Handle transaction schema validation errors

in POST /transactions

bigchaindb/web/views/transactions.py

@@ -6,7 +6,11 @@ For more information please refer to the documentation on ReadTheDocs:
 from flask import current_app, request, Blueprint
 from flask_restful import Resource, Api
 
-from bigchaindb.common.exceptions import ValidationError, InvalidSignature
+from bigchaindb.common.exceptions import (
+    ValidationError,
+    InvalidSignature,
+    SchemaValidationError,
+)
 
 import bigchaindb
 from bigchaindb.models import Transaction
@@ -98,6 +102,12 @@ class TransactionListApi(Resource):
 
         try:
             tx_obj = Transaction.from_dict(tx)
+        except SchemaValidationError as e:
+            return make_error(
+                400,
+                message='Invalid transaction schema: {}'.format(
+                    e.__cause__.message)
+            )
         except (ValidationError, InvalidSignature):
             return make_error(400, 'Invalid transaction')
 

tests/web/test_transactions.py

@@ -66,6 +66,18 @@ def test_post_create_transaction_with_invalid_structure(client):
     assert res.status_code == 400
 
 
+def test_post_create_transaction_with_invalid_schema(client):
+    from bigchaindb.models import Transaction
+    user_priv, user_pub = crypto.generate_key_pair()
+    tx = Transaction.create(
+        [user_pub], [([user_pub], 1)]).sign([user_priv]).to_dict()
+    del tx['version']
+    res = client.post(TX_ENDPOINT, data=json.dumps(tx))
+    assert res.status_code == 400
+    assert res.json['message'] == (
+        "Invalid transaction schema: 'version' is a required property")
+
+
 @pytest.mark.usefixtures('inputs')
 def test_post_transfer_transaction_endpoint(b, client, user_pk, user_sk):
     sk, pk = crypto.generate_key_pair()