David Mehren f552b14e11 Sanitize username and photo URL ...

HedgeDoc displays the username and user photo at various places
by rendering the respective variables into an `ejs` template.
As the values are user-provided or generated from user-provided data,
it may be possible to inject unwanted HTML.

This commit sanitizes the username and photo URL by passing them
through the `xss` library.

Co-authored-by: Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
Signed-off-by: David Mehren <git@herrmehren.de>

2021-05-09 19:28:44 +02:00

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