[Files] Error when uploading PDF files + preview

[delmaass]

The backend raises an internal error when trying to upload a PDF file.

Internal Server Error: /api/v1/associations/media/
Traceback (most recent call last):
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\pdf2image\pdf2image.py", line 420, in pdfinfo_from_path
    proc = Popen(command, env=env, stdout=PIPE, stderr=PIPE)
  File "C:\Users\louis\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 800, in __init__
    restore_signals, start_new_session)
  File "C:\Users\louis\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 1207, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] Le fichier spécifié est introuvable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\viewsets.py", line 114, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\views.py", line 505, in dispatch
    response = self.handle_exception(exc)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\views.py", line 465, in handle_exception
    self.raise_uncaught_exception(exc)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\views.py", line 476, in raise_uncaught_exception
    raise exc
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\views.py", line 502, in dispatch
    response = handler(request, *args, **kwargs)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\mixins.py", line 19, in create
    self.perform_create(serializer)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\associations\views\media.py", line 46, in perform_create
    file=self.request.data["file"],
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\serializers.py", line 212, in save
    self.instance = self.create(validated_data)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\rest_framework\serializers.py", line 948, in create
    instance = ModelClass._default_manager.create(**validated_data)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\db\models\query.py", line 422, in create
    obj.save(force_insert=True, using=self.db)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\db\models\base.py", line 744, in save
    force_update=force_update, update_fields=update_fields)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\db\models\base.py", line 793, in save_base
    update_fields=update_fields, raw=raw, using=using,
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\dispatch\dispatcher.py", line 175, in send
    for receiver in self._live_receivers(sender)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\django\dispatch\dispatcher.py", line 175, in <listcomp>
    for receiver in self._live_receivers(sender)
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\associations\models\media.py", line 104, in create_preview
    image = convert_from_path(instance.file.path, last_page=1)[0]
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\pdf2image\pdf2image.py", line 94, in convert_from_path
    page_count = pdfinfo_from_path(pdf_path, userpw, poppler_path=poppler_path)["Pages"]       
  File "C:\Users\louis\Desktop\Portail-des-eleves\backend\venv\lib\site-packages\pdf2image\pdf2image.py", line 442, in pdfinfo_from_path
    "Unable to get page count. Is poppler installed and in PATH?"
pdf2image.exceptions.PDFInfoNotInstalledError: Unable to get page count. Is poppler installed and in PATH?
[05/Apr/2022 21:46:31] "POST /api/v1/associations/media/ HTTP/1.1" 500 29572

However, it seems that the file is correctly uploaded.

No preview is available but we can nevertheless download the file (good point).

The internal error should be fixed and a PDF display added.

[delmaass]

This preview issue for PDF files also happens in the canvas on the homepage when publishing a new file