580 lines
21 KiB
Python
580 lines
21 KiB
Python
import os
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import json
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from io import BytesIO
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from pprint import pprint
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from fastapi import FastAPI, UploadFile, File, Form, HTTPException, Request
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from fastapi.responses import Response
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from fastapi.middleware.cors import CORSMiddleware
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from dotenv import load_dotenv
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from google import genai
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from google.genai.types import Part
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from google.genai import types as genai_types
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from PIL import Image
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import httpx # ✅ for proxy support
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# --- Load .env (for local development only; in Docker envs are already set) ---
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load_dotenv()
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# ---- Gemini SDK + Proxy Setup ----
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GEMINI_API_KEY = os.getenv("GEMINI_API_KEY")
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# Strip whitespace (common issue with .env files)
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if GEMINI_API_KEY:
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GEMINI_API_KEY = GEMINI_API_KEY.strip()
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if not GEMINI_API_KEY:
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raise RuntimeError("GEMINI_API_KEY not set")
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IMAGE_MODEL = "gemini-2.5-flash-image"
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IDENTITY_MODEL = "gemini-2.5-pro" # ✅ current stable multimodal model for identity check
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AUTH_KEY = os.getenv("AIFIT_AUTH_KEY")
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# 🔌 Proxy URL, e.g. "socks5://xray:10808"
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PROXY_URL = os.getenv("AIFIT_PROXY_URL")
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http_options = None
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if PROXY_URL:
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# Use httpx transports so ALL Gemini calls go through Xray
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http_options = genai_types.HttpOptions(
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client_args={
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"transport": httpx.HTTPTransport(proxy=PROXY_URL),
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},
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async_client_args={
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"transport": httpx.AsyncHTTPTransport(proxy=PROXY_URL),
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},
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)
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client = genai.Client(
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api_key=GEMINI_API_KEY,
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http_options=http_options, # ✅ None locally, proxy in server
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)
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app = FastAPI()
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# (Optional) CORS if you call it from frontend directly
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"], # tighten in production
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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def find_first_image_part(resp):
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"""Return the actual output image part."""
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if not getattr(resp, "candidates", None):
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return None
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for cand in resp.candidates:
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content = getattr(cand, "content", None)
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if not content or not getattr(content, "parts", None):
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continue
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for p in content.parts:
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if hasattr(p, "inline_data") and getattr(p.inline_data, "data", None):
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return p.inline_data
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if hasattr(p, "blob") and getattr(p.blob, "data", None):
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return p.blob
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return None
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async def generate_tryon_image(user_part, outfit_part, prompt, previous_image_part=None):
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"""
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Helper function to generate try-on image from Gemini.
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Returns the raw image bytes.
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"""
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contents = [prompt, user_part, outfit_part]
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if previous_image_part:
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contents.append(previous_image_part)
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contents.append("Third image = previous incorrect attempt. Fix it by keeping the original face exactly.")
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else:
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contents.append("First image = user selfie. Second image = outfit reference.")
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print(f"[DEBUG] Generating try-on image with model: {IMAGE_MODEL}")
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if previous_image_part:
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print("[DEBUG] Correction mode: regenerating with face-lock instructions")
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try:
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response = client.models.generate_content(
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model=IMAGE_MODEL,
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contents=contents,
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)
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except Exception as e:
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error_msg = str(e)
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if "API key" in error_msg or "INVALID_ARGUMENT" in error_msg or "API_KEY" in error_msg:
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raise HTTPException(
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status_code=401,
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detail=(
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f"Gemini API key error: {error_msg}. "
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"Please verify your GEMINI_API_KEY in the .env file is correct."
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),
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)
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import traceback
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print(f"[ERROR] Gemini API error: {error_msg}")
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print(traceback.format_exc())
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raise HTTPException(status_code=502, detail=f"Gemini error: {error_msg}")
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# Extract output image
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img_part = find_first_image_part(response)
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if not img_part or not getattr(img_part, "data", None):
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message = "No image returned from Gemini."
