direct link generate plugin (#118)

* Add link generation utility

* Update linkgen.py

---------

Co-authored-by: Abhi <85984486+AbhiTheModder@users.noreply.github.com>

Author: ramanveerji

utils/linkgen.py

@@ -0,0 +1,86 @@
+#  Moon-Userbot - telegram userbot
+#  Copyright (C) 2020-present Moon Userbot Organization
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import asyncio
+from pyrogram import Client, filters
+from pyrogram.errors import UserBlocked
+from pyrogram.types import Message
+from utils.misc import modules_help, prefix
+from utils.scripts import format_exc
+from utils.db import db
+
+BOT_KEY = "LINKGEN_BOT"
+
+def is_supported_media(message: Message) -> bool:
+    return bool(message.audio or message.document or message.video)
+
+async def get_file_link(client: Client, file_message: Message, bot_username: str) -> str:
+    try:
+        forwarded = await file_message.forward(bot_username)
+        await asyncio.sleep(3)
+        async for msg in client.get_chat_history(bot_username, limit=1):
+            if msg.text and "http" in msg.text:
+                return msg.text
+        return "No response from bot"
+    except UserBlocked:
+        return f"❌ <b>Please unblock</b> <code>{bot_username}</code> <b>first</b>"
+    except Exception as e:
+        return f"<b>Error:</b> <i>{format_exc(e)}</i>"
+
+@Client.on_message(filters.command("l", prefix) & filters.me)
+async def generate_link(client: Client, message: Message):
+    replied = message.reply_to_message
+    bot_username = db.get("custom.linkgen", BOT_KEY)
+
+    if not bot_username:
+        return await message.edit(f"❌ <b>No bot set.</b> Use <code>{prefix}addbot @botusername</code> first.")
+
+    if not replied:
+        return await message.edit("<b>❌ Reply to a supported file</b> (audio/document/video).")
+
+    if not is_supported_media(replied):
+        return await message.edit("<b>❌ Unsupported file type.</b>")
+
+    status_msg = await message.edit("<i>⏳ Generating download link...</i>")
+
+    try:
+        link = await get_file_link(client, replied, bot_username)
+        await status_msg.edit(f"<b>✅ Download Link:</b>\n\n<code>{link}</code>")
+    except Exception as e:
+        await status_msg.edit(f"<b>⚠️ Error:</b> <i>{format_exc(e)}</i>")
+
+@Client.on_message(filters.command("addbot", prefix) & filters.me)
+async def add_bot(_, message: Message):
+    if len(message.command) < 2:
+        return await message.edit(f"❌ <b>Usage:</b> <code>{prefix}addbot @botusername</code>")
+    
+    bot_username = message.command[1]
+    if not bot_username.startswith("@"):
+        return await message.edit("❌ <b>Please provide a valid bot username starting with</b> <code>@</code>")
+    
+    db.set("custom.linkgen", BOT_KEY, bot_username)
+    await message.edit(f"✅ <b>Bot set to:</b> <code>{bot_username}</code>")
+
+@Client.on_message(filters.command("delbot", prefix) & filters.me)
+async def delete_bot(_, message: Message):
+    db.set("custom.linkgen", BOT_KEY, None)
+    await message.edit(f"✅ <b>Bot removed successfully.</b>\nYou can add again using <code>{prefix}addbot @botusername</code>.")
+
+modules_help["linkgen"] = {
+    "l [reply]": "Generate direct download link for audio/document/video files",
+    "addbot @botusername": "Set bot used to generate file links",
+    "delbot": "Remove currently set bot"
+}