feat(bundle): add stream signing support for large files

tests/test_stream_signing.py

@@ -0,0 +1,323 @@
+"""
+Unit tests for stream signing functionality.
+
+Tests verify that stream signing produces identical results to in-memory signing
+and that progress callbacks work correctly.
+"""
+
+import io
+import pytest
+from turbo_sdk.bundle import create_data, sign, encode_tags
+from turbo_sdk.bundle.sign import (
+    deep_hash,
+    deep_hash_blob_stream,
+    get_signature_data,
+    get_signature_data_stream,
+    sign_stream,
+    DEFAULT_STREAM_CHUNK_SIZE,
+)
+from turbo_sdk.signers import EthereumSigner
+
+
+# Test private key (not a real key, just for testing)
+TEST_PRIVATE_KEY = "0x" + "ab" * 32
+
+
+class TestDeepHashBlobStream:
+    """Tests for deep_hash_blob_stream function."""
+
+    def test_matches_in_memory_deep_hash(self):
+        """Stream hash should match in-memory hash for same data."""
+        test_data = b"Hello, this is test data for streaming hash verification!" * 100
+        stream = io.BytesIO(test_data)
+
+        in_memory_hash = deep_hash(test_data)
+        stream_hash = deep_hash_blob_stream(stream, len(test_data))
+
+        assert in_memory_hash == stream_hash
+
+    def test_empty_data(self):
+        """Should handle empty data correctly."""
+        test_data = b""
+        stream = io.BytesIO(test_data)
+
+        in_memory_hash = deep_hash(test_data)
+        stream_hash = deep_hash_blob_stream(stream, len(test_data))
+
+        assert in_memory_hash == stream_hash
+
+    def test_single_byte(self):
+        """Should handle single byte data."""
+        test_data = b"x"
+        stream = io.BytesIO(test_data)
+
+        in_memory_hash = deep_hash(test_data)
+        stream_hash = deep_hash_blob_stream(stream, len(test_data))
+
+        assert in_memory_hash == stream_hash
+
+    def test_large_data(self):
+        """Should handle data larger than chunk size."""
+        # Create data larger than default chunk size (256 KiB)
+        test_data = b"x" * (DEFAULT_STREAM_CHUNK_SIZE * 3 + 1000)
+        stream = io.BytesIO(test_data)
+
+        in_memory_hash = deep_hash(test_data)
+        stream_hash = deep_hash_blob_stream(stream, len(test_data))
+
+        assert in_memory_hash == stream_hash
+
+    def test_custom_chunk_size(self):
+        """Should work with custom chunk sizes."""
+        test_data = b"Test data for custom chunk size" * 100
+        stream = io.BytesIO(test_data)
+
+        in_memory_hash = deep_hash(test_data)
+        stream_hash = deep_hash_blob_stream(stream, len(test_data), chunk_size=64)
+
+        assert in_memory_hash == stream_hash
+
+    def test_progress_callback_called(self):
+        """Progress callback should be called during hashing."""
+        test_data = b"x" * 5000
+        stream = io.BytesIO(test_data)
+        progress_calls = []
+
+        def on_progress(processed, total):
+            progress_calls.append((processed, total))
+
+        deep_hash_blob_stream(stream, len(test_data), chunk_size=1024, on_progress=on_progress)
+
+        assert len(progress_calls) > 0
+        assert progress_calls[-1] == (len(test_data), len(test_data))
+
+    def test_progress_callback_increments(self):
+        """Progress should increment correctly."""
+        test_data = b"x" * 3000
+        stream = io.BytesIO(test_data)
+        progress_calls = []
+
+        def on_progress(processed, total):
+            progress_calls.append((processed, total))
+
+        deep_hash_blob_stream(stream, len(test_data), chunk_size=1000, on_progress=on_progress)
+
+        # Should have 3 calls for 3000 bytes with 1000 byte chunks
+        assert len(progress_calls) == 3
+        assert progress_calls[0] == (1000, 3000)
+        assert progress_calls[1] == (2000, 3000)
+        assert progress_calls[2] == (3000, 3000)
+