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if getattr(response, "candidates", None) and len(response.candidates) > 0:
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cand = response.candidates[0]
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finish_reason = getattr(cand, "finish_reason", "unknown")
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if hasattr(cand, "content") and getattr(cand.content, "parts", None):
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for part in cand.content.parts:
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txt = getattr(part, "text", None)
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if txt:
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message += f" Gemini says: {txt[:500]}"
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break
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if hasattr(cand, "safety_ratings"):
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safety_ratings = cand.safety_ratings
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if safety_ratings:
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blocked = [
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f"{getattr(r, 'category', 'unknown')}"
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for r in safety_ratings
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if hasattr(r, "blocked") and getattr(r, "blocked", False)
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]
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if blocked:
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message += f" Safety blocked: {', '.join(blocked)}"
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raise HTTPException(
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status_code=502,
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detail=f"{message} Finish reason: {finish_reason}",
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)
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else:
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raise HTTPException(
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status_code=502,
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detail="No image returned from Gemini. No candidates in response.",
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)
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raw = img_part.data
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# Ensure valid image bytes
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try:
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Image.open(BytesIO(raw))
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except Exception as e:
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raise HTTPException(
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status_code=500,
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detail=f"Returned image is invalid: {e}. Image size: {len(raw)} bytes",
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)
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return raw
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def faces_match_strict(original_bytes: bytes, edited_bytes: bytes) -> bool:
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"""
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Second Gemini call: compare ORIGINAL vs EDITED and decide
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if identity/face has changed. Returns True if it's clearly
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the same person, False otherwise.
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"""
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print(f"[DEBUG] Identity check using model: {IDENTITY_MODEL}")
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try:
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original_part = Part.from_bytes(
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data=original_bytes,
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mime_type="image/jpeg",
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)
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edited_part = Part.from_bytes(
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data=edited_bytes,
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mime_type="image/png",
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)
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prompt = """
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You are an identity consistency checker.
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You receive TWO photos:
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- FIRST: original_user (the real human photo from the user)
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- SECOND: generated_tryon (the AI-edited try-on result)
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Task:
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1. Decide if the TWO images clearly show the SAME PERSON.
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2. Focus on:
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- overall facial structure and proportions
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- jawline, chin, cheekbones
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- nose shape
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- eye / brow region
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- beard/moustache presence, shape, and density
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- hairline and hairstyle
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3. Ignore clothing changes. We ONLY care about whether the face/identity changed.
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Instructions:
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- If the SECOND image looks like a different model, or the face/identity is noticeably altered
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(different jaw, nose, beard, hairline, etc.), you MUST treat it as a DIFFERENT person.
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- Do NOT be generous. If you are not sure, assume the identity has changed.
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Output format:
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Answer with EXACTLY ONE WORD:
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- "OK" → clearly the same person, acceptable tiny rendering noise
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- "CHANGE" → different person OR visibly altered identity
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No explanations. No extra text.
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"""
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resp = client.models.generate_content(
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model=IDENTITY_MODEL,
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contents=[prompt, original_part, edited_part],
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)
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text = ""
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if getattr(resp, "candidates", None):
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cand = resp.candidates[0]
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if hasattr(cand, "content") and getattr(cand.content, "parts", None):
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for part in cand.content.parts:
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if getattr(part, "text", None):
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text += part.text
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answer = (text or "").strip().upper()
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print(f"[DEBUG] Identity check raw answer: {answer!r}")
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return answer == "OK"
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except Exception as e:
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# If identity check fails for any reason, be SAFE and treat as mismatch
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print(f"[ERROR] Identity check failed: {e!r}")
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return False
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@app.get("/health")
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def health():
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return {"status": "ok"}
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@app.post("/api/try-on/", summary="Try-on (user_photo + outfit_photo + metadata)")
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async def try_on(
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request: Request,
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user_photo: UploadFile = File(...),
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outfit_photo: UploadFile = File(...),
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metadata: str = Form("", description="JSON or text describing the outfit items"),
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):
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"""
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metadata can be:
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- free text: 'black hoodie, patterned shirt, white shorts'
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- JSON: '{"request_id": "uuid", "outer_layer": {...}, "bottom": {"type": "shorts"}}'
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- any additional instructions
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"""
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# ---- AUTH CHECK (simple shared key) ----
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if AUTH_KEY:
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client_key = request.headers.get("X-AIFIT-Key")
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if not client_key or client_key != AUTH_KEY:
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raise HTTPException(status_code=401, detail="Invalid or missing authentication key")
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# ---- Read files ----
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user_bytes = await user_photo.read()
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outfit_bytes = await outfit_photo.read()
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if not user_bytes:
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raise HTTPException(status_code=400, detail="user_photo is empty")
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if not outfit_bytes:
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raise HTTPException(status_code=400, detail="outfit_photo is empty")
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# ---- Parse metadata (JSON or plain text) + extract request_id + dynamic rules ----
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metadata_text = ""
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request_id = None
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extra_rules = ""
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if metadata:
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try:
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meta = json.loads(metadata)
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metadata_text = json.dumps(meta, indent=2, ensure_ascii=False)
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# Try common key names for the UUID
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request_id = meta.get("request_id") or meta.get("id") or meta.get("uuid")
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extra_sections = []
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# Bottom: shorts
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bottom = meta.get("bottom") or {}
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bottom_type = (bottom.get("type") or "").lower()
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if bottom_type == "shorts":
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extra_sections.append(
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"""
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SPECIAL RULE FOR SHORTS (INSANELY STRICT, ZERO TOLERANCE – DO NOT IGNORE):
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- Metadata says the bottom garment is SHORTS.
