nextcloud / server

apps/files_sharing/lib/Controller/ShareesAPIController.php

Indentation +377 added lines, -377 removed lines

@@ -54,381 +54,381 @@
 
 class ShareesAPIController extends OCSController {
 
-	/** @var userId */
-	protected $userId;
-
-	/** @var IConfig */
-	protected $config;
-
-	/** @var IURLGenerator */
-	protected $urlGenerator;
-
-	/** @var IManager */
-	protected $shareManager;
-
-	/** @var bool */
-	protected $shareWithGroupOnly = false;
-
-	/** @var bool */
-	protected $shareeEnumeration = true;
-
-	/** @var int */
-	protected $offset = 0;
-
-	/** @var int */
-	protected $limit = 10;
-
-	/** @var array */
-	protected $result = [
-		'exact' => [
-			'users' => [],
-			'groups' => [],
-			'remotes' => [],
-			'remote_groups' => [],
-			'emails' => [],
-			'circles' => [],
-			'rooms' => [],
-		],
-		'users' => [],
-		'groups' => [],
-		'remotes' => [],
-		'remote_groups' => [],
-		'emails' => [],
-		'lookup' => [],
-		'circles' => [],
-		'rooms' => [],
-		'lookupEnabled' => false,
-	];
-
-	protected $reachedEndFor = [];
-	/** @var ISearch */
-	private $collaboratorSearch;
-
-	/**
-	 * @param string $UserId
-	 * @param string $appName
-	 * @param IRequest $request
-	 * @param IConfig $config
-	 * @param IURLGenerator $urlGenerator
-	 * @param IManager $shareManager
-	 * @param ISearch $collaboratorSearch
-	 */
-	public function __construct(
-		$UserId,
-		string $appName,
-		IRequest $request,
-		IConfig $config,
-		IURLGenerator $urlGenerator,
-		IManager $shareManager,
-		ISearch $collaboratorSearch
-	) {
-		parent::__construct($appName, $request);
-		$this->userId = $UserId;
-		$this->config = $config;
-		$this->urlGenerator = $urlGenerator;
-		$this->shareManager = $shareManager;
-		$this->collaboratorSearch = $collaboratorSearch;
-	}
-
-	/**
-	 * @NoAdminRequired
-	 *
-	 * @param string $search
-	 * @param string $itemType
-	 * @param int $page
-	 * @param int $perPage
-	 * @param int|int[] $shareType
-	 * @param bool $lookup
-	 * @return DataResponse
-	 * @throws OCSBadRequestException
-	 */
-	public function search(string $search = '', string $itemType = null, int $page = 1, int $perPage = 200, $shareType = null, bool $lookup = true): DataResponse {
-
-		// only search for string larger than a given threshold
-		$threshold = (int)$this->config->getSystemValue('sharing.minSearchStringLength', 0);
-		if (strlen($search) < $threshold) {
-			return new DataResponse($this->result);
-		}
-
-		// never return more than the max. number of results configured in the config.php
-		$maxResults = (int)$this->config->getSystemValue('sharing.maxAutocompleteResults', 0);
-		if ($maxResults > 0) {
-			$perPage = min($perPage, $maxResults);
-		}
-		if ($perPage <= 0) {
-			throw new OCSBadRequestException('Invalid perPage argument');
-		}
-		if ($page <= 0) {
-			throw new OCSBadRequestException('Invalid page');
-		}
-
-		$shareTypes = [
-			Share::SHARE_TYPE_USER,
-		];
-
-		if ($itemType === null) {
-			throw new OCSBadRequestException('Missing itemType');
-		} elseif ($itemType === 'file' || $itemType === 'folder') {
-			if ($this->shareManager->allowGroupSharing()) {
-				$shareTypes[] = Share::SHARE_TYPE_GROUP;
-			}
-
-			if ($this->isRemoteSharingAllowed($itemType)) {
-				$shareTypes[] = Share::SHARE_TYPE_REMOTE;
-			}
-
-			if ($this->isRemoteGroupSharingAllowed($itemType)) {
-				$shareTypes[] = Share::SHARE_TYPE_REMOTE_GROUP;
-			}
-
-			if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_EMAIL)) {
-				$shareTypes[] = Share::SHARE_TYPE_EMAIL;
-			}
-
-			if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_ROOM)) {
-				$shareTypes[] = Share::SHARE_TYPE_ROOM;
-			}
-		} else {
-			$shareTypes[] = Share::SHARE_TYPE_GROUP;
-			$shareTypes[] = Share::SHARE_TYPE_EMAIL;
-		}
-
-		// FIXME: DI
-		if (\OC::$server->getAppManager()->isEnabledForUser('circles') && class_exists('\OCA\Circles\ShareByCircleProvider')) {
-			$shareTypes[] = Share::SHARE_TYPE_CIRCLE;
-		}
