# Notifications system

LemonLDAP::NG can be used to notify some messages to users. If a user has got some messages, they will be displayed when he access to the portal. If a message contains some check boxes, the user has to check all of them else he can not access to the portal and retrieves his session cookie.

A notification explorer is available in Manager, and notifications can be set for all users, with possibility to use display conditions. When the user accept the notification, notification reference is stored in his persistent session.

## Installation

### Activation

You just have to activate Notifications in the Manager (General Parameters > Advanced Parameters > Notifications > Activation)

or in `lemonldap-ng.ini` [portal] section:

    [portal]
    notification = 1

### Explorer

Notifications explorer allows users to see and display theirs accepted notifications. Disable by default, you just have to activate it in the Manager (General Parameters > Advanced Parameters > Notifications > Explorer)

or in `lemonldap-ng.ini` [portal] section:

    [portal]
    notificationsExplorer = 1

By default, just the three last notifications are displayed. You can modify this by editing `lemonldap-ng.ini` [portal] section:

    [portal]
    notificationsMaxRetrieve = 3

#### Usage

When enabled, `/mynotifications` URL path is handled by this plugin.

#### Known issue

An XML document can contain several notifications messages. Just the first one can be searched and displayed!

Listed notifications are extracted from users persistent session (notification reference and accepted date). ONLY the notifications explorer can found in notifications backend are available to be displayed. Notifications content (title, subtitle and so on...) is not stored into persistent session.

### Storage

By default, notifications will be stored in the same database as configuration:

- if you use "File" system and your "dirName" is set to /usr/local/lemonldap-ng/conf/, the notifications will be stored in /usr/local/lemonldap-ng/notifications/
- if you use "CDBI" or "RDBI" system, the notifications will be stored in the same database as configuration and in a table named "notifications".
- if you use "LDAP" system, the notifications will be stored in the same directory as configuration and in a branch named "notifications".

You can change default parameters using the "notificationStorage" and "notificationStorageOptions" parameters with the same syntax as configuration storage parameters. To do this in Manager, go in General Parameters > Advanced Parameters > Notifications.

#### File

Parameters for File backend are the same as File configuration backend.

You need to create yourself the directory and set write access to Apache user. For example:

    mkdir /usr/local/lemonldap-ng/notifications/
    chown www-data /usr/local/lemonldap-ng/notifications/

The file name default separator is `_`, this can be a problem if you register notifications for users having `_` in their login. You can change the separator with the `fileNameSeparator` option, and set another value, for example `@`.

To summary available options:

- dirName: directory where notifications are stored.
- fileNameSeparator: file name separator.

#### DBI

Parameters for DBI backend are the same as DBI configuration backend.

You have to create the table by yourself:

    CREATE TABLE notifications (
      DATE datetime NOT NULL,
      uid VARCHAR(255) NOT NULL,
      REF VARCHAR(255) NOT NULL,
      cond VARCHAR(255) DEFAULT NULL,
      xml longblob NOT NULL,
      done datetime DEFAULT NULL,
      PRIMARY KEY (DATE, uid,REF)
    )

To summary available options:

- dbiChain: DBI connection.
- dbiUser: DBI user.
- dbiPassword: DBI password.
- dbiTable: Notifications table name.

#### LDAP

Parameters for LDAP backend are the same as LDAP configuration backend.

You have to create the branch by yourself

To summary available options:

- ldapServer: LDAP URL.
- ldapBindDN: LDAP user.
- ldapBindPassword: LDAP password.
- ldapConfBase: Notifications branch DN.

DBI configuration example:

    notificationStorage = DBI
    notificationStorageOptions={  \
        'dbiChain'    => 'DBI:Pg:dbname=llng;host=mabdd;port=5432', \
        'dbiTable'    => 'notifications', \
        'dbiUser'     => 'user', \
        'dbiPassword' => 'qwerty', \
        'type'        => 'CDBI', \
    }

### Wildcard

The notifications module uses a wildcard to manage notifications for all users. The default value of this wildcard is `allusers`, but you can change it if `allusers` is a known identifier in your system.

To change it, go in General Parameters > Advanced Parameters > Notifications > Wildcard for all users, and set for example `alluserscustom`.

Then creating a notification for `alluserscustom` will display the notification for all users.

## Using notification system

Since version 2.0, notifications are now stored in JSON format. If you want to keep old format, select "use old format" in the Manager. Note that notification server depends on chosen format: REST for JSON and SOAP for XML.

### Notification format

Notifications are JSON (default) or XML files containing:

- <notification> element(s) :
  - Required attributes:
    - date: creation date (format YYYY-MM-DD WITHOUT time!)
    - ref: a reference that can be used later to know what has been notified and when (Avoid `_` character)
    - uid: the user login (it must correspond to the attribute set in whatToTrace parameter, uid by default), or the wildcard string (by default: `allusers`) if the notification should be displayed for every user.
  - Optional attributes:
    - condition: condition to display the notification, can use all session variables.
  - Sub elements:
    - <title>: title to display: will be inserted in HTML page enclosed in <h2 class="notifText">...</h2>
    - <subtitle>: subtitle to display: will be inserted in HTML page enclosed in <h2 class="notifText">...</h2>
    - <text>: paragraph to display: will be inserted in HTML page enclosed in <p class="notifText">...</p>
    - <check>: paragraph to display with a checkbox: will be inserted in HTML page enclosed in <p class="notifCheck"><input type="checkbox" />...</p>

All other elements will be removed including HTML elements like <b>.
One notification XML document can contain several notifications messages.