+    def test_raises_on_premature_stream_end(self):
+        """Should raise error if stream ends before expected size."""
+        test_data = b"short"
+        stream = io.BytesIO(test_data)
+
+        with pytest.raises(ValueError, match="Stream ended prematurely"):
+            deep_hash_blob_stream(stream, len(test_data) + 100)
+
+
+class TestGetSignatureDataStream:
+    """Tests for get_signature_data_stream function."""
+
+    def test_matches_in_memory_signature_data(self):
+        """Stream signature data should match in-memory version."""
+        sig_type = 3  # Ethereum
+        raw_owner = b"x" * 65
+        raw_target = b""
+        raw_anchor = b"a" * 32
+        raw_tags = b""
+        data = b"Test payload data" * 500
+
+        # Create mock dataitem for in-memory comparison
+        class MockDataItem:
+            signature_type = sig_type
+            raw_owner = b"x" * 65
+            raw_target = b""
+            raw_anchor = b"a" * 32
+            raw_tags = b""
+            raw_data = data
+
+        mock_item = MockDataItem()
+        in_memory_hash = get_signature_data(mock_item)
+
+        data_stream = io.BytesIO(data)
+        stream_hash = get_signature_data_stream(
+            signature_type=sig_type,
+            raw_owner=raw_owner,
+            raw_target=raw_target,
+            raw_anchor=raw_anchor,
+            raw_tags=raw_tags,
+            data_stream=data_stream,
+            data_size=len(data),
+        )
+
+        assert in_memory_hash == stream_hash
+
+    def test_with_tags(self):
+        """Should work correctly with encoded tags."""
+        sig_type = 3
+        raw_owner = b"x" * 65
+        raw_target = b""
+        raw_anchor = b"a" * 32
+        raw_tags = encode_tags([{"name": "Content-Type", "value": "text/plain"}])
+        data = b"Data with tags"
+
+        class MockDataItem:
+            signature_type = sig_type
+            raw_owner = b"x" * 65
+            raw_target = b""
+            raw_anchor = b"a" * 32
+            raw_tags = encode_tags([{"name": "Content-Type", "value": "text/plain"}])
+            raw_data = data
+
+        mock_item = MockDataItem()
+        in_memory_hash = get_signature_data(mock_item)
+
+        data_stream = io.BytesIO(data)
+        stream_hash = get_signature_data_stream(
+            signature_type=sig_type,
+            raw_owner=raw_owner,
+            raw_target=raw_target,
+            raw_anchor=raw_anchor,
+            raw_tags=raw_tags,
+            data_stream=data_stream,
+            data_size=len(data),
+        )
+
+        assert in_memory_hash == stream_hash
+
+    def test_with_target(self):
+        """Should work correctly with target address."""
+        sig_type = 3
+        raw_owner = b"x" * 65
+        raw_target = b"t" * 32  # 32-byte target
+        raw_anchor = b"a" * 32
+        raw_tags = b""
+        data = b"Data with target"
+
+        class MockDataItem:
+            signature_type = sig_type
+            raw_owner = b"x" * 65
+            raw_target = b"t" * 32
+            raw_anchor = b"a" * 32
+            raw_tags = b""
+            raw_data = data
+
+        mock_item = MockDataItem()
+        in_memory_hash = get_signature_data(mock_item)
+
+        data_stream = io.BytesIO(data)
+        stream_hash = get_signature_data_stream(
+            signature_type=sig_type,
+            raw_owner=raw_owner,
+            raw_target=raw_target,
+            raw_anchor=raw_anchor,
+            raw_tags=raw_tags,
+            data_stream=data_stream,
+            data_size=len(data),
+        )
+
+        assert in_memory_hash == stream_hash
+
+
+class TestSignStream:
+    """Tests for sign_stream function."""
+
+    @pytest.fixture
+    def signer(self):
+        """Create a real Ethereum signer for testing."""
+        return EthereumSigner(TEST_PRIVATE_KEY)
