ragflow/api/utils/base64_image.py

import base64
import logging
from functools import partial
from io import BytesIO

from PIL import Image

test_image_base64 = "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAA6ElEQVR4nO3QwQ3AIBDAsIP9d25XIC+EZE8QZc18w5l9O+AlZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBT+IYAHHLHkdEgAAAABJRU5ErkJggg=="
test_image = base64.b64decode(test_image_base64)


async def image2id(d: dict, storage_put_func: partial, objname:str, bucket:str="imagetemps"):
    import logging
    from io import BytesIO
    import trio
    from rag.svr.task_executor import minio_limiter
    if not d.get("image"):
        return

    with BytesIO() as output_buffer:
        if isinstance(d["image"], bytes):
            output_buffer.write(d["image"])
            output_buffer.seek(0)
        else:
            # If the image is in RGBA mode, convert it to RGB mode before saving it in JPEG format.
            if d["image"].mode in ("RGBA", "P"):
                converted_image = d["image"].convert("RGB")
                d["image"] = converted_image
            try:
                d["image"].save(output_buffer, format='JPEG')
            except OSError as e:
                logging.warning(
                    "Saving image exception, ignore: {}".format(str(e)))

        async with minio_limiter:
            await trio.to_thread.run_sync(lambda: storage_put_func(bucket=bucket, fnm=objname, binary=output_buffer.getvalue()))
        d["img_id"] = f"{bucket}-{objname}"
        if not isinstance(d["image"], bytes):
            d["image"].close()
        del d["image"]  # Remove image reference


def id2image(image_id:str|None, storage_get_func: partial):
    if not image_id:
        return
    arr = image_id.split("-")
    if len(arr) != 2:
        return
    bkt, nm = image_id.split("-")
    try:
        blob = storage_get_func(bucket=bkt, filename=nm)
        if not blob:
            return
        return Image.open(BytesIO(blob))
    except Exception as e:
        logging.exception(e)