friendica/src/Model/Contact.php

<?php
/**
 * @copyright Copyright (C) 2020, Friendica
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

namespace Friendica\Model;

use Friendica\App\BaseURL;
use Friendica\Content\Pager;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\Session;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Notify\Type;
use Friendica\Network\HTTPException;
use Friendica\Network\Probe;
use Friendica\Protocol\Activity;
use Friendica\Protocol\ActivityPub;
use Friendica\Protocol\DFRN;
use Friendica\Protocol\Diaspora;
use Friendica\Protocol\OStatus;
use Friendica\Protocol\Salmon;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Images;
use Friendica\Util\Network;
use Friendica\Util\Strings;

/**
 * functions for interacting with a contact
 */
class Contact
{
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_NORMAL
	 */
	const PAGE_NORMAL    = User::PAGE_FLAGS_NORMAL;
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_SOAPBOX
	 */
	const PAGE_SOAPBOX   = User::PAGE_FLAGS_SOAPBOX;
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_COMMUNITY
	 */
	const PAGE_COMMUNITY = User::PAGE_FLAGS_COMMUNITY;
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_FREELOVE
	 */
	const PAGE_FREELOVE  = User::PAGE_FLAGS_FREELOVE;
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_BLOG
	 */
	const PAGE_BLOG      = User::PAGE_FLAGS_BLOG;
	/**
	 * @deprecated since version 2019.03
	 * @see User::PAGE_FLAGS_PRVGROUP
	 */
	const PAGE_PRVGROUP  = User::PAGE_FLAGS_PRVGROUP;
	/**
	 * @}
	 */

	/**
	 * Account types
	 *
	 * TYPE_UNKNOWN - the account has been imported from gcontact where this is the default type value
	 *
	 * TYPE_PERSON - the account belongs to a person
	 *	Associated page types: PAGE_NORMAL, PAGE_SOAPBOX, PAGE_FREELOVE
	 *
	 * TYPE_ORGANISATION - the account belongs to an organisation
	 *	Associated page type: PAGE_SOAPBOX
	 *
	 * TYPE_NEWS - the account is a news reflector
	 *	Associated page type: PAGE_SOAPBOX
	 *
	 * TYPE_COMMUNITY - the account is community forum
	 *	Associated page types: PAGE_COMMUNITY, PAGE_PRVGROUP
	 *
	 * TYPE_RELAY - the account is a relay
	 *      This will only be assigned to contacts, not to user accounts
	 * @{
	 */
	const TYPE_UNKNOWN =     -1;
	const TYPE_PERSON =       User::ACCOUNT_TYPE_PERSON;
	const TYPE_ORGANISATION = User::ACCOUNT_TYPE_ORGANISATION;
	const TYPE_NEWS =         User::ACCOUNT_TYPE_NEWS;
	const TYPE_COMMUNITY =    User::ACCOUNT_TYPE_COMMUNITY;
	const TYPE_RELAY =        User::ACCOUNT_TYPE_RELAY;
	/**
	 * @}
	 */

	/**
	 * Contact_is
	 *
	 * Relationship types
	 * @{
	 */
	const FOLLOWER = 1;
	const SHARING  = 2;
	const FRIEND   = 3;
	/**
	 * @}
	 */

	/**
	 * @param array $fields    Array of selected fields, empty for all
	 * @param array $condition Array of fields for condition
	 * @param array $params    Array of several parameters
	 * @return array
	 * @throws \Exception
	 */
	public static function selectToArray(array $fields = [], array $condition = [], array $params = [])
	{
		return DBA::selectToArray('contact', $fields, $condition, $params);
	}

