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import base64
import ctypes
import hashlib
import json
import math
import os
import re
import resource
import shlex
import stat
import subprocess
import sys
import tempfile
import traceback
import zipfile
import xml.etree.ElementTree as ET
from pathlib import Path
from pathlib import PurePosixPath
DESKTOP = Path("/home/user/Desktop")
ROOT = Path(os.environ.get("ENGIWORLD_TASK10_STAGE", str(DESKTOP)))
PART_PATH = ROOT / "part.step"
FIXTURE_PATH = ROOT / "fixture.step"
FCSTD_PATH = ROOT / "task-10.FCStd"
NC_PATH = ROOT / "task-10.nc"
EXPECTED_PART_SHA256 = "57e6e748d29109dce6f137ebce5e6b291868c6e2091a1155b5999116c31cf060"
EXPECTED_FIXTURE_SHA256 = "98300ac3a6160094e2c008bdc4760487d3337877fe24dfb14560fcab83907122"
EXPECTED_FREECAD_COMMIT = "b9bfa5c5507506e4515816414cd27f4851d00489"
FREECADCMD = Path("/usr/bin/freecadcmd")
BWRAP = Path("/usr/bin/bwrap")
NUMBER = r"[+-]?(?:\d+(?:\.\d*)?|\.\d+)"
WORD_RE = re.compile(rf"([A-Z])\s*({NUMBER})", re.IGNORECASE)
TOP_Z = 18.0
FLOOR_Z = 13.0
INTERMEDIATE_Z = 15.5
SAFE_Z = 26.0
CLEARANCE_Z = 27.0
TOOL_DIAMETER = 10.0
TOOL_RADIUS = TOOL_DIAMETER / 2.0
CUTTING_EDGE_HEIGHT = 20.0
FIXTURE_CLEARANCE = 3.0
CENTER_CLEARANCE = TOOL_RADIUS + FIXTURE_CLEARANCE
POCKET_BOUNDS = (-25.0, 25.0, -15.0, 15.0)
ALLOWED_OBJECT_TYPES = {
"App::DocumentObjectGroup",
"App::FeaturePython",
"App::Line",
"App::Origin",
"App::Plane",
"Part::Feature",
"Part::FeaturePython",
"PartDesign::Feature",
"PartDesign::Body",
"Path::FeaturePython",
"Sketcher::SketchObject",
}
PROXY_STATES = {
("Path.Base.SetupSheet", "SetupSheet"): b"null",
("Path.Dressup.Boundary", "DressupPathBoundary"): b"null",
("Path.Main.Job", "ObjectJob"): b"null",
("Path.Main.Stock", "StockFromBase"): b"null",
("Path.Main.Stock", "StockCreateBox"): b"null",
("Path.Op.PocketShape", "ObjectPocket"): b"null",
("Path.Tool.Bit", "ToolBit"): b"null",
("Path.Tool.Controller", "ToolController"): b"{}",
("draftobjects.clone", "Clone"): b'"Clone"',
}
STOCK_PROXY_PAIRS = {
("Path.Main.Stock", "StockFromBase"),
("Path.Main.Stock", "StockCreateBox"),
}
ALLOWED_EXTENSIONS = {
"App::GeoFeatureGroupExtension",
"App::GroupExtension",
"App::GroupExtensionPython",
"App::OriginGroupExtension",
"Part::AttachExtension",
"Part::AttachExtensionPython",
}
G_MODAL_GROUPS = (
frozenset({0, 1, 2, 3, 80}),
frozenset({17}),
frozenset({90}),
frozenset({94}),
frozenset({21}),
frozenset({40}),
frozenset({43, 49}),
frozenset({54}),
)
M_MODAL_GROUPS = (
frozenset({2, 30}),
frozenset({3, 4, 5}),
frozenset({6}),
frozenset({7, 8, 9}),
)
def close(first, second, tolerance: float = 1e-5) -> bool:
return abs(float(first) - float(second)) <= tolerance
def regular_file(path: Path, maximum_size: int) -> bool:
try:
info = path.lstat()
except OSError:
return False
return stat.S_ISREG(info.st_mode) and not path.is_symlink() and 0 < info.st_size <= maximum_size
def sha256(path: Path) -> str:
digest = hashlib.sha256()
with path.open("rb") as stream:
for chunk in iter(lambda: stream.read(1024 * 1024), b""):
digest.update(chunk)
return digest.hexdigest()
def normalized_text_sha256(path: Path) -> str:
data = path.read_bytes().replace(b"\r\n", b"\n").replace(b"\r", b"\n")
return hashlib.sha256(data).hexdigest()
def stage_file(source: Path, destination: Path, maximum_size: int) -> bool:
flags = (
os.O_RDONLY
| getattr(os, "O_CLOEXEC", 0)
| getattr(os, "O_NOFOLLOW", 0)
| getattr(os, "O_NONBLOCK", 0)
)
try:
descriptor = os.open(source, flags)
try:
info = os.fstat(descriptor)
if not stat.S_ISREG(info.st_mode) or not 0 < info.st_size <= maximum_size:
return False
remaining = info.st_size
chunks = []
while remaining:
chunk = os.read(descriptor, min(1024 * 1024, remaining))
if not chunk:
return False
chunks.append(chunk)
remaining -= len(chunk)
if os.read(descriptor, 1):
return False
finally:
os.close(descriptor)
destination.write_bytes(b"".join(chunks))
destination.chmod(0o444)
return True
except OSError:
return False
def safe_fcstd_container(path: Path) -> bool:
if not regular_file(path, 20 * 1024 * 1024) or not zipfile.is_zipfile(path):
return False
try:
with zipfile.ZipFile(path) as archive:
entries = archive.infolist()
names = [entry.filename for entry in entries]
if (
not 1 <= len(entries) <= 120
or len(names) != len(set(names))
or names.count("Document.xml") != 1
or sum(entry.file_size for entry in entries) > 50 * 1024 * 1024
):
return False
for entry in entries:
member = PurePosixPath(entry.filename)
mode = (entry.external_attr >> 16) & 0o170000
ratio = entry.file_size / max(entry.compress_size, 1)
if (
entry.is_dir()
or entry.flag_bits & 0x1
or entry.compress_type not in {zipfile.ZIP_STORED, zipfile.ZIP_DEFLATED}
or entry.file_size > 20 * 1024 * 1024
or ratio > 200
or entry.filename.startswith("/")
or "\\" in entry.filename
or ".." in member.parts
or mode == stat.S_IFLNK
or member.suffix.lower() in {".py", ".pyc", ".pyd", ".so", ".dll", ".exe", ".sh"}
or not (
entry.filename == "Document.xml"
or entry.filename == "GuiDocument.xml"
or entry.filename == "Locations"
or entry.filename == "thumbnails/Thumbnail.png"
or member.suffix.lower() in {".brp", ".nc"}
