mirror of
https://github.com/wiltodelta/remove-ai-watermarks.git
synced 2026-08-19 12:07:13 +02:00
97 lines
3.0 KiB
Python
97 lines
3.0 KiB
Python
"""Shared fixtures for remove-ai-watermarks test suite."""
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from __future__ import annotations
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import struct
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import zlib
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from pathlib import Path
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import cv2
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import numpy as np
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import pytest
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from PIL import Image
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from PIL.PngImagePlugin import PngInfo
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@pytest.fixture
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def clean_photo(tmp_path: Path) -> Path:
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"""Create a deterministic image with no provenance metadata.
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The assertions using this fixture exercise metadata and provenance behavior,
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so a generated fixture is sufficient and avoids committing personal photos.
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"""
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path = tmp_path / "clean-control.png"
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Image.new("RGB", (128, 96), color=(90, 140, 190)).save(path)
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return path
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@pytest.fixture
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def tmp_image_path(tmp_path: Path) -> Path:
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"""Create a minimal 200x200 test PNG image and return its path."""
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img = np.random.randint(0, 255, (200, 200, 3), dtype=np.uint8)
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path = tmp_path / "test_image.png"
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cv2.imwrite(str(path), img)
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return path
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@pytest.fixture
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def tmp_large_image_path(tmp_path: Path) -> Path:
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"""Create a 1200x1200 test PNG image (triggers large watermark branch)."""
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img = np.random.randint(0, 255, (1200, 1200, 3), dtype=np.uint8)
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path = tmp_path / "test_large.png"
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cv2.imwrite(str(path), img)
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return path
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@pytest.fixture
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def tmp_jpeg_path(tmp_path: Path) -> Path:
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"""Create a minimal JPEG test image."""
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img = np.random.randint(0, 255, (100, 100, 3), dtype=np.uint8)
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path = tmp_path / "test_image.jpg"
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cv2.imwrite(str(path), img)
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return path
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@pytest.fixture
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def tmp_png_with_ai_metadata(tmp_path: Path) -> Path:
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"""Create a PNG with AI-related metadata keys."""
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img = Image.new("RGB", (64, 64), color=(128, 128, 128))
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pnginfo = PngInfo()
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pnginfo.add_text("parameters", "Steps: 20, Sampler: Euler, CFG scale: 7")
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pnginfo.add_text("prompt", "a beautiful landscape")
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pnginfo.add_text("Author", "Test Author")
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path = tmp_path / "ai_metadata.png"
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img.save(path, pnginfo=pnginfo)
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return path
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@pytest.fixture
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def tmp_clean_png(tmp_path: Path) -> Path:
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"""Create a PNG with no AI metadata."""
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img = Image.new("RGB", (64, 64), color=(200, 100, 50))
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pnginfo = PngInfo()
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pnginfo.add_text("Author", "Human Artist")
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pnginfo.add_text("Title", "Test Artwork")
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path = tmp_path / "clean.png"
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img.save(path, pnginfo=pnginfo)
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return path
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@pytest.fixture
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def tampered_chatgpt_png(tmp_path: Path) -> Path:
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"""Add valid PNG metadata after signing so the C2PA asset hash no longer matches."""
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source = Path(__file__).resolve().parents[1] / "data" / "fixtures" / "provenance" / "chatgpt-1.png"
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data = source.read_bytes()
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iend = data.rfind(b"\x00\x00\x00\x00IEND")
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assert iend >= 0
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kind = b"tEXt"
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payload = b"c2pa-test\x00benign post-signing metadata mutation"
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chunk = (
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struct.pack(">I", len(payload)) + kind + payload + struct.pack(">I", zlib.crc32(kind + payload) & 0xFFFFFFFF)
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)
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target = tmp_path / "tampered-chatgpt.png"
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target.write_bytes(data[:iend] + chunk + data[iend:])
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assert target.read_bytes() != data
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return target
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