src/Module/BaseApi.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, 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\Module;
  23
  24 use DateTime;
  25 use Friendica\App;
  26 use Friendica\App\Router;
  27 use Friendica\BaseModule;
  28 use Friendica\Core\L10n;
  29 use Friendica\Core\Logger;
  30 use Friendica\Core\System;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Item;
  35 use Friendica\Model\Post;
  36 use Friendica\Model\User;
  37 use Friendica\Module\Api\ApiResponse;
  38 use Friendica\Module\Special\HTTPException as ModuleHTTPException;
  39 use Friendica\Network\HTTPException;
  40 use Friendica\Object\Api\Mastodon\TimelineOrderByTypes;
  41 use Friendica\Security\BasicAuth;
  42 use Friendica\Security\OAuth;
  43 use Friendica\Util\DateTimeFormat;
  44 use Friendica\Util\Profiler;
  45 use Psr\Http\Message\ResponseInterface;
  46 use Psr\Log\LoggerInterface;
  47
  48 class BaseApi extends BaseModule
  49 {
  50         const LOG_PREFIX = 'API {action} - ';
  51
  52         const SCOPE_READ   = 'read';
  53         const SCOPE_WRITE  = 'write';
  54         const SCOPE_FOLLOW = 'follow';
  55         const SCOPE_PUSH   = 'push';
  56
  57         /**
  58          * @var array
  59          */
  60         protected static $boundaries = [];
  61
  62         /**
  63          * @var array
  64          */
  65         protected static $request = [];
  66
  67         /** @var App */
  68         protected $app;
  69
  70         /** @var ApiResponse */
  71         protected $response;
  72
  73         public function __construct(App $app, L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, ApiResponse $response, array $server, array $parameters = [])
  74         {
  75                 parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
  76
  77                 $this->app = $app;
  78         }
  79
  80         /**
  81          * Additionally checks, if the caller is permitted to do this action
  82          *
  83          * {@inheritDoc}
  84          *
  85          * @throws HTTPException\ForbiddenException
  86          */
  87         public function run(ModuleHTTPException $httpException, array $request = [], bool $scopecheck = true): ResponseInterface
  88         {
  89                 if ($scopecheck) {
  90                         switch ($this->args->getMethod()) {
  91                                 case Router::DELETE:
  92                                 case Router::PATCH:
  93                                 case Router::POST:
  94                                 case Router::PUT:
  95                                         self::checkAllowedScope(self::SCOPE_WRITE);
  96
  97                                         if (!self::getCurrentUserID()) {
  98                                                 throw new HTTPException\ForbiddenException($this->t('Permission denied.'));
  99                                         }
 100                                         break;
 101                         }
 102                 }
 103
 104                 return parent::run($httpException, $request);
 105         }
 106
 107         /**
 108          * Processes data from GET requests and sets paging conditions
 109          *
 110          * @param array $request       Custom REQUEST array
 111          * @param array $condition     Existing conditions to merge
 112          * @return array paging data condition parameters data
 113          * @throws \Exception
 114          */
 115         public function addPagingConditions(array $request, array $condition): array
 116         {
 117                 $requested_order = $request['friendica_order'];
 118                 if ($requested_order == TimelineOrderByTypes::ID) {
 119                         if (!empty($request['max_id'])) {
 120                                 $condition = DBA::mergeConditions($condition, ["`uri-id` < ?", intval($request['max_id'])]);
 121                         }
 122
 123                         if (!empty($request['since_id'])) {
 124                                 $condition = DBA::mergeConditions($condition, ["`uri-id` > ?", intval($request['since_id'])]);
 125                         }
 126
 127                         if (!empty($request['min_id'])) {
 128                                 $condition = DBA::mergeConditions($condition, ["`uri-id` > ?", intval($request['min_id'])]);
 129                         }
 130                 } else {
 131                         switch ($requested_order) {
 132                                 case TimelineOrderByTypes::CREATED:
