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Summary:
There are many things going on here (perhaps a bit much for a single patch):
- When an attachment is of mime type "application/pgp-keys", a button is added to import the key to GPG
- When sending a mail and crypto is enabled (encryption, signing or both), the public key of the first private key found is sent as an un-encrypted attachment (T6994)
- The `mailcrypto.{h,cpp}` was, for the most part, rewritten
- Introduction of the expected monad, inspired by what was proposed for C++ [here](https://isocpp.org/files/papers/n4015.pdf), but not at all a strict implementation of this specification. We may want to add some more features of this standard later.
The rationale for some of the choices:
- I found mailcrypto a bit hard to edit to add new features, and a great part was commented code to prepare for the support the SMIME crypto format, which would (in my current knowledge) not be used for sending emails.
- One thing I found that may be missing in the code base was a standardized way of handling errors in C++ code. Since exceptions are disabled I think that the functional way is the way to go. After some research I found the Expected monad / tagged union / sum type, which seemed to suit the problem particularly well.
In the long run, I hope we would move the entire code base to use `Expected` to indicate if a function might fail.
Of course every choice made here is to be considered as a proposition for doing things / RFC, critics wholeheartedly accepted.
Reviewers: cmollekopf
Tags: #kube
Maniphest Tasks: T6994, T8147, T6995
Differential Revision: https://phabricator.kde.org/D11158
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