friendica/src/Contact/Avatar.php

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<?php
/**
* @copyright Copyright (C) 2010-2022, the Friendica project
*
* @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\Contact;
use Friendica\Core\Logger;
use Friendica\DI;
use Friendica\Model\Item;
use Friendica\Network\HTTPClient\Client\HttpClientAccept;
use Friendica\Network\HTTPClient\Client\HttpClientOptions;
use Friendica\Object\Image;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\HTTPSignature;
use Friendica\Util\Images;
use Friendica\Util\Network;
use Friendica\Util\Proxy;
use Friendica\Util\Strings;
/**
* functions for handling contact avatar caching
*/
class Avatar
{
const BASE_PATH = '/avatar/';
/**
* Returns a field array with locally cached avatar pictures
*
* @param array $contact
* @param string $avatar
* @return array
*/
public static function fetchAvatarContact(array $contact, string $avatar): array
{
$fields = ['avatar' => $avatar, 'avatar-date' => DateTimeFormat::utcNow(), 'photo' => '', 'thumb' => '', 'micro' => ''];
if (!DI::config()->get('system', 'avatar_cache')) {
self::deleteCache($contact);
return $fields;
}
if (Network::isLocalLink($avatar)) {
return $fields;
}
if ($avatar != $contact['avatar']) {
self::deleteCache($contact);
Logger::debug('Avatar file name changed', ['new' => $avatar, 'old' => $contact['avatar']]);
} elseif (self::isCacheFile($contact['photo']) && self::isCacheFile($contact['thumb']) && self::isCacheFile($contact['micro'])) {
$fields['photo'] = $contact['photo'];
$fields['thumb'] = $contact['thumb'];
$fields['micro'] = $contact['micro'];
Logger::debug('Using existing cache files', ['uri-id' => $contact['uri-id'], 'fields' => $fields]);
return $fields;
}
$guid = Item::guidFromUri($contact['url'], parse_url($contact['url'], PHP_URL_HOST));
$filename = substr($guid, 0, 2) . '/' . substr($guid, 3, 2) . '/' . substr($guid, 5, 3) . '/' .
substr($guid, 9, 2) .'/' . substr($guid, 11, 2) . '/' . substr($guid, 13, 4). '/' . substr($guid, 18) . '-';
$fetchResult = HTTPSignature::fetchRaw($avatar, 0, [HttpClientOptions::ACCEPT_CONTENT => [HttpClientAccept::IMAGE]]);
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$img_str = $fetchResult->getBody();
if (empty($img_str)) {
Logger::debug('Avatar is invalid', ['avatar' => $avatar]);
return $fields;
}
$image = new Image($img_str, Images::getMimeTypeByData($img_str));
if (!$image->isValid()) {
Logger::debug('Avatar picture is invalid', ['avatar' => $avatar]);
return $fields;
}
$fields['photo'] = self::storeAvatarCache($image, $filename, Proxy::PIXEL_SMALL);
$fields['thumb'] = self::storeAvatarCache($image, $filename, Proxy::PIXEL_THUMB);
$fields['micro'] = self::storeAvatarCache($image, $filename, Proxy::PIXEL_MICRO);
Logger::debug('Storing new avatar cache', ['uri-id' => $contact['uri-id'], 'fields' => $fields]);
return $fields;
}
private static function storeAvatarCache(Image $image, string $filename, int $size): string
{
$image->scaleDown($size);
if (is_null($image) || !$image->isValid()) {
return '';
}
$path = self::BASE_PATH . $filename . $size . '.' . $image->getExt();
$filepath = DI::basePath() . $path;
$dirpath = DI::basePath() . self::BASE_PATH;
DI::profiler()->startRecording('file');
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// Fetch the permission and group ownership of the "avatar" path and apply to all files
$dir_perm = fileperms($dirpath) & 0777;
$file_perm = fileperms($dirpath) & 0666;
$group = filegroup($dirpath);
// Check directory permissions of all parts of the path
foreach (explode('/', dirname($filename)) as $part) {
$dirpath .= $part . '/';
if (!file_exists($dirpath)) {
mkdir($dirpath, $dir_perm);
} elseif (fileperms($dirpath) & 0777 != $dir_perm) {
chmod($dirpath, $dir_perm);
}
if (filegroup($dirpath) != $group) {
chgrp($dirpath, $group);
}
}
file_put_contents($filepath, $image->asString());
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chmod($filepath, $file_perm);
chgrp($filepath, $group);
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DI::profiler()->stopRecording();
if (!file_exists($filepath)) {
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Logger::warning('Avatar cache file could not be stored', ['file' => $filepath]);
return '';
}
return DI::baseUrl() . $path;
}
/**
* Check if the avatar cache file is locally stored
*
* @param string $avatar
* @return boolean
*/
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private static function isCacheFile(string $avatar): bool
{
return !empty(self::getCacheFile($avatar));
}
/**
* Fetch the name of locally cached avatar pictures
*
* @param string $avatar
* @return string
*/
private static function getCacheFile(string $avatar): string
{
if (empty($avatar) || !Network::isLocalLink($avatar)) {
return '';
}
$path = Strings::normaliseLink(DI::baseUrl() . self::BASE_PATH);
if (Network::getUrlMatch($path, $avatar) != $path) {
return '';
}
$filename = str_replace($path, DI::basePath(). self::BASE_PATH, Strings::normaliseLink($avatar));
DI::profiler()->startRecording('file');
$exists = file_exists($filename);
DI::profiler()->stopRecording();
if (!$exists) {
return '';
}
return $filename;
}
/**
* Delete locally cached avatar pictures of a contact
*
* @param string $avatar
* @return void
*/
public static function deleteCache(array $contact)
{
self::deleteCacheFile($contact['photo']);
self::deleteCacheFile($contact['thumb']);
self::deleteCacheFile($contact['micro']);
}
/**
* Delete a locally cached avatar picture
*
* @param string $avatar
* @return void
*/
private static function deleteCacheFile(string $avatar)
{
$localFile = self::getCacheFile($avatar);
if (!empty($localFile)) {
unlink($localFile);
Logger::debug('Unlink avatar', ['avatar' => $avatar]);
}
}
}