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# passerelle - uniform access to multiple data sources and services
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# Copyright (C) 2022 Entr'ouvert
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from django import forms
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class BinaryFileInput(forms.ClearableFileInput):
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def is_initial(self, value):
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"""
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Return whether value is considered to be initial value.
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"""
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return bool(value)
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def format_value(self, value):
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"""Format the size of the value in the db.
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We can't render it's name or url, but we'd like to give some information
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as to wether this file is not empty/corrupt.
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"""
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if self.is_initial(value):
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return f'{len(value)} bytes'
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def value_from_datadict(self, data, files, name):
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"""Return the file contents so they can be put in the db."""
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upload = super().value_from_datadict(data, files, name)
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if upload:
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return upload.read()
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return upload
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class BinaryFileField(forms.FileField):
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widget = BinaryFileInput
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def __init__(self, *, max_length=None, **kwargs):
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self.max_length = max_length
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super().__init__(**kwargs)
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def to_python(self, data):
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return data
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def clean(self, data, initial=None):
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# False means the field value should be cleared; further validation is
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# not needed.
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if data is False:
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if not self.required:
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return None
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# If the field is required, clearing is not possible (the widget
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# shouldn't return False data in that case anyway). False is not
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# in self.empty_value; if a False value makes it this far
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# it should be validated from here on out as None (so it will be
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# caught by the required check).
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data = None
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if not data and initial:
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return initial
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return super(forms.FileField, self).clean(data)
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def bound_data(self, data, initial):
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if data is None:
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return initial
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return data
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def has_changed(self, initial, data):
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return not self.disabled and data is not None
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