-
-		if ($shareType !== null && is_array($shareType)) {
-			$shareTypes = array_intersect($shareTypes, $shareType);
-		} else if (is_numeric($shareType)) {
-			$shareTypes = array_intersect($shareTypes, [(int) $shareType]);
-		}
-		sort($shareTypes);
-
-		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
-		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
-		$this->limit = (int) $perPage;
-		$this->offset = $perPage * ($page - 1);
-
-		// In global scale mode we always search the loogup server
-		if ($this->config->getSystemValueBool('gs.enabled', false)) {
-			$lookup = true;
-			$this->result['lookupEnabled'] = true;
-		} else {
-			$this->result['lookupEnabled'] = $this->config->getAppValue('files_sharing', 'lookupServerEnabled', 'yes') === 'yes';
-		}
-
-		list($result, $hasMoreResults) = $this->collaboratorSearch->search($search, $shareTypes, $lookup, $this->limit, $this->offset);
-
-		// extra treatment for 'exact' subarray, with a single merge expected keys might be lost
-		if(isset($result['exact'])) {
-			$result['exact'] = array_merge($this->result['exact'], $result['exact']);
-		}
-		$this->result = array_merge($this->result, $result);
-		$response = new DataResponse($this->result);
-
-		if ($hasMoreResults) {
-			$response->addHeader('Link', $this->getPaginationLink($page, [
-				'search' => $search,
-				'itemType' => $itemType,
-				'shareType' => $shareTypes,
-				'perPage' => $perPage,
-			]));
-		}
-
-		return $response;
-	}
-
-	/**
-	 * @param string $user
-	 * @param int $shareType
-	 *
-	 * @return Generator<array<string>>
-	 */
-	private function getAllShareesByType(string $user, int $shareType): Generator {
-		$offset = 0;
-		$pageSize = 50;
-
-		while (count($page = $this->shareManager->getSharesBy(
-			$user,
-			$shareType,
-			null,
-			false,
-			$pageSize,
-			$offset
-		))) {
-			foreach ($page as $share) {
-				yield [$share->getSharedWith(), $share->getSharedWithDisplayName() ?? $share->getSharedWith()];
-			}
-
-			$offset += $pageSize;
-		}
-	}
-
-	private function sortShareesByFrequency(array $sharees): array {
-		usort($sharees, function(array $s1, array $s2) {
-			return $s2['count'] - $s1['count'];
-		});
-		return $sharees;
-	}
-
-	private $searchResultTypeMap = [
-		Share::SHARE_TYPE_USER => 'users',
-		Share::SHARE_TYPE_GROUP => 'groups',
-		Share::SHARE_TYPE_REMOTE => 'remotes',
-		Share::SHARE_TYPE_REMOTE_GROUP => 'remote_groups',
-		Share::SHARE_TYPE_EMAIL => 'emails',
-	];
-
-	private function getAllSharees(string $user, array $shareTypes): ISearchResult {
-		$result = [];
-		foreach ($shareTypes as $shareType) {
-			$sharees = $this->getAllShareesByType($user, $shareType);
-			$shareTypeResults = [];
-			foreach ($sharees as list($sharee, $displayname)) {
-				if (!isset($this->searchResultTypeMap[$shareType])) {
-					continue;
-				}
-
-				if (!isset($shareTypeResults[$sharee])) {
-					$shareTypeResults[$sharee] = [
-						'count' => 1,
-						'label' => $displayname,
-						'value' => [
-							'shareType' => $shareType,
-							'shareWith' => $sharee,
-						],
-					];
-				} else {
-					$shareTypeResults[$sharee]['count']++;
-				}
-			}
-			$result = array_merge($result, array_values($shareTypeResults));
-		}
-
-		$top5 = array_slice(
-			$this->sortShareesByFrequency($result),
-			0,
-			5
-		);
-
-		$searchResult = new SearchResult();
-		foreach ($this->searchResultTypeMap as $int => $str) {
-			$searchResult->addResultSet(new SearchResultType($str), [], []);
-			foreach ($top5 as $x) {
-				if ($x['value']['shareType'] === $int) {
-					$searchResult->addResultSet(new SearchResultType($str), [], [$x]);
-				}
-			}
-		}
-		return $searchResult;
-	}
-
-	/**
-	 * @NoAdminRequired
-	 *
-	 * @param string $itemType
-	 * @return DataResponse
-	 * @throws OCSBadRequestException
-	 */
-	public function findRecommended(string $itemType = null, $shareType = null): DataResponse {
-		$shareTypes = [
-			Share::SHARE_TYPE_USER,
-		];
