Models

SithFile

Bases: Model

clean()

Cleans up the file.

Source code in core/models.py

def clean(self):
    """Cleans up the file."""
    super().clean()
    if "/" in self.name:
        raise ValidationError(_("Character '/' not authorized in name"))
    if self == self.parent:
        raise ValidationError(_("Loop in folder tree"), code="loop")
    if self == self.parent or (
        self.parent is not None and self in self.get_parent_list()
    ):
        raise ValidationError(_("Loop in folder tree"), code="loop")
    if self.parent and self.parent.is_file:
        raise ValidationError(
            _("You can not make a file be a children of a non folder file")
        )
    if (
        self.parent is None
        and SithFile.objects.exclude(id=self.id)
        .filter(parent=None, name=self.name)
        .exists()
    ) or (
        self.parent
        and self.parent.children.exclude(id=self.id).filter(name=self.name).exists()
    ):
        raise ValidationError(_("Duplicate file"), code="duplicate")
    if self.is_folder:
        if self.file:
            try:
                import imghdr

                if imghdr.what(None, self.file.read()) not in [
                    "gif",
                    "png",
                    "jpeg",
                ]:
                    self.file.delete()
                    self.file = None
            except:  # noqa E722 I don't know the exception that can be raised
                self.file = None
        self.mime_type = "inode/directory"
    if self.is_file and (self.file is None or self.file == ""):
        raise ValidationError(_("You must provide a file"))

apply_rights_recursively(*, only_folders=False)

Apply the rights of this file to all children recursively.

Parameters:

Name	Type	Description	Default
only_folders	bool	If True, only apply the rights to SithFiles that are folders.	False

Source code in core/models.py

def apply_rights_recursively(self, *, only_folders: bool = False) -> None:
    """Apply the rights of this file to all children recursively.

    Args:
        only_folders: If True, only apply the rights to SithFiles that are folders.
    """
    file_ids = []
    explored_ids = [self.id]
    while len(explored_ids) > 0:  # find all children recursively
        file_ids.extend(explored_ids)
        next_level = SithFile.objects.filter(parent_id__in=explored_ids)
        if only_folders:
            next_level = next_level.filter(is_folder=True)
        explored_ids = list(next_level.values_list("id", flat=True))
    for through in (SithFile.view_groups.through, SithFile.edit_groups.through):
        # force evaluation. Without this, the iterator yields nothing
        groups = list(
            through.objects.filter(sithfile_id=self.id).values_list(
                "group_id", flat=True
            )
        )
        # delete previous rights
        through.objects.filter(sithfile_id__in=file_ids).delete()
        through.objects.bulk_create(  # create new rights
            [through(sithfile_id=f, group_id=g) for f in file_ids for g in groups]
        )

copy_rights()

Copy, if possible, the rights of the parent folder.

Source code in core/models.py

def copy_rights(self):
    """Copy, if possible, the rights of the parent folder."""
    if self.parent is not None:
        self.edit_groups.set(self.parent.edit_groups.all())
        self.view_groups.set(self.parent.view_groups.all())

move_to(parent)

Move a file to a new parent. parent must be a SithFile with the is_folder=True property. Otherwise, this function doesn't change anything. This is done only at the DB level, so that it's very fast for the user. Indeed, this function doesn't modify SithFiles recursively, so it stays efficient even with top-level folders.

Source code in core/models.py

def move_to(self, parent):
    """Move a file to a new parent.
    `parent` must be a SithFile with the `is_folder=True` property. Otherwise, this function doesn't change
    anything.
    This is done only at the DB level, so that it's very fast for the user. Indeed, this function doesn't modify
    SithFiles recursively, so it stays efficient even with top-level folders.
    """
    if not parent.is_folder:
        return
    self.parent = parent
    self.clean()
    self.save()

User

Bases: AbstractBaseUser

Defines the base user class, useable in every app.

This is almost the same as the auth module AbstractUser since it inherits from it, but some fields are required, and the username is generated automatically with the name of the user (see generate_username()).

Added field: nick_name, date_of_birth Required fields: email, first_name, last_name, date_of_birth

cached_groups: list[Group] property

Get the list of groups this user is in.

