meta_tags );
}

=head1 ADMIN ROUTES

These are things that issue returns other than 200, and are not directly accessible by users via any defined route.

=head2 notfound, forbidden, badrequest

Implements the 4XX status codes.  Override templates named the same for theming this.

=cut

sub _generic_route ( $rname, $code, $title, $query ) {
    $query->{code} = $code;
    $query->{route} //= $rname;
    $query->{title} = $title;
    my $styles  = _build_themed_styles("$rname.css");
    my $content = themed_render(
        "$rname.tx",
        {
            title   => $title,
            route   => $query->{route},
            user    => $query->{user},
            styles  => $styles,
            deflate => $query->{deflate},
        }
    );
    return Trog::Routes::HTML::index( $query, $content, $styles );
}

sub notfound (@args) {
    return _generic_route( 'notfound', 404, "Return to sender, Address unknown", @args );
}

sub forbidden (@args) {
    return _generic_route( 'forbidden', 403, "STAY OUT YOU RED MENACE", @args );
}

sub badrequest (@args) {
    return _generic_route( 'badrequest', 400, "Bad Request", @args );
}

sub toolong (@args) {
    return _generic_route( 'toolong', 419, "URI too long", @args );
}

=head2 redirect, redirect_permanent, see_also

Redirects to the provided page.

=cut

sub redirect ($to) {
    return [ 302, [ "Location" => $to ], [''] ];
}

sub redirect_permanent ($to) {
    return [ 301, [ "Location" => $to ], [''] ];
}

sub see_also ($to) {
    return [ 303, [ "Location" => $to ], [''] ];
}

=head1 NORMAL ROUTES

These are expected to either return a 200, or redirect to something which does.

=head2 robots

Return an appropriate robots.txt

=cut

sub robots ($query) {
    state $etag = "robots-" . time();
    return finish_render( undef, { etag => $etag, contenttype => 'text/plain', body => encode_utf8( themed_render( 'robots.tx', { domain => $query->{domain} } ) ) } );
}

=head2 setup

One time setup page; should only display to the first user to visit the site which we presume to be the administrator.

=cut

sub setup ($query) {
    File::Touch::touch("config/setup");
    return finish_render(
        'notconfigured.tx',
        {
            title       => 'tCMS Requires Setup to Continue...',
            stylesheets => _build_themed_styles('notconfigured.css'),
            scheme      => $query->{scheme},
        }
    );
}

=head2 totp

Enable 2 factor auth via TOTP for the currently authenticated user.
Returns a page with a QR code & TOTP uri for pasting into your authenticator app of choice.

=cut

sub totp ($query) {
    my $active_user = $query->{user};
    my $domain      = $query->{domain};
    my ( $uri, $qr, $failure, $message ) = Trog::Auth::totp( $active_user, $domain );

    return finish_render(
        'totp.tx',
        {
            title       => 'Enable TOTP 2-Factor Auth',
            theme_dir   => $td,
            uri         => $uri,
            qr          => $qr,
            failure     => $failure,
            message     => $message,
            stylesheets => _build_themed_styles('post.css'),
            scheme      => $query->{scheme},
        }
    );
}

=head2 login

Sets the user cookie if the provided user exists, or sets up the user as an admin with the provided credentials in the event that no users exist.

=cut

sub login ($query) {

    # Redirect if we actually have a logged in user.
    # Note to future me -- this user value is overwritten explicitly in server.psgi.
    # If that ever changes, you will die
    $query->{to} //= $query->{route};
    $query->{to} = '/config' if $query->{to} eq '/login';
    if ( $query->{user} ) {
        return see_also( $query->{to} );
    }

    #Check and see if we have no users.  If so we will just accept whatever creds are passed.
    my $hasusers = -f "config/has_users";
    my $btnmsg   = $hasusers ? "Log In" : "Register";

    my @headers;
    my $has_totp = 0;
    if ( $query->{username} && $query->{password} ) {
        if ( !$hasusers ) {

            # Make the first user
            Trog::Auth::useradd( $query->{username}, $query->{password}, ['admin'] );

            # Add a stub user page and the initial series.
            my $dat = Trog::Data->new($conf);
            _setup_initial_db( $dat, $query->{username} );

            # Ensure we stop registering new users
            File::Touch::touch("config/has_users");
        }

        $query->{failed} = 1;
        my $cookie = Trog::Auth::mksession( $query->{username}, $query->{password}, $query->{token} );
        if ($cookie) {

            # TODO secure / sameSite cookie to kill csrf, maybe do rememberme with Expires=~0
            my $secure = '';
            $secure  = '; Secure' if $query->{scheme} eq 'https';
            @headers = (
                "Set-Cookie" => "tcmslogin=$cookie; HttpOnly; SameSite=Strict$secure",
            );
            $query->{failed} = 0;
        }
    }

