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# Copy from https://github.com/silentsokolov/flask-thumbnails/blob/master/flask_thumbnails/thumbnail.py
import os
from datetime import datetime
import cv2
import time
from io import BytesIO
from pathlib import Path
import numpy as np
# from watchdog.events import FileSystemEventHandler
# from watchdog.observers import Observer
from PIL import Image, ImageOps, PngImagePlugin
from loguru import logger
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=None):
self.app = app
self._default_root_directory = "media"
self._default_thumbnail_directory = "media"
self._default_root_url = "/"
self._default_thumbnail_root_url = "/"
self._default_format = "JPEG"
self.output_dir: Path = None
if app is not None:
self.init_app(app)
self.image_dir_filenames = []
self.output_dir_filenames = []
self.image_dir_observer = None
self.output_dir_observer = None
self.modified_time = {
"image": datetime.utcnow(),
"output": datetime.utcnow(),
}
# def start(self):
# self.image_dir_filenames = self._media_names(self.root_directory)
# self.output_dir_filenames = self._media_names(self.output_dir)
#
# logger.info(f"Start watching image directory: {self.root_directory}")
# self.image_dir_observer = Observer()
# self.image_dir_observer.schedule(self, self.root_directory, recursive=False)
# self.image_dir_observer.start()
#
# logger.info(f"Start watching output directory: {self.output_dir}")
# self.output_dir_observer = Observer()
# self.output_dir_observer.schedule(self, self.output_dir, recursive=False)
# self.output_dir_observer.start()
def on_modified(self, event):
if not os.path.isdir(event.src_path):
return
if event.src_path == str(self.root_directory):
logger.info(f"Image directory {event.src_path} modified")
self.image_dir_filenames = self._media_names(self.root_directory)
self.modified_time["image"] = datetime.utcnow()
elif event.src_path == str(self.output_dir):
logger.info(f"Output directory {event.src_path} modified")
self.output_dir_filenames = self._media_names(self.output_dir)
self.modified_time["output"] = datetime.utcnow()
def init_app(self, app):
if self.app is None:
self.app = app
app.thumbnail_instance = self
if not hasattr(app, "extensions"):
app.extensions = {}
if "thumbnail" in app.extensions:
raise RuntimeError("Flask-thumbnail extension already initialized")
app.extensions["thumbnail"] = self
app.config.setdefault("THUMBNAIL_MEDIA_ROOT", self._default_root_directory)
app.config.setdefault(
"THUMBNAIL_MEDIA_THUMBNAIL_ROOT", self._default_thumbnail_directory
)
app.config.setdefault("THUMBNAIL_MEDIA_URL", self._default_root_url)
app.config.setdefault(
"THUMBNAIL_MEDIA_THUMBNAIL_URL", self._default_thumbnail_root_url
)
app.config.setdefault("THUMBNAIL_DEFAULT_FORMAT", self._default_format)
@property
def root_directory(self):
path = self.app.config["THUMBNAIL_MEDIA_ROOT"]
if os.path.isabs(path):
return path
else:
return os.path.join(self.app.root_path, path)
@property
def thumbnail_directory(self):
path = self.app.config["THUMBNAIL_MEDIA_THUMBNAIL_ROOT"]
if os.path.isabs(path):
return path
else:
return os.path.join(self.app.root_path, path)
@property
def root_url(self):
return self.app.config["THUMBNAIL_MEDIA_URL"]
@property
def media_names(self):
# return self.image_dir_filenames
return self._media_names(self.root_directory)
@property
def output_media_names(self):
return self._media_names(self.output_dir)
# return self.output_dir_filenames
@staticmethod
def _media_names(directory: Path):
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(
{
"name": name,
"height": img.height,
"width": img.width,
"ctime": os.path.getctime(path),
"mtime": os.path.getmtime(path),
}
)
return res
@property
def thumbnail_url(self):
return self.app.config["THUMBNAIL_MEDIA_THUMBNAIL_URL"]
def get_thumbnail(
self, directory: Path, original_filename: str, width, height, **options
):
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 width is not None:
height = int(image.height * width / image.width)
else:
width = int(image.width * height / image.height)
thumbnail_size = (width, height)
thumbnail_filename = generate_filename(
original_filename,
aspect_to_string(thumbnail_size),
crop,
background,
quality,
)
thumbnail_filepath = os.path.join(
self.thumbnail_directory, original_path, thumbnail_filename
)
thumbnail_url = os.path.join(
self.thumbnail_url, original_path, thumbnail_filename
)
if storage.exists(thumbnail_filepath):
return thumbnail_url, (width, height)
try:
image.load()
except (IOError, OSError):
self.app.logger.warning("Thumbnail not load image: %s", original_filepath)
return thumbnail_url, (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_url, (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 self.app.config["THUMBNAIL_DEFAULT_FORMAT"]
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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