	/**
	 * @param array $fields    Array of selected fields, empty for all
	 * @param array $condition Array of fields for condition
	 * @param array $params    Array of several parameters
	 * @return array
	 * @throws \Exception
	 */
	public static function selectFirst(array $fields = [], array $condition = [], array $params = [])
	{
		$contact = DBA::selectFirst('contact', $fields, $condition, $params);

		return $contact;
	}

	/**
	 * Insert a row into the contact table
	 * Important: You can't use DBA::lastInsertId() after this call since it will be set to 0.
	 *
	 * @param array        $fields              field array
	 * @param bool         $on_duplicate_update Do an update on a duplicate entry
	 *
	 * @return boolean was the insert successful?
	 * @throws \Exception
	 */
	public static function insert(array $fields, bool $on_duplicate_update = false)
	{
		$ret = DBA::insert('contact', $fields, $on_duplicate_update);
		$contact = DBA::selectFirst('contact', ['nurl', 'uid'], ['id' => DBA::lastInsertId()]);
		if (!DBA::isResult($contact)) {
			// Shouldn't happen
			return $ret;
		}

		// Search for duplicated contacts and get rid of them
		self::removeDuplicates($contact['nurl'], $contact['uid']);

		return $ret;
	}

	/**
	 * @param integer $id     Contact ID
	 * @param array   $fields Array of selected fields, empty for all
	 * @return array|boolean Contact record if it exists, false otherwise
	 * @throws \Exception
	 */
	public static function getById($id, $fields = [])
	{
		return DBA::selectFirst('contact', $fields, ['id' => $id]);
	}

	/**
	 * Fetches a contact by a given url
	 *
	 * @param string  $url    profile url
	 * @param boolean $update true = always update, false = never update, null = update when not found or outdated
	 * @param array   $fields Field list
	 * @param integer $uid    User ID of the contact
	 * @return array contact array
	 */
	public static function getByURL(string $url, $update = null, array $fields = [], int $uid = 0)
	{
		if ($update || is_null($update)) {
			$cid = self::getIdForURL($url, $uid, $update);
			if (empty($cid)) {
				return [];
			}
			return self::getById($cid, $fields);
		}

		// Add internal fields
		$removal = [];
		if (!empty($fields)) {
			foreach (['id', 'updated', 'network'] as $internal) {
				if (!in_array($internal, $fields)) {
					$fields[] = $internal;
					$removal[] = $internal;
				}
			}
		}

		// We first try the nurl (http://server.tld/nick), most common case
		$options = ['order' => ['id']];
		$contact = DBA::selectFirst('contact', $fields, ['nurl' => Strings::normaliseLink($url), 'uid' => $uid, 'deleted' => false], $options);

		// Then the addr (nick@server.tld)
		if (!DBA::isResult($contact)) {
			$contact = DBA::selectFirst('contact', $fields, ['addr' => str_replace('acct:', '', $url), 'uid' => $uid, 'deleted' => false], $options);
		}

		// Then the alias (which could be anything)
		if (!DBA::isResult($contact)) {
			// The link could be provided as http although we stored it as https
			$ssl_url = str_replace('http://', 'https://', $url);
			$condition = ['`alias` IN (?, ?, ?) AND `uid` = ? AND NOT `deleted`', $url, Strings::normaliseLink($url), $ssl_url, $uid];
			$contact = DBA::selectFirst('contact', $fields, $condition, $options);
		}
		
		// Update the contact in the background if needed
		if ((($contact['updated'] < DateTimeFormat::utc('now -7 days')) || empty($contact['avatar'])) &&
			in_array($contact['network'], Protocol::FEDERATED)) {
			Worker::add(PRIORITY_LOW, "UpdateContact", $contact['id'], ($uid == 0 ? 'force' : ''));
		}

		// Remove the internal fields
		foreach ($removal as $internal) {
			unset($contact[$internal]);
		}

		return $contact;
	}

	/**
	 * Fetches a contact for a given user by a given url.
	 * In difference to "getByURL" the function will fetch a public contact when no user contact had been found.
	 *
	 * @param string  $url    profile url
	 * @param integer $uid    User ID of the contact
	 * @param boolean $update true = always update, false = never update, null = update when not found or outdated
	 * @param array   $fields Field list
	 * @return array contact array
	 */
	public static function getByURLForUser(string $url, int $uid = 0, $update = false, array $fields = [])
	{
		if ($uid != 0) {
			$contact = self::getByURL($url, $update, $fields, $uid);
			if (!empty($contact)) {
				if (!empty($contact['id'])) {
					$contact['cid'] = $contact['id'];
					$contact['zid'] = 0;
				}
				return $contact;
			}
		}

