mirror of
https://code.lenaisten.de/Lenaisten/advent22.git
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150 lines
3.3 KiB
Python
150 lines
3.3 KiB
Python
import itertools
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import random
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import re
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from io import BytesIO
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from typing import Any, Self, Sequence, cast
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from fastapi import Depends
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from fastapi.responses import StreamingResponse
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from PIL import Image, ImageFont
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from ..config import Config, get_config
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from ..dav_common import dav_file_exists, dav_get_file, dav_list_files
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from ._image import _XY, AdventImage
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##########
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# RANDOM #
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##########
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class Random(random.Random):
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@classmethod
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async def get(cls, bonus_salt: Any = "") -> Self:
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cfg = await get_config()
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return cls(f"{cfg.puzzle.solution}{bonus_salt}{cfg.puzzle.random_pepper}")
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async def set_length(seq: Sequence, length: int) -> list:
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# `seq` unendlich wiederholen
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infinite = itertools.cycle(seq)
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# Die ersten `length` einträge nehmen
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return list(itertools.islice(infinite, length))
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async def shuffle(seq: Sequence, rnd: random.Random | None = None) -> list:
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# Zufallsgenerator
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rnd = rnd or await Random.get()
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# Elemente mischen
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return rnd.sample(seq, len(seq))
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#########
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# IMAGE #
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#########
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async def get_letter(
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index: int,
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cfg: Config = Depends(get_config),
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) -> str:
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return (await shuffle(cfg.puzzle.solution))[index]
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async def list_images_auto() -> list[str]:
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"""
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Finde alle Bilder im "automatisch"-Verzeichnis
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"""
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ls = await dav_list_files(
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re.compile(r"\.(gif|jpe?g|tiff?|png|bmp)$", flags=re.IGNORECASE),
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"/images_auto",
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)
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ls = await set_length(ls, 24)
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return await shuffle(ls)
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async def load_image(
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file_name: str,
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) -> AdventImage:
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"""
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Versuche, Bild aus Datei zu laden
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"""
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if not await dav_file_exists(file_name):
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raise RuntimeError(f"DAV-File {file_name} does not exist!")
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img_buffer = await dav_get_file(file_name)
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img_buffer.seek(0)
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return await AdventImage.load_standard(img_buffer)
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async def get_auto_image(
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index: int,
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letter: str,
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images: list[str],
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cfg: Config,
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) -> AdventImage:
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"""
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Erstelle automatisch generiertes Bild
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"""
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# hier niemals RuntimeError!
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image = await load_image(images[index])
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rnd = await Random.get(index)
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font = await dav_get_file(f"files/{cfg.server.font}")
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font.seek(0)
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# Buchstabe verstecken
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await image.hide_text(
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xy=cast(_XY, tuple(rnd.choices(range(30, 470), k=2))),
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text=letter,
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font=ImageFont.truetype(font, 50),
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)
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return image
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async def get_image(
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index: int,
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letter: str = Depends(get_letter),
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images: list[str] = Depends(list_images_auto),
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cfg: Config = Depends(get_config),
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) -> AdventImage:
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"""
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Bild für einen Tag erstellen
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"""
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try:
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# Versuche, aus "manual"-Ordner zu laden
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return await load_image(f"images_manual/{index}.jpg")
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except RuntimeError:
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# Erstelle automatisch generiertes Bild
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return await get_auto_image(
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index=index,
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letter=letter,
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images=images,
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cfg=cfg,
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)
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async def api_return_image(
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img: Image.Image,
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) -> StreamingResponse:
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"""
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Bild mit API zurückgeben
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"""
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# Bilddaten in Puffer laden
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img_buffer = BytesIO()
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img.save(img_buffer, format="JPEG", quality=85)
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img_buffer.seek(0)
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# zurückgeben
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return StreamingResponse(
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content=img_buffer,
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media_type="image/jpeg",
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)
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