[Kde-pim] MailTransport resource capability

[Daniel Vrátil]

On February 23, 2016 7:28:46 PM GMT+01:00, Krzysztof Nowicki <krissn at op.pl> wrote:
>Hi,
>
>I've stumbled upon another potential issue when working on the Akonadi
>EWS 
>resource. In the Microsoft Exchange world there is no SMTP. Both
>receiving and 
>sending e-mail happens through the EWS protocol. On the Akonadi side
>the 
>default method to send e-mail is SMTP. Fortunately however a resource
>can 
>declare the "MailTransport" capability, which will allow it to be used
>to send 
>e-mail.

Remember that you need to reimplement TransportResourceBase for it to work. 

>
>This is where things get complicated, as the "MailTransport" capability
>was 
>designed to indicate a MTA-only resource. This means that declaring
>that 
>capability on a resource will disable some email reception capabilities
>(no 
>"Check mail" possibility for example)

<snip>

>So I was thinking if there would be a way to allow all-in-one resources
>in 
>Akonadi. One possibility would be to lift the current restrictions as
>to 
>receiving e-mail from resources with the "MailTransport" capability.
>This 
>would however potentially break backward compatibility with resources
>that 
>expect the current behaviour.
>
>An alternative would be to declare some additional capability 
>("MailTransportReception"?) to indicate such all-in-one resources.


I don't recall any such restriction in Akonadi server or in the TransportResourceBase, so I assume you ran into an artificial restriction in KMail UI. 

Introducing a new capability is a good idea, although I think it would be better to just have a "Synchronizable" capability, explicitly saying that this resource can sync. This way existing resources keep working (sync is implicit), MailTransport-only agents will not have sync (MT capability disables implicit sync), and you resource would have both, because you would explicitly declare the sync capability. Will of course need some adjustment in KMail to make it honor the new capability. Maybe the logic could be implemented in some method in Akonadi libs, something like Akonadi::AgentInstance::canSync(). 


Dan

>
>What do you think?
>
>K.
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Daniel Vrátil
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