mirror of
https://github.com/ae-utbm/sith3.git
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147 lines
4.5 KiB
Python
147 lines
4.5 KiB
Python
#
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# Copyright 2023 © AE UTBM
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# ae@utbm.fr / ae.info@utbm.fr
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#
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# This file is part of the website of the UTBM Student Association (AE UTBM),
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# https://ae.utbm.fr.
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#
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# You can find the source code of the website at https://github.com/ae-utbm/sith3
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#
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# LICENSED UNDER THE GNU GENERAL PUBLIC LICENSE VERSION 3 (GPLv3)
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# SEE : https://raw.githubusercontent.com/ae-utbm/sith3/master/LICENSE
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# OR WITHIN THE LOCAL FILE "LICENSE"
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#
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#
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from datetime import date
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# Image utils
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from io import BytesIO
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from typing import Optional
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import PIL
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from django.conf import settings
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from django.core.files.base import ContentFile
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from django.http import HttpRequest
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from django.utils import timezone
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from PIL import ExifTags
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from PIL.Image import Resampling
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def get_start_of_semester(today: Optional[date] = None) -> date:
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"""Return the date of the start of the semester of the given date.
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If no date is given, return the start date of the current semester.
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The current semester is computed as follows:
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- If the date is between 15/08 and 31/12 => Autumn semester.
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- If the date is between 01/01 and 15/02 => Autumn semester of the previous year.
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- If the date is between 15/02 and 15/08 => Spring semester
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Args:
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today: the date to use to compute the semester. If None, use today's date.
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Returns:
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the date of the start of the semester
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"""
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if today is None:
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today = timezone.now().date()
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autumn = date(today.year, *settings.SITH_SEMESTER_START_AUTUMN)
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spring = date(today.year, *settings.SITH_SEMESTER_START_SPRING)
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if today >= autumn: # between 15/08 (included) and 31/12 -> autumn semester
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return autumn
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if today >= spring: # between 15/02 (included) and 15/08 -> spring semester
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return spring
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# between 01/01 and 15/02 -> autumn semester of the previous year
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return autumn.replace(year=autumn.year - 1)
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def get_semester_code(d: Optional[date] = None) -> str:
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"""Return the semester code of the given date.
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If no date is given, return the semester code of the current semester.
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The semester code is an upper letter (A for autumn, P for spring),
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followed by the last two digits of the year.
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For example, the autumn semester of 2018 is "A18".
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Args:
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d: the date to use to compute the semester. If None, use today's date.
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Returns:
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the semester code corresponding to the given date
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"""
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if d is None:
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d = timezone.now().date()
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start = get_start_of_semester(d)
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if (start.month, start.day) == settings.SITH_SEMESTER_START_AUTUMN:
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return "A" + str(start.year)[-2:]
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return "P" + str(start.year)[-2:]
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def scale_dimension(width, height, long_edge):
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ratio = long_edge / max(width, height)
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return int(width * ratio), int(height * ratio)
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def resize_image(im, edge, img_format):
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(w, h) = im.size
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(width, height) = scale_dimension(w, h, long_edge=edge)
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img_format = img_format.upper()
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content = BytesIO()
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# use the lanczos filter for antialiasing and discard the alpha channel
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im = im.resize((width, height), Resampling.LANCZOS)
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if img_format == "JPEG":
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# converting an image with an alpha channel to jpeg would cause a crash
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im = im.convert("RGB")
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try:
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im.save(
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fp=content,
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format=img_format,
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quality=90,
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optimize=True,
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progressive=True,
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)
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except IOError:
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PIL.ImageFile.MAXBLOCK = im.size[0] * im.size[1]
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im.save(
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fp=content,
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format=img_format,
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quality=90,
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optimize=True,
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progressive=True,
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)
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return ContentFile(content.getvalue())
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def exif_auto_rotate(image):
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for orientation in ExifTags.TAGS.keys():
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if ExifTags.TAGS[orientation] == "Orientation":
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break
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exif = dict(image._getexif().items())
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if exif[orientation] == 3:
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image = image.rotate(180, expand=True)
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elif exif[orientation] == 6:
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image = image.rotate(270, expand=True)
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elif exif[orientation] == 8:
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image = image.rotate(90, expand=True)
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return image
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def get_client_ip(request: HttpRequest) -> str | None:
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headers = (
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"X_FORWARDED_FOR", # Common header for proixes
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"FORWARDED", # Standard header defined by RFC 7239.
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"REMOTE_ADDR", # Default IP Address (direct connection)
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)
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for header in headers:
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if (ip := request.META.get(header)) is not None:
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return ip
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return None
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