from __future__ import annotations
import re
from io import BytesIO
import base64
from .typing import ImageType, Union, Image
try:
from PIL.Image import open as open_image, new as new_image
from PIL.Image import FLIP_LEFT_RIGHT, ROTATE_180, ROTATE_270, ROTATE_90
has_requirements = True
except ImportError:
has_requirements = False
from .errors import MissingRequirementsError
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'webp', 'svg'}
EXTENSIONS_MAP: dict[str, str] = {
"image/png": "png",
"image/jpeg": "jpg",
"image/gif": "gif",
"image/webp": "webp",
}
def fix_url(url:str) -> str:
""" replace ' ' by '+' (to be markdown compliant)"""
return url.replace(" ","+")
def to_image(image: ImageType, is_svg: bool = False) -> Image:
"""
Converts the input image to a PIL Image object.
Args:
image (Union[str, bytes, Image]): The input image.
Returns:
Image: The converted PIL Image object.
"""
if not has_requirements:
raise MissingRequirementsError('Install "pillow" package for images')
if isinstance(image, str):
is_data_uri_an_image(image)
image = extract_data_uri(image)
if is_svg:
try:
import cairosvg
except ImportError:
raise MissingRequirementsError('Install "cairosvg" package for svg images')
if not isinstance(image, bytes):
image = image.read()
buffer = BytesIO()
cairosvg.svg2png(image, write_to=buffer)
return open_image(buffer)
if isinstance(image, bytes):
is_accepted_format(image)
return open_image(BytesIO(image))
elif not isinstance(image, Image):
image = open_image(image)
image.load()
return image
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).lower()
# Check if the image format is one of the allowed formats (jpg, jpeg, png, gif)
if image_format not in ALLOWED_EXTENSIONS and image_format != "svg+xml":
raise ValueError("Invalid image format (from mime file type).")
def is_accepted_format(binary_data: bytes) -> str:
"""
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'):
return "image/jpeg"
elif binary_data.startswith(b'\x89PNG\r\n\x1a\n'):
return "image/png"
elif binary_data.startswith(b'GIF87a') or binary_data.startswith(b'GIF89a'):
return "image/gif"
elif binary_data.startswith(b'\x89JFIF') or binary_data.startswith(b'JFIF\x00'):
return "image/jpeg"
elif binary_data.startswith(b'\xFF\xD8'):
return "image/jpeg"
elif binary_data.startswith(b'RIFF') and binary_data[8:12] == b'WEBP':
return "image/webp"
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) -> int:
"""
Gets the orientation of the given image.
Args:
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(image: Image, new_width: int, new_height: int) -> Image:
"""
Processes the given image by adjusting its orientation and resizing it.
Args:
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: The processed image.
"""
# Fix orientation
orientation = get_orientation(image)
if orientation:
if orientation > 4:
image = image.transpose(FLIP_LEFT_RIGHT)
if orientation in [3, 4]:
image = image.transpose(ROTATE_180)
if orientation in [5, 6]:
image = image.transpose(ROTATE_270)
if orientation in [7, 8]:
image = image.transpose(ROTATE_90)
# Resize image
image.thumbnail((new_width, new_height))
# Remove transparency
if image.mode == "RGBA":
image.load()
white = new_image('RGB', image.size, (255, 255, 255))
white.paste(image, mask=image.split()[-1])
return white
# Convert to RGB for jpg format
elif image.mode != "RGB":
image = image.convert("RGB")
return image
def to_base64_jpg(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: Union[str, list], alt: str, preview: Union[str, list] = None) -> 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):
result = f"[ if preview else images)})]({fix_url(images)})"
else:
if not isinstance(preview, list):
preview = [preview.replace('{image}', image) if preview else image for image in images]
result = "\n".join(
f"[})]({fix_url(image)})"
#f'[<img src="{preview[idx]}" width="200" alt="#{idx+1} {alt}">]({image})'
for idx, image in enumerate(images)
)
start_flag = "<!-- generated images start -->\n"
end_flag = "<!-- generated images end -->\n"
return f"\n{start_flag}{result}\n{end_flag}\n"
def to_bytes(image: ImageType) -> bytes:
"""
Converts the given image to bytes.
Args:
image (ImageType): The image to convert.
Returns:
bytes: The image as bytes.
"""
if isinstance(image, bytes):
return image
elif isinstance(image, str):
is_data_uri_an_image(image)
return extract_data_uri(image)
elif isinstance(image, Image):
bytes_io = BytesIO()
image.save(bytes_io, image.format)
image.seek(0)
return bytes_io.getvalue()
else:
return image.read()
def to_data_uri(image: ImageType) -> str:
if not isinstance(image, str):
data = to_bytes(image)
data_base64 = base64.b64encode(data).decode()
return f"data:{is_accepted_format(data)};base64,{data_base64}"
return image
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, self.get("preview"))
def get(self, key: str):
return self.options.get(key)
def get_list(self) -> list[str]:
return [self.images] if isinstance(self.images, str) else self.images
class ImagePreview(ImageResponse):
def __str__(self):
return ""
def to_string(self):
return super().__str__()
class ImageDataResponse():
def __init__(
self,
images: Union[str, list],
alt: str,
):
self.images = images
self.alt = alt
def get_list(self) -> list[str]:
return [self.images] if isinstance(self.images, str) else self.images
class ImageRequest:
def __init__(
self,
options: dict = {}
):
self.options = options
def get(self, key: str):
return self.options.get(key)
