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#!/usr/bin/env perl
#
# Author: Guillermo Ramos <gramos@gramos.me> (2019)
#
# Run `tgrecv -h` for quick help, or `tgrecv -h -v` for full manual.
#
# Dependencies: HTTP-Message, JSON
################################################################################
$main::VERSION = "0.1.0";
use Getopt::Long qw(:config auto_version);
use Pod::Usage qw<pod2usage>;
use LWP::UserAgent;
use Data::Dumper;
use HTTP::Request;
use JSON qw<encode_json decode_json>;
my $TOKEN;
my $OUTPUT;
my $OFFSET;
my $TIMEOUT = 60;
my $VERBOSE = 0;
my $HELP;
GetOptions("token=s" => \$TOKEN,
"offset=i" => \$OFFSET,
"timeout=i" => \$TIMEOUT,
"output=s" => \$OUTPUT,
"verbose+" => \$VERBOSE,
"help" => \$HELP);
pod2usage(-verbose => $VERBOSE+1) if $HELP;
# If token was not specified in CLI, try to get it from ENV
$TOKEN ||= $ENV{'TGRECV_TOKEN'};
# If still no token, try to get it from ~/.config/tgrecv_token
unless ($TOKEN) {
my $CONFIG_HOME = $ENV{'XDG_CONFIG_HOME'} || $ENV{'HOME'} . "/.config";
my $CONFIG = "$CONFIG_HOME/tgrecv_token";
open(my $cfg, "<", $CONFIG) or
pod2usage(-message => "ERROR: Unable to get bot token ($CONFIG: $!).\n",
-verbose => 99, -sections => "AUTHENTICATION");
$TOKEN = <$cfg>;
chomp $TOKEN;
close $cfg;
}
# Sanity check
$TOKEN =~ /^[0-9]+:[a-zA-Z0-9]+$/ or die "Invalid bot token ($TOKEN)";
my $ua = LWP::UserAgent->new;
my $uri = "https://api.telegram.org/bot$TOKEN/getUpdates?timeout=$TIMEOUT";
$uri = $uri . "&offset=$OFFSET" if $OFFSET;
my $req = HTTP::Request->new("GET", $uri);
if ($VERBOSE) {
print "Request:\n", Dumper($req) if $VERBOSE > 1;
}
my $resp = $ua->request($req);
print "Response:\n", Dumper($resp) if $VERBOSE > 1;
if ($resp->is_error()) {
die $resp->message;
} else {
my $out = STDOUT;
if ($OUTPUT) {
open($out, ">", $OUTPUT) or die "Cannot open $OUTPUT for writing: $!";
}
print $out encode_json(decode_json($resp->content)->{'result'});
}
__END__
=head1 NAME
tgrecv - Receive updates from Telegram, output them as JSON
=head1 SYNOPSIS
tgrecv [-h | --help]
tgrecv [options]
=head1 OPTIONS
--token | -t Bot token (see AUTHENTICATION)
--offset Offset of the first message to receive - previous ones are
discarded
--timeout Timeout for long polling (default: 60 seconds)
--output=file Write the output to file instead of stdout
--version Show version
--verbose | -v Show more information (combine with -h to see full manual)
--help | -h Show this message
=head1 DESCRIPTION
This program receives a single update batch from the Telegram bot identified by
B<token>, and outputs it as a JSON array. The array can contain multiple
updates. The connection is blocking (long polling), so it waits until an update
is available before exiting.
=head1 AUTHENTICATION
To get the bot token, this program will check (in order):
- The "--token" CLI argument
- The "TGRECV_TOKEN" environment variable
- The contents of "$XDG_CONFIG_HOME/tgrecv_token"
(usually ~/.config/tgrecv_token)
=cut
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