friendica/include/follow.php

<?php
/**
 * @file include/follow.php
 */
use Friendica\App;
use Friendica\Core\Config;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBM;
use Friendica\Network\Probe;
use Friendica\Object\Contact;
use Friendica\Protocol\Diaspora;
use Friendica\Protocol\OStatus;
use Friendica\Protocol\PortableContact;
use Friendica\Protocol\Salmon;

require_once 'include/group.php';

function update_contact($id) {
	/*
	Warning: Never ever fetch the public key via Probe::uri and write it into the contacts.
	This will reliably kill your communication with Friendica contacts.
	*/

	$r = q("SELECT `url`, `nurl`, `addr`, `alias`, `batch`, `notify`, `poll`, `poco`, `network` FROM `contact` WHERE `id` = %d", intval($id));
	if (!$r)
		return false;

	$ret = Probe::uri($r[0]["url"]);

	// If Probe::uri fails the network code will be different
	if ($ret["network"] != $r[0]["network"])
		return false;

	$update = false;

	// make sure to not overwrite existing values with blank entries
	foreach ($ret AS $key => $val) {
		if (isset($r[0][$key]) && ($r[0][$key] != "") && ($val == ""))
			$ret[$key] = $r[0][$key];

		if (isset($r[0][$key]) && ($ret[$key] != $r[0][$key]))
			$update = true;
	}

	if (!$update)
		return true;

	q("UPDATE `contact` SET `url` = '%s', `nurl` = '%s', `addr` = '%s', `alias` = '%s', `batch` = '%s', `notify` = '%s', `poll` = '%s', `poco` = '%s' WHERE `id` = %d",
		dbesc($ret['url']),
		dbesc(normalise_link($ret['url'])),
		dbesc($ret['addr']),
		dbesc($ret['alias']),
		dbesc($ret['batch']),
		dbesc($ret['notify']),
		dbesc($ret['poll']),
		dbesc($ret['poco']),
		intval($id)
	);

	// Update the corresponding gcontact entry
	PortableContact::lastUpdated($ret["url"]);

	return true;
}

//
// Takes a $uid and a url/handle and adds a new contact
// Currently if the contact is DFRN, interactive needs to be true, to redirect to the
// dfrn_request page.

// Otherwise this can be used to bulk add statusnet contacts, twitter contacts, etc.
// Returns an array
//  $return['success'] boolean true if successful
//  $return['message'] error text if success is false.



function new_contact($uid, $url, $interactive = false, $network = '') {

	$result = array('cid' => -1, 'success' => false,'message' => '');

	$a = get_app();

	// remove ajax junk, e.g. Twitter

	$url = str_replace('/#!/','/',$url);

	if (! allowed_url($url)) {
		$result['message'] = t('Disallowed profile URL.');
		return $result;
	}

	if (blocked_url($url)) {
		$result['message'] = t('Blocked domain');
		return $result;
	}

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

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

	call_hooks('follow', $arr);

	if (x($arr['contact'],'name')) {
		$ret = $arr['contact'];
	} else {
		$ret = Probe::uri($url, $network, $uid, false);
	}

	if (($network != '') && ($ret['network'] != $network)) {
		logger('Expected network '.$network.' does not match actual network '.$ret['network']);
		return result;
	}

	if ($ret['network'] === NETWORK_DFRN) {
		if ($interactive) {
			if (strlen($a->path)) {
				$myaddr = bin2hex(System::baseUrl() . '/profile/' . $a->user['nickname']);
			} else {
				$myaddr = bin2hex($a->user['nickname'] . '@' . $a->get_hostname());
			}

			goaway($ret['request'] . "&addr=$myaddr");

			// NOTREACHED
		}
	} elseif (Config::get('system','dfrn_only')) {
		$result['message'] = t('This site is not configured to allow communications with other networks.') . EOL;
		$result['message'] != t('No compatible communication protocols or feeds were discovered.') . EOL;
		return $result;
	}

	// This extra param just confuses things, remove it
	if ($ret['network'] === NETWORK_DIASPORA) {
		$ret['url'] = str_replace('?absolute=true','',$ret['url']);
	}

	// do we have enough information?

	if (! ((x($ret,'name')) && (x($ret,'poll')) && ((x($ret,'url')) || (x($ret,'addr'))))) {
		$result['message'] .=  t('The profile address specified does not provide adequate information.') . EOL;
		if (! x($ret,'poll')) {
			$result['message'] .= t('No compatible communication protocols or feeds were discovered.') . EOL;
		}
		if (! x($ret,'name')) {
			$result['message'] .=  t('An author or name was not found.') . EOL;
		}
		if (! x($ret,'url')) {
			$result['message'] .=  t('No browser URL could be matched to this address.') . EOL;
		}
		if (strpos($url,'@') !== false) {
			$result['message'] .=  t('Unable to match @-style Identity Address with a known protocol or email contact.') . EOL;
			$result['message'] .=  t('Use mailto: in front of address to force email check.') . EOL;
		}
		return $result;
	}

	if ($ret['network'] === NETWORK_OSTATUS && Config::get('system','ostatus_disabled')) {
		$result['message'] .= t('The profile address specified belongs to a network which has been disabled on this site.') . EOL;
		$ret['notify'] = '';
	}

	if (! $ret['notify']) {
		$result['message'] .=  t('Limited profile. This person will be unable to receive direct/personal notifications from you.') . EOL;
	}

