Add object and chunk base impl and test cases

src/knowledge/object/object_id.py

@@ -0,0 +1,53 @@
+# define a object type enum
+from abc import ABC, abstractmethod
+from enum import Enum
+from .hash import HashValue
+import base58
+import base36
+
+
+class ObjectType(Enum):
+    Chunk = 7
+    TextChunk = 100
+    Image = 101
+    Email = 102
+
+
+# define a object ID class to identify a object
+class ObjectID:  # pylint: disable=too-few-public-methods
+    def __init__(self, object_type: ObjectType, value: bytes):
+        assert len(value) == 32, "ObjectID must be 32 bytes long"
+        self.object_type = object_type
+        self.value = value
+
+    def __str__(self):
+        return self.to_base58()
+
+    def get_object_type(self):
+        return self.object_type
+    
+    def to_base58(self):
+        return base58.b58encode(self.value).decode()
+
+    @staticmethod
+    def from_base58(s):
+        return ObjectID(base58.b58decode(s))
+
+    def to_base36(self):
+        # Convert the bytes to int before encoding
+        num = int.from_bytes(self.value, "big")
+        return base36.dumps(num)
+
+    @staticmethod
+    def from_base36(s):
+        # Decode to int and then convert to bytes
+        num = base36.loads(s)
+        return ObjectID(num.to_bytes((num.bit_length() + 7) // 8, "big"))
+
+    @staticmethod
+    def new_chunk_id(chunk_hash: HashValue):
+        return ObjectID(ObjectType.Chunk, chunk_hash.value)
+    
+    @staticmethod
+    def hash_data(data: bytes):
+        return ObjectID.new_chunk_id(HashValue.hash_data(data))