The result is cached for the default duration (should be 5 minutes)

Returns: A list of all the groups this user is in.

is_in_group(*, pk=None, name=None)

Check if this user is in the given group. Either a group id or a group name must be provided. If both are passed, only the id will be considered.

The group will be fetched using the given parameter. If no group is found, return False. If a group is found, check if this user is in the latter.

Returns:

Type	Description
bool	True if the user is the group, else False

Source code in core/models.py

def is_in_group(self, *, pk: int | None = None, name: str | None = None) -> bool:
    """Check if this user is in the given group.
    Either a group id or a group name must be provided.
    If both are passed, only the id will be considered.

    The group will be fetched using the given parameter.
    If no group is found, return False.
    If a group is found, check if this user is in the latter.

    Returns:
         True if the user is the group, else False
    """
    if pk is not None:
        group: Optional[Group] = get_group(pk=pk)
    elif name is not None:
        group: Optional[Group] = get_group(name=name)
    else:
        raise ValueError("You must either provide the id or the name of the group")
    if group is None:
        return False
    if group.id == settings.SITH_GROUP_PUBLIC_ID:
        return True
    if group.id == settings.SITH_GROUP_SUBSCRIBERS_ID:
        return self.is_subscribed
    if group.id == settings.SITH_GROUP_OLD_SUBSCRIBERS_ID:
        return self.was_subscribed
    if group.id == settings.SITH_GROUP_ROOT_ID:
        return self.is_root
    if group.is_meta:
        # check if this group is associated with a club
        group.__class__ = MetaGroup
        club = group.associated_club
        if club is None:
            return False
        membership = club.get_membership_for(self)
        if membership is None:
            return False
        if group.name.endswith(settings.SITH_MEMBER_SUFFIX):
            return True
        return membership.role > settings.SITH_MAXIMUM_FREE_ROLE
    return group in self.cached_groups

age()

Return the age this user has the day the method is called. If the user has not filled his age, return 0.

Source code in core/models.py

@cached_property
def age(self) -> int:
    """Return the age this user has the day the method is called.
    If the user has not filled his age, return 0.
    """
    if self.date_of_birth is None:
        return 0
    today = timezone.now()
    age = today.year - self.date_of_birth.year
    # remove a year if this year's birthday is yet to come
    age -= (today.month, today.day) < (
        self.date_of_birth.month,
        self.date_of_birth.day,
    )
    return age

get_full_name()

Returns the first_name plus the last_name, with a space in between.

Source code in core/models.py

def get_full_name(self):
    """Returns the first_name plus the last_name, with a space in between."""
    full_name = "%s %s" % (self.first_name, self.last_name)
    return full_name.strip()

get_short_name()

Returns the short name for the user.

Source code in core/models.py

def get_short_name(self):
    """Returns the short name for the user."""
    if self.nick_name:
        return self.nick_name
    return self.first_name + " " + self.last_name

get_display_name()

Returns the display name of the user.

A nickname if possible, otherwise, the full name.

Source code in core/models.py

def get_display_name(self) -> str:
    """Returns the display name of the user.

    A nickname if possible, otherwise, the full name.
    """
    if self.nick_name:
        return "%s (%s)" % (self.get_full_name(), self.nick_name)
    return self.get_full_name()

get_age()

Returns the age.

Source code in core/models.py

def get_age(self):
    """Returns the age."""
    today = timezone.now()
    born = self.date_of_birth
    return (
        today.year - born.year - ((today.month, today.day) < (born.month, born.day))
    )

get_family(godfathers_depth=4, godchildren_depth=4)

Get the family of the user, with the given depth.

Parameters:

Name	Type	Description	Default
godfathers_depth	NonNegativeInt	The number of generations of godfathers to fetch	4
godchildren_depth	NonNegativeInt	The number of generations of godchildren to fetch	4

Returns:

Type	Description
set[through]	A list of family relationships in this user's family

Source code in core/models.py

def get_family(
    self,
    godfathers_depth: NonNegativeInt = 4,
    godchildren_depth: NonNegativeInt = 4,
) -> set[User.godfathers.through]:
    """Get the family of the user, with the given depth.

