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Add readme bit on cross-origin renderer

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David Baker 2018-04-25 11:10:46 +01:00
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@ -49,6 +49,15 @@ We have put some coarse mitigations into place to try to protect against this
situation, but it's still not good practice to do it in the first place. See
https://github.com/vector-im/riot-web/issues/1977 for more details.
The same applies for end-to-end encrypted content, but since this is decrypted
on the client, Riot needs a way to supply the decrypted content from a separate
origin to the one Riot is hosted on. This currently done with a 'cross origin
renderer' which is a small piece of javascript hosted on a different domain.
To avoid all Riot installs needing one of these to be set up, riot.im hosts
one on usercontent.riot.im which is used by default. See 'config.json' if you'd
like to host your own. https://github.com/vector-im/riot-web/issues/6173 tracks
progress on replacing this with something better.
Building From Source
====================