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27 lines
936 B
Python
27 lines
936 B
Python
from urllib.parse import urlsplit
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from django.conf import settings
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def is_same_server_message_link(url: str) -> bool:
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split_result = urlsplit(url)
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hostname = split_result.hostname
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fragment = split_result.fragment
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if hostname not in {None, settings.EXTERNAL_HOST_WITHOUT_PORT}:
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return False
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# A message link always has category `narrow`, section `channel`
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# or `dm`, and ends with `/near/<message_id>`, where <message_id>
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# is a sequence of digits. The URL fragment of a message link has
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# at least 5 parts. e.g. '#narrow/dm/9,15-dm/near/43'
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fragment_parts = fragment.split("/")
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if len(fragment_parts) < 5:
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return False
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category = fragment_parts[0]
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section = fragment_parts[1]
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ends_with_near_message_id = fragment_parts[-2] == "near" and fragment_parts[-1].isdigit()
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return category == "narrow" and section in {"channel", "dm"} and ends_with_near_message_id
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