src/Model/Photo.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/Photo.php
   5  * @brief This file contains the Photo class for database interface
   6  */
   7 namespace Friendica\Model;
   8
   9 use Friendica\BaseObject;
  10 use Friendica\Core\Cache;
  11 use Friendica\Core\Config;
  12 use Friendica\Core\L10n;
  13 use Friendica\Core\Logger;
  14 use Friendica\Core\StorageManager;
  15 use Friendica\Core\System;
  16 use Friendica\Database\DBA;
  17 use Friendica\Database\DBStructure;
  18 use Friendica\Model\Storage\IStorage;
  19 use Friendica\Object\Image;
  20 use Friendica\Protocol\DFRN;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Util\Network;
  23 use Friendica\Util\Security;
  24 use Friendica\Util\Strings;
  25
  26 require_once "include/dba.php";
  27
  28 /**
  29  * Class to handle photo dabatase table
  30  */
  31 class Photo extends BaseObject
  32 {
  33         /**
  34          * @brief Select rows from the photo table and returns them as array
  35          *
  36          * @param array $fields     Array of selected fields, empty for all
  37          * @param array $conditions Array of fields for conditions
  38          * @param array $params     Array of several parameters
  39          *
  40          * @return boolean|array
  41          *
  42          * @throws \Exception
  43          * @see   \Friendica\Database\DBA::selectToArray
  44          */
  45         public static function selectToArray(array $fields = [], array $conditions = [], array $params = [])
  46         {
  47                 if (empty($fields)) {
  48                         $fields = self::getFields();
  49                 }
  50
  51                 return DBA::selectToArray('photo', $fields, $conditions, $params);
  52         }
  53
  54         /**
  55          * @brief Retrieve a single record from the photo table
  56          *
  57          * @param array $fields     Array of selected fields, empty for all
  58          * @param array $conditions Array of fields for conditions
  59          * @param array $params     Array of several parameters
  60          *
  61          * @return bool|array
  62          *
  63          * @throws \Exception
  64          * @see   \Friendica\Database\DBA::select
  65          */
  66         public static function selectFirst(array $fields = [], array $conditions = [], array $params = [])
  67         {
  68                 if (empty($fields)) {
  69                         $fields = self::getFields();
  70                 }
  71
  72                 return DBA::selectFirst("photo", $fields, $conditions, $params);
  73         }
  74
  75         /**
  76          * @brief Get photos for user id
  77          *
  78          * @param integer $uid        User id
  79          * @param string  $resourceid Rescource ID of the photo
  80          * @param array   $conditions Array of fields for conditions
  81          * @param array   $params     Array of several parameters
  82          *
  83          * @return bool|array
  84          *
  85          * @throws \Exception
  86          * @see   \Friendica\Database\DBA::select
  87          */
  88         public static function getPhotosForUser($uid, $resourceid, array $conditions = [], array $params = [])
  89         {
  90                 $conditions["resource-id"] = $resourceid;
  91                 $conditions["uid"] = $uid;
  92
  93                 return self::selectToArray([], $conditions, $params);
  94         }
  95
  96         /**
  97          * @brief Get a photo for user id
  98          *
  99          * @param integer $uid        User id
 100          * @param string  $resourceid Rescource ID of the photo
 101          * @param integer $scale      Scale of the photo. Defaults to 0
 102          * @param array   $conditions Array of fields for conditions
 103          * @param array   $params     Array of several parameters
 104          *
 105          * @return bool|array
 106          *
 107          * @throws \Exception
 108          * @see   \Friendica\Database\DBA::select
 109          */
 110         public static function getPhotoForUser($uid, $resourceid, $scale = 0, array $conditions = [], array $params = [])
 111         {
 112                 $conditions["resource-id"] = $resourceid;
 113                 $conditions["uid"] = $uid;
 114                 $conditions["scale"] = $scale;
 115
 116                 return self::selectFirst([], $conditions, $params);
 117         }
 118
 119         /**
 120          * @brief Get a single photo given resource id and scale
 121          *
 122          * This method checks for permissions. Returns associative array
 123          * on success, "no sign" image info, if user has no permission,
 124          * false if photo does not exists
 125          *
 126          * @param string  $resourceid Rescource ID of the photo
 127          * @param integer $scale      Scale of the photo. Defaults to 0
 128          *
 129          * @return boolean|array
 130          * @throws \Exception
 131          */
 132         public static function getPhoto($resourceid, $scale = 0)
 133         {
 134                 $r = self::selectFirst(["uid", "allow_cid", "allow_gid", "deny_cid", "deny_gid"], ["resource-id" => $resourceid]);
 135                 if ($r === false) {
 136                         return false;
 137                 }
 138                 $uid = $r["uid"];
 139
 140                 // This is the first place, when retrieving just a photo, that we know who owns the photo.
