Vito Sansevero
baf788b863
R3: an accumulating batch saver repeats the A1111 parameters record once per batch item, identical except "Batch index: N". The bounded PNG reader now keeps the last copy (Pillow's rule, which #165 relied on) instead of calling the file unreadable. Any other difference, including a missing or second batch index, is still a conflict, and decoding the copies draws from the duplicate role budget. R4: parameters text that starts with "Negative prompt:" has an empty positive (#165), instead of showing the delimiter line as the positive. R5: the settings footer may be followed by sd-dynamic-prompts' one-line "Template:" and "Negative Template:" records, and may be "Steps: N" alone when there is no full footer. R10: commas inside A1111's quoted settings values no longer split them, so an "ADetailer prompt" with a comma keeps the other facts known. The facts' A1111 reader mirrors R4, R5 and R10; the default (ingestion) profile keeps the historical split. Also from the Task 2.7 review: a guard test fails on any uncoded unresolved reason without a user line (M1), and the encoder bounds role lines to the client's 512 code units (M4).
577 lines
22 KiB
Python
577 lines
22 KiB
Python
"""Read prompt evidence without inference, indexing, or decoding image pixels."""
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import hashlib
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import io
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import json
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import re
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import struct
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import subprocess # nosec B404
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import threading
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import zlib
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from dataclasses import dataclass, field as dataclass_field
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from pathlib import Path
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from typing import Any
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from PIL import Image
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from .inspection_outcomes import UNREADABLE_METADATA_REASON, outcome_message
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from .pair_execution import EXECUTION_KEY
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from .prompt_pair_resolver import (
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EMPTY_POSITIVE_REASON,
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INSPECTION_PROFILE,
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ResolverProfile,
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resolve_prompt_pair,
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)
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from .video_metadata import ffprobe_path, is_video_path
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# Role records (prompt, parameters, the pair execution record) share one
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# budget, encoded and decoded: roles cannot be trusted from a partial record,
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# so exceeding it fails the whole read. A workflow has its own budget; past it
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# only the workflow is ``limited``. Other text chunks are never retained.
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ROLE_METADATA_BYTES = 2 * 1024 * 1024
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WORKFLOW_METADATA_BYTES = 4 * 1024 * 1024
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# Total bytes read for byte-identical duplicate chunks of one file, per class
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# so workflow repeats can never starve role records: two budgets each, making
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# repeated chunks cost bounded I/O instead of file size.
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DUPLICATE_WORKFLOW_BYTES = 2 * WORKFLOW_METADATA_BYTES
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DUPLICATE_ROLE_BYTES = 2 * ROLE_METADATA_BYTES
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MAX_METADATA_BYTES = ROLE_METADATA_BYTES # video stdout bound, unchanged here
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MAX_KEYWORD_BYTES = 80 # a 1-79 byte PNG keyword plus its NUL separator
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MAX_HEADER_BYTES = 8 * 1024 * 1024
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MAX_PNG_CHUNKS = 10_000
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_ROLE_METADATA_KEYS = frozenset({"prompt", "parameters", EXECUTION_KEY})
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_METADATA_KEYS = _ROLE_METADATA_KEYS | {"workflow"}
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_TEXT_CHUNKS = (b"tEXt", b"zTXt", b"iTXt")
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# An accumulating batch saver writes one A1111 ``parameters`` record per batch
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# item, identical except this field (R3); Pillow keeps the last one.
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_BATCH_INDEX = re.compile(r"(?m)(?:^|(?<=, ))Batch index: \d+(?=, |$)")
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_SIGNATURE = b"\x89PNG\r\n\x1a\n"
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class MetadataReadError(ValueError):
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"""Prompt evidence is unreadable, incomplete, or exceeds inspection limits."""
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@dataclass(frozen=True)
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class InspectionRead:
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"""One bounded read, with its transient exact video source kept private."""
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metadata: dict[str, str]
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record_formats: dict[str, str]
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video_carrier_text: str | None
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format: str | None
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width: int | None
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height: int | None
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# Records present but over their budget: no text, format ``limited``.
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limited_records: frozenset[str] = dataclass_field(default_factory=frozenset)
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@dataclass(frozen=True)
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class _VideoInspection:
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metadata: dict[str, str | None]
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record_formats: dict[str, str]
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carrier_text: str | None
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def _inflate(data: bytes, limit: int) -> bytes | None:
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"""Inflate at most ``limit + 1`` bytes; ``None`` when the output is over limit."""