    Args:
        godfathers_depth: The number of generations of godfathers to fetch
        godchildren_depth: The number of generations of godchildren to fetch

    Returns:
        A list of family relationships in this user's family
    """
    res = []
    for depth, key, reverse_key in [
        (godfathers_depth, "from_user_id", "to_user_id"),
        (godchildren_depth, "to_user_id", "from_user_id"),
    ]:
        if depth == 0:
            continue
        links = list(User.godfathers.through.objects.filter(**{key: self.id}))
        res.extend(links)
        for _ in range(1, depth):  # noqa: F402 we don't care about gettext here
            ids = [getattr(c, reverse_key) for c in links]
            links = list(
                User.godfathers.through.objects.filter(
                    **{f"{key}__in": ids}
                ).exclude(id__in=[r.id for r in res])
            )
            if not links:
                break
            res.extend(links)
    return set(res)

email_user(subject, message, from_email=None, **kwargs)

Sends an email to this User.

Source code in core/models.py

def email_user(self, subject, message, from_email=None, **kwargs):
    """Sends an email to this User."""
    if from_email is None:
        from_email = settings.DEFAULT_FROM_EMAIL
    send_mail(subject, message, from_email, [self.email], **kwargs)

generate_username()

Generates a unique username based on the first and last names.

For example: Guy Carlier gives gcarlier, and gcarlier1 if the first one exists.

Returns:

Type	Description
str	The generated username.

Source code in core/models.py

def generate_username(self) -> str:
    """Generates a unique username based on the first and last names.

    For example: Guy Carlier gives gcarlier, and gcarlier1 if the first one exists.

    Returns:
        The generated username.
    """

    def remove_accents(data):
        return "".join(
            x
            for x in unicodedata.normalize("NFKD", data)
            if unicodedata.category(x)[0] == "L"
        ).lower()

    user_name = (
        remove_accents(self.first_name[0] + self.last_name)
        .encode("ascii", "ignore")
        .decode("utf-8")
    )
    un_set = [u.username for u in User.objects.all()]
    if user_name in un_set:
        i = 1
        while user_name + str(i) in un_set:
            i += 1
        user_name += str(i)
    self.username = user_name
    return user_name

is_owner(obj)

Determine if the object is owned by the user.

Source code in core/models.py

def is_owner(self, obj):
    """Determine if the object is owned by the user."""
    if hasattr(obj, "is_owned_by") and obj.is_owned_by(self):
        return True
    if hasattr(obj, "owner_group") and self.is_in_group(pk=obj.owner_group.id):
        return True
    return self.is_root

can_edit(obj)

Determine if the object can be edited by the user.

Source code in core/models.py

def can_edit(self, obj):
    """Determine if the object can be edited by the user."""
    if hasattr(obj, "can_be_edited_by") and obj.can_be_edited_by(self):
        return True
    if hasattr(obj, "edit_groups"):
        for pk in obj.edit_groups.values_list("pk", flat=True):
            if self.is_in_group(pk=pk):
                return True
    if isinstance(obj, User) and obj == self:
        return True
    return self.is_owner(obj)

can_view(obj)

Determine if the object can be viewed by the user.

Source code in core/models.py

def can_view(self, obj):
    """Determine if the object can be viewed by the user."""
    if hasattr(obj, "can_be_viewed_by") and obj.can_be_viewed_by(self):
        return True
    if hasattr(obj, "view_groups"):
        for pk in obj.view_groups.values_list("pk", flat=True):
            if self.is_in_group(pk=pk):
                return True
    return self.can_edit(obj)

clubs_with_rights()

The list of clubs where the user has rights

Source code in core/models.py

@cached_property
def clubs_with_rights(self) -> list[Club]:
    """The list of clubs where the user has rights"""
    memberships = self.memberships.ongoing().board().select_related("club")
    return [m.club for m in memberships]

SasFile

Bases: SithFile

Proxy model for any file in the SAS.

May be used to have logic that should be shared by both Picture and Album.

PictureQuerySet

Bases: QuerySet

viewable_by(user)

Filter the pictures that this user can view.

