import re
from io import BytesIO
import base64
from .typing import ImageType, Union
from PIL import Image
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'webp'}
def to_image(image: ImageType) -> Image.Image:
"""
Converts the input image to a PIL Image object.
Args:
image (Union[str, bytes, Image.Image]): The input image.
Returns:
Image.Image: The converted PIL Image object.
"""
if isinstance(image, str):
is_data_uri_an_image(image)
image = extract_data_uri(image)
if isinstance(image, bytes):
is_accepted_format(image)
image = Image.open(BytesIO(image))
elif not isinstance(image, Image.Image):
image = Image.open(image)
copy = image.copy()
copy.format = image.format
image = copy
return image
def is_allowed_extension(filename: str) -> bool:
"""
Checks if the given filename has an allowed extension.
Args:
filename (str): The filename to check.
Returns:
bool: True if the extension is allowed, False otherwise.
"""
return '.' in filename and \
filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
def is_data_uri_an_image(data_uri: str) -> bool:
"""
Checks if the given data URI represents an image.
Args:
data_uri (str): The data URI to check.
Raises:
ValueError: If the data URI is invalid or the image format is not allowed.
"""
# Check if the data URI starts with 'data:image' and contains an image format (e.g., jpeg, png, gif)
if not re.match(r'data:image/(\w+);base64,', data_uri):
raise ValueError("Invalid data URI image.")
# Extract the image format from the data URI
image_format = re.match(r'data:image/(\w+);base64,', data_uri).group(1)
# Check if the image format is one of the allowed formats (jpg, jpeg, png, gif)
if image_format.lower() not in ALLOWED_EXTENSIONS:
raise ValueError("Invalid image format (from mime file type).")
def is_accepted_format(binary_data: bytes) -> bool:
"""
Checks if the given binary data represents an image with an accepted format.
Args:
binary_data (bytes): The binary data to check.
Raises:
ValueError: If the image format is not allowed.
"""
if binary_data.startswith(b'\xFF\xD8\xFF'):
pass # It's a JPEG image
elif binary_data.startswith(b'\x89PNG\r\n\x1a\n'):
pass # It's a PNG image
elif binary_data.startswith(b'GIF87a') or binary_data.startswith(b'GIF89a'):
pass # It's a GIF image
elif binary_data.startswith(b'\x89JFIF') or binary_data.startswith(b'JFIF\x00'):
pass # It's a JPEG image
elif binary_data.startswith(b'\xFF\xD8'):
pass # It's a JPEG image
elif binary_data.startswith(b'RIFF') and binary_data[8:12] == b'WEBP':
pass # It's a WebP image
else:
raise ValueError("Invalid image format (from magic code).")
def extract_data_uri(data_uri: str) -> bytes:
"""
Extracts the binary data from the given data URI.
Args:
data_uri (str): The data URI.
Returns:
bytes: The extracted binary data.
"""
data = data_uri.split(",")[1]
data = base64.b64decode(data)
return data
def get_orientation(image: Image.Image) -> int:
"""
Gets the orientation of the given image.
Args:
image (Image.Image): The image.
Returns:
int: The orientation value.
"""
exif_data = image.getexif() if hasattr(image, 'getexif') else image._getexif()
if exif_data is not None:
orientation = exif_data.get(274) # 274 corresponds to the orientation tag in EXIF
if orientation is not None:
return orientation
def process_image(img: Image.Image, new_width: int, new_height: int) -> Image.Image:
"""
Processes the given image by adjusting its orientation and resizing it.
Args:
img (Image.Image): The image to process.
new_width (int): The new width of the image.
new_height (int): The new height of the image.
Returns:
Image.Image: The processed image.
"""
orientation = get_orientation(img)
if orientation:
if orientation > 4:
img = img.transpose(Image.FLIP_LEFT_RIGHT)
if orientation in [3, 4]:
img = img.transpose(Image.ROTATE_180)
if orientation in [5, 6]:
img = img.transpose(Image.ROTATE_270)
if orientation in [7, 8]:
img = img.transpose(Image.ROTATE_90)
img.thumbnail((new_width, new_height))
return img
def to_base64(image: Image.Image, compression_rate: float) -> str:
"""
Converts the given image to a base64-encoded string.
Args:
image (Image.Image): The image to convert.
compression_rate (float): The compression rate (0.0 to 1.0).
Returns:
str: The base64-encoded image.
"""
output_buffer = BytesIO()
image.save(output_buffer, format="JPEG", quality=int(compression_rate * 100))
return base64.b64encode(output_buffer.getvalue()).decode()
def format_images_markdown(images, alt: str, preview: str="{image}?w=200&h=200") -> str:
"""
Formats the given images as a markdown string.
Args:
images: The images to format.
alt (str): The alt for the images.
preview (str, optional): The preview URL format. Defaults to "{image}?w=200&h=200".
Returns:
str: The formatted markdown string.
"""
if isinstance(images, str):
images = f"[})]({images})"
else:
images = [f"[})]({image})" for idx, image in enumerate(images)]
images = "\n".join(images)
start_flag = "<!-- generated images start -->\n"
end_flag = "<!-- generated images end -->\n"
return f"\n{start_flag}{images}\n{end_flag}\n"
def to_bytes(image: Image.Image) -> bytes:
"""
Converts the given image to bytes.
Args:
image (Image.Image): The image to convert.
Returns:
bytes: The image as bytes.
"""
bytes_io = BytesIO()
image.save(bytes_io, image.format)
image.seek(0)
return bytes_io.getvalue()
class ImageResponse():
def __init__(
self,
images: Union[str, list],
alt: str,
options: dict = {}
):
self.images = images
self.alt = alt
self.options = options
def __str__(self) -> str:
return format_images_markdown(self.images, self.alt)
def get(self, key: str):
return self.options.get(key)
