"""
Copyright 2025 Biglup Labs.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
from __future__ import annotations
from typing import Optional
from .._ffi import ffi, lib
from ..errors import CardanoError
from ..cbor.cbor_reader import CborReader
from ..cbor.cbor_writer import CborWriter
from ..common.credential import Credential
from ..common.anchor import Anchor
[docs]
class UpdateDRepCert:
"""
Represents a DRep update certificate.
This certificate is used when a Delegated Representative (DRep) wants to
update their metadata anchor.
"""
[docs]
def __init__(self, ptr) -> None:
if ptr == ffi.NULL:
raise CardanoError("UpdateDRepCert: invalid handle")
self._ptr = ptr
def __del__(self) -> None:
if getattr(self, "_ptr", ffi.NULL) not in (None, ffi.NULL):
ptr_ptr = ffi.new("cardano_update_drep_cert_t**", self._ptr)
lib.cardano_update_drep_cert_unref(ptr_ptr)
self._ptr = ffi.NULL
[docs]
def __enter__(self) -> UpdateDRepCert:
return self
[docs]
def __exit__(self, exc_type, exc_val, exc_tb) -> None:
pass
[docs]
def __repr__(self) -> str:
return "UpdateDRepCert(...)"
[docs]
@classmethod
def new(
cls, credential: Credential, anchor: Optional[Anchor] = None
) -> UpdateDRepCert:
"""
Creates a new DRep update certificate.
Args:
credential: The DRep credential to update.
anchor: Optional new anchor with DRep metadata.
Returns:
A new UpdateDRepCert instance.
Raises:
CardanoError: If creation fails.
"""
out = ffi.new("cardano_update_drep_cert_t**")
anchor_ptr = anchor._ptr if anchor is not None else ffi.NULL
err = lib.cardano_update_drep_cert_new(credential._ptr, anchor_ptr, out)
if err != 0:
raise CardanoError(f"Failed to create UpdateDRepCert (error code: {err})")
return cls(out[0])
[docs]
@classmethod
def from_cbor(cls, reader: CborReader) -> UpdateDRepCert:
"""
Deserializes an UpdateDRepCert from CBOR data.
Args:
reader: A CborReader positioned at the certificate data.
Returns:
A new UpdateDRepCert deserialized from the CBOR data.
Raises:
CardanoError: If deserialization fails.
"""
out = ffi.new("cardano_update_drep_cert_t**")
err = lib.cardano_update_drep_cert_from_cbor(reader._ptr, out)
if err != 0:
raise CardanoError(
f"Failed to deserialize UpdateDRepCert from CBOR (error code: {err})"
)
return cls(out[0])
[docs]
def to_cbor(self, writer: CborWriter) -> None:
"""
Serializes the certificate to CBOR format.
Args:
writer: A CborWriter to write the serialized data to.
Raises:
CardanoError: If serialization fails.
"""
err = lib.cardano_update_drep_cert_to_cbor(self._ptr, writer._ptr)
if err != 0:
raise CardanoError(
f"Failed to serialize UpdateDRepCert to CBOR (error code: {err})"
)
@property
def credential(self) -> Credential:
"""
The DRep credential being updated.
Returns:
The Credential for the DRep.
"""
ptr = lib.cardano_update_drep_cert_get_credential(self._ptr)
if ptr == ffi.NULL:
raise CardanoError("Failed to get credential")
lib.cardano_credential_ref(ptr)
return Credential(ptr)
@credential.setter
def credential(self, value: Credential) -> None:
"""
Sets the DRep credential.
Args:
value: The Credential to set.
Raises:
CardanoError: If setting fails.
"""
err = lib.cardano_update_drep_cert_set_credential(self._ptr, value._ptr)
if err != 0:
raise CardanoError(f"Failed to set credential (error code: {err})")
@property
def anchor(self) -> Optional[Anchor]:
"""
The optional anchor with DRep metadata.
Returns:
The Anchor if present, None otherwise.
"""
ptr = lib.cardano_update_drep_cert_get_anchor(self._ptr)
if ptr == ffi.NULL:
return None
lib.cardano_anchor_ref(ptr)
return Anchor(ptr)
@anchor.setter
def anchor(self, value: Optional[Anchor]) -> None:
"""
Sets the anchor.
Args:
value: The Anchor to set, or None to clear.
Raises:
CardanoError: If setting fails.
"""
anchor_ptr = value._ptr if value is not None else ffi.NULL
err = lib.cardano_update_drep_cert_set_anchor(self._ptr, anchor_ptr)
if err != 0:
raise CardanoError(f"Failed to set anchor (error code: {err})")
[docs]
def to_cip116_json(self, writer: "JsonWriter") -> None:
"""
Serializes this certificate to CIP-116 compliant JSON.
Args:
writer: The JsonWriter to write the JSON to.
Raises:
CardanoError: If serialization fails.
"""
from ..json import JsonWriter
if not isinstance(writer, JsonWriter):
raise TypeError("writer must be a JsonWriter instance")
err = lib.cardano_update_drep_cert_to_cip116_json(self._ptr, writer._ptr)
if err != 0:
raise CardanoError(f"Failed to serialize to CIP-116 JSON (error code: {err})")