Warning

Calling this queryset method may add several additional requests.

Source code in sas/models.py

def viewable_by(self, user: User) -> Self:
    """Filter the pictures that this user can view.

    Warning:
        Calling this queryset method may add several additional requests.
    """
    if user.is_root or user.is_in_group(pk=settings.SITH_GROUP_SAS_ADMIN_ID):
        return self.all()
    if user.was_subscribed:
        return self.filter(is_moderated=True)
    return self.filter(people__user_id=user.id, is_moderated=True)

SASPictureManager

Bases: Manager

Picture

Bases: SasFile

AlbumQuerySet

Bases: QuerySet

viewable_by(user)

Filter the albums that this user can view.

Warning

Calling this queryset method may add several additional requests.

Source code in sas/models.py

def viewable_by(self, user: User) -> Self:
    """Filter the albums that this user can view.

    Warning:
        Calling this queryset method may add several additional requests.
    """
    if user.is_root or user.is_in_group(pk=settings.SITH_GROUP_SAS_ADMIN_ID):
        return self.all()
    if user.was_subscribed:
        return self.filter(is_moderated=True)
    # known bug : if all children of an album are also albums
    # then this album is excluded, even if one of the sub-albums should be visible.
    # The fs-like navigation is likely to be half-broken for non-subscribers,
    # but that's ok, since non-subscribers are expected to see only the albums
    # containing pictures on which they have been identified (hence, very few).
    # Most, if not all, of their albums will be displayed on the
    # `latest albums` section of the SAS.
    # Moreover, they will still see all of their picture in their profile.
    return self.filter(
        Exists(Picture.objects.filter(parent_id=OuterRef("pk")).viewable_by(user))
    )

SASAlbumManager

Bases: Manager

Album

Bases: SasFile

NAME_MAX_LENGTH: int = 50 class-attribute

Maximum length of an album's name.

SithFile have a maximum length of 256 characters. However, this limit is too high for albums. Names longer than 50 characters are harder to read and harder to display on the SAS page.

It is to be noted, though, that this does not add or modify any db behaviour. It's just a constant to be used in views and forms.

PeoplePictureRelation

Bases: Model

The PeoplePictureRelation class makes the connection between User and Picture.

PictureModerationRequest

Bases: Model

A request to remove a Picture from the SAS.

exif_auto_rotate(image)

Source code in core/utils.py

def exif_auto_rotate(image):
    for orientation in ExifTags.TAGS:
        if ExifTags.TAGS[orientation] == "Orientation":
            break
    exif = dict(image._getexif().items())

    if exif[orientation] == 3:
        image = image.rotate(180, expand=True)
    elif exif[orientation] == 6:
        image = image.rotate(270, expand=True)
    elif exif[orientation] == 8:
        image = image.rotate(90, expand=True)

    return image

resize_image(im, edge, img_format, *, optimize=True)

Resize an image to fit the given edge length and format.

Parameters:

Name	Type	Description	Default
im	Image	the image to resize	required
edge	int	the length that the greater side of the resized image should have	required
img_format	str	the target format of the image ("JPEG", "PNG", "WEBP"...)	required
optimize	bool	Should the resized image be optimized ?	True

Source code in core/utils.py

def resize_image(
    im: Image, edge: int, img_format: str, *, optimize: bool = True
) -> ContentFile:
    """Resize an image to fit the given edge length and format.

    Args:
        im: the image to resize
        edge: the length that the greater side of the resized image should have
        img_format: the target format of the image ("JPEG", "PNG", "WEBP"...)
        optimize: Should the resized image be optimized ?
    """
    (w, h) = im.size
    ratio = edge / max(w, h)
    (width, height) = int(w * ratio), int(h * ratio)
    return resize_image_explicit(im, (width, height), img_format, optimize=optimize)

sas_notification_callback(notif)

Source code in sas/models.py

def sas_notification_callback(notif):
    count = Picture.objects.filter(is_moderated=False).count()
    if count:
        notif.viewed = False
    else:
        notif.viewed = True
    notif.param = "%s" % count
    notif.date = timezone.now()