DNRoot::getPostSnapshotForm PHP Method

    public function getPostSnapshotForm(\SS_HTTPRequest $request)
    {
        // Performs canView permission check by limiting visible projects
        $project = $this->getCurrentProject();
        if (!$project) {
            return $this->project404Response();
        }
        if (!$project->canUploadArchive()) {
            return new SS_HTTPResponse("Not allowed to upload", 401);
        }
        // Framing an environment as a "group of people with download access"
        // makes more sense to the user here, while still allowing us to enforce
        // environment specific restrictions on downloading the file later on.
        $envs = $project->DNEnvironmentList()->filterByCallback(function ($item) {
            return $item->canUploadArchive();
        });
        $envsMap = [];
        foreach ($envs as $env) {
            $envsMap[$env->ID] = $env->Name;
        }
        $form = Form::create($this, 'PostSnapshotForm', FieldList::create(DropdownField::create('Mode', 'What does this file contain?', DNDataArchive::get_mode_map()), DropdownField::create('EnvironmentID', 'Initial ownership of the file', $envsMap)->setEmptyString('Select an environment')), FieldList::create(FormAction::create('doPostSnapshot', 'Submit request')->addExtraClass('btn')), RequiredFields::create('File'));
        $form->disableSecurityToken();
        $form->addExtraClass('fields-wide');
        // Tweak the action so it plays well with our fake URL structure.
        $form->setFormAction($project->Link() . '/PostSnapshotForm');
        return $form;
    }