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48e33eed31
Previously we use `hash_util_encode` to encode channel and topic names to be URL compatible. This uses the more capable `encode_hash_component` from the recently added `topic_link_utils.py` module. It also moves the function to `url_encoding.py`
89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
# Keep this synchronized with web/src/topic_link_util.ts
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import re
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from zerver.lib.url_encoding import encode_channel, encode_hash_component
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from zerver.models.messages import Message
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invalid_stream_topic_regex = re.compile(r"[`>*&\[\]]|(\$\$)")
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def will_produce_broken_stream_topic_link(word: str) -> bool:
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return bool(invalid_stream_topic_regex.search(word))
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escape_mapping = {
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"`": "`",
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">": ">",
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"*": "*",
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"&": "&",
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"$$": "$$",
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"[": "[",
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"]": "]",
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}
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def escape_invalid_stream_topic_characters(text: str) -> str:
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return re.sub(
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invalid_stream_topic_regex,
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lambda match: escape_mapping.get(match.group(0), match.group(0)),
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text,
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)
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def get_fallback_markdown_link(
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stream_id: int, stream_name: str, topic_name: str | None = None, message_id: int | None = None
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) -> str:
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"""
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Helper that should only be called by other methods in this file.
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Generates the vanilla markdown link syntax for a stream/topic/message link, as
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a fallback for cases where the nicer Zulip link syntax would not
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render properly due to special characters in the channel or topic name.
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"""
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escape = escape_invalid_stream_topic_characters
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link = f"#narrow/channel/{encode_channel(stream_id, stream_name)}"
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text = f"#{escape(stream_name)}"
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if topic_name is not None:
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link += f"/topic/{encode_hash_component(topic_name)}"
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if topic_name == "":
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topic_name = Message.EMPTY_TOPIC_FALLBACK_NAME
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text += f" > {escape(topic_name)}"
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if message_id is not None:
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link += f"/near/{message_id}"
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text += " @ 💬"
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return f"[{text}]({link})"
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def get_message_link_syntax(
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stream_id: int, stream_name: str, topic_name: str, message_id: int
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) -> str:
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# If the stream/topic name is such that it will
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# generate an invalid #**stream>topic@message_id** syntax,
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# we revert to generating the normal markdown syntax for a link.
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if will_produce_broken_stream_topic_link(topic_name) or will_produce_broken_stream_topic_link(
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stream_name
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):
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return get_fallback_markdown_link(stream_id, stream_name, topic_name, message_id)
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return f"#**{stream_name}>{topic_name}@{message_id}**"
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def get_stream_topic_link_syntax(stream_id: int, stream_name: str, topic_name: str) -> str:
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# If the stream/topic name is such that it will generate an invalid #**stream>topic** syntax,
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# we revert to generating the normal markdown syntax for a link.
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if will_produce_broken_stream_topic_link(topic_name) or will_produce_broken_stream_topic_link(
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stream_name
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):
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return get_fallback_markdown_link(stream_id, stream_name, topic_name)
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return f"#**{stream_name}>{topic_name}**"
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def get_stream_link_syntax(stream_id: int, stream_name: str) -> str:
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# If the stream name is such that it will generate an invalid #**stream** syntax,
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# we revert to generating the normal markdown syntax for a link.
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if will_produce_broken_stream_topic_link(stream_name):
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return get_fallback_markdown_link(stream_id, stream_name)
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return f"#**{stream_name}**"
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