-
-		if ($itemType === null) {
-			throw new OCSBadRequestException('Missing itemType');
-		} elseif ($itemType === 'file' || $itemType === 'folder') {
-			if ($this->shareManager->allowGroupSharing()) {
-				$shareTypes[] = Share::SHARE_TYPE_GROUP;
-			}
-
-			if ($this->isRemoteSharingAllowed($itemType)) {
-				$shareTypes[] = Share::SHARE_TYPE_REMOTE;
-			}
-
-			if ($this->isRemoteGroupSharingAllowed($itemType)) {
-				$shareTypes[] = Share::SHARE_TYPE_REMOTE_GROUP;
-			}
-
-			if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_EMAIL)) {
-				$shareTypes[] = Share::SHARE_TYPE_EMAIL;
-			}
-
-			if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_ROOM)) {
-				$shareTypes[] = Share::SHARE_TYPE_ROOM;
-			}
-		} else {
-			$shareTypes[] = Share::SHARE_TYPE_GROUP;
-			$shareTypes[] = Share::SHARE_TYPE_EMAIL;
-		}
-
-		// FIXME: DI
-		if (\OC::$server->getAppManager()->isEnabledForUser('circles') && class_exists('\OCA\Circles\ShareByCircleProvider')) {
-			$shareTypes[] = Share::SHARE_TYPE_CIRCLE;
-		}
-
-		if (isset($_GET['shareType']) && is_array($_GET['shareType'])) {
-			$shareTypes = array_intersect($shareTypes, $_GET['shareType']);
-			sort($shareTypes);
-		} else if (is_numeric($shareType)) {
-			$shareTypes = array_intersect($shareTypes, [(int) $shareType]);
-			sort($shareTypes);
-		}
-
-		return new DataResponse(
-			$this->getAllSharees($this->userId, $shareTypes)->asArray()
-		);
-	}
-
-	/**
-	 * Method to get out the static call for better testing
-	 *
-	 * @param string $itemType
-	 * @return bool
-	 */
-	protected function isRemoteSharingAllowed(string $itemType): bool {
-		try {
-			// FIXME: static foo makes unit testing unnecessarily difficult
-			$backend = \OC\Share\Share::getBackend($itemType);
-			return $backend->isShareTypeAllowed(Share::SHARE_TYPE_REMOTE);
-		} catch (\Exception $e) {
-			return false;
-		}
-	}
-
-	protected function isRemoteGroupSharingAllowed(string $itemType): bool {
-		try {
-			// FIXME: static foo makes unit testing unnecessarily difficult
-			$backend = \OC\Share\Share::getBackend($itemType);
-			return $backend->isShareTypeAllowed(Share::SHARE_TYPE_REMOTE_GROUP);
-		} catch (\Exception $e) {
-			return false;
-		}
-	}
-
-
-	/**
-	 * Generates a bunch of pagination links for the current page
-	 *
-	 * @param int $page Current page
-	 * @param array $params Parameters for the URL
-	 * @return string
-	 */
-	protected function getPaginationLink(int $page, array $params): string {
-		if ($this->isV2()) {
-			$url = $this->urlGenerator->getAbsoluteURL('/ocs/v2.php/apps/files_sharing/api/v1/sharees') . '?';
-		} else {
-			$url = $this->urlGenerator->getAbsoluteURL('/ocs/v1.php/apps/files_sharing/api/v1/sharees') . '?';
-		}
-		$params['page'] = $page + 1;
-		return '<' . $url . http_build_query($params) . '>; rel="next"';
-	}
-
-	/**
-	 * @return bool
-	 */
-	protected function isV2(): bool {
-		return $this->request->getScriptName() === '/ocs/v2.php';
-	}
+    /** @var userId */
+    protected $userId;
+
+    /** @var IConfig */
+    protected $config;
+
+    /** @var IURLGenerator */
+    protected $urlGenerator;
+
+    /** @var IManager */
+    protected $shareManager;
+
+    /** @var bool */
+    protected $shareWithGroupOnly = false;
+
+    /** @var bool */
+    protected $shareeEnumeration = true;
+
+    /** @var int */
+    protected $offset = 0;
+
+    /** @var int */
+    protected $limit = 10;
+
+    /** @var array */
+    protected $result = [
+        'exact' => [
+            'users' => [],
+            'groups' => [],
+            'remotes' => [],
+            'remote_groups' => [],
+            'emails' => [],
+            'circles' => [],
+            'rooms' => [],
+        ],
+        'users' => [],
+        'groups' => [],
+        'remotes' => [],
+        'remote_groups' => [],
+        'emails' => [],
+        'lookup' => [],
+        'circles' => [],
+        'rooms' => [],
+        'lookupEnabled' => false,
+    ];
