add ExpandedSignerList amendment support

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [[Unreleased]]
 ### Added:
+- Support for ExpandedSignerList amendment that expands the maximum signer list to 32 entries
 - Function to parse the final account balances from a transaction's metadata
 - Function to parse order book changes from a transaction's metadata
 - Support for Ed25519 seeds that don't use the `sEd` prefix

tests/unit/models/transactions/test_signer_list_set.py

@@ -177,3 +177,136 @@ def test_signer_entries_signer_quorum_valid(self):
             signer_entries=_SIGNER_ENTRIES_VALID,
         )
         self.assertTrue(tx.is_valid())
+
+    def test_max_signer_entries_above_8_below_32(self):
+        signers = [
+            "rBFBipte4nAQCTsRxd2czwvSurhCpAf4X6",
+            "r3ijUH32iiy9tYNj3rD7hKWYjy1BFUxngm",
+            "rpwq8vi4Mn3L5kDJmb8Mg59CanPFPzMCnj",
+            "rB72Gzqfejai46nkA4HaKYBHwAnn2yUoT4",
+            "rGqsJSAW71pCfUwDD5m52bLw69RzFg6kMW",
+            "rs8smPRA31Ym4mGxb1wzgwxtU5eVK82Gyk",
+            "rLrugpGxzezUQLDh7Jv1tZpouuV4MQLbU9",
+            "rUQ6zLXQdh1jJLGwMXp9P8rgi42kwuafzs",
+            "rMjY8sPdfxsyRrnVKQcutxr4mTHNXy9dEF",
+        ]
+        signer_entries = []
+        for acc in signers:
+            signer_entries.append(
+                SignerEntry(
+                    account=acc,
+                    signer_weight=1,
+                )
+            )
+
+        tx = SignerListSet(
+            account=_ACCOUNT,
+            fee=_FEE,
+            sequence=_SEQUENCE,
+            signer_quorum=9,
+            signer_entries=signer_entries,
+        )
+        self.assertTrue(tx.is_valid())
+
+    def test_max_signer_entries_exceeded(self):
+        signers = [
+            "rBFBipte4nAQCTsRxd2czwvSurhCpAf4X6",
+            "r3ijUH32iiy9tYNj3rD7hKWYjy1BFUxngm",
+            "rpwq8vi4Mn3L5kDJmb8Mg59CanPFPzMCnj",
+            "rB72Gzqfejai46nkA4HaKYBHwAnn2yUoT4",
+            "rGqsJSAW71pCfUwDD5m52bLw69RzFg6kMW",
+            "rs8smPRA31Ym4mGxb1wzgwxtU5eVK82Gyk",
+            "rLrugpGxzezUQLDh7Jv1tZpouuV4MQLbU9",
+            "rUQ6zLXQdh1jJLGwMXp9P8rgi42kwuafzs",
+            "rMjY8sPdfxsyRrnVKQcutxr4mTHNXy9dEF",
+            "rUaxYLeFGm6SmMoa2WCqLKSyHwJyvaQmeG",
+            "r9wUfeVtqMfqrcDTfCpNYbNZvs5q9M9Rpo",
+            "rQncVNak5kvJGPUFa6fuKH7t8Usjs7Np1c",
+            "rnwbSSnPbVbUzuBa4etkeYrfy5v7SyhtPu",
+            "rDXh5D3t48MdBJyXByXq47k5P8Kuf1758B",
+            "rh1D4jd2mAiqUPHfAZ2cY9Nbfa3kAkaQXP",
+            "r9T129tXgtnyfGoLeS35c2HctaZAZSQoCH",
+            "rUd2uKsyCWfJP7Ve36mKoJbNCA7RYThnYk",
+            "r326x8PaAFtnaH7uoxaKrcDWuwpeHn4wDa",
+            "rpN3mkXkYhfNadcXPrY4LniM1KpM3egyQM",
+            "rsPKbR155hz1zrA4pSJp5Y2fxasZAatcHb",
+            "rsyWFLaEKTpaoSJusjpcDvGexuHCwMnqss",
+            "rUbc5RXfyF81oLDMgd3d7jpY9YMNMZG4XN",
+            "rGpYHM88BZe1iVKFHm5xiWYYxR74oxJEXf",
+            "rPsetWAtR1KxDtxzgHjRMD7Rc87rvXk5nD",
+            "rwSeNhL6Hi34igr12mCr61jY42psfTkWTq",
+            "r46Mygy98qjkDhVB6qs4sBnqaf7FPiA2vU",
+            "r4s8GmeYN4CiwVate1nMUvwMQbundqf5cW",
+            "rKAr4dQWDYG8cG2hSwJUVp4ry4WNaWiNgp",
+            "rPWXRLp1vqeUHEH3WiSKuyo9GM9XhaENQU",
+            "rPgmdBdRKGmndxNEYxUrrsYCZaS6go9RvW",
+            "rPDJZ9irzgwKRKScfEmuJMvUgrqZAJNCbL",
+            "rDuU2uSXMfEaoxN1qW8sj7aUNFLGEn3Hr2",
+            "rsbjSjA4TCB9gtm7x7SrWbZHB6g4tt9CGU",
+        ]
+        signer_entries = []
+        for acc in signers:
+            signer_entries.append(
+                SignerEntry(
+                    account=acc,
+                    signer_weight=1,
+                )
+            )
+
+        with self.assertRaises(XRPLModelException):
+            SignerListSet(
+                account=_ACCOUNT,
+                fee=_FEE,
+                sequence=_SEQUENCE,
+                signer_quorum=33,
+                signer_entries=signer_entries,
+            )
+
+    def test_signer_entries_with_wallet_locator(self):
+        signer_entries = [
+            SignerEntry(
+                account="rBFBipte4nAQCTsRxd2czwvSurhCpAf4X6",
+                signer_weight=1,
+                wallet_locator="CAFECAFECAFECAFECAFECAFECAFECAFECAFECAFECAFECAFECAFECAF"
+                "ECAFECAFE",
+            ),
+            SignerEntry(
+                account="r3ijUH32iiy9tYNj3rD7hKWYjy1BFUxngm",
+                signer_weight=1,
+            ),
+            SignerEntry(
+                account="rpwq8vi4Mn3L5kDJmb8Mg59CanPFPzMCnj",
+                signer_weight=1,
+                wallet_locator="0000000000000000000000000000000000000000000000000000000"
+                "0DEADBEEF",
+            ),
+        ]
+        tx = SignerListSet(
+            account=_ACCOUNT,
+            fee=_FEE,
+            sequence=_SEQUENCE,
+            signer_quorum=3,
+            signer_entries=signer_entries,
+        )
+        self.assertTrue(tx.is_valid())
+
+    def test_signer_entries_with_invalid_wallet_locator(self):
+        signer_entries = [
+            SignerEntry(
+                account="rBFBipte4nAQCTsRxd2czwvSurhCpAf4X6",
+                signer_weight=1,
+                wallet_locator="not_valid",
+            ),
+            SignerEntry(
+                account="r3ijUH32iiy9tYNj3rD7hKWYjy1BFUxngm",
+                signer_weight=1,
+            ),
+        ]
+        with self.assertRaises(XRPLModelException):
+            SignerListSet(
+                account=_ACCOUNT,
+                fee=_FEE,
+                sequence=_SEQUENCE,
+                signer_quorum=2,
+                signer_entries=signer_entries,
+            )

