101 lines
2.5 KiB
Python
101 lines
2.5 KiB
Python
#!/usr/bin/env python3
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"""
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Some miscellaneous tools and helper functions. Primarily for quests.
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"""
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import os
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import re
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import json
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import hashlib
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import magic
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import requests
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from django.conf import settings
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from channels.layers import get_channel_layer
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from asgiref.sync import async_to_sync
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IMG_DIR = "/var/www/html/img/"
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ALLOWED_MIMES = [
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"image/jpeg",
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"image/png",
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"image/gif",
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"video/webm"
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]
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def download_img(url):
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"""
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Downloads the requested URL, ensures the mimetype is an acceptable
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type, and saves it to file with the hash as filename. Returns a
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URL to image.
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"""
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# TODO: file size limits
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# https://stackoverflow.com/questions/22346158/
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# TODO: prevent overwriting
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url = url.replace('..', '')
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if url.startswith(settings.IMG_SVR_URL):
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if '/' not in url.replace(settings.IMG_SVR_URL, ''):
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return url
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try:
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res = requests.get(url)
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res.raise_for_status()
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mime = magic.from_buffer(res.content, mime=True)
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assert mime in ALLOWED_MIMES
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h = hashlib.sha256()
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h.update(res.content)
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fname = h.hexdigest()
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fname += "." + mime.partition("/")[2]
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with open(os.path.join(IMG_DIR, fname), "wb") as file:
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for chunk in res.iter_content(100000):
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file.write(chunk)
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return settings.IMG_SVR_URL + fname
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except requests.exceptions.RequestException:
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return "INVALID_URL"
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except AssertionError:
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return "INVALID_MIME_TYPE"
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except Exception as e:
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print(e)
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return "UNKNOWN_ERROR"
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def handle_img(text, limit=5):
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"""
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Finds all image urls in the given set of text and attempts to handle
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them appropriately. `limit` will limit how many urls are processed.
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The rest will be ignored. If an error occurs during handling, the raw
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(unlinked) url will be inserted.
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"""
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# TODO: handle webms
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urls = re.findall(
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r"""\[img(?: title=['"](.*)['"])?\](.*)\[\/img\]""",
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text.replace('<br', '\n')
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)
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urls = urls[:limit]
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for match_pair in urls:
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title, ext_url = match_pair
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int_url = download_img(ext_url)
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if int_url in ["INVALID_URL", "INVALID_MIME_TYPE", "UNKNOWN_ERROR"]:
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text = re.sub(r"\[img.*?\[\/img\]", ext_url, text, 1)
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if not title:
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title = os.path.basename(ext_url)
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img_tag = f'<img src="{int_url}" title="{title}">'
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text = re.sub(r"\[img.*?\[\/img\]", img_tag, text, 1)
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return text
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def send_to_websocket(event, quest_id, data={}):
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"""
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Acts like QuestConsumer.send() but callable from views.
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"""
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channel_layer = get_channel_layer()
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group_name = f'quest_{quest_id}'
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data = json.dumps({'event': event, 'data': data})
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async_to_sync(channel_layer.group_send)(
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group_name,
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{
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'type': 'dispatch_send',
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'message': data
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}
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)
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