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inflater = zlib.decompressobj()
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result = inflater.decompress(data, limit + 1)
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if len(result) > limit:
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return None
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if not inflater.eof or inflater.unused_data:
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raise MetadataReadError("Compressed metadata is invalid or exceeds limits")
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return result
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def _keyword(prefix: bytes) -> str:
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keyword, separator, _ = prefix.partition(b"\0")
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if not separator or not 1 <= len(keyword) <= 79:
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raise MetadataReadError("Malformed PNG text metadata")
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return keyword.decode("latin-1")
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def _png_text(kind: bytes, data: bytes, limit: int) -> tuple[str, str | None]:
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"""Decode one retained text chunk; ``None`` text when it inflates past limit."""
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_, _, body = data.partition(b"\0")
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key = _keyword(data[:MAX_KEYWORD_BYTES])
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encoding = "latin-1"
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if kind == b"zTXt":
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if not body or body[0] != 0:
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raise MetadataReadError("Unsupported PNG text compression")
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body = _inflate(body[1:], limit)
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elif kind == b"iTXt":
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if len(body) < 2 or body[0] not in (0, 1):
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raise MetadataReadError("Malformed international PNG metadata")
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flag, method = body[:2]
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fields = body[2:].split(b"\0", 2)
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if len(fields) != 3 or (flag and method != 0):
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raise MetadataReadError("Malformed international PNG metadata")
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fields[0].decode("ascii")
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fields[1].decode("utf-8")
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body = _inflate(fields[2], limit) if flag else fields[2]
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encoding = "utf-8"
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if body is None:
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return key, None
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if b"\0" in body:
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raise MetadataReadError("Malformed PNG text metadata")
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return key, body.decode(encoding)
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class _PngRecords:
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"""Retained records with per-class budgets and byte-identical duplicates."""
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def __init__(self) -> None:
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self.found: dict[str, str] = {}
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self.limited: set[str] = set()
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self.digests: dict[str, tuple[int, bytes]] = {}
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self.role_encoded = self.role_decoded = 0
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self.duplicate_workflow = self.duplicate_role = 0
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self.duplicate_decoded = 0
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def skip(self, key: str, length: int) -> bool:
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"""Decide from the keyword and length alone whether to seek past a chunk."""
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if key not in _METADATA_KEYS or key in self.limited:
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return True # never retained, or a duplicate of a limited workflow
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if key in self.digests:
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if self.digests[key][0] != length and key != "parameters":
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raise MetadataReadError("Duplicate prompt metadata")
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if key == "workflow":
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if self.duplicate_workflow + length > DUPLICATE_WORKFLOW_BYTES:
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self.limited.add(key)
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self.found.pop(key, None)
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return True
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self.duplicate_workflow += length
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else:
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if self.duplicate_role + length > DUPLICATE_ROLE_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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self.duplicate_role += length
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return False # same length: read and compare bytes
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if key == "workflow":
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if length > WORKFLOW_METADATA_BYTES:
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self.limited.add(key)
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return True
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return False
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self.role_encoded += length
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if self.role_encoded > ROLE_METADATA_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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return False
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def add(self, kind: bytes, data: bytes) -> None:
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key = _keyword(data[:MAX_KEYWORD_BYTES])
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digest = hashlib.sha256(kind + data).digest()
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if key in self.digests:
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if self.digests[key][1] != digest:
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if key != "parameters":
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raise MetadataReadError("Duplicate prompt metadata")
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self.batch_copy(kind, data)
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# The kept copy is the last one; later repeats compare with it.
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self.digests[key] = (len(data), digest)
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return
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self.digests[key] = (len(data), digest)
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workflow = key == "workflow"
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limit = (
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WORKFLOW_METADATA_BYTES
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if workflow
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else ROLE_METADATA_BYTES - self.role_decoded
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)
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_, value = _png_text(kind, data, limit)
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size = None if value is None else len(value.encode("utf-8"))
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if workflow:
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if size is None or size > WORKFLOW_METADATA_BYTES:
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self.limited.add(key)
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return
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else:
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self.role_decoded += limit + 1 if size is None else size
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if self.role_decoded > ROLE_METADATA_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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self.found[key] = value
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def batch_copy(self, kind: bytes, data: bytes) -> None:
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"""Keep a later ``parameters`` copy that differs only in its batch index.
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Each copy must carry exactly one ``Batch index: N`` settings field; any
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other difference is still a conflict. Decoding every copy draws from the
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duplicate role budget, so small compressed copies stay bounded.