 141                 // Check if the photo is public (empty allow and deny means public), if so, skip auth attempt, if not
 142                 // make sure that the requester's session is appropriately authenticated to that user
 143                 // otherwise permissions checks done by getPermissionsSQLByUserId() won't work correctly
 144                 if (!empty($r["allow_cid"]) || !empty($r["allow_gid"]) || !empty($r["deny_cid"]) || !empty($r["deny_gid"])) {
 145                         $r = DBA::selectFirst("user", ["nickname"], ["uid" => $uid], []);
 146                         // this will either just return (if auth all ok) or will redirect and exit (starting over)
 147                         DFRN::autoRedir(self::getApp(), $r["nickname"]);
 148                 }
 149
 150                 $sql_acl = Security::getPermissionsSQLByUserId($uid);
 151
 152                 $conditions = [
 153                         "`resource-id` = ? AND `scale` <= ? " . $sql_acl,
 154                         $resourceid, $scale
 155                 ];
 156
 157                 $params = ["order" => ["scale" => true]];
 158
 159                 $photo = self::selectFirst([], $conditions, $params);
 160
 161                 return $photo;
 162         }
 163
 164         /**
 165          * @brief Check if photo with given conditions exists
 166          *
 167          * @param array $conditions Array of extra conditions
 168          *
 169          * @return boolean
 170          * @throws \Exception
 171          */
 172         public static function exists(array $conditions)
 173         {
 174                 return DBA::exists("photo", $conditions);
 175         }
 176
 177
 178         /**
 179          * @brief Get Image object for given row id. null if row id does not exist
 180          *
 181          * @param array $photo Photo data. Needs at least 'id', 'type', 'backend-class', 'backend-ref'
 182          *
 183          * @return \Friendica\Object\Image
 184          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 185          * @throws \ImagickException
 186          */
 187         public static function getImageForPhoto(array $photo)
 188         {
 189                 $data = "";
 190
 191                 if ($photo["backend-class"] == "") {
 192                         // legacy data storage in "data" column
 193                         $i = self::selectFirst(["data"], ["id" => $photo["id"]]);
 194                         if ($i === false) {
 195                                 return null;
 196                         }
 197                         $data = $i["data"];
 198                 } else {
 199                         $backendClass = $photo["backend-class"];
 200                         $backendRef = $photo["backend-ref"];
 201                         $data = $backendClass::get($backendRef);
 202                 }
 203
 204                 if ($data === "") {
 205                         return null;
 206                 }
 207
 208                 return new Image($data, $photo["type"]);
 209         }
 210
 211         /**
 212          * @brief Return a list of fields that are associated with the photo table
 213          *
 214          * @return array field list
 215          * @throws \Exception
 216          */
 217         private static function getFields()
 218         {
 219                 $allfields = DBStructure::definition(self::getApp()->getBasePath(), false);
 220                 $fields = array_keys($allfields["photo"]["fields"]);
 221                 array_splice($fields, array_search("data", $fields), 1);
 222                 return $fields;
 223         }
 224
 225         /**
 226          * @brief Construct a photo array for a system resource image
 227          *
 228          * @param string $filename Image file name relative to code root
 229          * @param string $mimetype Image mime type. Defaults to "image/jpeg"
 230          *
 231          * @return array
 232          * @throws \Exception
 233          */
 234         public static function createPhotoForSystemResource($filename, $mimetype = "image/jpeg")
 235         {
 236                 $fields = self::getFields();
 237                 $values = array_fill(0, count($fields), "");
 238
 239                 $photo = array_combine($fields, $values);
 240                 $photo["backend-class"] = Storage\SystemResource::class;
 241                 $photo["backend-ref"] = $filename;
 242                 $photo["type"] = $mimetype;
 243                 $photo["cacheable"] = false;
 244
 245                 return $photo;
 246         }
 247
 248
 249         /**
 250          * @brief store photo metadata in db and binary in default backend
 251          *
 252          * @param Image   $Image     Image object with data
 253          * @param integer $uid       User ID
 254          * @param integer $cid       Contact ID
 255          * @param integer $rid       Resource ID
 256          * @param string  $filename  Filename
 257          * @param string  $album     Album name
 258          * @param integer $scale     Scale
 259          * @param integer $profile   Is a profile image? optional, default = 0
 260          * @param string  $allow_cid Permissions, allowed contacts. optional, default = ""
 261          * @param string  $allow_gid Permissions, allowed groups. optional, default = ""
