Hi all, attached is a patch with several gpg-related improvements and simplifications.
1. Do not call gpg directly Gpgme supports listing external keys (i.e. on key servers) as well as importing keys from key servers into the local key ring and updating keys in the local ring from key servers. Thus, I replaced the operations talking directly with gpg by the respective Gpgme operations which simplifies the code and gives better feedback to the user as gpgme takes care of parsing the version-dependent gpg output. And as there is no need for telling gpgme which gpg application to use, we can completely drop the "--with-gpg-app" config option. A new module (libbalsa source file) implements helper to list keys and to run a key server operation as new thread. 2. S/MIME support It does not make sense to switch off s/mime support as its support in gpgme is completely stable since years, and we check the availability of the various engines on start-up anyway. I removed the "--enable-smime" configure option which also removes some of the nasty #ifdef's in the code. 3. Convenience widgets For a nicer (I hope...) display, I wrote widgets for displaying a key's data and a key-related message dialogue. The key widget shows the relevant data in a more structured way and highlights expired, revoked, etc. data clearly (try a message I send before December 2105; I revoked the old key). 4. Crypto workflow improvements Searching a key by mail address now requires an /exact/ match. The old code would find the key for UID "[email protected]" if the recipient is actually "[email protected]" (substring match) which was actually wrong. If no key for encryption matches the recipient's mail address, Balsa shows a list with all keys as to handle the case that a recipient failed to add the proper uid to the key. However, the list was also shown in the following case: - recipient's key exists with low trust - do not automatically accept low trust keys, so show the confirmation dialogue - user rejects the key (i.e cancel the operation) - the full key list is shown despite the cancellation Now cancel will /really/ cancel the operation. 5. Documentation and coding style Following my recent criticism, I tried to add Doxygen documentation and to follow Peter's proposed coding style. Possible improvements: (a) in the key list selection dialogue, instead of showing few key details in extra columns, we could add a hotkey/context menu to show the full key details in the new key dialogue; (b) listing all keys is slow, in particular if the local key ring is large. Thus, we might want to show something like a spinner while loading the key list; (c) in the send message dialogue, the protocol selection radio options (pgp/mime, openpgp, s/mime) are not properly disabled if the respective protocol is unavailable. I have no idea (and did not find any documentation) how only /one/ radio item of a GAction can be disabled; (d) we might want to add an option to the message composer dialogue to check the key server (not only the local key ring) if keys for recipients are available, but not yet in the local key ring. When EasyGPG (see <https://wiki.gnupg.org/EasyGpg2016>) has been fully implemented, GpgME will use WKD/WKS for that; (e) modern gpg versions will /always/ use pinentry. So we might want to remove the code reading a key's passphrase using out callbacks. As always, any feedback will be highly appreciated! Cheers, Albrecht. --- Patch details: * libbalsa/libbalsa-gpgme-keys.[ch]: (new) implement key listing and key server operations * libbalsa/libbalsa-gpgme-widgets.[ch]: (new) implement key widget and dialogue * configure.ac: drop otions "--with-gpg-app" and "--enable-smime" * libbalsa/Makefile.am: remove option for building without s/mime support * libbalsa/gmime-multipart-crypt.c, libbalsa/identity.c, libbalsa/send.c, src/balsa-print-object.c, src/sendmsg-window.c: remove conditionals for s/mime support * libbalsa/libbalsa-gpgme-cb.[ch]: use new key dialogue, fix prototype indent * libbalsa/libbalsa-gpgme.[ch]: export functions for setting a gpgme error and creating a context, do not set gpg application, remove conditionals for s/mime support, fix loading a key for a name or fingerprint, use new key listing function * libbalsa/rfc3156.[ch}: remove conditionals for s/mime support, use convenience functions exported by libbalsa-gpgme.c, export new function creating a short signature status, remove functions talking to the keyserver through gpg directly, use GLib functions to check to the trust db update lock, check for public key availibility by using the new key list function * src/balsa-mime-widget-crypto.c: use new key widget, drop GPG-related conditionals
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