Removes dependency on util.error from util.pubsub which was only used
for this one special case.
Line count reduction!
Would be even nicer if templating could be done by util.error itself.
This is what util.error was made for!
This replaces the custom error stanza builder with common code in
util.stanza that knows enough about util.error and namespaced errors.
Some awkwardness remains in the way util.pubsub returns conflicting
form fields.
This enables granting regular users permission to create nodes via the
new roles framework. Previously this required either making everyone an
admin or writing a custom mod_pubsub variant with different permission
details.
Previous default behavior of only allowing creation by admin is kept as
to not give out unexpected permissions on upgrade, but could be
reevaluated at a later time.
Fixes#1324
Allows e.g. restricting your vcard4 to only family or similar.
Notes: This does not include roster groups in the configuration form,
so the client will have to get them from the actual roster.
Gives some access to node details which are otherwise hard to determine
if you only see the plain text summary, since it is shared based on the
pubsub#type setting (or payload xmlns).
Many of these fall into a few categories:
- util.cache size, must be >= 1
- byte or item counts that logically can't be negative
- port numbers that should be in 1..0xffff
This matches ejabberd's behaviour, using the 'pubsub#itemreply' config option.
Although the current definition of this option in the specification is not
as clear as it could be, I think matching what existing deployments do is the
best option to resolve the ambiguity and reduce fragmentation.
We should update the spec to be clearer about how to use and interpret this
option.
The 'expose_publisher' option for mod_pubsub is now an override (always expose
or never expose). If unset, it will use the per-node config (which defaults to
not exposing).
Thanks to Link Mauve, edhelas and goffi for sparking this feature.
We began moving away from simple "is this user an admin?" permission checks
before 0.12, with the introduction of mod_authz_internal and the ability to
dynamically change the roles of individual users.
The approach in 0.12 still had various limitations however, and apart from
the introduction of roles other than "admin" and the ability to pull that info
from storage, not much actually changed.
This new framework shakes things up a lot, though aims to maintain the same
functionality and behaviour on the surface for a default Prosody
configuration. That is, if you don't take advantage of any of the new
features, you shouldn't notice any change.
The biggest change visible to developers is that usermanager.is_admin() (and
the auth provider is_admin() method) have been removed. Gone. Completely.
Permission checks should now be performed using a new module API method:
module:may(action_name, context)
This method accepts an action name, followed by either a JID (string) or
(preferably) a table containing 'origin'/'session' and 'stanza' fields (e.g.
the standard object passed to most events). It will return true if the action
should be permitted, or false/nil otherwise.
Modules should no longer perform permission checks based on the role name.
E.g. a lot of code previously checked if the user's role was prosody:admin
before permitting some action. Since many roles might now exist with similar
permissions, and the permissions of prosody:admin may be redefined
dynamically, it is no longer suitable to use this method for permission
checks. Use module:may().
If you start an action name with ':' (recommended) then the current module's
name will automatically be used as a prefix.
To define a new permission, use the new module API:
module:default_permission(role_name, action_name)
module:default_permissions(role_name, { action_name[, action_name...] })
This grants the specified role permission to execute the named action(s) by
default. This may be overridden via other mechanisms external to your module.
The built-in roles that developers should use are:
- prosody:user (normal user)
- prosody:admin (host admin)
- prosody:operator (global admin)
The new prosody:operator role is intended for server-wide actions (such as
shutting down Prosody).
Finally, all usage of is_admin() in modules has been fixed by this commit.
Some of these changes were trickier than others, but no change is expected to
break existing deployments.
EXCEPT: mod_auth_ldap no longer supports the ldap_admin_filter option. It's
very possible nobody is using this, but if someone is then we can later update
it to pull roles from LDAP somehow.
Sometimes you only care about a single attribute, but the child tag
itself may be optional, leading to needing `tag and tag.attr.foo` or
`stanza:find("tag@foo")`.
The `:find()` method is fairly complex, so avoiding it for this kind of
simpler use case is a win.
In this case `ret` is a table not containing the node, which makes
pubsub_error_reply() try to get an error template with that `ret` table
as index, which returns a `nil` then passed to table.unpack, which in
turn throws the error.
Clients would generally be using the "max" symbol instead of discovering
this, but this also gets us validation and earlier rejection of out of
bounds values.
Default left as 'never' in mod_pubsub to preserve the previous behavior.
Unclear if this is desirable, but can always be changed later.
In mod_pep this allows turning off the automatic resending of most
recent item.
Examples in XEP-0060 suggest that items should be listed in
chronological order, but we get them from the archive in reverse
order.
However when requesting specific items by id the results keep that
order and we don't want to flip it again.
At some point it would likely be best to use the archive API directly
instead of this util.cache-compatible wrapper.
This would also release any resources held via references from these
callbacks.
I'm not sure why we don't just re-new() the whole thing.
Related to #1382
Because of the way the previous pubsub service is carried access module
reloads, it would retain the configuration options with their previous
values from when the service was first created.
XEP-0060 says that this the way to indicate that 'persistent-items' is
unsupported, but doesn't explicitly say if it being disabled in the node
configuration also counts as unsupported.
Since nodes were always persistent according to the XEP-0060 definition.
Whether data is stored in memory or on disk was not what this setting
was meant for.
All the XEP-0060 examples have the publisher attribute set to a bare
JID, but the text does allow it to be the full JID.
Since mod_pubsub is more likely used for open nodes that anyone can
subscribe to it makes sense to not leak the full JIDs. This is also
disabled by defaults.
In mod_pep on the other hand it might make sense to have the full JID
since that data is more likely to be broadcast to contacts which are
already somewhat trusted.