 262          * @param string  $deny_cid  Permissions, denied contacts.optional, default = ""
 263          * @param string  $deny_gid  Permissions, denied greoup.optional, default = ""
 264          * @param string  $desc      Photo caption. optional, default = ""
 265          *
 266          * @return boolean True on success
 267          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 268          */
 269         public static function store(Image $Image, $uid, $cid, $rid, $filename, $album, $scale, $profile = 0, $allow_cid = "", $allow_gid = "", $deny_cid = "", $deny_gid = "", $desc = "")
 270         {
 271                 $photo = self::selectFirst(["guid"], ["`resource-id` = ? AND `guid` != ?", $rid, ""]);
 272                 if (DBA::isResult($photo)) {
 273                         $guid = $photo["guid"];
 274                 } else {
 275                         $guid = System::createGUID();
 276                 }
 277
 278                 $existing_photo = self::selectFirst(["id", "created", "backend-class", "backend-ref"], ["resource-id" => $rid, "uid" => $uid, "contact-id" => $cid, "scale" => $scale]);
 279                 $created = DateTimeFormat::utcNow();
 280                 if (DBA::isResult($existing_photo)) {
 281                         $created = $existing_photo["created"];
 282                 }
 283
 284                 // Get defined storage backend.
 285                 // if no storage backend, we use old "data" column in photo table.
 286                 // if is an existing photo, reuse same backend
 287                 $data = "";
 288                 $backend_ref = "";
 289
 290                 /** @var IStorage $backend_class */
 291                 if (DBA::isResult($existing_photo)) {
 292                         $backend_ref = (string)$existing_photo["backend-ref"];
 293                         $backend_class = (string)$existing_photo["backend-class"];
 294                 } else {
 295                         $backend_class = StorageManager::getBackend();
 296                 }
 297
 298                 if ($backend_class === "") {
 299                         $data = $Image->asString();
 300                 } else {
 301                         $backend_ref = $backend_class::put($Image->asString(), $backend_ref);
 302                 }
 303
 304
 305                 $fields = [
 306                         "uid" => $uid,
 307                         "contact-id" => $cid,
 308                         "guid" => $guid,
 309                         "resource-id" => $rid,
 310                         "created" => $created,
 311                         "edited" => DateTimeFormat::utcNow(),
 312                         "filename" => basename($filename),
 313                         "type" => $Image->getType(),
 314                         "album" => $album,
 315                         "height" => $Image->getHeight(),
 316                         "width" => $Image->getWidth(),
 317                         "datasize" => strlen($Image->asString()),
 318                         "data" => $data,
 319                         "scale" => $scale,
 320                         "profile" => $profile,
 321                         "allow_cid" => $allow_cid,
 322                         "allow_gid" => $allow_gid,
 323                         "deny_cid" => $deny_cid,
 324                         "deny_gid" => $deny_gid,
 325                         "desc" => $desc,
 326                         "backend-class" => $backend_class,
 327                         "backend-ref" => $backend_ref
 328                 ];
 329
 330                 if (DBA::isResult($existing_photo)) {
 331                         $r = DBA::update("photo", $fields, ["id" => $existing_photo["id"]]);
 332                 } else {
 333                         $r = DBA::insert("photo", $fields);
 334                 }
 335
 336                 return $r;
 337         }
 338
 339
 340         /**
 341          * @brief Delete info from table and data from storage
 342          *
 343          * @param array $conditions Field condition(s)
 344          * @param array $options    Options array, Optional
 345          *
 346          * @return boolean
 347          *
 348          * @throws \Exception
 349          * @see   \Friendica\Database\DBA::delete
 350          */
 351         public static function delete(array $conditions, array $options = [])
 352         {
 353                 // get photo to delete data info
 354                 $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 355
 356                 foreach($photos as $photo) {
 357                         /** @var IStorage $backend_class */
 358                         $backend_class = (string)$photo["backend-class"];
 359                         if ($backend_class !== "") {
 360                                 $backend_class::delete($photo["backend-ref"]);
 361                         }
 362                 }
 363
 364                 return DBA::delete("photo", $conditions, $options);
 365         }
 366
 367         /**
 368          * @brief Update a photo
 369          *
 370          * @param array         $fields     Contains the fields that are updated
 371          * @param array         $conditions Condition array with the key values
 372          * @param Image         $img        Image to update. Optional, default null.
