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70 lines
1.9 KiB
Python
70 lines
1.9 KiB
Python
"""Utility functions shared by the partner channel layer."""
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from datetime import datetime
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from pathlib import Path
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import re
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def detect_image_mime(data: bytes) -> str | None:
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"""Detect image MIME type from magic bytes, ignoring file extension."""
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if data[:8] == b"\x89PNG\r\n\x1a\n":
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return "image/png"
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if data[:3] == b"\xff\xd8\xff":
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return "image/jpeg"
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if data[:6] in (b"GIF87a", b"GIF89a"):
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return "image/gif"
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if data[:4] == b"RIFF" and data[8:12] == b"WEBP":
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return "image/webp"
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return None
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def ensure_dir(path: Path) -> Path:
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"""Ensure directory exists, return it."""
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path.mkdir(parents=True, exist_ok=True)
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return path
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def timestamp() -> str:
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"""Current ISO timestamp."""
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return datetime.now().isoformat()
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_UNSAFE_CHARS = re.compile(r'[<>:"/\\|?*]')
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def safe_filename(name: str) -> str:
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"""Replace unsafe path characters with underscores."""
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return _UNSAFE_CHARS.sub("_", name).strip()
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def split_message(content: str, max_len: int = 2000) -> list[str]:
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"""
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Split content into chunks within max_len, preferring line breaks.
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Args:
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content: The text content to split.
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max_len: Maximum length per chunk (default 2000 for Discord compatibility).
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Returns:
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List of message chunks, each within max_len.
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"""
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if not content:
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return []
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if len(content) <= max_len:
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return [content]
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chunks: list[str] = []
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while content:
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if len(content) <= max_len:
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chunks.append(content)
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break
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cut = content[:max_len]
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# Try to break at newline first, then space, then hard break
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pos = cut.rfind("\n")
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if pos <= 0:
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pos = cut.rfind(" ")
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if pos <= 0:
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pos = max_len
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chunks.append(content[:pos])
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content = content[pos:].lstrip()
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return chunks
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