[Feature] URL Preview

[krille-chan]

Description

URL Preview from Matrix API to show Image / Metadate of a linked URL.

Example: /_matrix/media/r0/preview_url?url=https%3A%2F%2Fmatrix.org&ts=1510610716656 HTTP/1.1

Output

{
  "og:title": "Matrix Blog Post",
  "og:description": "This is a really cool blog post from matrix.org",
  "og:image": "mxc://example.com/ascERGshawAWawugaAcauga",
  "og:image:type": "image/png",
  "og:image:height": 48,
  "og:image:width": 48,
  "matrix:image:size": 102400
}

[nebulade]

I guess this could also mean direct links to images would be shown? Then it may be a half-way solution for inline gifs even.

[BhasherBEL]

It would also be interesting to be able to disable this function, as vulnerabilities have recently been revealed using cloaking.

[cperrin88]

I think there is a property that can be set on a per room basis whether or not you want url previews.

[Mikaela]

• https://spec.matrix.org/latest/client-server-api/#get_matrixmediav3preview_url

Naturally the migration ate the spec link.

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It would also be interesting to be able to disable this function, as vulnerabilities have recently been revealed using cloaking.

What vulnerabilities and user cloaking are you referring to?

---

Note that URL previews shouldn't be performed on client side regardless of the insecurity nightmare Element is requested and performs.

• Option to generate URL previews at the receiving client, not the server element-hq/element-meta#1138 (comment)
• Please remove device model and detailed system version from the User-agent of Element's request element-hq/element-meta#2309
  • Add the FluffyChat name and version to the userAgent string #912

[yannikthegenius]

+1