108 lines
4.7 KiB
Python
108 lines
4.7 KiB
Python
"""Transport-free LightBurn MOPA import seam; never authorizes encoding."""
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from __future__ import annotations
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from decimal import Decimal, InvalidOperation
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import xml.etree.ElementTree as ET
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UNIT_CONTRACT = "frequency=Hz;QPulseWidth=ns"
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class ProjectImportError(ValueError):
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"""Ambiguous or malformed process metadata."""
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def _number(element: ET.Element, field: str) -> str | None:
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children = element.findall(field)
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if not children:
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return None
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if len(children) != 1 or set(children[0].attrib) != {"Value"}:
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raise ProjectImportError(f"ambiguous {field}")
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raw = children[0].get("Value", "")
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try:
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value = Decimal(raw)
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except InvalidOperation as exc:
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raise ProjectImportError(f"invalid {field}") from exc
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if not value.is_finite() or value <= 0 or value > Decimal("1e12"):
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raise ProjectImportError(f"invalid {field}")
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return raw
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def _layer_id(element: ET.Element) -> str | None:
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children = element.findall("index")
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if not children:
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return None
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if len(children) != 1 or set(children[0].attrib) != {"Value"}:
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raise ProjectImportError("ambiguous layer index")
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raw = children[0].get("Value", "")
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if not raw.isdecimal():
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raise ProjectImportError("invalid layer index")
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return str(int(raw))
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def import_project_mopa(data: bytes, *, unit_contract: str | None = None) -> dict:
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"""Preserve observed XML fields and optionally normalize declared units.
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The caller must supply an independently established serialized-unit contract.
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No unit is inferred from magnitude. Missing pulse width is never defaulted.
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Results are offline metadata, not executable Rayforge workflow settings.
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"""
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if unit_contract not in (None, UNIT_CONTRACT):
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raise ProjectImportError("unsupported serialized-unit contract")
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if len(data) > 64 * 1024 * 1024:
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raise ProjectImportError("project exceeds offline import size limit")
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# Reject declarations, including UTF-16/32 encodings, before XML parsing.
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probe = data.replace(b"\x00", b"").upper()
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if b"<!DOCTYPE" in probe or b"<!ENTITY" in probe:
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raise ProjectImportError("XML declarations are unsupported")
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try:
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root = ET.fromstring(data)
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except ET.ParseError as exc:
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raise ProjectImportError("invalid project XML") from exc
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if root.tag != "LightBurnProject" or root.get("FormatVersion") != "1":
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raise ProjectImportError("unsupported project format")
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layers = []
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layer_ids: set[str] = set()
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for setting in root:
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if setting.tag not in ("CutSetting", "CutSetting_Img"):
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continue
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kind = setting.get("type")
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expected = ("Image",) if setting.tag == "CutSetting_Img" else ("Cut", "Scan")
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if kind not in expected:
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raise ProjectImportError("unsupported layer type")
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layer_id = _layer_id(setting)
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if layer_id is not None and layer_id in layer_ids:
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raise ProjectImportError("duplicate layer index")
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if layer_id is not None:
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layer_ids.add(layer_id)
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raw = {key: _number(setting, key) for key in ("frequency", "QPulseWidth")}
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blockers = []
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if unit_contract is None:
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blockers.append("serialized units unresolved")
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for key, value in raw.items():
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if value is None:
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blockers.append(f"{key} absent; explicit resolution required")
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if kind == "Image":
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blockers.append("image processing equivalence unverified")
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modes = setting.findall("ditherMode")
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if len(modes) > 1 or (modes and set(modes[0].attrib) != {"Value"}):
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raise ProjectImportError("ambiguous image mode")
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image_mode = modes[0].get("Value") if modes else None
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normalized = None
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if unit_contract and all(value is not None for value in raw.values()):
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normalized = {
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"frequency_hz": float(Decimal(raw["frequency"])),
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"frequency_khz": float(Decimal(raw["frequency"]) / 1000),
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"pulse_width_ns": float(Decimal(raw["QPulseWidth"])),
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}
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layers.append({"element": setting.tag, "type": kind,
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"source_layer_id": layer_id, "raw": raw,
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"image_mode": image_mode,
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"normalized": normalized, "blockers": blockers})
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if not layers:
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raise ProjectImportError("project has no process settings")
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return {"layers": layers, "unit_contract": unit_contract, "transport": None,
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"encoding_allowed": False, "hardware_use_allowed": False,
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"blockers": ["machine identity, correction and limits unverified",
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"offline import seam is not wired to host workflow"]}
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