)
):
return False
xml_data = archive.read("Document.xml")
gui_xml_data = archive.read("GuiDocument.xml") if "GuiDocument.xml" in names else None
except (OSError, KeyError, RuntimeError, zipfile.BadZipFile):
return False
xml_payloads = [xml_data] + ([gui_xml_data] if gui_xml_data is not None else [])
if any(
len(payload) > 5 * 1024 * 1024
or b"<!DOCTYPE" in payload.replace(b"\x00", b"").upper()
or b"<!ENTITY" in payload.replace(b"\x00", b"").upper()
for payload in xml_payloads
):
return False
try:
root = ET.fromstring(xml_data)
if gui_xml_data is not None:
ET.fromstring(gui_xml_data)
except ET.ParseError:
return False
objects = root.find("Objects")
object_data = root.find("ObjectData")
if objects is None or object_data is None:
return False
declarations = objects.findall("Object")
data_objects = object_data.findall("Object")
declared_names = [obj.get("name", "") for obj in declarations]
data_names = [obj.get("name", "") for obj in data_objects]
if (
not 1 <= len(declarations) <= 60
or len(declared_names) != len(set(declared_names))
or set(declared_names) != set(data_names)
or any(obj.get("type") not in ALLOWED_OBJECT_TYPES for obj in declarations)
):
return False
if any(extension.get("type") not in ALLOWED_EXTENSIONS for extension in root.findall(".//Extension")):
return False
archive_names = set(names)
for tag, suffix in (("Part", ".brp"), ("Path", ".nc")):
for node in root.findall(f".//{tag}"):
reference = node.get("file", "")
member = PurePosixPath(reference)
if (
not reference
or reference.startswith("/")
or "\\" in reference
or ".." in member.parts
or len(member.parts) != 1
or member.suffix.lower() != suffix
or reference not in archive_names
):
return False
all_python_properties = root.findall('.//*[@type="App::PropertyPythonObject"]')
audited_python_properties = []
seen_pairs = []
for obj in data_objects:
python_properties = [
prop
for prop in obj.findall("./Properties/Property")
if prop.get("type") == "App::PropertyPythonObject"
]
audited_python_properties.extend(python_properties)
for prop in python_properties:
nodes = prop.findall("Python")
if prop.get("name") != "Proxy" or len(nodes) != 1:
return False
node = nodes[0]
if set(node.attrib) != {"value", "encoded", "module", "class"} or node.get("encoded") != "yes":
return False
pair = (node.get("module"), node.get("class"))
if pair not in PROXY_STATES:
return False
try:
decoded = base64.b64decode(node.get("value", ""), validate=True)
except (ValueError, TypeError):
return False
if decoded != PROXY_STATES[pair]:
return False
seen_pairs.append(pair)
required_pairs = set(PROXY_STATES) - STOCK_PROXY_PAIRS
stock_pairs = [pair for pair in seen_pairs if pair in STOCK_PROXY_PAIRS]
if (
len(all_python_properties) != len(audited_python_properties)
or {id(prop) for prop in all_python_properties} != {id(prop) for prop in audited_python_properties}
or any(seen_pairs.count(pair) != 1 for pair in required_pairs)
or len(stock_pairs) != 1
or len(seen_pairs) != len(required_pairs) + 1
):
return False
allowed_file_values = {
"",
"/home/user/Desktop/task-10.nc",
"/usr/lib/freecad/Mod/Path/Tools/Shape/endmill.fcstd",
}
for prop in root.findall('.//Property[@type="App::PropertyFile"]'):
strings = prop.findall("String")
if len(strings) != 1 or strings[0].get("value", "") not in allowed_file_values:
return False
return True
def proxy_module(obj) -> str:
proxy = getattr(obj, "Proxy", None)
return getattr(proxy.__class__, "__module__", "") if proxy is not None else ""
def object_state_clean(obj) -> bool:
try:
states = {str(value) for value in obj.State}
except Exception:
return False
return not states.intersection({"Touched", "Invalid", "Error"})
def shapes_equal(first, second, tolerance: float = 1e-5) -> bool:
try:
return (
first.isValid()
and second.isValid()
and first.cut(second).Volume <= tolerance
and second.cut(first).Volume <= tolerance
)
except Exception:
return False
def expected_part(Part, App):
return Part.makeBox(120.0, 80.0, TOP_Z, App.Vector(-60.0, -40.0, 0.0))
def expected_fixture(Part, App):
return Part.makeCompound(
[
Part.makeBox(15.0, 20.0, 4.0, App.Vector(-45.0, -10.0, TOP_Z)),
Part.makeBox(15.0, 20.0, 4.0, App.Vector(30.0, -10.0, TOP_Z)),
]
)
def expected_avoidance(Part, App):
envelopes = []
for solid in expected_fixture(Part, App).Solids:
box = solid.BoundBox
radius = CENTER_CLEARANCE
pieces = [
Part.makeBox(box.XLength + 2.0 * radius, box.YLength, box.ZLength,
App.Vector(box.XMin - radius, box.YMin, box.ZMin)),
Part.makeBox(box.XLength, box.YLength + 2.0 * radius, box.ZLength,
App.Vector(box.XMin, box.YMin - radius, box.ZMin)),
Part.makeBox(box.XLength, box.YLength, box.ZLength + 2.0 * radius,
App.Vector(box.XMin, box.YMin, box.ZMin - radius)),
]
for y in (box.YMin, box.YMax):
for z in (box.ZMin, box.ZMax):
pieces.append(Part.makeCylinder(radius, box.XLength, App.Vector(box.XMin, y, z), App.Vector(1, 0, 0)))
for x in (box.XMin, box.XMax):
for z in (box.ZMin, box.ZMax):
pieces.append(Part.makeCylinder(radius, box.YLength, App.Vector(x, box.YMin, z), App.Vector(0, 1, 0)))
for x in (box.XMin, box.XMax):
for y in (box.YMin, box.YMax):
