prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Update to Django 2.2
  - [ ] Check that all Django apps support 2.2
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `app/grandchallenge/serving/views.py`
  Content:
  ```
  1 import os
  2 import posixpath
  3 import re
  4 
  5 from django.conf import settings
  6 from django.core.files import File
  7 from django.core.files.storage import DefaultStorage
  8 from django.http import Http404, HttpResponse
  9 from django.shortcuts import get_object_or_404
  10 from django.utils._os import safe_join
  11 from rest_framework.authentication import TokenAuthentication
  12 from rest_framework.exceptions import AuthenticationFailed
  13 
  14 from grandchallenge.cases.models import Image
  15 from grandchallenge.challenges.models import Challenge
  16 from grandchallenge.core.storage import ProtectedS3Storage
  17 from grandchallenge.evaluation.models import Submission
  18 from grandchallenge.serving.api import serve_file
  19 from grandchallenge.serving.permissions import (
  20     can_access,
  21     user_can_download_image,
  22     user_can_download_submission,
  23 )
  24 
  25 
  26 def serve_fullpath(*, fullpath):
  27     storage = DefaultStorage()
  28 
  29     if not (os.path.abspath(fullpath) == fullpath) or not storage.exists(
  30         fullpath
  31     ):
  32         raise Http404("File not found.")
  33 
  34     try:
  35         f = storage.open(fullpath, "rb")
  36         file = File(f)
  37         return serve_file(file, save_as=True)
  38     except IOError:
  39         raise Http404("File not found.")
  40 
  41 
  42 def protected_storage_redirect(*, name):
  43     # Get the storage with the internal redirect and auth. This will prepend
  44     # settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url'] to the url
  45     storage = ProtectedS3Storage(internal=True)
  46 
  47     if not storage.exists(name=name):
  48         raise Http404("File not found.")
  49 
  50     url = storage.url(name=name)
  51 
  52     # Now strip the endpoint_url
  53     external_url = re.match(
  54         f"^{settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url']}(.*)$", url
  55     ).group(1)
  56 
  57     response = HttpResponse()
  58     response["X-Accel-Redirect"] = external_url
  59 
  60     return response
  61 
  62 
  63 def serve_folder(request, *, challenge_name=None, folder=None, path):
  64     """
  65     Serve static files in a folder.
  66 
  67     If the file is in a challenge folder, then the subfolders of this challenge
  68     will be checked for permissions, see `can_access`.
  69 
  70     If the challenge_short_name is not set, then the folder must be set.
  71     ALL FILES IN THIS FOLDER WILL BE AVAILABLE TO DOWNLOAD.
  72     """
  73     path = posixpath.normpath(path).lstrip("/")
  74 
  75     if challenge_name:
  76         if folder:
  77             raise AttributeError("Only challenge_name or folder should be set")
  78 
  79         challenge = get_object_or_404(
  80             Challenge, short_name__iexact=challenge_name
  81         )
  82 
  83         document_root = safe_join(settings.MEDIA_ROOT, challenge.short_name)
  84         fullpath = safe_join(document_root, path)
  85         allowed = can_access(
  86             request.user,
  87             fullpath[len(document_root) :].lstrip("/"),
  88             challenge=challenge,
  89         )
  90     elif folder:
  91         document_root = safe_join(settings.MEDIA_ROOT, folder)
  92         fullpath = safe_join(document_root, path)
  93         allowed = True
  94     else:
  95         raise AttributeError("challenge_name or folder must be set")
  96 
  97     if not allowed:
  98         raise Http404("File not found.")
  99 
  100     return serve_fullpath(fullpath=fullpath)
  101 
  102 
  103 def serve_images(request, *, pk, path):
  104     document_root = safe_join(f"/{settings.IMAGE_FILES_SUBDIRECTORY}", pk)
  105     path = posixpath.normpath(path).lstrip("/")
  106     name = safe_join(document_root, path)
  107 
  108     try:
  109         image = Image.objects.get(pk=pk)
  110     except Image.DoesNotExist:
  111         raise Http404("File not found.")
  112 
  113     try:
  114         user, _ = TokenAuthentication().authenticate(request)
  115     except (AuthenticationFailed, TypeError):
  116         user = request.user
  117 
  118     if user_can_download_image(user=user, image=image):
  119         return protected_storage_redirect(name=name)
  120 
  121     raise Http404("File not found.")
  122 
  123 
  124 def serve_submissions(request, *, submission_pk, **_):
  125     try:
  126         submission = Submission.objects.get(pk=submission_pk)
  127     except Submission.DoesNotExist:
  128         raise Http404("File not found.")
  129 
  130     if user_can_download_submission(user=request.user, submission=submission):
  131         return protected_storage_redirect(name=submission.file.name)
  132 
  133     raise Http404("File not found.")
