expose gps data via webdav

[tobiasKaminsky]

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Add file-metadata WebDAV properties documentation#10957
• Backports requested where applicable (ex: critical bugfixes)

[AndyScherzinger]

/backport to stable-27.1

[Altahrim]

Maybe just:

Suggested change

	return json_encode((object)[], JSON_THROW_ON_ERROR);
	return '{}';

[AndyScherzinger]

I guess it is a one-to-one replication of the code for files-metadata-size, so I would keep it as-is.

[susnux]

Do not forget to add the prop to the documentation here:

https://github.com/nextcloud/documentation/blob/master/developer_manual/client_apis/WebDAV/basic.rst#supported-properties

[AndyScherzinger]

Do not forget to add the prop to the documentation here:

@tobiasKaminsky I created the documentation PR, while it is lacking the examples, maybe you can add them? nextcloud/documentation#10957

[icewind1991]

please also adjust the bulk-loading logic from

server/apps/dav/lib/Connector/Sabre/FilesPlugin.php

Lines 469 to 478 in 1a6709c

	$metadataManager = \OC::$server->get(IMetadataManager::class);
	$preloadedMetadata = $metadataManager->fetchMetadataFor('size', $fileIds);
	foreach ($node->getChildren() as $child) {
	/** @var \OCP\Files\Node|Node $child */
	if (str_starts_with($child->getFileInfo()->getMimeType(), 'image')) {
	/** @var File $child */
	$child->setMetadata('size', $preloadedMetadata[$child->getFileInfo()->getId()]);
	}
	}
	}

to ensure this doesn't because a significant performance issue

[icewind1991]

Added the pre-loading and de-duplicated some logic

[backportbot-nextcloud]

The backport to stable-27.1 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-27.1
git pull origin stable-27.1

# Create the new backport branch
git checkout -b fix/foo-stable-27.1

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable-27.1

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[icewind1991]

/backport to stable27