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from fastapi import FastAPI, Response, Depends
from fastapi.middleware.cors import CORSMiddleware
import torch
from torch.cuda.amp import autocast
from diffusers import DiffusionPipeline
from io import BytesIO
import os
app = FastAPI()
app.add_middleware(
CORSMiddleware,
allow_credentials=True,
allow_origins=["*"],
allow_methods=["*"],
allow_headers=["*"]
)
model_id = "stabilityai/stable-diffusion-xl-base-1.0"
device = "cuda" if torch.cuda.is_available() else "cpu"
pipe = DiffusionPipeline.from_pretrained(model_id, torch_dtype=torch.float32, use_safetensors=True, variant="fp16")
pipe = pipe.to(device)
def get_secret(secret_key: str = Depends(lambda x: x.headers.get("secret-key"))):
return secret_key
@app.post("/")
def generate(prompt: str, secret: str = Depends(get_secret)):
if secret != os.getenv("SECRET_KEY"):
return Response(content="Unauthorized", status_code=401)
with autocast(device):
image = pipe(prompt, guidance_scale=8.5).images[0]
buffer = BytesIO()
image.save(buffer, format="PNG")
buffer.seek(0)
return Response(content=buffer.getvalue(), media_type="image/png")
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