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\DI;
  19 use Friendica\Model\Storage\IStorage;
  20 use Friendica\Object\Image;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Util\Images;
  23 use Friendica\Util\Network;
  24 use Friendica\Util\Security;
  25 use Friendica\Util\Strings;
  26
  27 require_once "include/dba.php";
  28
  29 /**
  30  * Class to handle photo dabatase table
  31  */
  32 class Photo extends BaseObject
  33 {
  34         /**
  35          * @brief Select rows from the photo table and returns them as array
  36          *
  37          * @param array $fields     Array of selected fields, empty for all
  38          * @param array $conditions Array of fields for conditions
  39          * @param array $params     Array of several parameters
  40          *
  41          * @return boolean|array
  42          *
  43          * @throws \Exception
  44          * @see   \Friendica\Database\DBA::selectToArray
  45          */
  46         public static function selectToArray(array $fields = [], array $conditions = [], array $params = [])
  47         {
  48                 if (empty($fields)) {
  49                         $fields = self::getFields();
  50                 }
  51
  52                 return DBA::selectToArray('photo', $fields, $conditions, $params);
  53         }
  54
  55         /**
  56          * @brief Retrieve a single record from the photo table
  57          *
  58          * @param array $fields     Array of selected fields, empty for all
  59          * @param array $conditions Array of fields for conditions
  60          * @param array $params     Array of several parameters
  61          *
  62          * @return bool|array
  63          *
  64          * @throws \Exception
  65          * @see   \Friendica\Database\DBA::select
  66          */
  67         public static function selectFirst(array $fields = [], array $conditions = [], array $params = [])
  68         {
  69                 if (empty($fields)) {
  70                         $fields = self::getFields();
  71                 }
  72
  73                 return DBA::selectFirst("photo", $fields, $conditions, $params);
  74         }
  75
  76         /**
  77          * @brief Get photos for user id
  78          *
  79          * @param integer $uid        User id
  80          * @param string  $resourceid Rescource ID of the photo
  81          * @param array   $conditions Array of fields for conditions
  82          * @param array   $params     Array of several parameters
  83          *
  84          * @return bool|array
  85          *
  86          * @throws \Exception
  87          * @see   \Friendica\Database\DBA::select
  88          */
  89         public static function getPhotosForUser($uid, $resourceid, array $conditions = [], array $params = [])
  90         {
  91                 $conditions["resource-id"] = $resourceid;
  92                 $conditions["uid"] = $uid;
  93
  94                 return self::selectToArray([], $conditions, $params);
  95         }
  96
  97         /**
  98          * @brief Get a photo for user id
  99          *
 100          * @param integer $uid        User id
 101          * @param string  $resourceid Rescource ID of the photo
 102          * @param integer $scale      Scale of the photo. Defaults to 0
 103          * @param array   $conditions Array of fields for conditions
 104          * @param array   $params     Array of several parameters
 105          *
 106          * @return bool|array
 107          *
 108          * @throws \Exception
 109          * @see   \Friendica\Database\DBA::select
 110          */
 111         public static function getPhotoForUser($uid, $resourceid, $scale = 0, array $conditions = [], array $params = [])
 112         {
 113                 $conditions["resource-id"] = $resourceid;
 114                 $conditions["uid"] = $uid;
 115                 $conditions["scale"] = $scale;
 116
 117                 return self::selectFirst([], $conditions, $params);
 118         }
 119
 120         /**
 121          * @brief Get a single photo given resource id and scale
 122          *
 123          * This method checks for permissions. Returns associative array
 124          * on success, "no sign" image info, if user has no permission,
 125          * false if photo does not exists
 126          *
 127          * @param string  $resourceid Rescource ID of the photo
 128          * @param integer $scale      Scale of the photo. Defaults to 0
 129          *
 130          * @return boolean|array
 131          * @throws \Exception
 132          */
 133         public static function getPhoto($resourceid, $scale = 0)
 134         {
 135                 $r = self::selectFirst(["uid"], ["resource-id" => $resourceid]);
 136                 if (!DBA::isResult($r)) {
 137                         return false;
 138                 }
 139
 140                 $uid = $r["uid"];
 141
 142                 $sql_acl = Security::getPermissionsSQLByUserId($uid);
 143
 144                 $conditions = ["`resource-id` = ? AND `scale` <= ? " . $sql_acl, $resourceid, $scale];
 145                 $params = ["order" => ["scale" => true]];
 146                 $photo = self::selectFirst([], $conditions, $params);
 147
 148                 return $photo;
 149         }
 150
 151         /**
 152          * @brief Check if photo with given conditions exists