xrpl/models/transactions/signer_list_set.py

@@ -1,15 +1,32 @@
 """Model for SignerListSet transaction type."""
 from __future__ import annotations
 
+import re
 from dataclasses import dataclass, field
-from typing import Dict, List, Optional
+from typing import Dict, List, Optional, Pattern
+
+from typing_extensions import Final
 
 from xrpl.models.nested_model import NestedModel
 from xrpl.models.required import REQUIRED
 from xrpl.models.transactions.transaction import Transaction
 from xrpl.models.transactions.types import TransactionType
 from xrpl.models.utils import require_kwargs_on_init
 
+MAX_SIGNER_ENTRIES: Final[int] = 32
+"""
+Maximum number of signer entries allowed.
+
+:meta private:
+"""
+
+HEX_WALLET_LOCATOR_REGEX: Final[Pattern[str]] = re.compile("[A-Fa-f0-9]{64}")
+"""
+Matches hex-encoded WalletLocator in the format allowed by XRPL.
+
+:meta private:
+"""
+
 
 @require_kwargs_on_init
 @dataclass(frozen=True)
@@ -30,6 +47,13 @@ class SignerEntry(NestedModel):
     :meta hide-value:
     """
 
+    wallet_locator: Optional[str] = None
+    """
+    An arbitrary 256-bit (32-byte) field that can be used to identify the signer, which
+    may be useful for smart contracts, or for identifying who controls a key in a large
+    organization.
+    """
+
 
 @require_kwargs_on_init
 @dataclass(frozen=True)
@@ -78,11 +102,14 @@ def _get_errors(self: SignerListSet) -> Dict[str, str]:
                 "signer_quorum"
             ] = "`signer_quorum` must be greater than or equal to 0."
 
-        if len(self.signer_entries) < 1 or len(self.signer_entries) > 8:
+        if (
+            len(self.signer_entries) < 1
+            or len(self.signer_entries) > MAX_SIGNER_ENTRIES
+        ):
             errors["signer_entries"] = (
-                "`signer_entries` must have at least 1 member and no more than 8 "
+                "`signer_entries` must have at least 1 member and no more than {} "
                 "members. If this transaction is deleting the SignerList, then "
-                "this parameter must be omitted."
+                "this parameter must be omitted.".format(MAX_SIGNER_ENTRIES)
             )
             return errors
 
@@ -95,6 +122,13 @@ def _get_errors(self: SignerListSet) -> Dict[str, str]:
                     "The account submitting the transaction cannot appear in a "
                     "signer entry."
                 )
+            if signer_entry.wallet_locator is not None and not bool(
+                HEX_WALLET_LOCATOR_REGEX.fullmatch(signer_entry.wallet_locator)
+            ):
+                errors["signer_entries"] = (
+                    "A SignerEntry's wallet_locator must be a 256-bit (32-byte)"
+                    "hexadecimal value."
+                )
             account_set.add(signer_entry.account)
             signer_weight_sum += signer_entry.signer_weight