backend/open_webui/routers/images.py

import asyncio
import base64
import json
import logging
import mimetypes
import re
import uuid
from pathlib import Path
from typing import Optional

import requests


from fastapi import Depends, FastAPI, HTTPException, Request, APIRouter
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel


from open_webui.config import CACHE_DIR
from open_webui.constants import ERROR_MESSAGES
from open_webui.env import ENV, SRC_LOG_LEVELS, ENABLE_FORWARD_USER_INFO_HEADERS

from open_webui.utils.auth import get_admin_user, get_verified_user
from open_webui.utils.images.comfyui import (
    ComfyUIGenerateImageForm,
    ComfyUIWorkflow,
    comfyui_generate_image,
)


log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["IMAGES"])

IMAGE_CACHE_DIR = Path(CACHE_DIR).joinpath("./image/generations/")
IMAGE_CACHE_DIR.mkdir(parents=True, exist_ok=True)


router = APIRouter()


@router.get("/config")
async def get_config(request: Request, user=Depends(get_admin_user)):
    return {
        "enabled": request.app.state.config.ENABLE_IMAGE_GENERATION,
        "engine": request.app.state.config.IMAGE_GENERATION_ENGINE,
        "openai": {
            "OPENAI_API_BASE_URL": request.app.state.config.IMAGES_OPENAI_API_BASE_URL,
            "OPENAI_API_KEY": request.app.state.config.IMAGES_OPENAI_API_KEY,
        },
        "automatic1111": {
            "AUTOMATIC1111_BASE_URL": request.app.state.config.AUTOMATIC1111_BASE_URL,
            "AUTOMATIC1111_API_AUTH": request.app.state.config.AUTOMATIC1111_API_AUTH,
            "AUTOMATIC1111_CFG_SCALE": request.app.state.config.AUTOMATIC1111_CFG_SCALE,
            "AUTOMATIC1111_SAMPLER": request.app.state.config.AUTOMATIC1111_SAMPLER,
            "AUTOMATIC1111_SCHEDULER": request.app.state.config.AUTOMATIC1111_SCHEDULER,
        },
        "comfyui": {
            "COMFYUI_BASE_URL": request.app.state.config.COMFYUI_BASE_URL,
            "COMFYUI_API_KEY": request.app.state.config.COMFYUI_API_KEY,
            "COMFYUI_WORKFLOW": request.app.state.config.COMFYUI_WORKFLOW,
            "COMFYUI_WORKFLOW_NODES": request.app.state.config.COMFYUI_WORKFLOW_NODES,
        },
    }


class OpenAIConfigForm(BaseModel):
    OPENAI_API_BASE_URL: str
    OPENAI_API_KEY: str


class Automatic1111ConfigForm(BaseModel):
    AUTOMATIC1111_BASE_URL: str
    AUTOMATIC1111_API_AUTH: str
    AUTOMATIC1111_CFG_SCALE: Optional[str | float | int]
    AUTOMATIC1111_SAMPLER: Optional[str]
    AUTOMATIC1111_SCHEDULER: Optional[str]


class ComfyUIConfigForm(BaseModel):
    COMFYUI_BASE_URL: str
    COMFYUI_API_KEY: str
    COMFYUI_WORKFLOW: str
    COMFYUI_WORKFLOW_NODES: list[dict]


class ConfigForm(BaseModel):
    enabled: bool
    engine: str
    openai: OpenAIConfigForm
    automatic1111: Automatic1111ConfigForm
    comfyui: ComfyUIConfigForm


@router.post("/config/update")
async def update_config(
    request: Request, form_data: ConfigForm, user=Depends(get_admin_user)
):
    request.app.state.config.IMAGE_GENERATION_ENGINE = form_data.engine
    request.app.state.config.ENABLE_IMAGE_GENERATION = form_data.enabled

    request.app.state.config.IMAGES_OPENAI_API_BASE_URL = (
        form_data.openai.OPENAI_API_BASE_URL
    )
    request.app.state.config.IMAGES_OPENAI_API_KEY = form_data.openai.OPENAI_API_KEY

    request.app.state.config.AUTOMATIC1111_BASE_URL = (
        form_data.automatic1111.AUTOMATIC1111_BASE_URL
    )
    request.app.state.config.AUTOMATIC1111_API_AUTH = (
        form_data.automatic1111.AUTOMATIC1111_API_AUTH
    )