+
+    protected $reachedEndFor = [];
+    /** @var ISearch */
+    private $collaboratorSearch;
+
+    /**
+     * @param string $UserId
+     * @param string $appName
+     * @param IRequest $request
+     * @param IConfig $config
+     * @param IURLGenerator $urlGenerator
+     * @param IManager $shareManager
+     * @param ISearch $collaboratorSearch
+     */
+    public function __construct(
+        $UserId,
+        string $appName,
+        IRequest $request,
+        IConfig $config,
+        IURLGenerator $urlGenerator,
+        IManager $shareManager,
+        ISearch $collaboratorSearch
+    ) {
+        parent::__construct($appName, $request);
+        $this->userId = $UserId;
+        $this->config = $config;
+        $this->urlGenerator = $urlGenerator;
+        $this->shareManager = $shareManager;
+        $this->collaboratorSearch = $collaboratorSearch;
+    }
+
+    /**
+     * @NoAdminRequired
+     *
+     * @param string $search
+     * @param string $itemType
+     * @param int $page
+     * @param int $perPage
+     * @param int|int[] $shareType
+     * @param bool $lookup
+     * @return DataResponse
+     * @throws OCSBadRequestException
+     */
+    public function search(string $search = '', string $itemType = null, int $page = 1, int $perPage = 200, $shareType = null, bool $lookup = true): DataResponse {
+
+        // only search for string larger than a given threshold
+        $threshold = (int)$this->config->getSystemValue('sharing.minSearchStringLength', 0);
+        if (strlen($search) < $threshold) {
+            return new DataResponse($this->result);
+        }
+
+        // never return more than the max. number of results configured in the config.php
+        $maxResults = (int)$this->config->getSystemValue('sharing.maxAutocompleteResults', 0);
+        if ($maxResults > 0) {
+            $perPage = min($perPage, $maxResults);
+        }
+        if ($perPage <= 0) {
+            throw new OCSBadRequestException('Invalid perPage argument');
+        }
+        if ($page <= 0) {
+            throw new OCSBadRequestException('Invalid page');
+        }
+
+        $shareTypes = [
+            Share::SHARE_TYPE_USER,
+        ];
+
+        if ($itemType === null) {
+            throw new OCSBadRequestException('Missing itemType');
+        } elseif ($itemType === 'file' || $itemType === 'folder') {
+            if ($this->shareManager->allowGroupSharing()) {
+                $shareTypes[] = Share::SHARE_TYPE_GROUP;
+            }
+
+            if ($this->isRemoteSharingAllowed($itemType)) {
+                $shareTypes[] = Share::SHARE_TYPE_REMOTE;
+            }
+
+            if ($this->isRemoteGroupSharingAllowed($itemType)) {
+                $shareTypes[] = Share::SHARE_TYPE_REMOTE_GROUP;
+            }
+
+            if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_EMAIL)) {
+                $shareTypes[] = Share::SHARE_TYPE_EMAIL;
+            }
+
+            if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_ROOM)) {
+                $shareTypes[] = Share::SHARE_TYPE_ROOM;
+            }
+        } else {
+            $shareTypes[] = Share::SHARE_TYPE_GROUP;
+            $shareTypes[] = Share::SHARE_TYPE_EMAIL;
+        }
+
+        // FIXME: DI
+        if (\OC::$server->getAppManager()->isEnabledForUser('circles') && class_exists('\OCA\Circles\ShareByCircleProvider')) {
+            $shareTypes[] = Share::SHARE_TYPE_CIRCLE;
+        }
+
+        if ($shareType !== null && is_array($shareType)) {
+            $shareTypes = array_intersect($shareTypes, $shareType);
+        } else if (is_numeric($shareType)) {
+            $shareTypes = array_intersect($shareTypes, [(int) $shareType]);
+        }
+        sort($shareTypes);
+
+        $this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
+        $this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+        $this->limit = (int) $perPage;
+        $this->offset = $perPage * ($page - 1);
