Add storage adapter nostr-mls-slqcipher-storage

[wcat7]

Description

Add a separate storage adapter nostr-mls-slqcipher-storage

Notes to the reviewers

#866 (comment)

[yukibtc]

I took a very fast look and the cood looks exactly like the nostr-mls-sqlite-storage crate but with sqlcipher support.

IMO this should be done using features in the nostr-mls-sqlite-storage crate. Something like this:

[features]
default = ["bundled"]
bundled = ["rusqlite/bundled"]
sqlcipher = ["rusqlite/sqlcipher"]
bundled-sqlcipher = ["rusqlite/bundled-sqlcipher"]
# ...

The sqlcipher and bundled-sqlcipher would enable additional methods, like:

impl NostrMlsSqliteStorage {
    #[cfg(any(feature = "sqlcipher", feature = "bundled-sqlcipher"))]
    pub fn new_encrypted<P, S>(file_path: P, password: S) -> Result<Self, Error>
    where
        P: AsRef<Path>,
        S: AsRef<&str>,
    {
        // ...
    }
}

The same for the change_password and is_encrypted (and other sqlcipher methods if I missed them).

What do you think?

@erskingardner

[erskingardner]

I'm totally ok with that. I couldn't tell how much there was different. But if it's just a dependency change and a few methods let's go with a feature.