PhabricatorFileDetachController.php
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	<?php

	final class PhabricatorFileDetachController
	extends PhabricatorFileController {

	public function handleRequest(AphrontRequest $request) {
	$viewer = $request->getViewer();

	$object_phid = $request->getURIData('objectPHID');
	$file_phid = $request->getURIData('filePHID');

	$object = id(new PhabricatorObjectQuery())
	->setViewer($viewer)
	->withPHIDs(array($object_phid))
	->executeOne();
	if (!$object) {
	return new Aphront404Response();
	}

	$handles = $viewer->loadHandles(
	array(
	$object_phid,
	$file_phid,
	));

	$object_handle = $handles[$object_phid];
	$file_handle = $handles[$file_phid];
	$cancel_uri = $file_handle->getURI();

	$dialog = $this->newDialog()
	->setViewer($viewer)
	->setTitle(pht('Detach File'))
	->addCancelButton($cancel_uri, pht('Close'));

	$file_link = phutil_tag('strong', array(), $file_handle->renderLink());
	$object_link = phutil_tag('strong', array(), $object_handle->renderLink());

	$attachment = id(new PhabricatorFileAttachmentQuery())
	->setViewer($viewer)
	->withObjectPHIDs(array($object->getPHID()))
	->withFilePHIDs(array($file_phid))
	->needFiles(true)
	->withVisibleFiles(true)
	->executeOne();
	if (!$attachment) {
	$body = pht(
	'The file %s is not attached to the object %s.',
	$file_link,
	$object_link);

	return $dialog->appendParagraph($body);
	}

	$mode_reference = PhabricatorFileAttachment::MODE_REFERENCE;
	if ($attachment->getAttachmentMode() === $mode_reference) {
	$body = pht(
	'The file %s is referenced by the object %s, but not attached to '.
	'it, so it can not be detached.',
	$file_link,
	$object_link);

	return $dialog->appendParagraph($body);
	}

	if (!$attachment->canDetach()) {
	$body = pht(
	'The file %s can not be detached from the object %s.',
	$file_link,
	$object_link);

	return $dialog->appendParagraph($body);
	}

	if (!$request->isDialogFormPost()) {
	$dialog->appendParagraph(
	pht(
	'Detach the file %s from the object %s?',
	$file_link,
	$object_link));

	$dialog->addSubmitButton(pht('Detach File'));

	return $dialog;
	}

	if (!($object instanceof PhabricatorApplicationTransactionInterface)) {
	$dialog->appendParagraph(
	pht(
	'This object (of class "%s") does not implement the required '.
	'interface ("%s"), so files can not be manually detached from it.',
	get_class($object),
	'PhabricatorApplicationTransactionInterface'));

	return $dialog;
	}

	$editor = $object->getApplicationTransactionEditor()
	->setActor($viewer)
	->setContentSourceFromRequest($request)
	->setContinueOnNoEffect(true)
	->setContinueOnMissingFields(true);

	$template = $object->getApplicationTransactionTemplate();

	$xactions = array();

	$xactions[] = id(clone $template)
	->setTransactionType(PhabricatorTransactions::TYPE_FILE)
	->setNewValue(
	array(
	$file_phid => PhabricatorFileAttachment::MODE_DETACH,
	));

	$editor->applyTransactions($object, $xactions);

	return $this->newRedirect()
	->setURI($cancel_uri);
	}

	}

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