+
+    def test_matches_in_memory_sign(self, signer):
+        """Stream signing should produce identical signature to in-memory signing."""
+        test_data = b"Hello Arweave! " * 1000
+        tags = [{"name": "Content-Type", "value": "text/plain"}]
+
+        # In-memory signing via DataItem
+        data_item = create_data(bytearray(test_data), signer, tags)
+        sign(data_item, signer)
+        in_memory_signature = data_item.raw_signature
+
+        # Stream signing
+        encoded_tags = encode_tags(tags)
+        stream = io.BytesIO(test_data)
+
+        stream_signature = sign_stream(
+            signature_type=signer.signature_type,
+            raw_owner=signer.public_key,
+            raw_target=b"",
+            raw_anchor=data_item.raw_anchor,  # Use same anchor
+            raw_tags=encoded_tags,
+            data_stream=stream,
+            data_size=len(test_data),
+            signer=signer,
+        )
+
+        assert in_memory_signature == stream_signature
+
+    def test_with_progress_callback(self, signer):
+        """Progress callback should work during stream signing."""
+        test_data = b"x" * 10000
+        progress_calls = []
+
+        def on_progress(processed, total):
+            progress_calls.append((processed, total))
+
+        stream = io.BytesIO(test_data)
+
+        sign_stream(
+            signature_type=signer.signature_type,
+            raw_owner=signer.public_key,
+            raw_target=b"",
+            raw_anchor=b"a" * 32,
+            raw_tags=b"",
+            data_stream=stream,
+            data_size=len(test_data),
+            signer=signer,
+            chunk_size=1000,
+            on_progress=on_progress,
+        )
+
+        assert len(progress_calls) == 10
+        assert progress_calls[-1] == (10000, 10000)
+
+    def test_different_data_produces_different_signature(self, signer):
+        """Different data should produce different signatures."""
+        data1 = b"First data payload"
+        data2 = b"Second data payload"
+        anchor = b"a" * 32
+
+        stream1 = io.BytesIO(data1)
+        sig1 = sign_stream(
+            signature_type=signer.signature_type,
+            raw_owner=signer.public_key,
+            raw_target=b"",
+            raw_anchor=anchor,
+            raw_tags=b"",
+            data_stream=stream1,
+            data_size=len(data1),
+            signer=signer,
+        )
+
+        stream2 = io.BytesIO(data2)
+        sig2 = sign_stream(
+            signature_type=signer.signature_type,
+            raw_owner=signer.public_key,
+            raw_target=b"",
+            raw_anchor=anchor,
+            raw_tags=b"",
+            data_stream=stream2,
+            data_size=len(data2),
+            signer=signer,
+        )
+
+        assert sig1 != sig2
+
+
+class TestDefaultChunkSize:
+    """Tests for default chunk size constant."""
+
+    def test_default_chunk_size_is_256_kib(self):
+        """Default chunk size should be 256 KiB to match Arweave."""
+        assert DEFAULT_STREAM_CHUNK_SIZE == 256 * 1024

turbo_sdk/bundle/__init__.py

@@ -1,7 +1,15 @@
 from .constants import SIG_CONFIG, MAX_TAG_BYTES, MIN_BINARY_SIZE
 from .dataitem import DataItem
 from .create import create_data
-from .sign import sign, deep_hash, get_signature_data
+from .sign import (
+    sign,
+    deep_hash,
+    get_signature_data,
+    sign_stream,
+    get_signature_data_stream,
+    deep_hash_blob_stream,
+    DEFAULT_STREAM_CHUNK_SIZE,
+)
 from .tags import encode_tags, decode_tags
 from .utils import set_bytes, byte_array_to_long
 
@@ -14,6 +22,10 @@
     "sign",
     "deep_hash",
     "get_signature_data",
+    "sign_stream",
+    "get_signature_data_stream",
+    "deep_hash_blob_stream",
+    "DEFAULT_STREAM_CHUNK_SIZE",
     "encode_tags",
     "decode_tags",
     "set_bytes",