SilverStripe\AssetAdmin\Controller\AssetAdmin

Complexity

Total Complexity

94

Size/Duplication

Total Lines	838
Duplicated Lines	6.44 %

Coupling/Cohesion

Components	2
Dependencies	8

Importance

Changes	32
Bugs	7	Features	7

23 Methods

Rating	Name	Duplication	Size	Complexity
A	apiSearch()	0	17	1
A	getFileEditLink()	0	12	3
A	init()	0	14	1
B	getClientConfig()	0	46	1
C	apiReadFolder()	0	64	12
C	apiDelete()	11	38	8
C	apiCreateFile()	16	54	11
C	apiCreateFolder()	7	60	14
A	legacyRedirectForEditView()	0	8	2
B	getSearchContext()	0	42	1
A	getNameGenerator()	0	5	1
A	breadcrumbs()	0	4	1
A	baseCSSClasses()	0	4	1
A	providePermissions()	0	11	1
B	getFileEditForm()	0	53	4
A	FileEditForm()	0	7	2
B	save()	12	30	5
B	getObjectFromData()	0	50	6
C	getList()	8	60	10
A	addtocampaign()	0	20	3
A	AddToCampaignForm()	0	6	2
B	getAddToCampaignForm()	0	27	3
A	getUpload()	0	10	1

<?php

namespace SilverStripe\AssetAdmin\Controller;

use SilverStripe\Admin\AddToCampaignHandler;
use SilverStripe\Admin\CMSBatchActionHandler;
use SilverStripe\Admin\LeftAndMain;
use SilverStripe\Assets\File;
use SilverStripe\Assets\Folder;
use SilverStripe\Assets\Storage\AssetNameGenerator;
use SilverStripe\Assets\Upload;
use SilverStripe\Control\Controller;
use SilverStripe\Control\SS_HTTPRequest;
use SilverStripe\Control\SS_HTTPResponse;
use SilverStripe\Core\Convert;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Forms\CheckboxField;
use SilverStripe\Forms\DateField;
use SilverStripe\Forms\DropdownField;
use SilverStripe\Forms\FieldGroup;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FormAction;
use SilverStripe\Forms\HeaderField;
use SilverStripe\Forms\PopoverField;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\DataList;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\FieldType\DBHTMLText;
use SilverStripe\ORM\Search\SearchContext;
use SilverStripe\Security\Member;
use SilverStripe\Security\PermissionProvider;
use SilverStripe\Security\SecurityToken;
use SilverStripe\View\Requirements;

/**
 * AssetAdmin is the 'file store' section of the CMS.
 * It provides an interface for manipulating the File and Folder objects in the system.
 */
class AssetAdmin extends LeftAndMain implements PermissionProvider
{
    private static $url_segment = 'assets';

The property $url_segment is not used and could be removed.

Consider using a different property name as you override a private property of the parent class.

    private static $url_rule = '/$Action/$ID';

The property $url_rule is not used and could be removed.

Consider using a different property name as you override a private property of the parent class.

    private static $menu_title = 'Files';

The property $menu_title is not used and could be removed.

Consider using a different property name as you override a private property of the parent class.

    private static $tree_class = 'SilverStripe\\Assets\\Folder';

Consider using a different property name as you override a private property of the parent class.

The property $tree_class is not used and could be removed.

    private static $url_handlers = [

The property $url_handlers is not used and could be removed.

Consider using a different property name as you override a private property of the parent class.

        // Legacy redirect for SS3-style detail view
        'EditForm/field/File/item/$FileID/$Action' => 'legacyRedirectForEditView',
        // Pass all URLs to the index, for React to unpack
        'show/$FolderID/edit/$FileID' => 'index',
        // API access points with structured data
        'POST api/createFolder' => 'apiCreateFolder',
        'POST api/createFile' => 'apiCreateFile',
        'GET api/readFolder' => 'apiReadFolder',
        'PUT api/updateFolder' => 'apiUpdateFolder',
        'DELETE api/delete' => 'apiDelete',
        'GET api/search' => 'apiSearch',
    ];

    /**
     * Amount of results showing on a single page.
     *
     * @config
     * @var int
     */
    private static $page_length = 15;

The property $page_length is not used and could be removed.

