implement getaddressinfo (#53)

* implement getaddressinfo

* fix iswatchonly

---------

Co-authored-by: Stepan Snigirev <stepan@planqc.eu>

README.md

@@ -2,7 +2,6 @@
 
 This is a electrum-adapter. It exposes a Bitcoin-Core style API while using an electron API in the backend. It might be useful in specific usecases, e.g. having better performance when connecting to a electrum-server via Tor. In order to do that, it needs a Database. Quite easily you can use a kind of builtin SQLite. Depending on your usecase, you might want to use an external DB.
 
-Note! Requires embit from master branch. (Still true?!)
 ## Modes of usage
 
 This can be used either in standalone mode or as a specter-extension. The second option is probably the main use-case.
@@ -56,4 +55,4 @@ Before your create a PR, make sure to [blackify](https://github.com/psf/black) a
 there is a git [pre-commit hook](https://ljvmiranda921.github.io/notebook/2018/06/21/precommits-using-black-and-flake8/) which you can simply install like this:
 ```
 pre-commit install
-```
+```

src/cryptoadvance/spectrum/spectrum.py

@@ -361,7 +361,6 @@ def sync_script(self, script, state=None):
  ) # not existing, how can we fix that?
  # new tx
  else:
-
  tx_details = {
  "tx_hash": tx_magic,
  "blockhash": blockheader.get("blockhash"),
@@ -844,6 +843,46 @@ def getrawchangeaddress(self, wallet, address_type=None):
  # TODO: refill keypool, subscribe
  return desc.getscriptpubkey().address(self.network)
 
+ @walletrpc
+ def getaddressinfo(self, wallet, address: str):
+ ismine = False
+ ischange = False
+ iswatchonly = False
+ scriptpubkey = EmbitScript.from_address(address)
+ sc = Script.query.filter_by(
+ script=scriptpubkey.data.hex(), wallet=wallet
+ ).first()
+ if sc:
+ ismine = sc.index is not None
+ if ismine:
+ ischange = sc.descriptor.internal
+ iswatchonly = sc.descriptor.private_descriptor is None
+ obj = {
+ "address": address,
+ "scriptPubKey": scriptpubkey.data.hex(),
+ "ismine": ismine,
+ "ischange": ischange,
+ "solvable": ismine,
+ "iswatchonly": iswatchonly,
+ }
+ if ismine:
+ desc = sc.descriptor.get_descriptor()
+ derived_desc = desc.derive(sc.index).to_public()
+ # convert xpubs to pubs
+ for k in derived_desc.keys:
+ if k.is_extended:
+ k.key = k.key.key
+ obj.update(
+ {
+ "desc": add_checksum(str(derived_desc)),
+ "parent_desc": add_checksum(str(desc.to_public())),
+ }
+ )
+ obj["labels"] = []
+ if sc and sc.label:
+ obj["labels"] = [sc.label]
+ return obj
+
  @walletrpc
  def listlabels(self, wallet, purpose=None):
  return list(