Refactor `p_gpg_list_keys`
Add `/pgp autoimport` command,
it's not described in XEP-0027, but used in some clients,
such as PSI, Pidgin. It will autoimport keys received with
`/pgp sendpub`, in plain text as a message, or using features,
provided in other clients. It doesn't autoassign them, but shows
command to assign, letting user to decide.
Improve documentation for some preexisting functions
Add contact argument to `/pgp sendpub`
Command allows to share your PGP pub key with ease,
it's not described in XEP-0027, but used in some clients,
such as PSI, Pidgin.
Fix typos
Minor improvements
Under certain circumstances setting plain_str[len] to 0 might lead to crash
and it does not follow the best practices as well.
This change allows better handling of buffer copying and prevents crash.
Maybe we can make this configurable later.
So users have the freedom to be more strict.
This commit partly reverts 62018f48c5f1a0410445fce5bca5fdd6a9e4d907.
Example to edit trust level:
```
gpg --edit-key somekeyid
gpg (GnuPG) 2.3.4; Copyright (C) 2021 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
pub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: SC
trust: unknown validity: full
sub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: E
[ full ] (1). xmpp:user@domain.de
gpg> trust
pub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: SC
trust: unknown validity: full
sub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: E
[ full ] (1). xmpp:user@domain.de
Please decide how far you trust this user to correctly verify other users' keys
(by looking at passports, checking fingerprints from different sources, etc.)
1 = I don't know or won't say
2 = I do NOT trust
3 = I trust marginally
4 = I trust fully
5 = I trust ultimately
m = back to the main menu
Your decision? 3
pub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: SC
trust: marginal validity: full
sub rsa4096/keyid
created: 2020-06-26 expires: 2022-06-26 usage: E
[ full ] (1). xmpp:user@domain.de
Please note that the shown key validity is not necessarily correct
unless you restart the program.
gpg> quit
```
* Added logging messages (INFO if key can not be used)
* Check owner_trust < GPGME_VALIDITY_MARGINAL
The key can not be used if the owner_trust is less than MARGINAL.
As all parts of the code invoking the `files_get_account_data_path()`
function did the same afterwards, a function has been added with the same
behavior.
1. create path
2. `mkdir` of that path
3. return final path
Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
Discovering Public Keys via PEP
* 4.3 Discovering Public Keys of a User
* 4.4 Requesting Public Keys
* Import Public Keys into GnuPG's local keyring.
Issue: #1331
src/pgp/gpg.c:p_ox_gpg_readkey
Used to read a public key from a file. The function will return the fingerprint
of the file and the base64 encoded key.
src/xmpp/ox.[hc]
ox_announce_public_key(const char* const filename) can be called from the /ox
announce <filename> command. The key within the file will be pushed on PEP and
the Metadata node will be set.
Issue: #1331
