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dist/ba_data/python/efro/json.py

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+# Released under the MIT License. See LICENSE for details.
+#
+"""Custom json compressor/decompressor with support for more data times/etc."""
+
+from __future__ import annotations
+
+import datetime
+import json
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import Any
+
+# Special attr we included for our extended type information
+# (extended-json-type)
+TYPE_TAG = '_xjtp'
+
+_pytz_utc: Any
+
+# We don't *require* pytz since it must be installed through pip
+# but it is used by firestore client for its utc tzinfos.
+# (in which case it should be installed as a dependency anyway)
+try:
+    import pytz
+    _pytz_utc = pytz.utc
+except ModuleNotFoundError:
+    _pytz_utc = None  # pylint: disable=invalid-name
+
+
+class ExtendedJSONEncoder(json.JSONEncoder):
+    """Custom json encoder supporting additional types."""
+
+    def default(self, obj: Any) -> Any:  # pylint: disable=W0221
+        if isinstance(obj, datetime.datetime):
+
+            # We only support timezone-aware utc times.
+            if (obj.tzinfo is not datetime.timezone.utc
+                    and (_pytz_utc is None or obj.tzinfo is not _pytz_utc)):
+                raise ValueError(
+                    'datetime values must have timezone set as timezone.utc')
+            return {
+                TYPE_TAG:
+                    'dt',
+                'v': [
+                    obj.year, obj.month, obj.day, obj.hour, obj.minute,
+                    obj.second, obj.microsecond
+                ],
+            }
+        return super().default(obj)
+
+
+class ExtendedJSONDecoder(json.JSONDecoder):
+    """Custom json decoder supporting extended types."""
+
+    def __init__(self, *args: Any, **kwargs: Any):
+        json.JSONDecoder.__init__(self,
+                                  object_hook=self.object_hook,
+                                  *args,
+                                  **kwargs)
+
+    def object_hook(self, obj: Any) -> Any:  # pylint: disable=E0202
+        """Custom hook."""
+        if TYPE_TAG not in obj:
+            return obj
+        objtype = obj[TYPE_TAG]
+        if objtype == 'dt':
+            vals = obj.get('v', [])
+            if len(vals) != 7:
+                raise ValueError('malformed datetime value')
+            return datetime.datetime(  # type: ignore
+                *vals, tzinfo=datetime.timezone.utc)
+        return obj