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45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
# See https://zulip.readthedocs.io/en/latest/subsystems/thumbnailing.html
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from typing import Optional
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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 ugettext as _
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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 UserProfile, validate_attachment_request
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def validate_thumbnail_request(user_profile: UserProfile, path: str) -> 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(user_profile, path_id)
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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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user_profile: UserProfile,
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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 validate_thumbnail_request(user_profile, url):
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return HttpResponseForbidden(_("<p>You are not authorized to view this file.</p>"))
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size = None
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if size_requested == "thumbnail":
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size = "0x300"
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elif size_requested == "full":
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size = "0x0"
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if size is None:
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return HttpResponseForbidden(_("<p>Invalid size.</p>"))
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thumbnail_url = generate_thumbnail_url(url, size)
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return redirect(thumbnail_url)
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