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\Core\Cache;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\L10n;
  12 use Friendica\Core\Logger;
  13 use Friendica\Core\StorageManager;
  14 use Friendica\Core\System;
  15 use Friendica\Database\DBA;
  16 use Friendica\Database\DBStructure;
  17 use Friendica\DI;
  18 use Friendica\Model\Storage\IStorage;
  19 use Friendica\Object\Image;
  20 use Friendica\Util\DateTimeFormat;
  21 use Friendica\Util\Images;
  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
  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"], ["resource-id" => $resourceid]);
 135                 if (!DBA::isResult($r)) {
 136                         return false;
 137                 }
 138
 139                 $uid = $r["uid"];
 140
 141                 $sql_acl = Security::getPermissionsSQLByUserId($uid);
 142
 143                 $conditions = ["`resource-id` = ? AND `scale` <= ? " . $sql_acl, $resourceid, $scale];
 144                 $params = ["order" => ["scale" => true]];
 145                 $photo = self::selectFirst([], $conditions, $params);
 146
 147                 return $photo;
 148         }
 149
 150         /**
 151          * @brief Check if photo with given conditions exists
 152          *
 153          * @param array $conditions Array of extra conditions
 154          *
 155          * @return boolean
 156          * @throws \Exception
 157          */
 158         public static function exists(array $conditions)
 159         {
 160                 return DBA::exists("photo", $conditions);
 161         }
 162
 163
 164         /**
 165          * @brief Get Image object for given row id. null if row id does not exist
 166          *
 167          * @param array $photo Photo data. Needs at least 'id', 'type', 'backend-class', 'backend-ref'
 168          *
 169          * @return \Friendica\Object\Image
 170          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 171          * @throws \ImagickException
 172          */
 173         public static function getImageForPhoto(array $photo)
 174         {
 175                 $data = "";
 176
 177                 if ($photo["backend-class"] == "") {
 178                         // legacy data storage in "data" column
 179                         $i = self::selectFirst(["data"], ["id" => $photo["id"]]);
 180                         if ($i === false) {
 181                                 return null;
 182                         }
 183                         $data = $i["data"];
 184                 } else {
 185                         $backendClass = $photo["backend-class"];
 186                         $backendRef = $photo["backend-ref"];
 187                         $data = $backendClass::get($backendRef);
 188                 }
 189
 190                 if ($data === "") {
 191                         return null;
 192                 }
 193
 194                 return new Image($data, $photo["type"]);
 195         }
 196
 197         /**
 198          * @brief Return a list of fields that are associated with the photo table
 199          *
 200          * @return array field list
 201          * @throws \Exception
 202          */
 203         private static function getFields()
 204         {
 205                 $allfields = DBStructure::definition(DI::app()->getBasePath(), false);
 206                 $fields = array_keys($allfields["photo"]["fields"]);
 207                 array_splice($fields, array_search("data", $fields), 1);
 208                 return $fields;
 209         }
 210
 211         /**
 212          * @brief Construct a photo array for a system resource image
 213          *
 214          * @param string $filename Image file name relative to code root
 215          * @param string $mimetype Image mime type. Defaults to "image/jpeg"
 216          *
 217          * @return array
 218          * @throws \Exception
 219          */
 220         public static function createPhotoForSystemResource($filename, $mimetype = "image/jpeg")
 221         {
 222                 $fields = self::getFields();
 223                 $values = array_fill(0, count($fields), "");
 224
 225                 $photo = array_combine($fields, $values);
 226                 $photo["backend-class"] = Storage\SystemResource::class;
 227                 $photo["backend-ref"] = $filename;
 228                 $photo["type"] = $mimetype;
 229                 $photo["cacheable"] = false;
 230
 231                 return $photo;
 232         }
 233
 234
 235         /**
 236          * @brief store photo metadata in db and binary in default backend
 237          *
 238          * @param Image   $Image     Image object with data
 239          * @param integer $uid       User ID
 240          * @param integer $cid       Contact ID
 241          * @param integer $rid       Resource ID
 242          * @param string  $filename  Filename
 243          * @param string  $album     Album name
 244          * @param integer $scale     Scale
 245          * @param integer $profile   Is a profile image? optional, default = 0
 246          * @param string  $allow_cid Permissions, allowed contacts. optional, default = ""
 247          * @param string  $allow_gid Permissions, allowed groups. optional, default = ""
