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import os
from io import BytesIO
from pathlib import Path
from typing import List
from PIL import Image, ImageOps, PngImagePlugin
from fastapi import FastAPI, UploadFile, HTTPException
from starlette.responses import FileResponse
from ..schema import MediasResponse, MediaTab
LARGE_ENOUGH_NUMBER = 100
PngImagePlugin.MAX_TEXT_CHUNK = LARGE_ENOUGH_NUMBER * (1024**2)
from .storage_backends import FilesystemStorageBackend
from .utils import aspect_to_string, generate_filename, glob_img
class FileManager:
def __init__(self, app: FastAPI, input_dir: Path, output_dir: Path):
self.app = app
self.input_dir: Path = input_dir
self.output_dir: Path = output_dir
self.image_dir_filenames = []
self.output_dir_filenames = []
if not self.thumbnail_directory.exists():
self.thumbnail_directory.mkdir(parents=True)
# fmt: off
self.app.add_api_route("/api/v1/medias", self.api_medias, methods=["GET"], response_model=List[MediasResponse])
self.app.add_api_route("/api/v1/media_file", self.api_media_file, methods=["GET"])
self.app.add_api_route("/api/v1/media_thumbnail_file", self.api_media_thumbnail_file, methods=["GET"])
# fmt: on
def api_medias(self, tab: MediaTab) -> List[MediasResponse]:
img_dir = self._get_dir(tab)
return self._media_names(img_dir)
def api_media_file(self, tab: MediaTab, filename: str) -> FileResponse:
file_path = self._get_file(tab, filename)
return FileResponse(file_path, media_type="image/png")
# tab=${tab}?filename=${filename.name}?width=${width}&height=${height}
def api_media_thumbnail_file(
self, tab: MediaTab, filename: str, width: int, height: int
) -> FileResponse:
img_dir = self._get_dir(tab)
thumb_filename, (width, height) = self.get_thumbnail(
img_dir, filename, width=width, height=height
)
thumbnail_filepath = self.thumbnail_directory / thumb_filename
return FileResponse(
thumbnail_filepath,
headers={
"X-Width": str(width),
"X-Height": str(height),
},
media_type="image/jpeg",
)
def _get_dir(self, tab: MediaTab) -> Path:
if tab == "input":
return self.input_dir
elif tab == "output":
return self.output_dir
else:
raise HTTPException(status_code=422, detail=f"tab not found: {tab}")
def _get_file(self, tab: MediaTab, filename: str) -> Path:
file_path = self._get_dir(tab) / filename
if not file_path.exists():
raise HTTPException(status_code=422, detail=f"file not found: {file_path}")
return file_path
@property
def thumbnail_directory(self) -> Path:
return self.output_dir / "thumbnails"
@staticmethod
def _media_names(directory: Path) -> List[MediasResponse]:
names = sorted([it.name for it in glob_img(directory)])
res = []
for name in names:
path = os.path.join(directory, name)
img = Image.open(path)
res.append(
MediasResponse(
name=name,
height=img.height,
width=img.width,
ctime=os.path.getctime(path),
mtime=os.path.getmtime(path),
)
)
return res
def get_thumbnail(
self, directory: Path, original_filename: str, width, height, **options
):
directory = Path(directory)
storage = FilesystemStorageBackend(self.app)
crop = options.get("crop", "fit")
background = options.get("background")
quality = options.get("quality", 90)
original_path, original_filename = os.path.split(original_filename)
original_filepath = os.path.join(directory, original_path, original_filename)
image = Image.open(BytesIO(storage.read(original_filepath)))
# keep ratio resize
if not width and not height:
width = 256
if width != 0:
height = int(image.height * width / image.width)
else:
width = int(image.width * height / image.height)
thumbnail_size = (width, height)
thumbnail_filename = generate_filename(
directory,
original_filename,
aspect_to_string(thumbnail_size),
crop,
background,
quality,
)
thumbnail_filepath = os.path.join(
self.thumbnail_directory, original_path, thumbnail_filename
)
if storage.exists(thumbnail_filepath):
return thumbnail_filepath, (width, height)
try:
image.load()
except (IOError, OSError):
self.app.logger.warning("Thumbnail not load image: %s", original_filepath)
return thumbnail_filepath, (width, height)
# get original image format
options["format"] = options.get("format", image.format)
image = self._create_thumbnail(
image, thumbnail_size, crop, background=background
)
raw_data = self.get_raw_data(image, **options)
storage.save(thumbnail_filepath, raw_data)
return thumbnail_filepath, (width, height)
def get_raw_data(self, image, **options):
data = {
"format": self._get_format(image, **options),
"quality": options.get("quality", 90),
}
_file = BytesIO()
image.save(_file, **data)
return _file.getvalue()
@staticmethod
def colormode(image, colormode="RGB"):
if colormode == "RGB" or colormode == "RGBA":
if image.mode == "RGBA":
return image
if image.mode == "LA":
return image.convert("RGBA")
return image.convert(colormode)
if colormode == "GRAY":
return image.convert("L")
return image.convert(colormode)
@staticmethod
def background(original_image, color=0xFF):
size = (max(original_image.size),) * 2
image = Image.new("L", size, color)
image.paste(
original_image,
tuple(map(lambda x: (x[0] - x[1]) / 2, zip(size, original_image.size))),
)
return image
def _get_format(self, image, **options):
if options.get("format"):
return options.get("format")
if image.format:
return image.format
return "JPEG"
def _create_thumbnail(self, image, size, crop="fit", background=None):
try:
resample = Image.Resampling.LANCZOS
except AttributeError: # pylint: disable=raise-missing-from
resample = Image.ANTIALIAS
if crop == "fit":
image = ImageOps.fit(image, size, resample)
else:
image = image.copy()
image.thumbnail(size, resample=resample)
if background is not None:
image = self.background(image)
image = self.colormode(image)
return image
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