 133                                         $order_field = 'created';
 134                                         break;
 135                                 default:
 136                                         $order_field = 'uri-id';
 137                         }
 138                         if (!empty($request['max_id'])) {
 139                                 $condition = DBA::mergeConditions($condition, ["`$order_field` < ?", DateTimeFormat::convert($request['max_id'], DateTimeFormat::MYSQL)]);
 140                         }
 141
 142
 143                         if (!empty($request['min_id'])) {
 144                                 $condition = DBA::mergeConditions($condition, ["`$order_field` > ?", DateTimeFormat::convert($request['min_id'], DateTimeFormat::MYSQL)]);
 145
 146                                 $params['order'] = [$order_field];
 147                         }
 148                 }
 149
 150                 return $condition;
 151         }
 152
 153         /**
 154          * Processes data from GET requests and sets paging conditions
 155          *
 156          * @param array $request  Custom REQUEST array
 157          * @param array $params   Existing $params element to build on
 158          * @return array ordering data added to the params blocks that was passed in
 159          * @throws \Exception
 160          */
 161         public function buildOrderAndLimitParams(array $request, array $params = []): array
 162         {
 163                 $requested_order = $request['friendica_order'];
 164                 switch ($requested_order) {
 165                         case TimelineOrderByTypes::CREATED:
 166                                 $order_field = 'created';
 167                                 break;
 168                         case TimelineOrderByTypes::ID:
 169                         default:
 170                                 $order_field = 'uri-id';
 171                 }
 172
 173                 if(!empty($request['min_id'])) {
 174                         $params['order'] = [$order_field];
 175                 } else {
 176                         $params['order'] = [$order_field => true];
 177                 }
 178
 179                 $params['limit']= $request['limit'];
 180
 181                 return $params;
 182         }
 183
 184         /**
 185          * Processes data from GET requests and sets defaults
 186          *
 187          * @param array      $defaults Associative array of expected request keys and their default typed value. A null
 188          *                             value will remove the request key from the resulting value array.
 189          * @param array $request       Custom REQUEST array, superglobal instead
 190          * @return array request data
 191          * @throws \Exception
 192          */
 193         public function getRequest(array $defaults, array $request): array
 194         {
 195                 self::$request    = $request;
 196                 self::$boundaries = [];
 197
 198                 unset(self::$request['pagename']);
 199
 200                 return $this->checkDefaults($defaults, $request);
 201         }
 202
 203         /**
 204          * Set boundaries for the "link" header
 205          * @param array $boundaries
 206          * @param int $id
 207          */
 208         protected static function setBoundaries(int $id)
 209         {
 210                 if (!isset(self::$boundaries['min'])) {
 211                         self::$boundaries['min'] = $id;
 212                 }
 213
 214                 if (!isset(self::$boundaries['max'])) {
 215                         self::$boundaries['max'] = $id;
 216                 }
 217
 218                 self::$boundaries['min'] = min(self::$boundaries['min'], $id);
 219                 self::$boundaries['max'] = max(self::$boundaries['max'], $id);
 220         }
 221
 222         /**
 223          * Get the "link" header with "next" and "prev" links
 224          * @return string
 225          */
 226         protected static function getLinkHeader(bool $asDate): string
 227         {
 228                 if (empty(self::$boundaries)) {
 229                         return '';
 230                 }
 231
 232                 $request = self::$request;
 233
 234                 unset($request['min_id']);
 235                 unset($request['max_id']);
 236                 unset($request['since_id']);
 237
 238                 $prev_request = $next_request = $request;
 239
 240                 if ($asDate) {