    /**
     * @config
     * @see Upload->allowedMaxFileSize
     * @var int
     */
    private static $allowed_max_file_size;

The property $allowed_max_file_size is not used and could be removed.

    /**
     * @var array
     */
    private static $allowed_actions = array(

Consider using a different property name as you override a private property of the parent class.

The property $allowed_actions is not used and could be removed.

        'legacyRedirectForEditView',
        'apiCreateFolder',
        'apiCreateFile',
        'apiReadFolder',
        'apiUpdateFolder',
        'apiDelete',
        'apiSearch',
        'FileEditForm',
        'AddToCampaignForm',
    );

    private static $required_permission_codes = 'CMS_ACCESS_AssetAdmin';

The property $required_permission_codes is not used and could be removed.

Consider using a different property name as you override a private property of the parent class.

    /**
     * Set up the controller
     */
    public function init()
    {
        parent::init();

        Requirements::add_i18n_javascript(ASSET_ADMIN_DIR . '/client/lang', false, true);
        Requirements::javascript(ASSET_ADMIN_DIR . "/client/dist/js/bundle.js");
        Requirements::css(ASSET_ADMIN_DIR . "/client/dist/styles/bundle.css");

        CMSBatchActionHandler::register(
            'delete',
            'SilverStripe\AssetAdmin\BatchAction\DeleteAssets',
            'SilverStripe\\Assets\\Folder'
        );
    }

    public function getClientConfig()
    {
        $baseLink = $this->Link();
        return array_merge( parent::getClientConfig(), [
            'reactRouter' => true,
            'createFileEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/createFile'),
                'method' => 'post',
                'payloadFormat' => 'urlencoded',
            ],
            'createFolderEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/createFolder'),
                'method' => 'post',
                'payloadFormat' => 'urlencoded',
            ],
            'readFolderEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/readFolder'),
                'method' => 'get',
                'responseFormat' => 'json',
            ],
            'searchEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/search'),
                'method' => 'get',
                'responseFormat' => 'json',
            ],
            'updateFolderEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/updateFolder'),
                'method' => 'put',
                'payloadFormat' => 'urlencoded',
            ],
            'deleteEndpoint' => [
                'url' => Controller::join_links($baseLink, 'api/delete'),
                'method' => 'delete',
                'payloadFormat' => 'urlencoded',
            ],
            'limit' => $this->config()->page_length,
            'form' => [
                'FileEditForm' => [
                    'schemaUrl' => $this->Link('schema/FileEditForm')
                ],
                'AddToCampaignForm' => [
                    'schemaUrl' => $this->Link('schema/AddToCampaignForm')
                ],
            ],
        ]);
    }

    /**
     * Fetches a collection of files by ParentID.
     *
     * @param SS_HTTPRequest $request
     * @return SS_HTTPResponse
     */
    public function apiReadFolder(SS_HTTPRequest $request)
    {
        $params = $request->requestVars();
        $items = array();
        $parentId = null;

$parentId is not used, you could remove the assignment.

        $folderID = null;

$folderID is not used, you could remove the assignment.

        if (!isset($params['id']) && !strlen($params['id'])) {
            $this->httpError(400);
        }

        $folderID = (int)$params['id'];
        /** @var Folder $folder */
        $folder = $folderID ? Folder::get()->byID($folderID) : Folder::singleton();

        if (!$folder) {
            $this->httpError(400);
        }

        // TODO Limit results to avoid running out of memory (implement client-side pagination)
        $files = $this->getList()->filter('ParentID', $folderID);

        if ($files) {
            /** @var File $file */
            foreach ($files as $file) {
                if (!$file->canView()) {
                    continue;
                }

                $items[] = $this->getObjectFromData($file);
            }
        }

        // Build parents (for breadcrumbs)
        $parents = [];
        $next = $folder->Parent();
        while($next && $next->exists()) {
            array_unshift($parents, [
                'id' => $next->ID,
                'title' => $next->getTitle(),
            ]);
            if($next->ParentID) {
                $next = $next->Parent();
            } else {
                break;
            }
        }