pieces.append(Part.makeCylinder(radius, box.ZLength, App.Vector(x, y, box.ZMin), App.Vector(0, 0, 1)))
for x in (box.XMin, box.XMax):
for y in (box.YMin, box.YMax):
for z in (box.ZMin, box.ZMax):
pieces.append(Part.makeSphere(radius, App.Vector(x, y, z)))
envelope = pieces[0]
for piece in pieces[1:]:
envelope = envelope.fuse(piece)
envelopes.append(envelope)
return Part.makeCompound(envelopes)
def distance_to_segment(px: float, py: float, start, end) -> float:
ax, ay = start
bx, by = end
dx = bx - ax
dy = by - ay
denominator = dx * dx + dy * dy
if denominator <= 1e-16:
return math.hypot(px - ax, py - ay)
scale = max(0.0, min(1.0, ((px - ax) * dx + (py - ay) * dy) / denominator))
return math.hypot(px - (ax + scale * dx), py - (ay + scale * dy))
def rounded_rectangle_contains(x: float, y: float, bounds, radius: float) -> bool:
xmin, xmax, ymin, ymax = bounds
center_x = min(max(x, xmin + radius), xmax - radius)
center_y = min(max(y, ymin + radius), ymax - radius)
return math.hypot(x - center_x, y - center_y) <= radius + 1e-8
def disk_face(Part, App, x: float, y: float, z: float, radius: float):
edge = Part.makeCircle(radius, App.Vector(x, y, z))
return Part.Face(Part.Wire([edge]))
def capsule_face(Part, App, start, end, z: float, radius: float):
start_disk = disk_face(Part, App, start[0], start[1], z, radius)
length = math.hypot(end[0] - start[0], end[1] - start[1])
if length <= 1e-10:
return start_disk
nx = -(end[1] - start[1]) * radius / length
ny = (end[0] - start[0]) * radius / length
corners = [
App.Vector(start[0] + nx, start[1] + ny, z),
App.Vector(end[0] + nx, end[1] + ny, z),
App.Vector(end[0] - nx, end[1] - ny, z),
App.Vector(start[0] - nx, start[1] - ny, z),
]
strip = Part.Face(Part.makePolygon(corners + [corners[0]]))
end_disk = disk_face(Part, App, end[0], end[1], z, radius)
return start_disk.fuse(strip).fuse(end_disk).removeSplitter()
def cutter_at_point(Part, App, point):
return Part.makeCylinder(
TOOL_RADIUS,
CUTTING_EDGE_HEIGHT,
point,
App.Vector(0.0, 0.0, 1.0),
)
def edge_point_at_length(edge, distance: float):
length = float(edge.Length)
if distance <= 0.0:
return edge.valueAt(edge.FirstParameter)
if distance >= length:
return edge.valueAt(edge.LastParameter)
parameter = edge.getParameterByLength(distance)
return edge.valueAt(parameter)
def certified_edge_clearance(edge, fixture_shape, Part, App):
length = float(edge.Length)
if not math.isfinite(length) or length <= 1e-10:
return None
cache = {}
def sample(distance: float):
key = round(distance, 12)
if key in cache:
return cache[key]
point = edge_point_at_length(edge, distance)
if not all(math.isfinite(value) for value in (point.x, point.y, point.z)):
raise ValueError("non-finite edge point")
cutter = cutter_at_point(Part, App, point)
clearance = float(cutter.distToShape(fixture_shape)[0])
if not math.isfinite(clearance):
raise ValueError("non-finite fixture clearance")
cache[key] = (point, clearance)
return cache[key]
try:
start_point, start_clearance = sample(0.0)
end_point, end_clearance = sample(length)
except Exception:
return None
stack = [(0.0, length, start_clearance, end_clearance, 0)]
certified_minimum = float("inf")
while stack:
start_length, end_length, first_clearance, second_clearance, depth = stack.pop()
interval = end_length - start_length
lower_bound = min(first_clearance, second_clearance) - interval / 2.0
if lower_bound >= FIXTURE_CLEARANCE - 0.02:
certified_minimum = min(certified_minimum, lower_bound)
continue
if min(first_clearance, second_clearance) < FIXTURE_CLEARANCE - 0.02 or depth >= 30:
return None
middle_length = (start_length + end_length) / 2.0
try:
_, middle_clearance = sample(middle_length)
except Exception:
return None
if middle_clearance < FIXTURE_CLEARANCE - 0.02:
return None
stack.append((middle_length, end_length, middle_clearance, second_clearance, depth + 1))
stack.append((start_length, middle_length, first_clearance, middle_clearance, depth + 1))
if certified_minimum == float("inf"):
return None
return certified_minimum
def edge_chords(edge):
if edge is None:
return []
try:
points = list(edge.discretize(Deflection=0.02))
except Exception:
points = [edge.valueAt(edge.FirstParameter), edge.valueAt(edge.LastParameter)]
if len(points) < 2:
return []
return list(zip(points, points[1:]))
def contact_chord(start, end):
if min(start.z, end.z) >= TOP_Z - 1e-5:
return None
first = start
second = end
dz = end.z - start.z
if abs(dz) > 1e-12:
fraction = (TOP_Z - start.z) / dz
if 0.0 < fraction < 1.0:
crossing = start + (end - start) * fraction
if start.z > TOP_Z:
first = crossing
elif end.z > TOP_Z:
second = crossing
return first, second
def property_semantics(obj, name: str) -> str:
details = [name]
for method_name in ("getGroupOfProperty", "getDocumentationOfProperty"):
try:
details.append(str(getattr(obj, method_name)(name)))
except Exception:
pass
return " ".join(details).lower().replace("_", " ")
def property_meaning(obj, name: str) -> str:
details = [name]
try:
details.append(str(obj.getDocumentationOfProperty(name)))
except Exception:
pass
return " ".join(details).lower().replace("_", " ")
def fixture_semantics(obj, name: str) -> bool:
