#!/usr/bin/perl
# This file is part of sakisafe.

use if $^O eq "openbsd", OpenBSD::Pledge, qw(pledge);
use Mojolicious::Lite -signatures;
use Mojolicious::Routes::Pattern;
use Mojo::Log;
use Time::HiRes;
use List::MoreUtils qw(uniq);
use Term::ANSIColor;
use English;
use MIME::Types;
use Path::Tiny;
use warnings;
use experimental 'signatures';
use feature 'say';
plugin 'RenderFile';

# OpenBSD promises.
pledge("stdio cpath rpath wpath inet flock fattr") if $^O eq "openbsd";

# 100 MBs
my $MAX_SIZE = 1024 * 1024 * 100;

my @BANNED = eval { path('banned.txt')->slurp_utf8 } || qw(); # Add banned IP addresses here
my $dirname;
my $link;

mkdir "f";

# Mojo logger
my $log = Mojo::Log->new(path => 'sakisafe.log', level => 'trace');
$log->color(1);

# Forward logs to STDERR or STDOUT while also writing to the `sakisafe.log` file.
$log->on(message => sub ($l, $level, @lines) {
    my $time = time;
    my ($s, $m, $h, $day, $month, $year) = localtime time;
    $time = sprintf('%04d-%02d-%02d %02d:%02d:%08.5f', $year + 1900, $month + 1, $day, $h, $m,
                    "$s." . ((split '.', $time)[1] // 0));
    my $log_to_print = '[' . $time . '] ' . '[' . $level . '] ' . join(' ', @lines);
    if ($level eq 'trace' || $level eq 'info') {
        say $log_to_print;
    } else {
        print \*STDERR, $log_to_print . "\n";
    }
});

# Function to handle file uploads
sub handle_file {
    my $c        = shift;
	my $filedata = $c->param("file");
	if ( $filedata->size > $MAX_SIZE ) {
		return $c->render(
					   text   => "Max upload size: $MAX_SIZE",
					   status => 400
					  );
	}
    
	if ( List::MoreUtils::any { $c->tx->remote_address } uniq @BANNED ) {
        $log->info("Attempt to upload by banned IP: " . $c->tx->remote_address);
		$c->render(
				 text =>
				 "Hi! Seems like the server admin added your IP address to the banned IP array."
				 . "As the developer of sakisafe, I can't do anything.",
				 status => 403
				);
		return;
	}

	# Generate random string for the directory
	my @chars = ( '0' .. '9', 'a' .. 'Z' );
	$dirname .= $chars[ rand @chars ] for 1 .. 5;
	my $filename = $filedata->filename;
	$log->warn("sakisafe warning: could not create directory: $ERRNO")
	  unless mkdir( "f/" . $dirname );
	$filename .= ".txt" if $filename eq "-";
    
	# TODO: get whether the server is http or https
	# There's a CGI ENV variable for that.
	my $host = $c->req->url->to_abs->host;
    my $ua = $c->req->headers->user_agent;
	$filedata->move_to( "f/" . $dirname . "/" . $filename );
	$link = "http://$host/f/$dirname/$filename";
	$c->stash(link => $link, host => $host, dirname => $dirname);
    
	$c->res->headers->header(
						'Location' => "$link" . $filename );

	# Only give the link to curl, html template for others.
	if($ua =~ m/curl/) {
		$c->render(
				 text => $link . "\n",
				 status => 201,
				);

		$dirname = "";
	} else {
		$c->render(
				 template => 'file',
				 status => 201,
				);
    }
    
	$log->info($c->tx->remote_address . " " . $dirname . "/" . $filename );
	$dirname = "";
}

# Function to log uploaded files

get '/' => 'index';
post '/' => sub ($c) { handle_file($c) };

# Allow files to be downloaded.

get '/f/:dir/#name' => sub ($c) {
	my $dir  = $c->param("dir");
	my $file = $c->param("name");
	my $ext  = $file;
	$ext =~ s/.*\.//;
	my $path = "f/" . $dir . "/" . $file;

	#carp "sakisafe warning: could not get file: $ERRNO" unless
	$c->render( text => "file not found", status => 404 ) unless -e $path;
	$c->render_file(
				 filepath            => $path,
				 format              => $ext,
				 content_disposition => 'inline'
				);
};

app->log($log);
app->max_request_size( 1024 * 1024 * 100 );

post '/upload' => sub ($c) { handle_file($c) };

app->start;

# Index template

# By default Mojolicious gets the "directory root" from the "public"
# directory, so the css and the favicon from the "public" directory,
# in the root of this repo.

# Not sure why I have to do this filthy hack, could not get Mojolicious
# to get the template here. So a TODO is to fix this.

__DATA__
@@ file.html.ep
  <!DOCTYPE html>
  <html lang="en">
  <head>
  <title>sakisafe</title>
  <link rel="stylesheet" type="text/css" href="index.css"/>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
  <center>
  <h1>sakisafe</h1>
  <h2>shitless file upload, pastebin and url shorter</h2>
  <img src="saki.png"/>
  <h2>LINK</h2>
  <code><%= $link %></code>
  </center>
  <p>Running sakisafe 2.4.0</p>
  </body>
  </html>

@@ index.html.ep
  <!DOCTYPE html>
  <html lang="en">
  <head>
  <title>sakisafe</title>
  <link rel="stylesheet" type="text/css" href="index.css"/>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
  <center>
  <h1>sakisafe</h1>
  <h2>shitless file upload, pastebin and url shorter</h2>
  <img src="saki.png"/>
  <h2>USAGE</h2>
  <p>POST a file:</p>
  <code>curl -F 'file=@yourfile.png' https://<%= $c->req->url->to_abs->host; %></code>
  <p>Post your text directly</p>
  <code>curl -F 'file=@-' https://<%= $c->req->url->to_abs->host; %></code>
  </center>
  <p>Running sakisafe 2.4.0</p>
  <div class="left">
  <h2>Or just upload a file here</h2>
  <form ENCTYPE='multipart/form-data' method='post' action='/upload'>
  <input type='file' name='file' size='30' required/>
  <input type='submit' value='upload'/>
  </form>
  </div>
  </body>
  </html>
__END__

=pod

=head1 sakisafe

sakisafe is a web application using the Mojolicious framework which
allow users to simply upload and share files.

=head2 synopsis

C<./sakisafe.pl daemon -m production>

This will start sakisafe in port 3000. Which should be proxied with
nginx or any reverse proxy software.

=head2 license

The Unlicense.

=head2 author

Raoul Vaughn

=cut