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Update AppFiltering.md file 

Signed-off-by: Vitalii Koshura <lestat.de.lionkur@gmail.com>
Vitalii Koshura 2023-02-20 18:26:01 +01:00
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AppFiltering.md

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You can allow users to select which applications they will receive work for
(by default, they may receive work for any application).
# User app filtering
Each user's list of selected apps is stored in the [project-specific preferences](ProjectSpecificPrefs).
This is stored in the user.project_specific_prefs database field.
Each 'allowed' application is represented by an element `<app_id>N</app_id>`,
where N is the database ID of the application.
If no `<app_id>` elements are present, the user may be sent work for any application.
BOINC offers two mechanisms allowing users to control the set of apps for which they get jobs.
The first, described [here](BetaTest), lets you designate apps as "beta test", and lets users opt-in to getting jobs for these apps.
The second, "app filtering", lets users select apps individually.
This feature is disabled by default.
To enable it, edit your html/project/project_specific_prefs.inc to contain
App filtering is disabled by default.
To enable it, add to your html/project/project_specific_prefs.inc:
```
define ('APP_SELECT_PREFS', true);
```
define ('APP_SELECT_PREFS', true);
The app filtering user interface is part of [project-specific preferences](ProjectSpecificPrefs)
(i.e., the "Preferences for this project" link on their account page).
If the feature is enabled, users are shown:
* A list of apps and check boxes.
* A checkbox labeled "If no work for selected applications is available, accept work from other applications?".
Users can specify project preferences separately for each host "venue" (default, work, school, home),
allowing them to control which apps run on each host.
If no apps are selected, there is no restriction: the user can be sent jobs for any app.
When you first enable app filtering, no apps are selected.
Hence all users can get all apps.
Post a news item to notify users that app filtering is available.
# Defining default app selection
Suppose you want to define a default other than enabling all apps.
For new users you can do this by adding some lines to your
**html/project/project_specific_prefs.inc**:
```
function project_specific_prefs_default() {
... existing code
$x .= "<app_id>ID1</app_id>\n";
...
$x .= "<app_id>IDn</app_id>\n";
```
where ID1 ... IDn are the database IDs of the apps to enable by default.
This specifies default prefs for new users, but it doesn't affect existing users.
Setting prefs for existing users, *en masse*, will require some new code; ask David Anderson.
# Adding a new app
When you add a new app, it won't be sent to any users who have selected apps.
You can change this (i.e. add the new app to the prefs of users who have selected apps)
by running
app_select_edit.php ID
```
app_select_edit.php ID
```
in your html/ops directory (where ID is the database ID of the new app).
We recommend that you test this script for a few individual users
before running it on your whole database;
see the bottom of the script for details on how to do this.
# Warning
# Disabling app filtering
Once you use application filtering,
currently there is no easy way to cancel it:
users who have non-empty app lists will continue to
be filtered even if you remove app filtering from your PHP code.
The only ways to fully undo app filtering are:
Currently there's no way to disable app filtering;
if you undefine APP_SELECT_PREFS, the GUI will go away
but existing prefs will continue to be enforced.
To fix this we'll need to add a scheduler flag to disable app filtering;
if you need this, ask me (David Anderson).
# Implementation
Each user's list of selected apps is stored in the user.project_specific_prefs database field.
Each 'allowed' application is represented by an element ```<app_id>N</app_id>```,
where N is the database ID of the application.
* write a script to remove all <app_id> elements from the XML in the database
* modify the scheduler so that it takes a configuration flag turning off app filtering.