Autocrypt internal data in Akonadi

[Sandro Knauß]

Hey,

I want to implement [Autocrpyt] support in KMail. I need to store the internal 
state of Autocrypt per peer. But I'm not sure what is the best way to do it.

The data I need to store is per email address [1]:
* last_seen (timestamp)
* autocrypt_timestamp (timestamp)
* public_key (public key material)
* prefer_encrypt (boolean)
* gossip_timestamp (timestamp)
* gossip_key (public key material)

All those data need to be updated, when a new email is processed.

Okay the one side I already quite familiar with to write a plugin for 
mimetreeparser to extract the data to push them datastore.

But what is the datastore? A new autorcrypt resource and implement the new 
data as AkonadiAttribute? The AkonadiAttribute is the better solution, as this 
allows that resources, that they can support to sync this data in future. Or 
use a Contact Resource and overload KContacts:Addressee to store the data in 
the X-AUTOCYPT-BLABLA and use Akonadi Search to index this resource to find the 
correct entry to update, when processing the mail. But both seem not fitting 
100%, so maybe you have better ideas, how to store the data in Akonadi. 

hefee

[Autocrpyt]  https://autocrypt.org
[1] https://autocrypt.org/level1.html#id71
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