52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
from re import match
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from typing import List, Optional
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from scrapthechan.fileinfo import FileInfo
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from scrapthechan.parser import Parser
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__all__ = ["FourChanParser"]
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class FourChanParser(Parser):
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"""JSON parser for 4chan.org image board."""
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__url_thread_json = "https://a.4cdn.org/{board}/thread/{thread}.json"
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__url_file_link = "https://i.4cdn.org/{board}/{filename}"
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def __init__(self, board: str, thread: str,
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skip_posts: Optional[int] = None) -> None:
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posts = self._get_json(self.__url_thread_json.format(board=board, \
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thread=thread))['posts']
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super(FourChanParser, self).__init__(board, thread, posts, skip_posts)
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@property
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def imageboard(self) -> str:
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return "4chan.org"
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@property
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def op(self) -> Optional[str]:
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op = ""
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if 'sub' in self._op_post:
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op = f"{self._op_post['sub']}\n"
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if 'com' in self._op_post:
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op += self._op_post['com']
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return op if not op == "" else None
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def _parse_post(self, post: dict) -> List[FileInfo]:
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if not 'tim' in post: return None
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dlfname = f"{post['tim']}{post['ext']}"
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if "filename" in post:
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if match(post['filename'], r"^image\.\w{1,4}$") is None:
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filename = dlfname
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else:
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filename = f"{post['filename']}{post['ext']}"
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# Hash algorithm is hardcoded since it is highly unlikely that it will
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# be changed in foreseeable future. And if it'll change then this line
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# will be necessarily updated anyway.
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return [FileInfo(filename, post['fsize'],
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self.__url_file_link.format(board=self.board, filename=dlfname),
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post['md5'], 'md5')]
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