 248          * @param string  $deny_cid  Permissions, denied contacts.optional, default = ""
 249          * @param string  $deny_gid  Permissions, denied greoup.optional, default = ""
 250          * @param string  $desc      Photo caption. optional, default = ""
 251          *
 252          * @return boolean True on success
 253          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 254          */
 255         public static function store(Image $Image, $uid, $cid, $rid, $filename, $album, $scale, $profile = 0, $allow_cid = "", $allow_gid = "", $deny_cid = "", $deny_gid = "", $desc = "")
 256         {
 257                 $photo = self::selectFirst(["guid"], ["`resource-id` = ? AND `guid` != ?", $rid, ""]);
 258                 if (DBA::isResult($photo)) {
 259                         $guid = $photo["guid"];
 260                 } else {
 261                         $guid = System::createGUID();
 262                 }
 263
 264                 $existing_photo = self::selectFirst(["id", "created", "backend-class", "backend-ref"], ["resource-id" => $rid, "uid" => $uid, "contact-id" => $cid, "scale" => $scale]);
 265                 $created = DateTimeFormat::utcNow();
 266                 if (DBA::isResult($existing_photo)) {
 267                         $created = $existing_photo["created"];
 268                 }
 269
 270                 // Get defined storage backend.
 271                 // if no storage backend, we use old "data" column in photo table.
 272                 // if is an existing photo, reuse same backend
 273                 $data = "";
 274                 $backend_ref = "";
 275
 276                 if (DBA::isResult($existing_photo)) {
 277                         $backend_ref = (string)$existing_photo["backend-ref"];
 278                         $storage = DI::facStorage()->getByName((string)$existing_photo["backend-class"]);
 279                 } else {
 280                         $storage = DI::storage();
 281                 }
 282
 283                 if ($storage === null) {
 284                         $data = $Image->asString();
 285                 } else {
 286                         $backend_ref = $storage->put($Image->asString(), $backend_ref);
 287                 }
 288
 289
 290                 $fields = [
 291                         "uid" => $uid,
 292                         "contact-id" => $cid,
 293                         "guid" => $guid,
 294                         "resource-id" => $rid,
 295                         "created" => $created,
 296                         "edited" => DateTimeFormat::utcNow(),
 297                         "filename" => basename($filename),
 298                         "type" => $Image->getType(),
 299                         "album" => $album,
 300                         "height" => $Image->getHeight(),
 301                         "width" => $Image->getWidth(),
 302                         "datasize" => strlen($Image->asString()),
 303                         "data" => $data,
 304                         "scale" => $scale,
 305                         "profile" => $profile,
 306                         "allow_cid" => $allow_cid,
 307                         "allow_gid" => $allow_gid,
 308                         "deny_cid" => $deny_cid,
 309                         "deny_gid" => $deny_gid,
 310                         "desc" => $desc,
 311                         "backend-class" => (string)$storage,
 312                         "backend-ref" => $backend_ref
 313                 ];
 314
 315                 if (DBA::isResult($existing_photo)) {
 316                         $r = DBA::update("photo", $fields, ["id" => $existing_photo["id"]]);
 317                 } else {
 318                         $r = DBA::insert("photo", $fields);
 319                 }
 320
 321                 return $r;
 322         }
 323
 324
 325         /**
 326          * @brief Delete info from table and data from storage
 327          *
 328          * @param array $conditions Field condition(s)
 329          * @param array $options    Options array, Optional
 330          *
 331          * @return boolean
 332          *
 333          * @throws \Exception
 334          * @see   \Friendica\Database\DBA::delete
 335          */
 336         public static function delete(array $conditions, array $options = [])
 337         {
 338                 // get photo to delete data info
 339                 $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 340
 341                 foreach($photos as $photo) {
 342                         /** @var IStorage $backend_class */
 343                         $backend_class = (string)$photo["backend-class"];
 344                         if ($backend_class !== "") {
 345                                 $backend_class::delete($photo["backend-ref"]);
 346                         }
 347                 }
 348
 349                 return DBA::delete("photo", $conditions, $options);
 350         }
 351
 352         /**
 353          * @brief Update a photo
 354          *
 355          * @param array         $fields     Contains the fields that are updated
 356          * @param array         $conditions Condition array with the key values
 357          * @param Image         $img        Image to update. Optional, default null.