        // Build response
        $response = new SS_HTTPResponse();
        $response->addHeader('Content-Type', 'application/json');
        $response->setBody(json_encode([
            'files' => $items,
            'title' => $folder->getTitle(),
            'count' => count($items),
            'parents' => $parents,
            'parentID' => $folder->exists() ? $folder->ParentID : null, // grandparent
            'folderID' => $folderID,
            'canEdit' => $folder->canEdit(),
            'canDelete' => $folder->canDelete(),
        ]));

        return $response;
    }

    /**
     * @param SS_HTTPRequest $request
     *
     * @return SS_HTTPResponse
     */
    public function apiSearch(SS_HTTPRequest $request)
    {
        $params = $request->getVars();
        $list = $this->getList($params);

        $response = new SS_HTTPResponse();
        $response->addHeader('Content-Type', 'application/json');
        $response->setBody(json_encode([
            // Serialisation
            "files" => array_map(function($file) {
                return $this->getObjectFromData($file);
            }, $list->toArray()),
            "count" => $list->count(),
        ]));

        return $response;
    }

    /**
     * @param SS_HTTPRequest $request
     *
     * @return SS_HTTPResponse
     */
    public function apiDelete(SS_HTTPRequest $request)
    {
        parse_str($request->getBody(), $vars);

        // CSRF check
        $token = SecurityToken::inst();
        if (empty($vars[$token->getName()]) || !$token->check($vars[$token->getName()])) {

This code seems to be duplicated across your project.

            return new SS_HTTPResponse(null, 400);
        }

        if (!isset($vars['ids']) || !$vars['ids']) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 400))
                ->addHeader('Content-Type', 'application/json');
        }

        $fileIds = $vars['ids'];
        $files = $this->getList()->filter("ID", $fileIds)->toArray();

        if (!count($files)) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 404))
                ->addHeader('Content-Type', 'application/json');
        }

        if (!min(array_map(function (File $file) {
            return $file->canDelete();
        }, $files))) {
            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 401))
                ->addHeader('Content-Type', 'application/json');
        }

        /** @var File $file */
        foreach ($files as $file) {
            $file->delete();
        }

        return (new SS_HTTPResponse(json_encode(['status' => 'file was deleted'])))
            ->addHeader('Content-Type', 'application/json');
    }

    /**
     * Creates a single file based on a form-urlencoded upload.
     *
     * @param SS_HTTPRequest $request
     * @return SS_HTTPRequest|SS_HTTPResponse
     */
    public function apiCreateFile(SS_HTTPRequest $request)
    {
        $data = $request->postVars();
        $upload = $this->getUpload();

        // CSRF check
        $token = SecurityToken::inst();
        if (empty($data[$token->getName()]) || !$token->check($data[$token->getName()])) {

This code seems to be duplicated across your project.

            return new SS_HTTPResponse(null, 400);
        }

        // check canAddChildren permissions
        if (!empty($data['ParentID']) && is_numeric($data['ParentID'])) {
            $parentRecord = Folder::get()->byID($data['ParentID']);
            if ($parentRecord->hasMethod('canAddChildren') && !$parentRecord->canAddChildren()) {

This code seems to be duplicated across your project.

                return (new SS_HTTPResponse(json_encode(['status' => 'error']), 403))
                    ->addHeader('Content-Type', 'application/json');
            }
        } else {
            $parentRecord = Folder::singleton();
        }

        // check create permissions
        if (!$parentRecord->canCreate()) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 403))
                ->addHeader('Content-Type', 'application/json');
        }

        /** @skipUpgrade */
        $tmpFile = $request->postVar('Upload');
        if(!$upload->validate($tmpFile)) {
            $result = ['error' => $upload->getErrors()];
            return (new SS_HTTPResponse(json_encode($result), 400))
                ->addHeader('Content-Type', 'application/json');
        }

        // TODO Allow batch uploads
        $fileClass = File::get_class_for_file_extension(File::get_file_extension($tmpFile['name']));
        $file = Injector::inst()->create($fileClass);
        $uploadResult = $upload->loadIntoFile($tmpFile, $file, $parentRecord ? $parentRecord->getFilename() : '/');
        if(!$uploadResult) {

This code seems to be duplicated across your project.

