72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
import mimetypes
|
|
|
|
from django.conf import settings
|
|
from django.db import models as dbmodels
|
|
from PyPDF2 import PdfFileReader
|
|
from PyPDF2.utils import PdfReadError
|
|
|
|
from ..utils.rest_api import FileField, ModelSerializer, SerializerMethodField
|
|
from .models import Mediafile
|
|
|
|
|
|
class AngularCompatibleFileField(FileField):
|
|
def to_internal_value(self, data):
|
|
if data == "":
|
|
return None
|
|
return super(AngularCompatibleFileField, self).to_internal_value(data)
|
|
|
|
def to_representation(self, value):
|
|
if value is None:
|
|
return None
|
|
filetype = mimetypes.guess_type(value.path)[0]
|
|
result = {"name": value.name, "type": filetype}
|
|
if filetype == "application/pdf":
|
|
try:
|
|
result["pages"] = PdfFileReader(open(value.path, "rb")).getNumPages()
|
|
except FileNotFoundError:
|
|
# File was deleted from server. Set 'pages' to 0.
|
|
result["pages"] = 0
|
|
except PdfReadError:
|
|
# File could be encrypted but not be detected by PyPDF.
|
|
result["pages"] = 0
|
|
result["encrypted"] = True
|
|
return result
|
|
|
|
|
|
class MediafileSerializer(ModelSerializer):
|
|
"""
|
|
Serializer for mediafile.models.Mediafile objects.
|
|
"""
|
|
|
|
media_url_prefix = SerializerMethodField()
|
|
filesize = SerializerMethodField()
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
"""
|
|
This constructor overwrites the FileField field serializer to return the file meta data in a way that the
|
|
angualarjs upload module likes
|
|
"""
|
|
super(MediafileSerializer, self).__init__(*args, **kwargs)
|
|
self.serializer_field_mapping[dbmodels.FileField] = AngularCompatibleFileField
|
|
if self.instance is not None:
|
|
self.fields["mediafile"].read_only = True
|
|
|
|
class Meta:
|
|
model = Mediafile
|
|
fields = (
|
|
"id",
|
|
"title",
|
|
"mediafile",
|
|
"media_url_prefix",
|
|
"uploader",
|
|
"filesize",
|
|
"hidden",
|
|
"timestamp",
|
|
)
|
|
|
|
def get_filesize(self, mediafile):
|
|
return mediafile.get_filesize()
|
|
|
|
def get_media_url_prefix(self, mediafile):
|
|
return settings.MEDIA_URL
|