upload.php

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<?php
$guid = (int) get_input('guid');
$owner = get_user($guid);
if (!$owner || !$owner->canEdit()) {
    return elgg_error_response(elgg_echo('avatar:upload:fail'));
}

if (get_input('avatar_remove')) {
    if (!$owner->deleteIcon()) {
        return elgg_error_response(elgg_echo('avatar:remove:fail'));
    }
    
    return elgg_ok_response('', elgg_echo('avatar:remove:success'));
}

/* @var $avatar \Symfony\Component\HttpFoundation\File\UploadedFile */
$avatar = elgg_get_uploaded_file('avatar', false);
if (!empty($avatar) && !$avatar->isValid()) {
    $error = elgg_get_friendly_upload_error($avatar->getError());
    
    return elgg_error_response($error);
} elseif (empty($avatar)) {
    return elgg_error_response(elgg_echo('avatar:upload:fail'));
}

if (!$owner->saveIconFromUploadedFile('avatar')) {
    return elgg_error_response(elgg_echo('avatar:resize:fail'));
}

if (!elgg_trigger_event('profileiconupdate', $owner->type, $owner)) {
    return elgg_error_response();
}

// River
$view = 'river/user/default/profileiconupdate';

// remove old river items
elgg_delete_river([
    'subject_guid' => $owner->guid,
    'view' => $view,
    'limit' => false,
]);

// create new river entry
elgg_create_river_item([
    'view' => $view,
    'action_type' => 'update',
    'subject_guid' => $owner->guid,
    'object_guid' => $owner->guid,
]);

return elgg_ok_response('', elgg_echo('avatar:upload:success'));