            $result = ['error' => 'unknown'];
            return (new SS_HTTPResponse(json_encode($result), 400))
                ->addHeader('Content-Type', 'application/json');
        }

        $file->ParentID = $parentRecord->ID;
        $file->write();

        $result = [$this->getObjectFromData($file)];

        return (new SS_HTTPResponse(json_encode($result)))
            ->addHeader('Content-Type', 'application/json');
    }

    /**
     * Creates a single folder, within an optional parent folder.
     *
     * @param SS_HTTPRequest $request
     * @return SS_HTTPRequest|SS_HTTPResponse
     */
    public function apiCreateFolder(SS_HTTPRequest $request)
    {
        $data = $request->postVars();

        $class = 'SilverStripe\\Assets\\Folder';

        // CSRF check
        $token = SecurityToken::inst();
        if (empty($data[$token->getName()]) || !$token->check($data[$token->getName()])) {

This code seems to be duplicated across your project.

            return new SS_HTTPResponse(null, 400);
        }

        // check addchildren permissions
        if (!empty($data['ParentID']) && is_numeric($data['ParentID'])) {
            $parentRecord = DataObject::get_by_id($class, $data['ParentID']);
            if ($parentRecord->hasMethod('canAddChildren') && !$parentRecord->canAddChildren()) {

This code seems to be duplicated across your project.

                return (new SS_HTTPResponse(null, 403))
                    ->addHeader('Content-Type', 'application/json');
            }
        } else {
            $parentRecord = singleton($class);
        }
        $data['ParentID'] = ($parentRecord->exists()) ? (int)$parentRecord->ID : 0;

        // check create permissions
        if (!$parentRecord->canCreate()) {
            return (new SS_HTTPResponse(null, 403))
                ->addHeader('Content-Type', 'application/json');
        }

        // Build filename
        $baseFilename = isset($data['Name'])
            ? basename($data['Name'])
            : _t('AssetAdmin.NEWFOLDER', "NewFolder");

        if ($parentRecord && $parentRecord->ID) {
            $baseFilename = $parentRecord->getFilename() . '/' . $baseFilename;
        }

        // Ensure name is unique
        $nameGenerator = $this->getNameGenerator($baseFilename);
        $filename = null;
        foreach ($nameGenerator as $filename) {
            if (! File::find($filename)) {
                break;
            }
        }
        $data['Name'] = basename($filename);

        // Create record
        /** @var Folder $record */
        $record = Injector::inst()->create($class);
        $record->ParentID = $data['ParentID'];
        $record->Name = $record->Title = basename($data['Name']);
        $record->write();

        $result = $this->getObjectFromData($record);

        return (new SS_HTTPResponse(json_encode($result)))->addHeader('Content-Type', 'application/json');
    }

    /**
     * Redirects 3.x style detail links to new 4.x style routing.
     *
     * @param SS_HTTPRequest $request
     */
    public function legacyRedirectForEditView($request)
    {
        $fileID = $request->param('FileID');
        /** @var File $file */
        $file = File::get()->byID($fileID);
        $link = $this->getFileEditLink($file) ?: $this->Link();
        $this->redirect($link);
    }

    /**
     * Given a file return the CMS link to edit it
     *
     * @param File $file
     * @return string
     */
    public function getFileEditLink($file) {
        if(!$file || !$file->isInDB()) {
            return null;
        }

        return Controller::join_links(
            $this->Link('show'),
            $file->ParentID,
            'edit',
            $file->ID
        );
    }

    /**
     * Get the search context from {@link File}, used to create the search form
     * as well as power the /search API endpoint.
     *
     * @return SearchContext
     */
    public function getSearchContext()
    {
        $context = File::singleton()->getDefaultSearchContext();

        // Customize fields
        $dateHeader = HeaderField::create('Date', _t('CMSSearch.FILTERDATEHEADING', 'Date'), 4);
        $dateFrom = DateField::create('CreatedFrom', _t('CMSSearch.FILTERDATEFROM', 'From'))
            ->setConfig('showcalendar', true);
        $dateTo = DateField::create('CreatedTo', _t('CMSSearch.FILTERDATETO', 'To'))
            ->setConfig('showcalendar', true);
        $dateGroup = FieldGroup::create(
            $dateHeader,
            $dateFrom,
            $dateTo
        );
        $context->addField($dateGroup);
        /** @skipUpgrade */
        $appCategories = array(
            'archive' => _t('AssetAdmin.AppCategoryArchive', 'Archive', 'A collection of files'),
            'audio' => _t('AssetAdmin.AppCategoryAudio', 'Audio'),
            'document' => _t('AssetAdmin.AppCategoryDocument', 'Document'),
            'flash' => _t('AssetAdmin.AppCategoryFlash', 'Flash', 'The fileformat'),
            'image' => _t('AssetAdmin.AppCategoryImage', 'Image'),
            'video' => _t('AssetAdmin.AppCategoryVideo', 'Video'),
        );
        $context->addField(
            $typeDropdown = new DropdownField(
                'AppCategory',
                _t('AssetAdmin.Filetype', 'File type'),
                $appCategories
            )
        );

