Merge bitcoindevkit/bdk#471: moving the function wallet_name_from_descriptor from blockchain/rpc.rs to wallet/mod.rs as it can be useful not only for rpc

2fc8114180 moving the function wallet_name_from_descriptor from blockchain/rpc.rs to wallet/mod.rs as it can be useful not only for rpc (Richard Ulrich)

Pull request description:

  ### Description

  Moving the function wallet_name_from_descriptor from rpc.rs to mod.rs
  Since the local cache for compact filters should be separate per wallet, this function can be useful not only for rpc.

  ### Notes to the reviewers

  I thought about renaming it, but waited for opinions on that.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  notmandatory:
    re-ACK  2fc8114

Tree-SHA512: d5732e74f7a54f54dde39fff77f94f12c611a419bed9683025ecf7be95cde330209f676dfc9346ebcd29194325589710eafdd1d533e8073d0662cb397577119f

src/wallet/mod.rs

@@ -4006,3 +4006,32 @@ pub(crate) mod test {
         builder.finish().unwrap();
     }
 }
+
+/// Deterministically generate a unique name given the descriptors defining the wallet
+pub fn wallet_name_from_descriptor<T>(
+    descriptor: T,
+    change_descriptor: Option<T>,
+    network: Network,
+    secp: &SecpCtx,
+) -> Result<String, Error>
+where
+    T: IntoWalletDescriptor,
+{
+    //TODO check descriptors contains only public keys
+    let descriptor = descriptor
+        .into_wallet_descriptor(secp, network)?
+        .0
+        .to_string();
+    let mut wallet_name = get_checksum(&descriptor[..descriptor.find('#').unwrap()])?;
+    if let Some(change_descriptor) = change_descriptor {
+        let change_descriptor = change_descriptor
+            .into_wallet_descriptor(secp, network)?
+            .0
+            .to_string();
+        wallet_name.push_str(
+            get_checksum(&change_descriptor[..change_descriptor.find('#').unwrap()])?.as_str(),
+        );
+    }
+
+    Ok(wallet_name)
+}