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76deb30312
We don't want really long urls to lead to truncated keys, or we could theoretically have two different urls get mixed up previews. Also, this suppresses warnings about exceeding the 250 char limit. Finally, this gives the key a proper prefix.
60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
import re
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import logging
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import traceback
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from typing import Any, Optional, Dict
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from typing.re import Match
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import requests
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from zerver.lib.cache import cache_with_key, get_cache_with_key, preview_url_cache_key
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from zerver.lib.url_preview.oembed import get_oembed_data
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from zerver.lib.url_preview.parsers import OpenGraphParser, GenericParser
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from django.utils.encoding import smart_text
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CACHE_NAME = "database"
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# Based on django.core.validators.URLValidator, with ftp support removed.
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link_regex = re.compile(
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r'^(?:http)s?://' # http:// or https://
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r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' # domain...
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r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
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r'(?::\d+)?' # optional port
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r'(?:/?|[/?]\S+)$', re.IGNORECASE)
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def is_link(url: str) -> Match[str]:
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return link_regex.match(smart_text(url))
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@cache_with_key(preview_url_cache_key, cache_name=CACHE_NAME, with_statsd_key="urlpreview_data")
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def get_link_embed_data(url: str,
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maxwidth: Optional[int]=640,
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maxheight: Optional[int]=480) -> Optional[Dict[str, Any]]:
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if not is_link(url):
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return None
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# Fetch information from URL.
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# We are using three sources in next order:
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# 1. OEmbed
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# 2. Open Graph
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# 3. Meta tags
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try:
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data = get_oembed_data(url, maxwidth=maxwidth, maxheight=maxheight)
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except requests.exceptions.RequestException:
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msg = 'Unable to fetch information from url {0}, traceback: {1}'
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logging.error(msg.format(url, traceback.format_exc()))
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return None
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data = data or {}
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response = requests.get(url)
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if response.ok:
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og_data = OpenGraphParser(response.text).extract_data()
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if og_data:
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data.update(og_data)
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generic_data = GenericParser(response.text).extract_data() or {}
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for key in ['title', 'description', 'image']:
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if not data.get(key) and generic_data.get(key):
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data[key] = generic_data[key]
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return data
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@get_cache_with_key(preview_url_cache_key, cache_name=CACHE_NAME)
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def link_embed_data_from_cache(url: str, maxwidth: Optional[int]=640, maxheight: Optional[int]=480) -> Any:
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return
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