David Mudrák 39d2c68856 MDL-61742 messaging: Do not send messages from inactive providers
Before this patch, we only checked that the given provider has been
configured in the user or system preferences. However, if the provider's
component is disabled, it does not even appear in these preferences.
Additionally, there was no check that the message / notification
provider is among providers allowed to be consumed by the recipient.

The patch checks that the message origin is among providers returned by
the message_get_providers_for_user() so disabled plugins can't act as
sources of messages and users can't receive messages from providers they
do not have capability for. This mitigates the risk of abusing a plugin
as a source of spam, for example.

Unit test is fixed and extended. When the $CFG->messaging is disabled,
no messages between users should be sent (I can't understand why the
unit test was written in an opposite way). Added assertions for the
raised debugging message.
2018-08-31 12:15:30 +02:00
..