 373          * @param array|boolean $old_fields Array with the old field values that are about to be replaced (true = update on duplicate)
 374          *
 375          * @return boolean  Was the update successfull?
 376          *
 377          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 378          * @see   \Friendica\Database\DBA::update
 379          */
 380         public static function update($fields, $conditions, Image $img = null, array $old_fields = [])
 381         {
 382                 if (!is_null($img)) {
 383                         // get photo to update
 384                         $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 385
 386                         foreach($photos as $photo) {
 387                                 /** @var IStorage $backend_class */
 388                                 $backend_class = (string)$photo["backend-class"];
 389                                 if ($backend_class !== "") {
 390                                         $fields["backend-ref"] = $backend_class::put($img->asString(), $photo["backend-ref"]);
 391                                 } else {
 392                                         $fields["data"] = $img->asString();
 393                                 }
 394                         }
 395                         $fields['updated'] = DateTimeFormat::utcNow();
 396                 }
 397
 398                 $fields['edited'] = DateTimeFormat::utcNow();
 399
 400                 return DBA::update("photo", $fields, $conditions, $old_fields);
 401         }
 402
 403         /**
 404          * @param string  $image_url     Remote URL
 405          * @param integer $uid           user id
 406          * @param integer $cid           contact id
 407          * @param boolean $quit_on_error optional, default false
 408          * @return array
 409          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 410          * @throws \ImagickException
 411          */
 412         public static function importProfilePhoto($image_url, $uid, $cid, $quit_on_error = false)
 413         {
 414                 $thumb = "";
 415                 $micro = "";
 416
 417                 $photo = DBA::selectFirst(
 418                         "photo", ["resource-id"], ["uid" => $uid, "contact-id" => $cid, "scale" => 4, "album" => "Contact Photos"]
 419                 );
 420                 if (!empty($photo['resource-id'])) {
 421                         $hash = $photo["resource-id"];
 422                 } else {
 423                         $hash = self::newResource();
 424                 }
 425
 426                 $photo_failure = false;
 427
 428                 $filename = basename($image_url);
 429                 if (!empty($image_url)) {
 430                         $ret = Network::curl($image_url, true);
 431                         $img_str = $ret->getBody();
 432                         $type = $ret->getContentType();
 433                 } else {
 434                         $img_str = '';
 435                 }
 436
 437                 if ($quit_on_error && ($img_str == "")) {
 438                         return false;
 439                 }
 440
 441                 if (empty($type)) {
 442                         $type = Image::guessType($image_url, true);
 443                 }
 444
 445                 $Image = new Image($img_str, $type);
 446                 if ($Image->isValid()) {
 447                         $Image->scaleToSquare(300);
 448
 449                         $r = self::store($Image, $uid, $cid, $hash, $filename, "Contact Photos", 4);
 450
 451                         if ($r === false) {
 452                                 $photo_failure = true;
 453                         }
 454
 455                         $Image->scaleDown(80);
 456
 457                         $r = self::store($Image, $uid, $cid, $hash, $filename, "Contact Photos", 5);
 458
 459                         if ($r === false) {
 460                                 $photo_failure = true;
 461                         }
 462
 463                         $Image->scaleDown(48);
 464
 465                         $r = self::store($Image, $uid, $cid, $hash, $filename, "Contact Photos", 6);
 466
 467                         if ($r === false) {
 468                                 $photo_failure = true;
 469                         }
 470
 471                         $suffix = "?ts=" . time();
 472
 473                         $image_url = System::baseUrl() . "/photo/" . $hash . "-4." . $Image->getExt() . $suffix;
 474                         $thumb = System::baseUrl() . "/photo/" . $hash . "-5." . $Image->getExt() . $suffix;
 475                         $micro = System::baseUrl() . "/photo/" . $hash . "-6." . $Image->getExt() . $suffix;
 476
 477                         // Remove the cached photo
 478                         $a = \get_app();
 479                         $basepath = $a->getBasePath();
 480
 481                         if (is_dir($basepath . "/photo")) {
 482                                 $filename = $basepath . "/photo/" . $hash . "-4." . $Image->getExt();
 483                                 if (file_exists($filename)) {
 484                                         unlink($filename);
 485                                 }
 486                                 $filename = $basepath . "/photo/" . $hash . "-5." . $Image->getExt();