 153          *
 154          * @param array $conditions Array of extra conditions
 155          *
 156          * @return boolean
 157          * @throws \Exception
 158          */
 159         public static function exists(array $conditions)
 160         {
 161                 return DBA::exists("photo", $conditions);
 162         }
 163
 164
 165         /**
 166          * @brief Get Image object for given row id. null if row id does not exist
 167          *
 168          * @param array $photo Photo data. Needs at least 'id', 'type', 'backend-class', 'backend-ref'
 169          *
 170          * @return \Friendica\Object\Image
 171          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 172          * @throws \ImagickException
 173          */
 174         public static function getImageForPhoto(array $photo)
 175         {
 176                 $data = "";
 177
 178                 if ($photo["backend-class"] == "") {
 179                         // legacy data storage in "data" column
 180                         $i = self::selectFirst(["data"], ["id" => $photo["id"]]);
 181                         if ($i === false) {
 182                                 return null;
 183                         }
 184                         $data = $i["data"];
 185                 } else {
 186                         $backendClass = $photo["backend-class"];
 187                         $backendRef = $photo["backend-ref"];
 188                         $data = $backendClass::get($backendRef);
 189                 }
 190
 191                 if ($data === "") {
 192                         return null;
 193                 }
 194
 195                 return new Image($data, $photo["type"]);
 196         }
 197
 198         /**
 199          * @brief Return a list of fields that are associated with the photo table
 200          *
 201          * @return array field list
 202          * @throws \Exception
 203          */
 204         private static function getFields()
 205         {
 206                 $allfields = DBStructure::definition(DI::app()->getBasePath(), false);
 207                 $fields = array_keys($allfields["photo"]["fields"]);
 208                 array_splice($fields, array_search("data", $fields), 1);
 209                 return $fields;
 210         }
 211
 212         /**
 213          * @brief Construct a photo array for a system resource image
 214          *
 215          * @param string $filename Image file name relative to code root
 216          * @param string $mimetype Image mime type. Defaults to "image/jpeg"
 217          *
 218          * @return array
 219          * @throws \Exception
 220          */
 221         public static function createPhotoForSystemResource($filename, $mimetype = "image/jpeg")
 222         {
 223                 $fields = self::getFields();
 224                 $values = array_fill(0, count($fields), "");
 225
 226                 $photo = array_combine($fields, $values);
 227                 $photo["backend-class"] = Storage\SystemResource::class;
 228                 $photo["backend-ref"] = $filename;
 229                 $photo["type"] = $mimetype;
 230                 $photo["cacheable"] = false;
 231
 232                 return $photo;
 233         }
 234
 235
 236         /**
 237          * @brief store photo metadata in db and binary in default backend
 238          *
 239          * @param Image   $Image     Image object with data
 240          * @param integer $uid       User ID
 241          * @param integer $cid       Contact ID
 242          * @param integer $rid       Resource ID
 243          * @param string  $filename  Filename
 244          * @param string  $album     Album name
 245          * @param integer $scale     Scale
 246          * @param integer $profile   Is a profile image? optional, default = 0
 247          * @param string  $allow_cid Permissions, allowed contacts. optional, default = ""
 248          * @param string  $allow_gid Permissions, allowed groups. optional, default = ""
 249          * @param string  $deny_cid  Permissions, denied contacts.optional, default = ""
 250          * @param string  $deny_gid  Permissions, denied greoup.optional, default = ""
 251          * @param string  $desc      Photo caption. optional, default = ""
 252          *
 253          * @return boolean True on success
 254          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 255          */
 256         public static function store(Image $Image, $uid, $cid, $rid, $filename, $album, $scale, $profile = 0, $allow_cid = "", $allow_gid = "", $deny_cid = "", $deny_gid = "", $desc = "")
 257         {
 258                 $photo = self::selectFirst(["guid"], ["`resource-id` = ? AND `guid` != ?", $rid, ""]);
 259                 if (DBA::isResult($photo)) {
 260                         $guid = $photo["guid"];
 261                 } else {
 262                         $guid = System::createGUID();
 263                 }
 264
 265                 $existing_photo = self::selectFirst(["id", "created", "backend-class", "backend-ref"], ["resource-id" => $rid, "uid" => $uid, "contact-id" => $cid, "scale" => $scale]);
 266                 $created = DateTimeFormat::utcNow();
 267                 if (DBA::isResult($existing_photo)) {
 268                         $created = $existing_photo["created"];
 269                 }
 270
 271                 // Get defined storage backend.