 358          * @param array|boolean $old_fields Array with the old field values that are about to be replaced (true = update on duplicate)
 359          *
 360          * @return boolean  Was the update successfull?
 361          *
 362          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 363          * @see   \Friendica\Database\DBA::update
 364          */
 365         public static function update($fields, $conditions, Image $img = null, array $old_fields = [])
 366         {
 367                 if (!is_null($img)) {
 368                         // get photo to update
 369                         $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 370
 371                         foreach($photos as $photo) {
 372                                 /** @var IStorage $backend_class */
 373                                 $backend_class = (string)$photo["backend-class"];
 374                                 if ($backend_class !== "") {
 375                                         $fields["backend-ref"] = $backend_class::put($img->asString(), $photo["backend-ref"]);
 376                                 } else {
 377                                         $fields["data"] = $img->asString();
 378                                 }
 379                         }
 380                         $fields['updated'] = DateTimeFormat::utcNow();
 381                 }
 382
 383                 $fields['edited'] = DateTimeFormat::utcNow();
 384
 385                 return DBA::update("photo", $fields, $conditions, $old_fields);
 386         }
 387
 388         /**
 389          * @param string  $image_url     Remote URL
 390          * @param integer $uid           user id
 391          * @param integer $cid           contact id
 392          * @param boolean $quit_on_error optional, default false
 393          * @return array
 394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 395          * @throws \ImagickException
 396          */
 397         public static function importProfilePhoto($image_url, $uid, $cid, $quit_on_error = false)
 398         {
 399                 $thumb = "";
 400                 $micro = "";
 401
 402                 $photo = DBA::selectFirst(
 403                         "photo", ["resource-id"], ["uid" => $uid, "contact-id" => $cid, "scale" => 4, "album" => "Contact Photos"]
 404                 );
 405                 if (!empty($photo['resource-id'])) {
 406                         $resource_id = $photo["resource-id"];
 407                 } else {
 408                         $resource_id = self::newResource();
 409                 }
 410
 411                 $photo_failure = false;
 412
 413                 $filename = basename($image_url);
 414                 if (!empty($image_url)) {
 415                         $ret = Network::curl($image_url, true);
 416                         $img_str = $ret->getBody();
 417                         $type = $ret->getContentType();
 418                 } else {
 419                         $img_str = '';
 420                 }
 421
 422                 if ($quit_on_error && ($img_str == "")) {
 423                         return false;
 424                 }
 425
 426                 if (empty($type)) {
 427                         $type = Images::guessType($image_url, true);
 428                 }
 429
 430                 $Image = new Image($img_str, $type);
 431                 if ($Image->isValid()) {
 432                         $Image->scaleToSquare(300);
 433
 434                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 4);
 435
 436                         if ($r === false) {
 437                                 $photo_failure = true;
 438                         }
 439
 440                         $Image->scaleDown(80);
 441
 442                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 5);
 443
 444                         if ($r === false) {
 445                                 $photo_failure = true;
 446                         }
 447
 448                         $Image->scaleDown(48);
 449
 450                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 6);
 451
 452                         if ($r === false) {
 453                                 $photo_failure = true;
 454                         }
 455
 456                         $suffix = "?ts=" . time();
 457
 458                         $image_url = DI::baseUrl() . "/photo/" . $resource_id . "-4." . $Image->getExt() . $suffix;
 459                         $thumb = DI::baseUrl() . "/photo/" . $resource_id . "-5." . $Image->getExt() . $suffix;
 460                         $micro = DI::baseUrl() . "/photo/" . $resource_id . "-6." . $Image->getExt() . $suffix;
 461
 462                         // Remove the cached photo
 463                         $a = DI::app();
 464                         $basepath = $a->getBasePath();
 465
 466                         if (is_dir($basepath . "/photo")) {
 467                                 $filename = $basepath . "/photo/" . $resource_id . "-4." . $Image->getExt();
 468                                 if (file_exists($filename)) {
 469                                         unlink($filename);
 470                                 }
 471                                 $filename = $basepath . "/photo/" . $resource_id . "-5." . $Image->getExt();
 472                                 if (file_exists($filename)) {
 473                                         unlink($filename);
 474                                 }
 475                                 $filename = $basepath . "/photo/" . $resource_id . "-6." . $Image->getExt();
