The access to the profile and the list of followers/followings can now be restricted

src/Module/Profile/Profile.php

@@ -84,7 +84,7 @@ class Profile extends BaseProfile
 			$user = $this->database->selectFirst('user', ['uid'], ['nickname' => $this->parameters['nickname'] ?? '', 'account_removed' => false]);
 			if ($user) {
 				try {
-					$data = ActivityPub\Transmitter::getProfile($user['uid']);
+					$data = ActivityPub\Transmitter::getProfile($user['uid'], !ActivityPub::isAcceptedRequester($user['uid']));
 					header('Access-Control-Allow-Origin: *');
 					header('Cache-Control: max-age=23200, stale-while-revalidate=23200');
 					System::jsonExit($data, 'application/activity+json');

src/Protocol/ActivityPub.php

@@ -23,10 +23,13 @@ namespace Friendica\Protocol;
 
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\System;
 use Friendica\Model\APContact;
+use Friendica\Model\Contact;
 use Friendica\Model\User;
 use Friendica\Util\HTTPSignature;
 use Friendica\Util\JsonLD;
+use Friendica\Util\Network;
 
 /**
  * ActivityPub Protocol class
@@ -277,4 +280,44 @@ class ActivityPub
 	{
 		return !empty(APContact::getByURL($url, $update));
 	}
+
+	public static function isAcceptedRequester(int $uid = 0): bool
+	{
+		$called_by = System::callstack(1);
+
+		$signer = HTTPSignature::getSigner('', $_SERVER);
+		if (!$signer) {
+			Logger::debug('No signer', ['uid' => $uid, 'agent' => $_SERVER['HTTP_USER_AGENT'] ?? '', 'called_by' => $called_by]);
+			return false;
+		}
+
+		$apcontact = APContact::getByURL($signer);
+		if (empty($apcontact)) {
+			Logger::debug('APContact not found', ['uid' => $uid, 'handle' => $signer, 'called_by' => $called_by]);
+			return false;
+		}
+
+		if (empty($apcontact['gsid'] || empty($apcontact['baseurl']))) {
+			Logger::debug('No server found', ['uid' => $uid, 'signer' => $signer, 'called_by' => $called_by]);
+			return false;
+		}
+
+		// Check added as a precaution. It should not occur.
+		if (Network::isUrlBlocked($apcontact['baseurl'])) {
+			Logger::info('Requesting domain is blocked', ['uid' => $uid, 'id' => $apcontact['gsid'], 'url' => $apcontact['baseurl'], 'signer' => $signer, 'called_by' => $called_by]);
+			return false;
+		}
+
+		$contact = Contact::getByURL($signer, false, ['id', 'baseurl', 'gsid']);
+		if (!empty($contact) && Contact\User::isBlocked($contact['id'], $uid)) {
+			Logger::info('Requesting contact is blocked', ['uid' => $uid, 'id' => $contact['id'], 'signer' => $signer, 'baseurl' => $contact['baseurl'], 'called_by' => $called_by]);
+			return false;
+		}
+
+		// @todo Look for user blocked domains
+
+		Logger::debug('Server is an accepted requester', ['uid' => $uid, 'id' => $contact['gsid'], 'url' => $contact['baseurl'], 'signer' => $signer, 'called_by' => $called_by]);
+
+		return true;
+	}
 }

src/Protocol/ActivityPub/Transmitter.php

@@ -195,7 +195,7 @@ class Transmitter
 		}
 
 		// When we hide our friends we will only show the pure number but don't allow more.
-		$show_contacts = empty($owner['hide-friends']);
+		$show_contacts = ActivityPub::isAcceptedRequester($owner['uid']) && empty($owner['hide-friends']);
 
 		// Allow fetching the contact list when the requester is part of the list.
 		if (($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) && !empty($requester)) {
@@ -337,12 +337,13 @@ class Transmitter
 	/**
 	 * Return the ActivityPub profile of the given user
 	 *
-	 * @param int $uid User ID
+	 * @param int  $uid     User ID
+	 * @param bool $limited If limited, only the basic information is returned
 	 * @return array with profile data
 	 * @throws HTTPException\NotFoundException
 	 * @throws HTTPException\InternalServerErrorException
 	 */
-	public static function getProfile(int $uid): array
+	public static function getProfile(int $uid, bool $limited = false): array
 	{
 		$owner = User::getOwnerDataById($uid);
 		if (!isset($owner['id'])) {
@@ -372,16 +373,16 @@ class Transmitter
 		$data['preferredUsername'] = $owner['nick'];
 		$data['name'] = $owner['name'];
 
-		if (!empty($owner['country-name'] . $owner['region'] . $owner['locality'])) {
+		if (!$limited && !empty($owner['country-name'] . $owner['region'] . $owner['locality'])) {
 			$data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $owner['country-name'],
 				'vcard:region' => $owner['region'], 'vcard:locality' => $owner['locality']];
 		}
 
-		if (!empty($owner['about'])) {
+		if (!$limited && !empty($owner['about'])) {
 			$data['summary'] = BBCode::convertForUriId($owner['uri-id'] ?? 0, $owner['about'], BBCode::EXTERNAL);
 		}
 
-		if (!empty($owner['xmpp']) || !empty($owner['matrix'])) {
+		if (!$limited && (!empty($owner['xmpp']) || !empty($owner['matrix']))) {
 			$data['vcard:hasInstantMessage'] = [];
 
 			if (!empty($owner['xmpp'])) {
@@ -399,7 +400,7 @@ class Transmitter
 			'owner' => $owner['url'],
 			'publicKeyPem' => $owner['pubkey']];
 		$data['endpoints'] = ['sharedInbox' => DI::baseUrl() . '/inbox'];
-		if ($uid != 0) {
+		if (!$limited && $uid != 0) {
 			$data['icon'] = ['type' => 'Image', 'url' => User::getAvatarUrl($owner)];
 
 			$resourceid = Photo::ridFromURI($owner['photo']);