        $typeDropdown->setEmptyString(' ');

        $context->addField(
            new CheckboxField('CurrentFolderOnly', _t('AssetAdmin.CurrentFolderOnly', 'Limit to current folder?'))
        );
        $context->getFields()->removeByName('Title');

        return $context;
    }

    /**
     * Get an asset renamer for the given filename.
     *
     * @param  string             $filename Path name
     * @return AssetNameGenerator
     */
    protected function getNameGenerator($filename)
    {
        return Injector::inst()
            ->createWithArgs('AssetNameGenerator', array($filename));
    }

    /**
     * @todo Implement on client
     *
     * @param bool $unlinked
     * @return ArrayList
     */
    public function breadcrumbs($unlinked = false)
    {
        return null;
    }


    /**
     * Don't include class namespace in auto-generated CSS class
     */
    public function baseCSSClasses()
    {
        return 'AssetAdmin LeftAndMain';
    }

    public function providePermissions()
    {
        return array(
            "CMS_ACCESS_AssetAdmin" => array(
                'name' => _t('CMSMain.ACCESS', "Access to '{title}' section", array(

array('title' => static::menu_title()) is of type array<string,string,{"title":"string"}>, but the function expects a string.

                    'title' => static::menu_title()
                )),
                'category' => _t('Permission.CMS_ACCESS_CATEGORY', 'CMS Access')
            )
        );
    }

    /**
     * The form is used to generate a form schema,
     * as well as an intermediary object to process data through API endpoints.
     * Since it's used directly on API endpoints, it does not have any form actions.
     * It handles both {@link File} and {@link Folder} records.
     *
     * @param int $id
     * @return Form
     */
    public function getFileEditForm($id)
    {
        /** @var File $file */
        $file = $this->getList()->byID($id);

        $fields = $file->getCMSFields();

        $actions = FieldList::create([
            FormAction::create('save', _t('CMSMain.SAVE', 'Save'))
                ->setIcon('save')
        ]);

        // Delete action
        $actions->push(
            FormAction::create(
                'delete',
                _t('SilverStripe\\AssetAdmin\\Controller\\AssetAdmin.DELETE_BUTTON', 'Delete')
            )
                ->setIcon('trash-bin')
        );

        // Add to campaign action
        if (!$file instanceof Folder) {

The class SilverStripe\Assets\Folder does not exist. Did you forget a USE statement, or did you not list all dependencies?

            $actions->push(PopoverField::create([
                FormAction::create(
                    'addtocampaign',
                    _t('CAMPAIGNS.ADDTOCAMPAIGN', 'Add to campaign')
                ),
            ])
                ->setPlacement('top')
            );
        }

        $form = Form::create(
            $this,
            'FileEditForm',
            $fields,
            $actions
        );

        // Load into form
        if($id && $file) {
            $form->loadDataFrom($file);
        }

        // Configure form to respond to validation errors with form schema
        // if requested via react.
        $form->setValidationResponseCallback(function() use ($form) {
            return $this->getSchemaResponse($form);
        });

        return $form;
    }

    /**
     * Get file edit form
     *
     * @return Form
     */
    public function FileEditForm()
    {
        // Get ID either from posted back value, or url parameter
        $request = $this->getRequest();
        $id = $request->param('ID') ?: $request->postVar('ID');
        return $this->getFileEditForm($id);
    }

    /**
     * @param array $data
     * @param Form $form
     * @return SS_HTTPResponse
     */
    public function save($data, $form)
    {
        if (!isset($data['ID']) || !is_numeric($data['ID'])) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 400))
                ->addHeader('Content-Type', 'application/json');
        }