text = property_semantics(obj, name)
return any(token in text for token in ("fixture", "check geometry", "checkgeometry", "clamp"))
def linked_to(obj, target) -> bool:
link_types = {
"App::PropertyLink",
"App::PropertyLinkChild",
"App::PropertyLinkGlobal",
"App::PropertyLinkHidden",
"App::PropertyLinkList",
"App::PropertyLinkListChild",
"App::PropertyLinkListGlobal",
"App::PropertyLinkListHidden",
"App::PropertyLinkSub",
"App::PropertyLinkSubChild",
"App::PropertyLinkSubGlobal",
"App::PropertyLinkSubHidden",
"App::PropertyLinkSubList",
"App::PropertyLinkSubListChild",
"App::PropertyLinkSubListGlobal",
"App::PropertyLinkSubListHidden",
"App::PropertyXLink",
"App::PropertyXLinkContainer",
"App::PropertyXLinkList",
"App::PropertyXLinkSub",
"App::PropertyXLinkSubList",
}
def targets(value):
if value is None:
return []
if hasattr(value, "Name") and hasattr(value, "Document"):
return [value]
if isinstance(value, tuple) and value and hasattr(value[0], "Name"):
return [value[0]]
if isinstance(value, (list, tuple)):
result = []
for item in value:
result.extend(targets(item))
return result
return []
try:
links = [
(name, targets(getattr(obj, name)))
for name in obj.PropertiesList
if obj.getTypeIdOfProperty(name) in link_types
and fixture_semantics(obj, name)
]
return bool(links) and all(
values and all(value == target for value in values) and not obj.getEditorMode(name)
for name, values in links
)
except Exception:
return False
def semantic_scalar_values(obj, predicate):
scalar_types = {
"App::PropertyDistance",
"App::PropertyFloat",
"App::PropertyFloatConstraint",
"App::PropertyInteger",
"App::PropertyIntegerConstraint",
"App::PropertyLength",
"App::PropertyPercent",
"App::PropertyQuantity",
}
try:
values = []
for name in obj.PropertiesList:
if obj.getTypeIdOfProperty(name) not in scalar_types:
continue
semantics = property_semantics(obj, name)
meaning = property_meaning(obj, name)
normalized_name = name.lower().replace("_", "").replace(" ", "")
if not predicate(normalized_name, semantics, meaning):
continue
if obj.getEditorMode(name):
return []
value = getattr(obj, name)
number = value.Value if hasattr(value, "Value") else value
values.append(float(number))
return values
except Exception:
return []
def has_scalar_value(obj, expected: float) -> bool:
values = semantic_scalar_values(
obj,
lambda name, semantics, meaning: (
name not in {"clearanceheight", "safeheight"}
and any(token in semantics for token in ("fixture", "check geometry", "checkgeometry", "clamp"))
and any(token in meaning for token in ("clear", "offset", "distance", "gap", "safety"))
and not ("tool" in meaning and "radius" in meaning)
),
)
return bool(values) and all(close(value, expected) for value in values)
def avoidance_has_editable_offset(avoidance) -> bool:
total_markers = ("center", "envelope", "total", "combined")
total_values = semantic_scalar_values(
avoidance,
lambda name, semantics, meaning: (
any(marker in meaning for marker in total_markers)
and any(token in meaning for token in ("clear", "offset", "distance", "gap", "safety"))
and any(token in semantics for token in ("fixture", "check geometry", "checkgeometry", "clamp"))
and not ("tool" in meaning and "radius" in meaning)
),
)
fixture_values = semantic_scalar_values(
avoidance,
lambda name, semantics, meaning: (
any(token in meaning for token in ("clear", "offset", "distance", "gap", "safety"))
and any(token in semantics for token in ("fixture", "check geometry", "checkgeometry", "clamp"))
and any(token in meaning for token in ("fixture", "clamp"))
and not any(marker in meaning for marker in total_markers)
and not ("tool" in meaning and "radius" in meaning)
),
)
radius_values = semantic_scalar_values(
avoidance,
lambda name, semantics, meaning: (
"tool" in meaning
and "radius" in meaning
and any(token in semantics for token in ("fixture", "check geometry", "checkgeometry", "clamp"))
),
)
if total_values and not all(close(value, CENTER_CLEARANCE) for value in total_values):
return False
if fixture_values and not all(close(value, FIXTURE_CLEARANCE) for value in fixture_values):
return False
if radius_values and not all(close(value, TOOL_RADIUS) for value in radius_values):
return False
return bool(total_values) or (bool(fixture_values) and bool(radius_values))
def avoidance_is_linked_offset(avoidance, fixture_object, fixture_shape, Part, App) -> bool:
try:
shape = avoidance.Shape
if (
not linked_to(avoidance, fixture_object)
or not avoidance_has_editable_offset(avoidance)
or shape.isNull()
or not shape.isValid()
):
return False
if fixture_shape.cut(shape).Volume > 1e-4:
return False
expected_shape = expected_avoidance(Part, App)
if expected_shape.cut(shape).Volume > 1e-3:
return False
expected_bounds = expected_shape.BoundBox
actual_bounds = shape.BoundBox
if any(
not close(actual, expected, 1e-4)
for actual, expected in (
(actual_bounds.XMin, expected_bounds.XMin),
(actual_bounds.XMax, expected_bounds.XMax),
(actual_bounds.YMin, expected_bounds.YMin),
(actual_bounds.YMax, expected_bounds.YMax),
(actual_bounds.ZMin, expected_bounds.ZMin),
(actual_bounds.ZMax, expected_bounds.ZMax),
)
):
return False
