games: Use Python's JSON module

cartridges/__init__.py

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # SPDX-FileCopyrightText: Copyright 2025 Zoey Ahmed
+# SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
 
 import gettext
 import locale
@@ -12,13 +13,14 @@ import gi
 gi.require_versions({
     "Gtk": "4.0",
     "Adw": "1",
-    "Json": "1.0",
 })
 
-from gi.repository import Gio
+from gi.repository import Gio, GLib
 
 from .config import LOCALEDIR, PKGDATADIR
 
+DATA_DIR = Path(GLib.get_user_data_dir(), "cartridges")
+
 _RESOURCES = ("data", "icons", "ui")
 
 signal.signal(signal.SIGINT, signal.SIG_DFL)

cartridges/games.py

@@ -1,22 +1,35 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # SPDX-FileCopyrightText: Copyright 2025 Zoey Ahmed
 # SPDX-FileCopyrightText: Copyright 2025 kramo
+# SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
 
+import json
 from collections.abc import Generator
-from pathlib import Path
-from typing import cast
+from json import JSONDecodeError
+from types import UnionType
+from typing import Any
 
-from gi.repository import (
-    Gdk,
-    Gio,
-    GLib,
-    GObject,
-    Json,  # pyright: ignore[reportAttributeAccessIssue]
-)
+from gi.repository import Gdk, Gio, GLib, GObject
 
-DATA_DIR = Path(GLib.get_user_data_dir(), "cartridges")
-GAMES_DIR = DATA_DIR / "games"
-COVERS_DIR = DATA_DIR / "covers"
+from cartridges import DATA_DIR
+
+_GAMES_DIR = DATA_DIR / "games"
+_COVERS_DIR = DATA_DIR / "covers"
+
+_SPEC_VERSION = 2.0
+_PROPERTIES: dict[str, tuple[type | UnionType, bool]] = {
+    "added": (int, False),
+    "executable": (str | list[str], True),
+    "game_id": (str, True),
+    "source": (str, True),
+    "hidden": (bool, False),
+    "last_played": (int, False),
+    "name": (str, True),
+    "developer": (str, False),
+    "removed": (bool, False),
+    "blacklisted": (bool, False),
+    "version": (float, False),
+}
 
 
 class Game(GObject.Object):
@@ -29,30 +42,52 @@ class Game(GObject.Object):
     game_id = GObject.Property(type=str)
     source = GObject.Property(type=str)
     hidden = GObject.Property(type=bool, default=False)
-    last_played = GObject.Property(type=int, default=0)
+    last_played = GObject.Property(type=int)
     name = GObject.Property(type=str)
     developer = GObject.Property(type=str)
     removed = GObject.Property(type=bool, default=False)
     blacklisted = GObject.Property(type=bool, default=False)
-    version = GObject.Property(type=float, default=2.0)
+    version = GObject.Property(type=float, default=_SPEC_VERSION)
 
     cover = GObject.Property(type=Gdk.Texture)
 
+    def __init__(self, data: dict[str, Any]):
+        super().__init__()
 
-def load() -> Generator[Game]:
-    """Load the user's games from disk."""
-    for path in GAMES_DIR.glob("*.json"):
+        for name, (type_, required) in _PROPERTIES.items():
+            value = data.get(name)
+
+            if not required and value is None:
+                continue
+
+            if not isinstance(value, type_):
+                raise TypeError
+
+            match name:
+                case "executable" if isinstance(value, list):
+                    value = " ".join(value)
+                case "version" if value and value > _SPEC_VERSION:
+                    raise TypeError
+                case "version":
+                    continue
+
+            setattr(self, name, value)
+
+
+def _load() -> Generator[Game]:
+    for path in _GAMES_DIR.glob("*.json"):
         try:
-            data = path.read_text("utf-8")
-        except UnicodeError:
+            with path.open(encoding="utf-8") as f:
+                data = json.load(f)
+        except (JSONDecodeError, UnicodeDecodeError):
             continue
 
         try:
-            game = cast(Game, Json.gobject_from_data(Game, data, len(data)))
-        except GLib.Error:
+            game = Game(data)
+        except TypeError:
             continue
 
-        cover_path = COVERS_DIR / game.game_id
+        cover_path = _COVERS_DIR / game.game_id
         for ext in ".gif", ".tiff":
             filename = str(cover_path.with_suffix(ext))
             try:
@@ -66,4 +101,4 @@ def load() -> Generator[Game]:
 
 
 model = Gio.ListStore.new(Game)
-model.splice(0, 0, tuple(load()))
+model.splice(0, 0, tuple(_load()))