[buteo-sync-plugins-social] Store the owner email address as a custom property of the notebook. Contributes to JB#46575

See merge request !52

Setting notebook properties based on calendar info.

[buteo-sync-plugins-social] Store the owner email address as a custom property of the notebook. Contributes to JB#46575

For consistency with other plugins, store the owner email address
as a custom property of the notebook, for Google Calendars.

Also, make use of the custom property facility to store the
server-side calendar id, rather than abusing the plugin() field.

[buteo-sync-plugins-social] Prevent crash in Google Calendars sync plugin. Contributes to JB#47783

See merge request !55

Be overly defensive to attempt to ensure that we don't attempt to
dereference any null pointers.

[buteo-sync-plugins-social] Fix Google calendar event duplication. Contributes to JB#47783

See merge request !54

This commit ensures that if the sync token or timeMin value for a
notebook is invalid, we immediately abort sync, and then clear the
sync token stored in the notebook's custom property as well as
update the syncDate to an appropriate value.

Store created/updated timestamps appropriate to ensure that filtering
events for change or deletion since the last sync anchor works.

Fix bugs in codepaths related to partial upsync artifacts, by ensuring
that the event gcalId is calculated appropriately.

[buteo-sync-plugins-social] Discard spurious local addition due to downsync. Contributes to JB#47783

Previously, we would determine that local additions caused by a
downsync during the previous sync cycle should be treated as
local modifications, and upsynced.

This commit checks whether a local modification has indeed occurred
by checking the lastModified date stamp, and if no modification has
occurred, discarding the change to prevent spurious upsync.

It also fixes a bug where the wrong "since" date time would be used
when determining the local changeset, as it may be using one from
a different notebook by mistake.  This commit updates the code so
that the appropriate previous sync date for the specific notebook
is used.

[buteo-sync-plugins-social] Discard spurious local modification due to remote organizer change. Contributes to JB#47783

If a local modification is reported as a change since the last sync,
but the data in the event is identical to the data reported by the
server for that event except for the organizer email address,
then it is probably a spurious change (since Google will add the
organizer email automatically).

This commit detects that case and doesn't attempt to upsync the
modification.

Some changes (e.g. changing the organizer of an event in a shared
calendar) are not allowed, even if the user has Owner access to the
shared calendar (since the organizer field is managed specially
by Google in the shared-calendar case, allowing only the organizer
or the creator of the event to write changes there).

If we hit such a failure, ignore it and allow sync to succeed.

[buteo-sync-plugins-social] Properly store the mapping between gcalId and local UID. Contributes to JB#47783

Previously, we always stored an empty gcalId in the mapping.
This could result in "known" partial upsync artifacts being
ignored and re-upsynced, causing server-side event duplication.

This commit fixes several issues which together could lead to errors
which result in event duplication in some cases.

- sync anchor timestamp is now stored exclusively in the notebook
  as the syncDate property, to avoid atomicity issues

- sync anchor token is now stored exclusively in the notebook
  as a custom property (instead of account setting) to avoid
  atomicity issues

- detection of server-side sync token invalidation has been
  improved, allowing the sync envelope to be tweaked appropriately

- detection of events copied between calendars via Google web UI
  has been added, to ensure we don't attempt to store multiple
  events with the same UID (which could trigger a clean-sync cycle).

It also bumps the plugin version to ensure that a clean sync will
be triggered on the first run, to clean up any duplications which
may have previously occurred.

Contributes to JB#47783

Add knowncontacts plugin

See merge request !53

This is new plugin that can sync contacts written to ini files. It
ensures that the contacts are not synced to any cloud services.

buteo-sync-plugins-social] Support for multiple users. Fixes JB#47618

See merge request !51

Removes hardcoded user home directory.

[buteo-sync-plugins-social] Create local directory for dir listing requests. Fixes JB#47855

See merge request !49

The dir listing operation saves the list into a local directory.
Ensure the local directory exists before writing into it.
(Previously this was only done for download/upload requests, but
should be done for dir listings as well.)

[buteo-sync-plugins-social] Fetch backup configuration from...

See merge request !48

Do this instead of fetching config values from dconf.

[buteo-sync-plugins-social] Use SyncToken for Google Calendar delta sync. Contributes to JB#44316

See merge request !47

Previously, we used updatedMin timestamp "since" anchor to fetch
changes since last sync.  This commit updates the plugin so that
it uses the "sync token" which Google provides, so that we can
more accurately fetch changes since the last sync, and avoid
the "updatedMin too far in the past" problem which can be hit in
certain circumstances.

We store the sync tokens as account settings, as mkcal doesn't
allow arbitrary metadata to be stored for notebooks.

[license] Fix license short name in spec. Contributes to JB#45486

See merge request !45

[buteo-sync-plugins-social] Support 'list' and 'sync' operations in Dropbox...

See merge request !46

[buteo-sync-plugins-social] Support 'list' and 'sync' operations in Dropbox and OneDrive backups. Contributes to JB#47080

- 'list' operation does a directory listing and saves this to a file
- 'sync' operation does upload/download as per existing sync
  implementation

[buteo-sync-plugins-social] Remove deprecated media_info usage. Contributes to JB#46090

See merge request !44

Dropbox has deprecated media_info in list_folder requests.
This commit removes our usage of media_info from list_folder requests,
and replaces the image width/height metadata we store with placeholder
values.  Those are eventually exposed (by libsocialcache) as
photoWidth/photoHeight to QML, but are not currently used.

Store the google calendar id to SharedWith field

See merge request !42

[buteo-sync-plugins-social] Fix EX/RDATE parsing. Contributes to JB#46011

See merge request !43

RFC5545 states that the valid formats for RDATE are:
RDATE ";" "VALUE" "=" ("DATE-TIME" / "DATE" / "PERIOD") ":" <value>
RDATE ";" "TZID" "=" [tzidprefix] paramtext ":" <value>

Whereas our parsing code incorrectly omitted "VALUE=" prefix handling.

[buteo-sync-plugins-social] Fix include path

See merge request !39

[buteo-sync-plugins-social] Store the google calendar id to SharedWith field. Contributes to JB#45600