fix COSMOS

src/aleph/sdk/account.py

@@ -6,6 +6,7 @@
 from aleph_message.models import Chain
 
 from aleph.sdk.chains.common import get_fallback_private_key
+from aleph.sdk.chains.cosmos import CSDKAccount
 from aleph.sdk.chains.ethereum import ETHAccount
 from aleph.sdk.chains.evm import EVMAccount
 from aleph.sdk.chains.remote import RemoteAccount
@@ -38,6 +39,7 @@
     Chain.SOL: SOLAccount,
     Chain.WORLDCHAIN: EVMAccount,
     Chain.ZORA: EVMAccount,
+    Chain.CSDK: CSDKAccount,
 }
 
 

src/aleph/sdk/chains/cosmos.py

@@ -1,10 +1,12 @@
 import base64
 import hashlib
 import json
-from typing import Union
+from pathlib import Path
+from typing import Optional, Union
 
 import ecdsa
 from cosmospy._wallet import privkey_to_address, privkey_to_pubkey
+from ecdsa import BadSignatureError
 
 from .common import BaseAccount, get_fallback_private_key, get_verification_buffer
 
@@ -52,7 +54,7 @@ def __init__(self, private_key=None, hrp=DEFAULT_HRP):
     async def sign_message(self, message):
         message = self._setup_sender(message)
         verif = get_verification_string(message)
-        base64_pubkey = base64.b64encode(self.get_public_key().encode()).decode("utf-8")
+        base64_pubkey = base64.b64encode(self.get_public_key()).decode("utf-8")
         signature = await self.sign_raw(verif.encode("utf-8"))
 
         sig = {
@@ -78,17 +80,41 @@ def get_address(self) -> str:
         return privkey_to_address(self.private_key)
 
     def get_public_key(self) -> str:
-        return privkey_to_pubkey(self.private_key).decode()
+        return privkey_to_pubkey(self.private_key)
 
 
-def get_fallback_account(hrp=DEFAULT_HRP):
-    return CSDKAccount(private_key=get_fallback_private_key(), hrp=hrp)
+def get_fallback_account(path: Optional[Path] = None, hrp=DEFAULT_HRP):
+    return CSDKAccount(private_key=get_fallback_private_key(path=path), hrp=hrp)
 
 
 def verify_signature(
     signature: Union[bytes, str],
     public_key: Union[bytes, str],
     message: Union[bytes, str],
-) -> bool:
-    """TODO: Implement this"""
-    raise NotImplementedError("Not implemented yet")
+):
+    """
+    Verifies a signature.
+    Args:
+        signature: The signature to verify. Can be a base64 encoded string or bytes.
+        public_key: The public key to use for verification. Can be a base64 encoded string or bytes.
+        message: The message to verify. Can be an utf-8 string or bytes.
+    Raises:
+        BadSignatureError: If the signature is invalid.!
+    """
+
+    if isinstance(signature, str):
+        signature = base64.b64decode(signature.encode("utf-8"))
+    if isinstance(public_key, str):
+        public_key = base64.b64decode(public_key)
+    if isinstance(message, str):
+        message = message.encode("utf-8")
+
+    vk = ecdsa.VerifyingKey.from_string(public_key, curve=ecdsa.SECP256k1)
+
+    try:
+        vk.verify(
+            signature, message, hashfunc=hashlib.sha256,
+        )
+        return True
+    except Exception as e:
+        raise BadSignatureError from e

tests/unit/conftest.py

@@ -11,6 +11,7 @@
 from aiohttp import ClientResponseError
 from aleph_message.models import AggregateMessage, AlephMessage, PostMessage
 
+import aleph.sdk.chains.cosmos as cosmos
 import aleph.sdk.chains.ethereum as ethereum
 import aleph.sdk.chains.solana as solana
 import aleph.sdk.chains.substrate as substrate
@@ -54,6 +55,13 @@ def substrate_account() -> substrate.DOTAccount:
         yield substrate.get_fallback_account(path=Path(private_key_file.name))
 
 
+@pytest.fixture
+def cosmos_account() -> cosmos.CSDKAccount:
+    with NamedTemporaryFile(delete=False) as private_key_file:
+        private_key_file.close()
+        yield cosmos.get_fallback_account(path=Path(private_key_file.name))
+
+
 @pytest.fixture
 def json_messages():
     messages_path = Path(__file__).parent / "messages.json"

tests/unit/test_chain_cosmos.py

@@ -0,0 +1,91 @@
+import base64
+import json
+from dataclasses import asdict, dataclass
+
+import pytest
+from ecdsa import BadSignatureError
+
+from aleph.sdk.chains.common import get_verification_buffer
+from aleph.sdk.chains.cosmos import get_verification_string, verify_signature
+
+
+@dataclass
+class Message:
+    chain: str
+    sender: str
+    type: str
+    item_hash: str
+
+
+@pytest.mark.asyncio
+async def test_verify_signature(cosmos_account):
+    message = asdict(
+        Message(
+            "CSDK",
+            cosmos_account.get_address(),
+            "POST",
+            "SomeHash",
+        )
+    )
+    await cosmos_account.sign_message(message)
+    assert message["signature"]
+    signature = json.loads(message["signature"])
+    raw_signature = signature["signature"]
+    assert isinstance(raw_signature, str)
+
+    pub_key = base64.b64decode(signature["pub_key"]["value"])
+
+    verify_signature(
+        raw_signature,
+        pub_key,
+        get_verification_string(message),
+    )
+
+
+@pytest.mark.asyncio
+async def test_verify_signature_raw(cosmos_account):
+    message = asdict(
+        Message(
+            "CSDK",
+            cosmos_account.get_address(),
+            "POST",
+            "SomeHash",
+        )
+    )
+    await cosmos_account.sign_message(message)
+    raw_message = get_verification_buffer(message)
+    raw_signature = await cosmos_account.sign_raw(raw_message)
+    assert isinstance(raw_signature, bytes)
+
+    pub_key = cosmos_account.get_public_key()
+    verify_signature(
+        raw_signature.decode(),
+        pub_key,
+        raw_message,
+    )
+
+
+@pytest.mark.asyncio
+async def test_bad_signature(cosmos_account):
+    message = asdict(
+        Message(
+            "CSDK",
+            cosmos_account.get_address(),
+            "POST",
+            "SomeHash",
+        )
+    )
+    await cosmos_account.sign_message(message)
+    assert message["signature"]
+    signature = json.loads(message["signature"])
+    raw_signature = "1" + signature["signature"]
+    assert isinstance(raw_signature, str)
+
+    pub_key = base64.b64decode(signature["pub_key"]["value"])
+
+    with pytest.raises(BadSignatureError):
+        verify_signature(
+            raw_signature,
+            pub_key,
+            get_verification_string(message),
+        )