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- You MUST COMPLETELY REMOVE ANY LONG PANTS OR TROUSERS from the FIRST image.
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- ZERO pants are allowed to remain. No black fabric, no shadows shaped like pants,
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no ghost textures. If any trace of the old pants is left, the result is WRONG and UNUSABLE.
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- From the hem of the shorts down, the legs must be rendered as NATURAL, BARE LEGS
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(with socks/shoes if present) with correct skin tone, shading, lighting, and anatomy.
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- Only the shorts, socks and shoes may cover the legs.
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- You are FORBIDDEN to stack shorts on top of pants. Shorts must fully replace pants.
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- Shorts must match the SECOND image in color, length, silhouette and fit.
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"""
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)
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# Top: t-shirt / tee / short-sleeve
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top = meta.get("top") or meta.get("inner_layer") or meta.get("upper") or meta.get("outer_layer") or {}
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top_type = (top.get("type") or "").lower()
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if any(token in top_type for token in ["t-shirt", "tshirt", "tee", "t shirt"]):
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extra_sections.append(
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"""
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SPECIAL RULE FOR T-SHIRT / TOP (EXTREMELY STRICT, ZERO TOLERANCE):
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- Metadata says the upper garment is a T-SHIRT / SHORT-SLEEVE TOP.
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- You MUST COMPLETELY REMOVE ANY ORIGINAL SHIRT, HOODIE, JACKET OR LONG SLEEVES
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from the FIRST image in the areas covered by the new top.
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- No ghost sleeves, no bits of old collar, no leftover cuffs. If any part of the old top
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or sleeves is still visible, the result is WRONG and MUST BE TREATED AS FAILED.
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- The new T-SHIRT / TOP must match the SECOND image in:
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• color
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• pattern
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• sleeve length
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• collar shape
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• overall fit and silhouette.
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- Do NOT layer the new t-shirt on top of the old garment. It MUST REPLACE the old garment.
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"""
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)
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if extra_sections:
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extra_rules = "\n".join(extra_sections)
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except Exception:
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metadata_text = metadata.strip()
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# ---- Build Prompt (strict identity + clothing) ----
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prompt = f"""
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You are performing a **strict outfit replacement operation** on the FIRST image using the clothing and accessories from the SECOND image and the metadata provided.
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⚠️ IMPORTANT SAFETY CONTEXT
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- The individuals in the images are **not public figures**.
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- The task is standard, allowed **fashion editing / virtual try-on** only.
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- No face, body, or identity manipulation is permitted.
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-----------------------------------------------------
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🚨 ULTRA-HARD IDENTITY LOCK (ABSOLUTE, NON-NEGOTIABLE RULES)
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These identity rules are STRONGER than all other instructions. If you cannot follow them, you MUST NOT output an image.
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- The person in the FIRST image is the ONLY person you are allowed to show in the final image.
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- You MUST keep the FIRST image person's:
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• face
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• identity
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• skin tone
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• facial structure
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• jawline and chin shape
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• nose shape
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• lips and mouth shape
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• facial hair (beard / moustache) style and density
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• hair style and hairline
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• body proportions
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• pose
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EXACTLY as they are.
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ABSOLUTE FACE LOCK (READ-ONLY REGION):
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- Treat the entire face, head, ears, and visible neck area of the FIRST image as a **READ-ONLY REGION**.
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- DO NOT TOUCH the face at all.
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- DO NOT TOUCH identity.
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- Only modify clothing regions.
