<commit_before><?php

/**
 * @file mod/dfrn_notify.php
 * @brief The dfrn notify endpoint
 * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
 */
require_once('include/items.php');
require_once('include/dfrn.php');
require_once('include/event.php');

require_once('library/defuse/php-encryption-1.2.1/Crypto.php');

function dfrn_notify_post(App $a) {
	logger(__function__, LOGGER_TRACE);
	$dfrn_id      = ((x($_POST,'dfrn_id'))      ? notags(trim($_POST['dfrn_id']))   : '');
	$dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version']    : 2.0);
	$challenge    = ((x($_POST,'challenge'))    ? notags(trim($_POST['challenge'])) : '');
	$data         = ((x($_POST,'data'))         ? $_POST['data']                    : '');
	$key          = ((x($_POST,'key'))          ? $_POST['key']                     : '');
	$rino_remote  = ((x($_POST,'rino'))         ? intval($_POST['rino'])            :  0);
	$dissolve     = ((x($_POST,'dissolve'))     ? intval($_POST['dissolve'])        :  0);
	$perm         = ((x($_POST,'perm'))         ? notags(trim($_POST['perm']))      : 'r');
	$ssl_policy   = ((x($_POST,'ssl_policy'))   ? notags(trim($_POST['ssl_policy'])): 'none');
	$page         = ((x($_POST,'page'))         ? intval($_POST['page'])            :  0);

	$forum = (($page == 1) ? 1 : 0);
	$prv   = (($page == 2) ? 1 : 0);

	$writable = (-1);
	if($dfrn_version >= 2.21) {
		$writable = (($perm === 'rw') ? 1 : 0);
	}

	$direction = (-1);
	if(strpos($dfrn_id,':') == 1) {
		$direction = intval(substr($dfrn_id,0,1));
		$dfrn_id = substr($dfrn_id,2);
	}

	$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
		dbesc($dfrn_id),
		dbesc($challenge)
	);
	if (! dbm::is_result($r)) {
		logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
		xml_status(3);
	}

	$r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
		dbesc($dfrn_id),
		dbesc($challenge)
	);

	// find the local user who owns this relationship.

	$sql_extra = '';
	switch($direction) {
		case (-1):
			$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
			break;
		case 0:
			$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
			break;
		case 1:
			$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
			break;
		default:
			xml_status(3);
			break; // NOTREACHED
	}

	// be careful - $importer will contain both the contact information for the contact
	// sending us the post, and also the user information for the person receiving it.
	// since they are mixed together, it is easy to get them confused.

	$r = q("SELECT	`contact`.*, `contact`.`uid` AS `importer_uid`,
					`contact`.`pubkey` AS `cpubkey`,
					`contact`.`prvkey` AS `cprvkey`,
					`contact`.`thumb` AS `thumb`,
					`contact`.`url` as `url`,
					`contact`.`name` as `senderName`,
					`user`.*
			FROM `contact`
			LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
			WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
				AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
		dbesc($a->argv[1])
	);

	if (! dbm::is_result($r)) {
		logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
		xml_status(3);
		//NOTREACHED
	}

	// $importer in this case contains the contact record for the remote contact joined with the user record of our user.

	$importer = $r[0];

	logger("Remote rino version: ".$rino_remote." for ".$importer["url"], LOGGER_DEBUG);

	if((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
		q("UPDATE `contact` SET `writable` = %d, forum = %d, prv = %d WHERE `id` = %d",
			intval(($writable == (-1)) ? $importer['writable'] : $writable),
			intval($forum),
			intval($prv),
			intval($importer['id'])
		);
		if($writable != (-1))
			$importer['writable'] = $writable;
		$importer['forum'] = $page;
	}


	// if contact's ssl policy changed, update our links

	fix_contact_ssl_policy($importer,$ssl_policy);

	logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
	logger('dfrn_notify: data: ' . $data, LOGGER_DATA);

	if($dissolve == 1) {

		/*
		 * Relationship is dissolved permanently
		 */

		require_once('include/Contact.php');
		contact_remove($importer['id']);
		logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
		xml_status(0);

	}


	// If we are setup as a soapbox we aren't accepting input from this person
	// This behaviour is deactivated since it really doesn't make sense to even disallow comments
	// The check if someone is a friend or simply a follower is done in a later place so it needn't to be done here
	//if($importer['page-flags'] == PAGE_SOAPBOX)
	//	xml_status(0);

	$rino = get_config('system','rino_encrypt');
	$rino = intval($rino);
	// use RINO1 if mcrypt isn't installed and RINO2 was selected
	if ($rino == 2 and !function_exists('mcrypt_create_iv')) $rino=1;

	logger("Local rino version: ". $rino, LOGGER_DEBUG);

	if(strlen($key)) {

		// if local rino is lower than remote rino, abort: should not happen!
		// but only for $remote_rino > 1, because old code did't send rino version
		if ($rino_remote_version > 1 && $rino < $rino_remote) {
			logger("rino version '$rino_remote' is lower than supported '$rino'");
			xml_status(0,"rino version '$rino_remote' is lower than supported '$rino'");
		}

		$rawkey = hex2bin(trim($key));
		logger('rino: md5 raw key: ' . md5($rawkey));
		$final_key = '';

		if($dfrn_version >= 2.1) {
			if((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
				openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
			}
			else {
				openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
			}
		}
		else {
			if((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
				openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);<commit_msg>Opps, became lazy here, thanks to @Hypolite finding it.<commit_after><?php