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"""
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_, value = _png_text(kind, data, ROLE_METADATA_BYTES)
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size = ROLE_METADATA_BYTES + 1 if value is None else len(value.encode())
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self.duplicate_decoded += size
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if value is None or self.duplicate_decoded > DUPLICATE_ROLE_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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kept = self.found["parameters"]
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normalized = [
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_BATCH_INDEX.subn("Batch index: #", text) for text in (kept, value)
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]
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if normalized[0] != normalized[1] or normalized[0][1] != 1:
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raise MetadataReadError("Duplicate prompt metadata")
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self.role_decoded += max(0, size - len(kept.encode()))
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if self.role_decoded > ROLE_METADATA_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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self.found["parameters"] = value
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def _png_metadata(stream: Any, size: int) -> tuple[dict, frozenset, int, int]:
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"""CRC-check retained text and structural chunks, seeking past everything else.
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PNG text chunks may follow IDAT. Pillow's ``.text`` loads pixels to find
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them; this bounded reader instead follows the W3C PNG chunk layout. A text
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chunk's keyword is read first (at most ``MAX_KEYWORD_BYTES``); chunks that
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are not retained, or are over their budget, are skipped by length, so their
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bytes are never held in memory or checksummed. IDAT checksums/pixel
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validity are deliberately outside metadata inspection.
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"""
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records = _PngRecords()
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saw_header = saw_pixels = False
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for index in range(MAX_PNG_CHUNKS):
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header = stream.read(8)
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if len(header) != 8:
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raise MetadataReadError("Incomplete PNG metadata")
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length, kind = struct.unpack(">I4s", header)
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if length > 0x7FFFFFFF or stream.tell() + length + 4 > size:
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raise MetadataReadError("Incomplete PNG chunk")
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if index == 0 and (kind != b"IHDR" or length != 13):
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raise MetadataReadError("Missing PNG header")
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if kind in _TEXT_CHUNKS:
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prefix = stream.read(min(length, MAX_KEYWORD_BYTES))
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if records.skip(_keyword(prefix), length):
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stream.seek(length - len(prefix) + 4, 1)
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continue
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data = prefix + stream.read(length - len(prefix))
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elif kind in (b"IHDR", b"IEND"):
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data = stream.read(length)
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else:
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saw_pixels |= kind == b"IDAT"
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stream.seek(length + 4, 1)
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continue
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checksum = stream.read(4)
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if zlib.crc32(kind + data) != int.from_bytes(checksum, "big"):
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raise MetadataReadError("PNG metadata checksum mismatch")
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if kind == b"IHDR":
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if saw_header or not all(struct.unpack(">II", data[:8])):
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raise MetadataReadError("Malformed PNG header")
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saw_header = True
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width, height = struct.unpack(">II", data[:8])
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elif kind == b"IEND":
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if length or not saw_pixels:
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raise MetadataReadError("Incomplete PNG image")
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return records.found, frozenset(records.limited), width, height
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else:
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records.add(kind, data)
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raise MetadataReadError("PNG chunk count exceeds inspection limits")
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def _video_metadata(path: Path) -> _VideoInspection:
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probe = ffprobe_path()
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if not probe:
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raise MetadataReadError("Video metadata reader is unavailable")
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command = [
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probe,
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"-v",
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"quiet",
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"-show_entries",
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"format_tags=comment,description",
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"-of",
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"json",
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str(path),
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]
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process = subprocess.Popen( # nosec B603
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command,
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stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL,
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creationflags=getattr(subprocess, "CREATE_NO_WINDOW", 0),
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)
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def stop() -> None:
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if process.poll() is None:
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try:
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process.kill()
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except OSError:
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# Timeout and final cleanup can race with the process exiting.
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pass
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timer = threading.Timer(3, stop)
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timer.daemon = True
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timer.start()
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try:
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raw = process.stdout.read(MAX_METADATA_BYTES + 1)
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if len(raw) > MAX_METADATA_BYTES:
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raise MetadataReadError("Video metadata exceeds inspection limits")
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process.wait()
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if process.returncode:
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raise MetadataReadError("Video metadata could not be read")
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finally:
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timer.cancel()
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stop()
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process.wait()
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process.stdout.close()
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probed = json.loads(raw)
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if not isinstance(probed, dict) or not isinstance(probed.get("format"), dict):
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raise MetadataReadError("Malformed video metadata")
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tags = probed["format"].get("tags", {})
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if not isinstance(tags, dict):
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raise MetadataReadError("Malformed video metadata")
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# The scan normalizer drops null fields and unknown keys. Inspection must
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# retain explicit prompt/execution markers so malformed evidence cannot
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# silently fall back to an unrelated saved recipe or another comment.