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- Keep head/face exactly as the original.
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- Do not redraw the face at all.
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- You MUST NOT re-render, redraw, regenerate, beautify, smooth, reshape, de-age, re-gender,
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or otherwise alter the face in any way.
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- The face region in the final image must be **indistinguishable** from the original FIRST image,
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except for tiny unavoidable differences at the clothing boundaries (e.g. collar touching neck).
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If there is ANY conflict between clothing instructions and identity protection:
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YOU MUST PROTECT THE FIRST PERSON'S IDENTITY and only adjust clothing areas.
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If identity cannot be preserved, DO NOT generate an image.
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-----------------------------------------------------
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👤 SECOND IMAGE PERSON HANDLING — CLOTHES ONLY, NEVER THEIR IDENTITY
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- The person in the SECOND image (outfit photo) is **NOT** allowed to appear in the final result.
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- You must treat the SECOND person as a "clothing mannequin" ONLY.
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- You are **STRICTLY FORBIDDEN** from copying:
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• their face
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• their moustache or beard
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• their skin tone
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• their hair
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• their body shape
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• their pose
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• their tattoos or body details
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You may ONLY use the SECOND image to extract:
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• clothing items,
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• shoes,
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• accessories (including the glasses holder strap around the neck),
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• their colors, patterns, materials, and shapes.
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Under NO circumstances may the final image look like the SECOND person.
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It must always clearly be the person from the FIRST image wearing those clothes.
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-----------------------------------------------------
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🎯 PRIMARY OBJECTIVE (ZERO TOLERANCE FOR MISTAKES)
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Replace ALL clothing and accessories in the FIRST IMAGE with the outfit shown in the SECOND IMAGE, cross-verified with the metadata below.
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The replacement must be:
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- Complete (ALL garments changed wherever indicated by the outfit and metadata)
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- Exact (copy the outfit items exactly)
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- Hyper-realistic
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- Seamlessly integrated
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- Physically correct
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-----------------------------------------------------
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👕 OUTFIT SOURCES YOU MUST FOLLOW
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1) SECOND IMAGE (OUTFIT PHOTO) – PRIMARY VISUAL SOURCE
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- Carefully inspect ALL clothing and accessories.
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- Transfer EVERY clothing item visible in the outfit photo.
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2) METADATA (DESCRIPTIVE SOURCE AND HARD CHECKLIST)
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The following metadata describes the outfit and items:
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{metadata_text}
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{extra_rules}
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Treat metadata as a strict checklist: any item marked for change MUST be changed.
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-----------------------------------------------------
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📸 PHOTOREALISM REQUIREMENTS
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- Maintain original exposure, contrast, and white balance.
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- Preserve original depth of field (DOF) and perspective.
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- Do NOT stylize, cartoonize, or apply filters.
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- Avoid blurring, smoothing, or "AI look".
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- The final render must look like a real photo from the same camera and setup.
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-----------------------------------------------------
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🚫 FORBIDDEN ACTIONS
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- Do NOT alter the user's face, identity, or body.
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- Do NOT change background, environment, camera angle, or lighting direction.
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- Do NOT add or remove body parts or tattoos.
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- Do NOT generate a different model.
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- Do NOT copy the second person's face or body.
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- Do NOT output multiple images or side-by-side comparisons.
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- Do NOT output any text in the image.
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- Do NOT ignore the outfit photo or metadata.
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-----------------------------------------------------
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✅ FINAL OUTPUT REQUIREMENT
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Generate ONE single high-resolution, hyper-realistic edited image where:
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- The person from the FIRST image is wearing the outfit from the SECOND image.
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- All clothing and accessories are replaced according to the outfit photo and metadata.
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- The person, pose, background, and scene remain identical except for clothes and accessories.
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FIRST image = user_photo (to edit).
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SECOND image = outfit_photo (outfit reference).
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"""
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# ---- Wrap image files ----
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user_part = Part.from_bytes(
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data=user_bytes,
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mime_type=user_photo.content_type or "image/jpeg",
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)
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outfit_part = Part.from_bytes(
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data=outfit_bytes,
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mime_type=outfit_photo.content_type or "image/jpeg",
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)
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print(f"\n[DEBUG] Metadata received: {metadata[:200] if metadata else '(empty)'}")
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# ============================================================
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# STEP A: Generate initial try-on image (clothing only)
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# ============================================================
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print("\n[STEP A] Generating initial try-on image...")
