This is somewhat hacky, in that in order to do what we're doing, we
need to parse the HTML of the rendered page to extract the first
paragraph to include in the open graph description field. But
BeautifulSoup does a good job of it.
This carries a nontrivial performance penalty for loading these pages,
but overall /help/ is a low-traffic site compared to the main app, so
it doesn't matter much.
(As a sidenote, it wouldn't be a bad idea to cache this stuff).
There's lots of things we can improve in this, largely through editing
the articles, but we can deal with that over time.
Thanks to Rishi for writing all the tests.
This change lets us eliminate the need for new authentication backends
to edit get_auth_backends_data, since we're just computing it from the
official registry in zproject/backends.py. Should save a few lines of
work whenever we add a new auth backend, and make that more accessible
to new contributors.
This adds a new realm_logo field, which is a horizontal-format logo to
be displayed in the top-left corner of the webapp, and any other
places where we might want a wide-format branding of the organization.
Tweaked significantly by tabbott to rebase, fix styling, etc.
Fixing the styling of this feature's loading indicator caused me to
notice the loading indicator for the realm_icon feature was also ugly,
so I fixed that too.
Fixes#7995.
It appears that our i18n logic was only using the recipient's language
for logged-in emails, so even properly tagged for translation and
translated emails for functions like "Find my team" and "password
reset" were being always sent in English.
With great work by Vishnu Ks on the tests and the to_emails code path.
This should make it possible for blueslip error reports to be sent on
our logged-out portico pages, which should in turn make it possible to
debug any such issues as they occur.
Apparently, while the main code path through
login_or_register_remote_user was correctly calling
remote_user_to_email(username) to get a proper email address for
situations where auth username != email (i.e. when SSO_APPEND_DOMAIN
is set), we neglected to do so in the mobile_flow_otp corner case.
Fixes#11005.
Also, add a new notification sound, "ding". It comes from
https://freesound.org, where the original Zulip notification sound comes
from as well. In the future, new sounds can be added by adding audio
files to the `static/audio/notification_sounds` directory.
Tweaked significantly by tabbott:
* Avoided removing static/audio/zulip.ogg, because that file is
checked for by old versions of the desktop app.
* Added a views check for the sound being valid + tests.
* Added additional tests.
* Restructured the test_events test to be cleaner.
* Removed check_bool_or_string.
* Increased max length of notification_sound.
* Provide available_notification_sounds in events data set if global
notifications settings are requested.
Fixes#8051.
A key part of this is the new helper, get_user_by_delivery_email. Its
verbose name is important for clarity; it should help avoid blind
copy-pasting of get_user (which we'll also want to rename).
Unfortunately, it requires detailed understanding of the context to
figure out which one to use; each is used in about half of call sites.
Another important note is that this PR doesn't migrate get_user calls
in the tests except where not doing so would cause the tests to fail.
This probably deserves a follow-up refactor to avoid bugs here.
This is preparatory work for settings controlling who can see user
emails; it includes the API-level support for editing it, but no code
to actually enforce the policy.
This release is from 2018-08-22, a little over 100 days ago.
It was the first release with the important fix so that when the
server advises it to stop displaying a notification because the user
has read the message (as the SEND_REMOVE_PUSH_NOTIFICATIONS server
setting enables), the app doesn't instead replace the notification
with a broken one reading "null". We have that setting running now
on chat.zulip.org, and intend to roll it out more broadly soon.
The `# take 0` thing is a slightly absurd workaround for the fact
that our funky out-of-line way of marking lines to ignore doesn't
work right if there are multiple such lines in a given file that
are equal modulo leading and trailing whitespace.
This adds a function that sends provided email to all administrators
of a realm, but in a single email. As a result, send_email now takes
arguments to_user_ids and to_emails instead of to_user_id and
to_email.
We adjust other APIs to match, but note that send_future_email does
not yet support the multiple recipients model for good reasons.
Tweaked by tabbott to modify `manage.py deliver_email` to handle
backwards-compatibily for any ScheduledEmail objects already in the
database.
Fixes#10896.
While this would never happen for a real article, this prevents a 500
in this case for a situation which is definitely user error and should
be a 40x (in this case, 404).
As part of this, we refactor the main view code to do validation in a
single code path, since the semi-duplicated-in-3-places logic was
getting pretty buggy.
