#95, #172: BBC: Arguments changes on 'Documents' constructors: Remove 'signature', introduce 'signing_key', make 'currency' and 'version' optionals

Break backward compatibilities!

• Remove useless signature argument from Documents.__init__()
  • Rename Identity(ts: BlockUID) by Identity(timestamp: BlockUID)
• Refactor Document.signatures (List) as Document.signature (str)
  • Transaction can have multiple signatures, with Transaction.signatures attribute and Transaction.multi_sign([keys]) method.
  • Move signatures verifications in the Documents classes
• Add optional signing_key argument in Document sub-classes
• Refactor subclass version argument as optional with default=subclass.VERSION
• Set time argument optional in SimpleTransaction
• Refactor Documents currency arguments as optional with default=constants.CURRENCY_CODENAME_G1

Close #95 (closed), #172 (closed).

duniterpy/documents/ws2p/heads.py

@@ -12,7 +12,6 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
 import re
 
 import attr
@@ -26,6 +25,7 @@ from ...constants import (
     WS2P_PUBLIC_PREFIX_REGEX,
     WS2PID_REGEX,
 )
+from ...key import VerifyingKey
 from ..block_uid import BlockUID
 from ..document import MalformedDocumentError
 
@@ -126,6 +126,17 @@ class HeadV0(Head):
         )
         return "{0}:{1}".format(str(self.api), ":".join(values))
 
+    def check_signature(self, pubkey: str) -> bool:
+        """
+        Check if Head signature is from head pubkey
+
+        :param pubkey: Pubkey to check signature upon
+        :return:
+        """
+        verifying_key = VerifyingKey(pubkey)
+
+        return verifying_key.check_signature(self.inline(), self.signature)
+
 
 @attr.s()
 class HeadV1(HeadV0):