    $query->{failed} //= -1;
    return finish_render(
        'login.tx',
        {
            title       => 'tCMS 2 ~ Login',
            to          => $query->{to},
            failure     => int( $query->{failed} ),
            message     => int( $query->{failed} ) < 1 ? "Login Successful, Redirecting..." : "Login Failed.",
            btnmsg      => $btnmsg,
            stylesheets => _build_themed_styles('login.css'),
            theme_dir   => $td,
            scheme      => $query->{scheme},
        },
        @headers
    );
}

sub _setup_initial_db ( $dat, $user ) {
    $dat->add(
        {
            "aclname"    => "series",
            "acls"       => [],
            "callback"   => "Trog::Routes::HTML::series",
            method       => 'GET',
            "data"       => "Series",
            "href"       => "/series",
            "local_href" => "/series",
            "preview"    => "/img/sys/testpattern.jpg",
            "tags"       => [qw{series topbar}],
            visibility   => 'public',
            "title"      => "Series",
            user         => $user,
            form         => 'series.tx',
            child_form   => 'series.tx',
            aliases      => [],
        },
        {
            "aclname"    => "about",
            "acls"       => [],
            "callback"   => "Trog::Routes::HTML::series",
            method       => 'GET',
            "data"       => "About",
            "href"       => "/about",
            "local_href" => "/about",
            "preview"    => "/img/sys/testpattern.jpg",
            "tags"       => [qw{series topbar public}],
            visibility   => 'public',
            "title"      => "About",
            user         => $user,
            form         => 'series.tx',
            child_form   => 'profile.tx',
            aliases      => [],
        },
        {
            "aclname"      => "config",
            acls           => [],
            "callback"     => "Trog::Routes::HTML::config",
            'method'       => 'GET',
            "content_type" => "text/html",
            "data"         => "Config",
            "href"         => "/config",
            "local_href"   => "/config",
            "preview"      => "/img/sys/testpattern.jpg",
            "tags"         => [qw{admin}],
            visibility     => 'private',
            "title"        => "Configure tCMS",
            user           => $user,
            aliases        => [],
        },
        {
            title      => $user,
            data       => 'Default user',
            preview    => '/img/avatar/humm.gif',
            wallpaper  => '/img/sys/testpattern.jpg',
            tags       => ['about'],
            visibility => 'public',
            acls       => ['admin'],
            local_href => "/users/$user",
            callback   => "Trog::Routes::HTML::users",
            method     => 'GET',
            user       => $user,
            form       => 'profile.tx',
            aliases    => [],
        },
    );
}

=head2 logout

Deletes your users' session and opens the index.

=cut

sub logout ($query) {
    Trog::Auth::killsession( $query->{user} ) if $query->{user};
    delete $query->{user};
    return Trog::Routes::HTML::index($query);
}

=head2 config

Renders the configuration page, or redirects you back to the login page.

=cut

sub config ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    my $css = _build_themed_styles('config.css');
    my $js  = _build_themed_scripts('post.js');

    $query->{failure} //= -1;

    return finish_render(
        'config.tx',
        {
            title              => 'Configure tCMS',
            theme_dir          => $td,
            stylesheets        => $css,
            scripts            => $js,
            themes             => _get_themes() || [],
            data_models        => _get_data_models(),
            current_theme      => $conf->param('general.theme')      // '',
            current_data_model => $conf->param('general.data_model') // 'DUMMY',
            totp_secret        => $conf->param('totp.secret'),
            message            => $query->{message},
            failure            => $query->{failure},
            to                 => '/config',
            scheme             => $query->{scheme},
            embeds             => $conf->param('security.allow_embeds_from') // '',
        }
    );
}

sub _get_series ( $edit = 0 ) {
    my @series = $data->get(
        acls  => [qw{public}],
        tags  => [qw{topbar}],
        limit => 10,
        page  => 1,
    );
    @series = map { $_->{local_href} = "/post$_->{local_href}"; $_ } @series if $edit;
    return @series;
}

sub _get_themes {
    my $dir = 'www/themes';
    opendir( my $dh, $dir ) || do { die "Can't opendir $dir: $!" unless $!{ENOENT} };
    my @tdirs = grep { !/^\./ && -d "$dir/$_" } readdir($dh);
    closedir $dh;
    return \@tdirs;
}

sub _get_data_models {
    my $dir = 'lib/Trog/Data';
    opendir( my $dh, $dir ) || die "Can't opendir $dir: $!";
    my @dmods = map { s/\.pm$//g; $_ } grep { /\.pm$/ && -f "$dir/$_" } readdir($dh);
    closedir $dh;
    return \@dmods;
}

=head2 config_save

Implements /config/save route.  Saves what little configuration we actually use to ~/.tcms/tcms.conf

=cut

sub config_save ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    $conf->param( 'general.theme',      $query->{theme} )      if defined $query->{theme};
    $conf->param( 'general.data_model', $query->{data_model} ) if $query->{data_model};

    # Erase all TOTP secrets in the event we change the global secret
    if ( $query->{totp_secret} ) {
        $conf->param( 'totp.secret', $query->{totp_secret} );
        Trog::Auth::clear_totp();
    }

    $query->{failure} = 1;
    $query->{message} = "Failed to save configuration!";
    if ( $conf->write($Trog::Config::home_cfg) ) {
        $query->{failure} = 0;
        $query->{message} = "Configuration updated succesfully.";
    }

    #Get the PID of the parent port using lsof, send HUP
    my $parent = getppid;
    kill 'HUP', $parent;

    return config($query);
}

=head2 themeclone

Clone a theme by copying a directory.

