mirror of https://github.com/zulip/zulip.git
48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
from typing import Optional, Union
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from django.contrib.auth.models import AnonymousUser
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from django.http import HttpRequest, HttpResponse, HttpResponseForbidden
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from django.shortcuts import redirect
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from django.utils.translation import gettext as _
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from zerver.context_processors import get_valid_realm_from_request
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from zerver.lib.attachments import validate_attachment_request
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from zerver.lib.request import REQ, has_request_variables
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from zerver.lib.thumbnail import generate_thumbnail_url
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from zerver.models import Realm, UserProfile
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def validate_thumbnail_request(
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realm: Realm,
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maybe_user_profile: Union[UserProfile, AnonymousUser],
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path: str,
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) -> Optional[bool]:
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# path here does not have a leading / as it is parsed from request hitting the
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# thumbnail endpoint (defined in urls.py) that way.
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if path.startswith("user_uploads/"):
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path_id = path[len("user_uploads/") :]
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return validate_attachment_request(maybe_user_profile, path_id, realm)
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# This is an external link and we don't enforce restricted view policy here.
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return True
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@has_request_variables
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def backend_serve_thumbnail(
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request: HttpRequest,
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maybe_user_profile: Union[UserProfile, AnonymousUser],
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url: str = REQ(),
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size_requested: str = REQ("size"),
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) -> HttpResponse:
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if not maybe_user_profile.is_authenticated:
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realm = get_valid_realm_from_request(request)
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else:
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assert isinstance(maybe_user_profile, UserProfile)
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realm = maybe_user_profile.realm
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if not validate_thumbnail_request(realm, maybe_user_profile, url):
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return HttpResponseForbidden(_("<p>You are not authorized to view this file.</p>"))
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thumbnail_url = generate_thumbnail_url(url)
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return redirect(thumbnail_url)
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