    request.app.state.config.AUTOMATIC1111_CFG_SCALE = (
        float(form_data.automatic1111.AUTOMATIC1111_CFG_SCALE)
        if form_data.automatic1111.AUTOMATIC1111_CFG_SCALE
        else None
    )
    request.app.state.config.AUTOMATIC1111_SAMPLER = (
        form_data.automatic1111.AUTOMATIC1111_SAMPLER
        if form_data.automatic1111.AUTOMATIC1111_SAMPLER
        else None
    )
    request.app.state.config.AUTOMATIC1111_SCHEDULER = (
        form_data.automatic1111.AUTOMATIC1111_SCHEDULER
        if form_data.automatic1111.AUTOMATIC1111_SCHEDULER
        else None
    )

    request.app.state.config.COMFYUI_BASE_URL = (
        form_data.comfyui.COMFYUI_BASE_URL.strip("/")
    )
    request.app.state.config.COMFYUI_WORKFLOW = form_data.comfyui.COMFYUI_WORKFLOW
    request.app.state.config.COMFYUI_WORKFLOW_NODES = (
        form_data.comfyui.COMFYUI_WORKFLOW_NODES
    )

    return {
        "enabled": request.app.state.config.ENABLE_IMAGE_GENERATION,
        "engine": request.app.state.config.IMAGE_GENERATION_ENGINE,
        "openai": {
            "OPENAI_API_BASE_URL": request.app.state.config.IMAGES_OPENAI_API_BASE_URL,
            "OPENAI_API_KEY": request.app.state.config.IMAGES_OPENAI_API_KEY,
        },
        "automatic1111": {
            "AUTOMATIC1111_BASE_URL": request.app.state.config.AUTOMATIC1111_BASE_URL,
            "AUTOMATIC1111_API_AUTH": request.app.state.config.AUTOMATIC1111_API_AUTH,
            "AUTOMATIC1111_CFG_SCALE": request.app.state.config.AUTOMATIC1111_CFG_SCALE,
            "AUTOMATIC1111_SAMPLER": request.app.state.config.AUTOMATIC1111_SAMPLER,
            "AUTOMATIC1111_SCHEDULER": request.app.state.config.AUTOMATIC1111_SCHEDULER,
        },
        "comfyui": {
            "COMFYUI_BASE_URL": request.app.state.config.COMFYUI_BASE_URL,
            "COMFYUI_API_KEY": request.app.state.config.COMFYUI_API_KEY,
            "COMFYUI_WORKFLOW": request.app.state.config.COMFYUI_WORKFLOW,
            "COMFYUI_WORKFLOW_NODES": request.app.state.config.COMFYUI_WORKFLOW_NODES,
        },
    }


def get_automatic1111_api_auth(request: Request):
    if request.app.state.config.AUTOMATIC1111_API_AUTH is None:
        return ""
    else:
        auth1111_byte_string = request.app.state.config.AUTOMATIC1111_API_AUTH.encode(
            "utf-8"
        )
        auth1111_base64_encoded_bytes = base64.b64encode(auth1111_byte_string)
        auth1111_base64_encoded_string = auth1111_base64_encoded_bytes.decode("utf-8")
        return f"Basic {auth1111_base64_encoded_string}"


@router.get("/config/url/verify")
async def verify_url(request: Request, user=Depends(get_admin_user)):
    if request.app.state.config.IMAGE_GENERATION_ENGINE == "automatic1111":
        try:
            r = requests.get(
                url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/options",
                headers={"authorization": get_automatic1111_api_auth(request)},
            )
            r.raise_for_status()
            return True
        except Exception:
            request.app.state.config.ENABLE_IMAGE_GENERATION = False
            raise HTTPException(status_code=400, detail=ERROR_MESSAGES.INVALID_URL)
    elif request.app.state.config.IMAGE_GENERATION_ENGINE == "comfyui":
        try:
            r = requests.get(
                url=f"{request.app.state.config.COMFYUI_BASE_URL}/object_info"
            )
            r.raise_for_status()
            return True
        except Exception:
            request.app.state.config.ENABLE_IMAGE_GENERATION = False
            raise HTTPException(status_code=400, detail=ERROR_MESSAGES.INVALID_URL)
    else:
        return True