return True
except Exception:
return False
def validate_operation_path(operation, fixture_shape, Part, App, PathGeom):
commands = list(operation.Path.Commands)
current = {axis: None for axis in ("X", "Y", "Z")}
first_motion = True
floor_segments = []
level_segments = {INTERMEDIATE_Z: [], FLOOR_Z: []}
minimum_clearance = float("inf")
for command in commands:
name = str(command.Name).upper().replace(" ", "")
if name not in {"G0", "G00", "G1", "G01", "G2", "G02", "G3", "G03"}:
continue
parameters = command.Parameters
before = dict(current)
for axis in current:
if axis in parameters:
current[axis] = float(parameters[axis])
if first_motion:
first_motion = False
if name not in {"G0", "G00"} or "Z" not in parameters or float(parameters["Z"]) < CLEARANCE_Z - 1e-4:
return None
if not all(value is not None for value in current.values()):
continue
if not all(value is not None for value in before.values()):
if current["Z"] < CLEARANCE_Z - 1e-4:
return None
continue
start = App.Vector(before["X"], before["Y"], before["Z"])
try:
edge = PathGeom.edgeForCmd(command, start)
except Exception:
return None
chords = edge_chords(edge)
if not chords:
continue
rapid = name in {"G0", "G00"}
for first, second in chords:
if min(first.z, second.z) < FLOOR_Z - 1e-4:
return None
horizontal = math.hypot(second.x - first.x, second.y - first.y) > 1e-6
if rapid and min(first.z, second.z) < SAFE_Z - 1e-4:
vertical_retract = not horizontal and second.z >= first.z - 1e-6
if not vertical_retract:
return None
if rapid:
continue
contact = contact_chord(first, second)
if contact is None:
continue
low_first, low_second = contact
if any(
point.x < POCKET_BOUNDS[0] + TOOL_RADIUS - 0.02
or point.x > POCKET_BOUNDS[1] - TOOL_RADIUS + 0.02
or point.y < POCKET_BOUNDS[2] + TOOL_RADIUS - 0.02
or point.y > POCKET_BOUNDS[3] - TOOL_RADIUS + 0.02
for point in (low_first, low_second)
):
return None
if horizontal and close(first.z, second.z, 1e-4):
for level in level_segments:
if close(first.z, level, 1e-4):
segment = ((first.x, first.y), (second.x, second.y))
level_segments[level].append(segment)
if level == FLOOR_Z:
floor_segments.append(segment)
clearance = certified_edge_clearance(edge, fixture_shape, Part, App)
if clearance is None:
return None
minimum_clearance = min(minimum_clearance, clearance)
if not floor_segments or minimum_clearance == float("inf"):
return None
for level, segments in level_segments.items():
if not segments:
return None
samples = 0
x = POCKET_BOUNDS[0]
while x <= POCKET_BOUNDS[1] + 1e-8:
y = POCKET_BOUNDS[2]
while y <= POCKET_BOUNDS[3] + 1e-8:
if rounded_rectangle_contains(x, y, POCKET_BOUNDS, TOOL_RADIUS):
if min(distance_to_segment(x, y, start, end) for start, end in segments) > TOOL_RADIUS + 0.12:
return None
samples += 1
y += 0.5
x += 0.5
if samples < 4000:
return None
return minimum_clearance
ACTIVE_COMMENT = re.compile(
r"^(?:ABORT|DEBUG|LOG|LOGAPPEND|LOGCLOSE|LOGOPEN|MSG|PRINT|PROBECLOSE|PROBEOPEN)(?:\s|,|$)"
)
def reject_active_comment(content: str) -> None:
if ACTIVE_COMMENT.match(content.strip().upper()):
raise ValueError("active LinuxCNC comment")
def strip_comments(text: str):
output = []
for raw_line in text.splitlines(keepends=True):
if raw_line.endswith("\r\n"):
line, ending = raw_line[:-2], "\r\n"
elif raw_line.endswith(("\r", "\n")):
line, ending = raw_line[:-1], raw_line[-1]
else:
line, ending = raw_line, ""
cleaned = list(line)
parenthesis_comments = []
semicolon_comment = None
index = 0
while index < len(line):
char = line[index]
if char == "(":
end = line.find(")", index + 1)
if end < 0 or "(" in line[index + 1 : end]:
raise ValueError("malformed parenthesis comment")
parenthesis_comments.append(line[index + 1 : end])
cleaned[index : end + 1] = " " * (end + 1 - index)
index = end + 1
elif char == ")":
raise ValueError("unmatched parenthesis")
elif char == ";":
semicolon_comment = line[index + 1 :]
cleaned[index:] = " " * (len(line) - index)
break
else:
index += 1
if semicolon_comment is not None:
reject_active_comment(semicolon_comment)
elif parenthesis_comments:
reject_active_comment(parenthesis_comments[-1])
output.append("".join(cleaned) + ending)
return "".join(output)
def parse_nc(text: str):
executable = strip_comments(text)
raw_lines = executable.splitlines()
nonempty = [index for index, line in enumerate(raw_lines) if line.strip()]
percent_lines = [index for index, line in enumerate(raw_lines) if line.strip() == "%"]
if percent_lines and (len(percent_lines) != 2 or percent_lines != [nonempty[0], nonempty[-1]]):
raise ValueError("illegal percent wrapper")
blocks = []
for raw_line in raw_lines:
line = raw_line.strip().upper()
if not line or line == "%":
continue
tokens = []
cursor = 0
for match in WORD_RE.finditer(line):
if line[cursor : match.start()].strip():
raise ValueError("unparsed NC text")
letter = match.group(1).upper()
number_text = match.group(2)
number = float(number_text)
if not math.isfinite(number):
raise ValueError("non-finite NC word")
if letter == "N" and (tokens or not re.fullmatch(r"\d+(?:\.\d+)?", number_text)):
raise ValueError("invalid line number")
tokens.append((letter, number))
cursor = match.end()
