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This endpoint serves requests which might originate from an image preview link which had an http url and the message holding the image link was rendered before we introduced thumbnailing. In that case we would have used a camo proxy to proxy http content over https and avoid mix content warnings. In near future, we plan to drop use of camo and just rely on thumbor to serve such images. This endpoint helps maintain backward compatibility for links which were already rendered.
79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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# See https://zulip.readthedocs.io/en/latest/subsystems/thumbnailing.html
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import base64
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import os
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import sys
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import urllib
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from django.conf import settings
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from libthumbor import CryptoURL
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ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath('__file__'))))
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sys.path.append(ZULIP_PATH)
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from zthumbor.loaders.helpers import (
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THUMBOR_S3_TYPE, THUMBOR_LOCAL_FILE_TYPE, THUMBOR_EXTERNAL_TYPE
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)
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from zerver.lib.camo import get_camo_url
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def is_thumbor_enabled() -> bool:
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return settings.THUMBOR_URL != ''
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def user_uploads_or_external(url: str) -> bool:
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return url.startswith('http') or url.lstrip('/').startswith('user_uploads/')
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def get_source_type(url: str) -> str:
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if not url.startswith('/user_uploads/'):
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return THUMBOR_EXTERNAL_TYPE
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local_uploads_dir = settings.LOCAL_UPLOADS_DIR
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if local_uploads_dir:
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return THUMBOR_LOCAL_FILE_TYPE
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return THUMBOR_S3_TYPE
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def generate_thumbnail_url(path: str,
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size: str='0x0',
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is_camo_url: bool=False) -> str:
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if not (path.startswith('https://') or path.startswith('http://')):
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path = '/' + path
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if not is_thumbor_enabled():
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if path.startswith('http://'):
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return get_camo_url(path)
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return path
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if not user_uploads_or_external(path):
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return path
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source_type = get_source_type(path)
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safe_url = base64.urlsafe_b64encode(path.encode()).decode('utf-8')
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image_url = '%s/source_type/%s' % (safe_url, source_type)
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width, height = map(int, size.split('x'))
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crypto = CryptoURL(key=settings.THUMBOR_KEY)
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smart_crop_enabled = True
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apply_filters = ['no_upscale()']
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if is_camo_url:
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smart_crop_enabled = False
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apply_filters.append('quality(100)')
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if size != '0x0':
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apply_filters.append('sharpen(0.5,0.2,true)')
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encrypted_url = crypto.generate(
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width=width,
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height=height,
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smart=smart_crop_enabled,
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filters=apply_filters,
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image_url=image_url
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)
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if settings.THUMBOR_URL == 'http://127.0.0.1:9995':
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# If THUMBOR_URL is the default then thumbor is hosted on same machine
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# as the Zulip server and we should serve a relative URL.
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# We add a /thumbor in front of the relative url because we make
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# use of a proxy pass to redirect request internally in Nginx to 9995
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# port where thumbor is running.
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thumbnail_url = '/thumbor' + encrypted_url
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else:
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thumbnail_url = urllib.parse.urljoin(settings.THUMBOR_URL, encrypted_url)
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return thumbnail_url
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