 272                 // if no storage backend, we use old "data" column in photo table.
 273                 // if is an existing photo, reuse same backend
 274                 $data = "";
 275                 $backend_ref = "";
 276
 277                 /** @var IStorage $backend_class */
 278                 if (DBA::isResult($existing_photo)) {
 279                         $backend_ref = (string)$existing_photo["backend-ref"];
 280                         $backend_class = (string)$existing_photo["backend-class"];
 281                 } else {
 282                         $backend_class = StorageManager::getBackend();
 283                 }
 284
 285                 if ($backend_class === "") {
 286                         $data = $Image->asString();
 287                 } else {
 288                         $backend_ref = $backend_class::put($Image->asString(), $backend_ref);
 289                 }
 290
 291
 292                 $fields = [
 293                         "uid" => $uid,
 294                         "contact-id" => $cid,
 295                         "guid" => $guid,
 296                         "resource-id" => $rid,
 297                         "created" => $created,
 298                         "edited" => DateTimeFormat::utcNow(),
 299                         "filename" => basename($filename),
 300                         "type" => $Image->getType(),
 301                         "album" => $album,
 302                         "height" => $Image->getHeight(),
 303                         "width" => $Image->getWidth(),
 304                         "datasize" => strlen($Image->asString()),
 305                         "data" => $data,
 306                         "scale" => $scale,
 307                         "profile" => $profile,
 308                         "allow_cid" => $allow_cid,
 309                         "allow_gid" => $allow_gid,
 310                         "deny_cid" => $deny_cid,
 311                         "deny_gid" => $deny_gid,
 312                         "desc" => $desc,
 313                         "backend-class" => $backend_class,
 314                         "backend-ref" => $backend_ref
 315                 ];
 316
 317                 if (DBA::isResult($existing_photo)) {
 318                         $r = DBA::update("photo", $fields, ["id" => $existing_photo["id"]]);
 319                 } else {
 320                         $r = DBA::insert("photo", $fields);
 321                 }
 322
 323                 return $r;
 324         }
 325
 326
 327         /**
 328          * @brief Delete info from table and data from storage
 329          *
 330          * @param array $conditions Field condition(s)
 331          * @param array $options    Options array, Optional
 332          *
 333          * @return boolean
 334          *
 335          * @throws \Exception
 336          * @see   \Friendica\Database\DBA::delete
 337          */
 338         public static function delete(array $conditions, array $options = [])
 339         {
 340                 // get photo to delete data info
 341                 $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 342
 343                 foreach($photos as $photo) {
 344                         /** @var IStorage $backend_class */
 345                         $backend_class = (string)$photo["backend-class"];
 346                         if ($backend_class !== "") {
 347                                 $backend_class::delete($photo["backend-ref"]);
 348                         }
 349                 }
 350
 351                 return DBA::delete("photo", $conditions, $options);
 352         }
 353
 354         /**
 355          * @brief Update a photo
 356          *
 357          * @param array         $fields     Contains the fields that are updated
 358          * @param array         $conditions Condition array with the key values
 359          * @param Image         $img        Image to update. Optional, default null.
 360          * @param array|boolean $old_fields Array with the old field values that are about to be replaced (true = update on duplicate)
 361          *
 362          * @return boolean  Was the update successfull?