 476                                 if (file_exists($filename)) {
 477                                         unlink($filename);
 478                                 }
 479                         }
 480                 } else {
 481                         $photo_failure = true;
 482                 }
 483
 484                 if ($photo_failure && $quit_on_error) {
 485                         return false;
 486                 }
 487
 488                 if ($photo_failure) {
 489                         $image_url = DI::baseUrl() . "/images/person-300.jpg";
 490                         $thumb = DI::baseUrl() . "/images/person-80.jpg";
 491                         $micro = DI::baseUrl() . "/images/person-48.jpg";
 492                 }
 493
 494                 return [$image_url, $thumb, $micro];
 495         }
 496
 497         /**
 498          * @param array $exifCoord coordinate
 499          * @param string $hemi      hemi
 500          * @return float
 501          */
 502         public static function getGps($exifCoord, $hemi)
 503         {
 504                 $degrees = count($exifCoord) > 0 ? self::gps2Num($exifCoord[0]) : 0;
 505                 $minutes = count($exifCoord) > 1 ? self::gps2Num($exifCoord[1]) : 0;
 506                 $seconds = count($exifCoord) > 2 ? self::gps2Num($exifCoord[2]) : 0;
 507
 508                 $flip = ($hemi == "W" || $hemi == "S") ? -1 : 1;
 509
 510                 return floatval($flip * ($degrees + ($minutes / 60) + ($seconds / 3600)));
 511         }
 512
 513         /**
 514          * @param string $coordPart coordPart
 515          * @return float
 516          */
 517         private static function gps2Num($coordPart)
 518         {
 519                 $parts = explode("/", $coordPart);
 520
 521                 if (count($parts) <= 0) {
 522                         return 0;
 523                 }
 524
 525                 if (count($parts) == 1) {
 526                         return $parts[0];
 527                 }
 528
 529                 return floatval($parts[0]) / floatval($parts[1]);
 530         }
 531
 532         /**
 533          * @brief Fetch the photo albums that are available for a viewer
 534          *
 535          * The query in this function is cost intensive, so it is cached.
 536          *
 537          * @param int  $uid    User id of the photos
 538          * @param bool $update Update the cache
 539          *
 540          * @return array Returns array of the photo albums
 541          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 542          */
 543         public static function getAlbums($uid, $update = false)
 544         {
 545                 $sql_extra = Security::getPermissionsSQLByUserId($uid);
 546
 547                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 548                 $albums = Cache::get($key);
 549                 if (is_null($albums) || $update) {
 550                         if (!Config::get("system", "no_count", false)) {
 551                                 /// @todo This query needs to be renewed. It is really slow
 552                                 // At this time we just store the data in the cache
 553                                 $albums = q("SELECT COUNT(DISTINCT `resource-id`) AS `total`, `album`, ANY_VALUE(`created`) AS `created`
 554                                         FROM `photo`
 555                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra
 556                                         GROUP BY `album` ORDER BY `created` DESC",
 557                                         intval($uid),
 558                                         DBA::escape("Contact Photos"),
 559                                         DBA::escape(L10n::t("Contact Photos"))
 560                                 );
 561                         } else {
 562                                 // This query doesn't do the count and is much faster
 563                                 $albums = q("SELECT DISTINCT(`album`), '' AS `total`
 564                                         FROM `photo` USE INDEX (`uid_album_scale_created`)
 565                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra",
 566                                         intval($uid),
 567                                         DBA::escape("Contact Photos"),
 568                                         DBA::escape(L10n::t("Contact Photos"))
 569                                 );
 570                         }
 571                         Cache::set($key, $albums, Cache::DAY);
 572                 }
 573                 return $albums;
 574         }
 575
 576         /**
 577          * @param int $uid User id of the photos
 578          * @return void
 579          * @throws \Exception
 580          */
 581         public static function clearAlbumCache($uid)
 582         {
 583                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 584                 Cache::set($key, null, Cache::DAY);
 585         }
 586
 587         /**
 588          * Generate a unique photo ID.
 589          *
 590          * @return string
 591          * @throws \Exception
 592          */
 593         public static function newResource()
 594         {
 595                 return System::createGUID(32, false);
 596         }
 597
 598         /**
 599          * Changes photo permissions that had been embedded in a post
 600          *
 601          * @todo This function currently does have some flaws:
 602          * - Sharing a post with a forum will create a photo that only the forum can see.
