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from collections import namedtuple
from datetime import datetime
import logging
import os
import urllib.parse
from bottle import abort, default_app, response, route, run, template
from feedgen.feed import FeedGenerator
import icalendar as ical
from justhtml import JustHTML
from markdown import markdown
import requests
Group = namedtuple("Group", "name url description events")
Event = namedtuple("Event", "url title description start_time end_time venue")
Venue = namedtuple("Venue", "name address city state country")
class GroupNotFoundException(Exception):
pass
app = default_app()
if os.getenv("MEETFREE_BASE_URL"):
app.config["base_url"] = os.getenv("MEETFREE_BASE_URL")
else:
logging.warning("MEETFREE_BASE_URL environment variable unset; "
"Atom feed will not have \"self\" URL.")
if os.getenv("MEETFREE_ALLOWED_GROUPS"):
app.config["allowed_groups"] = set(
os.getenv("MEETFREE_ALLOWED_GROUPS").split())
def graphql_query(endpoint, query, **variables):
response = requests.post(endpoint,
json={"query": query,
"variables": variables},
headers={"Content-Type": "application/json"})
response.raise_for_status()
json_response = response.json()
if ("errors" not in json_response) or (not "errors" in json_response):
return json_response["data"]
else:
raise Exception(json_response["errors"])
def meetup_group(group_slug):
def edge2event(edge):
match edge:
case {
"node": {
"eventUrl": url,
"title": title,
"description": description,
"dateTime": start_time,
"endTime": end_time,
"venue": {
"name": venue_name,
"address": venue_address,
"city": venue_city,
"state": venue_state,
"country": venue_country
}
}
}:
return Event(url,
title,
description,
datetime.fromisoformat(start_time),
datetime.fromisoformat(end_time),
Venue(venue_name,
venue_address,
venue_city,
venue_state,
venue_country))
match graphql_query(
"https://www.meetup.com/gql2",
"""
query ($urlname: String!) {
groupByUrlname(urlname: $urlname) {
name
link
description
events(status: ACTIVE, first: 5) {
edges {
node {
title
description
dateTime
endTime
eventUrl
venue {
name
address
city
state
country
}
}
}
}
}
}
""",
urlname=group_slug)["groupByUrlname"]:
case {
"name": name,
"link": url,
"description": description,
"events": {
"edges": edges
}
}:
return Group(name,
url,
description,
[edge2event(edge) for edge in edges])
case _:
raise GroupNotFoundException(group_slug)
def is_blank(string):
return not string.strip()
def venue2location(venue):
return ", ".join(
part
for part in [venue.name, venue.address, venue.city,
venue.state, venue.country]
if not is_blank(part))
def human_date(dt):
return dt.strftime("%A, %B %-d, %Y at %-I:%M %p")
def group2atom(group, feed_self_url):
feed = FeedGenerator()
feed.id(group.url)
feed.title(group.name)
feed.link(href=group.url, rel="alternate")
if feed_self_url:
feed.link(href=feed_self_url, rel="self")
for event in group.events:
entry = feed.add_entry()
entry.id(event.url)
entry.title(event.title)
entry.description(f"""
Where: {venue2location(event.venue)}
When: {human_date(event.start_time)}
{event.description}
""")
entry.link(href=event.url)
return feed
def group2ical(group):
return ical.Calendar.new(
name=group.name,
description=group.description,
subcomponents=[
ical.Event.new(
summary=event.title,
description=event.description,
start=event.start_time,
end=event.end_time,
location=venue2location(event.venue)
)
for event in group.events
]
)
def group2html(group):
return template("""
% from datetime import datetime
<!DOCTYPE html>
<html>
<head>
<title>{{group_name}}</title>
</head>
<body>
<header>
<h1>{{group_name}}</h1>
{{!group_description}}
</header>
<main>
<h2>Upcoming Events</h2>
% if events:
<dl>
% for event in events:
<dt><a href="{{event.url}}">{{event.title}}</a></dt>
<dd>
<time datetime="{{datetime.isoformat(event.start_time)}}">
{{human_date(event.start_time)}}
</time>
</dd>
% end
</dl>
% else:
<p>No upcoming events</p>
% end
</main>
</body>
</html>
""",
group_name = group.name,
group_description = markdown(
JustHTML(group.description, fragment=True).to_html()),
events = group.events,
human_date = human_date)
def meetup_group_or_404(slug):
try:
if "allowed_groups" in app.config and slug not in app.config["allowed_groups"]:
raise GroupNotFoundException(slug)
group = meetup_group(slug)
except GroupNotFoundException:
abort(404, "Group not found")
return group
@route("/<slug>.atom")
def atom(slug):
response.content_type = "application/atom+xml"
return (group2atom(
meetup_group_or_404(slug),
urllib.parse.urljoin(app.config["base_url"], f"/{slug}.atom")
if "base_url" in app.config else None)
.atom_str(pretty=True))
@route("/<slug>.ics")
def ics(slug):
response.content_type = "text/calendar"
return group2ical(meetup_group_or_404(slug)).to_ical()
@route("/<slug>")
def html(slug):
return group2html(meetup_group_or_404(slug))
if __name__ == "__main__":
run(host="localhost", port=8080, debug=True)
|
