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64 lines
2.2 KiB
Python
64 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
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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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def cache_key_func(url: str) -> str:
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return url
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@cache_with_key(cache_key_func, 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[Any, 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(cache_key_func, 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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