=cut

sub themeclone ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    my ( $theme, $newtheme ) = ( $query->{theme}, $query->{newtheme} );

    my $themedir = 'www/themes';

    $query->{failure} = 1;
    $query->{message} = "Failed to clone theme '$theme' as '$newtheme'!";
    require File::Copy::Recursive;
    if ( $theme && $newtheme && File::Copy::Recursive::dircopy( "$themedir/$theme", "$themedir/$newtheme" ) ) {
        $query->{failure} = 0;
        $query->{message} = "Successfully cloned theme '$theme' as '$newtheme'.";
    }
    return see_also('/config');
}

=head2 post_save

Saves posts submitted via the /post pages

=cut

sub post_save ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    my $to = delete $query->{to};

    #Copy this down since it will be deleted later
    my $acls = $query->{acls};

    $query->{tags} = _coerce_array( $query->{tags} );

    # Filter bits and bobs
    delete $query->{primary_post};
    delete $query->{social_meta};
    delete $query->{deflate};
    delete $query->{acls};

    # Ensure there are no null tags
    @{ $query->{tags} } = grep { defined $_ } @{ $query->{tags} };

    $data->add($query) and die "Could not add post";
    return see_also($to);
}

=head2 profile

Saves / updates new users.

=cut

sub profile ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    #TODO allow users to do something OTHER than be admins
    if ( $query->{password} ) {
        Trog::Auth::useradd( $query->{username}, $query->{password}, ['admin'] );
    }

    #Make sure it is "self-authored", redact pw
    $query->{user} = delete $query->{username};
    delete $query->{password};

    return post_save($query);
}

=head2 post_delete

deletes posts.

=cut

sub post_delete ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    $data->delete($query) and die "Could not delete post";
    return see_also( $query->{to} );
}

=head2 series

Series specific view, much like the users/ route
Displays identified series, not all series.

=cut

sub series ($query) {
    my $is_admin = grep { $_ eq 'admin' } @{ $query->{user_acls} };

    #we are either viewed one of two ways, /post/$id or /$aclname
    my ( undef, $aclname, $id ) = split( /\//, $query->{route} );
    $query->{aclname} = $aclname if !$id;
    $query->{id}      = $id      if $id;

    # Don't show topbar series on the series page.  That said, don't exclude it from direct series view.
    $query->{exclude_tags} = ['topbar'] if !$is_admin && $aclname && $aclname eq 'series';

    #XXX I'd prefer to overload id to actually *be* the aclname...
    # but this way, accomodates things like the flat file time-indexing hack.
    # TODO I should probably have it for all posts, and make *everything* a series.
    # WE can then do threaded comments/posts.
    # That will essentially necessitate it *becoming* the ID for real.

    #Grab the relevant tag (aclname), then pass that to posts
    my @posts = _post_helper( $query, ['series'], $query->{user_acls} );

    delete $query->{id};
    delete $query->{aclname};

    $query->{subhead}      = $posts[0]->{data};
    $query->{title}        = $posts[0]->{title};
    $query->{tag}          = $posts[0]->{aclname};
    $query->{primary_post} = $posts[0];
    $query->{in_series}    = 1;

    return posts($query);
}

=head2 avatars

Returns the avatars.css.

=cut

sub avatars ($query) {
    push( @{ $query->{user_acls} }, 'public' );
    my $tags = _coerce_array( $query->{tag} );

    my @posts = _post_helper( $query, $tags, $query->{user_acls} );

    $query->{body} = encode_utf8(
        CSS::Minifier::XS::minify(
            themed_render(
                'avatars.tx',
                {
                    users => \@posts,
                }
            )
        )
    );

    $query->{contenttype} = "text/css";
    if (@posts) {

        # Set the eTag so that we don't get a re-fetch
        $query->{etag} = "$posts[0]{id}-$posts[0]{version}";
    }

    return finish_render( undef, $query );
}

=head2 users

Implements direct user profile view.

=cut

sub users ($query) {

    # Capture the username
    my ( undef, undef, $username ) = split( /\//, $query->{route} );

    $query->{username} //= $username;
    push( @{ $query->{user_acls} }, 'public' );
    $query->{exclude_tags} = ['about'];

    # Don't show topbar series on the series page.  That said, don't exclude it from direct series view.
    my $is_admin = grep { $_ eq 'admin' } @{ $query->{user_acls} };
    push( @{ $query->{exclude_tags} }, 'topbar' ) if !$is_admin;

    my @posts = _post_helper( { author => $query->{username} }, ['about'], $query->{user_acls} );
    $query->{id}           = $posts[0]->{id};
    $query->{title}        = $posts[0]->{title};
    $query->{user_obj}     = $posts[0];
    $query->{primary_post} = $posts[0];
    $query->{in_series}    = 1;
    return posts($query);
}

=head2 posts

Display multi or single posts, supports RSS and pagination.

