src/Core/Protocol.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Core;
  23
  24 use Friendica\Database\DBA;
  25 use Friendica\DI;
  26 use Friendica\Model\User;
  27 use Friendica\Network\HTTPException;
  28 use Friendica\Protocol\Activity;
  29 use Friendica\Protocol\ActivityPub;
  30 use Friendica\Protocol\Diaspora;
  31 use Friendica\Protocol\OStatus;
  32 use Friendica\Protocol\Salmon;
  33
  34 /**
  35  * Manage compatibility with federated networks
  36  */
  37 class Protocol
  38 {
  39         // Native support
  40         const ACTIVITYPUB = 'apub';    // ActivityPub (Pleroma, Mastodon, Osada, ...)
  41         const DFRN        = 'dfrn';    // Friendica, Mistpark, other DFRN implementations
  42         const DIASPORA    = 'dspr';    // Diaspora, Hubzilla, Socialhome, Ganggo
  43         const FEED        = 'feed';    // RSS/Atom feeds with no known "post/notify" protocol
  44         const MAIL        = 'mail';    // IMAP/POP
  45         const OSTATUS     = 'stat';    // GNU Social and other OStatus implementations
  46
  47         const NATIVE_SUPPORT = [self::DFRN, self::DIASPORA, self::OSTATUS, self::FEED, self::MAIL, self::ACTIVITYPUB];
  48
  49         const FEDERATED = [self::DFRN, self::DIASPORA, self::OSTATUS, self::ACTIVITYPUB];
  50
  51         const SUPPORT_PRIVATE = [self::DFRN, self::DIASPORA, self::MAIL, self::ACTIVITYPUB, self::PUMPIO];
  52
  53         // Supported through a connector
  54         const DIASPORA2 = 'dspc';    // Diaspora connector
  55         const LINKEDIN  = 'lnkd';    // LinkedIn
  56         const PUMPIO    = 'pump';    // pump.io
  57         const STATUSNET = 'stac';    // Statusnet connector
  58         const TWITTER   = 'twit';    // Twitter
  59         const DISCOURSE = 'dscs';    // Discourse
  60
  61         // Dead protocols
  62         const APPNET    = 'apdn';    // app.net - Dead protocol
  63         const FACEBOOK  = 'face';    // Facebook API - Not working anymore, API is closed
  64         const GPLUS     = 'goog';    // Google+ - Dead in 2019
  65
  66         // Currently unsupported
  67         const ICALENDAR = 'ical';    // iCalendar
  68         const MYSPACE   = 'mysp';    // MySpace
  69         const NEWS      = 'nntp';    // Network News Transfer Protocol
  70         const PNUT      = 'pnut';    // pnut.io
  71         const XMPP      = 'xmpp';    // XMPP
  72         const ZOT       = 'zot!';    // Zot!
  73
  74         const PHANTOM   = 'unkn';    // Place holder
  75
  76         /**
  77          * Returns whether the provided protocol supports following
  78          *
  79          * @param $protocol
  80          * @return bool
  81          * @throws HTTPException\InternalServerErrorException
  82          */
  83         public static function supportsFollow($protocol): bool
  84         {
  85                 if (in_array($protocol, self::NATIVE_SUPPORT)) {
  86                         return true;
  87                 }
  88
  89                 $hook_data = [
  90                         'protocol' => $protocol,
  91                         'result' => null
  92                 ];
  93                 Hook::callAll('support_follow', $hook_data);
  94
  95                 return $hook_data['result'] === true;
  96         }
  97
  98         /**
  99          * Returns whether the provided protocol supports revoking inbound follows
 100          *
 101          * @param $protocol
 102          * @return bool
 103          * @throws HTTPException\InternalServerErrorException
 104          */
 105         public static function supportsRevokeFollow($protocol): bool
 106         {
 107                 if (in_array($protocol, self::NATIVE_SUPPORT)) {
 108                         return true;
 109                 }
 110
 111                 $hook_data = [
 112                         'protocol' => $protocol,
 113                         'result' => null
 114                 ];
 115                 Hook::callAll('support_revoke_follow', $hook_data);
 116
 117                 return $hook_data['result'] === true;
 118         }
 119
 120         /**
 121          * Send a follow message to a remote server.
 122          *
 123          * @param int     $uid      User Id
 124          * @param array   $contact  Contact being followed
 125          * @param ?string $protocol Expected protocol
 126          * @return bool Only returns false in the unlikely case an ActivityPub contact ID doesn't exist (???)
