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/var/www/vhosts/3dshawn.com/shop.3dshawn.com/support_meta_send.cgi

added on local at 2026-07-10 00:38:39

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	1	#!/usr/bin/perl
	2	#======================================================================
	3	# Cross-site support reply endpoint. Accepts a signed JSON POST from
	4	# Meta-Admin's operator console and delegates to this site's normal
	5	# MODS::ShopCart::Support::send_message so all the usual bookkeeping
	6	# (unread flags, status flip, last_message_at) fires.
	7	#
	8	# Wire-format:
	9	# POST /support_meta_send.cgi
	10	# Content-Type: application/json
	11	# Body: {"ts": 1720000000, "thread_id": 42, "body": "hello"}
	12	# Header: X-Meta-Sig: sha256_hex_hmac(secret, "$ts.$thread_id.$body_sha256")
	13	#
	14	# Shared secret:
	15	# platform_settings.meta_admin_hmac_secret (mirror on Meta-Admin).
	16	# 5-minute clock skew tolerance. Constant-time signature compare.
	17	#======================================================================
	18	use strict;
	19	use warnings;
	20
	21	my $raw = '';
	22	if (($ENV{REQUEST_METHOD} \|\| '') eq 'POST') {
	23	my $len = $ENV{CONTENT_LENGTH} \|\| 0;
	24	read STDIN, $raw, $len if $len > 0 && $len < 65536;
	25	}
	26
	27	use lib '/var/www/vhosts/3dshawn.com/shop.3dshawn.com';
	28	use CGI ();
	29	use JSON::PP ();
	30	use Digest::SHA qw(hmac_sha256_hex sha256_hex);
	31	use MODS::DBConnect;
	32	use MODS::ShopCart::Config;
	33	use MODS::ShopCart::Support;
	34
	35	sub _json_out {
	36	my ($code, $body) = @_;
	37	my $status_line = $code == 200 ? '' : "Status: $code\n";
	38	print "${status_line}Content-Type: application/json\n\n";
	39	print JSON::PP::encode_json($body);
	40	exit;
	41	}
	42
	43	_json_out(405, { error => 'method_not_allowed' })
	44	unless ($ENV{REQUEST_METHOD} \|\| '') eq 'POST';
	45	_json_out(400, { error => 'empty_body' }) unless length $raw;
	46
	47	my $sig_hdr = $ENV{HTTP_X_META_SIG} \|\| '';
	48	$sig_hdr =~ s/[^a-f0-9]//gi;
	49	_json_out(400, { error => 'no_signature' }) unless length($sig_hdr) == 64;
	50
	51	my $data = eval { JSON::PP::decode_json($raw) };
	52	_json_out(400, { error => 'bad_json' }) unless $data && ref($data) eq 'HASH';
	53
	54	my $ts = int($data->{ts} \|\| 0);
	55	my $thread_id = int($data->{thread_id} \|\| 0);
	56	my $body_txt = defined($data->{body}) ? $data->{body} : '';
	57
	58	_json_out(400, { error => 'missing_thread_id' }) unless $thread_id > 0;
	59	_json_out(400, { error => 'empty_body' }) unless length $body_txt;
	60	_json_out(400, { error => 'stale_timestamp' }) if abs(time - $ts) > 300;
	61
	62	my $cfg = MODS::ShopCart::Config->new;
	63	my $secret = $cfg->settings('meta_admin_hmac_secret') \|\| '';
	64	_json_out(500, { error => 'no_secret_configured' }) unless length($secret) >= 32;
	65
	66	my $body_hash = sha256_hex($body_txt);
	67	my $expected = hmac_sha256_hex("$ts.$thread_id.$body_hash", $secret);
	68
	69	# Constant-time compare
	70	my $ok = length($sig_hdr) == length($expected);
	71	my $r = 0;
	72	if ($ok) {
	73	for (my $i = 0; $i < length($sig_hdr); $i++) {
	74	$r \|= ord(substr($sig_hdr, $i, 1)) ^ ord(substr($expected, $i, 1));
	75	}
	76	$ok = ($r == 0);
	77	}
	78	_json_out(403, { error => 'bad_signature' }) unless $ok;
	79
	80	# Signature valid -- dispatch to site's Support.pm.
	81	my $db = MODS::DBConnect->new;
	82	my $dbh = $db->db_connect();
	83	my $DB = $cfg->settings('database_name');
	84	my $sup = MODS::ShopCart::Support->new;
	85
	86	my $mid = $sup->send_message($db, $dbh, $DB, {
	87	thread_id => $thread_id,
	88	sender_role => 'admin',
	89	sender_user_id => 0, # NULL in DB -- portfolio-level operator, no local user row
	90	body => $body_txt,
	91	});
	92
	93	$db->db_disconnect($dbh);
	94
	95	_json_out(200, { ok => 1, message_id => ($mid \|\| 0) });