This is the first step of letting users use Zulip markdown in their
SHORT_TEXT and LONG_TEXT custom profile fields, so that they can
include emphasis, links, etc.
This doesn't include any frontend logic yet, however.
This library was absolutely essential as part of our Python 2->3
migration process, but all of its calls should be either no-ops or
encode/decode operations.
Note also that the library has been wrong since the incorrect
refactoring in 1f9244e060.
Fixes#10807.
This adds a web flow and management command for reactivating a Zulip
organization, with confirmation from one of the organization
administrators.
Further work is needed to make the emails nicer (ideally, we'd send
one email with all the admins on the `To` line, but the `send_email`
library doesn't support that).
Fixes#10783.
With significant tweaks to the email text by tabbott.
We're trying to sweep "subject" out of the codebase,
even when it has nothing to do our legacy "subject"
field. The rewording here will prevent some linter
noise.
We start by including functions that do custom
queries for topic history.
The goal of this library is partly to quarantine
the legacy "subject" column on Message.
This is a preparator refactor for supporting hosting different Tornado
processes on different servers; to look up which Tornado server we
should be sending the event to, we'll need the realm object.
This supports guest user in the user-info-form-modal as well as in the
role section of the admin-user-table.
With some fixes by Tim Abbott and Shubham Dhama.
The purpose of this commit is to pass information
to the frontend whether the message response recieved
has been limited due to plan restrictions or not.
To implement this, the backend for limiting the message
history had to be rewritten as we used to fetch
only the message rows whose id was greater than
first_visible_message_id. The filtered rows gives us
no information on whether the message history was
limited or not. So the backend was rewritten to not
do any restriction of limiting the message rows while
making the query. The limiting of rows is now done in
post_process_limited_query which will also return back
the value of history_limited flag.
Tweaked by tabbott to note a few cases where the results are
incorrect. I'm merging this despite those, because those cases don't
impact the correctness of the feature, and it may have tricky
performance implications to fix correctly.
Bots are not allowed to use the same name as
other users in the realm (either bot or human).
This is kind of a big commit, but I wanted to
combine the post/patch (aka add/edit) checks
into one commit, since it's a change in policy
that affects both codepaths.
A lot of the noise is in tests. We had good
coverage on the previous code, including some places
like event testing where we were expediently
not bothering to use different names for
different bots in some longer tests. And then
of course I test some new scenarios that are relevant
with the new policy.
There are two new functions:
check_bot_name_available:
very simple Django query
check_change_bot_full_name:
this diverges from the 3-line
check_change_full_name, where the latter
is still used for the "humans" use case
And then we just call those in appropriate places.
Note that there is still a loophole here
where you can get two bots with the same
name if you reactivate a bot named Fred
that was inactive when the second bot named
Fred was created. Also, we don't attempt
to fix historical data. So this commit
shouldn't be considered any kind of lockdown,
it's just meant to help people from
inadvertently creating two bots of the same
name where they don't intend to. For more
context, we are continuing to allow two
human users in the same realm to have the
same full name, and our code should generally
be tolerant of that possibility. (A good
example is our new mention syntax, which disambiguates
same-named people using ids.)
It's also worth noting that our web app client
doesn't try to scrub full_name from its payload in
situations where the user has actually only modified other
fields in the "Edit bot" UI. Starting here
we just handle this on the server, since it's
easy to fix there, and even if we fixed it in the web
app, there's no guarantee that other clients won't be
just as brute force. It wasn't exactly broken before,
but we'd needlessly write rows to audit tables.
Fixes#10509
Currently, if there is only one admin in realm and admin tries
to updates any non-adminuser's full name it throws error,
"Cannot remove only realm admin". Because in `/json/users/<user_id>`
api check_if_last_admin_is_changed is checked even if property
is_admin is not changed.
This commit fix this issue and add tests for it.
These lazy imports save a significant amount of time on Zulip's core
import process, because mock imports pbr, which in turn import
pkgresources, which is in turn incredibly slow to import.
Fixes part of #9953.
Before, presence information for an entire realm could only be queried via
the `POST /api/v1/users/me/presence` endpoint. However, this endpoint also
updates the presence information for the user making the request. Therefore,
bot users are not allowed to access this endpoint because they don't have
any presence data.
This commit adds a new endpoint `GET /api/v1/realm/presence` that just
returns the presence information for the realm of the caller.
Fixes#10651.