	$writeable = ((($ret['network'] === NETWORK_OSTATUS) && ($ret['notify'])) ? 1 : 0);

	$subhub = (($ret['network'] === NETWORK_OSTATUS) ? true : false);

	$hidden = (($ret['network'] === NETWORK_MAIL) ? 1 : 0);

	if (in_array($ret['network'], array(NETWORK_MAIL, NETWORK_DIASPORA))) {
		$writeable = 1;
	}

	// check if we already have a contact
	// the poll url is more reliable than the profile url, as we may have
	// indirect links or webfinger links

	$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `poll` IN ('%s', '%s') AND `network` = '%s' LIMIT 1",
		intval($uid),
		dbesc($ret['poll']),
		dbesc(normalise_link($ret['poll'])),
		dbesc($ret['network'])
	);

	if (!DBM::is_result($r))
		$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND `network` = '%s' LIMIT 1",
			intval($uid), dbesc(normalise_link($url)), dbesc($ret['network'])
	);

	if (DBM::is_result($r)) {
		// update contact
		$new_relation = (($r[0]['rel'] == CONTACT_IS_FOLLOWER) ? CONTACT_IS_FRIEND : CONTACT_IS_SHARING);

		$fields = array('rel' => $new_relation, 'subhub' => $subhub, 'readonly' => false);
		dba::update('contact', $fields, array('id' => $r[0]['id']));
	} else {
		$new_relation = ((in_array($ret['network'], array(NETWORK_MAIL))) ? CONTACT_IS_FRIEND : CONTACT_IS_SHARING);

		// create contact record
		$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`, `addr`, `alias`, `batch`, `notify`, `poll`, `poco`, `name`, `nick`, `network`, `pubkey`, `rel`, `priority`,
			`writable`, `hidden`, `blocked`, `readonly`, `pending`, `subhub` )
			VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d, 0, 0, 0, %d ) ",
			intval($uid),
			dbesc(datetime_convert()),
			dbesc($ret['url']),
			dbesc(normalise_link($ret['url'])),
			dbesc($ret['addr']),
			dbesc($ret['alias']),
			dbesc($ret['batch']),
			dbesc($ret['notify']),
			dbesc($ret['poll']),
			dbesc($ret['poco']),
			dbesc($ret['name']),
			dbesc($ret['nick']),
			dbesc($ret['network']),
			dbesc($ret['pubkey']),
			intval($new_relation),
			intval($ret['priority']),
			intval($writeable),
			intval($hidden),
			intval($subhub)
		);
	}

	$r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `network` = '%s' AND `uid` = %d LIMIT 1",
		dbesc($ret['url']),
		dbesc($ret['network']),
		intval($uid)
	);

	if (! DBM::is_result($r)) {
		$result['message'] .=  t('Unable to retrieve contact information.') . EOL;
		return $result;
	}

	$contact = $r[0];
	$contact_id  = $r[0]['id'];
	$result['cid'] = $contact_id;

	$def_gid = get_default_group($uid, $contact["network"]);
	if (intval($def_gid)) {
		group_add_member($uid, '', $contact_id, $def_gid);
	}

	// Update the avatar
	Contact::updateAvatar($ret['photo'], $uid, $contact_id);

	// pull feed and consume it, which should subscribe to the hub.

	Worker::add(PRIORITY_HIGH, "OnePoll", $contact_id, "force");

	$r = q("SELECT `contact`.*, `user`.* FROM `contact` INNER JOIN `user` ON `contact`.`uid` = `user`.`uid`
			WHERE `user`.`uid` = %d AND `contact`.`self` LIMIT 1",
			intval($uid)
	);

	if (DBM::is_result($r)) {
		if (($contact['network'] == NETWORK_OSTATUS) && (strlen($contact['notify']))) {
			// create a follow slap
			$item = array();
			$item['verb'] = ACTIVITY_FOLLOW;
			$item['follow'] = $contact["url"];
			$slap = OStatus::salmon($item, $r[0]);
			Salmon::slapper($r[0], $contact['notify'], $slap);
		}

		if ($contact['network'] == NETWORK_DIASPORA) {
			$ret = Diaspora::sendShare($a->user, $contact);
			logger('share returns: '.$ret);
		}
	}

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