+
+        // In global scale mode we always search the loogup server
+        if ($this->config->getSystemValueBool('gs.enabled', false)) {
+            $lookup = true;
+            $this->result['lookupEnabled'] = true;
+        } else {
+            $this->result['lookupEnabled'] = $this->config->getAppValue('files_sharing', 'lookupServerEnabled', 'yes') === 'yes';
+        }
+
+        list($result, $hasMoreResults) = $this->collaboratorSearch->search($search, $shareTypes, $lookup, $this->limit, $this->offset);
+
+        // extra treatment for 'exact' subarray, with a single merge expected keys might be lost
+        if(isset($result['exact'])) {
+            $result['exact'] = array_merge($this->result['exact'], $result['exact']);
+        }
+        $this->result = array_merge($this->result, $result);
+        $response = new DataResponse($this->result);
+
+        if ($hasMoreResults) {
+            $response->addHeader('Link', $this->getPaginationLink($page, [
+                'search' => $search,
+                'itemType' => $itemType,
+                'shareType' => $shareTypes,
+                'perPage' => $perPage,
+            ]));
+        }
+
+        return $response;
+    }
+
+    /**
+     * @param string $user
+     * @param int $shareType
+     *
+     * @return Generator<array<string>>
+     */
+    private function getAllShareesByType(string $user, int $shareType): Generator {
+        $offset = 0;
+        $pageSize = 50;
+
+        while (count($page = $this->shareManager->getSharesBy(
+            $user,
+            $shareType,
+            null,
+            false,
+            $pageSize,
+            $offset
+        ))) {
+            foreach ($page as $share) {
+                yield [$share->getSharedWith(), $share->getSharedWithDisplayName() ?? $share->getSharedWith()];
+            }
+
+            $offset += $pageSize;
+        }
+    }
+
+    private function sortShareesByFrequency(array $sharees): array {
+        usort($sharees, function(array $s1, array $s2) {
+            return $s2['count'] - $s1['count'];
+        });
+        return $sharees;
+    }
+
+    private $searchResultTypeMap = [
+        Share::SHARE_TYPE_USER => 'users',
+        Share::SHARE_TYPE_GROUP => 'groups',
+        Share::SHARE_TYPE_REMOTE => 'remotes',
+        Share::SHARE_TYPE_REMOTE_GROUP => 'remote_groups',
+        Share::SHARE_TYPE_EMAIL => 'emails',
+    ];
+
+    private function getAllSharees(string $user, array $shareTypes): ISearchResult {
+        $result = [];
+        foreach ($shareTypes as $shareType) {
+            $sharees = $this->getAllShareesByType($user, $shareType);
+            $shareTypeResults = [];
+            foreach ($sharees as list($sharee, $displayname)) {
+                if (!isset($this->searchResultTypeMap[$shareType])) {
+                    continue;
+                }
+
+                if (!isset($shareTypeResults[$sharee])) {
+                    $shareTypeResults[$sharee] = [
+                        'count' => 1,
+                        'label' => $displayname,
+                        'value' => [
+                            'shareType' => $shareType,
+                            'shareWith' => $sharee,
+                        ],
+                    ];
+                } else {
+                    $shareTypeResults[$sharee]['count']++;
+                }
+            }
+            $result = array_merge($result, array_values($shareTypeResults));
+        }
+
+        $top5 = array_slice(
+            $this->sortShareesByFrequency($result),
+            0,
+            5
+        );
+
+        $searchResult = new SearchResult();
+        foreach ($this->searchResultTypeMap as $int => $str) {
+            $searchResult->addResultSet(new SearchResultType($str), [], []);
+            foreach ($top5 as $x) {
+                if ($x['value']['shareType'] === $int) {
+                    $searchResult->addResultSet(new SearchResultType($str), [], [$x]);
