Watchers are defined as entities that request (i.e., subscribe to) information about a resource, using the SIP event framework, RFC 3265. There is fairly complex state associated with these subscriptions. This state includes the identity of the subscriber, the state of the subscription, and so on. The union of the state for all subscriptions to a particular resource is called the watcher information for that resource. This state is dynamic, changing as subscribers come and go. As a result, it is possible, and indeed useful, to subscribe to the watcher information for a particular resource. An important application of this is the ability for a user to find out the set of subscribers to their presentity. This would allow the user to provide an authorization decision for the subscription.
This script implements SUBSCRIBE for the watcher info event package and manipulation of the pres-rules document that holds the presence policy of the subscribing user.
(NOTE) This script is available in the [[sip_clients]] package which must be installed separately from SIP SIMPLE client SDK package.
{F185997, layout=center, float, size=full, alt="subscribe info"}
```
adigeo@ag-imac3:~$sip-subscribe-winfo -h
Usage: sip-subscribe-winfo [options] [target-user@target-domain.com]
This script displays the current presence rules, SUBSCRIBEs to the
presence.winfo event of itself and prompts the user to update the presence
rules document when a new watcher is in 'pending'/'waiting' state. The program
will un-SUBSCRIBE and quit when CTRL+D is pressed.
Options:
-h, --help show this help message and exit
-a ACCOUNT_NAME, --account-name=ACCOUNT_NAME
The name of the account to use.
-s, --trace-sip Dump the raw contents of incoming and outgoing SIP
messages (disabled by default).
-j, --trace-pjsip Print PJSIP logging output (disabled by default).
````
= Example =
```
adigeo@ag-imac3:~/work/pypjua$sip-subscribe-winfo
Accounts available: 'alice', 'bob', 'ew', 'mrg', 'pbx', 'tf', 'umts', 'unet', default
Using default account: 31208005169@ag-projects.com
Resolved DNS SRV record "_sip._udp.ag-projects.com" --> proxy.sipthor.net:5060
Resolved DNS A record "proxy.sipthor.net" --> 85.17.186.7, 81.23.228.150, 81.23.228.129
Retrieving current presence rules from https://xcap.sipthor.net/xcap-root/
Allowed list:
sip:2233350608@sip2sip.info
sip:31208005163@ag-projects.com
sip:31208005166@ag-projects.com
sip:31208005167@ag-projects.com
sip:adi@umts.ro
sip:alice@example.com
sip:ruud@umts.ro
sip:317105169@eurovoice.ro
Blocked list:
Polite-blocked list:
Subscribing to "31208005169@ag-projects.com" for the presence.winfo event, at 81.23.228.129:5060
Received NOTIFY:
----
Active watchers:
Terminated watchers:
Pending watchers:
sip:bob@example.com
Waiting watchers:
----
pending watcher sip:bob@example.com wants to subscribe to your presence information. Press (a) to allow, (d) to deny, (p) to polite block:
Watcher sip:bob@example.com is now allowed
```