feat: Allow feast snowflake to read in byte string for private-key authentication (feast-dev#4384)

* allow feast snowflake to read in byte string for private-key authentication

Signed-off-by: Artur <artur.kolakowski@medely.com>

* Update type hint for  to use Union instead of | syntax

Signed-off-by: Artur <artur.kolakowski@medely.com>

* Update type hint for private_key to use Union instead of | syntax

Signed-off-by: Artur <artur.kolakowski@medely.com>

* Update type hint in parse_private_key_path

Signed-off-by: Artur <artur.kolakowski@medely.com>

* added private_key_content in Snowflake configs to support key-pair auth by reading in byte string

Signed-off-by: Artur <artur.kolakowski@medely.com>

* fix incompatible linting types

Signed-off-by: Artur <artur.kolakowski@medely.com>

* remove unused Union import

Signed-off-by: Artur <artur.kolakowski@medely.com>

* fix formating

Signed-off-by: Artur <artur.kolakowski@medely.com>

---------

Signed-off-by: Artur <artur.kolakowski@medely.com>
Co-authored-by: Artur <artur.kolakowski@medely.com>

Author: arturkolakowski

sdk/python/feast/infra/materialization/snowflake_engine.py

@@ -70,6 +70,9 @@ class SnowflakeMaterializationEngineConfig(FeastConfigBaseModel):
     private_key: Optional[str] = None
     """ Snowflake private key file path"""
 
+    private_key_content: Optional[bytes] = None
+    """ Snowflake private key stored as bytes"""
+
     private_key_passphrase: Optional[str] = None
     """ Snowflake private key file passphrase"""
 

sdk/python/feast/infra/offline_stores/snowflake.py

@@ -107,6 +107,9 @@ class SnowflakeOfflineStoreConfig(FeastConfigBaseModel):
     private_key: Optional[str] = None
     """ Snowflake private key file path"""
 
+    private_key_content: Optional[bytes] = None
+    """ Snowflake private key stored as bytes"""
+
     private_key_passphrase: Optional[str] = None
     """ Snowflake private key file passphrase"""
 

sdk/python/feast/infra/online_stores/snowflake.py

@@ -53,6 +53,9 @@ class SnowflakeOnlineStoreConfig(FeastConfigBaseModel):
     private_key: Optional[str] = None
     """ Snowflake private key file path"""
 
+    private_key_content: Optional[bytes] = None
+    """ Snowflake private key stored as bytes"""
+
     private_key_passphrase: Optional[str] = None
     """ Snowflake private key file passphrase"""
 

sdk/python/feast/infra/registry/snowflake.py

@@ -96,6 +96,9 @@ class SnowflakeRegistryConfig(RegistryConfig):
     private_key: Optional[str] = None
     """ Snowflake private key file path"""
 
+    private_key_content: Optional[bytes] = None
+    """ Snowflake private key stored as bytes"""
+
     private_key_passphrase: Optional[str] = None
     """ Snowflake private key file passphrase"""
 

sdk/python/feast/infra/utils/snowflake/snowflake_utils.py

@@ -84,9 +84,11 @@ def __enter__(self):
 
             # https://docs.snowflake.com/en/user-guide/python-connector-example.html#using-key-pair-authentication-key-pair-rotation
             # https://docs.snowflake.com/en/user-guide/key-pair-auth.html#configuring-key-pair-authentication
-            if "private_key" in kwargs:
+            if "private_key" in kwargs or "private_key_content" in kwargs:
                 kwargs["private_key"] = parse_private_key_path(
-                    kwargs["private_key"], kwargs["private_key_passphrase"]
+                    kwargs.get("private_key_passphrase"),
+                    kwargs.get("private_key"),
+                    kwargs.get("private_key_content"),
                 )
 
             try:
@@ -510,13 +512,27 @@ def chunk_helper(lst: pd.DataFrame, n: int) -> Iterator[Tuple[int, pd.DataFrame]
         yield int(i / n), lst[i : i + n]
 
 
-def parse_private_key_path(key_path: str, private_key_passphrase: str) -> bytes:
-    with open(key_path, "rb") as key:
+def parse_private_key_path(
+    private_key_passphrase: str,
+    key_path: Optional[str] = None,
+    private_key_content: Optional[bytes] = None,
+) -> bytes:
+    """Returns snowflake pkb by parsing and reading either from key path or private_key_content as byte string."""
+    if private_key_content:
         p_key = serialization.load_pem_private_key(
-            key.read(),
+            private_key_content,
             password=private_key_passphrase.encode(),
             backend=default_backend(),
         )
+    elif key_path:
+        with open(key_path, "rb") as key:
+            p_key = serialization.load_pem_private_key(
+                key.read(),
+                password=private_key_passphrase.encode(),
+                backend=default_backend(),
+            )
+    else:
+        raise ValueError("Please provide key_path or private_key_content.")
 
     pkb = p_key.private_bytes(
         encoding=serialization.Encoding.DER,