+                }
+            }
+        }
+        return $searchResult;
+    }
+
+    /**
+     * @NoAdminRequired
+     *
+     * @param string $itemType
+     * @return DataResponse
+     * @throws OCSBadRequestException
+     */
+    public function findRecommended(string $itemType = null, $shareType = null): DataResponse {
+        $shareTypes = [
+            Share::SHARE_TYPE_USER,
+        ];
+
+        if ($itemType === null) {
+            throw new OCSBadRequestException('Missing itemType');
+        } elseif ($itemType === 'file' || $itemType === 'folder') {
+            if ($this->shareManager->allowGroupSharing()) {
+                $shareTypes[] = Share::SHARE_TYPE_GROUP;
+            }
+
+            if ($this->isRemoteSharingAllowed($itemType)) {
+                $shareTypes[] = Share::SHARE_TYPE_REMOTE;
+            }
+
+            if ($this->isRemoteGroupSharingAllowed($itemType)) {
+                $shareTypes[] = Share::SHARE_TYPE_REMOTE_GROUP;
+            }
+
+            if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_EMAIL)) {
+                $shareTypes[] = Share::SHARE_TYPE_EMAIL;
+            }
+
+            if ($this->shareManager->shareProviderExists(Share::SHARE_TYPE_ROOM)) {
+                $shareTypes[] = Share::SHARE_TYPE_ROOM;
+            }
+        } else {
+            $shareTypes[] = Share::SHARE_TYPE_GROUP;
+            $shareTypes[] = Share::SHARE_TYPE_EMAIL;
+        }
+
+        // FIXME: DI
+        if (\OC::$server->getAppManager()->isEnabledForUser('circles') && class_exists('\OCA\Circles\ShareByCircleProvider')) {
+            $shareTypes[] = Share::SHARE_TYPE_CIRCLE;
+        }
+
+        if (isset($_GET['shareType']) && is_array($_GET['shareType'])) {
+            $shareTypes = array_intersect($shareTypes, $_GET['shareType']);
+            sort($shareTypes);
+        } else if (is_numeric($shareType)) {
+            $shareTypes = array_intersect($shareTypes, [(int) $shareType]);
+            sort($shareTypes);
+        }
+
+        return new DataResponse(
+            $this->getAllSharees($this->userId, $shareTypes)->asArray()
+        );
+    }
+
+    /**
+     * Method to get out the static call for better testing
+     *
+     * @param string $itemType
+     * @return bool
+     */
+    protected function isRemoteSharingAllowed(string $itemType): bool {
+        try {
+            // FIXME: static foo makes unit testing unnecessarily difficult
+            $backend = \OC\Share\Share::getBackend($itemType);
+            return $backend->isShareTypeAllowed(Share::SHARE_TYPE_REMOTE);
+        } catch (\Exception $e) {
+            return false;
+        }
+    }
+
+    protected function isRemoteGroupSharingAllowed(string $itemType): bool {
+        try {
+            // FIXME: static foo makes unit testing unnecessarily difficult
+            $backend = \OC\Share\Share::getBackend($itemType);
+            return $backend->isShareTypeAllowed(Share::SHARE_TYPE_REMOTE_GROUP);
+        } catch (\Exception $e) {
+            return false;
+        }
+    }
+
+
+    /**
+     * Generates a bunch of pagination links for the current page
+     *
+     * @param int $page Current page
+     * @param array $params Parameters for the URL
+     * @return string
+     */
+    protected function getPaginationLink(int $page, array $params): string {
+        if ($this->isV2()) {
+            $url = $this->urlGenerator->getAbsoluteURL('/ocs/v2.php/apps/files_sharing/api/v1/sharees') . '?';
+        } else {
+            $url = $this->urlGenerator->getAbsoluteURL('/ocs/v1.php/apps/files_sharing/api/v1/sharees') . '?';
+        }
+        $params['page'] = $page + 1;
+        return '<' . $url . http_build_query($params) . '>; rel="next"';
+    }
+
+    /**
+     * @return bool
+     */
+    protected function isV2(): bool {
+        return $this->request->getScriptName() === '/ocs/v2.php';
+    }
 }