 487                                 if (file_exists($filename)) {
 488                                         unlink($filename);
 489                                 }
 490                                 $filename = $basepath . "/photo/" . $hash . "-6." . $Image->getExt();
 491                                 if (file_exists($filename)) {
 492                                         unlink($filename);
 493                                 }
 494                         }
 495                 } else {
 496                         $photo_failure = true;
 497                 }
 498
 499                 if ($photo_failure && $quit_on_error) {
 500                         return false;
 501                 }
 502
 503                 if ($photo_failure) {
 504                         $image_url = System::baseUrl() . "/images/person-300.jpg";
 505                         $thumb = System::baseUrl() . "/images/person-80.jpg";
 506                         $micro = System::baseUrl() . "/images/person-48.jpg";
 507                 }
 508
 509                 return [$image_url, $thumb, $micro];
 510         }
 511
 512         /**
 513          * @param array $exifCoord coordinate
 514          * @param string $hemi      hemi
 515          * @return float
 516          */
 517         public static function getGps($exifCoord, $hemi)
 518         {
 519                 $degrees = count($exifCoord) > 0 ? self::gps2Num($exifCoord[0]) : 0;
 520                 $minutes = count($exifCoord) > 1 ? self::gps2Num($exifCoord[1]) : 0;
 521                 $seconds = count($exifCoord) > 2 ? self::gps2Num($exifCoord[2]) : 0;
 522
 523                 $flip = ($hemi == "W" || $hemi == "S") ? -1 : 1;
 524
 525                 return floatval($flip * ($degrees + ($minutes / 60) + ($seconds / 3600)));
 526         }
 527
 528         /**
 529          * @param string $coordPart coordPart
 530          * @return float
 531          */
 532         private static function gps2Num($coordPart)
 533         {
 534                 $parts = explode("/", $coordPart);
 535
 536                 if (count($parts) <= 0) {
 537                         return 0;
 538                 }
 539
 540                 if (count($parts) == 1) {
 541                         return $parts[0];
 542                 }
 543
 544                 return floatval($parts[0]) / floatval($parts[1]);
 545         }
 546
 547         /**
 548          * @brief Fetch the photo albums that are available for a viewer
 549          *
 550          * The query in this function is cost intensive, so it is cached.
 551          *
 552          * @param int  $uid    User id of the photos
 553          * @param bool $update Update the cache
 554          *
 555          * @return array Returns array of the photo albums
 556          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 557          */
 558         public static function getAlbums($uid, $update = false)
 559         {
 560                 $sql_extra = Security::getPermissionsSQLByUserId($uid);
 561
 562                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 563                 $albums = Cache::get($key);
 564                 if (is_null($albums) || $update) {
 565                         if (!Config::get("system", "no_count", false)) {
 566                                 /// @todo This query needs to be renewed. It is really slow
 567                                 // At this time we just store the data in the cache
 568                                 $albums = q("SELECT COUNT(DISTINCT `resource-id`) AS `total`, `album`, ANY_VALUE(`created`) AS `created`
 569                                         FROM `photo`
 570                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra
 571                                         GROUP BY `album` ORDER BY `created` DESC",
 572                                         intval($uid),
 573                                         DBA::escape("Contact Photos"),
 574                                         DBA::escape(L10n::t("Contact Photos"))
 575                                 );
 576                         } else {
 577                                 // This query doesn't do the count and is much faster
 578                                 $albums = q("SELECT DISTINCT(`album`), '' AS `total`
 579                                         FROM `photo` USE INDEX (`uid_album_scale_created`)
 580                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra",
 581                                         intval($uid),
 582                                         DBA::escape("Contact Photos"),
 583                                         DBA::escape(L10n::t("Contact Photos"))
 584                                 );
 585                         }
 586                         Cache::set($key, $albums, Cache::DAY);
 587                 }
 588                 return $albums;
 589         }
 590
 591         /**
 592          * @param int $uid User id of the photos
 593          * @return void
 594          * @throws \Exception
 595          */
 596         public static function clearAlbumCache($uid)
 597         {
 598                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 599                 Cache::set($key, null, Cache::DAY);
 600         }
 601
 602         /**
 603          * Generate a unique photo ID.