 241                         $max_date = new DateTime();
 242                         $max_date->setTimestamp(self::$boundaries['max']);
 243                         $min_date = new DateTime();
 244                         $min_date->setTimestamp(self::$boundaries['min']);
 245                         $prev_request['min_id'] = $max_date->format(DateTimeFormat::JSON);
 246                         $next_request['max_id'] = $min_date->format(DateTimeFormat::JSON);
 247                 } else {
 248                         $prev_request['min_id'] = self::$boundaries['max'];
 249                         $next_request['max_id'] = self::$boundaries['min'];
 250                 }
 251
 252                 $command = DI::baseUrl() . '/' . DI::args()->getCommand();
 253
 254                 $prev = $command . '?' . http_build_query($prev_request);
 255                 $next = $command . '?' . http_build_query($next_request);
 256
 257                 return 'Link: <' . $next . '>; rel="next", <' . $prev . '>; rel="prev"';
 258         }
 259
 260         /**
 261          * Get the "link" header with "next" and "prev" links for an offset/limit type call
 262          * @return string
 263          */
 264         protected static function getOffsetAndLimitLinkHeader(int $offset, int $limit): string
 265         {
 266                 $request = self::$request;
 267
 268                 unset($request['offset']);
 269                 $request['limit'] = $limit;
 270
 271                 $prev_request = $next_request = $request;
 272
 273                 $prev_request['offset'] = $offset - $limit;
 274                 $next_request['offset'] = $offset + $limit;
 275
 276                 $command = DI::baseUrl() . '/' . DI::args()->getCommand();
 277
 278                 $prev = $command . '?' . http_build_query($prev_request);
 279                 $next = $command . '?' . http_build_query($next_request);
 280
 281                 if ($prev_request['offset'] >= 0) {
 282                         return 'Link: <' . $next . '>; rel="next", <' . $prev . '>; rel="prev"';
 283                 } else {
 284                         return 'Link: <' . $next . '>; rel="next"';
 285                 }
 286         }
 287
 288         /**
 289          * Set the "link" header with "next" and "prev" links
 290          * @return void
 291          */
 292         protected static function setLinkHeader(bool $asDate = false)
 293         {
 294                 $header = self::getLinkHeader($asDate);
 295                 if (!empty($header)) {
 296                         header($header);
 297                 }
 298         }
 299
 300         /**
 301          * Set the "link" header with "next" and "prev" links
 302          * @return void
 303          */
 304         protected static function setLinkHeaderByOffsetLimit(int $offset, int $limit)
 305         {
 306                 $header = self::getOffsetAndLimitLinkHeader($offset, $limit);
 307                 if (!empty($header)) {
 308                         header($header);
 309                 }
 310         }
 311
 312         /**
 313          * Check if the app is known to support quoted posts
 314          *
 315          * @return bool
 316          */
 317         public static function appSupportsQuotes(): bool
 318         {
 319                 $token = self::getCurrentApplication();
 320                 return (!empty($token['name']) && in_array($token['name'], ['Fedilab']));
 321         }
 322
 323         /**
 324          * Get current application token
 325          *
 326          * @return array token
 327          */
 328         public static function getCurrentApplication()
 329         {
 330                 $token = OAuth::getCurrentApplicationToken();
 331
 332                 if (empty($token)) {
 333                         $token = BasicAuth::getCurrentApplicationToken();
 334                 }
 335
 336                 return $token;
 337         }
 338
 339         /**
 340          * Get current user id, returns 0 if not logged in
 341          *
 342          * @return int User ID
 343          */
 344         public static function getCurrentUserID()
 345         {
 346                 $uid = OAuth::getCurrentUserID();
 347
 348                 if (empty($uid)) {
 349                         $uid = BasicAuth::getCurrentUserID(false);
 350                 }
 351
 352                 return (int)$uid;
 353         }
 354
 355         /**
 356          * Check if the provided scope does exist.
 357          * halts execution on missing scope or when not logged in.