If cordelia searches on pm-with:iago@zulip.com,cordelia@zulip.com,
we now properly treat that the same way as pm-with:iago@zulip.com.
Before this fix, the query would initially go through the
huddle code path. The symptom wasn't completely obvious, as
eventually a deeper function would return a recipient id
corresponding to a single PM with @iago@zulip.com, but we would
only get messages where iago was the recipient, and not any
messages where he was the sender to cordelia.
I put the helper function for this in zerver/lib/addressee, which
is somewhat speculative. Eventually, we'll want pm-with queries
to allow for user ids, and I imagine there will be some shared
logic with other Addressee code in terms of how we handle these
strings. The way we deal with lists of emails/users for various
endpoints is kind of haphazard in the current code, although
granted it's mostly just repeating the same simple patterns. It
would be nice for some of this code to converge a bit. This
affects new messages, typing indicators, search filters, etc.,
and some endpoints have strange legacy stuff like supporting
JSON-encoded lists, so it's not trivial to clean this up.
Tweaked by tabbott to add some additional tests.
This is a preparatory commit for upcoming changes to move
/avatar/ to be a logged in or API accessible endpoint.
Basically we rename this variable because the new name is more
appropriate in the situation. Also user_profile will be used to
hold the user_profile of person accessing the endpoint in coming up
commit.
Tweaked by tabbott to use a declared constant rather than just use
5000 in multiple places; this also means we can change the count
without updating translations.
Fixes#10446.
The `match_subject` field is supposed to contain HTML; that's how
the highlighting is done. But the `subject` field is plain text --
it must be encoded if we want corresponding HTML.
Of the three places the `match_subject` field is populated -- two
here in messages_in_narrow_backend, one in get_messages_backend --
two of them already do this correctly, via get_search_fields.
Fix the remaining one, where in a `/messages/matches_narrow` query
we populate `matches_subject` even if the query didn't involve a
full-text search.
This doesn't affect the webapp, which ignores `match_subject` unless
it knows it did a full-text search; nor the mobile app, which
doesn't use `/messages/matches_narrow` at all.
This adds a feature in the "Notification" section of "Settings" tab,
which lets user enable or disable login emails notification.
Tweaked by tabbott to simplify the test.
Fixes: #5795, progress towards #5854.
In user type custom field, field value is list of user ids. We weren't
converting list to json object in update event payload. This throws
error in frontend, cause we store stringify representation of custom
field value. Therefore, after update event is recieved field-value-
type gets updated to array from string which throws json parsing error.
We've been getting reports from users that our Freshdesk webhook
isn't working correctly. It turns out that the issue had nothing
to do with the webhook implementation itself!
In freshdesk/doc.md, we have a JSON template we ask users to
copy/paste into a textbox in the Freshdesk UI. That JSON template
contains "{{" and "}}" characters which we escaped as Unicode
decimals to prevent clashes with Jinja2 syntax in other parts
of the same template. This worked for a while!
But thanks to the changes introduced as part of the
nested_code_blocks extension, such escaped characters were never
decoded, leading users to copy/paste the same template but with
raw escaped unicode representations of "{{" and "}}" inside. And
that eventually broke our webhook implementation.
This commit makes sure that such characters are properly "unescaped",
just for Freshdesk docs.
If `TEXT_EMOJISET` is currently selected emojiset then fallback to
`GOOGLE_EMOJISET` for displaying emojis in emoji picker and
composebox typeahead. We should pre-load the spritesheets in`emoji.js`
even in case of text emojiset otherwise on slow networks emoji picker
will appear empty initially.
Issue: When you created a new organization with /new, the "new login"
emails were emailed. We previously had a hack of adding the
.just_registered property to the user Python object to attempt to
prevent the emails, and checking that in zerver/signals.py. This
commit gets rid of the .just_registered check.
Instead of the .just_registered check, this checks if the user has
joined more than a minute before.
A test test_dont_send_login_emails_for_new_user_registration_logins
already exists.
Tweaked by tabbott to introduce the constant JUST_CREATED_THRESHOLD.
Fixes#10179.
Right now it only has one function, but the function
we removed never really belonged in actions.py, and
now we have better test coverage on actions.py, which
is an important module to get to 100%.