 603          * - Sharing a photo again that been shared non public before doesn't alter the permissions.
 604          *
 605          * @return string
 606          * @throws \Exception
 607          */
 608         public static function setPermissionFromBody($body, $uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)
 609         {
 610                 // Simplify image codes
 611                 $img_body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 612                 $img_body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $img_body);
 613
 614                 // Search for images
 615                 if (!preg_match_all("/\[img\](.*?)\[\/img\]/", $img_body, $match)) {
 616                         return false;
 617                 }
 618                 $images = $match[1];
 619                 if (empty($images)) {
 620                         return false;
 621                 }
 622
 623                 foreach ($images as $image) {
 624                         if (!stristr($image, DI::baseUrl() . '/photo/')) {
 625                                 continue;
 626                         }
 627                         $image_uri = substr($image,strrpos($image,'/') + 1);
 628                         $image_uri = substr($image_uri,0, strpos($image_uri,'-'));
 629                         if (!strlen($image_uri)) {
 630                                 continue;
 631                         }
 632
 633                         // Ensure to only modify photos that you own
 634                         $srch = '<' . intval($original_contact_id) . '>';
 635
 636                         $condition = [
 637                                 'allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
 638                                 'resource-id' => $image_uri, 'uid' => $uid
 639                         ];
 640                         if (!Photo::exists($condition)) {
 641                                 continue;
 642                         }
 643
 644                         /// @todo Check if $str_contact_allow does contain a public forum. Then set the permissions to public.
 645
 646                         $fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
 647                                         'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
 648                         $condition = ['resource-id' => $image_uri, 'uid' => $uid];
 649                         Logger::info('Set permissions', ['condition' => $condition, 'permissions' => $fields]);
 650                         Photo::update($fields, $condition);
 651                 }
 652
 653                 return true;
 654         }
 655
 656         /**
 657          * Strips known picture extensions from picture links
 658          *
 659          * @param string $name Picture link
 660          * @return string stripped picture link
 661          * @throws \Exception
 662          */
 663         public static function stripExtension($name)
 664         {
 665                 $name = str_replace([".jpg", ".png", ".gif"], ["", "", ""], $name);
 666                 foreach (Images::supportedTypes() as $m => $e) {
 667                         $name = str_replace("." . $e, "", $name);
 668                 }
 669                 return $name;
 670         }
 671
 672         /**
 673          * Returns the GUID from picture links
 674          *
 675          * @param string $name Picture link
 676          * @return string GUID
 677          * @throws \Exception
 678          */
 679         public static function getGUID($name)
 680         {
 681                 $base = DI::baseUrl()->get();
 682
 683                 $guid = str_replace([Strings::normaliseLink($base), '/photo/'], '', Strings::normaliseLink($name));
 684
 685                 $guid = self::stripExtension($guid);
 686                 if (substr($guid, -2, 1) != "-") {
 687                         return '';
 688                 }
 689
 690                 $scale = intval(substr($guid, -1, 1));
 691                 if (!is_numeric($scale)) {
 692                         return '';
 693                 }
 694
 695                 $guid = substr($guid, 0, -2);
 696                 return $guid;
 697         }
 698
 699         /**
 700          * Tests if the picture link points to a locally stored picture
 701          *
 702          * @param string $name Picture link
 703          * @return boolean
 704          * @throws \Exception
 705          */
 706         public static function isLocal($name)
 707         {
 708                 $guid = self::getGUID($name);
 709
 710                 if (empty($guid)) {
 711                         return false;
 712                 }
 713
 714                 return DBA::exists('photo', ['resource-id' => $guid]);
 715         }
 716
 717         /**
 718          * Tests if the link points to a locally stored picture page
 719          *
 720          * @param string $name Page link
 721          * @return boolean
 722          * @throws \Exception
 723          */
 724         public static function isLocalPage($name)
 725         {
 726                 $base = DI::baseUrl()->get();
 727
 728                 $guid = str_replace(Strings::normaliseLink($base), '', Strings::normaliseLink($name));
 729                 $guid = preg_replace("=/photos/.*/image/(.*)=ism", '$1', $guid);
 730                 if (empty($guid)) {
 731                         return false;
 732                 }
 733
 734                 return DBA::exists('photo', ['resource-id' => $guid]);
 735         }
 736 }