=cut

sub posts ( $query, $direct = 0 ) {

    # Allow rss.xml to tell what posts to loop over
    my $fmt = $query->{format} || '';
    my $for = URI->new($query->{for} || '')->path() || $query->{route};
    $query->{route} = $for if $fmt eq 'rss';

    #Process the input URI to capture tag/id
    $query->{route} //= $query->{to};
    my ( undef, undef, $id ) = split( /\//, $query->{route} );

    my $tags = _coerce_array( $query->{tag} );
    $query->{id} = $id if $id && !$query->{in_series};

    my $is_admin = grep { $_ eq 'admin' } @{ $query->{user_acls} };
    push( @{ $query->{user_acls} }, 'public' );
    push( @{ $query->{user_acls} }, 'unlisted' ) if $query->{id};
    push( @{ $query->{user_acls} }, 'private' )  if $is_admin;
    my @posts;

    # Discover this user's visibility, so we can make them post in this category by default
    my $user_visibility = 'public';

    if ( $query->{user_obj} ) {

        #Optimize the /users/* route
        @posts           = ( $query->{user_obj} );
        $user_visibility = $query->{user_obj}->{visibility};
    }
    else {
        if ( $query->{user} ) {
            my @me = _post_helper( { author => $query->{user} }, ['about'], $query->{user_acls} );
            $user_visibility = $me[0]->{visibility};
        }
        @posts = _post_helper( $query, $tags, $query->{user_acls} );
    }

    if ( $query->{id} ) {
        $query->{primary_post} = $posts[0] if @posts;
    }

    #OK, so if we have a user as the ID we found, go grab the rest of their posts
    if ( $query->{id} && @posts && List::Util::any { $_ eq 'about' } @{ $posts[0]->{tags} } ) {
        my $user = shift(@posts);
        my $id   = delete $query->{id};
        $query->{author} = $user->{user};
        @posts           = _post_helper( $query, $tags, $query->{user_acls} );
        @posts           = grep { $_->{id} ne $id } @posts;
        unshift @posts, $user;
    }

    if ( !$is_admin ) {
        return notfound($query) unless @posts;
    }

    # Set the eTag so that we don't get a re-fetch
    $query->{etag} = "$posts[0]{id}-$posts[0]{version}" if @posts;

    return _rss( $query, \@posts ) if $fmt eq 'rss';

    #XXX Is used by the sitemap, maybe just fix there?
    my @post_aliases = map { $_->{local_href} } _get_series();

    my ( $header, $footer );
    $header = themed_render( 'headers/' . $query->{primary_post}{header}, { theme_dir => $td } ) if $query->{primary_post}{header};
    $footer = themed_render( 'footers/' . $query->{primary_post}{footer}, { theme_dir => $td } ) if $query->{primary_post}{footer};

    # List the available headers/footers
    my $headers = _templates_in_dir( -d $theme_dir ? "www/$theme_dir/templates/headers" : "www/templates/headers" );
    my $footers = _templates_in_dir( -d $theme_dir ? "www/$theme_dir/templates/footers" : "www/templates/footers" );

    my $styles = _build_themed_styles('posts.css');

    #Correct page headers
    my $ph = $themed ? _themed_title( $query->{route} ) : $query->{route};

    # Build page title if it wasn't set by a wrapping sub
    $query->{title} = "$query->{domain} : $query->{title}" if $query->{title} && $query->{domain};
    $query->{title} ||= @$tags && $query->{domain} ? "$query->{domain} : @$tags" : undef;

    #Handle paginator vars
    my $limit       = int( $query->{limit} || 25 );
    my $now_year    = ( localtime(time) )[5] + 1900;
    my $oldest_year = $now_year - 20;                  #XXX actually find oldest post year

    # Handle post style.
    if ( $query->{style} ) {
        undef $header;
        undef $footer;
    }

    my $older = !@posts ? 0 : $posts[-1]->{created};
    $query->{failure} //= -1;
    $query->{id}      //= '';
    my $newer = !@posts ? 0 : $posts[0]->{created};

    #XXX messed up data has to be fixed unfortunately
    @$tags = List::Util::uniq @$tags;

    #Filter displaying visibility tags
    my @visibuddies = qw{public unlisted private};
    foreach my $post (@posts) {
        @{ $post->{tags} } = grep {
            my $tag = $_;
            !grep { $tag eq $_ } @visibuddies
        } @{ $post->{tags} };
    }

