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62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
from urllib.parse import urlsplit
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from bs4.element import Tag
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from typing_extensions import override
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from zerver.lib.url_preview.parsers.base import BaseParser
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from zerver.lib.url_preview.types import UrlEmbedData
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class GenericParser(BaseParser):
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@override
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def extract_data(self) -> UrlEmbedData:
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return UrlEmbedData(
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title=self._get_title(),
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description=self._get_description(),
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image=self._get_image(),
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)
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def _get_title(self) -> str | None:
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soup = self._soup
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if soup.title and soup.title.text != "":
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return soup.title.text
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if soup.h1 and soup.h1.text != "":
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return soup.h1.text
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return None
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def _get_description(self) -> str | None:
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soup = self._soup
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meta_description = soup.find("meta", attrs={"name": "description"})
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if isinstance(meta_description, Tag) and meta_description.get("content", "") != "":
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assert isinstance(meta_description["content"], str)
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return meta_description["content"]
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first_h1 = soup.find("h1")
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if first_h1:
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first_p = first_h1.find_next("p")
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if first_p and first_p.text != "":
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return first_p.text
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first_p = soup.find("p")
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if first_p and first_p.text != "":
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return first_p.text
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return None
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def _get_image(self) -> str | None:
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"""
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Finding a first image after the h1 header.
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Presumably it will be the main image.
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"""
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soup = self._soup
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first_h1 = soup.find("h1")
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if first_h1:
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first_image = first_h1.find_next_sibling("img", src=True)
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if isinstance(first_image, Tag) and first_image["src"] != "":
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assert isinstance(first_image["src"], str)
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try:
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# We use urlsplit and not URLValidator because we
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# need to support relative URLs.
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urlsplit(first_image["src"])
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except ValueError:
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return None
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return first_image["src"]
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return None
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