app.py

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
import requests
import random
import os
from fastapi.responses import Response

app = FastAPI()

API_URL = f'https://api-inference.huggingface.co/models/{os.getenv("HF_MODEL")}'
headers = {'Authorization': f'Bearer {os.getenv("HF_TOKEN")}'}
timeout = 100

class ImageRequest(BaseModel):
    prompt: str
    negative_prompt: str = "(deformed, distorted, disfigured), poorly drawn, bad anatomy"
    steps: int = 4
    cfg_scale: float = 7.0
    sampler: str = "DPM++ 2M Karras"
    seed: int = -1
    strength: float = 0.7

def query(prompt: str, negative_prompt: str, steps: int, cfg_scale: float, 
          sampler: str, seed: int, strength: float):
    if not prompt:
        raise HTTPException(status_code=400, detail="Prompt is required")

    payload = {
        "inputs": prompt,
        "is_negative": bool(negative_prompt),
        "steps": steps,
        "cfg_scale": cfg_scale,
        "seed": seed if seed != -1 else random.randint(1, 1000000000),
        "strength": strength
    }

    if negative_prompt:
        payload["negative_prompt"] = negative_prompt

    response = requests.post(API_URL, headers=headers, json=payload, timeout=timeout)
    
    if response.status_code != 200:
        raise HTTPException(status_code=response.status_code, detail=response.text)
    
    return response.content

@app.post("/generate")
async def generate_image(request: ImageRequest):
    try:
        raw_data = query(
            prompt=request.prompt,
            negative_prompt=request.negative_prompt,
            steps=request.steps,
            cfg_scale=request.cfg_scale,
            sampler=request.sampler,
            seed=request.seed,
            strength=request.strength
        )
        return Response(content=raw_data, media_type="application/octet-stream")
    except HTTPException as e:
        raise e
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))