    #XXX note that we are explicitly relying on the first tag to be the ACL
    my $aclselected = $tags->[0] || '';
    my @acls        = map {
        $_->{selected} = $_->{aclname} eq $aclselected ? 'selected' : '';
        $_
    } _post_helper( {}, ['series'], $query->{user_acls} );

    my $forms = _templates_in_dir("$template_dir/forms");

    my $edittype = $query->{primary_post} ? $query->{primary_post}->{child_form}          : $query->{form};
    my $tiled    = $query->{primary_post} ? !$is_admin && $query->{primary_post}->{tiled} : 0;

    # Grab the rest of the tags to dump into the edit form
    my @tags_all = $data->tags();

    #Filter out the visibilities and special series tags
    @tags_all = grep {
        my $subj = $_;
        scalar( grep { $_ eq $subj } qw{public private unlisted admin series about topbar} ) == 0
    } @tags_all;

    @posts = map {
        my $subject = $_;
        my @et      = grep {
            my $subj = $_;
            grep { $subj eq $_ } @tags_all
        } @{ $subject->{tags} };
        @et = grep { $_ ne $aclselected } @et;
        $_->{extra_tags} = \@et;
        $_
    } @posts;
    my @et = List::MoreUtils::singleton( @$tags, @tags_all );

    $query->{author} = $query->{primary_post}{user} // $posts[0]{user};

    my $content = themed_render(
        'posts.tx',
        {
            acls              => \@acls,
            can_edit          => $is_admin,
            forms             => $forms,
            post              => { tags => $tags, extra_tags => \@et, form => $edittype, visibility => $user_visibility, addpost => 1 },
            post_visibilities => \@visibuddies,
            failure           => $query->{failure},
            to                => $query->{to},
            message           => $query->{failure} ? "Failed to add post!" : "Successfully added Post as $query->{id}",
            direct            => $direct,
            title             => $query->{title},
            author            => $query->{primary_post}{user} // $posts[0]{user},
            style             => $query->{style},
            posts             => \@posts,
            like              => $query->{like},
            in_series         => exists $query->{in_series} || !!( $query->{route} =~ m/^\/series\// ),
            route             => $query->{route},
            limit             => $limit,
            pages             => scalar(@posts) == $limit,
            older             => $older,
            newer             => $newer,
            sizes             => [ 25, 50, 100 ],
            rss               => !$query->{id} && !$query->{older},
            tiled             => $tiled,
            category          => $ph,
            subhead           => $query->{subhead},
            header            => $header,
            footer            => $footer,
            headers           => $headers,
            footers           => $footers,
            years             => [ reverse( $oldest_year .. $now_year ) ],
            months            => [ 0 .. 11 ],
        }
    );
    return $content if $direct;
    return Trog::Routes::HTML::index( $query, $content, $styles );
}

sub _templates_in_dir ($path) {
    my $forms = [];
    return $forms unless -d $path;
    opendir( my $dh, $path );
    while ( my $form = readdir($dh) ) {
        push( @$forms, $form ) if -f "$path/$form" && $form =~ m/.*\.tx$/;
    }
    close($dh);
    return $forms;
}

sub _themed_title ($path) {
    return $path unless %Theme::paths;
    return $Theme::paths{$path} ? $Theme::paths{$path} : $path;
}

sub _post_helper ( $query, $tags, $acls ) {
    return $data->get(
        older        => $query->{older},
        newer        => $query->{newer},
        page         => int( $query->{page}  || 1 ),
        limit        => int( $query->{limit} || 25 ),
        tags         => $tags,
        exclude_tags => $query->{exclude_tags},
        acls         => $acls,
        aclname      => $query->{aclname},
        like         => $query->{like},
        author       => $query->{author},
        id           => $query->{id},
        version      => $query->{version},
    );
}

=head2 sitemap

Return the sitemap index unless the static or a set of dynamic routes is requested.
We have a maximum of 99,990,000 posts we can make under this model
As we have 10,000 * 10,000 posts which are indexable via the sitemap format.
1 top level index slot (10k posts) is taken by our static routes, the rest will be /posts.

Passing ?xml=1 will result in an appropriate sitemap.xml instead.
This is used to generate the static sitemaps as expected by search engines.

Passing compressed=1 will gzip the output.

=cut

sub sitemap ($query) {

    state $etag = "sitemap-" . time();
    my ( @to_map, $is_index, $route_type );
    my $warning = '';
    $query->{map} //= '';
    if ( $query->{map} eq 'static' ) {

        # Return the map of static routes
        $route_type = 'Static Routes';
        @to_map     = grep { !defined $routes{$_}->{captures} && $_ !~ m/^default|login|auth$/ && !$routes{$_}->{auth} } keys(%routes);
    }
    elsif ( !$query->{map} ) {

        # Return the index instead
        @to_map = ('static');
        my $tot   = $data->count();
        my $size  = 50000;
        my $pages = int( $tot / $size ) + ( ( $tot % $size ) ? 1 : 0 );

