add finders

bot/utils.py

@@ -0,0 +1,32 @@
+def is_instagram_story_url(url: str) -> bool:
+    return "instagram.com/stories" in url
+
+VIDEO_SUFFIXES = ('.mp4', '.mov', '.mkv')
+IMAGE_SUFFIXES = ('.jpg', '.jpeg', '.png', '.webp')
+
+def extract_instagram_username(url: str) -> str | None:
+    # Поддержка:
+    # https://www.instagram.com/stories/USERNAME/...
+    # https://www.instagram.com/USERNAME/
+    try:
+        base = url.split("?")[0].strip("/")
+        parts = base.split("/")
+        if "instagram.com" not in url:
+            return None
+        if "stories" in parts:
+            i = parts.index("stories")
+            if i + 1 < len(parts):
+                return parts[i + 1]
+        # профиль
+        host_idx = 0
+        for i, p in enumerate(parts):
+            if "instagram.com" in p:
+                host_idx = i
+                break
+        if host_idx + 1 < len(parts):
+            candidate = parts[host_idx + 1]
+            if candidate and candidate not in ("stories", "reel", "p", "tv"):
+                return candidate
+    except Exception:
+        return None
+    return None