127 lines
3.9 KiB
Python
127 lines
3.9 KiB
Python
import datetime
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import uuid
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import shortuuid
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from django.db import models
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from django.contrib.auth.models import User
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from shortuuidfield import ShortUUIDField
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class File(models.Model):
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"""Store a file on the website.
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Deleting file after 1 day by default."""
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file = models.FileField(upload_to="files", default="")
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name = models.CharField(max_length=255, unique=True, null=True)
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author = models.ForeignKey(
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User, on_delete=models.CASCADE, null=True, related_name="file_author"
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)
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description = models.TextField(null=True)
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# No permission needed to read
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public = models.BooleanField(default=True)
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# To delete file after use to free memory
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expiration = models.DurationField(default=datetime.timedelta(days=1), null=True)
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# descriptor = models.FileDescriptor(null=True)
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path = models.FilePathField(null=True)
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created = models.DateTimeField(auto_now_add=True)
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written = models.DateTimeField(auto_now=True)
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read = models.DateTimeField(auto_now=True)
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read_count = models.PositiveIntegerField(default=0)
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write_count = models.PositiveIntegerField(default=0)
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def update_read(self):
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"""Update file when user reads."""
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self.read_count += 1
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self.read = datetime.datetime.now()
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def update_write(self):
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"""Update file when user reads."""
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self.write_count += 1
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self.written = datetime.datetime.now()
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# def
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class PermissionChoices(models.TextChoices):
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"""Permission type choices."""
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READ = "read" # right to read
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WRITE = "write" # right to write
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STAFF = "staff" # right to write meta data
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ADMIN = "admin" # rigth to add permissions
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class Permission(models.Model):
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"""User permission to access a file.
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Process:
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- Author of file create temporary access to permission
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- Permission available through public url (uuid based)
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- Connected user can click this url and get permission.
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- As soon as clicked the user is redirected to file.
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"""
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permission = models.CharField(max_length=255, choices=PermissionChoices.choices)
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file = models.ForeignKey(File, on_delete=models.CASCADE)
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user = models.ForeignKey(User, on_delete=models.CASCADE)
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created = models.DateTimeField(auto_now_add=True)
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revoked = models.DateTimeField(null=True)
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url_alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~"
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def get_uuid():
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return shortuuid.ShortUUID(alphabet=url_alphabet).random(6)
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class Access(models.Model):
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"""Temporary access to a file permission
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Available 1 hour by default.
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UUIDS are 6 characters long in a 66 characters long alphabet
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(all possible url characters not reserved)
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6 characters give 82653950016 possible access UUIDS ~= 10^12.
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Even with 6 characters the uuids is unguessable by modern computers.
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alphabet: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~"
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Default to one access count.
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"""
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id = ShortUUIDField(
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primary_key=True,
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editable=True,
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default=get_uuid,
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max_length=6,
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)
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file = models.ForeignKey(File, on_delete=models.CASCADE)
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permission = models.CharField(
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max_length=255,
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choices=PermissionChoices.choices,
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default=PermissionChoices.READ,
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)
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timestamp = models.DateTimeField(auto_now_add=True)
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expiration = models.DurationField(default=datetime.timedelta(hours=1), null=True)
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count = models.PositiveIntegerField(default=0)
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max_count = models.PositiveIntegerField(default=1)
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active = models.BooleanField(default=True)
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def update(self):
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"""Update counter when resources requested."""
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self.count += 1
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class Token(models.Model):
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"""Token for identifing user posting file."""
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id = models.UUIDField(primary_key=True, editable=False, default=uuid.uuid4)
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user = models.ForeignKey(User, on_delete=models.CASCADE, unique=False)
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created = models.DateTimeField(auto_now_add=True)
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