        # Truncate pages at 10k due to standard
        my $clamped = $pages > 49999 ? 49999 : $pages;
        $warning = "More posts than possible to represent in sitemaps & index!  Old posts have been truncated." if $pages > 49999;

        foreach my $page ( $clamped .. 1 ) {
            push( @to_map, "$page" );
        }
        $is_index = 1;
    }
    else {
        $route_type = "Posts: Page $query->{map}";

        # Return the map of the particular range of dynamic posts
        $query->{limit} = 50000;
        $query->{page}  = $query->{map};
        @to_map         = _post_helper( $query, [], ['public'] );
    }

    if ( $query->{xml} ) {
        my $sm;
        my $xml_date = time();
        my $fmt      = "xml";
        $fmt .= ".gz" if $query->{compressed};
        if ( !$query->{map} ) {
            require WWW::SitemapIndex::XML;
            $sm = WWW::SitemapIndex::XML->new();
            foreach my $url (@to_map) {
                $sm->add(
                    loc     => "http://$query->{domain}/sitemap/$url.$fmt",
                    lastmod => $xml_date,
                );
            }
        }
        else {
            require WWW::Sitemap::XML;
            $sm = WWW::Sitemap::XML->new();
            my $changefreq = $query->{map} eq 'static' ? 'monthly' : 'daily';
            foreach my $url (@to_map) {
                my $true_uri = "http://$query->{domain}$url";
                if ( ref $url eq 'HASH' ) {
                    my $is_user_page = grep { $_ eq 'about' } @{ $url->{tags} };
                    $true_uri = "http://$query->{domain}/posts/$url->{id}";
                    $true_uri = "http://$query->{domain}/users/$url->{title}" if $is_user_page;
                }
                my %out = (
                    loc        => $true_uri,
                    lastmod    => $xml_date,
                    mobile     => 1,
                    changefreq => $changefreq,
                    priority   => 1.0,
                );

                if ( ref $url eq 'HASH' ) {

                    #add video & preview image if applicable
                    $out{images} = [
                        {
                            loc     => "http://$query->{domain}$url->{href}",
                            caption => $url->{data},
                            title   => substr( $url->{title}, 0, 100 ),
                        }
                      ]
                      if $url->{is_image};

                    # Truncate descriptions
                    my $desc    = substr( $url->{data}, 0, 2048 ) || '';
                    my $href    = $url->{href}                    || '';
                    my $preview = $url->{preview}                 || '';
                    my $domain  = $query->{domain}                || '';
                    $out{videos} = [
                        {
                            content_loc   => "http://$domain$href",
                            thumbnail_loc => "http://$domain$preview",
                            title         => substr( $url->{title}, 0, 100 ) || '',
                            description   => $desc,
                        }
                      ]
                      if $url->{is_video};
                }

                $sm->add(%out);
            }
        }
        my $xml = $sm->as_xml();
        require IO::String;
        my $buf = IO::String->new();
        my $ct  = 'application/xml';
        $xml->toFH( $buf, 0 );
        seek $buf, 0, 0;

        if ( $query->{compressed} ) {
            require IO::Compress::Gzip;
            my $compressed = IO::String->new();
            IO::Compress::Gzip::gzip( $buf => $compressed );
            $ct  = 'application/gzip';
            $buf = $compressed;
            seek $compressed, 0, 0;
        }

        #XXX This is one of the few exceptions where we don't use finish_render, as it *requires* gzip.
        return [ 200, [ "Content-type" => $ct, 'ETag' => $etag ], $buf ];
    }

    @to_map = sort @to_map unless $is_index;
    my $styles = _build_themed_styles('sitemap.css');

    $query->{title} = "$query->{domain} : Sitemap";
    my $content = themed_render(
        'sitemap.tx',
        {
            title      => "Site Map",
            to_map     => \@to_map,
            is_index   => $is_index,
            route_type => $route_type,
            route      => $query->{route},
        }
    );
    $query->{etag} = $etag;

    return Trog::Routes::HTML::index( $query, $content, $styles );
}

sub _rss ( $query, $posts ) {
    require XML::RSS;
    my $rss = XML::RSS->new( version => '2.0', stylesheet => '/styles/rss-style.xsl' );
    my $now = DateTime->from_epoch( epoch => time() );
    $rss->channel(
        title         => "$query->{domain}",
        link          => "http://$query->{domain}/$query->{route}.rss.xml",
        language      => 'en',                                                   #TODO localization
        description   => "$query->{domain} : $query->{route}",
        pubDate       => $now,
        lastBuildDate => $now,
    );