		$contact = self::getByURL($url, $update, $fields);
		if (!empty($contact['id'])) {		
			$contact['cid'] = 0;
			$contact['zid'] = $contact['id'];
		}
		return $contact;
	}

	/**
	 * Tests if the given contact is a follower
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return boolean is the contact id a follower?
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function isFollower($cid, $uid)
	{
		if (self::isBlockedByUser($cid, $uid)) {
			return false;
		}

		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata['user'])) {
			return false;
		}

		$condition = ['id' => $cdata['user'], 'rel' => [self::FOLLOWER, self::FRIEND]];
		return DBA::exists('contact', $condition);
	}

	/**
	 * Tests if the given contact url is a follower
	 *
	 * @param string $url Contact URL
	 * @param int    $uid User ID
	 *
	 * @return boolean is the contact id a follower?
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function isFollowerByURL($url, $uid)
	{
		$cid = self::getIdForURL($url, $uid, false);

		if (empty($cid)) {
			return false;
		}

		return self::isFollower($cid, $uid);
	}

	/**
	 * Tests if the given user follow the given contact
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return boolean is the contact url being followed?
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function isSharing($cid, $uid)
	{
		if (self::isBlockedByUser($cid, $uid)) {
			return false;
		}

		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata['user'])) {
			return false;
		}

		$condition = ['id' => $cdata['user'], 'rel' => [self::SHARING, self::FRIEND]];
		return DBA::exists('contact', $condition);
	}

	/**
	 * Tests if the given user follow the given contact url
	 *
	 * @param string $url Contact URL
	 * @param int    $uid User ID
	 *
	 * @return boolean is the contact url being followed?
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function isSharingByURL($url, $uid)
	{
		$cid = self::getIdForURL($url, $uid, false);

		if (empty($cid)) {
			return false;
		}

		return self::isSharing($cid, $uid);
	}

	/**
	 * Get the basepath for a given contact link
	 *
	 * @param string $url The contact link
	 * @param boolean $dont_update Don't update the contact
	 *
	 * @return string basepath
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function getBasepath($url, $dont_update = false)
	{
		$contact = DBA::selectFirst('contact', ['id', 'baseurl'], ['uid' => 0, 'nurl' => Strings::normaliseLink($url)]);
		if (!DBA::isResult($contact)) {
			return '';
		}

		if (!empty($contact['baseurl'])) {
			return $contact['baseurl'];
		} elseif ($dont_update) {
			return '';
		}

		// Update the existing contact
		self::updateFromProbe($contact['id'], '', true);

		// And fetch the result
		$contact = DBA::selectFirst('contact', ['baseurl'], ['id' => $contact['id']]);
		if (empty($contact['baseurl'])) {
			Logger::info('No baseurl for contact', ['url' => $url]);
			return '';
		}

		Logger::info('Found baseurl for contact', ['url' => $url, 'baseurl' => $contact['baseurl']]);
		return $contact['baseurl'];
	}

	/**
	 * Check if the given contact url is on the same server
	 *
	 * @param string $url The contact link
	 *
	 * @return boolean Is it the same server?
	 */
	public static function isLocal($url)
	{
		return Strings::compareLink(self::getBasepath($url, true), DI::baseUrl());
	}

