patch 6493c04f9d8bdb7b1d2c037fdd66c337a7a91af5
Author: E. Bosch <presidev@AT@gmail.com>
Date:   Sun May 31 00:26:34 CEST 2026
  * utils: Modify sanitize_filename(): convert invalid chars to hex representation,
  this makes the filenames deterministic for the same session,
  and helps to not download a file more than once
patch dd18dbebc3877faa7fe1c7f1257fb3a4048aab32
Author: E. Bosch <presidev@AT@gmail.com>
Date:   Sat May 30 22:25:32 CEST 2026
  * utils: In add_filename() don't put a final dot if there is no extension in the filename
patch feebc9eac596c484be6e5f67934196e64d52beeb
Author: E. Bosch <presidev@AT@gmail.com>
Date:   Sat May 30 21:33:57 CEST 2026
  * telegram: Refactor download media routine
  optimized to download files only once
  utils: Add session tokens for unnamed files
diff -rN -u old-irgramd/telegram.py new-irgramd/telegram.py
--- old-irgramd/telegram.py	2026-06-09 16:28:16.940707302 +0200
+++ new-irgramd/telegram.py	2026-06-09 16:28:16.940707302 +0200
@@ -23,7 +23,7 @@
 from include import CHAN_MAX_LENGTH, NICK_MAX_LENGTH
 from irc import IRCUser
 from utils import sanitize_filename, add_filename, is_url_equiv, extract_url, get_human_size, get_human_duration
-from utils import get_highlighted, fix_braces, format_timestamp, pretty, current_date
+from utils import get_highlighted, fix_braces, format_timestamp, pretty, current_date, token
 import emoji2emoticon as e
 
 # Test IP table
@@ -44,6 +44,8 @@
         self.notice_size = settings['download_notice'] * 1048576
         self.media_dir  = settings['media_dir']
         self.media_url  = settings['media_url']
+        if self.media_url[-1:] != '/':
+            self.media_url += '/'
         self.upload_dir = settings['upload_dir']
         self.api_id     = settings['api_id']
         self.api_hash   = settings['api_hash']
@@ -59,7 +61,8 @@
         self.geo_url    = settings['geo_url']
         if not settings['emoji_ascii']:
             e.emo = {}
-        self.media_cn   = 0
+        self.token = token('+0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz')
+        self.filename_token = self.token.gen_token(5)
         self.irc        = irc
         self.authorized = False
         self.id	= None
@@ -1028,30 +1031,25 @@
         if not self.download:
             return ''
         if filename:
-            idd_file = add_filename(filename, mid)
-            new_file = sanitize_filename(idd_file)
-            new_path = os.path.join(self.telegram_media_dir, new_file)
-            if os.path.exists(new_path):
-                local_path = new_path
+            aux_file = filename
+        else:
+            if hasattr(message, 'file') and message.file is not None:
+                aux_file = self.filename_token + message.file.ext
             else:
-                await self.notice_downloading(size, relay_attr)
-                local_path = await message.download_media(new_path)
-                if not local_path: return ''
+                aux_file = self.filename_token
+
+        idd_file = add_filename(aux_file, mid)
+        new_file = sanitize_filename(idd_file)
+        new_path = os.path.join(self.telegram_media_dir, new_file)
+        if os.path.exists(new_path) and (size == 0 or size == os.path.getsize(new_path)):
+            local_path = new_path
         else:
             await self.notice_downloading(size, relay_attr)
-            local_path = await message.download_media(self.telegram_media_dir)
+            local_path = await message.download_media(new_path)
             if not local_path: return ''
-            filetype = os.path.splitext(local_path)[1]
-            gen_file = str(self.media_cn) + filetype
-            idd_file = add_filename(gen_file, mid)
-            new_file = sanitize_filename(idd_file)
-            self.media_cn += 1
-            new_path = os.path.join(self.telegram_media_dir, new_file)
 
         if local_path != new_path:
             os.replace(local_path, new_path)
-        if self.media_url[-1:] != '/':
-            self.media_url += '/'
         return self.media_url + new_file
 
     async def notice_downloading(self, size, relay_attr):
diff -rN -u old-irgramd/utils.py new-irgramd/utils.py
--- old-irgramd/utils.py	2026-06-09 16:28:16.940707302 +0200
+++ new-irgramd/utils.py	2026-06-09 16:28:16.940707302 +0200
@@ -14,10 +14,11 @@
 import zoneinfo
 import difflib
 import logging
+import random
 
 # Constants
 
-FILENAME_INVALID_CHARS = re.compile('[/{}<>()"\'\\|&#%?]')
+FILENAME_INVALID_CHARS = re.compile('[\0-\x1F/{}<>"\'\\|*&#%?\x7F]')
 SIMPLE_URL = re.compile('http(|s)://[^ ]+')
 
 from include import MAX_LINE
@@ -86,22 +87,23 @@
     return messages_limited
 
 def sanitize_filename(fn):
-    cn = str(sanitize_filename.cn)
-    new_fn, ns = FILENAME_INVALID_CHARS.subn(cn, fn)
-    if ns:
-        sanitize_filename.cn += 1
-    return new_fn.strip('-').replace(' ','_')
-sanitize_filename.cn = 0
+    def hexize(m):
+        return '-{:x}-'.format(ord(m.group(0)))
+
+    new_fn = FILENAME_INVALID_CHARS.sub(hexize, fn)
+    return new_fn.lstrip('-').replace(' ','_')
 
 def add_filename(filename, add):
     if add:
         aux = filename.rsplit('.', 1)
         name = aux[0]
+        last_dot = '.'
         try:
             ext = aux[1]
         except:
             ext = ''
-        return '{}-{}.{}'.format(name, add, ext)
+            last_dot = ''
+        return '{}-{}{}{}'.format(name, add, last_dot, ext)
     else:
         return filename
 
@@ -240,3 +242,15 @@
 
 def pretty(object):
     return object.stringify() if LOGL.debug and object else object
+
+class token:
+    def __init__(self, alpha):
+        self.alpha = alpha
+        self.long_alpha = len(alpha)
+
+    def gen_token(self, long_token):
+        if long_token == 1:
+            return self.alpha[random.randrange(self.long_alpha)]
+        else:
+            aux = self.gen_token(long_token - 1)
+            return aux + self.alpha[random.randrange(self.long_alpha)]