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candidates = []
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for key in ("comment", "description"):
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raw = tags.get(key)
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if not isinstance(raw, str):
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continue
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try:
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envelope = json.loads(raw)
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except ValueError:
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continue
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if not isinstance(envelope, dict):
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continue
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candidates.append((raw, envelope))
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selected = next(
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(item for item in candidates if _ROLE_METADATA_KEYS.intersection(item[1])),
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None,
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)
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if selected is None:
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selected = next((item for item in candidates if "workflow" in item[1]), None)
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if selected is not None:
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raw, envelope = selected
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metadata, formats = {}, {}
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for field in _METADATA_KEYS.intersection(envelope):
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value = envelope[field]
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if field == "workflow" and not isinstance(value, (str, dict)):
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formats[field] = "invalid"
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continue
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metadata[field] = (
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value if value is None or isinstance(value, str) else json.dumps(value)
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)
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formats[field] = (
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"original-text" if isinstance(value, str) else "reserialized-json"
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)
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return _VideoInspection(metadata, formats, raw)
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return _VideoInspection({}, {}, None)
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def read_inspection_file(path: Path) -> InspectionRead:
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"""Read bounded metadata and header facts without decoding media pixels."""
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try:
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formats, carrier, limited = {}, None, frozenset()
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format_name = width = height = None
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if is_video_path(path):
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video = _video_metadata(path)
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metadata, formats, carrier = (
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video.metadata,
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video.record_formats,
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video.carrier_text,
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)
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else:
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with path.open("rb") as stream:
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signature = stream.read(8)
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if signature == _SIGNATURE:
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metadata, limited, width, height = _png_metadata(
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stream, path.stat().st_size
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)
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format_name = "PNG"
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else:
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stream.seek(0)
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header = stream.read(MAX_HEADER_BYTES)
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with Image.open(io.BytesIO(header)) as image:
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metadata = dict(image.info)
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format_name, (width, height) = image.format, image.size
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result, role_size, limited = {}, 0, set(limited)
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for key in _METADATA_KEYS:
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if key not in metadata:
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continue
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value = metadata[key]
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if key == "workflow" and not isinstance(value, str):
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formats[key] = "invalid"
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continue
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if not isinstance(value, str):
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raise MetadataReadError("Malformed prompt metadata")
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size = len(value.encode("utf-8", "surrogatepass"))
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if key == "workflow":
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if size > WORKFLOW_METADATA_BYTES:
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limited.add(key)
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continue
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else:
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role_size += size
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if role_size > ROLE_METADATA_BYTES:
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raise MetadataReadError("Metadata exceeds inspection limits")
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result[key] = value
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formats.setdefault(key, "original-text")
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if _ROLE_METADATA_KEYS.intersection(limited):
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# A limited role record would vanish and let fallback evidence win.
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raise MetadataReadError("Metadata exceeds inspection limits")
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for key in limited:
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formats[key] = "limited"
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return InspectionRead(
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result,
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formats,
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carrier,
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format_name,
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width,
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height,
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frozenset(limited),
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)
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except MetadataReadError:
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raise
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except (
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OSError,
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ValueError,
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EOFError,
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SyntaxError,
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RecursionError,
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struct.error,
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zlib.error,
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):
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raise MetadataReadError("Media metadata could not be read") from None
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def read_inspection_metadata(path: Path) -> dict[str, str]:
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"""Compatible metadata-only projection of the single inspection read."""
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return read_inspection_file(path).metadata
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def _side(status: str, text: str | None = None, source: str | None = None) -> dict:
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return {"status": status, "text": text, "source": source}
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_EMPTY_POSITIVE = outcome_message(
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{"state": "unresolved", "reason": EMPTY_POSITIVE_REASON}
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)
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def _explained(prompts: dict, resolution: dict) -> dict:
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"""Each unresolved role carries the outcome's line; other roles are kept."""
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message = outcome_message(resolution)
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if message is None:
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return prompts
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return {
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role: (
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{**side, "message": message}
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if side["status"] == "unresolved" and "message" not in side
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else side
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)
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for role, side in prompts.items()
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}
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def unreadable_evidence() -> dict:
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"""Both roles when the file's metadata could not be read at all."""