 127          * @throws HTTPException\InternalServerErrorException
 128          * @throws \ImagickException
 129          */
 130         public static function follow(int $uid, array $contact, ?string $protocol = null): bool
 131         {
 132                 $owner = User::getOwnerDataById($uid);
 133                 if (!DBA::isResult($owner)) {
 134                         return true;
 135                 }
 136
 137                 $protocol = $protocol ?? $contact['protocol'];
 138
 139                 if (in_array($protocol, [Protocol::OSTATUS, Protocol::DFRN])) {
 140                         // create a follow slap
 141                         $item = [
 142                                 'verb'    => Activity::FOLLOW,
 143                                 'gravity' => GRAVITY_ACTIVITY,
 144                                 'follow'  => $contact['url'],
 145                                 'body'    => '',
 146                                 'title'   => '',
 147                                 'guid'    => '',
 148                                 'uri-id'  => 0,
 149                         ];
 150
 151                         $slap = OStatus::salmon($item, $owner);
 152
 153                         if (!empty($contact['notify'])) {
 154                                 Salmon::slapper($owner, $contact['notify'], $slap);
 155                         }
 156                 } elseif ($protocol == Protocol::DIASPORA) {
 157                         $contact = Diaspora::sendShare($owner, $contact);
 158                         Logger::notice('share returns: ' . $contact);
 159                 } elseif ($protocol == Protocol::ACTIVITYPUB) {
 160                         $activity_id = ActivityPub\Transmitter::activityIDFromContact($contact['id']);
 161                         if (empty($activity_id)) {
 162                                 // This really should never happen
 163                                 return false;
 164                         }
 165
 166                         $success = ActivityPub\Transmitter::sendActivity('Follow', $contact['url'], $owner['uid'], $activity_id);
 167                         Logger::notice('Follow returns: ' . $success);
 168                 }
 169
 170                 return true;
 171         }
 172
 173         /**
 174          * Sends an unfriend message. Does not remove the contact
 175          *
 176          * @param array   $user    User unfriending
 177          * @param array   $contact Contact unfriended
 178          * @return bool|null true if successful, false if not, null if no remote action was performed
 179          * @throws HTTPException\InternalServerErrorException
 180          * @throws \ImagickException
 181          */
 182         public static function terminateFriendship(array $user, array $contact): ?bool
 183         {
 184                 if (empty($contact['network'])) {
 185                         throw new \InvalidArgumentException('Missing network key in contact array');
 186                 }
 187
 188                 $protocol = $contact['network'];
 189                 if (($protocol == Protocol::DFRN) && !empty($contact['protocol'])) {
 190                         $protocol = $contact['protocol'];
 191                 }
 192
 193                 if (in_array($protocol, [Protocol::OSTATUS, Protocol::DFRN])) {
 194                         // create an unfollow slap
 195                         $item = [];
 196                         $item['verb'] = Activity::O_UNFOLLOW;
 197                         $item['gravity'] = GRAVITY_ACTIVITY;
 198                         $item['follow'] = $contact['url'];
 199                         $item['body'] = '';
 200                         $item['title'] = '';
 201                         $item['guid'] = '';
 202                         $item['uri-id'] = 0;
 203                         $slap = OStatus::salmon($item, $user);
 204
 205                         if (empty($contact['notify'])) {
 206                                 throw new \InvalidArgumentException('Missing expected "notify" key in OStatus/DFRN contact');
 207                         }
 208
 209                         return Salmon::slapper($user, $contact['notify'], $slap) === 0;
 210                 } elseif ($protocol == Protocol::DIASPORA) {
 211                         return Diaspora::sendUnshare($user, $contact) > 0;
 212                 } elseif ($protocol == Protocol::ACTIVITYPUB) {
 213                         return ActivityPub\Transmitter::sendContactUndo($contact['url'], $contact['id'], $user['uid']);
 214                 }
 215
 216                 // Catch-all hook for connector addons
 217                 $hook_data = [
 218                         'contact' => $contact,
 219                         'result' => null
 220                 ];
 221                 Hook::callAll('unfollow', $hook_data);
 222
 223                 return $hook_data['result'];
 224         }
 225
 226         /**
 227          * Revoke an incoming follow from the provided contact
 228          *
 229          * @param array $contact Private contact (uid != 0) array
 230          * @return bool|null true if successful, false if not, null if no action was performed
 231          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 232          * @throws \ImagickException
 233          */
 234         public static function revokeFollow(array $contact): ?bool
 235         {
 236                 if (empty($contact['network'])) {
 237                         throw new \InvalidArgumentException('Missing network key in contact array');
 238                 }
 239
 240                 $protocol = $contact['network'];
 241                 if ($protocol == Protocol::DFRN && !empty($contact['protocol'])) {
 242                         $protocol = $contact['protocol'];
 243                 }
 244
 245                 if ($protocol == Protocol::ACTIVITYPUB) {
 246                         return ActivityPub\Transmitter::sendContactReject($contact['url'], $contact['hub-verify'], $contact['uid']);
 247                 }
 248
 249                 // Catch-all hook for connector addons
 250                 $hook_data = [
 251                         'contact' => $contact,
 252                         'result' => null,
 253                 ];
 254                 Hook::callAll('revoke_follow', $hook_data);
 255
 256                 return $hook_data['result'];
 257         }
 258
 259         /**
 260          * Send a block message to a remote server. Only useful for connector addons.
 261          *
 262          * @param array $contact Public contact record to block
 263          * @param int   $uid     User issuing the block
 264          * @return bool|null true if successful, false if not, null if no action was performed
 265          * @throws HTTPException\InternalServerErrorException
 266          */
 267         public static function block(array $contact, int $uid): ?bool
 268         {
 269                 // Catch-all hook for connector addons
 270                 $hook_data = [
 271                         'contact' => $contact,
 272                         'uid' => $uid,
 273                         'result' => null,
 274                 ];
 275                 Hook::callAll('block', $hook_data);
 276
 277                 return $hook_data['result'];
 278         }
 279
 280         /**
 281          * Send an unblock message to a remote server. Only useful for connector addons.
 282          *
 283          * @param array $contact Public contact record to unblock
 284          * @param int   $uid     User revoking the block
 285          * @return bool|null true if successful, false if not, null if no action was performed
 286          * @throws HTTPException\InternalServerErrorException
 287          */
 288         public static function unblock(array $contact, int $uid): ?bool
 289         {
 290                 // Catch-all hook for connector addons
 291                 $hook_data = [
 292                         'contact' => $contact,
 293                         'uid' => $uid,
 294                         'result' => null,
 295                 ];
 296                 Hook::callAll('unblock', $hook_data);
 297
 298                 return $hook_data['result'];
 299         }
 300 }