 363          *
 364          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 365          * @see   \Friendica\Database\DBA::update
 366          */
 367         public static function update($fields, $conditions, Image $img = null, array $old_fields = [])
 368         {
 369                 if (!is_null($img)) {
 370                         // get photo to update
 371                         $photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 372
 373                         foreach($photos as $photo) {
 374                                 /** @var IStorage $backend_class */
 375                                 $backend_class = (string)$photo["backend-class"];
 376                                 if ($backend_class !== "") {
 377                                         $fields["backend-ref"] = $backend_class::put($img->asString(), $photo["backend-ref"]);
 378                                 } else {
 379                                         $fields["data"] = $img->asString();
 380                                 }
 381                         }
 382                         $fields['updated'] = DateTimeFormat::utcNow();
 383                 }
 384
 385                 $fields['edited'] = DateTimeFormat::utcNow();
 386
 387                 return DBA::update("photo", $fields, $conditions, $old_fields);
 388         }
 389
 390         /**
 391          * @param string  $image_url     Remote URL
 392          * @param integer $uid           user id
 393          * @param integer $cid           contact id
 394          * @param boolean $quit_on_error optional, default false
 395          * @return array
 396          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 397          * @throws \ImagickException
 398          */
 399         public static function importProfilePhoto($image_url, $uid, $cid, $quit_on_error = false)
 400         {
 401                 $thumb = "";
 402                 $micro = "";
 403
 404                 $photo = DBA::selectFirst(
 405                         "photo", ["resource-id"], ["uid" => $uid, "contact-id" => $cid, "scale" => 4, "album" => "Contact Photos"]
 406                 );
 407                 if (!empty($photo['resource-id'])) {
 408                         $resource_id = $photo["resource-id"];
 409                 } else {
 410                         $resource_id = self::newResource();
 411                 }
 412
 413                 $photo_failure = false;
 414
 415                 $filename = basename($image_url);
 416                 if (!empty($image_url)) {
 417                         $ret = Network::curl($image_url, true);
 418                         $img_str = $ret->getBody();
 419                         $type = $ret->getContentType();
 420                 } else {
 421                         $img_str = '';
 422                 }
 423
 424                 if ($quit_on_error && ($img_str == "")) {
 425                         return false;
 426                 }
 427
 428                 if (empty($type)) {
 429                         $type = Images::guessType($image_url, true);
 430                 }
 431
 432                 $Image = new Image($img_str, $type);
 433                 if ($Image->isValid()) {
 434                         $Image->scaleToSquare(300);
 435
 436                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 4);
 437
 438                         if ($r === false) {
 439                                 $photo_failure = true;
 440                         }
 441
 442                         $Image->scaleDown(80);
 443
 444                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 5);
 445
 446                         if ($r === false) {
 447                                 $photo_failure = true;
 448                         }
 449
 450                         $Image->scaleDown(48);
 451
 452                         $r = self::store($Image, $uid, $cid, $resource_id, $filename, "Contact Photos", 6);
 453
 454                         if ($r === false) {
 455                                 $photo_failure = true;
 456                         }
 457
 458                         $suffix = "?ts=" . time();
 459
 460                         $image_url = System::baseUrl() . "/photo/" . $resource_id . "-4." . $Image->getExt() . $suffix;
 461                         $thumb = System::baseUrl() . "/photo/" . $resource_id . "-5." . $Image->getExt() . $suffix;
 462                         $micro = System::baseUrl() . "/photo/" . $resource_id . "-6." . $Image->getExt() . $suffix;
 463
 464                         // Remove the cached photo
 465                         $a = \get_app();
 466                         $basepath = $a->getBasePath();
 467
 468                         if (is_dir($basepath . "/photo")) {
 469                                 $filename = $basepath . "/photo/" . $resource_id . "-4." . $Image->getExt();
 470                                 if (file_exists($filename)) {
 471                                         unlink($filename);
 472                                 }
 473                                 $filename = $basepath . "/photo/" . $resource_id . "-5." . $Image->getExt();
 474                                 if (file_exists($filename)) {
 475                                         unlink($filename);
 476                                 }
 477                                 $filename = $basepath . "/photo/" . $resource_id . "-6." . $Image->getExt();
 478                                 if (file_exists($filename)) {
 479                                         unlink($filename);
