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import zipfile
from zipfile import BadZipFile
import logging
import datetime
import time
import os
from io import BytesIO
from fractions import Fraction
try:
import Image
except ImportError:
from PIL import Image
from django import forms
from django.utils.translation import ugettext_lazy as _
from django.contrib import messages
from django.contrib.sites.models import Site
from django.conf import settings
from django.utils.encoding import force_text
from django.template.defaultfilters import slugify
from django.core.files.base import ContentFile
from django.contrib.admin import widgets
from django.contrib.gis.geos import Point
import exiftool
from photos.models import LuxImage, Gallery
from locations.models import Location
logger = logging.getLogger('photos.forms')
class UploadZipForm(forms.Form):
"""
Handles the uploading of a gallery of photos packed in a .zip file
Creates Gallery object, adds photos with all metadata that's available
"""
zip_file = forms.FileField()
title = forms.CharField(label=_('Gallery Title'), max_length=250)
slug = forms.SlugField(label=_('Gallery Slug'))
desc = forms.CharField(label=_('Gallery Caption'), widget=forms.Textarea, required=False)
date = forms.SplitDateTimeField(label=_('Date'), widget=widgets.AdminSplitDateTime)
is_public = forms.BooleanField(label=_('Is public'), initial=True, required=False, help_text=_('Show on site'))
def clean_zip_file(self):
"""Open the zip file a first time, to check that it is a valid zip archive.
We'll open it again in a moment, so we have some duplication, but let's focus
on keeping the code easier to read!
"""
zip_file = self.cleaned_data['zip_file']
try:
zip = zipfile.ZipFile(zip_file)
except BadZipFile as e:
raise forms.ValidationError(str(e))
bad_file = zip.testzip()
if bad_file:
zip.close()
raise forms.ValidationError('"%s" in the .zip archive is corrupt.' % bad_file)
zip.close() # Close file in all cases.
return zip_file
def clean_title(self):
title = self.cleaned_data['title']
if title and Gallery.objects.filter(title=title).exists():
raise forms.ValidationError(_('A gallery with that title already exists.'))
return title
def clean(self):
cleaned_data = super(UploadZipForm, self).clean()
if not self['title'].errors:
# If there's already an error in the title, no need to add another
# error related to the same field.
if not cleaned_data.get('title', None) and not cleaned_data['gallery']:
raise forms.ValidationError(
_('Select an existing gallery, or enter a title for a new gallery.'))
return cleaned_data
def save(self, request=None, zip_file=None):
if not zip_file:
zip_file = self.cleaned_data['zip_file']
gallery, created = Gallery.objects.get_or_create(
title= self.cleaned_data['title'],
description = self.cleaned_data['desc'],
slug= self.cleaned_data['slug'],
pub_date= self.cleaned_data['date']
)
zipper = zipfile.ZipFile(zip_file)
count = 1
for filename in sorted(zipper.namelist()):
f, file_extension = os.path.splitext(filename)
logger.debug('Reading file "{0}".'.format(filename))
if filename.startswith('__') or filename.startswith('.'):
logger.debug('Ignoring file "{0}".'.format(filename))
continue
if os.path.dirname(filename):
logger.warning('Ignoring file "{0}" as it is in a subfolder; all images should be in the top '
'folder of the zip.'.format(filename))
if request:
messages.warning(request,
_('Ignoring file "{filename}" as it is in a subfolder').format(filename=filename), fail_silently=True)
continue
data = zipper.read(filename)
if not len(data):
logger.debug('File "{0}" is empty.'.format(filename))
continue
# Basic check that we have a valid image.
try:
file = BytesIO(data)
opened = Image.open(file)
opened.verify()
except Exception:
# Pillow (or PIL) doesn't recognize it as an image.
# If a "bad" file is found we just skip it.
# But we do flag this both in the logs and to the user.
logger.error('Could not process file "{0}" in the .zip archive.'.format(
filename))
if request:
messages.warning(request,
_('Could not process file "{0}" in the .zip archive.').format(
filename),
fail_silently=True)
continue
image = LuxImage(
pub_date = datetime.datetime.now()
)
contentfile = ContentFile(data)
image.image.save(filename, contentfile)
image.save()
gallery.image.add(image)
with exiftool.ExifTool() as et:
meta = et.get_metadata(image.image.path)
et.terminate()
image.exif_raw = meta
try:
image.title = meta["EXIF:ImageDescription"]
except:
pass
try:
image.caption = meta["EXIF:UserComment"]
except:
pass
try:
image.exif_lens = meta["MakerNotes:LensType"]
except:
pass
try:
image.point = Point(meta["XMP:GPSLongitude"], meta["XMP:GPSLatitude"], srid=4326)
try:
image.location = Location.objects.filter(geometry__contains=image.point).get()
except Location.DoesNotExist:
pass
except KeyError:
pass
image.exif_aperture = meta["EXIF:FNumber"]
image.exif_make = meta["EXIF:Make"]
image.exif_model = meta["EXIF:Model"]
image.exif_exposure = str(Fraction(float(meta["EXIF:ExposureTime"])).limit_denominator())
image.exif_iso = meta["EXIF:ISO"]
image.exif_focal_length = meta["EXIF:FocalLength"]
fmt_date = time.strptime(meta["EXIF:DateTimeOriginal"], "%Y:%m:%d %H:%M:%S")
image.exif_date = time.strftime("%Y-%m-%d %H:%M:%S", fmt_date)
image.height = meta["File:ImageHeight"]
image.width = meta["File:ImageWidth"]
image.save()
count += 1
zipper.close()
if request:
messages.success(request, _('The photos have been uploaded'))
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