Hi,
here's how to use caldavzap with the baikal server (or probably any sabredav based server).
I'd recommend to include it somewhere as configuration example (e.g. caldavzap/misc/readme_baikal_sabredav.txt).
I'll attach the following "readme_baikal_sabredav.txt" and the patch.
PROBLEM: --------
caldavzap reads and saves session settings persistently in the caldav server by PROPPATCH / PROPFIND in a principal property '{http://inf-it.com/ns/dav/%7Dsettings'.
Unfortunately, sabredav and sabredav based caldav servers... - do not provide access to new or non-standard properties - do not provide write access to principal properties with PROPPATCH
SOLUTION: ---------
An ideal and clean solution would be a sabredav plugin which allows creation and access to arbitrary new principal properties. Since such a plugin doesn't exist, I'll show here a hack which modifies baikal to just provide the specific principal property '{http://inf-it.com/ns/dav/%7Dsettings' which is needed by caldavzap.
The following steps apply to baikal 0.2.7 but should be applicable to any sabredav based server.
1. modify your sql databse: add a text type database entry to the principals table which will hold the settings. This can be done by sql commands or by using a gui frontend for your database. I've named this text field 'inf_it_settings'. Example: the sqlite structure of the principals table should then look like this: CREATE TABLE 'principals' ( id INTEGER PRIMARY KEY ASC, uri TEXT, email TEXT, displayname TEXT, vcardurl TEXT, inf_it_settings TEXT, UNIQUE(uri) )
2. apply the patch baikal-flat-0.2.7-for-caldavzap.diff to patch the baikal server. This patch does two things:
a) it modifies vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/PDO.php to map requests for the property '{http://inf-it.com/ns/dav/%7Dsettings' to the newly created database field inf_it_settings (see above 1.)
b) it modifies vendor/sabre/dav/lib/Sabre/DAVACL/Principal.php to give write access to principal properties ('write' includes 'write-properties').
best