def set_image_model(request: Request, model: str):
    log.info(f"Setting image model to {model}")
    request.app.state.config.IMAGE_GENERATION_MODEL = model
    if request.app.state.config.IMAGE_GENERATION_ENGINE in ["", "automatic1111"]:
        api_auth = get_automatic1111_api_auth()
        r = requests.get(
            url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/options",
            headers={"authorization": api_auth},
        )
        options = r.json()
        if model != options["sd_model_checkpoint"]:
            options["sd_model_checkpoint"] = model
            r = requests.post(
                url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/options",
                json=options,
                headers={"authorization": api_auth},
            )
    return request.app.state.config.IMAGE_GENERATION_MODEL


def get_image_model(request):
    if request.app.state.config.IMAGE_GENERATION_ENGINE == "openai":
        return (
            request.app.state.config.IMAGE_GENERATION_MODEL
            if request.app.state.config.IMAGE_GENERATION_MODEL
            else "dall-e-2"
        )
    elif request.app.state.config.IMAGE_GENERATION_ENGINE == "comfyui":
        return (
            request.app.state.config.IMAGE_GENERATION_MODEL
            if request.app.state.config.IMAGE_GENERATION_MODEL
            else ""
        )
    elif (
        request.app.state.config.IMAGE_GENERATION_ENGINE == "automatic1111"
        or request.app.state.config.IMAGE_GENERATION_ENGINE == ""
    ):
        try:
            r = requests.get(
                url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/options",
                headers={"authorization": get_automatic1111_api_auth()},
            )
            options = r.json()
            return options["sd_model_checkpoint"]
        except Exception as e:
            request.app.state.config.ENABLE_IMAGE_GENERATION = False
            raise HTTPException(status_code=400, detail=ERROR_MESSAGES.DEFAULT(e))


class ImageConfigForm(BaseModel):
    MODEL: str
    IMAGE_SIZE: str
    IMAGE_STEPS: int


@router.get("/image/config")
async def get_image_config(request: Request, user=Depends(get_admin_user)):
    return {
        "MODEL": request.app.state.config.IMAGE_GENERATION_MODEL,
        "IMAGE_SIZE": request.app.state.config.IMAGE_SIZE,
        "IMAGE_STEPS": request.app.state.config.IMAGE_STEPS,
    }


@router.post("/image/config/update")
async def update_image_config(
    request: Request, form_data: ImageConfigForm, user=Depends(get_admin_user)
):

    set_image_model(request, form_data.MODEL)

    pattern = r"^\d+x\d+$"
    if re.match(pattern, form_data.IMAGE_SIZE):
        request.app.state.config.IMAGE_SIZE = form_data.IMAGE_SIZE
    else:
        raise HTTPException(
            status_code=400,
            detail=ERROR_MESSAGES.INCORRECT_FORMAT("  (e.g., 512x512)."),
        )

    if form_data.IMAGE_STEPS >= 0:
        request.app.state.config.IMAGE_STEPS = form_data.IMAGE_STEPS
    else:
        raise HTTPException(
            status_code=400,
            detail=ERROR_MESSAGES.INCORRECT_FORMAT("  (e.g., 50)."),
        )

    return {
        "MODEL": request.app.state.config.IMAGE_GENERATION_MODEL,
        "IMAGE_SIZE": request.app.state.config.IMAGE_SIZE,
        "IMAGE_STEPS": request.app.state.config.IMAGE_STEPS,
    }


@router.get("/models")
def get_models(request: Request, user=Depends(get_verified_user)):
    try:
        if request.app.state.config.IMAGE_GENERATION_ENGINE == "openai":
            return [
                {"id": "dall-e-2", "name": "DALL·E 2"},
                {"id": "dall-e-3", "name": "DALL·E 3"},
            ]
        elif request.app.state.config.IMAGE_GENERATION_ENGINE == "comfyui":
            # TODO - get models from comfyui
            headers = {
                "Authorization": f"Bearer {request.app.state.config.COMFYUI_API_KEY}"
            }
            r = requests.get(
                url=f"{request.app.state.config.COMFYUI_BASE_URL}/object_info",
                headers=headers,
            )
            info = r.json()

            workflow = json.loads(request.app.state.config.COMFYUI_WORKFLOW)
            model_node_id = None

            for node in request.app.state.config.COMFYUI_WORKFLOW_NODES:
                if node["type"] == "model":
                    if node["node_ids"]:
                        model_node_id = node["node_ids"][0]
                    break