if line[cursor:].strip() or not tokens:
raise ValueError("unparsed NC line")
blocks.append(tokens)
if not blocks:
raise ValueError("empty NC")
return blocks
def block_codes(block):
codes = {"G": [], "M": []}
for letter, number in block:
if letter not in codes:
continue
if not close(number, round(number), 1e-9):
raise ValueError("fractional G/M code")
codes[letter].append(int(round(number)))
for letter, groups in (("G", G_MODAL_GROUPS), ("M", M_MODAL_GROUPS)):
values = codes[letter]
if len(values) != len(set(values)):
raise ValueError("duplicate G/M code")
if any(sum(code in group for code in values) > 1 for group in groups):
raise ValueError("conflicting modal codes")
return codes["G"], codes["M"]
def canonical_blocks(text: str):
result = []
position = {axis: None for axis in ("X", "Y", "Z")}
modal_motion = None
modal_feed = None
for block in parse_nc(text):
g_codes, _ = block_codes(block)
words = {}
codes = []
for letter, number in block:
if letter == "N":
continue
if letter in {"G", "M"}:
codes.append((letter, number))
else:
if letter in words:
raise ValueError("duplicate NC word")
words[letter] = number
for code in g_codes:
if code in {0, 1, 2, 3}:
modal_motion = code
if "F" in words:
modal_feed = words["F"]
moved = any(axis in words for axis in position)
for axis in position:
if axis in words:
position[axis] = words[axis]
if moved and modal_motion in {0, 1, 2, 3} and all(value is not None for value in position.values()):
for axis, value in position.items():
words.setdefault(axis, value)
codes = [(letter, number) for letter, number in codes if letter != "G" or int(round(number)) not in {0, 1, 2, 3}]
codes.append(("G", float(modal_motion)))
if modal_motion in {1, 2, 3} and modal_feed is not None:
words.setdefault("F", modal_feed)
normalized = []
for letter, number in codes + list(words.items()):
if letter == "M" and close(number, 30.0, 1e-9):
number = 2.0
if letter in {"G", "M", "T", "H", "O"} and close(number, round(number), 1e-9):
value = str(int(round(number)))
else:
value = f"{number:.9f}".rstrip("0").rstrip(".")
if value in {"-0", "+0"}:
value = "0"
normalized.append(letter + value)
result.append(tuple(sorted(normalized)))
return result
def validate_nc_safety(text: str) -> bool:
try:
blocks = parse_nc(text)
except Exception:
return False
state = {
"units": False,
"absolute": False,
"wcs": False,
"motion": None,
"feed": None,
"speed": None,
"tool": None,
"spindle": False,
"changed": False,
"X": None,
"Y": None,
"Z": None,
}
tool_changes = []
levels = set()
terminators = 0
for block_index, block in enumerate(blocks):
words = {}
try:
g_codes, m_codes = block_codes(block)
except ValueError:
return False
for letter, number in block:
if letter not in {"F", "G", "H", "I", "J", "K", "M", "N", "S", "T", "X", "Y", "Z"}:
return False
if letter not in {"G", "M"}:
if letter in words:
return False
words[letter] = number
if any(code not in {0, 1, 2, 3, 17, 21, 40, 43, 49, 54, 80, 90, 94} for code in g_codes):
return False
if any(code not in {2, 3, 4, 5, 6, 7, 8, 9, 30} for code in m_codes):
return False
if 21 in g_codes:
state["units"] = True
if 90 in g_codes:
state["absolute"] = True
if 54 in g_codes:
state["wcs"] = True
for code in g_codes:
if code in {0, 1, 2, 3}:
state["motion"] = code
if "T" in words:
if not close(words["T"], 1.0, 1e-9):
return False
state["tool"] = 1
if "H" in words and not close(words["H"], 1.0, 1e-9):
return False
if "S" in words:
if not close(words["S"], 7000.0, 1e-6):
return False
state["speed"] = words["S"]
if "F" in words:
if not close(words["F"], 500.0, 1e-4):
return False
state["feed"] = words["F"]
if 5 in m_codes:
state["spindle"] = False
if 6 in m_codes:
if state["spindle"] or state["tool"] != 1:
return False
state["changed"] = True
tool_changes.append(1)
if 3 in m_codes or 4 in m_codes:
if state["speed"] is None or not close(state["speed"], 7000.0):
return False
state["spindle"] = True
before = {axis: state[axis] for axis in ("X", "Y", "Z")}
moved = False
for axis in before:
if axis in words:
state[axis] = words[axis]
moved = True
if moved and state["motion"] in {0, 1, 2, 3}:
if not state["units"] or not state["absolute"] or not state["wcs"]:
return False
if state["motion"] == 0:
if state["Z"] is None:
return False
if before["Z"] is None and state["Z"] < CLEARANCE_Z - 1e-4:
return False
horizontal = (
before["X"] is not None
and before["Y"] is not None
and state["X"] is not None
and state["Y"] is not None
and (not close(before["X"], state["X"]) or not close(before["Y"], state["Y"]))
)
if before["Z"] is not None and min(before["Z"], state["Z"]) < SAFE_Z - 1e-4:
vertical_retract = not horizontal and state["Z"] >= before["Z"] - 1e-6
if not vertical_retract:
return False
else:
if not state["changed"] or not state["spindle"] or state["feed"] is None or state["Z"] is None:
return False
if state["Z"] < FLOOR_Z - 1e-4:
return False
horizontal = (
before["X"] is not None
and before["Y"] is not None
and (not close(before["X"], state["X"]) or not close(before["Y"], state["Y"]))
)
if horizontal and before["Z"] is not None and close(before["Z"], state["Z"], 1e-4):
if close(state["Z"], INTERMEDIATE_Z, 1e-4):
