ad842ee8a5
- Added type hinting (for now, 3.5-compatible) - Split `db` namespace into `db` module and `model` namespace - Changed elastic search to be created lazily for each operation - Changed to class based approach in entity serialization to allow stronger typing - Removed `required` argument from `context.get_*` family of functions; now it's implied if `default` argument is omitted - Changed `unalias_dict` implementation to use less magic inputs
59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
import re
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from typing import Optional
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def get_mime_type(content: bytes) -> str:
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if not content:
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return 'application/octet-stream'
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if content[0:3] in (b'CWS', b'FWS', b'ZWS'):
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return 'application/x-shockwave-flash'
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if content[0:3] == b'\xFF\xD8\xFF':
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return 'image/jpeg'
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if content[0:6] == b'\x89PNG\x0D\x0A':
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return 'image/png'
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if content[0:6] in (b'GIF87a', b'GIF89a'):
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return 'image/gif'
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if content[0:4] == b'\x1A\x45\xDF\xA3':
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return 'video/webm'
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if content[4:12] in (b'ftypisom', b'ftypmp42'):
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return 'video/mp4'
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return 'application/octet-stream'
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def get_extension(mime_type: str) -> Optional[str]:
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extension_map = {
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'application/x-shockwave-flash': 'swf',
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'image/gif': 'gif',
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'image/jpeg': 'jpg',
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'image/png': 'png',
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'video/mp4': 'mp4',
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'video/webm': 'webm',
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'application/octet-stream': 'dat',
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}
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return extension_map.get((mime_type or '').strip().lower(), None)
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def is_flash(mime_type: str) -> bool:
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return mime_type.lower() == 'application/x-shockwave-flash'
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def is_video(mime_type: str) -> bool:
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return mime_type.lower() in ('application/ogg', 'video/mp4', 'video/webm')
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def is_image(mime_type: str) -> bool:
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return mime_type.lower() in ('image/jpeg', 'image/png', 'image/gif')
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def is_animated_gif(content: bytes) -> bool:
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pattern = b'\x21\xF9\x04[\x00-\xFF]{4}\x00[\x2C\x21]'
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return get_mime_type(content) == 'image/gif' \
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and len(re.findall(pattern, content)) > 1
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