            if model_node_id:
                model_list_key = None

                print(workflow[model_node_id]["class_type"])
                for key in info[workflow[model_node_id]["class_type"]]["input"][
                    "required"
                ]:
                    if "_name" in key:
                        model_list_key = key
                        break

                if model_list_key:
                    return list(
                        map(
                            lambda model: {"id": model, "name": model},
                            info[workflow[model_node_id]["class_type"]]["input"][
                                "required"
                            ][model_list_key][0],
                        )
                    )
            else:
                return list(
                    map(
                        lambda model: {"id": model, "name": model},
                        info["CheckpointLoaderSimple"]["input"]["required"][
                            "ckpt_name"
                        ][0],
                    )
                )
        elif (
            request.app.state.config.IMAGE_GENERATION_ENGINE == "automatic1111"
            or request.app.state.config.IMAGE_GENERATION_ENGINE == ""
        ):
            r = requests.get(
                url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/sd-models",
                headers={"authorization": get_automatic1111_api_auth()},
            )
            models = r.json()
            return list(
                map(
                    lambda model: {"id": model["title"], "name": model["model_name"]},
                    models,
                )
            )
    except Exception as e:
        request.app.state.config.ENABLE_IMAGE_GENERATION = False
        raise HTTPException(status_code=400, detail=ERROR_MESSAGES.DEFAULT(e))


class GenerateImageForm(BaseModel):
    model: Optional[str] = None
    prompt: str
    size: Optional[str] = None
    n: int = 1
    negative_prompt: Optional[str] = None


def save_b64_image(b64_str):
    try:
        image_id = str(uuid.uuid4())

        if "," in b64_str:
            header, encoded = b64_str.split(",", 1)
            mime_type = header.split(";")[0]

            img_data = base64.b64decode(encoded)
            image_format = mimetypes.guess_extension(mime_type)

            image_filename = f"{image_id}{image_format}"
            file_path = IMAGE_CACHE_DIR / f"{image_filename}"
            with open(file_path, "wb") as f:
                f.write(img_data)
            return image_filename
        else:
            image_filename = f"{image_id}.png"
            file_path = IMAGE_CACHE_DIR.joinpath(image_filename)

            img_data = base64.b64decode(b64_str)

            # Write the image data to a file
            with open(file_path, "wb") as f:
                f.write(img_data)
            return image_filename

    except Exception as e:
        log.exception(f"Error saving image: {e}")
        return None


def save_url_image(url):
    image_id = str(uuid.uuid4())
    try:
        r = requests.get(url)
        r.raise_for_status()
        if r.headers["content-type"].split("/")[0] == "image":
            mime_type = r.headers["content-type"]
            image_format = mimetypes.guess_extension(mime_type)

            if not image_format:
                raise ValueError("Could not determine image type from MIME type")

            image_filename = f"{image_id}{image_format}"

            file_path = IMAGE_CACHE_DIR.joinpath(f"{image_filename}")
            with open(file_path, "wb") as image_file:
                for chunk in r.iter_content(chunk_size=8192):
                    image_file.write(chunk)
            return image_filename
        else:
            log.error("Url does not point to an image.")
            return None

    except Exception as e:
        log.exception(f"Error saving image: {e}")
        return None


@router.post("/generations")
async def image_generations(
    request: Request,
    form_data: GenerateImageForm,
    user=Depends(get_verified_user),
):
    width, height = tuple(map(int, request.app.state.config.IMAGE_SIZE.split("x")))

    r = None
    try:
        if request.app.state.config.IMAGE_GENERATION_ENGINE == "openai":
            headers = {}
            headers["Authorization"] = (
                f"Bearer {request.app.state.config.IMAGES_OPENAI_API_KEY}"
            )
            headers["Content-Type"] = "application/json"

            if ENABLE_FORWARD_USER_INFO_HEADERS:
                headers["X-OpenWebUI-User-Name"] = user.name
                headers["X-OpenWebUI-User-Id"] = user.id
                headers["X-OpenWebUI-User-Email"] = user.email
                headers["X-OpenWebUI-User-Role"] = user.role

            data = {
                "model": (
                    request.app.state.config.IMAGE_GENERATION_MODEL
                    if request.app.state.config.IMAGE_GENERATION_MODEL != ""
                    else "dall-e-2"
                ),
                "prompt": form_data.prompt,
                "n": form_data.n,
                "size": (
                    form_data.size
                    if form_data.size
                    else request.app.state.config.IMAGE_SIZE
                ),
                "response_format": "b64_json",
            }