This implements a significant performance optimization for users
clicking the `Private messages` narrow in the Zulip UI, especially for
those users who do not have 50 recent private messages in an
organization with a lot of stream message traffic (because then
previously, postgres needed to scan through a huge amount of history
to find enough private messages).
The database index powering it can also support many other queries we
might want to do in the future to support "recent conversations" type
features.
Fixes#6896.
Since otp_encrypt_api_key only encrypts API keys, it doesn't require
access to the full UserProfile object to work properly. Now the
parameter it accepts is just the API key.
This is preparatory refactoring for removing the api_key field on
UserProfile.
random_api_key, the function we use to generate random tokens for API
keys, has been moved to zerver/lib/utils.py because it's used in more
parts of the codebase (apart from user creation), and having it in
zerver/lib/create_user.py was prone to cyclic dependencies.
The function has also been renamed to generate_api_key to have an
imperative name, that makes clearer what it does.
Now reading API keys from a user is done with the get_api_key wrapper
method, rather than directly fetching it from the user object.
Also, every place where an action should be done for each API key is now
using get_all_api_keys. This method returns for the moment a single-item
list, containing the specified user's API key.
This commit is the first step towards allowing users have multiple API
keys.
Importing the Django test client is somewhat expensive, and we only
use it within one view function that's not used in production. So
there's a significant startup-time performance optimization in doing
an import inside the view code.
The use_first_unread_anchor parameter allows automatically setting the
anchor to the first message that hasn't been read in this narrow.
Therefore it isn't necessary to specify an anchor when this parameter is
enabled.
Note from Tim: Arguably, we should think about making
`use_first_unread_anchor` the default behavior when anchor is
unspecified, but that's for later consideration.
This fixes a bug where administrators couldn't remove private
unsubscribed streams from the "default streams" list, because
access_stream_by_name didn't give them access to the stream object.
This renames Realm.restricted_to_domain field to
emails_restricted_to_domains, for greater clarity as to what it does
just from seeing the setting name, without having to look it up.
Fixes part of #10042.
It's sorta an unusual state to get into, to have a user own a
deactivated bot, when they can't create a bot of that type, but
definitely a valid possibility that we should be checking for.
Fixes#10087.
This setting isn't intended to exist long term, but instead to make it
possible to merge our search pills code before we're ready to cut over
production environments to use it.
Various pieces of our thumbor-based thumbnailing system were already
merged; this adds the remaining pieces required for it to work:
* a THUMBOR_URL Django setting that controls whether thumbor is
enabled on the Zulip server (and if so, where thumbor is hosted).
* Replaces the overly complicated prototype cryptography logic
* Adds a /thumbnail endpoint (supported both on web and mobile) for
accessing thumbnails in messages, designed to support hosting both
external URLs as well as uploaded files (and applying Zulip's
security model for access to thumbnails of uploaded files).
* Modifies bugdown to, when THUMBOR_URL is set, render images with the
`src` attribute pointing /thumbnail (to provide a small thumbnail
for the image), along with adding a "data-original" attribute that
can be used to access the "original/full" size version of the image.
There are a few things that don't work quite yet:
* The S3 backend support is incomplete and doesn't work yet.
* The error pages for unauthorized access are ugly.
* We might want to rename data-original and /thumbnail?size=original
to use some other name, like "full", that better reflects the fact
that we're potentially not serving the original image URL.
In this commit we add a new endpoint so as to have a way of fetching
topic history for a given stream id without having to be logged in.
This can only happen if the said stream is web public otherwise we
just return an empty topics list. This endpoint is quite analogous
to get_topics_backend which is used by our main web app.
In this commit we also do a bit of duplication regarding the query
responsible for fetching all the topics from DB. Basically this
query is exactly the same as what we have in the
get_topic_history_for_stream function in actions.py. Basically
duplicating now is the right thing to do because this query is
really gonna change when we add another criteria for filtering
messages which is:
Only topics for messages which were sent during the period the
corresponding stream was web public should be returned.
Now when we will do this, the query will change and thus it won't
really be a code duplication!
POST and DELETE operations in /users/me/alert_words may leave the
user's list of alert words in an unknown state: POSTing adds words to a
list that the client may not know from the begining, and the same with
DELETE.
Replying with the current status of the alert words list is the best way
of letting the client alter the list and knowing its contents after
being updated with a single query.
This is especially useful taking into account that POSTing words that
were already present and DELETing non-existing words both produce a
successful response.
