streams/include/follow.php

<?php /** @file */


//
// Takes a $uid and the channel associated with the uid, and a url/handle and adds a new channel

// Returns an array
//  $return['success'] boolean true if successful
//  $return['abook'] Address book entry joined with xchan if successful
//  $return['message'] error text if success is false.

require_once('include/zot.php');

function new_contact($uid,$url,$channel,$interactive = false, $confirm = false) {

	$result = array('success' => false,'message' => '');

	$a = get_app();

	if(! allowed_url($url)) {
		$result['message'] = t('Channel is blocked on this site.');
		return $result;
	}

	if(! $url) {
		$result['message'] = t('Channel location missing.');
		return $result;
	}

	$arr = array('url' => $url, 'channel' => array());

	call_hooks('follow', $arr);

	if($arr['channel']['success']) 
		$ret = $arr['channel'];
	else
		$ret = zot_finger($url,$channel);

	if($ret['success']) {
		$j = json_decode($ret['body'],true);
	}
	else {
		$result['message'] = t('Channel discovery failed. Website may be down or misconfigured.');
		logger('mod_follow: ' . $result['message']);
		return $result;
	}

	logger('follow: ' . $url . ' ' . print_r($j,true));

	if(! $j) {
		$result['message'] = t('Response from remote channel was not understood.');
		logger('mod_follow: ' . $result['message']);
		return $result;
	}


	if(! ($j['success'] && $j['guid'])) {
		$result['message'] = t('Response from remote channel was incomplete.');
		logger('mod_follow: ' . $result['message']);
		return $result;
	}

	// Premium channel, set confirm before callback to avoid recursion

	if(array_key_exists('connect_url',$j) && (! $confirm))
		goaway(zid($j['connect_url']));


	// check service class limits

	$r = q("select count(*) as total from abook where abook_channel = %d and not (abook_flags & %d) ",
		intval($uid),
		intval(ABOOK_FLAG_SELF)
	);
	if($r)
		$total_channels = $r[0]['total'];

	if(! service_class_allows($uid,'total_channels',$total_channels)) {
		$result['message'] = upgrade_message();
		return $result;
	}

	// do we have an xchan and hubloc?
	// If not, create them.	

	$x = import_xchan($j);

	if(! $x['success']) 
		return $x;

	$xchan_hash = $x['hash'];


	$their_perms = 0;

	$global_perms = get_perms();

	if( array_key_exists('permissions',$j) && array_key_exists('data',$j['permissions'])) {
		$permissions = aes_unencapsulate(array(
			'data' => $j['permissions']['data'],
			'key'  => $j['permissions']['key'],
			'iv'   => $j['permissions']['iv']),
			$channel['channel_prvkey']);
		if($permissions)
			$permissions = json_decode($permissions,true);
		logger('decrypted permissions: ' . print_r($permissions,true), LOGGER_DATA);
	}
	else
		$permissions = $j['permissions'];

	foreach($permissions as $k => $v) {
		if($v) {
			$their_perms = $their_perms | intval($global_perms[$k][1]);
		}
	}

	if((local_user()) && $uid == local_user()) {
		$aid = get_account_id();
		$hash = get_observer_hash();
		$ch = $a->get_channel();
		$default_group = $ch['channel_default_group'];

	}
	else {
		$r = q("select * from channel where channel_id = %d limit 1",
			intval($uid)
		);
		if(! $r) {
			$result['message'] = t('local account not found.');
			return $result;
		}
		$aid = $r[0]['channel_account_id'];
		$hash = $r[0]['channel_hash'];			
		$default_group = $r[0]['channel_default_group'];
	}
	
	if($hash == $xchan_hash) {
		$result['message'] = t('Cannot connect to yourself.');
		return $result;
	}

	$r = q("select abook_xchan from abook where abook_xchan = '%s' and abook_channel = %d limit 1",
		dbesc($xchan_hash),
		intval($uid)
	);
	if($r) {
		$x = q("update abook set abook_their_perms = %d where abook_id = %d limit 1",
			intval($their_perms),
			intval($r[0]['abook_id'])
		);		
	}
	else {
		$r = q("insert into abook ( abook_account, abook_channel, abook_xchan, abook_their_perms, abook_my_perms, abook_created, abook_updated )
			values( %d, %d, '%s', %d, %d, '%s', '%s' ) ",
			intval($aid),
			intval($uid),
			dbesc($xchan_hash),
			intval($their_perms),
			intval(PERMS_W_STREAM|PERMS_W_MAIL),
			dbesc(datetime_convert()),
			dbesc(datetime_convert())
		);
	}

	if(! $r)
		logger('mod_follow: abook creation failed');

	$r = q("select abook.*, xchan.* from abook left join xchan on abook_xchan = xchan_hash 
		where abook_xchan = '%s' and abook_channel = %d limit 1",
		dbesc($xchan_hash),
		intval($uid)
	);
	if($r) {
		$result['abook'] = $r[0];
		proc_run('php', 'include/notifier.php', 'permission_update', $result['abook']['abook_id']);
	}

	/** If there is a default group for this channel, add this member to it */

	if($default_group) {
		require_once('include/group.php');
		$g = group_rec_byhash($uid,$default_group);
		if($g)
			group_add_member($uid,'',$xchan_hash,$g['id']);
	}

	// Then send a ping/message to the other side


	$result['success'] = true;
	return $result;



}