Link reference provider preview - low quality YT preview thumbnail

[gerbrent]

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Summary

YouTube link previews in Talk can appear pixelated/stretched, esp when compared to the actual preview image on YouTube itself.

On YouTube:

In Talk:

our web guru @peterwebdesign adds:

I notice the image parsed is 168px wide but here in the chat message preview it gets stretched to 216px, that's why it gets very pixelated

Relevant URL:
https://www.youtube.com/playlist?list=PL4eBKdNy6FCHIvz0d-brugUyOXvXdacpf

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Talk app

Talk app version: (see apps admin page: /index.php/settings/apps)

Custom Signaling server configured: yes/no and version (see additional admin settings: /index.php/index.php/settings/admin/talk#signaling_server)

Custom TURN server configured: yes/no (see additional admin settings: /index.php/settings/admin/talk#turn_server)

Custom STUN server configured: yes/no (see additional admin settings: /index.php/settings/admin/talk#stun_server)

Browser

Microphone available: yes/no

Camera available: yes/no

Operating system: Windows/Ubuntu/...
Linux/openSUSE Tumbleweed

Browser name: Firefox/Chrome/...
Firefox

Browser version: 85/96/...
118.01

Browser log

``` Insert your browser log here, this could for example include: a) The javascript console log b) The network log c) ... ```

Server configuration

cloud.nextcloud.com

Operating system: Ubuntu/RedHat/...

Web server: Apache/Nginx

Database: MySQL/Maria/SQLite/PostgreSQL

PHP version: 8.0/8.1/8.2

Nextcloud Version: (see admin page)

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your server installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Server log (data/nextcloud.log)

Insert your server log here

[nickvergessen]

The preview is provided by the link reference provider.
And that one is utilizing the open graph data and there youtube seems to list multiple but the server is forwarding the first one:

[nickvergessen]

Basically both images[0] in this code should use the entry entry which has the best fitting size with them?

server/lib/private/Collaboration/Reference/LinkReferenceProvider.php

Lines 146 to 156 in a304ba5

	$host = parse_url($object->images[0]->url, PHP_URL_HOST);
	if ($host === false || $host === null) {
	$this->logger->warning('Could not detect host of open graph image URI for ' . $reference->getId());
	} else {
	$appData = $this->appDataFactory->get('core');
	try {
	$folder = $appData->getFolder('opengraph');
	} catch (NotFoundException $e) {
	$folder = $appData->newFolder('opengraph');
	}
	$response = $client->get($object->images[0]->url, ['timeout' => 10]);