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Create telegram_preview.py

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  1. telegram_preview.py +149 -0
telegram_preview.py ADDED
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+ """
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+ Reusable Telegram‑bot preview router.
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+
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+ Exposes:
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+ • GET / – HTML preview card
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+ • GET /avatar.jpg – bot avatar (streamed, in‑memory)
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+
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+ To use: `from telegram_preview import router` and include it in your FastAPI app.
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+ Compatible with Python 3.8+ (uses typing.Optional, no PEP 604 syntax).
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+ """
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+
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+ import io
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+ import os
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+ import requests
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+ from typing import Optional
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+
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+ from fastapi import APIRouter, Response
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+ from fastapi.responses import HTMLResponse, StreamingResponse
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+
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+ # ─── Environment ───────────────────────────────────────────────────────────────
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+ TOKEN = os.getenv("BOT_TOKEN") # required
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+ BOT_USERNAME = os.getenv("BOT_USERNAME", "python3463_bot")
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+ FALLBACK_IMG = "https://telegram.org/img/t_logo.png" # fallback logo URL
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+
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+ if not TOKEN:
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+ raise RuntimeError("TOKEN environment variable not set")
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+
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+ API_ROOT = f"https://api.telegram.org/bot{TOKEN}"
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+
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+ router = APIRouter()
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+
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+
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+ # ─── Helpers ───────────────────────────────────────────────────────────────────
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+ def _get_description() -> str:
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+ """Try short → full → empty string."""
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+ try:
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+ r = requests.get(f"{API_ROOT}/getMyShortDescription", timeout=5).json()
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+ if (desc := r["result"].get("short_description")):
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+ return desc
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+ except Exception:
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+ pass
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+
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+ try:
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+ r = requests.get(f"{API_ROOT}/getMyDescription", timeout=5).json()
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+ return r["result"].get("description", "")
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+ except Exception:
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+ return ""
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+
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+
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+ def _fetch_avatar_bytes() -> Optional[bytes]:
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+ """Return the newest avatar as bytes, or None if missing/error."""
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+ try:
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+ me = requests.get(f"{API_ROOT}/getMe", timeout=5).json()
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+ user_id = me["result"]["id"]
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+
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+ photos = requests.get(
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+ f"{API_ROOT}/getUserProfilePhotos",
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+ params={"user_id": user_id, "limit": 1},
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+ timeout=5,
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+ ).json()
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+
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+ if photos["result"]["total_count"] == 0:
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+ return None
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+
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+ file_id = photos["result"]["photos"][0][-1]["file_id"]
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+ file_obj = requests.get(
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+ f"{API_ROOT}/getFile", params={"file_id": file_id}, timeout=5
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+ ).json()
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+ file_path = file_obj["result"]["file_path"]
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+
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+ resp = requests.get(
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+ f"https://api.telegram.org/file/bot{TOKEN}/{file_path}", timeout=10
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+ )
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+ if resp.status_code == 200:
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+ return resp.content
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+ except Exception as exc:
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+ print("Avatar fetch error:", exc)
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+
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+ return None
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+
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+
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+ # ─── Routes ────────────────────────────────────────────────────────────────────
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+ @router.get("/", include_in_schema=False, response_class=HTMLResponse)
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+ def bot_preview():
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+ description = _get_description()
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+
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+ html = f"""
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+ <html>
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+ <head>
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+ <title>@{BOT_USERNAME}</title>
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+ <style>
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+ body {{
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+ font-family: sans-serif;
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+ display: flex;
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+ justify-content: center;
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+ padding: 40px;
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+ background: #f7f7f7;
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+ }}
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+ .card {{
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+ max-width: 420px;
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+ background: #fff;
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+ padding: 24px;
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+ text-align: center;
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+ border-radius: 12px;
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+ box-shadow: 0 4px 12px rgba(0,0,0,.1);
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+ }}
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+ .avatar {{
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+ width: 120px;
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+ height: 120px;
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+ border-radius: 50%;
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+ object-fit: cover;
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+ background: #ddd;
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+ }}
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+ .btn {{
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+ display: inline-block;
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+ margin-top: 16px;
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+ padding: 12px 24px;
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+ background: #2AABEE;
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+ color: #fff;
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+ border-radius: 8px;
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+ text-decoration: none;
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+ font-weight: bold;
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+ }}
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+ </style>
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+ </head>
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+ <body>
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+ <div class="card">
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+ <img src="avatar.jpg" class="avatar" alt="avatar">
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+ <h2>@{BOT_USERNAME}</h2>
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+ <p>{description}</p>
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+ <a class="btn" href="https://t.me/{BOT_USERNAME}" target="_blank">
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+ Start Bot
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+ </a>
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+ </div>
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+ </body>
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+ </html>
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+ """
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+ return HTMLResponse(html)
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+
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+
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+ @router.get("/avatar.jpg", include_in_schema=False)
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+ def serve_avatar():
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+ """Streams avatar JPEG or Telegram logo (PNG) as fallback."""
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+ data = _fetch_avatar_bytes()
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+ if data:
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+ return StreamingResponse(io.BytesIO(data), media_type="image/jpeg")
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+
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+ fallback = requests.get(FALLBACK_IMG, timeout=10)
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+ return Response(content=fallback.content, media_type="image/png")