i18n: refine Slovak linked nodes and localize validation errors

AppImage/scripts/monitor_links.py

@@ -39,7 +39,10 @@ _refresh_lock = threading.Lock()
 
 
 class LinkError(ValueError):
-    pass
+    def __init__(self, message, *, code="monitor_links_save_failed", params=None):
+        super().__init__(message)
+        self.code = code
+        self.params = params
 
 
 def _load():
@@ -63,19 +66,19 @@ def _save(data):
 def normalize_url(value):
     """Return the origin of an http(s) address, or raise LinkError."""
     if not isinstance(value, str) or not value.strip():
-        raise LinkError("Enter the address of the Monitor.")
+        raise LinkError("Enter the address of the Monitor.", code="monitor_link_address_required")
     text = value.strip()
     if "://" not in text:
         text = "https://" + text
     parsed = urllib.parse.urlsplit(text)
     if parsed.scheme not in ("http", "https") or not parsed.hostname:
-        raise LinkError("The address must start with http:// or https:// and name a host.")
+        raise LinkError("The address must start with http:// or https:// and name a host.", code="monitor_link_invalid_address")
     if parsed.username or parsed.password:
-        raise LinkError("The address must not contain a user or password.")
+        raise LinkError("The address must not contain a user or password.", code="monitor_link_address_credentials")
     try:
         port = parsed.port
     except ValueError as exc:
-        raise LinkError("The port of the address is not valid.") from exc
+        raise LinkError("The port of the address is not valid.", code="monitor_link_invalid_port") from exc
     host = parsed.hostname
     if ":" in host:
         host = f"[{host}]"
@@ -301,16 +304,16 @@ def start_prewarmer():
 
 def add_link(payload):
     if not isinstance(payload, dict):
-        raise LinkError("Invalid request.")
+        raise LinkError("Invalid request.", code="monitor_link_invalid_request")
     name = str(payload.get("name") or "").strip()[:64]
     url = normalize_url(payload.get("url"))
     product = payload.get("product") if payload.get("product") in PRODUCTS else "pve"
     with _lock:
         data = _load()
         if len(data["manual"]) >= MAX_MANUAL:
-            raise LinkError(f"At most {MAX_MANUAL} nodes can be added.")
+            raise LinkError(f"At most {MAX_MANUAL} nodes can be added.", code="monitor_link_limit", params={"count": MAX_MANUAL})
         if any(row.get("url") == url for row in data["manual"]):
-            raise LinkError("This address is already in the list.")
+            raise LinkError("This address is already in the list.", code="monitor_link_duplicate")
         identifier = secrets.token_hex(6)
         data["manual"].append({"id": identifier, "name": name or urllib.parse.urlsplit(url).hostname,
                                "url": url, "product": product})
@@ -320,13 +323,13 @@ def add_link(payload):
 
 def update_link(key, payload):
     if not isinstance(payload, dict):
-        raise LinkError("Invalid request.")
+        raise LinkError("Invalid request.", code="monitor_link_invalid_request")
     with _lock:
         data = _load()
         if key.startswith("manual:"):
             row = next((r for r in data["manual"] if f"manual:{r.get('id')}" == key), None)
             if row is None:
-                raise LinkError("Node not found.")
+                raise LinkError("Node not found.", code="monitor_link_not_found")
             if "name" in payload:
                 row["name"] = str(payload["name"] or "").strip()[:64] or row["name"]
             if payload.get("url"):
@@ -345,7 +348,7 @@ def update_link(key, payload):
             if not override:
                 data["overrides"].pop(key, None)
         else:
-            raise LinkError("Node not found.")
+            raise LinkError("Node not found.", code="monitor_link_not_found")
         _save(data)
 
 
@@ -354,6 +357,6 @@ def delete_link(key):
         data = _load()
         remaining = [r for r in data["manual"] if f"manual:{r.get('id')}" != key]
         if len(remaining) == len(data["manual"]):
-            raise LinkError("Only nodes added by hand can be removed; detected ones can be hidden.")
+            raise LinkError("Only nodes added by hand can be removed; detected ones can be hidden.", code="monitor_link_detected_remove")
         data["manual"] = remaining
         _save(data)