PGP-backed wallets

[naps62]

No description provided.

[pferreira101]

Writing this comment for visibility and traceability as I won't be able to finish the feature @naps62.

Some prints of the current state of the feature:

• Trying to unlock the gpg file in order to get the mnemonic:

• Validate the file exists:

• Inserted wrong passphrase:

• File containing invalid mnemonic:

• Second step of the creation form:

• Reloaded gpgagent to clear cache and prompt passphrase again. Changing the derivation path asks for the passphrase again, as it is needed to read the secret to derivate the addresses, instead of keeping the mnemonic in memory:

Some handover considerations:

• The second step of the form is almost an exact copy of the HDWalletForm review step. Should extract common logic and reuse it;
• At the moment, only the creation form is coded, the update wallet form hasn't been done yet;
• I'm on Mac, and the default pinentry program (/usr/local/opt/pinentry/bin/pinentry as per gpgconf) wasn't prompting on a built version of the app (iron.app, iron.dmg). In dev mode, this prompt would happen on the terminal, instead of using the system keychain dialog. Had to replace the default pinentry with this one: https://formulae.brew.sh/formula/pinentry-mac. Not sure of what the behaviour would be on linux and windows;
• Updated .github/workflows/rust.yml or else clippy would fail;
• I think the requirements at CONTRIBUTING.md need to be updated to include gpgme, I also needed to install pkg-config in order to be able to build the app. This should extend to the release workflow.
• is_unlocked and unlock methods are still not implemented;
• At the http crate, I'm not sure if get_mnemonic_addresses_from_pgp works. It seems like cargo is not checking the file.
• Clippy is tripping, or am I missing something(?):