 480                                 }
 481                         }
 482                 } else {
 483                         $photo_failure = true;
 484                 }
 485
 486                 if ($photo_failure && $quit_on_error) {
 487                         return false;
 488                 }
 489
 490                 if ($photo_failure) {
 491                         $image_url = System::baseUrl() . "/images/person-300.jpg";
 492                         $thumb = System::baseUrl() . "/images/person-80.jpg";
 493                         $micro = System::baseUrl() . "/images/person-48.jpg";
 494                 }
 495
 496                 return [$image_url, $thumb, $micro];
 497         }
 498
 499         /**
 500          * @param array $exifCoord coordinate
 501          * @param string $hemi      hemi
 502          * @return float
 503          */
 504         public static function getGps($exifCoord, $hemi)
 505         {
 506                 $degrees = count($exifCoord) > 0 ? self::gps2Num($exifCoord[0]) : 0;
 507                 $minutes = count($exifCoord) > 1 ? self::gps2Num($exifCoord[1]) : 0;
 508                 $seconds = count($exifCoord) > 2 ? self::gps2Num($exifCoord[2]) : 0;
 509
 510                 $flip = ($hemi == "W" || $hemi == "S") ? -1 : 1;
 511
 512                 return floatval($flip * ($degrees + ($minutes / 60) + ($seconds / 3600)));
 513         }
 514
 515         /**
 516          * @param string $coordPart coordPart
 517          * @return float
 518          */
 519         private static function gps2Num($coordPart)
 520         {
 521                 $parts = explode("/", $coordPart);
 522
 523                 if (count($parts) <= 0) {
 524                         return 0;
 525                 }
 526
 527                 if (count($parts) == 1) {
 528                         return $parts[0];
 529                 }
 530
 531                 return floatval($parts[0]) / floatval($parts[1]);
 532         }
 533
 534         /**
 535          * @brief Fetch the photo albums that are available for a viewer
 536          *
 537          * The query in this function is cost intensive, so it is cached.
 538          *
 539          * @param int  $uid    User id of the photos
 540          * @param bool $update Update the cache
 541          *
 542          * @return array Returns array of the photo albums
 543          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 544          */
 545         public static function getAlbums($uid, $update = false)
 546         {
 547                 $sql_extra = Security::getPermissionsSQLByUserId($uid);
 548
 549                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 550                 $albums = Cache::get($key);
 551                 if (is_null($albums) || $update) {
 552                         if (!Config::get("system", "no_count", false)) {
 553                                 /// @todo This query needs to be renewed. It is really slow
 554                                 // At this time we just store the data in the cache
 555                                 $albums = q("SELECT COUNT(DISTINCT `resource-id`) AS `total`, `album`, ANY_VALUE(`created`) AS `created`
 556                                         FROM `photo`
 557                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra
 558                                         GROUP BY `album` ORDER BY `created` DESC",
 559                                         intval($uid),
 560                                         DBA::escape("Contact Photos"),
 561                                         DBA::escape(L10n::t("Contact Photos"))
 562                                 );
 563                         } else {
 564                                 // This query doesn't do the count and is much faster
 565                                 $albums = q("SELECT DISTINCT(`album`), '' AS `total`
 566                                         FROM `photo` USE INDEX (`uid_album_scale_created`)
 567                                         WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra",
 568                                         intval($uid),
 569                                         DBA::escape("Contact Photos"),
 570                                         DBA::escape(L10n::t("Contact Photos"))
 571                                 );
 572                         }
 573                         Cache::set($key, $albums, Cache::DAY);
 574                 }
 575                 return $albums;
 576         }
 577
 578         /**
 579          * @param int $uid User id of the photos
 580          * @return void
 581          * @throws \Exception
 582          */
 583         public static function clearAlbumCache($uid)
 584         {
 585                 $key = "photo_albums:".$uid.":".local_user().":".remote_user();
 586                 Cache::set($key, null, Cache::DAY);
 587         }
 588
 589         /**
 590          * Generate a unique photo ID.
 591          *
 592          * @return string
 593          * @throws \Exception
 594          */
 595         public static function newResource()
 596         {
 597                 return System::createGUID(32, false);
 598         }
 599
 600         /**
 601          * Changes photo permissions that had been embedded in a post
 602          *
 603          * @todo This function currently does have some flaws:
 604          * - Sharing a post with a forum will create a photo that only the forum can see.
 605          * - Sharing a photo again that been shared non public before doesn't alter the permissions.
