feat: indicate if file has preview

[micbar]

Description

Indicate if a resource can render a thumbnail.

Context

We have different implementations of our thumbnail service which include capabilities for different formats.

This flag on the PROPFIND enables clients to see if a preview is available and can be reqested.

openCloud context

We have two thumbnailers:

1. Based on go only
2. Based on libvips bindings

The included mimetype list is different in the two build scenarios.

Examples

Request

curl --location --request PROPFIND 'https://cloud.opencloud.test:9200/remote.php/dav/spaces/storage-users-1%24some-admin-user-id-0000-000000000000/' \
--header 'Origin: https://localhost' \
--header 'Access-Control-Request-Method: PROPFIND' \
--header 'Depth: 1' \
--header 'Content-Type: application/xml' \
--header 'Authorization: ••••••' \
--data '<?xml version="1.0"?>
<d:propfind  xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns">
  <d:prop>
    <oc:permissions />
    <oc:favorite />
    <oc:fileid />
    <oc:owner-id />
    <oc:owner-display-name />
    <oc:share-types />
    <oc:privatelink />
    <d:getcontentlength />
    <oc:size />
    <d:getlastmodified />
    <d:getetag />
    <d:getcontenttype />
    <d:resourcetype />
    <oc:downloadURL />
    <oc:has-preview />
  </d:prop>
</d:propfind>'

