213 lines
6.9 KiB
Python
213 lines
6.9 KiB
Python
# Copy from https://github.com/silentsokolov/flask-thumbnails/blob/master/flask_thumbnails/thumbnail.py
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import os
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from cachetools import TTLCache, cached
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import cv2
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import time
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from io import BytesIO
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from pathlib import Path
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import numpy as np
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from PIL import Image, ImageOps, PngImagePlugin
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LARGE_ENOUGH_NUMBER = 100
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PngImagePlugin.MAX_TEXT_CHUNK = LARGE_ENOUGH_NUMBER * (1024 ** 2)
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from .storage_backends import FilesystemStorageBackend
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from .utils import aspect_to_string, generate_filename, glob_img
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class FileManager:
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def __init__(self, app=None):
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self.app = app
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self._default_root_directory = "media"
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self._default_thumbnail_directory = "media"
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self._default_root_url = "/"
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self._default_thumbnail_root_url = "/"
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self._default_format = "JPEG"
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self.output_dir: Path = None
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if app is not None:
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self.init_app(app)
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def init_app(self, app):
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if self.app is None:
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self.app = app
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app.thumbnail_instance = self
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if not hasattr(app, "extensions"):
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app.extensions = {}
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if "thumbnail" in app.extensions:
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raise RuntimeError("Flask-thumbnail extension already initialized")
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app.extensions["thumbnail"] = self
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app.config.setdefault("THUMBNAIL_MEDIA_ROOT", self._default_root_directory)
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app.config.setdefault("THUMBNAIL_MEDIA_THUMBNAIL_ROOT", self._default_thumbnail_directory)
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app.config.setdefault("THUMBNAIL_MEDIA_URL", self._default_root_url)
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app.config.setdefault("THUMBNAIL_MEDIA_THUMBNAIL_URL", self._default_thumbnail_root_url)
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app.config.setdefault("THUMBNAIL_DEFAULT_FORMAT", self._default_format)
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def save_to_output_directory(self, image: np.ndarray, filename: str):
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fp = Path(filename)
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new_name = fp.stem + f"_{int(time.time())}" + fp.suffix
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if image.shape[2] == 3:
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image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
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elif image.shape[2] == 4:
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image = cv2.cvtColor(image, cv2.COLOR_RGBA2BGRA)
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cv2.imwrite(str(self.output_dir / new_name), image)
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@property
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def root_directory(self):
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path = self.app.config["THUMBNAIL_MEDIA_ROOT"]
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if os.path.isabs(path):
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return path
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else:
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return os.path.join(self.app.root_path, path)
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@property
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def thumbnail_directory(self):
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path = self.app.config["THUMBNAIL_MEDIA_THUMBNAIL_ROOT"]
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if os.path.isabs(path):
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return path
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else:
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return os.path.join(self.app.root_path, path)
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@property
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def root_url(self):
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return self.app.config["THUMBNAIL_MEDIA_URL"]
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@property
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@cached(cache=TTLCache(maxsize=1024, ttl=30))
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def media_names(self):
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return self._media_names(self.root_directory)
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@property
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@cached(cache=TTLCache(maxsize=1024, ttl=30))
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def output_media_names(self):
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return self._media_names(self.output_dir)
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@staticmethod
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def _media_names(directory: Path):
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names = sorted([it.name for it in glob_img(directory)])
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res = []
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for name in names:
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path = os.path.join(directory, name)
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img = Image.open(path)
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res.append({"name": name, "height": img.height, "width": img.width, "ctime": os.path.getctime(path)})
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return res
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@property
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def thumbnail_url(self):
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return self.app.config["THUMBNAIL_MEDIA_THUMBNAIL_URL"]
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def get_thumbnail(self, directory: Path, original_filename: str, width, height, **options):
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storage = FilesystemStorageBackend(self.app)
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crop = options.get("crop", "fit")
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background = options.get("background")
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quality = options.get("quality", 90)
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original_path, original_filename = os.path.split(original_filename)
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original_filepath = os.path.join(directory, original_path, original_filename)
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image = Image.open(BytesIO(storage.read(original_filepath)))
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# keep ratio resize
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if width is not None:
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height = int(image.height * width / image.width)
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else:
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width = int(image.width * height / image.height)
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thumbnail_size = (width, height)
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thumbnail_filename = generate_filename(
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original_filename, aspect_to_string(thumbnail_size), crop, background, quality
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)
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thumbnail_filepath = os.path.join(
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self.thumbnail_directory, original_path, thumbnail_filename
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)
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thumbnail_url = os.path.join(self.thumbnail_url, original_path, thumbnail_filename)
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if storage.exists(thumbnail_filepath):
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return thumbnail_url, (width, height)
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try:
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image.load()
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except (IOError, OSError):
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self.app.logger.warning("Thumbnail not load image: %s", original_filepath)
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return thumbnail_url, (width, height)
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# get original image format
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options["format"] = options.get("format", image.format)
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image = self._create_thumbnail(image, thumbnail_size, crop, background=background)
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raw_data = self.get_raw_data(image, **options)
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storage.save(thumbnail_filepath, raw_data)
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return thumbnail_url, (width, height)
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def get_raw_data(self, image, **options):
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data = {
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"format": self._get_format(image, **options),
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"quality": options.get("quality", 90),
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}
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_file = BytesIO()
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image.save(_file, **data)
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return _file.getvalue()
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@staticmethod
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def colormode(image, colormode="RGB"):
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if colormode == "RGB" or colormode == "RGBA":
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if image.mode == "RGBA":
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return image
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if image.mode == "LA":
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return image.convert("RGBA")
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return image.convert(colormode)
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if colormode == "GRAY":
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return image.convert("L")
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return image.convert(colormode)
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@staticmethod
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def background(original_image, color=0xFF):
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size = (max(original_image.size),) * 2
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image = Image.new("L", size, color)
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image.paste(
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original_image,
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tuple(map(lambda x: (x[0] - x[1]) / 2, zip(size, original_image.size))),
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)
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return image
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def _get_format(self, image, **options):
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if options.get("format"):
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return options.get("format")
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if image.format:
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return image.format
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return self.app.config["THUMBNAIL_DEFAULT_FORMAT"]
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def _create_thumbnail(self, image, size, crop="fit", background=None):
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try:
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resample = Image.Resampling.LANCZOS
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except AttributeError: # pylint: disable=raise-missing-from
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resample = Image.ANTIALIAS
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if crop == "fit":
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image = ImageOps.fit(image, size, resample)
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else:
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image = image.copy()
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image.thumbnail(size, resample=resample)
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if background is not None:
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image = self.background(image)
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image = self.colormode(image)
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return image
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