An extra test has been added to avoid leaving GET /users/me/alert_words
too untested.
Querying an endpoint with no information (thus a noop) and it producing
a successful response doesn't seem to be expected.
Given the case that the client makes such query with no content it will
probably be unintentional and the API should let them know about it.
This is all the plumbing that makes it possible to enable the
stream_email_notifications setting via the Zulip API. The flag still
doesn't do anything yet, but this is a nice checkpoint along the way
to implementing this feature.
Given that we allow adding emoji reactions by only using the
emoji_name, we should offer the same possibility for removing
reactions to make the experience for API clients not require looking
up emoji codes.
Since this is an additional optional parameter, this also preserves
backward compatibility.
Complete, correct implementations of Zulip's emoji reactions API need
to send both emoji_code and emoji_name in order to add a reaction;
this is important for corner cases around clicking on a reaction in a
message that was first reacted to a year ago, when the emoji
name->code mappings have changed for the given code point in the
intervening time.
However, for folks building tools using the Zulip API, that corner
case is not particularly common; as a result, it makes sense to offer
an interface that allows adding a reaction by only specifying the
emoji name.
This is why the only field that needs to be required is emoji_name,
which can now be mapped to a single emoji. Both fields will be
necessary when "voting" an old reaction, but since we stil allow
specifying the two of them, these changes offer retrocompatibility.
This adds a new settings, SOCIAL_AUTH_SUBDOMAIN, which specifies which
domain should be used for GitHub auth and other python-social-auth
backends.
If one is running a single-realm Zulip server like chat.zulip.org, one
doesn't need to use this setting, but for multi-realm servers using
social auth, this fixes an annoying bug where the session cookie that
python-social-auth sets early in the auth process on the root domain
ends up masking the session cookie that would have been used to
determine a user is logged in. The end result was that logging in
with GitHub on one domain on a multi-realm server like zulipchat.com
would appear to log you out from all the others!
We fix this by moving python-social-auth to a separate subdomain.
Fixes: #9847.
The only changes visible at the AST level, checked using
https://github.com/asottile/astpretty, are
zerver/lib/test_fixtures.py:
'\x1b\\[(1|0)m' ↦ '\\x1b\\[(1|0)m'
'\\[[X| ]\\] (\\d+_.+)\n' ↦ '\\[[X| ]\\] (\\d+_.+)\\n'
which is fine because re treats '\\x1b' and '\\n' the same way as
'\x1b' and '\n'.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
When GETting an unedited message's edit history, the server wasn't able
to reply properly and produced a 500 error.
Now when that happens, we return a message history that only contains
the original message.
We're adding more stream types, e.g. splitting private streams into
with/without shared history, adding publicly-archived streams, adding
announce-only streams, etc. So maintaining this text is going to get more
complicated over time.
Also, the right place to explain this stuff is in the stream header, or near
the z-in-a-circle.
This commit also adds translation tags to the messages.
Move the zcommands from '/views/messages.py' to
'/lib/zcommand'.
Also, move the zcommand tests from '/tests/test_messages.py'
to '/tests/test_zcommand'.
This adds a common function `access_user_by_id` to access user id
within same realm, complete with a full suite of unit tests.
Tweaked by tabbott to make the test much more readable.
These two slash commands now use zcommand to talk to
the server, so we have no Message overhead, and if you're
on a stream, you no longer spam people by accident.
The commands now also give reasonable messages
if you are already in the mode you ask for.
It should be noted that by moving these commands out of
widget.py, they are no longer behind the ALLOW_SUB_MESSAGES
setting guard.
This adds a /ping command that will be useful for users
to see what the round trip to the Zulip server is (including
only a tiny bit of actual server time to basically give a
200).
It also introduce the "/zcommand" endpoint and zcommand.js
module.
For some reason in my original version I was sending both
content and data to the client for submessage events,
where data === JSON.parse(content). There's no reason
to not just let the client parse it, since the client
already does it for data that comes on the original
message, and since we might eventually have non-JSON
payloads.
The server still continues to validate that the payload
is JSON, and the client will blueslip if the server
regressses and sends bad JSON for some reason.
We now have a simple algorithm: First, look at the URL path
(e.g. /de/, which is intended to be an override). Second, look at the
language the user has specified in their settings.
This adds a common function `access_bot_by_id` to access bot id within
same realm. It probably fixes some corner case bugs where we weren't
checking for deactivated bots when regenerating API keys.