/**
 * @file mod/dfrn_notify.php
 * @brief The dfrn notify endpoint
 * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
 */
require_once('include/items.php');
require_once('include/dfrn.php');
require_once('include/event.php');

require_once('library/defuse/php-encryption-1.2.1/Crypto.php');

function dfrn_notify_post(App $a) {
	logger(__function__, LOGGER_TRACE);
	$dfrn_id      = ((x($_POST,'dfrn_id'))      ? notags(trim($_POST['dfrn_id']))   : '');
	$dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version']    : 2.0);
	$challenge    = ((x($_POST,'challenge'))    ? notags(trim($_POST['challenge'])) : '');
	$data         = ((x($_POST,'data'))         ? $_POST['data']                    : '');
	$key          = ((x($_POST,'key'))          ? $_POST['key']                     : '');
	$rino_remote  = ((x($_POST,'rino'))         ? intval($_POST['rino'])            :  0);
	$dissolve     = ((x($_POST,'dissolve'))     ? intval($_POST['dissolve'])        :  0);
	$perm         = ((x($_POST,'perm'))         ? notags(trim($_POST['perm']))      : 'r');
	$ssl_policy   = ((x($_POST,'ssl_policy'))   ? notags(trim($_POST['ssl_policy'])): 'none');
	$page         = ((x($_POST,'page'))         ? intval($_POST['page'])            :  0);

	$forum = (($page == 1) ? 1 : 0);
	$prv   = (($page == 2) ? 1 : 0);

	$writable = (-1);
	if($dfrn_version >= 2.21) {
		$writable = (($perm === 'rw') ? 1 : 0);
	}

	$direction = (-1);
	if(strpos($dfrn_id,':') == 1) {
		$direction = intval(substr($dfrn_id,0,1));
		$dfrn_id = substr($dfrn_id,2);
	}

	$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
		dbesc($dfrn_id),
		dbesc($challenge)
	);
	if (! dbm::is_result($r)) {
		logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
		xml_status(3);
	}

	$r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
		dbesc($dfrn_id),
		dbesc($challenge)
	);

	// find the local user who owns this relationship.

	$sql_extra = '';
	switch($direction) {
		case (-1):
			$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
			break;
		case 0:
			$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
			break;
		case 1:
			$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
			break;
		default:
			xml_status(3);
			break; // NOTREACHED
	}

	// be careful - $importer will contain both the contact information for the contact
	// sending us the post, and also the user information for the person receiving it.
	// since they are mixed together, it is easy to get them confused.

	$r = q("SELECT	`contact`.*, `contact`.`uid` AS `importer_uid`,
					`contact`.`pubkey` AS `cpubkey`,
					`contact`.`prvkey` AS `cprvkey`,
					`contact`.`thumb` AS `thumb`,
					`contact`.`url` as `url`,
					`contact`.`name` as `senderName`,
					`user`.*
			FROM `contact`
			LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
			WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
				AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
		dbesc($a->argv[1])
	);

	if (! dbm::is_result($r)) {
		logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
		xml_status(3);
		//NOTREACHED
	}

	// $importer in this case contains the contact record for the remote contact joined with the user record of our user.

	$importer = $r[0];

	logger("Remote rino version: ".$rino_remote." for ".$importer["url"], LOGGER_DEBUG);

	if((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
		q("UPDATE `contact` SET `writable` = %d, forum = %d, prv = %d WHERE `id` = %d",
			intval(($writable == (-1)) ? $importer['writable'] : $writable),
			intval($forum),
			intval($prv),
			intval($importer['id'])
		);
		if($writable != (-1))
			$importer['writable'] = $writable;
		$importer['forum'] = $page;
	}


	// if contact's ssl policy changed, update our links

	fix_contact_ssl_policy($importer,$ssl_policy);

	logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
	logger('dfrn_notify: data: ' . $data, LOGGER_DATA);

	if($dissolve == 1) {

		/*
		 * Relationship is dissolved permanently
		 */

		require_once('include/Contact.php');
		contact_remove($importer['id']);
		logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
		xml_status(0);

	}


	// If we are setup as a soapbox we aren't accepting input from this person
	// This behaviour is deactivated since it really doesn't make sense to even disallow comments
	// The check if someone is a friend or simply a follower is done in a later place so it needn't to be done here
	//if($importer['page-flags'] == PAGE_SOAPBOX)
	//	xml_status(0);

	$rino = get_config('system','rino_encrypt');
	$rino = intval($rino);
	// use RINO1 if mcrypt isn't installed and RINO2 was selected
	if ($rino == 2 and !function_exists('mcrypt_create_iv')) {
		$rino = 1;
	}

	logger("Local rino version: ". $rino, LOGGER_DEBUG);

	if(strlen($key)) {

		// if local rino is lower than remote rino, abort: should not happen!
		// but only for $remote_rino > 1, because old code did't send rino version
		if ($rino_remote_version > 1 && $rino < $rino_remote) {
			logger("rino version '$rino_remote' is lower than supported '$rino'");
			xml_status(0,"rino version '$rino_remote' is lower than supported '$rino'");
		}

		$rawkey = hex2bin(trim($key));
		logger('rino: md5 raw key: ' . md5($rawkey));
		$final_key = '';

		if($dfrn_version >= 2.1) {
			if((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
				openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
			}
			else {
				openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
			}
		}
		else {
			if((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
				openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
{'fraction_non_alphanumeric': 0.20056022408963586, 'fraction_numerical': 0.009603841536614645, 'mean_word_length': 3.7531380753138075, 'pattern_counts': {'":': 0, '<': 7, '<?xml version=': 0, '>': 13, 'https://': 2, 'lorem ipsum': 0, 'www.': 0, 'xml': 12}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '4184159', 'n_tokens_mistral': 4997, 'n_tokens_neox': 4557, 'n_words': 1044}