	/**
	 * Check if the given contact ID is on the same server
	 *
	 * @param string $url The contact link
	 *
	 * @return boolean Is it the same server?
	 */
	public static function isLocalById(int $cid)
	{
		$contact = DBA::selectFirst('contact', ['url', 'baseurl'], ['id' => $cid]);
		if (!DBA::isResult($contact)) {
			return false;
		}

		if (empty($contact['baseurl'])) {
			$baseurl = self::getBasepath($contact['url'], true);
		} else {
			$baseurl = $contact['baseurl'];
		}

		return Strings::compareLink($baseurl, DI::baseUrl());
	}

	/**
	 * Returns the public contact id of the given user id
	 *
	 * @param  integer $uid User ID
	 *
	 * @return integer|boolean Public contact id for given user id
	 * @throws \Exception
	 */
	public static function getPublicIdByUserId($uid)
	{
		$self = DBA::selectFirst('contact', ['url'], ['self' => true, 'uid' => $uid]);
		if (!DBA::isResult($self)) {
			return false;
		}
		return self::getIdForURL($self['url'], 0, false);
	}

	/**
	 * Returns the contact id for the user and the public contact id for a given contact id
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return array with public and user's contact id
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function getPublicAndUserContacID($cid, $uid)
	{
		if (empty($uid) || empty($cid)) {
			return [];
		}

		$contact = DBA::selectFirst('contact', ['id', 'uid', 'url'], ['id' => $cid]);
		if (!DBA::isResult($contact)) {
			return [];
		}

		// We quit when the user id don't match the user id of the provided contact
		if (($contact['uid'] != $uid) && ($contact['uid'] != 0)) {
			return [];
		}

		if ($contact['uid'] != 0) {
			$pcid = Contact::getIdForURL($contact['url'], 0, false, ['url' => $contact['url']]);
			if (empty($pcid)) {
				return [];
			}
			$ucid = $contact['id'];
		} else {
			$pcid = $contact['id'];
			$ucid = Contact::getIdForURL($contact['url'], $uid, false);
		}

		return ['public' => $pcid, 'user' => $ucid];
	}

	/**
	 * Returns contact details for a given contact id in combination with a user id
	 *
	 * @param int $cid A contact ID
	 * @param int $uid The User ID
	 * @param array $fields The selected fields for the contact
	 *
	 * @return array The contact details
	 *
	 * @throws \Exception
	 */
	public static function getContactForUser($cid, $uid, array $fields = [])
	{
		$contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => $uid]);

		if (!DBA::isResult($contact)) {
			return [];
		} else {
			return $contact;
		}
	}

	/**
	 * Block contact id for user id
	 *
	 * @param int     $cid     Either public contact id or user's contact id
	 * @param int     $uid     User ID
	 * @param boolean $blocked Is the contact blocked or unblocked?
	 * @throws \Exception
	 */
	public static function setBlockedForUser($cid, $uid, $blocked)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		if ($cdata['user'] != 0) {
			DBA::update('contact', ['blocked' => $blocked], ['id' => $cdata['user'], 'pending' => false]);
		}

		DBA::update('user-contact', ['blocked' => $blocked], ['cid' => $cdata['public'], 'uid' => $uid], true);
	}

	/**
	 * Returns "block" state for contact id and user id
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return boolean is the contact id blocked for the given user?
	 * @throws \Exception
	 */
	public static function isBlockedByUser($cid, $uid)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		$public_blocked = false;

		if (!empty($cdata['public'])) {
			$public_contact = DBA::selectFirst('user-contact', ['blocked'], ['cid' => $cdata['public'], 'uid' => $uid]);
			if (DBA::isResult($public_contact)) {
				$public_blocked = $public_contact['blocked'];
			}
		}

		$user_blocked = $public_blocked;

		if (!empty($cdata['user'])) {
			$user_contact = DBA::selectFirst('contact', ['blocked'], ['id' => $cdata['user'], 'pending' => false]);
			if (DBA::isResult($user_contact)) {
				$user_blocked = $user_contact['blocked'];
			}
		}

		if ($user_blocked != $public_blocked) {
			DBA::update('user-contact', ['blocked' => $user_blocked], ['cid' => $cdata['public'], 'uid' => $uid], true);
		}

		return $user_blocked;
	}

	/**
	 * Ignore contact id for user id
	 *
	 * @param int     $cid     Either public contact id or user's contact id
	 * @param int     $uid     User ID
	 * @param boolean $ignored Is the contact ignored or unignored?
	 * @throws \Exception
	 */
	public static function setIgnoredForUser($cid, $uid, $ignored)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		if ($cdata['user'] != 0) {
			DBA::update('contact', ['readonly' => $ignored], ['id' => $cdata['user'], 'pending' => false]);
		}