Response

<d:multistatus xmlns:s="http://sabredav.org/ns" xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns">
    <d:response>
        <d:href>/remote.php/dav/spaces/storage-users-1$some-admin-user-id-0000-000000000000/</d:href>
        <d:propstat>
            <d:prop>
                <oc:permissions>RDNVCKZP</oc:permissions>
                <oc:favorite>0</oc:favorite>
                <oc:fileid>storage-users-1$some-admin-user-id-0000-000000000000!some-admin-user-id-0000-000000000000</oc:fileid>
                <oc:owner-id>admin</oc:owner-id>
                <oc:owner-display-name>Admin</oc:owner-display-name>
                <oc:privatelink>https://cloud.opencloud.test:9200/f/storage-users-1$some-admin-user-id-0000-000000000000%21some-admin-user-id-0000-000000000000</oc:privatelink>
                <oc:size>669301</oc:size>
                <d:getlastmodified>Fri, 16 May 2025 11:28:59 GMT</d:getlastmodified>
                <d:getetag>"c76ca7c79c3dc4691e8375945af9244e"</d:getetag>
                <d:resourcetype>
                    <d:collection/>
                </d:resourcetype>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
        <d:propstat>
            <d:prop>
                <oc:share-types></oc:share-types>
                <d:getcontentlength></d:getcontentlength>
                <d:getcontenttype></d:getcontenttype>
                <oc:downloadURL></oc:downloadURL>
                <oc:has-preview></oc:has-preview>
            </d:prop>
            <d:status>HTTP/1.1 404 Not Found</d:status>
        </d:propstat>
    </d:response>
    <d:response>
        <d:href>/remote.php/dav/spaces/storage-users-1$some-admin-user-id-0000-000000000000/New%20file.odp</d:href>
        <d:propstat>
            <d:prop>
                <oc:permissions>RDNVWZP</oc:permissions>
                <oc:favorite>0</oc:favorite>
                <oc:fileid>storage-users-1$some-admin-user-id-0000-000000000000!c1122547-f9c8-4c72-9b29-9e221acf0bf0</oc:fileid>
                <oc:owner-id>admin</oc:owner-id>
                <oc:owner-display-name>Admin</oc:owner-display-name>
                <oc:privatelink>https://cloud.opencloud.test:9200/f/storage-users-1$some-admin-user-id-0000-000000000000%21c1122547-f9c8-4c72-9b29-9e221acf0bf0</oc:privatelink>
                <d:getcontentlength>0</d:getcontentlength>
                <oc:size>0</oc:size>
                <d:getlastmodified>Mon, 12 May 2025 16:09:08 GMT</d:getlastmodified>
                <d:getetag>"d433d313b888ff632374156220a708d6"</d:getetag>
                <d:getcontenttype>application/vnd.oasis.opendocument.presentation</d:getcontenttype>
                <d:resourcetype></d:resourcetype>
                <oc:has-preview>0</oc:has-preview>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
        <d:propstat>
            <d:prop>
                <oc:share-types></oc:share-types>
                <oc:downloadURL></oc:downloadURL>
            </d:prop>
            <d:status>HTTP/1.1 404 Not Found</d:status>
        </d:propstat>
    </d:response>
    <d:response>
        <d:href>/remote.php/dav/spaces/storage-users-1$some-admin-user-id-0000-000000000000/sample1.webp</d:href>
        <d:propstat>
            <d:prop>
                <oc:permissions>RDNVWZP</oc:permissions>
                <oc:favorite>0</oc:favorite>
                <oc:fileid>storage-users-1$some-admin-user-id-0000-000000000000!9c5bb639-1289-444f-89fa-cc7655e31591</oc:fileid>
                <oc:owner-id>admin</oc:owner-id>
                <oc:owner-display-name>Admin</oc:owner-display-name>
                <oc:privatelink>https://cloud.opencloud.test:9200/f/storage-users-1$some-admin-user-id-0000-000000000000%219c5bb639-1289-444f-89fa-cc7655e31591</oc:privatelink>
                <d:getcontentlength>658538</d:getcontentlength>
                <oc:size>658538</oc:size>
                <d:getlastmodified>Mon, 12 May 2025 14:32:25 GMT</d:getlastmodified>
                <d:getetag>"768c1e2e621de08c815644f45029171c"</d:getetag>
                <d:getcontenttype>image/webp</d:getcontenttype>
                <d:resourcetype></d:resourcetype>
                <oc:has-preview>1</oc:has-preview>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
        <d:propstat>
            <d:prop>
                <oc:share-types></oc:share-types>
                <oc:downloadURL></oc:downloadURL>
            </d:prop>
            <d:status>HTTP/1.1 404 Not Found</d:status>
        </d:propstat>
    </d:response>
    <d:response>
        <d:href>/remote.php/dav/spaces/storage-users-1$some-admin-user-id-0000-000000000000/400px-Docker-compose-logo.jpg</d:href>
        <d:propstat>
            <d:prop>
                <oc:permissions>RDNVWZP</oc:permissions>
                <oc:favorite>0</oc:favorite>
                <oc:fileid>storage-users-1$some-admin-user-id-0000-000000000000!9a4cba30-9062-4705-a88b-a33916930fc6</oc:fileid>
                <oc:owner-id>admin</oc:owner-id>
                <oc:owner-display-name>Admin</oc:owner-display-name>
                <oc:privatelink>https://cloud.opencloud.test:9200/f/storage-users-1$some-admin-user-id-0000-000000000000%219a4cba30-9062-4705-a88b-a33916930fc6</oc:privatelink>
                <d:getcontentlength>10763</d:getcontentlength>
                <oc:size>10763</oc:size>
                <d:getlastmodified>Mon, 05 May 2025 15:47:09 GMT</d:getlastmodified>
                <d:getetag>"694a946694796435f72fbd8c7240ea13"</d:getetag>
                <d:getcontenttype>image/jpeg</d:getcontenttype>
                <d:resourcetype></d:resourcetype>
                <oc:has-preview>1</oc:has-preview>
            </d:prop>
            <d:status>HTTP/1.1 200 OK</d:status>
        </d:propstat>
        <d:propstat>
            <d:prop>
                <oc:share-types></oc:share-types>
                <oc:downloadURL></oc:downloadURL>
            </d:prop>
            <d:status>HTTP/1.1 404 Not Found</d:status>
        </d:propstat>
    </d:response>
</d:multistatus>

[rhafer]

I am not really happy that we add yet another reva -> opencloud depency here, but I am also lacking some better idea currently.

[micbar]

I am not really happy that we add yet another reva -> opencloud depency here, but I am also lacking some better idea currently.

I spoke with @aduffeck We can shift the mimetypes map to reva.

[rhafer]

I spoke with @aduffeck We can shift the mimetypes map to reva.

Can we? The defaults for SupportedMimeTypes depend on the selected thumbnailing backend (vips vs. native go) in the thumbnails service. Moving that to reva would mean that we need some kind of manual configuration without good default. I might be misunderstanding the proposal.

[db-ot]

related WEB-UI TIcket opencloud-eu/web#864

[micbar]

@rhafer Rebased and cleaned up the go deps.

[guruz]

Please also create mobile client follow-up issues when you create a new feature in server, not only web UI :)

Android here: opencloud-eu/android#217
iOS will follow.