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"""
Blob conversion utilities for Gradio image components.
Handles conversion of blob data to proper image file formats.
"""
import hashlib
import os
from typing import Dict, Any
from logging_config import get_logger
# Module logger
logger = get_logger(__name__)
class BlobConverter:
"""Handles conversion of blob data to proper image file formats."""
# File format signatures
FORMAT_SIGNATURES = {
b"\x89PNG\r\n\x1a\n": (".png", "image/png"),
b"\xff\xd8\xff": (".jpg", "image/jpeg"),
b"GIF87a": (".gif", "image/gif"),
b"GIF89a": (".gif", "image/gif"),
}
@classmethod
def is_blob_data(cls, image_data: Dict[str, Any]) -> bool:
"""
Check if the image data represents a blob that needs conversion.
Args:
image_data: Dictionary containing image metadata
Returns:
True if the data is a blob that needs conversion
"""
return (
isinstance(image_data, dict)
and "path" in image_data
and "blob" in image_data["path"]
and image_data.get("size") is None
and image_data.get("orig_name") is None
and image_data.get("mime_type") is None
)
@classmethod
def detect_format(cls, content: bytes) -> tuple[str, str]:
"""
Detect image format from file content.
Args:
content: Binary content of the file
Returns:
Tuple of (extension, mime_type)
"""
for signature, (ext, mime_type) in cls.FORMAT_SIGNATURES.items():
if content.startswith(signature):
return ext, mime_type
# Default to PNG if format cannot be determined
return ".png", "image/png"
@classmethod
def generate_filename(cls, content: bytes, extension: str) -> str:
"""
Generate a unique filename for the converted blob.
Args:
content: Binary content of the file
extension: File extension to use
Returns:
Unique filename
"""
content_hash = hashlib.md5(content).hexdigest()[:8]
return f"flagged_image_{content_hash}{extension}"
@classmethod
def convert_blob(cls, image_data: Dict[str, Any]) -> Dict[str, Any]:
"""
Convert blob data to proper image file format.
Args:
image_data: Original image data dictionary
Returns:
Updated image data with proper file information
"""
if not cls.is_blob_data(image_data):
return image_data
logger.info("Converting blob data: %s", image_data)
blob_path = image_data["path"]
logger.debug("Blob path: %s", blob_path)
# Read blob content
with open(blob_path, "rb") as f:
content = f.read()
file_size = len(content)
logger.debug("File size: %d bytes", file_size)
# Detect format
extension, mime_type = cls.detect_format(content)
logger.debug("Detected format: %s, MIME type: %s", extension, mime_type)
# Generate filename and path
filename = cls.generate_filename(content, extension)
temp_dir = os.path.dirname(blob_path)
new_path = os.path.join(temp_dir, filename)
logger.debug("Generated filename: %s", filename)
logger.debug("New path: %s", new_path)
# Write converted file
with open(new_path, "wb") as f:
f.write(content)
logger.info("Successfully converted blob to: %s", new_path)
# Return updated image data
converted_data = {
"path": new_path,
"url": image_data["url"].replace("blob", filename),
"size": file_size,
"orig_name": filename,
"mime_type": mime_type,
"is_stream": False,
"meta": image_data.get("meta", {}),
}
logger.debug("Converted data: %s", converted_data)
return converted_data
def decode_blob_data(image_data: Dict[str, Any]) -> Dict[str, Any]:
"""
Convenience function to decode blob data from Gradio image component.
Args:
image_data: Image data dictionary from Gradio
Returns:
Converted image data or original data if not a blob
"""
logger.debug("Processing image data: %s", image_data)
result = BlobConverter.convert_blob(image_data)
if result is image_data:
logger.debug("Not a blob, skipping conversion")
else:
logger.info("Blob conversion completed")
return result
def is_blob_data(image_data: Dict[str, Any]) -> bool:
"""
Check if the image data represents a blob that needs conversion.
Args:
image_data: Dictionary containing image metadata
Returns:
True if the data is a blob that needs conversion
"""
return BlobConverter.is_blob_data(image_data)
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