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try:
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raw_v1 = await generate_tryon_image(user_part, outfit_part, prompt)
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print("[STEP A] ✅ Initial try-on image generated")
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except HTTPException:
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raise
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except Exception as e:
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import traceback
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print(f"[ERROR] Step A failed: {e}")
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print(traceback.format_exc())
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raise HTTPException(status_code=502, detail=f"Failed to generate initial try-on: {str(e)}")
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# ============================================================
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# STEP B: Identity validation check
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# ============================================================
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print("\n[STEP B] Running identity consistency check on initial result...")
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same_identity = faces_match_strict(user_bytes, raw_v1)
|
||
print(f"[STEP B] Identity check result: same_identity={same_identity}")
|
||
|
||
if same_identity:
|
||
# ✅ Identity preserved - return the image
|
||
print("[STEP B] ✅ Identity validated - returning initial result")
|
||
headers = {}
|
||
if request_id:
|
||
headers["X-TryOn-Request-Id"] = str(request_id)
|
||
return Response(content=raw_v1, media_type="image/png", headers=headers)
|
||
|
||
# ============================================================
|
||
# STEP C: Identity changed - regenerate with HARD face lock
|
||
# ============================================================
|
||
print("\n[STEP C] ❌ Identity changed detected - regenerating with face-lock correction...")
|
||
|
||
correction_prompt = f"""
|
||
You changed the user's identity in the previous image generation attempt.
|
||
THIS IS ABSOLUTELY FORBIDDEN.
|
||
|
||
🚫 CRITICAL CORRECTION INSTRUCTIONS:
|
||
|
||
DO NOT TOUCH THE USER'S FACE AT ALL
|
||
DO NOT REDRAW THE FACE
|
||
DO NOT CHANGE IDENTITY, HAIRLINE, BEARD, OR ANY FACIAL FEATURES
|
||
DO NOT CHANGE HEAD SHAPE OR NECK
|
||
DO NOT BEAUTIFY, SMOOTH, OR RESHAPE THE FACE
|
||
DO NOT MODIFY SKIN TONE ON THE FACE
|
||
|
||
YOU MUST KEEP THE FIRST IMAGE FACE EXACTLY, PIXEL BY PIXEL IF POSSIBLE.
|
||
|
||
ONLY modify clothing areas using the outfit reference from the SECOND image.
|
||
Keep the background, lighting, pose, and identity EXACTLY as in the original user photo (FIRST image).
|
||
|
||
The face, head, ears, and neck region from the FIRST image are READ-ONLY.
|
||
Only clothing below the neck and on the body should be changed.
|
||
|
||
{metadata_text}
|
||
|
||
{extra_rules}
|
||
"""
|
||
|
||
# Create a Part from the previous incorrect image for reference
|
||
previous_image_part = Part.from_bytes(
|
||
data=raw_v1,
|
||
mime_type="image/png",
|
||
)
|
||
|
||
try:
|
||
raw_v2 = await generate_tryon_image(user_part, outfit_part, correction_prompt, previous_image_part)
|
||
print("[STEP C] ✅ Correction image generated")
|
||
except HTTPException:
|
||
raise
|
||
except Exception as e:
|
||
import traceback
|
||
print(f"[ERROR] Step C failed: {e}")
|
||
print(traceback.format_exc())
|
||
raise HTTPException(
|
||
status_code=502,
|
||
detail="Failed to generate corrected try-on after identity mismatch.",
|
||
)
|
||
|
||
# ============================================================
|
||
# STEP D: Re-validate corrected version (optional check, always return)
|
||
# ============================================================
|
||
print("\n[STEP D] Running identity consistency check on corrected result...")
|
||
same_identity_v2 = faces_match_strict(user_bytes, raw_v2)
|
||
print(f"[STEP D] Identity check result: same_identity={same_identity_v2}")
|
||
|
||
if same_identity_v2:
|
||
print("[STEP D] ✅ Identity validated after correction")
|
||
else:
|
||
print("[STEP D] ⚠️ Identity check failed, but returning corrected image anyway")
|
||
|
||
# Always return the corrected image, regardless of identity check result
|
||
headers = {}
|
||
if request_id:
|
||
headers["X-TryOn-Request-Id"] = str(request_id)
|
||
|
||
return Response(content=raw_v2, media_type="image/png", headers=headers)
|