		DBA::update('user-contact', ['ignored' => $ignored], ['cid' => $cdata['public'], 'uid' => $uid], true);
	}

	/**
	 * Returns "ignore" state for contact id and user id
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return boolean is the contact id ignored for the given user?
	 * @throws \Exception
	 */
	public static function isIgnoredByUser($cid, $uid)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		$public_ignored = false;

		if (!empty($cdata['public'])) {
			$public_contact = DBA::selectFirst('user-contact', ['ignored'], ['cid' => $cdata['public'], 'uid' => $uid]);
			if (DBA::isResult($public_contact)) {
				$public_ignored = $public_contact['ignored'];
			}
		}

		$user_ignored = $public_ignored;

		if (!empty($cdata['user'])) {
			$user_contact = DBA::selectFirst('contact', ['readonly'], ['id' => $cdata['user'], 'pending' => false]);
			if (DBA::isResult($user_contact)) {
				$user_ignored = $user_contact['readonly'];
			}
		}

		if ($user_ignored != $public_ignored) {
			DBA::update('user-contact', ['ignored' => $user_ignored], ['cid' => $cdata['public'], 'uid' => $uid], true);
		}

		return $user_ignored;
	}

	/**
	 * Set "collapsed" for contact id and user id
	 *
	 * @param int     $cid       Either public contact id or user's contact id
	 * @param int     $uid       User ID
	 * @param boolean $collapsed are the contact's posts collapsed or uncollapsed?
	 * @throws \Exception
	 */
	public static function setCollapsedForUser($cid, $uid, $collapsed)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		DBA::update('user-contact', ['collapsed' => $collapsed], ['cid' => $cdata['public'], 'uid' => $uid], true);
	}

	/**
	 * Returns "collapsed" state for contact id and user id
	 *
	 * @param int $cid Either public contact id or user's contact id
	 * @param int $uid User ID
	 *
	 * @return boolean is the contact id blocked for the given user?
	 * @throws HTTPException\InternalServerErrorException
	 * @throws \ImagickException
	 */
	public static function isCollapsedByUser($cid, $uid)
	{
		$cdata = self::getPublicAndUserContacID($cid, $uid);
		if (empty($cdata)) {
			return;
		}

		$collapsed = false;

		if (!empty($cdata['public'])) {
			$public_contact = DBA::selectFirst('user-contact', ['collapsed'], ['cid' => $cdata['public'], 'uid' => $uid]);
			if (DBA::isResult($public_contact)) {
				$collapsed = $public_contact['collapsed'];
			}
		}

		return $collapsed;
	}

	/**
	 * Returns a list of contacts belonging in a group
	 *
	 * @param int $gid
	 * @return array
	 * @throws \Exception
	 */
	public static function getByGroupId($gid)
	{
		$return = [];

		if (intval($gid)) {
			$stmt = DBA::p('SELECT `group_member`.`contact-id`, `contact`.*
				FROM `contact`
				INNER JOIN `group_member`
					ON `contact`.`id` = `group_member`.`contact-id`
				WHERE `gid` = ?
				AND `contact`.`uid` = ?
				AND NOT `contact`.`self`
				AND NOT `contact`.`deleted`
				AND NOT `contact`.`blocked`
				AND NOT `contact`.`pending`
				ORDER BY `contact`.`name` ASC',
				$gid,
				local_user()
			);

			if (DBA::isResult($stmt)) {
				$return = DBA::toArray($stmt);
			}
		}

		return $return;
	}

	/**
	 * Creates the self-contact for the provided user id
	 *
	 * @param int $uid
	 * @return bool Operation success
	 * @throws HTTPException\InternalServerErrorException
	 */
	public static function createSelfFromUserId($uid)
	{
		// Only create the entry if it doesn't exist yet
		if (DBA::exists('contact', ['uid' => $uid, 'self' => true])) {
			return true;
		}