        $id = (int) $data['ID'];
        $record = $this->getList()->filter('ID', $id)->first();

        if (!$record) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 404))
                ->addHeader('Content-Type', 'application/json');
        }

        if (!$record->canEdit()) {

This code seems to be duplicated across your project.

            return (new SS_HTTPResponse(json_encode(['status' => 'error']), 401))
                ->addHeader('Content-Type', 'application/json');
        }

        $form->saveInto($record);
        $record->write();

        // Return the record data in the same response as the schema to save a postback
        $schemaData = $this->getSchemaForForm($this->getFileEditForm($id));
        $schemaData['record'] = $this->getObjectFromData($record);

$record is of type object<SilverStripe\ORM\DataObject>, but the function expects a object<SilverStripe\Assets\File>.

        $response = new SS_HTTPResponse(Convert::raw2json($schemaData));
        $response->addHeader('Content-Type', 'application/json');
        return $response;

The return type of return $response; (SilverStripe\Control\SS_HTTPResponse) is incompatible with the return type of the parent method SilverStripe\Admin\LeftAndMain::save of type SS_HTTPResponse|null.

    }

    /**
     * @param File $file
     *
     * @return array
     */
    protected function getObjectFromData(File $file)
    {
        $object = array(
            'id' => $file->ID,
            'created' => $file->Created,
            'lastUpdated' => $file->LastEdited,
            'owner' => null,
            'parent' => null,
            'title' => $file->Title,
            'exists' => $file->exists(), // Broken file check
            'type' => $file instanceof Folder ? 'folder' : $file->FileType,

The class SilverStripe\Assets\Folder does not exist. Did you forget a USE statement, or did you not list all dependencies?

            'category' => $file instanceof Folder ? 'folder' : $file->appCategory(),

The class SilverStripe\Assets\Folder does not exist. Did you forget a USE statement, or did you not list all dependencies?

            'name' => $file->Name,
            'filename' => $file->Filename,
            'extension' => $file->Extension,
            'size' => $file->Size,
            'url' => $file->AbsoluteURL,
            'canEdit' => $file->canEdit(),
            'canDelete' => $file->canDelete()
        );

        /** @var Member $owner */
        $owner = $file->Owner();

        if ($owner) {
            $object['owner'] = array(
                'id' => $owner->ID,
                'title' => trim($owner->FirstName . ' ' . $owner->Surname),
            );
        }

        /** @var Folder $parent */
        $parent = $file->Parent();

        if ($parent) {
            $object['parent'] = array(
                'id' => $parent->ID,
                'title' => $parent->Title,
                'filename' => $parent->Filename,
            );
        }

        /** @var File $file */
        if ($file->getIsImage()) {
            $object['dimensions']['width'] = $file->Width;
            $object['dimensions']['height'] = $file->Height;
        }

        return $object;
    }


    /**
     * Returns the files and subfolders contained in the currently selected folder,
     * defaulting to the root node. Doubles as search results, if any search parameters
     * are set through {@link SearchForm()}.
     *
     * @param array $params Unsanitised request parameters
     * @return DataList
     */
    protected function getList($params = array())
    {
        $context = $this->getSearchContext();

        // Overwrite name filter to search both Name and Title attributes
        $context->removeFilterByName('Name');

        // Lazy loaded list. Allows adding new filters through SearchContext.
        $list = $context->getResults($params);

        // Re-add previously removed "Name" filter as combined filter
        // TODO Replace with composite SearchFilter once that API exists
        if(!empty($params['Name'])) {
            $list = $list->filterAny(array(
                'Name:PartialMatch' => $params['Name'],
                'Title:PartialMatch' => $params['Name']
            ));
        }

        // Optionally limit search to a folder (non-recursive)
        if(!empty($params['ParentID']) && is_numeric($params['ParentID'])) {
            $list = $list->filter('ParentID', $params['ParentID']);
        }

        // Date filtering
        if (!empty($params['CreatedFrom'])) {

This code seems to be duplicated across your project.

            $fromDate = new DateField(null, null, $params['CreatedFrom']);
            $list = $list->filter("Created:GreaterThanOrEqual", $fromDate->dataValue().' 00:00:00');
        }
        if (!empty($params['CreatedTo'])) {

This code seems to be duplicated across your project.

