bug: Parsing risc0 proof which is 0 padded does not parse correctly

[stefanMadzharov]

Bug Report

Garaga version:

Current behavior:

In the moment if we have for example in the proof.json the following journal value:
{ "journal": "0x00000000000000000000000000000000000000000000000000000000000f3893" }
the
return Groth16Proof._from_risc0( seal=bytes.fromhex(seal[2:]), image_id=bytes.fromhex(image_id[2:]), journal=bytes.fromhex(journal[2:]), ) is failing because the line
journal=bytes.fromhex(journal[2:]), is failing and the fallback option is to call
public_inputs = find_item_from_key_patterns(data, ["public"]) which fails.

Expected behavior:

The correct behavior would be to correctly parse the journal.

Steps to reproduce:

Just put
{ "journal": "0x00000000000000000000000000000000000000000000000000000000000f3893" } in the proof.json and it would fail.

[stefanMadzharov]

I think I can fix it.

[feltroidprime]

Right.
Important finding indeed.

I would suggest

• creating a specific Exception "KeyPatternNotFound" to

  garaga/hydra/garaga/starknet/groth16_contract_generator/parsing_utils.py

  Lines 34 to 52 in 584cad6

  	def find_item_from_key_patterns(data: dict, key_patterns: List[str]) -> Any:
  	best_match = None
  	best_score = -1
  	for key, value in data.items():
  	for pattern in key_patterns:
  	if key.lower() == pattern.lower():
  	# Exact match
  	return value
  	elif pattern.lower() in key.lower():
  	# Partial match
  	score = key.lower().count(pattern.lower())
  	if score > best_score:
  	best_match = value
  	best_score = score
  	if best_match is not None:
  	return best_match
  	else:
  	raise ValueError(f"No key found with patterns {key_patterns}")

  to catch specifically this exception and pass only for this one

  garaga/hydra/garaga/starknet/groth16_contract_generator/parsing_utils.py

  Lines 334 to 341 in 584cad6

  	except ValueError:
  	pass
  	except KeyError:
  	pass
  	except Exception as e:
  	print(f"Error: {e}")
  	raise e

• Changing the logic

            seal = io.to_hex_str(find_item_from_key_patterns(data, ["seal"]))
            image_id = io.to_hex_str(find_item_from_key_patterns(data, ["image_id"]))
            journal = io.to_hex_str(find_item_from_key_patterns(data, ["journal"]))

io.to_hex_str is trimming the 0's on the left hence when taking bytes of even number of nibbles it's failing.