		$user = DBA::selectFirst('user', ['uid', 'username', 'nickname'], ['uid' => $uid]);
		if (!DBA::isResult($user)) {
			return false;
		}

		$return = DBA::insert('contact', [
			'uid'         => $user['uid'],
			'created'     => DateTimeFormat::utcNow(),
			'self'        => 1,
			'name'        => $user['username'],
			'nick'        => $user['nickname'],
			'photo'       => DI::baseUrl() . '/photo/profile/' . $user['uid'] . '.jpg',
			'thumb'       => DI::baseUrl() . '/photo/avatar/'  . $user['uid'] . '.jpg',
			'micro'       => DI::baseUrl() . '/photo/micro/'   . $user['uid'] . '.jpg',
			'blocked'     => 0,
			'pending'     => 0,
			'url'         => DI::baseUrl() . '/profile/' . $user['nickname'],
			'nurl'        => Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']),
			'addr'        => $user['nickname'] . '@' . substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3),
			'request'     => DI::baseUrl() . '/dfrn_request/' . $user['nickname'],
			'notify'      => DI::baseUrl() . '/dfrn_notify/'  . $user['nickname'],
			'poll'        => DI::baseUrl() . '/dfrn_poll/'    . $user['nickname'],
			'confirm'     => DI::baseUrl() . '/dfrn_confirm/' . $user['nickname'],
			'poco'        => DI::baseUrl() . '/poco/'         . $user['nickname'],
			'name-date'   => DateTimeFormat::utcNow(),
			'uri-date'    => DateTimeFormat::utcNow(),
			'avatar-date' => DateTimeFormat::utcNow(),
			'closeness'   => 0
		]);

		return $return;
	}

	/**
	 * Updates the self-contact for the provided user id
	 *
	 * @param int     $uid
	 * @param boolean $update_avatar Force the avatar update
	 * @throws HTTPException\InternalServerErrorException
	 */
	public static function updateSelfFromUserID($uid, $update_avatar = false)
	{
		$fields = ['id', 'name', 'nick', 'location', 'about', 'keywords', 'avatar',
			'xmpp', 'contact-type', 'forum', 'prv', 'avatar-date', 'url', 'nurl', 'unsearchable',
			'photo', 'thumb', 'micro', 'addr', 'request', 'notify', 'poll', 'confirm', 'poco'];
		$self = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
		if (!DBA::isResult($self)) {
			return;
		}

		$fields = ['nickname', 'page-flags', 'account-type'];
		$user = DBA::selectFirst('user', $fields, ['uid' => $uid]);
		if (!DBA::isResult($user)) {
			return;
		}

		$fields = ['name', 'photo', 'thumb', 'about', 'address', 'locality', 'region',
			'country-name', 'pub_keywords', 'xmpp', 'net-publish'];
		$profile = DBA::selectFirst('profile', $fields, ['uid' => $uid]);
		if (!DBA::isResult($profile)) {
			return;
		}

		$file_suffix = 'jpg';

		$fields = ['name' => $profile['name'], 'nick' => $user['nickname'],
			'avatar-date' => $self['avatar-date'], 'location' => Profile::formatLocation($profile),
			'about' => $profile['about'], 'keywords' => $profile['pub_keywords'],
			'contact-type' => $user['account-type'],
			'xmpp' => $profile['xmpp']];

		$avatar = Photo::selectFirst(['resource-id', 'type'], ['uid' => $uid, 'profile' => true]);
		if (DBA::isResult($avatar)) {
			if ($update_avatar) {
				$fields['avatar-date'] = DateTimeFormat::utcNow();
			}

			// Creating the path to the avatar, beginning with the file suffix
			$types = Images::supportedTypes();
			if (isset($types[$avatar['type']])) {
				$file_suffix = $types[$avatar['type']];
			}