Several notifications can be inserted with a single request by using an array of JSON (Tested with an array of 10,000 elements)

#### Examples

##### JSON

    [{
    "uid": "foo",
    "date": "2009-01-27",
    "reference": "ABC",
    "title": "You have new authorizations",
    "subtitle": "Application 1",
    "text": "You have been granted to access to appli-1",
    # An array is required to set multi checkboxes
    "check": [
      "I agree",
      "Yes, I'm sure"
    ]
    },
    {
    "uid": "bar",
    "date": "2009-01-27",
    "reference": "ABC",
    "title": "You have new authorizations",
    "subtitle": "Application 1",
    "text": "You have been granted to access to appli-1",
    "check": "I agree"
    }] # No comma at the end

JSON format notifications are displayed sorted by date and reference

##### XML

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <root>
    <notification uid="foo.bar" date="2009-01-27" reference="ABC">
    <title>You have new authorizations</title>
    <subtitle>Application 1</subtitle>
    <text>You have been granted to access to appli-1</text>
    <subtitle>Application 2</subtitle>
    <text>You have been granted to access to appli-2</text>
    <subtitle>Acceptation</subtitle>
    <check>I know that I can access to appli-1 </check>
    <check>I know that I can access to appli-2 </check>
    </notification>
    <notification uid="allusers" date="2009-01-27" reference="disclaimer" condition="$ipAddr =~ /^192/">
    <title>This is your first access on this system</title>
    <text>Be a nice user and do not break it please.</text>
    <check>Of course I am not evil!</check>
    </notification>
    </root>

### Create new notifications with notifications explorer

In Manager, click on `Notifications` and then on the `Create` button.

Then fill all inputs to create the notification. Only the condition is not mandatory.

When all is ok, click on `Save`.

### Notification server

LemonLDAP::NG provides two notification servers : SOAP and REST depending on format.

If enabled, the server URL is https://auth.your.domain/notifications.

Notification server provides three API to insert (POST), delete (DELETE) or list (GET) notification(s).

Available options:

- Server: Enable/Disable notification server
- Default condition: Condition appended to ALL notifications inserted by notification server (JSON format only)
- Notification parameters to send: Notifications parameters returned by `GET` method
- HTTP methods: Enable/Disable HTTP methods

If notification server is enabled, you have to protect this URL by using the web server because there is no authentication required to use it.

Example:

    # REST/SOAP functions for insert/delete/list notifications (disabled by default)
    <LocationMatch ^/(index\.fcgi/)?notifications>
        <IfVersion >= 2.3>
            Require ip 192.168.2.0/24
        </IfVersion>
        <IfVersion < 2.3>
            Order Deny,Allow
            Deny from all
            Allow from 192.168.2.0/24
        </IfVersion>
    </LocationMatch>

#### XML notifications through SOAP

If you use old XML format, new notifications can be inserted or deleted by using SOAP request, once SOAP is activated:

##### * Insertion example in Perl

    #!/usr/bin/perl

    use SOAP::Lite;
    use utf8;

    my $lite = SOAP::Lite
            ->uri('urn:Lemonldap::NG::Common::PSGI::SOAPService')
            ->proxy('http://auth.example.com/notifications');

    $r = $lite->newNotification(
    '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <root>
    <notification uid="foo.bar" date="2009-01-27" reference="ABC">
    <text> You have been granted to access to appli-1 </text>
    <text> You have been granted to access to appli-2 </text>
    <check> I know that I can access to appli-1 </check>
    <check> I know that I can access to appli-2 </check>
    </notification>
    </root>
    ');

    if ( $r->fault ) {
        print STDERR "SOAP Error: " . $r->fault->{faultstring};
    }
    else {
        my $res = $r->result();
        print "$res notification(s) have been inserted\n";
    }

##### * Deletion example in Perl

    #!/usr/bin/perl

    use SOAP::Lite;
    use utf8;

    my $lite = SOAP::Lite
            ->uri('urn:Lemonldap::NG::Common::CGI::SOAPService')
            ->proxy('http://auth.example.com/index.pl/notification');

    $r = $lite->deleteNotification('foo.bar', 'ABC');

    if ( $r->fault ) {
        print STDERR "SOAP Error: " . $r->fault->{faultstring};
    }
    else {
        my $res = $r->result();
        print "$res notification(s) have been deleted\n";
    }

#### JSON notifications through REST

##### * Insertion example with REST API

Using JSON, you just have to POST json files.

For example with curl:

    curl -X POST -H "Content-Type: application/json" -H "Accept: application/json" -d @notif.json http://auth.example.com/notifications

##### * Deletion example with REST API

DELETE API is available with LLNG ≥ 2.0.6

For example with curl:

    curl -X DELETE -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>/<reference>

##### * List example with REST API

GET API is available with LLNG ≥ 2.0.6

For example with curl:

    # Retrieve 'wildcard' notifications
    curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications

    # Retrieve all pending notifications
    curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/_allPending_

    # Retrieve all existing notifications
    curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/_allExisting_

    # Retrieve all <uid>'s notifications
    curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>

    # Retrieve <uid>/<reference> notification parameters
    curl -X GET -H "Content-Type: application/json" -H "Accept: application/json" http://auth.example.com/notifications/<uid>/<reference>

### Test notification

You've just to insert a notification and connect to the portal using the same UID. You will be prompted.

Try also to create a global notification (to the uid "allusers"), and connect with any user, the message will be prompted.