Link Previews: Owncloud link preview similar to DropBox link preview

Description

1. Try out DropBox link preview

a) Go to Account Settings > Advanced Settings > Preview pre-release features and click "Show preview snippet of links below message"

b) Post a Dropbox link with public permissions and observe is rendering

2. Implement a similar owncloud implementation

Here are places in the code to get started:

https://github.com/mattermost/platform/blob/master/web/react/components/providers.json#L111

https://github.com/mattermost/platform/blob/master/web/react/components/post_attachment_oembed.jsx

QA Test Steps

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Mana

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Assignee

Ian Tien

QA Assignee

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Reporter

Ian Tien

Epic Link

Fix versions

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Mattermost Team

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Sprint

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GitHub Issue

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Components

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