  134
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/app/grandchallenge/serving/views.py b/app/grandchallenge/serving/views.py
  --- a/app/grandchallenge/serving/views.py
  +++ b/app/grandchallenge/serving/views.py
  @@ -101,7 +101,7 @@
   
   
   def serve_images(request, *, pk, path):
  -    document_root = safe_join(f"/{settings.IMAGE_FILES_SUBDIRECTORY}", pk)
  +    document_root = safe_join(f"/{settings.IMAGE_FILES_SUBDIRECTORY}", str(pk))
       path = posixpath.normpath(path).lstrip("/")
       name = safe_join(document_root, path)
  
verification_info: {"golden_diff": "diff --git a/app/grandchallenge/serving/views.py b/app/grandchallenge/serving/views.py\n--- a/app/grandchallenge/serving/views.py\n+++ b/app/grandchallenge/serving/views.py\n@@ -101,7 +101,7 @@\n \n \n def serve_images(request, *, pk, path):\n-    document_root = safe_join(f\"/{settings.IMAGE_FILES_SUBDIRECTORY}\", pk)\n+    document_root = safe_join(f\"/{settings.IMAGE_FILES_SUBDIRECTORY}\", str(pk))\n     path = posixpath.normpath(path).lstrip(\"/\")\n     name = safe_join(document_root, path)\n", "issue": "Update to Django 2.2\n- [ ] Check that all Django apps support 2.2\n", "before_files": [{"content": "import os\nimport posixpath\nimport re\n\nfrom django.conf import settings\nfrom django.core.files import File\nfrom django.core.files.storage import DefaultStorage\nfrom django.http import Http404, HttpResponse\nfrom django.shortcuts import get_object_or_404\nfrom django.utils._os import safe_join\nfrom rest_framework.authentication import TokenAuthentication\nfrom rest_framework.exceptions import AuthenticationFailed\n\nfrom grandchallenge.cases.models import Image\nfrom grandchallenge.challenges.models import Challenge\nfrom grandchallenge.core.storage import ProtectedS3Storage\nfrom grandchallenge.evaluation.models import Submission\nfrom grandchallenge.serving.api import serve_file\nfrom grandchallenge.serving.permissions import (\n    can_access,\n    user_can_download_image,\n    user_can_download_submission,\n)\n\n\ndef serve_fullpath(*, fullpath):\n    storage = DefaultStorage()\n\n    if not (os.path.abspath(fullpath) == fullpath) or not storage.exists(\n        fullpath\n    ):\n        raise Http404(\"File not found.\")\n\n    try:\n        f = storage.open(fullpath, \"rb\")\n        file = File(f)\n        return serve_file(file, save_as=True)\n    except IOError:\n        raise Http404(\"File not found.\")\n\n\ndef protected_storage_redirect(*, name):\n    # Get the storage with the internal redirect and auth. This will prepend\n    # settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url'] to the url\n    storage = ProtectedS3Storage(internal=True)\n\n    if not storage.exists(name=name):\n        raise Http404(\"File not found.\")\n\n    url = storage.url(name=name)\n\n    # Now strip the endpoint_url\n    external_url = re.match(\n        f\"^{settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url']}(.*)$\", url\n    ).group(1)\n\n    response = HttpResponse()\n    response[\"X-Accel-Redirect\"] = external_url\n\n    return response\n\n\ndef serve_folder(request, *, challenge_name=None, folder=None, path):\n    \"\"\"\n    Serve static files in a folder.\n\n    If the file is in a challenge folder, then the subfolders of this challenge\n    will be checked for permissions, see `can_access`.\n\n    If the challenge_short_name is not set, then the folder must be set.\n    ALL FILES IN THIS FOLDER WILL BE AVAILABLE TO DOWNLOAD.\n    \"\"\"\n    path = posixpath.normpath(path).lstrip(\"/\")\n\n    if challenge_name:\n        if folder:\n            raise AttributeError(\"Only challenge_name or folder should be set\")\n\n        challenge = get_object_or_404(\n            Challenge, short_name__iexact=challenge_name\n        )\n\n        document_root = safe_join(settings.MEDIA_ROOT, challenge.short_name)\n        fullpath = safe_join(document_root, path)\n        allowed = can_access(\n            request.user,\n            fullpath[len(document_root) :].lstrip(\"/\"),\n            challenge=challenge,\n        )\n    elif folder:\n        document_root = safe_join(settings.MEDIA_ROOT, folder)\n        fullpath = safe_join(document_root, path)\n        allowed = True\n    else:\n        raise AttributeError(\"challenge_name or folder must be set\")\n\n    if not allowed:\n        raise Http404(\"File not found.\")\n\n    return serve_fullpath(fullpath=fullpath)\n\n\ndef serve_images(request, *, pk, path):\n    document_root = safe_join(f\"/{settings.IMAGE_FILES_SUBDIRECTORY}\", pk)\n    path = posixpath.normpath(path).lstrip(\"/\")\n    name = safe_join(document_root, path)\n\n    try:\n        image = Image.objects.get(pk=pk)\n    except Image.DoesNotExist:\n        raise Http404(\"File not found.\")\n\n    try:\n        user, _ = TokenAuthentication().authenticate(request)\n    except (AuthenticationFailed, TypeError):\n        user = request.user\n\n    if user_can_download_image(user=user, image=image):\n        return protected_storage_redirect(name=name)\n\n    raise Http404(\"File not found.