levels.add(INTERMEDIATE_Z)
if close(state["Z"], FLOOR_Z, 1e-4):
levels.add(FLOOR_Z)
if 2 in m_codes or 30 in m_codes:
terminators += 1
if block_index != len(blocks) - 1 or state["spindle"]:
return False
return (
state["units"]
and state["absolute"]
and state["wcs"]
and tool_changes == [1]
and levels == {INTERMEDIATE_Z, FLOOR_Z}
and terminators == 1
)
def valid_postprocessor_args(value: str) -> bool:
try:
arguments = shlex.split(value)
except ValueError:
return False
flags = {
"--no-header",
"--no-comments",
"--line-numbers",
"--no-show-editor",
"--modal",
"--axis-modal",
"--no-tlo",
}
index = 0
while index < len(arguments):
argument = arguments[index]
if argument in flags:
index += 1
continue
if argument == "--precision":
index += 1
if index >= len(arguments) or not re.fullmatch(r"(?:\d|1\d|20)", arguments[index]):
return False
index += 1
continue
if re.fullmatch(r"--precision=(?:\d|1\d|20)", argument):
index += 1
continue
return False
return True
def evaluate_in_freecad() -> bool:
import builtins
builtins.pythonopen = open
import FreeCAD as App
import Part
import Path.Geom as PathGeom
import Path.Post.Command as PathPostCommand
from Path.Post.Processor import PostProcessor
if App.Version()[:4] != ["0", "21", "2", "33771 (Git)"] or App.Version()[-1] != EXPECTED_FREECAD_COMMIT:
return False
if not all(
regular_file(path, maximum)
for path, maximum in (
(PART_PATH, 5 * 1024 * 1024),
(FIXTURE_PATH, 5 * 1024 * 1024),
(FCSTD_PATH, 20 * 1024 * 1024),
(NC_PATH, 5 * 1024 * 1024),
)
):
return False
if not safe_fcstd_container(FCSTD_PATH):
return False
if (
normalized_text_sha256(PART_PATH) != EXPECTED_PART_SHA256
or normalized_text_sha256(FIXTURE_PATH) != EXPECTED_FIXTURE_SHA256
):
return False
part_shape = Part.read(str(PART_PATH))
fixture_shape = Part.read(str(FIXTURE_PATH))
expected_part_shape = expected_part(Part, App)
expected_fixture_shape = expected_fixture(Part, App)
if (
len(part_shape.Solids) != 1
or len(fixture_shape.Solids) != 2
or not shapes_equal(part_shape, expected_part_shape, 1e-3)
or not shapes_equal(fixture_shape, expected_fixture_shape, 1e-3)
or part_shape.common(fixture_shape).Volume > 1e-5
):
return False
document = App.openDocument(str(FCSTD_PATH))
if document is None or "prototype" in str(document.Label).lower():
return False
jobs = [obj for obj in document.Objects if proxy_module(obj) == "Path.Main.Job"]
pockets = [obj for obj in document.Objects if proxy_module(obj) == "Path.Op.PocketShape"]
dressups = [obj for obj in document.Objects if proxy_module(obj) == "Path.Dressup.Boundary"]
stocks = [obj for obj in document.Objects if proxy_module(obj) == "Path.Main.Stock"]
controllers = [obj for obj in document.Objects if proxy_module(obj) == "Path.Tool.Controller"]
tools = [obj for obj in document.Objects if proxy_module(obj) == "Path.Tool.Bit"]
if not all(len(items) == 1 for items in (jobs, pockets, dressups, stocks, controllers, tools)):
return False
job, pocket, dressup, controller, tool = jobs[0], pockets[0], dressups[0], controllers[0], tools[0]
tracked = list(document.Objects)
for obj in tracked:
obj.touch()
document.recompute()
if not all(object_state_clean(obj) for obj in tracked):
return False
if (
list(job.Operations.Group) != [dressup]
or dressup.Base != pocket
or bool(dressup.Inside)
or str(job.PostProcessor).strip().lower() != "linuxcnc"
or bool(job.SplitOutput)
or os.path.normpath(str(job.PostProcessorOutputFile)) != "/home/user/Desktop/task-10.nc"
or not valid_postprocessor_args(str(job.PostProcessorArgs))
or [str(value).strip().upper() for value in job.Fixtures] != ["G54"]
):
return False
if len(job.Model.Group) != 1 or not shapes_equal(job.Model.Group[0].Shape, part_shape, 1e-3):
return False
if not shapes_equal(job.Stock.Shape, part_shape, 1e-3):
return False
fixture_objects = [
obj
for obj in document.Objects
if hasattr(obj, "Shape")
and not obj.Shape.isNull()
and shapes_equal(obj.Shape, fixture_shape, 1e-3)
]
if (
len(fixture_objects) != 1
or job.Model.Group[0] in fixture_objects
):
return False
source_model = job.Model.Group[0]
fixture_object = fixture_objects[0]
if (
controller.Tool != tool
or int(controller.ToolNumber) != 1
or not close(controller.SpindleSpeed, 7000.0)
or str(controller.SpindleDir) != "Forward"
or not close(controller.HorizFeed.getValueAs("mm/min").Value, 500.0)
or not close(controller.VertFeed.getValueAs("mm/min").Value, 500.0)
or pocket.ToolController != controller
or not close(tool.Diameter.Value, TOOL_DIAMETER)
or not close(tool.ShankDiameter.Value, TOOL_DIAMETER)
or str(tool.ShapeName).lower() != "endmill"
):
return False
for obj in (pocket, dressup):
if not linked_to(obj, fixture_object) or not has_scalar_value(obj, FIXTURE_CLEARANCE):
return False
if (
not close(pocket.StartDepth.Value, TOP_Z)
or not close(pocket.FinalDepth.Value, FLOOR_Z)
or not close(pocket.StepDown.Value, 2.5)
or not close(pocket.SafeHeight.Value, SAFE_Z)
or not close(pocket.ClearanceHeight.Value, CLEARANCE_Z)
):
return False
try:
bases = list(pocket.Base)
except Exception:
return False
if len(bases) != 1 or len(bases[0][1]) != 1 or not str(bases[0][1][0]).startswith("Face"):