Previously, if you had LDAPAuthBackend enabled, we basically blocked
any other auth backends from working at all, by requiring the user's
login flow include verifying the user's LDAP password.
We still want to enforce that in the case that the account email
matches LDAP_APPEND_DOMAIN, but there's a reasonable corner case:
Having effectively guest users from outside the LDAP domain.
We don't want to allow creating a Zulip-level password for a user
inside the LDAP domain, so we still verify the LDAP password in that
flow, but if the email is allowed to register (due to invite or
whatever) but is outside the LDAP domain for the organization, we
allow it to create an account and set a password.
For the moment, this solution only covers EmailAuthBackend. It's
likely that just extending the list of other backends we check for in
the new conditional on `email_auth_backend` would be correct, but we
haven't done any testing for those cases, and with auth code paths,
it's better to disallow than allow untested code paths.
Fixes#9422.
Previously, if both EmailAuthBackend and LDAPAuthBackend were enabled,
LDAP users could set a password using EmailAuthBackend and continue to
use that password, even if their LDAP account was later deactivated.
That configuration wasn't supported at all before, so this doesn't fix
a pre-existing security issue, but now that we're making that a valid
configuration, we need to cover this case.
This should make it easier for us to iterate on a less-dense Zulip.
We create two classes on body, less_dense_mode and more_dense_mode, so
that it's easy as we refactor to separate the two concepts from things
like colors that are independent.
API users, particularly bots, can now send a field
called "widget_content" that will be turned into
a submessage for the web app to look at. (Other
clients can still rely on "content" to be there,
although it's up to the bot author to make the
experience good for those clients as well.)
Right now widget_content will be a JSON string that
encodes a "zform" widget with "choices." Our first
example will be a trivia bot, where users will see
something like this:
Which fruit is orange in color?
[A] orange
[B] blackberry
[C] strawberry
The letters will be turned into buttons on the webapp
and have canned replies.
This commit has a few parts:
- receive widget_content in the request (simply
validating that it's a string)
- parse the JSON in check_message and deeply
validate its structure
- turn it into a submessage in widget.py
This commit adds a view which will be used to process login requests,
adds an AuthenticationTokenForm so that we can use TextField widget for
tokens, and activates two factor authentication code path whenever user
tries to login.
This should significantly improve the user experience for creating
additional accounts on zulipchat.com.
Currently, disabled in production pending some work on visual styling.
This query was incorreclty not checking whether a user was deactivated
before managing their subscriptions.
This isn't an important bug, but should prevent some weird corner
cases (like trying to send a notification PM to a deactivated user,
which fails).
We send add events on upload, update events when sending a message
referencing it, and delete updates on removal.
This should make it possible to do real-time sync for the attachments
UI.
Based in part on work by Aastha Gupta.
These decorators will be part of the process for disabling access to
various features for guest users.
Adding this decorator to the subscribe endpoint breaks the guest users
test we'd just added for the subscribe code path; we address this by
adding a more base-level test on filter_stream_authorization.
This removes a check on invite_only, that should have been a check on
history_public_to_subscribers. In addition to fixing a bug for zephyr
realms, it also makes "more topics" work correctly for realms using
the new settings for stream history being public to subscribers.
We haven't seen significant traffic from the legacy desktop app in
over a year, and users using it get a warning to upgrade since last
summer, so it's probably OK to stop providing special fonts for it.
This commit adds a new field history_public_to_subscribers to the
Stream model, which serves a similar function to the old
settings.PRIVATE_STREAM_HISTORY_FOR_SUBSCRIBERS; we still use that
setting as the default value for new streams to avoid breaking
backwards-compatibility for those users before we are ready with an
actual UI for users to choose directly.
This also comes with a migration to set the value of the new field for
existing streams with an algorithm matching that used at runtime.
With significant changes by Tim Abbott.
This is an initial part of our efforts on #9232.
The handlebars error message is just for the manual development
environment; this prevents the state of compiling handlebars templates
from run-dev.py from potentially causing the unit tests to fail.
Add realm setting to set time limit for message deleitng.
Set default value of message_content_delete_limit_seconds
to 600 seconds(10 min).
Thanks to Shubham Dhama for rebasing and reworking this. Some final
edits also done by Tim Abbott.
Fixes#7344.