    $rss->image(
        title       => $query->{domain},
        url         => "/favicon.ico",
        link        => "http://$query->{domain}",
        width       => 32,
        height      => 32,
        description => "$query->{domain} favicon",
    );

    foreach my $post (@$posts) {
        my $url = "http://$query->{domain}$post->{local_href}";
        _post2rss( $rss, $url, $post );
        next unless ref $post->{aliases} eq 'ARRAY';
        foreach my $alias ( @{ $post->{aliases} } ) {
            $url = "http://$query->{domain}$alias";
            _post2rss( $rss, $url, $post );
        }
    }

    return finish_render(
        undef,
        {
            etag => $query->{etag},
            contenttype => "application/rss+xml",
            body => encode_utf8( $rss->as_string ),
            scheme => $query->{scheme}
        },
        'Content-Disposition' => 'inline; filename="rss.xml"',
    );
}

sub _post2rss ( $rss, $url, $post ) {
    $rss->add_item(
        title       => $post->{title},
        permaLink   => $url,
        link        => $url,
        enclosure   => { url => $url, type => "text/html" },
        description => "<![CDATA[$post->{data}]]>",
        pubDate     => DateTime->from_epoch( epoch => $post->{created} ),    #TODO format like Thu, 23 Aug 1999 07:00:00 GMT
        author      => $post->{user},                                        #TODO translate to "email (user)" format
    );
}

=head2 manual

Implements the /manual and /lib/* routes.

Basically a thin wrapper around Pod::Html.

=cut

sub manual ($query) {
    return see_also('/login')                    unless $query->{user};
    return Trog::Routes::HTML::forbidden($query) unless grep { $_ eq 'admin' } @{ $query->{user_acls} };

    require Pod::Html;
    require Capture::Tiny;

    #Fix links from Pod::HTML
    $query->{module} =~ s/\.html$//g if $query->{module};

    my $infile = $query->{module} ? "$query->{module}.pm" : 'tCMS/Manual.pod';
    return notfound($query) unless -f "lib/$infile";
    my $content = capture { Pod::Html::pod2html( qw{--podpath=lib --podroot=.}, "--infile=lib/$infile" ) };

    return finish_render(
        'manual.tx',
        {
            title       => 'tCMS Manual',
            theme_dir   => $td,
            content     => $content,
            stylesheets => _build_themed_styles('post.css'),
            scheme      => $query->{scheme},
        }
    );
}

# Deal with Params which may or may not be arrays
sub _coerce_array ($param) {
    my $p = $param || [];
    $p = [$param] if $param && ( ref $param ne 'ARRAY' );
    return $p;
}

sub _build_themed_styles ($style) {
    my @styles;
    @styles = ("/styles/$style") if -f "www/styles/$style";
    my $ts = _themed_style($style);
    push( @styles, $ts ) if $theme_dir && -f "www/$ts";
    return \@styles;
}

sub _build_themed_scripts ($script) {
    my @scripts = ("/scripts/$script");
    my $ts      = _themed_script($script);
    push( @scripts, $ts ) if $theme_dir && -f "www/$ts";
    return \@scripts;
}

sub _build_themed_templates ($template) {
    my @templates = ("/templates/$template");
    my $ts        = _themed_template($template);
    push( @templates, $ts ) if $theme_dir && -f "www/$ts";
    return \@templates;
}

sub themed_render ( $template, $data ) {
    state $child_processor = Text::Xslate->new(

        # Prevent a recursive descent.  If the renderer is hit again, just do nothing
        # XXX unfortunately if the post tries to include itself, it will die.
        function => {
            embed => sub {
                my ( $this_id, $style ) = @_;
                $style //= 'embed';

                # If instead the style is 'content', then we will only show the content w/ no formatting, and no title.
                return Text::Xslate::mark_raw(
                    Trog::Routes::HTML::posts(
                        { route => "/post/$this_id", style => $style },
                        sub { },
                        1
                    )
                );
            },
        }
    );
    state $child_renderer = sub {
        my ( $template_string, $options ) = @_;

        # If it fails to render, it must be something else
        my $out = eval { $child_processor->render_string( $template_string, $options ) };
        return $out ? $out : $template_string;
    };

    state $processor = Text::Xslate->new(
        path     => $template_dir,
        function => {
            render_it => $child_renderer,
        },
    );

    state $t_processor = $theme_dir
      ? Text::Xslate->new(
        path     => "www/$theme_dir/templates",
        function => {
            render_it => $child_renderer,
        },
      )
      : undef;

    return _pick_processor( "templates/$template", $processor, $t_processor )->render( $template, $data );
}

sub _pick_processor ( $file, $normal, $themed ) {
    return _dir_for_resource($file) eq $template_dir ? $normal : $themed;
}

# Pick appropriate dir based on whether theme override exists
sub _dir_for_resource ($resource) {
    return $theme_dir && -f "www/$theme_dir/$resource" ? $theme_dir : $template_dir;
}

sub _themed_style ($resource) {
    return _dir_for_resource("styles/$resource") . "/styles/$resource";
}

sub _themed_script ($resource) {
    return _dir_for_resource("scripts/$resource") . "/scripts/$resource";
}

sub _themed_template ($resource) {
    return _dir_for_resource("templates/$resource") . "/templates/$resource";
}

sub finish_render ( $template, $vars, %headers ) {

    #XXX default vars that need to be pulled from config
    $vars->{lang}        //= 'en-US';
    $vars->{title}       //= 'tCMS';
    $vars->{stylesheets} //= [];
    $vars->{scripts}     //= [];