 358          *
 359          * @param string $scope the requested scope (read, write, follow, push)
 360          */
 361         public static function checkAllowedScope(string $scope)
 362         {
 363                 $token = self::getCurrentApplication();
 364
 365                 if (empty($token)) {
 366                         Logger::notice('Empty application token');
 367                         DI::mstdnError()->Forbidden();
 368                 }
 369
 370                 if (!isset($token[$scope])) {
 371                         Logger::warning('The requested scope does not exist', ['scope' => $scope, 'application' => $token]);
 372                         DI::mstdnError()->Forbidden();
 373                 }
 374
 375                 if (empty($token[$scope])) {
 376                         Logger::warning('The requested scope is not allowed', ['scope' => $scope, 'application' => $token]);
 377                         DI::mstdnError()->Forbidden();
 378                 }
 379         }
 380
 381         public static function checkThrottleLimit()
 382         {
 383                 $uid = self::getCurrentUserID();
 384
 385                 // Check for throttling (maximum posts per day, week and month)
 386                 $throttle_day = DI::config()->get('system', 'throttle_limit_day');
 387                 if ($throttle_day > 0) {
 388                         $datefrom = date(DateTimeFormat::MYSQL, time() - 24*60*60);
 389
 390                         $condition = ["`gravity` = ? AND `uid` = ? AND `wall` AND `received` > ?", Item::GRAVITY_PARENT, $uid, $datefrom];
 391                         $posts_day = Post::countThread($condition);
 392
 393                         if ($posts_day > $throttle_day) {
 394                                 Logger::notice('Daily posting limit reached', ['uid' => $uid, 'posts' => $posts_day, 'limit' => $throttle_day]);
 395                                 $error = DI::l10n()->t('Too Many Requests');
 396                                 $error_description = DI::l10n()->tt("Daily posting limit of %d post reached. The post was rejected.", "Daily posting limit of %d posts reached. The post was rejected.", $throttle_day);
 397                                 $errorobj = new \Friendica\Object\Api\Mastodon\Error($error, $error_description);
 398                                 System::jsonError(429, $errorobj->toArray());
 399                         }
 400                 }
 401
 402                 $throttle_week = DI::config()->get('system', 'throttle_limit_week');
 403                 if ($throttle_week > 0) {
 404                         $datefrom = date(DateTimeFormat::MYSQL, time() - 24*60*60*7);
 405
 406                         $condition = ["`gravity` = ? AND `uid` = ? AND `wall` AND `received` > ?", Item::GRAVITY_PARENT, $uid, $datefrom];
 407                         $posts_week = Post::countThread($condition);
 408
 409                         if ($posts_week > $throttle_week) {
 410                                 Logger::notice('Weekly posting limit reached', ['uid' => $uid, 'posts' => $posts_week, 'limit' => $throttle_week]);
 411                                 $error = DI::l10n()->t('Too Many Requests');
 412                                 $error_description = DI::l10n()->tt("Weekly posting limit of %d post reached. The post was rejected.", "Weekly posting limit of %d posts reached. The post was rejected.", $throttle_week);
 413                                 $errorobj = new \Friendica\Object\Api\Mastodon\Error($error, $error_description);
 414                                 System::jsonError(429, $errorobj->toArray());
 415                         }
 416                 }
 417
 418                 $throttle_month = DI::config()->get('system', 'throttle_limit_month');
 419                 if ($throttle_month > 0) {
 420                         $datefrom = date(DateTimeFormat::MYSQL, time() - 24*60*60*30);
 421
 422                         $condition = ["`gravity` = ? AND `uid` = ? AND `wall` AND `received` > ?", Item::GRAVITY_PARENT, $uid, $datefrom];
 423                         $posts_month = Post::countThread($condition);
 424
 425                         if ($posts_month > $throttle_month) {
 426                                 Logger::notice('Monthly posting limit reached', ['uid' => $uid, 'posts' => $posts_month, 'limit' => $throttle_month]);
 427                                 $error = DI::l10n()->t('Too Many Requests');
 428                                 $error_description = DI::l10n()->tt('Monthly posting limit of %d post reached. The post was rejected.', 'Monthly posting limit of %d posts reached. The post was rejected.', $throttle_month);
 429                                 $errorobj = new \Friendica\Object\Api\Mastodon\Error($error, $error_description);
 430                                 System::jsonError(429, $errorobj->toArray());
 431                         }
 432                 }
 433         }
 434
 435         public static function getContactIDForSearchterm(string $screen_name = null, string $profileurl = null, int $cid = null, int $uid)
 436         {
 437                 if (!empty($cid)) {
 438                         return $cid;
 439                 }
 440
 441                 if (!empty($profileurl)) {
 442                         return Contact::getIdForURL($profileurl);
 443                 }
 444
 445                 if (empty($cid) && !empty($screen_name)) {
 446                         if (strpos($screen_name, '@') !== false) {
 447                                 return Contact::getIdForURL($screen_name, 0, false);
 448                         }
 449
 450                         $user = User::getByNickname($screen_name, ['uid']);
 451                         if (!empty($user['uid'])) {
 452                                 return Contact::getPublicIdByUserId($user['uid']);
 453                         }
 454                 }
 455
 456                 if ($uid != 0) {
 457                         return Contact::getPublicIdByUserId($uid);
 458                 }
 459
 460                 return null;
 461         }
 462 }