 604          *
 605          * @return string
 606          * @throws \Exception
 607          */
 608         public static function newResource()
 609         {
 610                 return System::createGUID(32, false);
 611         }
 612
 613         /**
 614          * Changes photo permissions that had been embedded in a post
 615          *
 616          * @todo This function currently does have some flaws:
 617          * - Sharing a post with a forum will create a photo that only the forum can see.
 618          * - Sharing a photo again that been shared non public before doesn't alter the permissions.
 619          *
 620          * @return string
 621          * @throws \Exception
 622          */
 623         public static function setPermissionFromBody($body, $uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)
 624         {
 625                 // Simplify image codes
 626                 $img_body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 627                 $img_body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $img_body);
 628
 629                 // Search for images
 630                 if (!preg_match_all("/\[img\](.*?)\[\/img\]/", $img_body, $match)) {
 631                         return false;
 632                 }
 633                 $images = $match[1];
 634                 if (empty($images)) {
 635                         return false;
 636                 }
 637
 638                 foreach ($images as $image) {
 639                         if (!stristr($image, System::baseUrl() . '/photo/')) {
 640                                 continue;
 641                         }
 642                         $image_uri = substr($image,strrpos($image,'/') + 1);
 643                         $image_uri = substr($image_uri,0, strpos($image_uri,'-'));
 644                         if (!strlen($image_uri)) {
 645                                 continue;
 646                         }
 647
 648                         // Ensure to only modify photos that you own
 649                         $srch = '<' . intval($original_contact_id) . '>';
 650
 651                         $condition = [
 652                                 'allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
 653                                 'resource-id' => $image_uri, 'uid' => $uid
 654                         ];
 655                         if (!Photo::exists($condition)) {
 656                                 continue;
 657                         }
 658
 659                         /// @todo Check if $str_contact_allow does contain a public forum. Then set the permissions to public.
 660
 661                         $fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
 662                                         'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
 663                         $condition = ['resource-id' => $image_uri, 'uid' => $uid];
 664                         Logger::info('Set permissions', ['condition' => $condition, 'permissions' => $fields]);
 665                         Photo::update($fields, $condition);
 666                 }
 667
 668                 return true;
 669         }
 670
 671         /**
 672          * Strips known picture extensions from picture links
 673          *
 674          * @param string $name Picture link
 675          * @return string stripped picture link
 676          * @throws \Exception
 677          */
 678         public static function stripExtension($name)
 679         {
 680                 $name = str_replace([".jpg", ".png", ".gif"], ["", "", ""], $name);
 681                 foreach (Image::supportedTypes() as $m => $e) {
 682                         $name = str_replace("." . $e, "", $name);
 683                 }
 684                 return $name;
 685         }
 686
 687         /**
 688          * Returns the GUID from picture links
 689          *
 690          * @param string $name Picture link
 691          * @return string GUID
 692          * @throws \Exception
 693          */
 694         public static function getGUID($name)
 695         {
 696                 $a = \get_app();
 697                 $base = $a->getBaseURL();
 698
 699                 $guid = str_replace([Strings::normaliseLink($base), '/photo/'], '', Strings::normaliseLink($name));
 700
 701                 $guid = self::stripExtension($guid);
 702                 if (substr($guid, -2, 1) != "-") {
 703                         return '';
 704                 }
 705
 706                 $scale = intval(substr($guid, -1, 1));
 707                 if (empty($scale)) {
 708                         return '';
 709                 }
 710
 711                 $guid = substr($guid, 0, -2);
 712                 return $guid;
 713         }
 714
 715         /**
 716          * Tests if the picture link points to a locally stored picture
 717          *
 718          * @param string $name Picture link
 719          * @return boolean
 720          * @throws \Exception
 721          */
 722         public static function isLocal($name)
 723         {
 724                 $guid = self::getGUID($name);
 725
 726                 if (empty($guid)) {
 727                         return false;
 728                 }
 729
 730                 return DBA::exists('photo', ['resource-id' => $guid]);
 731         }
 732 }