    # Absolute-ize the paths for scripts & stylesheets
    @{ $vars->{stylesheets} } = map { CORE::index( $_, '/' ) == 0 ? $_ : "/$_" } @{ $vars->{stylesheets} };
    @{ $vars->{scripts} }     = map { CORE::index( $_, '/' ) == 0 ? $_ : "/$_" } @{ $vars->{scripts} };

    # TODO Smash together the stylesheets and minify

    $vars->{contenttype}  //= $Trog::Vars::content_types{html};
    $vars->{cachecontrol} //= $Trog::Vars::cache_control{revalidate};

    $vars->{code} ||= 200;

    my $body = exists $vars->{body} ? $vars->{body} : '';
    if ($template) {
        $body = themed_render( 'header.tx', $vars );
        $body .= themed_render( $template,   $vars );
        $body .= themed_render( 'footer.tx', $vars );
        $body = encode_utf8($body);
    }

    #Disallow framing UNLESS we are in embed mode
    $headers{"Content-Security-Policy"} = qq{frame-ancestors 'none'} unless $vars->{embed};

    my $ct = 'Content-type';
    my $cc = 'Cache-control';
    $headers{$ct}              = $vars->{contenttype} // "text/html";
    $headers{$cc}              = $vars->{cachecontrol} if $vars->{cachecontrol};
    $headers{'Vary'}           = 'Accept-Encoding';
    $headers{"Content-Length"} = length($body);
    $headers{'X-Content-Type-Options'} = 'nosniff';
    $headers{'X-Frame-Options'} = 'DENY' unless $vars->{embed};
    $headers{'Referrer-Policy'} = 'no-referrer-when-downgrade';

    #CSP. Yet another layer of 'no mixed content' plus whitelisted execution of remote resources.
    my $scheme = $vars->{scheme} ? $vars->{scheme} : '';
    my $sites = $conf->param('security.allow_embeds_from') // '';
    $headers{'Content-Security-Policy'} .= ";default-src '$scheme' 'self' 'unsafe-eval' 'unsafe-inline' $sites";
    $headers{'Content-Security-Policy'} .= ";object-src 'none'";

    # Force https if we are https
    $headers{'Strict-Transport-Security'} = 'max-age=63072000';

    # We only set etags when users are logged in, cause we don't use statics
    $headers{'ETag'} = $vars->{etag} if $vars->{etag} && $vars->{user};

    my $skip_render = !$vars->{route} || $vars->{has_query};

    # Time to stash (and cache!) the bodies for public routes, everything else should be fine
    save_render( $vars, $body, %headers ) unless $vars->{user} || $skip_render;

    #Return data in the event the caller does not support deflate
    return [ $vars->{code}, [%headers], [$body] ] unless $vars->{deflate};

    #Compress
    $headers{"Content-Encoding"} = "gzip";
    my $dfh;
    IO::Compress::Gzip::gzip( \$body => \$dfh );
    print $IO::Compress::Gzip::GzipError if $IO::Compress::Gzip::GzipError;
    $headers{"Content-Length"} = length($dfh);

    save_render( { route => "$vars->{route}.z", code => $vars->{code} }, $dfh, %headers ) unless $vars->{user} || $skip_render;

    return [ $vars->{code}, [%headers], [$dfh] ];
}

sub save_render ( $vars, $body, %headers ) {
    Path::Tiny::path( "www/statics/" . dirname( $vars->{route} ) )->mkpath;
    my $file = "www/statics/$vars->{route}";

    my $verb = -f $file ? 'Overwrite' : 'Write';
    DEBUG("$verb static for $vars->{route}");
    open( my $fh, '>', $file ) or die "Could not open $file for writing";
    print $fh "HTTP/1.1 $vars->{code} OK\n";
    foreach my $h ( keys(%headers) ) {
        print $fh "$h:$headers{$h}\n" if $headers{$h};
    }
    print $fh "\n";
    print $fh $body;
    close $fh;
}

# basically a file rewrite rule for themes
sub icon ($query) {
    my $path = $query->{route};
    return Trog::FileHandler::serve("$td/img/icon/$path");
}

# TODO make statics, abstract gzipped outputting & header handling
sub rss_style ($query) {
    my $body = encode_utf8(themed_render('rss-style.tx', $query));
    my %headers = (
        'Content-Type'   => 'text/xsl',
        'Content-Length' => length($body),
        'Cache-Control'  => $Trog::Vars::cache_control{revalidate},
        'X-Content-Type-Options' => 'nosniff',
        'Vary'           => 'Accept-Encoding',
    );
    return [ 200, [%headers], [$body]] unless $query->{deflate};

    $headers{"Content-Encoding"} = "gzip";
    my $dfh;
    IO::Compress::Gzip::gzip( \$body => \$dfh );
    print $IO::Compress::Gzip::GzipError if $IO::Compress::Gzip::GzipError;
    $headers{"Content-Length"} = length($dfh);

    return [ 200, [%headers], [$dfh] ];
}

1;