return False
boundary = bases[0][0]
try:
selected = boundary.Shape.getElement(str(bases[0][1][0]))
except Exception:
return False
expected_boundary = Part.makePlane(50.0, 30.0, App.Vector(-25.0, -15.0, TOP_Z))
if (
selected.BoundBox.ZLength > 1e-5
or selected.cut(expected_boundary).Area > 1e-4
or expected_boundary.cut(selected).Area > 1e-4
):
return False
avoidance = dressup.Stock
if (
avoidance is None
or not avoidance_is_linked_offset(avoidance, fixture_object, fixture_shape, Part, App)
):
return False
minimum_clearance = validate_operation_path(dressup, fixture_shape, Part, App, PathGeom)
if minimum_clearance is None or minimum_clearance < FIXTURE_CLEARANCE - 0.02:
return False
try:
submitted_text = NC_PATH.read_text(encoding="utf-8")
except Exception:
return False
if not validate_nc_safety(submitted_text):
return False
sections = PathPostCommand.buildPostList(job)
if len(sections) != 1 or dressup not in sections[0][1] or pocket in sections[0][1]:
return False
with tempfile.TemporaryDirectory(prefix="engiworld-task10-repost-") as temporary:
repost_path = Path(temporary) / "task-10.nc"
try:
PostProcessor.load("linuxcnc").export(
sections[0][1],
str(repost_path),
str(job.PostProcessorArgs),
)
repost_text = repost_path.read_text(encoding="utf-8")
except BaseException:
return False
if canonical_blocks(submitted_text) != canonical_blocks(repost_text):
return False
return True
def run_outer() -> bool:
trusted_source = globals().get("TRUSTED_EVALUATOR_SOURCE")
if os.geteuid() != 0 or not isinstance(trusted_source, bytes):
return False
try:
if ctypes.CDLL(None).prctl(4, 0, 0, 0, 0) != 0:
return False
except Exception:
return False
try:
executable = FREECADCMD.resolve(strict=True)
info = executable.stat()
bwrap = BWRAP.resolve(strict=True)
bwrap_info = bwrap.stat()
except OSError:
return False
if any(
not stat.S_ISREG(item.st_mode) or item.st_uid != 0 or item.st_mode & 0o022
for item in (info, bwrap_info)
):
return False
try:
with tempfile.TemporaryDirectory(prefix="engiworld-task10-stage-") as stage_text:
stage = Path(stage_text)
pairs = (
(DESKTOP / "part.step", stage / "part.step", 5 * 1024 * 1024),
(DESKTOP / "fixture.step", stage / "fixture.step", 5 * 1024 * 1024),
(DESKTOP / "task-10.FCStd", stage / "task-10.FCStd", 20 * 1024 * 1024),
(DESKTOP / "task-10.nc", stage / "task-10.nc", 5 * 1024 * 1024),
)
if not all(stage_file(source, destination, maximum) for source, destination, maximum in pairs):
return False
evaluator_path = stage / "eval.py"
descriptor = os.open(evaluator_path, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o444)
try:
view = memoryview(trusted_source)
while view:
written = os.write(descriptor, view)
if written <= 0:
return False
view = view[written:]
os.fsync(descriptor)
finally:
os.close(descriptor)
stage.chmod(0o755)
evaluator = "/work/eval.py"
command = (
"import builtins,os; builtins.pythonopen=open; "
"exec(\"try:\\n"
f" ns={{'__name__':'task10_inner','__file__':{evaluator!r}}}\\n"
f" exec(compile(open({evaluator!r}, encoding='utf-8').read(), {evaluator!r}, 'exec'), ns)\\n"
" ok=ns['evaluate_in_freecad']()\\n"
"except BaseException:\\n os._exit(125)\\n"
"os._exit(0 if ok is True else 1)\")"
)
environment = {
"HOME": "/tmp",
"LANG": "C.UTF-8",
"LC_ALL": "C.UTF-8",
"LOGNAME": "user",
"PATH": "/usr/bin:/bin",
"PYTHONNOUSERSITE": "1",
"TMPDIR": "/tmp",
"USER": "user",
"XDG_CACHE_HOME": "/tmp/.cache",
"XDG_CONFIG_HOME": "/tmp/.config",
"ENGIWORLD_TASK10_STAGE": "/work",
}
sandbox = [
str(bwrap),
"--unshare-all",
"--unshare-user",
"--die-with-parent",
"--new-session",
"--cap-drop", "ALL",
"--disable-userns",
"--ro-bind", "/usr", "/usr",
"--symlink", "usr/bin", "/bin",
"--symlink", "usr/lib", "/lib",
"--symlink", "usr/lib64", "/lib64",
"--dir", "/etc",
"--ro-bind", "/etc/fonts", "/etc/fonts",
"--ro-bind", "/etc/group", "/etc/group",
"--ro-bind", "/etc/ld.so.cache", "/etc/ld.so.cache",
"--ro-bind", "/etc/localtime", "/etc/localtime",
"--ro-bind", "/etc/nsswitch.conf", "/etc/nsswitch.conf",
"--ro-bind", "/etc/passwd", "/etc/passwd",
"--proc", "/proc",
"--dev", "/dev",
"--size", str(256 * 1024 * 1024),
"--tmpfs", "/tmp",
"--ro-bind", str(stage), "/work",
"--uid", "1000",
"--gid", "1000",
"--clearenv",
]
for name, value in environment.items():
sandbox.extend(("--setenv", name, value))
sandbox.extend(("--chdir", "/tmp", "--", str(executable), "-c", command))
def apply_limits():
resource.setrlimit(resource.RLIMIT_AS, (3 * 1024**3, 3 * 1024**3))
resource.setrlimit(resource.RLIMIT_CORE, (0, 0))
resource.setrlimit(resource.RLIMIT_CPU, (230, 230))
resource.setrlimit(resource.RLIMIT_FSIZE, (64 * 1024**2, 64 * 1024**2))
resource.setrlimit(resource.RLIMIT_NOFILE, (256, 256))
resource.setrlimit(resource.RLIMIT_NPROC, (128, 128))
completed = subprocess.run(
sandbox,
stdin=subprocess.DEVNULL,
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
timeout=240,
env={"PATH": "/usr/bin:/bin"},
cwd="/",
preexec_fn=apply_limits,
check=False,
)
except Exception:
return False
return completed.returncode == 0
if __name__ == "__main__":
print(True if run_outer() else False)
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