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#!/usr/bin/env perl
#
# Author: Guillermo Ramos <gramos@gramos.me> (2019)
#
# Dependencies: Try-Tiny, HTTP-Message, libwww-perl
#
# Run `tgserver -h` for quick help, or `tgserver -h -v` for full manual.
################################################################################
use strict;
use warnings;
use Try::Tiny;
$main::VERSION = "0.1.1";
use Getopt::Long qw(:config auto_version);
use Pod::Usage qw<pod2usage>;
use Data::Dumper;
use MIME::Base64 qw<decode_base64>;
use JSON qw<decode_json>;
use FindBin;
use lib "$FindBin::Bin/lib";
use TgLib qw<fetch_token>;
require TgLib::Api;
require TgLib::Cache;
require TgLib::Logger;
my $TOKEN;
my $VERBOSE = 0;
my $HELP;
GetOptions("token=s" => \$TOKEN,
"verbose+" => \$VERBOSE,
"help" => \$HELP);
pod2usage(-verbose => $VERBOSE+1) if $HELP or not @ARGV;
my $logger = TgLib::Logger->new($VERBOSE);
# If token was not specified in CLI, get it from ENV/file
$TOKEN ||= fetch_token() or
pod2usage(-message => "ERROR: Unable to get bot token ($!).\n",
-verbose => 99, -sections => "AUTHENTICATION");
my $cache = TgLib::Cache->new($logger);
my $api = TgLib::Api->new($TOKEN, $logger);
my $sleep_exp = 1;
while (1) {
# FIXME magic timeout
my @updates = eval { @{$api->get_updates(3600, $cache->offset)} };
if ($@) {
chomp $@;
print "ERROR: $@\n";
sleep($sleep_exp);
$sleep_exp *= 2 unless $sleep_exp >= 32;
} else {
$sleep_exp = 1;
};
foreach my $update (@updates) {
# Cache current offset
$cache->offset($update->{'update_id'}+1);
$logger->debug(sprintf "Update %s", Dumper($update));
if ($update->{'message'}) {
my $msg = $update->{'message'};
$ENV{'TGUTILS_CHAT_ID'} = $msg->{'chat'}{'id'};
$ENV{'TGUTILS_FROM_ID'} = $msg->{'from'}{'id'};
$ENV{'TGUTILS_FROM_USERNAME'} = $msg->{'from'}{'username'};
if (exists $msg->{'photo'}) {
handle_photo($msg);
} else {
handle_text($msg);
}
} elsif ($update->{'edited_message'}) {
my $msg = $update->{'edited_message'};
# TODO
$logger->info("Received edited message, ignoring...");
} else {
$logger->warn("Received unknown update type (ignoring): $update\n");
}
}
}
sub handle_photo {
my $msg = shift;
my $photos = $msg->{'photo'};
my $chat_id = $msg->{'chat'}{'id'};
my $photo = (sort { $b->{'width'} <=> $a->{'width'} } @$photos)[0];
$logger->info(sprintf "%s: [Photo %s (size=%d)] -> 🤖\n",
$chat_id, $photo->{'file_id'}, $photo->{'file_size'});
my $file = $api->get_file($photo->{'file_id'});
$ENV{'TGUTILS_TYPE'} = 'IMAGE';
my $response = pipe_send($file, @ARGV);
reply($chat_id, $response);
}
sub handle_text {
my $msg = shift;
my $text = $msg->{'text'};
my $chat_id = $msg->{'chat'}{'id'};
$logger->info("$chat_id: '$text' -> 🤖\n");
$ENV{'TGUTILS_TYPE'} = 'TEXT';
my $response = pipe_send($text, @ARGV);
reply($chat_id, $response);
}
sub reply {
my $chat_id = shift;
my $response = shift;
my $type = ref $response eq 'HASH' ? $response->{'type'} : 'TEXT';
if ($type eq 'DOCUMENT') {
my $caption = $response->{'caption'};
$logger->info("🤖: [Document '$caption'] -> $chat_id\n");
$api->send_document($chat_id, decode_base64 $response->{'content'},
$response->{'filename'}, $caption);
} elsif ($type eq 'PHOTO') {
my $caption = $response->{'caption'};
$logger->info("🤖: [Photo '$caption'] -> $chat_id\n");
$api->send_photo($chat_id, decode_base64 $response->{'content'},
$response->{'filename'}, $caption);
} elsif ($type eq 'TEXT' and $response) {
$logger->info("🤖: '$response' -> $chat_id\n");
$api->send_message($chat_id, $response);
} else {
$logger->debug("Empty response, skipping\n");
}
}
sub pipe_send {
my ($content, @cmd) = @_;
$SIG{PIPE} = sub {
$logger->debug("SIGPIPE received (@_), ignoring\n");
};
use IPC::Open2 qw<open2>;
my $pid = open2(my $progr, my $progw, @cmd);
print $progw $content;
close($progw);
# Don't read a single line
my $oldsep = $/;
$/ = undef;
binmode($progr);
my $response = <$progr>;
close($progr);
$/ = $oldsep;
waitpid $pid, 0; # collect the child process
chomp $response;
return try { decode_json $response } catch { $response };
}
__END__
=head1 NAME
tgserver - Interact with a Telegram Bot
=head1 SYNOPSIS
B<tgserver> [B<-h> | B<--help>] [B<-v>]
B<tgserver> [I<options>] -- I<prog>
=head1 OPTIONS
=over
=item B<--token>=I<token>, B<-t> I<token>
Bot token (see B<AUTHENTICATION>)
=item B<--version>
Show version
=item B<--verbose>, B<-v>
Show more information (combine with B<-h> to see full manual)
=item B<--help>, B<-h>
Show this message
=back
=head1 DESCRIPTION
This program waits for Telegram updates from the bot identified by I<token>. For
every update it runs I<prog> with stdin piped to the update, and sending stdout
back as response.
=head1 EXAMPLE
tgserver --token 123456789:abcdefghijklmnopqrstuvwxyzABCDEFGHI -- \
cowsay -f moofasa
=head1 AUTHENTICATION
To get the bot token, this program will check (in order):
=over 2
=item -
The B<--token> CLI argument
=item -
The B<TGUTILS_TOKEN> environment variable
=item -
The contents of I<$XDG_CONFIG_HOME>B</tgutils_token> (usually B<~/.config/tgutils_token>)
=back
=cut
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