88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
import json
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import uuid
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from pathlib import Path
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from typing import Optional
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from fastapi import APIRouter, File, Form, UploadFile
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from sse_starlette.sse import EventSourceResponse
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from app.agent.loop import run_agent_loop
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from app.config import get_image_models_list, get_default_image_model_id
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router = APIRouter()
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UPLOADS_DIR = Path(__file__).parent.parent.parent / "uploads"
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async def _save_upload(file: UploadFile) -> str:
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"""保存上传的参考图，返回可访问的 URL 路径。"""
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ext = Path(file.filename).suffix or ".png"
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filename = f"{uuid.uuid4().hex}{ext}"
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filepath = UPLOADS_DIR / filename
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content = await file.read()
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filepath.write_bytes(content)
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return f"/uploads/{filename}"
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@router.post("/upload-ref-image")
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async def upload_ref_image(
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file: UploadFile = File(...),
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):
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"""
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独立的参考图上传端点。
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前端选图后立即调用，返回服务端路径，供后续发消息时引用。
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"""
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UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
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url = await _save_upload(file)
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return {"url": url, "filename": file.filename}
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@router.get("/models")
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async def list_models():
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"""返回可用的图像生成模型列表。"""
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return {
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"models": get_image_models_list(),
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"default": get_default_image_model_id(),
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}
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@router.post("/chat")
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async def chat(
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messages: str = Form(...),
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ref_image: Optional[UploadFile] = File(None),
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ref_image_url: Optional[str] = Form(None),
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image_model: Optional[str] = Form(None),
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session_id: Optional[str] = Form(None),
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):
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"""
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主对话端点。
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参数：
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- messages: JSON 字符串，对话历史 [{role, content}]
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- ref_image: 可选的参考图文件（兼容旧方式）
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- ref_image_url: 可选，已通过 /upload-ref-image 上传后的服务端路径
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- image_model: 可选，指定本次使用的生图模型短 ID
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- session_id: 可选，前端会话 ID，用于 Mem0 记忆作用域
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"""
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parsed_messages = json.loads(messages)
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resolved_ref_url: Optional[str] = None
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if ref_image_url:
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resolved_ref_url = ref_image_url
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elif ref_image and ref_image.filename:
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resolved_ref_url = await _save_upload(ref_image)
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async def event_generator():
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async for event in run_agent_loop(
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parsed_messages,
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resolved_ref_url,
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image_model=image_model,
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session_id=session_id,
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):
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yield {
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"event": event["type"],
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"data": json.dumps(event["data"], ensure_ascii=False),
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}
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return EventSourceResponse(event_generator())
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