 606          *
 607          * @return string
 608          * @throws \Exception
 609          */
 610         public static function setPermissionFromBody($body, $uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)
 611         {
 612                 // Simplify image codes
 613                 $img_body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 614                 $img_body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $img_body);
 615
 616                 // Search for images
 617                 if (!preg_match_all("/\[img\](.*?)\[\/img\]/", $img_body, $match)) {
 618                         return false;
 619                 }
 620                 $images = $match[1];
 621                 if (empty($images)) {
 622                         return false;
 623                 }
 624
 625                 foreach ($images as $image) {
 626                         if (!stristr($image, System::baseUrl() . '/photo/')) {
 627                                 continue;
 628                         }
 629                         $image_uri = substr($image,strrpos($image,'/') + 1);
 630                         $image_uri = substr($image_uri,0, strpos($image_uri,'-'));
 631                         if (!strlen($image_uri)) {
 632                                 continue;
 633                         }
 634
 635                         // Ensure to only modify photos that you own
 636                         $srch = '<' . intval($original_contact_id) . '>';
 637
 638                         $condition = [
 639                                 'allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
 640                                 'resource-id' => $image_uri, 'uid' => $uid
 641                         ];
 642                         if (!Photo::exists($condition)) {
 643                                 continue;
 644                         }
 645
 646                         /// @todo Check if $str_contact_allow does contain a public forum. Then set the permissions to public.
 647
 648                         $fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
 649                                         'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
 650                         $condition = ['resource-id' => $image_uri, 'uid' => $uid];
 651                         Logger::info('Set permissions', ['condition' => $condition, 'permissions' => $fields]);
 652                         Photo::update($fields, $condition);
 653                 }
 654
 655                 return true;
 656         }
 657
 658         /**
 659          * Strips known picture extensions from picture links
 660          *
 661          * @param string $name Picture link
 662          * @return string stripped picture link
 663          * @throws \Exception
 664          */
 665         public static function stripExtension($name)
 666         {
 667                 $name = str_replace([".jpg", ".png", ".gif"], ["", "", ""], $name);
 668                 foreach (Images::supportedTypes() as $m => $e) {
 669                         $name = str_replace("." . $e, "", $name);
 670                 }
 671                 return $name;
 672         }
 673
 674         /**
 675          * Returns the GUID from picture links
 676          *
 677          * @param string $name Picture link
 678          * @return string GUID
 679          * @throws \Exception
 680          */
 681         public static function getGUID($name)
 682         {
 683                 $a = \get_app();
 684                 $base = $a->getBaseURL();
 685
 686                 $guid = str_replace([Strings::normaliseLink($base), '/photo/'], '', Strings::normaliseLink($name));
 687
 688                 $guid = self::stripExtension($guid);
 689                 if (substr($guid, -2, 1) != "-") {
 690                         return '';
 691                 }
 692
 693                 $scale = intval(substr($guid, -1, 1));
 694                 if (!is_numeric($scale)) {
 695                         return '';
 696                 }
 697
 698                 $guid = substr($guid, 0, -2);
 699                 return $guid;
 700         }
 701
 702         /**
 703          * Tests if the picture link points to a locally stored picture
 704          *
 705          * @param string $name Picture link
 706          * @return boolean
 707          * @throws \Exception
 708          */
 709         public static function isLocal($name)
 710         {
 711                 $guid = self::getGUID($name);
 712
 713                 if (empty($guid)) {
 714                         return false;
 715                 }
 716
 717                 return DBA::exists('photo', ['resource-id' => $guid]);
 718         }
 719
 720         /**
 721          * Tests if the link points to a locally stored picture page
 722          *
 723          * @param string $name Page link
 724          * @return boolean
 725          * @throws \Exception
 726          */
 727         public static function isLocalPage($name)
 728         {
 729                 $a = \get_app();
 730                 $base = $a->getBaseURL();
 731
 732                 $guid = str_replace(Strings::normaliseLink($base), '', Strings::normaliseLink($name));
 733                 $guid = preg_replace("=/photos/.*/image/(.*)=ism", '$1', $guid);
 734                 if (empty($guid)) {
 735                         return false;
 736                 }
 737
 738                 return DBA::exists('photo', ['resource-id' => $guid]);
 739         }
 740 }