Self-hostable uptime monitor and status page on Django: HTTP checks, Lighthouse audits, SEO crawls, and email and Discord alerts.
djangodockerhandcodedpythonself-hostedsqlitestatus-pageuptime-monitoringvite
1"""
2Template tags for social media and sharing in general.
3"""
4import hashlib
5import io
6import threading
7
8from django import template
9from django.core.files.storage import default_storage
10from django.utils.html import format_html
11from django.utils import timezone
12
13from status.chromium import generate_screenshot_from_url
14
15register = template.Library()
16
17
18@register.simple_tag
19def og_image(url):
20 filename = hashlib.md5(url.encode("utf-8")).hexdigest()
21 filename = f"opengraph/{filename}.png"
22
23 if not default_storage.exists(filename):
24 # save a quick file to prevent infinite loop
25 default_storage.save(filename, io.BytesIO())
26 generate_screenshot_from_url(url, filename)
27 else:
28 # if the file exists, check it's timestamp, if it's older than a day
29 # regenerate it with threading since the old one is okay for now
30 one_day_ago = timezone.now() - timezone.timedelta(days=1)
31 if default_storage.get_modified_time(filename) < one_day_ago:
32 threading.Thread(
33 target=generate_screenshot_from_url, args=(url, filename)
34 ).start()
35
36 # get full url including domain
37 url = default_storage.url(filename)
38 return format_html('<meta property="og:image" content="{}">', url)