            # Use asyncio.to_thread for the requests.post call
            r = await asyncio.to_thread(
                requests.post,
                url=f"{request.app.state.config.IMAGES_OPENAI_API_BASE_URL}/images/generations",
                json=data,
                headers=headers,
            )

            r.raise_for_status()
            res = r.json()

            images = []

            for image in res["data"]:
                image_filename = save_b64_image(image["b64_json"])
                images.append({"url": f"/cache/image/generations/{image_filename}"})
                file_body_path = IMAGE_CACHE_DIR.joinpath(f"{image_filename}.json")

                with open(file_body_path, "w") as f:
                    json.dump(data, f)

            return images

        elif request.app.state.config.IMAGE_GENERATION_ENGINE == "comfyui":
            data = {
                "prompt": form_data.prompt,
                "width": width,
                "height": height,
                "n": form_data.n,
            }

            if request.app.state.config.IMAGE_STEPS is not None:
                data["steps"] = request.app.state.config.IMAGE_STEPS

            if form_data.negative_prompt is not None:
                data["negative_prompt"] = form_data.negative_prompt

            form_data = ComfyUIGenerateImageForm(
                **{
                    "workflow": ComfyUIWorkflow(
                        **{
                            "workflow": request.app.state.config.COMFYUI_WORKFLOW,
                            "nodes": request.app.state.config.COMFYUI_WORKFLOW_NODES,
                        }
                    ),
                    **data,
                }
            )
            res = await comfyui_generate_image(
                request.app.state.config.IMAGE_GENERATION_MODEL,
                form_data,
                user.id,
                request.app.state.config.COMFYUI_BASE_URL,
                request.app.state.config.COMFYUI_API_KEY,
            )
            log.debug(f"res: {res}")

            images = []

            for image in res["data"]:
                image_filename = save_url_image(image["url"])
                images.append({"url": f"/cache/image/generations/{image_filename}"})
                file_body_path = IMAGE_CACHE_DIR.joinpath(f"{image_filename}.json")

                with open(file_body_path, "w") as f:
                    json.dump(form_data.model_dump(exclude_none=True), f)

            log.debug(f"images: {images}")
            return images
        elif (
            request.app.state.config.IMAGE_GENERATION_ENGINE == "automatic1111"
            or request.app.state.config.IMAGE_GENERATION_ENGINE == ""
        ):
            if form_data.model:
                set_image_model(form_data.model)

            data = {
                "prompt": form_data.prompt,
                "batch_size": form_data.n,
                "width": width,
                "height": height,
            }

            if request.app.state.config.IMAGE_STEPS is not None:
                data["steps"] = request.app.state.config.IMAGE_STEPS

            if form_data.negative_prompt is not None:
                data["negative_prompt"] = form_data.negative_prompt

            if request.app.state.config.AUTOMATIC1111_CFG_SCALE:
                data["cfg_scale"] = request.app.state.config.AUTOMATIC1111_CFG_SCALE

            if request.app.state.config.AUTOMATIC1111_SAMPLER:
                data["sampler_name"] = request.app.state.config.AUTOMATIC1111_SAMPLER

            if request.app.state.config.AUTOMATIC1111_SCHEDULER:
                data["scheduler"] = request.app.state.config.AUTOMATIC1111_SCHEDULER

            # Use asyncio.to_thread for the requests.post call
            r = await asyncio.to_thread(
                requests.post,
                url=f"{request.app.state.config.AUTOMATIC1111_BASE_URL}/sdapi/v1/txt2img",
                json=data,
                headers={"authorization": get_automatic1111_api_auth()},
            )

            res = r.json()
            log.debug(f"res: {res}")

            images = []

            for image in res["images"]:
                image_filename = save_b64_image(image)
                images.append({"url": f"/cache/image/generations/{image_filename}"})
                file_body_path = IMAGE_CACHE_DIR.joinpath(f"{image_filename}.json")

                with open(file_body_path, "w") as f:
                    json.dump({**data, "info": res["info"]}, f)

            return images
    except Exception as e:
        error = e
        if r != None:
            data = r.json()
            if "error" in data:
                error = data["error"]["message"]
        raise HTTPException(status_code=400, detail=ERROR_MESSAGES.DEFAULT(error))