            $toDate = new DateField(null, null, $params['CreatedTo']);
            $list = $list->filter("Created:LessThanOrEqual", $toDate->dataValue().' 23:59:59');
        }

        // Categories
        if (!empty($filters['AppCategory']) && !empty(File::config()->app_categories[$filters['AppCategory']])) {

The variable $filters seems to never exist, and therefore empty should always return true. Did you maybe rename this variable?

            $extensions = File::config()->app_categories[$filters['AppCategory']];
            $list = $list->filter('Name:PartialMatch', $extensions);
        }

        // Sort folders first
        $list = $list->sort(
            '(CASE WHEN "File"."ClassName" = \'Folder\' THEN 0 ELSE 1 END), "Name"'
        );

        // Pagination
        if (isset($filters['page']) && isset($filters['limit'])) {
            $page = $filters['page'];
            $limit = $filters['limit'];
            $offset = ($page - 1) * $limit;
            $list = $list->limit($limit, $offset);
        }

        // Access checks
        $list = $list->filterByCallback(function(File $file) {
            return $file->canView();
        });

        return $list;
    }

    /**
     * Action handler for adding pages to a campaign
     *
     * @param array $data
     * @param Form $form
     * @return DBHTMLText|SS_HTTPResponse
     */
    public function addtocampaign($data, $form)

The parameter $form is not used and could be removed.

    {
        $id = $data['ID'];
        $record = $this->getList()->byID($id);

        $handler = AddToCampaignHandler::create($this, $record);
        $results = $handler->addToCampaign($record, $data['Campaign']);

It seems like $record defined by $this->getList()->byID($id) on line 801 can be null; however, SilverStripe\Admin\AddToCampaignHandler::addToCampaign() does not accept null, maybe add an additional type check?

        if (!is_null($results)) {
            $request = $this->getRequest();
            if($request->getHeader('X-Formschema-Request')) {
                $data = $this->getSchemaForForm($handler->Form($record));

It seems like $record defined by $this->getList()->byID($id) on line 801 can be null; however, SilverStripe\Admin\AddToCampaignHandler::Form() does not accept null, maybe add an additional type check?

                $data['message'] = $results;

                $response = new SS_HTTPResponse(Convert::raw2json($data));
                $response->addHeader('Content-Type', 'application/json');
                return $response;
            }
            return $results;
        }
    }

    /**
     * Url handler for add to campaign form
     *
     * @param SS_HTTPRequest $request
     * @return Form
     */
    public function AddToCampaignForm($request)
    {
        // Get ID either from posted back value, or url parameter
        $id = $request->param('ID') ?: $request->postVar('ID');
        return $this->getAddToCampaignForm($id);
    }

    /**
     * @param int $id
     * @return Form
     */
    public function getAddToCampaignForm($id)
    {
        // Get record-specific fields
        $record = $this->getList()->byID($id);

        if (!$record) {
            $this->httpError(404, _t(
                'AssetAdmin.ErrorNotFound',
                'That {Type} couldn\'t be found',
                '',
                ['Type' => _t('File.SINGULARNAME')]

array('Type' => _t('File.SINGULARNAME')) is of type array<string,string,{"Type":"string"}>, but the function expects a string.

            ));
            return null;
        }
        if (!$record->canView()) {
            $this->httpError(403, _t(
                'AssetAdmin.ErrorItemPermissionDenied',
                'It seems you don\'t have the necessary permissions to add {ObjectTitle} to a campaign',
                '',
                ['ObjectTitle' => _t('File.SINGULARNAME')]

array('ObjectTitle' => _t('File.SINGULARNAME')) is of type array<string,string,{"ObjectTitle":"string"}>, but the function expects a string.

            ));
            return null;
        }

        $handler = AddToCampaignHandler::create($this, $record);
        return $handler->Form($record);
    }

    /**
     * @return Upload
     */
    protected function getUpload()
    {
        $upload = Upload::create();
        $upload->getValidator()->setAllowedExtensions(
            // filter out '' since this would be a regex problem on JS end
            array_filter(File::config()->get('allowed_extensions'))
        );

        return $upload;
    }
}