\")\n\n\ndef serve_submissions(request, *, submission_pk, **_):\n    try:\n        submission = Submission.objects.get(pk=submission_pk)\n    except Submission.DoesNotExist:\n        raise Http404(\"File not found.\")\n\n    if user_can_download_submission(user=request.user, submission=submission):\n        return protected_storage_redirect(name=submission.file.name)\n\n    raise Http404(\"File not found.\")\n", "path": "app/grandchallenge/serving/views.py"}], "after_files": [{"content": "import os\nimport posixpath\nimport re\n\nfrom django.conf import settings\nfrom django.core.files import File\nfrom django.core.files.storage import DefaultStorage\nfrom django.http import Http404, HttpResponse\nfrom django.shortcuts import get_object_or_404\nfrom django.utils._os import safe_join\nfrom rest_framework.authentication import TokenAuthentication\nfrom rest_framework.exceptions import AuthenticationFailed\n\nfrom grandchallenge.cases.models import Image\nfrom grandchallenge.challenges.models import Challenge\nfrom grandchallenge.core.storage import ProtectedS3Storage\nfrom grandchallenge.evaluation.models import Submission\nfrom grandchallenge.serving.api import serve_file\nfrom grandchallenge.serving.permissions import (\n    can_access,\n    user_can_download_image,\n    user_can_download_submission,\n)\n\n\ndef serve_fullpath(*, fullpath):\n    storage = DefaultStorage()\n\n    if not (os.path.abspath(fullpath) == fullpath) or not storage.exists(\n        fullpath\n    ):\n        raise Http404(\"File not found.\")\n\n    try:\n        f = storage.open(fullpath, \"rb\")\n        file = File(f)\n        return serve_file(file, save_as=True)\n    except IOError:\n        raise Http404(\"File not found.\")\n\n\ndef protected_storage_redirect(*, name):\n    # Get the storage with the internal redirect and auth. This will prepend\n    # settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url'] to the url\n    storage = ProtectedS3Storage(internal=True)\n\n    if not storage.exists(name=name):\n        raise Http404(\"File not found.\")\n\n    url = storage.url(name=name)\n\n    # Now strip the endpoint_url\n    external_url = re.match(\n        f\"^{settings.PROTECTED_S3_STORAGE_KWARGS['endpoint_url']}(.*)$\", url\n    ).group(1)\n\n    response = HttpResponse()\n    response[\"X-Accel-Redirect\"] = external_url\n\n    return response\n\n\ndef serve_folder(request, *, challenge_name=None, folder=None, path):\n    \"\"\"\n    Serve static files in a folder.\n\n    If the file is in a challenge folder, then the subfolders of this challenge\n    will be checked for permissions, see `can_access`.\n\n    If the challenge_short_name is not set, then the folder must be set.\n    ALL FILES IN THIS FOLDER WILL BE AVAILABLE TO DOWNLOAD.\n    \"\"\"\n    path = posixpath.normpath(path).lstrip(\"/\")\n\n    if challenge_name:\n        if folder:\n            raise AttributeError(\"Only challenge_name or folder should be set\")\n\n        challenge = get_object_or_404(\n            Challenge, short_name__iexact=challenge_name\n        )\n\n        document_root = safe_join(settings.MEDIA_ROOT, challenge.short_name)\n        fullpath = safe_join(document_root, path)\n        allowed = can_access(\n            request.user,\n            fullpath[len(document_root) :].lstrip(\"/\"),\n            challenge=challenge,\n        )\n    elif folder:\n        document_root = safe_join(settings.MEDIA_ROOT, folder)\n        fullpath = safe_join(document_root, path)\n        allowed = True\n    else:\n        raise AttributeError(\"challenge_name or folder must be set\")\n\n    if not allowed:\n        raise Http404(\"File not found.\")\n\n    return serve_fullpath(fullpath=fullpath)\n\n\ndef serve_images(request, *, pk, path):\n    document_root = safe_join(f\"/{settings.IMAGE_FILES_SUBDIRECTORY}\", str(pk))\n    path = posixpath.normpath(path).lstrip(\"/\")\n    name = safe_join(document_root, path)\n\n    try:\n        image = Image.objects.get(pk=pk)\n    except Image.DoesNotExist:\n        raise Http404(\"File not found.\")\n\n    try:\n        user, _ = TokenAuthentication().authenticate(request)\n    except (AuthenticationFailed, TypeError):\n        user = request.user\n\n    if user_can_download_image(user=user, image=image):\n        return protected_storage_redirect(name=name)\n\n    raise Http404(\"File not found.\")\n\n\ndef serve_submissions(request, *, submission_pk, **_):\n    try:\n        submission = Submission.objects.get(pk=submission_pk)\n    except Submission.DoesNotExist:\n        raise Http404(\"File not found.\")\n\n    if user_can_download_submission(user=request.user, submission=submission):\n        return protected_storage_redirect(name=submission.file.name)\n\n    raise Http404(\"File not found.\")\n", "path": "app/grandchallenge/serving/views.py"}]}