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resolution = {
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"state": "unresolved",
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"sampler_id": None,
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"reason": UNREADABLE_METADATA_REASON,
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"reason_code": None,
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"node": None,
|
|
}
|
|
prompts = {role: _side("unresolved") for role in ("positive", "negative")}
|
|
return {"prompts": _explained(prompts, resolution), "resolution": resolution}
|
|
|
|
|
|
def _parsed_workflow(value: Any) -> dict | None:
|
|
"""The UI workflow as an object, or ``None`` (absent, invalid or not JSON)."""
|
|
if isinstance(value, str):
|
|
try:
|
|
value = json.loads(value)
|
|
except (ValueError, RecursionError):
|
|
return None
|
|
return value if isinstance(value, dict) else None
|
|
|
|
|
|
def inspect_prompt_evidence(
|
|
metadata: dict,
|
|
saved: dict | None = None,
|
|
*,
|
|
profile: ResolverProfile = INSPECTION_PROFILE,
|
|
) -> dict:
|
|
"""Keep uncertainty visible; a saved association never replaces file evidence.
|
|
|
|
Inspection routes resolve with ``INSPECTION_PROFILE``: bounded work, not
|
|
graph size. Ingestion (scan, live monitor, admin import) calls the resolver
|
|
directly with its default profile. ``resolution`` carries the closed
|
|
``reason_code`` and, for a blocking node, ``node: {id, class_type}``.
|
|
"""
|
|
workflow = metadata.get("workflow")
|
|
metadata = {
|
|
key: value for key, value in metadata.items() if key in _ROLE_METADATA_KEYS
|
|
}
|
|
resolution = {
|
|
"state": "unresolved",
|
|
"sampler_id": None,
|
|
"reason": "Prompt evidence is malformed",
|
|
"reason_code": "malformed",
|
|
"node": None,
|
|
}
|
|
if not metadata:
|
|
result = {role: _side("absent") for role in ("positive", "negative")}
|
|
if saved:
|
|
context = saved.get("pair_context")
|
|
paired = isinstance(saved.get("pair"), dict) or isinstance(context, dict)
|
|
for role in ("positive", "negative") if paired else ("positive",):
|
|
result[role] = {
|
|
**_side("unresolved", source="saved-association"),
|
|
"message": (
|
|
"A saved library association exists, but it cannot be "
|
|
"verified against this file."
|
|
),
|
|
}
|
|
return {
|
|
"prompts": result,
|
|
"resolution": {
|
|
"state": "absent",
|
|
"sampler_id": None,
|
|
"reason": "No parsed prompt metadata",
|
|
"reason_code": None,
|
|
"node": None,
|
|
},
|
|
}
|
|
canonical = dict(metadata)
|
|
malformed = {
|
|
"prompts": _explained(
|
|
{role: _side("unresolved") for role in ("positive", "negative")},
|
|
resolution,
|
|
),
|
|
"resolution": resolution,
|
|
}
|
|
if "prompt" not in canonical and "parameters" not in canonical:
|
|
return malformed
|
|
if isinstance(canonical.get("prompt"), str):
|
|
try:
|
|
canonical["prompt"] = json.loads(canonical["prompt"])
|
|
except (ValueError, RecursionError):
|
|
return malformed
|
|
workflow = _parsed_workflow(workflow)
|
|
if workflow is not None and "prompt" in canonical:
|
|
# Only to recognize overwritten PromptManager text (R1); never a role.
|
|
canonical["workflow"] = workflow
|
|
resolved = resolve_prompt_pair(canonical, profile=profile)
|
|
state = resolved["state"]
|
|
result = {}
|
|
for role in ("positive", "negative"):
|
|
side = resolved[role]
|
|
if (
|
|
state != "ambiguous"
|
|
and isinstance(side, dict)
|
|
and (role == "negative" or side["text"].strip())
|
|
):
|
|
result[role] = _side(
|
|
"resolved", side["text"], side["provenance"]["text_source"]
|
|
)
|
|
elif state == "resolved" and isinstance(side, dict):
|
|
# A resolved pair withholds only an empty positive.
|
|
result[role] = {**_side("unresolved"), "message": _EMPTY_POSITIVE}
|
|
else:
|
|
result[role] = _side(state if state != "resolved" else "unresolved")
|
|
resolution = {
|
|
"state": state,
|
|
"sampler_id": resolved.get("sampler_id"),
|
|
"reason": resolved.get("reason", ""),
|
|
"reason_code": resolved.get("reason_code"),
|
|
"node": resolved.get("node"),
|
|
}
|
|
return {"prompts": _explained(result, resolution), "resolution": resolution}
|
|
|
|
|
|
def inspect_prompt_roles(metadata: dict, saved: dict | None = None) -> dict:
|
|
"""Keep the established role-only helper contract."""
|
|
return inspect_prompt_evidence(metadata, saved)["prompts"]
|