2 files changed, 51 insertions, 0 deletions
diff --git a/pyapd/objects.py b/pyapd/objects.py
new file mode 100644
index 0000000..19aa65f
--- /dev/null
+++ b/pyapd/objects.py
@@ -0,0 +1,29 @@
+import json
+
+
+class ActivityObject():
+    PROPERTIES = [
+        'id',
+        'type',
+        ]
+
+    def __init__(self, *args, **kw):
+        self.context = "https://www.w3.org/ns/activitystreams"
+        for p in self.PROPERTIES:
+            if p in kw:
+                setattr(self, p, kw[p])
+
+    @classmethod
+    def from_jsons(cls, data: str):
+        return cls(**json.loads(data))
+
+    def to_jsonable(self):
+        data = {}
+        for p in self.PROPERTIES:
+            v = getattr(self, p, None)
+            if v is not None:
+                data[p] = v
+        return data
+
+    def to_jsons(self):
+        return json.dumps(self.to_jsonable())
diff --git a/tests/test_objects.py b/tests/test_objects.py
new file mode 100644
index 0000000..9646269
--- /dev/null
+++ b/tests/test_objects.py
@@ -0,0 +1,22 @@
+import unittest
+
+from pyapd import objects
+
+
+class TestObjects(unittest.TestCase):
+
+    def test_activity_from_json(self):
+        act = objects.ActivityObject.from_jsons('''{
+            "id": "http://example.org/123456"
+            }''')
+        self.assertIsInstance(act, objects.ActivityObject)
+        self.assertEqual(act.id, 'http://example.org/123456')
+
+    def test_activity_to_json(self):
+        act = objects.ActivityObject(
+            id="http://example.org/123456"
+            )
+        data = act.to_jsons()
+        self.assertIsInstance(data, str)
+        self.assertIn('"id": "http://example.org/123456"', data)
+