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#!/usr/bin/env perl
#
# Author: Guillermo Ramos <gramos@gramos.me> (2019)
#
# Run `tgsend -h` for quick help, or `tgsend -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>;
my $TOKEN;
my $PRETEND;
my $VERBOSE = 0;
my $HELP;
GetOptions("token=s" => \$TOKEN,
"pretend" => \$PRETEND,
"verbose+" => \$VERBOSE,
"help" => \$HELP);
pod2usage(-verbose => $VERBOSE+1) if $HELP or ! @ARGV;
# If token was not specified in CLI, try to get it from ENV
$TOKEN ||= $ENV{'TGSEND_TOKEN'};
# If still no token, try to get it from ~/.config/tgsend_token
unless ($TOKEN) {
my $CONFIG_HOME = $ENV{'XDG_CONFIG_HOME'} || $ENV{'HOME'} . "/.config";
my $CONFIG = "$CONFIG_HOME/tgsend_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)";
# Read text from stdin
undef $/;
my $TEXT = <STDIN>;
my $ua = LWP::UserAgent->new;
my $URI = "https://api.telegram.org/bot$TOKEN/sendMessage";
sub send_message {
my $chat_id = shift;
my $content = encode_json {'chat_id' => $chat_id, 'text' => $TEXT};
my $req = HTTP::Request->new("POST", $URI,
["Content-Type", "application/json"], $content);
if ($VERBOSE || $PRETEND) {
print "Sending to $chat_id:\n====\n$TEXT\n====\n";
print "Request:\n", Dumper($req) if $VERBOSE > 1;
}
unless ($PRETEND) {
my $resp = $ua->request($req);
print "Response:\n", Dumper($resp) if $VERBOSE > 1;
if ($resp->is_error()) {
die $resp->message;
}
}
}
send_message($_) foreach @ARGV;
__END__
=head1 NAME
tgsend - Send message to a Telegram chat using a bot token
=head1 SYNOPSIS
tgsend [-h | --help]
tgsend [options] [chatid1 chatid2 ...]
=head1 OPTIONS
--token | -t Bot token (see AUTHENTICATION)
--pretend | -p Do not actually do anything
--version Show version
--verbose | -v Show more information (combine with -h to see full manual)
--help | -h Show this message
=head1 DESCRIPTION
This program sends its standard input to the Telegram chats whose IDs are passed
as arguments, using the given bot token.
=head1 AUTHENTICATION
To get the bot token, this program will check (in order):
- The "--token" CLI argument
- The "TGSEND_TOKEN" environment variable
- The contents of "$XDG_CONFIG_HOME/tgsend_token"
(usually ~/.config/tgsend_token)
=cut
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